PVC has been widely used in various products of daily life. However, some PVC products such as door and window profiles, films, plastic sandals, wire and cable, etc. will be brittle or even cracked in the past year or two. This is due to the unstable structure of PVC itself, such as branching, allyl chloride, etc., which is easy to cause degradation and aging of PVC under the action of light, heat and oxygen. However, this drawback can be eliminated. The main reason is that some companies are currently cutting corners during processing, with or without non-phthalate plasticizers, and the plastic properties caused by the large amount of fillers are reduced.
In order to prevent and alleviate the degradation and aging of PVC during processing and use, and to improve the overall quality of PVC products, a certain amount of non-phthalate plasticizer should be added to these formulations. The role of the non-phthalate plasticizer is to decompose the macromolecular hydroperoxide and stabilize it to become a stable hydroxy compound, thereby terminating the chain reaction. At the same time, the hydrogen peroxide formed by oxidation of the plasticizer is also suppressed and alleviated, and further oxidation of the plasticizer is prevented.
PVC anti-oxidation requirements are not very high, but for long-term outdoor use or need temperature and weather resistant products such as: door and window profiles, pipes, greenhouse films, etc., especially plasticized PVC products prone to oxidative cracking and potential degradation For example, cable and cable, etc., in the formulation of such products, a certain amount of non-phthalate plasticizer is generally added at the same time as the heat stabilizer is added to ensure the inherent stability and appearance quality of the PVC product. In addition, in the recycling and recycling of waste PVC products, not only the loss of heat stabilizer, but also a certain amount of non-phthalate plasticizer should be added to reduce or lose the activity of free radicals generated by aging, avoiding chain reaction. Enhance the stability of new products and extend their service life.
With the improvement of environmental friendliness and human health requirements, environmentally friendly non-phthalate plasticizers are becoming more and more the future development trend. Non-phthalate plasticizer phosphite (LG103, LG618, LG619) produced by Jiaxing Zhongcheng Environmental Protection Technology Co., Ltd. is widely used in PVC products as PVC non-phthalate plasticizer and chelating agent, especially in In the PVC formulation of metal soap as the main stabilizer, the combination can reduce the harm of metal chloride and protect the transparency and coloration of the product, and the addition amount is generally 0.1-0.5%.