Shanghai Daoqin Plastics Co., Ltd.

         is 进一步 improvement hot solid and thermoplastic property plastics mechanical properties. in plastics in add glass fiber filler (简称 glass fiber (GF)), as is reinforcement material,以 resin is adhesion agent formed new type composite/compounding material,通称 is reinforcement plastics (hot solid property plastics reinforcement plastics also is 玻璃钢). due to plastics formulation glass fiber product types, long degree, content and other different, its process property and use features 也各不 same. main/primary introduction pressure use hot solid property reinforcement plastics and injection use thermoplastic property reinforcement plastics.

         hot solid property reinforcement plastics

         hot solid property reinforcement plastics is resin, reinforcement material, additives and other formed. its in resin as is adhesion agent, it requirements has good flow property, solid speed degree, material less, easy adjustment viscosity and good solvent property,并需 meet/satisfy parts and formed requirements. reinforcement material skeleton/framework function, its product types specifications more main/primary use glass fiber, generally content is 60%, long degree is 15-20mm. additives adjustment viscosity dilute agent (use 以改进 glass fiber (GF) and resin adhesion), use adjustment resin - fiber interface glass fiber (GF) surface treatment agent, use 以改进 flow property, drop low shrinkage,提 high gloss degree and wear resistance and other use filler and color material and other. due to selection resin, glass fiber (GF) product types specifications (long degree, 直径,无 alkali or alkali,支数,股数, add or 无捻), surface treatment agent, glass fiber (GF) and resin mixed made process (预 mixed method or method, plastics ratio and other different its property can 也各不 same).

         process features

        1, flow property reinforcement material flow property ratio generally pressure plastics 差, flow property large easy generate resin and glass fiber (GF) separation poly 积. small formed pressure and temperature degree will significantly improve/increase. effect/influence flow property factors very more, need certain types material flow property,必 must formed as specific analysis.

        2, shrinkage rate reinforcement plastics shrinkage rate ratio generally pressure plastics small, it main/primary hot shrinkage and chemical structure shrinkage formed. effect/influence shrinkage factors is plastics product types. generally aldehyde material ratio ring oxygen, ring oxygen aldehyde, saturated and polyester and other material need large, its in saturated and polyester material shrinkage most small. its it effect/influence shrinkage factors is parts and thick, thick shrinkage large, plastics in filler and glass fiber (GF) amount large shrinkage small,挥发 material content large shrinkage large, formed pressure large,装 material amount large shrinkage small, hot demolding ratio cold demolding shrinkage large, solid 化不足 shrinkage large,当 add pressure machine and formed temperature degree 适当, solid separation uniform shrinkage small. 同一塑 parts its different shrinkage 也各不 same, especially for thin parts more is 突出. generally shrinkage rate is 0-0.3%, 而0.1-0.2% 则居 more, shrinkage large small also and mold structure has 关,总之 selection shrinkage comprehensive 考虑.

        3, pressure shrink ratio reinforcement material ratio 容, pressure shrink ratio relatively generally pressure plastics large,预 mixed material more large, therefore in mold design 时需取 relatively large material 室, meanwhile toward inner material relatively difficult, especially mixed material more is 不便,但如 using/adopting material formed process pressure shrink ratio can significantly decrease small.

        装 material amount generally can 预先估算, pressure rear again as adjustment. 估算装 material amount methods can lower types:

        (1)计算 method material amount can 按公式(1-3)计算:

        A=V×G(1+3-5%) (1-3)

        式 in A-装 material amount (克), V-塑 parts 体积(cm3), G- use plastics specific gravity (克/cm3), 3-5%- material material material, and other loss consumption amount value.

        (2)形状简化计算 method will complex 形状塑 parts formed dry simple 形状组 formed, meanwhile will dimensions versus more again 按简化形状进行计算.

        (3) specific gravity comparison method metal or its it material parts made parts 时,则 can will parts material specific gravity and weight and selection reinforcement plastics specific gravity ratio 求 装 material amount.

        (4)注 type comparison method use resin or wax and other type material mold type formed rear again parts specific gravity comparison method 求 装 material amount.

        4, material material reinforcement material its glass fiber (GF) and resin mixed combined made formed raw materials methods can separation is lower types 状态.

        (1)预 mixed material is will long 达15-30mm glass fiber (GF) and resin mixed combined dry formed, it ratio large, flow property ratio material good, formed fiber easy loss 伤, quality uniform property 差,装 material difficult,劳动 conditions 差. suitable for pressure made in small type, complex plastics and a large amount of production 时,不宜 used for pressure made requirements high strength parts. use mixed material need anti material “结” make flow property speed decline. material solvent property defect, resin and glass fiber (GF) easy separation poly 积.

        (2)预浸 material is will glass fiber (GF) resin,烘 dry short formed. it flow property ratio mixed material 差, material versus solvent property 差, ratio small, glass fiber (GF) strong/high degree loss small, material material quality uniform property good,装模时 easy parts 形状受 force 状态进行 combined material, suitable for pressure made complex high strength plastics.

        (3)浸毡 material is will short fiber uniform in 玻璃布 upper resin formed material, its property can upper 述两者 between. suitable pressure made simple, thick degree 变化不 large thin large type parts.

        5, hard speed degree and property reinforcement plastics its hard speed degree can separation is fast speed and slow speed types. fast speed material solid fast,装 material mold temperature high, is suitable for compression molding small type parts and a large amount of production commonly used raw materials. slow speed material suitable for pressure made large type parts,形状 complex or has property can requirements and small amount production 时, slow speed material must heavy selection rise temperature speed degree, fast easy internal stress, hard 化不匀, filling defect. slow reduce production efficiency. therefore mold design 时应预先 understanding use material requirements.

         various material has its 允许贮存期 and conditions. ultra- 期 or conditions defect 者都会导致 plastics 变质, effect/influence flow property and parts quality,故 mold trial and production 时都应 attention/notes.