Shanghai Daoqin Plastics Co., Ltd.

         utilizing dry powder or color masterbatch and other methods color plastics products 时, can can color phenomenon, from effect/influence product quality.     

        变 color can can lower 述方面 causes 引起:

        (1) high temperature molding 时, resin oxidation degradation 引起;

        (2) due to plastics products certain separation, 如基体 and additives, or and color material, or additives and material 间发生 chemical reaction 致;

        (3) due to color material or additives and other high temperature resistance 引起, and other and other. through this factors color mechanism, is more plastics products provide 参考, positive selection Raw Materials, from production combined plastics products.

         plastics molding processing color 变化

        1. high temperature molding 时, resin oxidation degradation color

        当 plastics molding processing equipment add hot or add hot sheet/plate 因失控而一直处于 add hot 状态时, easy local temperature degree high, make resin in high temperature lower oxidation separation understanding, for/regarding that hot property plastics, 如PVC and other, in molding processing more easy this type of phenomenon, heavy 时, will 烧焦变黄, 甚至变黑, 并伴随 a large amount of low separation 子挥发 material 逸出.

         this type of degradation understanding poly, random 断链, and low separation material remove and other reaction.

        (1) understanding poly

         understanding poly reaction in large separation 子未端 fracture,,然 rear 按连锁 mechanism speed remove mono 体, in polymerization upper temperature degree above especially easy 进行.

        (2) random 断链(degradation)

         for/regarding 诸如PE and other polymer in high temperature molding 时, its 主链任何位置都 can can fracture, molecular weight speed decline, mono rate very less, this category of reaction as random 断链, has 时也称 as degradation, polyethylene (PE) rear formed 自由基 active property very high, also has relatively more grade hydrogen, easy 发生链转移 reaction, 几乎无 mono generate.

        (3)取代基 脱 remove

         polyvinyl chloride (PVC), poly acid ethylene ester, polypropylene (PP) 腈, poly fluorine ethylene and other hot 时, 取代基 will remove. polyvinyl chloride (PVC) (PVC) is 例, PVC in 180~200℃ below/following temperature degree processing molding, in relatively low temperature degree (如100~120℃) lower, 即开始脱 hydrogen (HCl), 200℃ left right HCl very fast, make polymer formed deep color, strong/high degree low, reaction 简示如 lower: ﹏CH2CHCIH2CHCl～～→～～CH=CHCH=CH～～+2HCl

        游离HCl for chlorine hydrogen has catalytic function, metal chlorine material,如 chlorine hydrogen and processing equipment function formed chlorine iron, promote catalytic. 3HCl+Fe→FeCl3+3HCl

        PVC in hot processing must add separation acid absorption agent, hard acid 钡, has machine 锡, combined material and other, improve/increase its stability property.

         utilizing cable color 市话通迅 cable 线时, copper upper polyolefin stability good, polymer — copper interface upper 就会形 formed green acid copper. this reaction make copper expand dispersion polymer in, accelerated copper catalytic oxidation.

         therefore, is reduce polyolefin oxidation degradation speed rate, add type or amine type antioxidant (AH), upper reaction, formed active 泼 自由基A·: ROO·+AH-→ROOH+A·

        (4) oxidation degradation

         polymer in processing and use need 接触空 gas in oxygen gas, in hot 时, accelerated oxidation degradation.

         polyolefin hot oxidation belongs to 自由基连锁 reaction mechanism, has catalytic is, can separation is 引发, growth, 终止三步 reaction.

         hydrogen oxidation 基团引起 链 fracture molecular weight reduce, its 均裂 主产 material is alcohol, aldehyde, ketone, most rear oxidation formed acid. acid for metal catalytic oxidation main/primary function.

        2. plastics molding processing 时, color agent high temperature resistance 而发生 separation understanding color color

         used for plastics color material or material in resistant temperature 极限, to this 一极限 temperature degree, material or material will chemical 变化, formed various relatively low molecular weight combined material, its reaction relatively complex; different material in different reaction and material, through heavy and other analysis methods can testing different material resistant temperature property, generally:

         color agent and resin reaction color 变化

         color agent and resin reaction main/primary performance in certain material or material and resin in processing molding 时发生, this chemical reaction will color versus 变化, make polymer degradation, from make products property can 发生变化.

        1. also reaction

         certain high poly material, nylon and plastics in melt lower, is very strong/high acid property also agent, it can make in processing temperature degree lower very stability material or material by also color.

        2. alkali function

         polyvinyl chloride (PVC) emulsion polymer or certain stability polypropylene (PP) in alkali metal, can and color agent in alkali metal 发生“ alkali function ”, from make color from color formed color.

        PVC emulsion polymer is VC in emulsification agent (如十二烷基磺 acid 钠C12H25SO3Na) water solvent liquid in 借助搅拌 polymerization methods, reaction in has Na+; is improve/increase PP heat resistant oxygen property can, add has 1010, DLTDP and other antioxidant, antioxidant 1010 is 由3, 5一二叔丁基一4一羟基丙 acid ester and 季戊四 alcohol acid catalytic lower ester reaction, 而DLTDP is 由Na2S water solvent liquid and acrylonitrile reaction made 备硫代二丙腈, hydrolysis formed 硫代二丙 acid, most rear use month alcohol ester 化而, reaction in 亦均含 has Na+.

         in plastics products molding processing 时, resin in Na+ will and has metal color material 如C.I.Pigment·Red48:2(BBC or 2BP)发生 reaction:XCa2++2Na+→XNa2+ +Ca2+

        3.颜 material and hydrogen (HX)间 reaction

        PVC in temperature degree rise 至170℃ or light function lower HCI而形 formed di 键.

        含卤 flame retardant property polyolefin or has color flame retardant plastics products in high temperature molding 亦脱卤化 hydrogen HX.

        (1)群青 and HX reaction

        广泛 used for plastics color or 消 黄 light 群青颜 material, is types composite/compounding material.

        (2) copper powder material accelerated PVC resin oxidation separation understanding

         copper material high temperature can by oxidation formed Cu+, Cu2+, will accelerated PVC separation understanding

        (3) metal for polymer bad function

         certain material for polymer has bad function, color material C.I.PigmentRed48:4不适 combined PP plastics products molding, causes in 于变价 metal 锰离子 in PP hot oxidation or light oxidation in, through electronics catalytic hydrogen oxidation material separation understanding 导致PP accelerated aging; polycarbonate (PC) in ester 键, add hot easy hydrolysis and alkali separation understanding, 一旦颜 material in in metal more easy promote separation understanding; metal 离子也会促 make PVC and other resin hot oxygen separation understanding, 并导致 color 变化.

        综 upper 述, production plastics products 时, 我们应避免 use and resin reaction color material is most can has 效 办 method.

         color agent and additives reaction

        1, 含硫颜 material and additives reaction

        含硫颜 material, 如镉黄(CdS and CdSe solid solvent 体), due to resistant acid property relatively 差, used for PVC, 也不应 and additives use.

        2, 含铅化 combined material and stabilizer reaction

        铬黄颜 material or 钼铬红 in formed separation and antioxidant 如硫代二 hard acid ester DSTDP reaction.

        3, material and antioxidant reaction

         add has antioxidant resin, 如PP, remove front 述“3.2”之 outer, certain material and antioxidant 亦会发生 reaction, decrease low antioxidant function, make resin hot oxygen stability property poor. 例如, type antioxidant easy by absorption or and its reaction active property; white or shallow color plastics products in type antioxidant and titanium 离子形 formed 酚状芳烃络 combined material make products yellowing phenomenon, through selection combined antioxidant or add additives, resistant acid zinc salt (hard acid zinc) or P2 type acid ester anti white material (TiO2) color 变.

        4, material and light stabilizer reaction

        颜 material and light stabilizer function, remove front already 述含硫颜 material and light stabilizer reaction outer, generally reduce light stabilizer use, especially retardant amine light stabilizer and nitrogen 黄, material function, its light stabilization decline more is obvious, also 不如未 color stability, phenomenon currently 尚无确切 understanding 释.

         additives reaction

         many additives use 不当, will has can can 发生意想不 to reaction make products color 变. flame retardant Sb2O3 and resistant reaction formed Sb2S3: Sb2O3+–S–→Sb2S3+–O–

         therefore, in production formulation 时, must selection additives.

         additives oxidation color 变

        酚 type stabilizer oxidation, is promote white or shallow color products color important factors, this type of color in outer is “Pinking”(泛红), it is 由诸如BHT antioxidant (2-6-二叔丁基-4-甲基苯酚) oxidation material combined, 并形如3,3′,5,5′一均二 styrene 醌淡红 color reaction material, this type of color in has oxygen and water and light lower 发生,曝置 in outer light lower, 淡红 均二 styrene speed separation understanding formed color mono ring material.

         color material in light hot function lower 互变异构引起 color 变

        部 separation color material in light hot function lower, separation type 互变异构, use C.I.Pig.R2(BBC)颜 material nitrogen type is type, 改变 原共轭效变, 引起共轭键 decrease/reduce, color from deep color light formed shallow color color; meanwhile, in light catalytic function lower, and water separation understanding, make crystallization water 发生变化而引起褪 color.

         large gas material color 变

         plastics products or use 时, reaction property 基团, tube/pipe is resin also is additives, or color material, in light, hot function lower, will and large gas in water separation or chemical material acid, alkali and other function, various complex chemical reaction, 久而久之, will 导致褪 color or color, through add combined hot oxygen stabilizer, light stabilizer, or selection excellent weather resistant additives and material can or and this type of 情况 发生.

        结论

        （1） high temperature molding 时, resin oxidation degradation can can color 变;

        （2） color agent high temperature lower color 会引起 plastics products color;

        （3） color agent and resin or additives chemical reaction will color 变;

        （4） additives reaction and additives oxidation will color 变化;

        （5） color material in light hot function lower 互变异构会引起 products color 变化;

        （6） large gas material will can can plastics products 发生变化.