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            <span id="ShoveWebControl_Text4"><div>　<span style="font-size: 14px;">　漆膜抵抗阳光、空气、水(酸雨)、微生物等环境破坏作用而保持原性能的能力,称为漆膜的耐候性。 由手漆膜与塑料等高分子材料一样,在使用过程中随着时间的推移,不可避免地会受到内在因素及外部环境因素的相互作用而出现变色,失光,粉化,开裂,生锈,剥落,斑点,沾污等一些不可逆的破坏现象。故对涂料的质量而言,除了应考察其外观、物理、化学、机械性能外,更为重要的应考察它的使用寿命,即漆膜本身的耐久性 。<br /></span></div><div><span style="font-size: 14px;">　　漆膜老化的成因<br /></span></div><div><span style="font-size: 14px;">　　2.1 &nbsp;漆膜老化的内在因素<br /></span></div><div><span style="font-size: 14px;">　　漆膜老化的内因一般与生产涂料用的树J指、固化剂、颜料、填料、助剂等原材料的类型及质量的优劣相关,还和涂料配方体系的配套性,合理性、成膜条件、涂装方式、底材的选择、处理方法等多种因素有着密不可分的关系。<font class="bjFfcClass"><font class="bjFfcClass">常</font></font>见的如:涂料用制量往往会在聚合过程中残留一些微量杂质或聚合物本身含有一些特殊的化学结构 。当涂料在使用时遇到紫外线的辐射作用时,假设该涂料树置旨的分子结构中含有一些紫外线吸收基团,则该树脂的这一老化缺陷会很容易凸现,由此产生光化学反应后造成漆膜表层降解也是不可避免的。 &nbsp;再如:常见的金红石型钛白粉颜料的晶格稳定、光化学活性较小,其抵抗紫外线辐射能力明显优于锐钦型钛白粉颜料。 说明了不同种颜料的光化学活性、色相、粒度、晶型是有差异的,而正是这诸多的差异会直接或间接影响漆膜的耐光性及耐粉化等耐老化性能。<br /></span></div><div><span style="font-size: 14px;">　　2.2 &nbsp;漆膜老化的外因<br /></span></div><div><span style="font-size: 14px;">　　漆膜老化的外因指户外环境造成的物理、化学、生物等多种破坏因素的组合。<br /></span></div><div><span style="font-size: 14px;">　　2.2.1 &nbsp;光:<br /></span></div><div><span style="font-size: 14px;">　　太阳光是造成户外使用的漆膜老化的一个主要外因之一 。 太阳光的光谱主要可分为紫外线、可见光、红外线三个区域。<br /></span></div><div><span style="font-size: 14px;">　　2.2.2 &nbsp;水<br /></span></div><div><span style="font-size: 14px;">　　在户外环境中,水对于漆膜的作用主要表现在降雨、潮湿、凝露等多种形式。漆膜长期保持在高湿条件下,尤其是凝露时形成的水膜,水分很容易会渗入漆膜内部 。 如果再加上阳光充分照射的情況,将更容易促使漆膜体系中某些水溶性物质、含亲水性基团的物质被水溶解、吸收从而改变漆膜的组成和比例,加速了漆膜的水降解 。 当水分到达金属底材表面后,水分与金属底材会产生电极反应,造成漆膜鼓出气泡及底材产生锈蚀等破坏。<br /></span></div><div><span style="font-size: 14px;">　　2.2.3 &nbsp;温度<br /></span></div><div><span style="font-size: 14px;">　　在户外环境下, 太阳光中的红外线被漆膜所吸收后转变为热能, 漆膜表面的温度会随之升高。 由子光化学反应总是随着温度的升高而加速的。 故在紫外线的作用下,热能产生的热化学反应使漆膜中聚合物分子链的断裂速率加快,造成漆膜表层降解并形成游离基,使漆膜变硬、变脆或发软、返粘。 较高的温度对漆膜中的顔料的破坏也较大,而当漆膜表面温度较高,通到降雨时, 又会造成一定的温差,这将引起漆膜各涂层之问及漆膜与底材之间发生膨胀和收缩,产生交变内应力 。 很容易使漆膜附着力下降后产生起泡、开製、粉化、剥落等漆膜老化破坏现象。(相关仪器：标准光源箱)<br /></span></div><div><span style="font-size: 14px;">　　2.2.4 &nbsp;氧<br /></span></div><div><span style="font-size: 14px;">　　空气中的氣在与阳光的相互作用下, 大大促进了漆膜中聚合物的光致氧化反应和热氧化反应的速度,漆膜由此会产生孔隙。微小的孔隙会造成漆膜抗沾污性能的下降,产生斑点。严重时会导致漆膜产生裂纹、剥落、变色、失光等破坏。<br /></span></div><div><span style="font-size: 14px;">　　2.2.5 &nbsp;综合因素<br /></span></div><div><span style="font-size: 14px;">　　同时出现多种破坏因素时产生的破坏力是由各种破坏因素相互作用叠加而形成的合力,其威力会远远超过単个因素的总和,即( 1+1 )大手2效应,通常称为综合破坏因素 。<br /></span></div><div><span style="font-size: 14px;">　　2.2.6 &nbsp;其它<br /></span></div><div><span style="font-size: 14px;">　　其他因素还有:臭氧、高能辐射、酸雨、霉菌等。<br /></span></div><div><span style="font-size: 14px;">　　我们公司的<strong>漆膜老化箱</strong>是一款以为光照为主做老化的设备，所以也可称为光照紫外老化试验箱，但它的功能还可以选择增加喷淋功能模拟下雨天气候及增加冷凝功能模拟湿热或者露珠气候，因为户外的气候是多样化的，通过人工重现自然气候中的紫外线、高温、高湿、凝露、雨淋等环境条件试验产品的耐老化性能。通过模拟自然阳光中的紫外辐射,再通过加湿系统模拟冷凝露珠功能，及通过喷淋模拟下雨天气对材料进行加速耐候性试验，以获得材料耐候性的结果。<br /></span></div></span>
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