Shanghai Daoqin Plastics Co., Ltd.

受 retardant type antioxidant tool has 空间受 retardant structure type combined material. according to separation in retardant can 团 数 amount generally separation is 一元受 retardant and more retardant 酚. retardant type antioxidant more used for products, polyurethane ester products and other polymer/macromolecule field/area in, and acid ester, ether and other antioxidant 显示协间效果. polymer stability additives types type more, function 各异. a large amount of research table/sheet 明, different type type, 甚至同一 type type, different product types resistant oxidation agent can can in or resistant function. for BASF company development Irganox B series composite/compounding antioxidant research table/sheet 明, antioxidant combined not only can improvement product property can, reinforcement resistant oxidation 效果, also can reduce cost. if 搭配不当, not only has resistant oxidation function, also accelerated polymer aging.

受 retardant type antioxidant its resistant oxidation good, heat stabilized property high, property low and other more advantages, in recent years 备受关注. resistant oxidation agent is 否 当直接 effect/influence resistant oxidation 效果. therefore, research resistant oxidation agent function mechanism 就显 尤 is important. world large resistant oxidation agent production 厂家都致 force composite/compounding resistant oxidation agent R&D, understanding various resistant oxidation agent between function mechanism for/regarding development resistant oxidation agent new product types tool has important 指导意义.

受 retardant type resistant oxidation agent function mechanism

酚 type resistant oxidation agent as is hydrogen 供体, is application most resistant additives. in as is antioxidant reaction mechanism in, most key/critical reaction is oxidation material 自由基 from in hydrogen formed hydrogen oxidation material and oxygen 基自由基. formed oxygen 基自由基 and other oxygen 基自由基以 different methods reaction formed versus for stability material, related mechanism lower.

this type material can polymer product in high temperature lower long time stability property, also can 维持熔 melt polymer in processing process in stability property. oxygen stability property 由2位 and 6位取代基 空间位 retardant 决定. in room temperature lower, oxygen 基自由基不 from polymer upper absorption hydrogen. retardant type antioxidant in long high temperature lower use 时, its resistant oxidation efficiency 随取代基 increase 而逐渐 reduce, 取代基 is: 2, 6-二叔丁基>2-叔丁基>2-叔丁基-6-甲基>2, 6-二甲基.

受 retardant type resistant oxidation agent main/primary and oxidation material 自由基 reaction, in oxygen lower, lifespan long, 以至于 it 们也会 by retardant 酚捕获. 此时, low water retardant type material high active property more is has 利. certain oxidation material can can polymer color, formed color is structure and reaction 直接结果. through selection has structure type resistant oxidation agent and use combined 适 共 stabilizer, can most large degree decrease/reduce this type of color. in addition, retardant type resistant oxidation agent can can and gas in reaction formed color 团, is gas 体熏蒸 reaction.

polymer/macromolecule material in high temperature lower processing or use 时, due to oxygen 原子 攻击, 会发生 oxidation degradation. more year research 发现, polymer force oxidation process is series reaction. reaction 初期, main/primary material is hydrogen oxidation material in conditions lower separation understanding formed active property 自由基, and large separation or oxygen reaction formed new 自由基, make oxidation reaction 按自由基链 process 进行, formed 于连锁 reaction stage/phase, make it 们不会引起破 bad property reaction.

resistant oxidation agent can separation understanding hydrogen oxidation material formed stability non active property material. according to function mechanism, resistant oxidation agent can separation is resistant oxidation agent and resistant oxidation agent. main/primary resistant oxidation agent can and 自由基 reaction, in active property 链 生 long. resistant oxidation agent can made and 延缓引发 process in 自由基 形 formed, separation understanding hydrogen oxidation material, 钝化残留 in polymer in metal 离子.

受 retardant type resistant oxidation agent is type in ring upper 羟基 一侧 or has 取代基 化 combined material, is main/primary resistant oxidation agent. due to 空间势垒 存 in, 原子容 easy from separation upper 脱落, and oxidation material 自由基, oxygen 基自由基结 combined and 羟基自由基 make its active reaction 终止, this type of mechanism is 链终止施主 mechanism ]. in polymer aging process in, if can has 效 捕获 oxidation material 自由基, can oxidation process. formed oxidation material 自由基 reaction speed degree fast, therefore in oxygen gas in lower, 自由基清 remove agent 会失效.

in retardant type resistant oxidation agent in lower, oxidation material 自由基会 from polymer in 捕获一 质子, in this series 自由基 reaction, this is oxidation control steps. add retardant type resistant oxidation agent 时, it ratio that polymer more easy provide 质子, provide more has reaction formed oxygen 基自由基, make polymer versus for stability, 不会发生进一步 oxidation.

in addition, retardant type can 进行一 捕获 carbon 自由基 reaction, upper in 自由基 can formed poly 体, this type of poly can and oxidation material 自由基 reaction make its active, formed is stability separation 子. due to types retardant less can 捕获2 自由基, therefore its resistant 衰老效果 more good.

and antioxidant versus ratio, semi retardant type antioxidant due to its 羟基邻位取代基 空间位 retardant （ more is 甲基） small, especially is and ester and other antioxidant hydrogen combined, function significantly, performance more excellent heat stabilized property and resistant color property, is type resistant oxidation agent large trend. tool has can 团（如硫原子） 主辅 resistant oxidation agent, resistant 迁移挥发 loss polymer/macromolecule amount resistant oxidation agent, tool has di or other reaction property reaction property resistant oxidation agent, environmental protection resistant oxidation agent and other is retardant type resistant oxidation agent future development focus/key point.