Shanghai Daoqin Plastics Co., Ltd.

        PBT is what?

         terephthalic acid ester (PBT)

         terephthalic acid ester (Polybutylene terephathalate), for 苯二甲 acid ester (DMT) and 1,4 butanediol (1,4-Butanediol) polymerization formed types crystallization property hot can property engineering plastics.

its chemical structure lower:

        PBT in 1970 year 代初期由 USA Celanese company research formed 功, Celanex product upper 市, rear world 知名厂商 Germany BASF, Bayer, USA GE, Ticona, Japan Toray, Mitsubishi chemical, Taiwan new light combined 纤, long 春人造 resin, plastics and other company rear production 行列, full production 厂商共计三十余家.

        PBT also can is thermoplastic polyester plastics, is suitable for different processing use, generally how much add additives, or and its it plastics mixed, 随 添 add material ratio/proportion different, can manufacturing different specifications product. due to PBT tool has heat resistant property, weather resistance, resistant product property, electrical features 佳, water property small, gloss good, widely used in electronics electrical appliances, automotive parts, machine 械, use product and other, PBT product also and ABS, PC, POM, PA and other is large use engineering plastics.

PBT main/primary chemical and material features

        PBT is most tough engineering thermoplastic material 之一, it is semi crystallization material, has non good chemical stability property, machine strong/high degree, electrical insulation features and heat stabilized property. melting point (225℃) and high temperature deformation temperature degree ratio PET材 material need low. Vicat softening temperature large is 170℃. 玻璃化转换 temperature degree (glass trasitio temperature) in 22℃ to 43℃ between. due to PBT crystallization speed degree very high, therefore it viscous property very low, parts processing cycle time relatively short.

        PBT吸 wet features very low. non reinforcement type PBT tensile strength is 50MPa, glass fiber reinforced PBT tensile strength is 170MPa. PBT crystallization very speed, therefore in injection molding process in easy cooling non-uniform formed made parts bending deformation. generally PBT材 material shrinkage rate in 1.5%-2.8% between. 含30% glass fiber reinforced PBT材 material shrinkage 0.3%-1.6% between.

         production capacity distribution

        据不完 full statistics, PBT full production capacity 约200 10,000 tons, its in has ultra- 一 semi production capacity is in inner, lower is 各厂商 production capacity 情况.

table/sheet 1 PBT国 outer and Taiwan production capacity distribution

table/sheet 2 PBT国 inner production capacity distribution

        说明: inner 厂商绝 large separation is using/adopting Germany production technology, production PBT quality and outer versus large.

        PBT main/primary application areas

        1,   automotive industry

         in automotive industry 消费PBT in has semi PBT is and PC形 formed PBT/PC alloy, can as is automotive 保险杆. in addition PBT can used for 车窗马达 outer housing/shell, machine 车马达 parts, automotive device gears box/case, dispersion hot device 格窗, 车身嵌 sheet/plate, cover/cap, 门窗部 parts and other.

        2, electronics electrical appliances

         connectors is 信号间 桥梁, is electronics and electrical 源连接 不 can or parts,

        PBT均衡 material property and price positive combined connectors need. PBT usually add 30% glass fiber mixed as is connectors, PBT因 machine property 质, resistant solvent agent property, formed processing property price low 而广泛 by using/adopting. PBT in electronics product in large applications used as dispersion hot 风扇, dispersion hot is machine inner long time 旋转以帮助 dispersion hot, for plastics material property requirements has heat resistant, flame resistant, insulation property and machine strong/high degree, PBT usually add 30% glass fiber (GF) modified rear used as dispersion hot 风扇之 outer frame and 扇叶.

        3, electrical industrial

        PBT applications is as is pressure device, electrical appliances inner 绕线轴, generally 以PBT add 30% glass fiber reinforced rear injection molding. 绕线轴 material property requirements insulation property, heat resistant property, resistant property, flow property, strong/high degree and other, suitable material has aldehyde resin, PBT, PA6, PET. aldehyde resin property 质都不错, its molding property and PBT, therefore dimensions small, complex product using/adopting PBT resin.

        4, its it applications

        PBT材 material it applications, add 15% glass fiber (GF) PBT材 material used as energy saving 灯 底 base/seat and outer housing/shell, PBT/PC alloy as is 溜冰鞋 shoe sole, its it electrical appliances outer housing/shell, base/seat, 开关, device outer housing/shell, food processing sheet/slice, true 空吸尘 device parts, electrical 风扇, drying machine housing/shell 体, device and other

        PBT材 material injection molding process brief introduction

        1, drying 处理:

        PBT材 material in high temperature lower easy hydrolysis, therefore processing front must drying 处理.

        建议 in gas in drying conditions is 120℃, 6-8 small 时, or 者150℃ lower drying 2-4 small 时. PBT材 material wet degree must small 于0.03%.

        2, temperature degree:

        225~275℃, temperature degree: 250℃.

        3, injection pressure:

         in and other (most large to 1500bar).

         injection speed degree: use can can fast injection speed degree (因 is PBT solid very fast).

        4, mold temperature degree:

         for/regarding reinforcement type material is 40~60℃. need very good design mold cooling 腔道以 decrease small parts bending. hot amount dispersion 失一定 need fast uniform. mold cooling 腔道 直径 is 12mm.

        5, runner:

        建议 use runner increase pressure 传递(experience 公式: runner 直径=塑 parts thick degree +1.5mm).

        6, gate:

         can use various type gate. can use hot runner, need attention/notes anti material and degradation. gate 直径应该 in 0.8t to 1.0t between (t指 plastics made parts thick degree). if use 潜入式 gate, most small is 0.75mm.