Shanghai Daoqin Plastics Co., Ltd.

brief introduction

poly 己二酰丁二 amine also polyamide (PA) 46, nylon 46, 简称PA46. polyamide (PA) 46由 Netherlands DSM company in 1984 year achieve industrial development. in 20世纪30 year 代, DuPont company for polyamide (PA) 46 combined formed research, made low molecular weight polyamide (PA) 46. 1979 year, solid versus polycondensation method formed used for polyamide (PA) 46 combined formed, made polymer/macromolecule amount polyamide (PA) 46. to DSM company 提出以 acrylonitrile and hydrogen is raw materials production 1, 4-丁二 amine methods, make polyamide (PA) 46 combined formed toward industrial production 迈进. 至1990 year, DSM company year 产2 10,000 tons industrial production plant/unit. polyamide (PA) 46 production main/primary 由DSM company control, through and DSM combined as, Japan JSR company, Teijin company and 尤尼契卡 company tool development and production polyamide (PA) 46 can force.

材 material advantages

· high temperature resistance property can, can in machine lower long use, welding processing.

· excellent chemical resistance, can long parts use lifespan.

· excellent mechanical properties, decrease/reduce thick degree, from reduce weight and parts price.

· due to its low creep property, excellent resistant fatigue property can and low abrasion loss property can long use lifespan, property can more add can 靠.

· again abrasion use rate can to 25-50%, but also property can obvious decline （获取经济效益 meanwhile maintain product property can can 靠）.

· 仅 cycle time shrink short can improve/increase made equipment 30% production efficiency （ due to high flow property can through increase mold cavity amount improve/increase production efficiency ）.

· due to its excellent mechanical properties and good 模流行 is, provide more large design degree.

· can uniform filling thick degree thin product, from can light injection molding most product.

· using/adopting 80℃ water hot 注模, can achieve 经济, safety and processing.

· 无 flash phenomenon, therefore rear 处理.

· if high temperature application requirements tool has more high resistant thermal properties material, can use and PA6, PA66 or poly same mold, more 换.

PA46 processing molding conditions

in machine 时应当 for molding plant/unit 进行清理, can using/adopting HDPE or its it composite/compounding material 进行清理. composite/compounding material must can 够承受 high temperature can use.

is most molding temperature degree, attention/notes PA46 processing temperature degree upper and lower 限. PA46 in melt high 于330℃时会 generate separation understanding, make time very short. low molding temperature degree can increase material time.

machine temperature degree setting, screw design, screw speed degree and back pressure melt temperature degree. therefore, in injection molding 进行一段 time rear and molding conditions stability conditions lower amount melt temperature degree is non important.

material temperature degree: due to PA46 high melting point and high crystallization property, in 不 于接近330℃ PA46 degradation 点 情况 lower, material temperature degree 需设置 足够 high provide uniform melt.

screw speed: and large more polyamide (PA) 一样, PA46 due to its versus for relatively low melt viscosity tool has excellent flow property. screw speed for/regarding to PA46 melt amount effect/influence versus for relatively low, usually can use high screw speed 而不会 loss 害PA46 polymer. molding processing glass fiber reinforced specifications 时, attention/notes reduce glass fiber (GF) long degree. 因而应 selection can can low screw speed, make screw time rigid good in molding cycle cooling time inner.

back pressure: processing PA46 时 recommendation using/adopting versus 当于7.5巴 back pressure, to uniform melt anti 止卷入 gas 体. high back pressure （如: 2 0巴） will make time long, generate and reduce glass fiber (GF) long degree.

speed degree / pressure: due to PA46  solid speed degree very fast, therefore need relatively high speed degree, obtain excellent pressure melt and surface light degree. therefore need mold gas runner 末端 烧焦情况.

holding pressure pressure / holding pressure time: is obtain parts most excellent appearance and dimensions control, holding pressure time important function. from upper 说, holding pressure time is gate solid time. and its it engineering plastics versus ratio, PA46 due to its fast speed solid features usually short holding pressure time. through long holding pressure stage/phase, can decrease/reduce shrinkage 引起 凹陷 and 空穴. however holding pressure pressure can high generate force. positive pressure water 平 一 types methods is: increase holding pressure pressure to 看不见凹陷 is 止. full cooling rear, in parts most thick 处切开, has 无空穴. if need, can increase large holding pressure pressure. holding pressure time types methods is 测出塑 parts weight, rear increase holding pressure time to obtain weight is 止. types more is complex methods is in type inner 安装传感 device, 以此 确定确切 gate solid time. and PA66 versus ratio, PA46 需约一 semi holding pressure time. this and it relatively high mold opening temperature degree combined 起, can understanding is what and its it engineering plastics versus ratio, PA46 molding cycle time more short.

mold temperature degree / cooling time: due to PA46 solid speed degree fast, therefore its cooling time short. due to this causes, time usually is molding cycle factors. upper 说, PA46 processing process can in very wide mold temperature degree scope/range inner 进行. is obtain good dimensional stability and flow property, recommendation mold temperature degree high 于80℃. is decrease small rear shrinkage amount, increase flow property, improve/increase weld lines strong/high degree and high toughness and surface quality, mold temperature degree can increase 至120℃, more high.

mold opening: PA46 usually viscous in mold surface upper, tool has good demolding features. due to its high crystallization degree, PA46  surface solid fast in high temperature rigid property relatively high. therefore PA46 injection molding parts can in versus for relatively high temperature degree lower, 如200℃ demolding, from make molding cycle shrink short.

[ production 停歇] in production process in will need short 暂停歇时, 应关闭 material 斗, make machine 筒排空 and screw front 置位置, material temperature degree can maintain. for/regarding 1 ~ 2 small production 停歇, using/adopting same steps, is material temperature degree drop 至260℃. in machine 时, use new 材冲洗 material 筒. for/regarding flame retardant grade, in will machine front use HDPE冲洗 material 筒.

[停 machine /清理]结束PA46 production 时应排空 material 斗, use high viscosity grade HDPE material 筒. in 冲洗时 reduce machine temperature degree to will need processing lower polymer temperature degree scope/range.

PA46 injection molding process

一, drying

完装密封 纸 bag: 无需预先 drying. already 开启 纸 bag: must in has remove wet plant/unit drying material inner, in 120℃ temperature degree 进行4 small 时 排风 drying. drying time long short in plastics in wet gas how much degree. in as process in, plastics must in has remove wet plant/unit drying material inner, temperature degree maintain in 100℃.

二, injection molding temperature degree 调控

melt temperature degree in 295℃. 理想 材 material temperature degree can in 300～315℃. （ it 包括材 material fracture tensile value and in 悬臂梁 lower impact resistant value IZOD）.

PA46  rear 段（输送） in 段（ pressure shrink ） front 段（计 amount ） nozzle

不含 fiber add solid 285～300290～305295～310295～310（ material temperature ）

含 fiber add solid 285～305295～310300～315300～315（ material temperature ）

发现 plastics 自由溢出于炉嘴时, must temperature degree decline （当然也 need anti plastics cooling 于炉嘴 inner ）. another 炉嘴必 must pressure sheet/plate, 但如 份 pressure, can amount decrease low pressure.

三, 滞留 time

is anti in as process in 出现严 heavy plastics property can decline, from 而做出理想 mechanical properties.

如 lower most high time:

不含 fiber add solid PA46: 6～10 separation 钟

含 fiber add solid PA46: 5 separation 钟

避免 use large amount injection molding machine, versus for/regarding formed product 体积而言.

滞留 time =循 ring time ×（熔炉筒 inner can 盛载 容 amount / formed product amount ）

四, mold temperature degree

建议 mold temperature degree in 80～140℃ use.

五, application

electrical and electronics application: SMD元 parts, parts, device, 绕线元 parts, electrical 动马达部 parts and electrical appliances parts;

machine parts application: gears, bearings and bearings 罩;

automotive application: device and connectors, 如马达 control system, gas equipment, cable solid parts, 交流发 electrical machine and machine parts, and gas control and 辅助供 gas system housing/shell.