| 塑料紫外线吸收剂能够起到抗氧化的作用吗？ |
| 添加时间：2017/11/7 16:51:46 浏览次数： |
| 塑料是指以高分子量的合成树脂为主要组分，加入适当添加剂，如增塑剂、稳定剂、阻燃剂、润滑剂、着色剂等，经加工成型的塑性材料，或交联固化成型的刚性材料。塑料是20世纪的产物，自从它被开发以来，在各方面的用途日益广泛。对于塑料来说生产过程中后期保持持久不变色，抗黄变是非常重要的，所以生产塑料一般需要加抗紫外线吸收剂，但是紫外线吸收剂的作用原理是什么呢？它究竟能不能起到抗氧化的作用呢？ Plastic is a synthetic resin with high molecular weight as the main component, adding appropriate additives, such as plasticizers, stabilizers, flame retardant, lubricant, coloring, the plastic material processing, rigid material or curing molding. Plastic is the product of twentieth Century. Since it was developed, it has been widely used in various fields. For plastics in the production process of late sustained discoloration, anti yellowing is very important, so the general need to add anti ultraviolet absorbent production of plastics, but what is the principle of UV absorbers? Does it really work as an antioxidant? 一般来说塑料制品变黄都是由材料的老化或是降解产生的。紫外线、氧、热等因素使得塑料老化，高分子主链发生断裂并生成羰基基团，羰基是发色基团，这是塑料变黄的主要原因。因此在塑料制品中常会加入紫外线吸收剂来阻止制品变黄。紫外线吸收剂是一种非常重要的助剂，它主要起到吸收紫外线保护塑料的作用。紫外线吸收剂的应用原理是其能够强烈的、选择性的吸收高能量的紫外线，并以能量转换形式将吸收的能量以热能或无害的低能辐射放出来耗掉，从而阻止高分子聚合物因吸收紫外线能量而发生激发进而发生物理及光化学分解，也阻止了塑料因紫外线照射而引起的变黄现象。紫外线吸收剂的强弱一般是看它吸收紫外线波段的能力，一般的紫外线吸收剂可以吸收200nm-380nm的波长，添加紫外线吸收剂刚好可以把有害的紫外光“吃掉”，从而有效的防止塑料变黄。 Generally speaking, the yellowing of plastic products is caused by aging or degradation of the material. Ultraviolet, oxygen, heat and other factors make the plastic aging, the main chain of polymer break and produce carbonyl group, carbonyl group is chromophoric group, this is the main reason of plastic yellowing. The ultraviolet absorbent added in plastic products often to prevent yellowing. UV absorber is a very important auxiliary, it mainly plays the role of absorbing ultraviolet radiation to protect plastics. The application of the principle of ultraviolet absorber is high energy ultraviolet absorption selectivity can strongly, and the energy conversion form will absorb energy to heat or harmless low-energy radiation released consume, so as to prevent the polymer due to absorption of ultraviolet energy and thus stimulate physical and photochemical decomposition, but also prevent the yellowing phenomenon of plastic caused by ultraviolet irradiation. The intensity of UV absorber is generally its ultraviolet absorption capacity, general UV absorber can absorb 200nm-380nm wavelength of ultraviolet absorbent added just to the harmful ultraviolet light to "eat", so as to effectively prevent the plastic yellowing. 正常情况下紫外线吸收剂可以吸收紫外光，保护塑料免受紫外光的侵害，但是他没有抗氧化的作用，针对塑料抗氧化是指塑料中分子结构在空气中被空气中的氧气分子氧化而变色，塑料分子结构被破坏氧化变黑，所以传统的紫外线吸收剂只是吸收紫外光保护塑料的作用，并没有抗氧化的作用，如果想防止塑料被氧化，则需要再添加塑料抗氧剂。 Under normal circumstances, the ultraviolet absorbent can absorb UV protection from UV damage, plastic, but he did not function as an antioxidant, antioxidant for plastic refers to the plastic in the molecular structure by molecular oxygen in the air oxidation of the color in the air, the plastic molecular structure was destroyed oxidized black, so the traditional ultraviolet absorber just absorption UV protection plastic, and no antioxidant role, if you want to prevent the plastic from being oxidized, you need to add plastic antioxidants. |
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