<p class="MsoNormal" style="margin: 0cm 0cm 0pt; text-align: center;" align="center"><strong style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt; font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">納米二氧化鈦</span></strong><strong style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt;" lang="EN-US"> VK-T02</span></strong><strong style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt; font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">用在化妝品中，具有很好的防曬效果</span></strong><strong style="mso-bidi-font-weight: normal;"><span style="font-size: 14pt;" lang="EN-US"></span></strong></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">紫外線是太陽光中對人體危害非常大的一種光波。過度照射紫外線</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">會使外表產(chǎn)生紅斑、黑斑</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">使外表老化</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">嚴重的會引發(fā)外表癌。近年來</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">隨著人們對紫外線認識的提高及保持健康意識的增強</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">防曬型化妝品的開發(fā)、應(yīng)用逐漸成為一個科研熱點。納米二氧化鈦</span><span lang="EN-US"> VK-T02</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">由于具有高折光性和高光活性</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">一直被作為一種主要的防曬劑。納米二氧化鈦</span><span lang="EN-US"> VK-T02</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">因有著更為優(yōu)越的性能而被廣泛重視</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">被用于新型、防曬化妝品的研究和開發(fā)</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">逐步顯示其特殊的優(yōu)越性和廣闊的應(yīng)用前景。</span><span lang="EN-US"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span lang="EN-US">1 </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　納米二氧化鈦納米二氧化鈦</span><span lang="EN-US"> VK-T02</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">的防曬機理</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　　按照波長的不同</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">紫外線分為短波區(qū)</span><span lang="EN-US">190</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">～</span><span lang="EN-US">280 nm</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">、中波區(qū)</span><span lang="EN-US">280</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">～</span><span lang="EN-US">320 nm</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">、長波區(qū)</span><span lang="EN-US">320</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">～</span><span lang="EN-US">400nm</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">。短波區(qū)紫外線能量較高</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">但在經(jīng)過離臭氧層時被阻擋</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">因此</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">對人體傷害的一般是中波區(qū)和長波區(qū)紫外線。</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　　納米二氧化鈦</span><span lang="EN-US"> VK-T02</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">的強預(yù)防光線直射能力是由于其具有高折光性和高光活性。其預(yù)防光線直射能力及其機理與其粒徑有關(guān)</span><span lang="EN-US">:</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">當粒徑非常大時</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">對紫外線的阻隔是以反射、散射為主</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">且對中波區(qū)和長波區(qū)紫外線均有效。防曬機理是簡單的遮蓋</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">屬一般的物理防曬</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">防曬能力較弱</span><span lang="EN-US">;</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">隨著粒徑的減小</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">光線能透過納米二氧化鈦</span><span lang="EN-US"> VK-T02</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">的粒子面</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">對長波區(qū)紫外線的反射、散射性不明顯</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">而對中波區(qū)紫外線的吸收性明顯增強。其防曬機理是吸收紫外線</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">主要吸收中波區(qū)紫外線。</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　　由此可見</span><span lang="EN-US">, </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">納米二氧化鈦</span><span lang="EN-US"> VK-T02</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">對不同波長紫外線的防曬機理不一樣</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">對長波區(qū)紫外線的阻隔以散射為主</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">對中波區(qū)紫外線的阻隔以吸收為主。</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　　納米二氧化鈦</span><span lang="EN-US"> VK-T02</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">由于粒徑小</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">活性大</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">既能反射、散射紫外線</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">又能吸收紫外線</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">從而對紫外線有更強的阻隔能力。</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span lang="EN-US">2 </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　納米二氧化鈦</span><span lang="EN-US"> VK-T02</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">的防曬性能及應(yīng)用前景</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　　由于紫外線對人體有很大的危害性</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">發(fā)達國家近些年來比較重視防曬產(chǎn)品的研究、開發(fā)</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">相繼推出了多種多樣的抗紫外纖維、塑料、薄膜、涂料</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">以及防曬膏霜、粉底、口紅、摩絲、火局油膏等防曬化妝品。我國近年來也加大了防曬化裝品的研究和生產(chǎn)。</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　　但以往防曬劑多為二苯甲酮類、鄰氨基苯甲酮類、水楊酸酯類、對氨基苯甲酸類、肉桂酸酯類等農(nóng)業(yè)生產(chǎn)體系化合物</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">因而不穩(wěn)定、壽命短</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">并且副作用非常大</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">具有一定的毒性和發(fā)生反應(yīng)性</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">如果添加過量</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">會產(chǎn)生化學(xué)性過敏</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">甚至可能導(dǎo)致外表癌。</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　　而納米二氧化鈦</span><span lang="EN-US"> VK-T02</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">為無機成分</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">具有的化學(xué)穩(wěn)定性、熱穩(wěn)定性及非遷移性和較強的消色力、遮蓋力</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">較低的腐蝕性</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">良好的易分散性</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">并且無害、無味、無發(fā)生反應(yīng)性</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">使用安全</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">還兼有殺菌除臭的作用。更為重要的是</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">如前所述</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">納米二氧化鈦既能吸收紫外線</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">又能發(fā)射、散射紫外線</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">因此預(yù)防光線直射的能力強</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">與同樣劑量的農(nóng)業(yè)生產(chǎn)體系抗紫外劑相比</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">它在紫外區(qū)的吸收峰更高</span><span lang="EN-US">;</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">而且納米二氧化鈦對中波區(qū)和長波區(qū)紫外線均有阻隔作用</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">不象農(nóng)業(yè)生產(chǎn)體系抗紫外劑只是單一對中波區(qū)或長波區(qū)紫外線有屏蔽作用。特別是由于其顆粒較細</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">制成品透明度高</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">能透過可見光</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">加入化妝品使用時外表白度自然</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">克服了有的農(nóng)業(yè)生產(chǎn)體系物或顏料級二氧化鈦不透明</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">使外表呈現(xiàn)不自然的蒼白色的缺點。</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　　正因為如此</span><span lang="EN-US">, </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">納米二氧化鈦</span><span lang="EN-US"> VK-T02</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">很快被廣泛重視并逐步取代一些農(nóng)業(yè)生產(chǎn)體系抗紫外劑</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">成為當今防曬化妝品中性能優(yōu)越一種物理屏蔽型抗紫外劑。</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　　隨著人們生活水平的提高和全部競爭的加劇</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">安全、效率高防曬型化妝品的研究、開發(fā)力度將逐步加大。目前</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">發(fā)達國家的防曬型化妝品市場已顯現(xiàn)出強大的生命力。</span><span lang="EN-US">1999 </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">、</span><span lang="EN-US">2000 </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">年</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">美國的年銷售額已分別達</span><span lang="EN-US">7. 37 </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">、</span><span lang="EN-US">7. 65 </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">億美元</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">英國達</span><span lang="EN-US">2. 45 </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">、</span><span lang="EN-US">2. 70 </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">億美元</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">而且近年來分別以</span><span lang="EN-US">20 %</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">、</span><span lang="EN-US">10 %</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">以上的速度增長</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">其中納米二氧化鈦的用量也逐年大幅度增長。日本抗紫外化妝品中納米二氧化鈦的年需求量在</span><span lang="EN-US">1 000 t </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">以上</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">紡織、塑料、橡膠制品中的用量更大。</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　　從防曬化妝品的發(fā)展趨勢來看</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">一是無機防曬劑代替農(nóng)業(yè)生產(chǎn)體系防曬劑</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">二是仿生防曬。后者成本非常大</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">目前難以推廣</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">前者價格適中</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">且防曬性能優(yōu)越</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">因而被普遍看好。尤其是納米二氧化鈦</span><span lang="EN-US"> VK-T02,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">由于具有較為優(yōu)越的性能和應(yīng)用前景</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">因而發(fā)展勢頭和市場潛力較好。</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span lang="EN-US">3 </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　納米二氧化鈦</span><span lang="EN-US"> VK-T02</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">在防曬化妝品中的應(yīng)用選擇</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span lang="EN-US">3. 1 </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　晶型的選擇</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　　常用二氧化鈦屬正方晶體</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">其晶型有金紅石型及銳鈦礦型兩種</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">前者可通過后者煅燒制得</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">因而晶格結(jié)構(gòu)更完善</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">在熱力學(xué)上更為穩(wěn)定。</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　　從折光率來看</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">金紅石型為</span><span lang="EN-US">2. 7 ,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">銳鈦礦型為</span><span lang="EN-US">2. 3 ,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">因此</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">金紅石型對紫外線的發(fā)射、散射能力較強</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">而吸收力較弱。</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　　通過對其表面進行研究</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">結(jié)果發(fā)現(xiàn)</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">在有氧氣存在的情況下</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">金紅石型的光活性比銳鈦礦型的弱。這可能由于</span><span lang="EN-US">:1)</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">金紅石型產(chǎn)生電子</span><span lang="EN-US">2</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">空穴對速率較快</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">更容易以熱量或其它形式釋放光能</span><span lang="EN-US">;2) </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">金紅石型在熱處理時逐漸失水</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">減少了表面羥基</span><span lang="EN-US">;3) </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">金紅石型的氧氣交換能力較弱</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">較不易吸收氧氣。</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　　因此</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">從保持穩(wěn)定、增強屏蔽作用、減少二氧化鈦光活性、降低其光危害性的角度出發(fā)</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">在化妝品中應(yīng)盡量采用金紅石型二氧化鈦。</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span lang="EN-US">3. 2 </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　粒徑的選擇</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　　納米二氧化鈦</span><span lang="EN-US"> VK-T02</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">微粒的大小與其抗紫外能力密切相關(guān)。當其粒徑等于或小于光波波長的一半時</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">對光的反射、散射量非常大</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">屏蔽效果較好。紫外線的波長在</span><span lang="EN-US">190</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">～</span><span lang="EN-US">400 nm </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">之間</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">因此納米二氧化鈦</span><span lang="EN-US"> VK-T02</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">的粒徑不能大于</span><span lang="EN-US">200 nm , </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">較好不大于</span><span lang="EN-US">100nm</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">。但是</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">也不是顆粒越小越好</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">粒度太小容易團聚</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">不利于分散</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">還易于堵塞外表的毛孔</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">不利于透氣和汗液的排除。一般說來</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">當其粒徑在</span><span lang="EN-US">30</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">～</span><span lang="EN-US">100 nm </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">之間時</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">對紫外線的屏蔽效果較好</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">同時能透過可見光</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">使外表的白度顯得更富自然美。因此</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">較好設(shè)法將化妝品用二氧化鈦的大小控制在此范圍內(nèi)。</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"> </p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt;"><span style="font-size: small;"><span lang="EN-US">4 </span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">　結(jié)論</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt; text-indent: 21pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">納米二氧化鈦</span><span lang="EN-US"> VK-T02</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">由于有著較高的折光性和光活性</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">因而成為一種性能優(yōu)越的新型防曬劑</span><span lang="EN-US">,</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">在防曬化妝品的應(yīng)用中具有較好的發(fā)展前景。</span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt; text-indent: 21pt;"><span lang="EN-US"><span style="font-size: small;"> </span></span></p> <p class="MsoNormal" style="margin: 0cm 0cm 0pt; text-indent: 21pt;"><span style="font-size: small;"><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">杭州萬景新材料有限公司</span><span lang="EN-US"><span style="mso-spacerun: yes;">  </span></span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">李</span><span style="font-family: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">小姐</span><span lang="EN-US"><span style="mso-spacerun: yes;">  </span>0571-89969052</span></span></p>