Shanghai Daoqin Plastics Co., Ltd.

        1, acrylonitrile-butadiene-styrene (ABS) plastics (ABS)

         acrylonitrile-butadiene-styrene (ABS) plastics (ABS) is types general purpose type thermoplastic property engineering plastics, its specific property can lower:

         generally property can

        ABS engineering plastics appearance is transparent 呈象牙 color material, its products can made formed 五颜六 color, tool has high gloss degree. ABS versus for density is 1.05 left right, water absorption low. ABS同 its it material combined property good, easy surface printing, coating and plating 处理. ABS oxygen index (LOI) is 18%~20%, easy polymer, 火焰呈黄 color, has 黑烟, 并发出特殊 肉桂味.

         force property can

        ABS has excellent force property can, its impact strong/high degree good, can in low temperature degree lower use: ABS wear resistance excellent 良, dimensional stability good, also tool has oil resistant property, can used for in and other and speed lower bearings. ABS creep resistance ratio PSF and PC large, ratio PA and POM small. ABS flexural strength and pressure shrink strong/high degree plastics in relatively 差. ABS force property can temperature degree effect/influence relatively large.

         hot property can

        ABS heat deflection temperature (HDT) is 93~118℃, products 经退火处理 rear also can improve/increase 10℃ left right. ABS in -40℃时 still can performance 出一定 tough property, can in -40~100℃ temperature degree scope/range inner use.

         electrical property can

        ABS electrical insulation property relatively good, and 几乎不受 temperature degree, wet degree and frequency rate effect/influence, can in large more ring lower use.

         ring property can

        ABS不受 water, machine salt, alkali and multiple acid effect/influence, can solvent ketone type, aldehyde type and chlorine in, 受冰乙 acid, material and other 侵蚀会 generate force cracking. ABS weather resistance 差, in outer light function lower easy generate degradation;于户 outer semi year rear, impact strong/high degree decline semi.

        ABS resin application

        ABS resin most large application areas is automotive, electronics electrical appliances and building materials. automotive field/area use automotive table/sheet sheet/plate, outer sheet/plate, inner decoration sheet/plate, direction 盘, sheet/plate, 门锁, 保险杠, tube/pipe and other very more parts. in electrical appliances 方面则 widely used in electrical 冰箱, electrical machine, machine, device, machine, machine and other electronics electrical appliances in. building materials 方面, ABS pipe/tube, ABS卫生洁 tool, ABS decoration sheet/plate. in addition, ABS also 广泛 应 used for packaging, furniture use product and use product, industrial in machine and table/sheet.

         automotive inner 饰追求 important indicators 包括美观, low odor, force property can good, heat resistant, weather resistant and other. automotive material can meet/satisfy various inner parts use requirements, material tool below/following conditions: good flow property; excellent impact resistant property; easy processing molding; easy color, spray coating; low odor;良 good corrosion resistant property;亚 light 效果. ABS also by used for 3D printing.

        2, polycarbonate (PC) (PC)/ABS alloy

         is 克服ABS above disadvantages, generally will polycarbonate (PC) (PC) and ABS blending, made PC/ABS alloy, usually PC/ABS quality ratio is 70/30. this ratio/proportion is comprehensive thick degree, temperature degree and other factors for impact property can effect/influence. alloy combined ABS材 material molding property and PC force property can, impact strong/high degree and resistant temperature property, UV resistant and other property can, can application in automotive internal parts, various machine, device 材, home appliances use product and lighting equipment upper.

         automotive inner outer 饰: table/sheet sheet/plate, 饰柱, table/sheet front cover/cap, 格栅, inner outer trim parts

        商务 equipment machine housing/shell and inner parts: 笔记本/台式 electrical 脑, machine, printing machine, 绘图仪, device

         electrical 信, electrical outer housing/shell, parts and can 卡(SIM卡):

         electrical appliances product: electronics product outer housing/shell, electrical table/sheet and housing/shell 体, use 开关, and base/seat, cable electrical pipeline

        家 use electrical appliances: machine, machine, micro inner external parts

        PC/ABS injection molding process conditions:

         processing front must drying 处理. wet degree small 于0.04%, drying conditions is 90~110℃, 2~4 h;

        熔化 temperature degree is 230~300℃;

         mold temperature degree: 50~100℃.

         injection molding pressure according to plastics parts different 而定.

         injection speed degree need can can high.

         chemical and material features: PC/ABS tool has PC and ABS两者 comprehensive features. 例如ABS easy processing features and PC excellent force features and heat stabilized property. ratio rate will effect/influence PC/ABS材 material heat stabilized property. PC/ABS this type of mixed combined material also excellent flow property. shrinkage rate in 0.5% left right.

        3, injection molding PC/ABS products 经常出现 issues and solution methods

        1, silver streaks issues silver streaks is PC/ABS材 material most Common issues, silver streaks also 称银纹, water 花, material and other, is in products surface flow direction 出现 银 color filament strip/profile phenomenon.

         main/primary causes is gas dry 扰, its in generate gas also main/primary separation is types formed separation: gas: and injection shot stage/phase 卷入 空 gas; water separation: material 本身含 has water separation;裂 understanding gas: high temperature hydrolysis / hot separation understanding generate gas 体.

         solution methods: 首先检查材 material is drying separation, in 确认材 material drying separation rear, again through adjustment injection molding process improvement silver streaks defect. meanwhile, injection molding silver streaks defect also and mold gas has 关.

        2, flow issues flow is material material in injection generate, causes is material material flow property defect, flow and different, appearance 不一样.

         solution methods: can through improve/increase material material temperature degree from improvement flow property 避免, improve/increase material material in mold inner flow property and reduce injection speed degree.

        3, shrink and issues shrink is due to material material in mold cavity inner 充模不足而引起.

         solution methods: improve/increase mold temperature degree and material material temperature degree improvement material material flow property, long injection holding pressure time, increase injection molding pressure, add large injection speed degree improve/increase property, can add large gate dimensions, add hot gate runner decrease/reduce and remove products shrink 孔;

        凹痕 is due to material material temperature degree 不当, and products design 不妥引起, material material temperature degree low 时, not only generate shrink 孔, also 会出现凹痕 issues, material material temperature degree high, mold temperature degree high, make material in cooling separation shrinkage, from generate 凹痕.

         solution methods: improve/increase injection speed degree.

        4, warpage deformation issues injection molding parts warpage deformation is due to made parts design combined 理, gate 位置不当 and injection molding processing conditions combined 理, 以致于 internal generate internal stress, shrinkage or degree 致, mold temperature degree high or mold temperature degree non-uniform, injection molding parts viscous film formed demolding difficult, or cooling non-uniform, 同样会 generate warpage deformation;

         solution methods:

         processing process 方面: add long injection molding cycle, reduce injection molding temperature degree, adjustment injection molding pressure and injection speed degree, meanwhile reduce ejection speed degree, increase ejection 面积, maintain ejection force 均衡;

         products design 方面: increase thick, increase add strong/high and 圆角处 补 strong/high;

        5, issues usually is due to high speed injection 时, material expand 张进入 mold cavity formed “ melt 破裂” 致.

         solution methods:

         molding process 方面: improve/increase material material temperature degree, nozzle temperature degree, decrease slow injection speed degree and other decrease/reduce 斑纹 出现;

         mold 方面: improve/increase mold temperature degree, increase increase 溢槽, increase gate dimensions, gate 形状.

        6, issues solution methods: dispersion property 差, add dispersant or 油, rise high temperature degree, add back pressure. also has is is mold issues. use its it material.

        烤 material temperature degree time is 否足够. adjustment mold temperature degree.

        7, products “ peeling ” issues plastics product peeling issues and high force lower 导致 流体 破裂 has very large 关系, in low 剪切应 force or speed rate lower, various factors small by melt made;而 in high 剪切应 force or speed rate lower, in difficult made, development formed unstable flow;当达 to 一 临界剪切 force 时, will 引起流体 破裂.

         solution methods:

        材 material 方面: is mixed material formed peeling defect is need 第一步 troubleshooting, PC and ABS两组份 between is separation versus 容, therefore in modified process in need add 入适当 increase agent improve/increase its versus property;

         mold 方面: mold design 原则需遵 from amount decrease/reduce direction 进行. generally 说, 密集皮纹面 product more add easy generate peeling phenomenon (high speed filling melt in type inner and type inner 壁 摩 scratch 剪切 致); meanwhile gate design upper, gate dimensions small, will generate melt through gate generate degree 剪切, 继而导致 product surface peeling;

         injection molding process: main/primary direction is degree 剪切. in product filling difficult 时, can using/adopting high speed high pressure methods improvement, therefore in injection molding process in, also can improve/increase injection molding temperature degree / mold temperature degree, and improve/increase material flow property methods reduce filling process in flow retardant force, from 而避免 high speed high pressure degree 剪切.