Shanghai Daoqin Plastics Co., Ltd.

GPPS is color, 无嗅, 无毒, non crystallization property transparent thermoplastic property resin. rigid property and surface hardness large, very 脆, resistant impact strong/high degree low, wear resistance 差, its color property and processing property good, resistant 辐射, is types relatively good decoration property material.
 
         . polystyrene (PS) 识别: polystyrene (PS) is color transparent, 无延展 property material, 敲打时 has 清脆响声, can 燃烧, rear 继续燃烧, 火焰呈橙黄 color generate concentrated 黑烟束. another also can will Sample small degree tube/pipe in add 几滴发烟硝 acid, in small upper add hot separation 钟, has bromine 苯醌4- chlorine 化酰亚 amine ether solvent liquid experiment/testing, is styrene 试纸呈兰 color
material property can
1． physical properties: GPPS density is 1.04~1.09, transparent degree high 达88%~92%, light rate is 1.59~1.60, high light rate make its tool has good gloss, tool has decoration 效果. dimensional stability good, mold made as shrinkage rate is 0.45%, wet property low, has 0.02%. therefore can in wet ring lower maintain dimensions stability and strong/high degree 不变.
 
     2． mechanical properties: GPPS mechanical properties temperature degree, time, ring conditions and other factors effect/influence, its long negative strong/high degree is tensile strength 1/3~1/4, product design 时应考虑 to this 一点. its hard ratio its it elastic property material more easy abrasion scratch 而起刮痕, 经退火 can improve/increase products machine strong/high degree.
 
     3． thermal properties: GPPS heat deflection temperature (HDT) is 70~98℃, use temperature degree is 60~80℃, this and large small, time long short has 关, thermal conductivity temperature degree 而变化, therefore can used as cold insulation material. in high true and 330~380℃ lower, product degradation.
 
     4. chemical property can: GPPS不 solvent material 油, has machine acid, alkali, salt, low grade alcohol and it water solvent liquid, can many type, ketone type, high ester 侵蚀而 soft 化, solvent large more 数芳烃化 combined material. its resistant water property relatively 差.
 
     5. ring property can: GPPS虽 for generally outer ring conditions resistant force relatively good for outer effect/influence relatively large, generally 暴露于紫 outer 线时会变 color and 脆化, in ultra- 声波 effect/influence lower degradation.
 
injection molding process

injection molding process key points: a)   raw materials generally drying, 别情况80℃烘2 small 时;b)   molding temperature degree scope/range relatively large, add hot solvent and solid speed degree fast, molding cycle generally relatively short; temperature degree parameters: material temperature degree 200℃ left right, material temperature high easy silver streaks, material temperature low make transparent property 差;c)   mold temperature control: mold temperature generally in 50-80℃;d)  GPPS flow property very good, in need high pressure (usually injection pressure 10Mpa left right), large increase parts internal stress ---- can can cracking (especially is paint decoration rear);e)   injection speed degree 直适当 high decrease low water 纹, injection speed degree injection pressure effect/influence large, high speed degree can can 会导致披锋 or 出模时 mold sticking and ejection 时顶白顶裂 and other issues;f)  适当 back pressure: if back pressure low, screw easy 溢入空 gas, material inner material density small, 胶粒塑化效果不 good, effect/influence parts table/sheet quality (generally back pressure 取10-20kg/cm2);g)   mold upper generally design fine water is 0.8-1.0mm.h)   glass fiber strong/high type PS-GF30, material temperature degree is 180~275, mold temperature degree is 20~80, molding shrinkage 0.1~0.2. density 1.29/cm3 GPPS injection molding process          injection molding process   mono 位   parameters   GP100, GP125, GP150   drying temperature degree   ℃   70~80   drying time   h   2~3   melt temperature degree   ℃   200~220   injection molding temperature degree   喷 嘴   ℃   190~210   一 段   200~220   二 段   190~210   三 段   170~190   mold temperature degree   ℃   30~60   injection molding pressure   grade pressure   MPa   60~90   grade pressure   40~70   grade pressure   30~50   pressure   MPa   0.5~2   screw speed   rpm   30~60   machine injection molding amount   %   50~70

 
application scope
electrical: machine outer housing/shell, electrical machine, insulation material.
machine 械: 尾灯, cold 冻库壁.
建: 百叶窗, thermal insulation 材, 招牌, 隔音材, sheet/plate, 壁材.
day use product: 杯子, container, various 箱子, 牙刷, 梳子, CD box/case, food container, day 杂, tool, 原子笔.
its it: toys, 婴儿, soft use product.
Common issues
溢 material flash, bubbles, shrink 痕, 熔接痕, and 黑纹, silver streaks and 斑纹, surface 划痕, surface and 花纹, 烧焦变 color and 杂质, 烧黑, gloss defect, crazing 泛白, color 不均, low, delamination 剥离, warpage deformation, demolding defect.