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膜结构电动车车棚长时间使用发黄的原因是什么?
来源:http://www.sdcscp.com/ 发布时间:2021-09-06
人靠养 生,建筑也靠保养,这样才能长久使用。膜结构车 库也是日常生活中需要经常使用的一种膜结构。膜结构电动车棚项目建成后,大家都希望它的使用寿命更长,所以需要维修。但是膜结构电动车棚在使用过程中可能会变黄,那么这种情况下如何保养呢?为了防止膜结构电动车棚发黄,我们一定首先找出它的原因。下面小编就跟大家简单分享一下膜结构电动车棚泛黄的原因,希望对大家有所帮助。
People rely on health preservation and buildings rely on maintenance, so that they can be used for a long time. Membrane structure garage is also a membrane structure that needs to be often used in daily life. After the completion of the membrane structure electric vehicle shed project, everyone hopes that it will have a longer service life, so it needs maintenance. However, the membrane structure electric vehicle shed may turn yellow during use, so how to maintain it in this case? In order to prevent the yellowing of membrane structure electric vehicle shed, we must first find out the reason. The following small series will briefly share with you the reasons for the yellowing of membrane structure electric shed, hoping to help you.
膜结构电动车棚之所以会变黄,是因为使用的膜材是PVC膜材,受热变形后会变黄。主要原因如下:
The reason why the membrane structure electric vehicle shed turns yellow is that the membrane material used is PVC membrane material, which will turn yellow after heating deformation. The main reasons are as follows:
聚氯乙烯树脂的光稳定性差。氯化氢去除反应和多烯结构分子通过热和光在支链上发生。当主链中共轭双键数量较少时,会出现微量色差。氯化氢首先与周围潜在的酸性活性物质发生反应,共轭双键成为PVC分子链中新的活 性位点,受到光的大大诱导。
The light stability of PVC resin is poor. Hydrogen chloride removal reaction and polyene structure molecules occur on the branched chain through heat and light. When the number of conjugated double bonds in the main chain is small, there will be a small amount of color difference. Hydrogen chloride first reacts with the surrounding potential acidic active substances, and the conjugated double bond becomes a new active site in the PVC molecular chain, which is greatly induced by light.
聚氯乙烯树脂中含有一些低分子量成分,会降低聚合物的热稳定性。其分 解机理包括自由基机理、离子机理和单分子机理。如果聚合物中有一些杂质,如引发剂、催化剂、酸、碱等。
PVC resin contains some low molecular weight components, which will reduce the thermal stability of the polymer. Its decomposition mechanism includes free radical mechanism, ion mechanism and single molecule mechanism. If there are some impurities in the polymer, such as initiator, catalyst, acid, alkali, etc.
其在聚合过程中加入,或在储存和运输过程中吸水,聚合物的稳定性将降低。因为这些物质会引起分子离子降解反应,所以cpe中含有较多的低分子物质,如cl2、hcl等。硬质聚氯乙烯结构型材是以聚氯乙烯为连续相的多相聚合物和捏合热稳定剂、光稳定剂、润滑剂、填料和颜料的混合物组成的混合体系。
If it is added during polymerization or absorbs water during storage and transportation, the stability of the polymer will be reduced. Because these substances will cause molecular ion degradation reaction, CPE contains more low molecular substances, such as Cl 2, HCl and so on. Rigid PVC structural profile is a mixed system composed of multiphase polymer with PVC as continuous phase and mixture of kneaded heat stabilizer, light stabilizer, lubricant, filler and pigment.
当PVC型材暴露在自然环境中时,PVC组分一旦脱氯化氢,原有的碳酸钙组分会转化为新的氯化钙组分,分散在氧化降解产物层中,形成潜在的吸水位点,这是导致膜材料发黄的原因之一。除了温度和应力之外,聚氯乙烯薄膜在高搅拌、冷搅拌和挤出温度和应力下还会受到剪切应力和拉伸应力。
When the PVC profile is exposed to the natural environment, once the PVC component is dehydrochlorinated, the original calcium carbonate component will be transformed into a new calcium chloride component, which will be dispersed in the oxidation degradation product layer to form potential water absorption sites, which is one of the reasons for the yellowing of the membrane material. In addition to temperature and stress, PVC film will also be subjected to shear stress and tensile stress under high stirring, cold stirring and extrusion temperature and stress.
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