Shanghai Daoqin Plastics Co., Ltd.

         polymethyl methacrylate (PMMA), acrylic and its ester type polymerization to polymer acrylic type ester, versus plastics polypropylene (PP) acid type plastics, its in polymethyl methacrylate (PMMA) application most 广泛. polymethyl methacrylate (PMMA) shrink 写代号 is PMMA, has machine 玻璃, is is combined formed transparent material in most excellent, price also comparison product types.

         application 方面:

        PMMA solvent has machine solvent agent, 如苯酚, ether and other, through coating can formed good film, tool has good electrical property can, can as is has machine 场效应 tube/pipe (OFET)亦称 has machine film tube/pipe (OTFT) 介质层.

        PMMA resin is environmental protection material, can used for production tool, 卫生洁 tool and other, tool has good chemical stability property, and weather resistance.

        PMMA resin in 破碎时不 easy generate 尖锐 碎 sheet/slice, USA, Japan and other and already in method in as strong/high made property 规定, in small and 幼儿园 construction use 玻璃必 must using/adopting PMMA resin. full add fast construction 步伐, 街头标志, 广告灯箱 and electrical and other a large amount of 出现, its in use material in has versus 当一部 separation is PMMA resin. 北京奥运 engineering outer color color building materials a large amount of use green environmental protection PMMA resin.

         due to PMMA surface hardness high, easy scratch 毛, impact resistant property can low, molding flow property can and other disadvantages, PMMA modified versus 继出现. methacrylic acid ester and styrene, butadiene copolymer, PMMA and PC blending and other. 372 has machine 玻璃就 is methacrylic acid ester and styrene copolymer 而.

         if in 372 has machine in add a small amount of 丁腈橡胶(约50%)即 can formed 373 has machine 玻璃. PMMA flow ratio PS, ABS差, melt viscosity for temperature degree comparison 敏感, in molding process in, main/primary from injection temperature degree 手 改变 melt viscosity. PMMA is 无定形 polymer, temperature degree large 于160℃, separation understanding temperature degree 达270℃.

        1, plastics 处理

        PMMA tool has 一定 吸 water property, its water absorption 达0.3-0.4%, injection molding must in 0.1% below/following temperature degree, usually is 0.04%. water 份 存 in make melt bubbles, gas marks, transparent degree reduce and other. therefore need drying 处理. drying temperature degree 80-90℃, time is 3 small above.

         recycling material in certain lower can 100% use, 实际份 amount need quality requirements 而定, usually can 30%, recycling material need 避免污染否则会 effect/influence transparent degree and formed product property 质.

        2, injection molding machine selection

        PMMA for injection molding machine has especially requirements. is its melt viscosity large, need relatively deep and relatively large 直径 射嘴孔. if for products strong/high degree requirements relatively high, need use relatively large long ratio screw low temperature 塑化. another PMMA一定 need use drying material material.

        3, mold and gate design

        模肯 temperature degree can is 60℃-80℃, runner 直径应配 combined inner degree, most 佳 角 degree is 5至7, need injection molding 4mm or above products, degree is 7, runner 直径达8至10mm, gate overall long degree need ultra- 50mm.

         for/regarding thick small 于4mm products, runner 直径应 is 6-8mm for/regarding thick large 于4mm products, runner 直径应 is 8-12mm for 边形, and sheet/slice gate deep degree is 0.7至0.9t(t is products thick degree), gate 直径应 is 0.8至2mm; low viscosity selection relatively small dimensions.

         Common gas has 0.05至0.07mm deep, 6mm wide demolding degree is 30′-1 type separation 35′-130 between.

        4, temperature degree

         can use for injection method amount degree: 由210℃-270℃不 and other, specific supply provide material 而定.

        5, injection temperature degree

         can use fast speed injection, need generate high degree internal stress, use more grade injection, slow - fast - slow and other, injection molding thick parts 时, using/adopting slow speed.

        6, time

        若 temperature degree is 260℃, time most more ultra- 10 separation 钟, temperature degree is 270℃, time can ultra- 8 separation 钟.