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Polyolefins are polymers of olefins. It is a kind of thermoplastic resin obtained by the separate polymerization or copolymerization of α-olefins such as ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene and some cyclic olefins. It is a generic term for a class of thermoplastic resins. Due to the abundant raw materials, low prices, easy processing and molding, and excellent comprehensive performance, it is a type of polymer material with the largest output and a wide range of applications. Among polyolefins, polyethylene and polypropylene are the most important olefins polymers.
Polyolefin will encounter the effects of oxygen and sunlight in nature, which will cause the molecular chain and auxiliary of resin to generate free radical R •, and it will further react with oxygen to form oxidative free radical RO • and peroxide free radical ROO •, The free radical has strong activity and can capture hydrogen from other resin molecular chains and additives to form ROOH hydroperoxide. The unstable hydroperoxide ROOH will be cracked into new free radicals RO • and HO •, The two active free radicals further react with oxygen to form new hydroperoxide ROOH. The automatic catalytic oxidation occurs repeatedly, which causes the compounds to break, degrade and crosslink, resulting in molecular chain rupture completely. Therefore, it is important to solve the aging problem of polyolefins. The application of anti-aging additives is not a simple addition and accumulation, but a unified system that needs comprehensive consideration. The design of polyolefin anti-aging system should start with the selection of additives, and then selecting the appropriate additives, forming a reasonable formula. At the same time considering the synergy of the additives, the appropriate processing technology and the taboos between the additives to achieve the best status. Which additives are necessary for polyolefin outdoor materials?
在聚烯烃中经常使用的有OMNISTAB UV326, UV329, UV531, UVP, UV234等。
Outdoors, sunlight especially ultraviolet light can accelerate the frequency of atomic motion and accelerate the degradation of plastics such as oxidation reaction. UV absorbers are indispensable in polyolefins. UV absorbers can strongly absorb UV rays and convert their energy into harmless thermal energy to release. UV absorbers include benzotriazoles, benzophenones, salicylates and so on.
OMNISTAB UV326, UV329, UV531, UVP, UV234 etc. are often used in polyolefins.
聚烯烃户外材料中常用的光稳定剂有OMNISTAB LS622, LS944, LS119, LS770, LS B783等。
The light stabilizer is mainly a hindered amine light stabilizer. The hindered amine light stabilizer contains a piperidine group, and a piperidine nitroxide free radical is generated after oxidation. Piperidine nitroxide free radicals have greater activity and can react with alkyl free radicals and alkoxy free radicals that are degradation product in the resin to produce piperidine alkylamine ethers and piperidyl peroxide amine ethers, stopping the degradation of the resin. Light stabilizers can continuously self-renew and activate, and can continuously capture newly generated free radicals, thereby achieving the purpose of protecting materials.
OMNISTAB LS622, LS944, LS119, LS770, LS B783 etc. are the light stabilizers often used in polyolefins outdoor materials.
抗氧剂的作用是抑制或延长聚合物的氧化反应，其原理就在于抗氧剂能消除氧化反应过程中生成的过氧化游离基，还原烷氧基或烃基游离基，以及分解过氧化物，从而使氧化链反应终止，达到防止聚合物氧化的目的。聚烯烃中用的抗氧剂有酚类、胺类、亚磷酸酯类和硫酯类。如OMNISTAB AN1010, AN1076, AN1098, AN168, AO-80, AN626等。
The role of antioxidants is to inhibit or prolong the oxidation reaction of polymers. The principle is that antioxidants can eliminate peroxide radicals generated during the oxidation reaction, reduce alkoxy or hydrocarbon radicals, and decompose peroxides. Thus, the oxidation chain reaction is terminated, and the purpose of preventing polymer oxidation is achieved. The antioxidants used in polyolefins are phenols, amines, phosphites and thioesters. Such as OMNISTAB AN1010, AN1076, AN1098, AN168, AO-80, AN626 and so on.
Deltachem (Qingdao) Co., Ltd. is a company specializing in manufacturing and sale of polymer additives. Its own brand of OMNISTAB series of additives, including UV absorbers, light stabilizers, antioxidants and other products, can give comprehensive protection to polyolefin outdoor products, while providing a full range of product solutions according to customer needs.
Deltachem group looks forward to your inquiry and cooperation!