Shanghai Daoqin Plastics Co., Ltd.

         foam plastics is plastics products in large type, will from foam plastics features 讲起, from more is detailed introduction.

         foam plastics is what

         foam plastics a large amount of gas micro dispersion solid plastics in formed type polymer/macromolecule material, 也叫 more plastics, micro plastics .

         features

        (1), heavy very low;

        (2), tool has excellent impact, can amount absorption property;

        (3), for temperature, wet degree 变化适应 property strong/high;

        (4), chemical stability property good, 本身不会 for inner material generate 腐蚀, for acid, alkali and other chemical product has relatively strong/high resistant property;

        (5), thermally conductive rate low;

        (6), molding processing 方便, can using/adopting pressure, extrusion, injection and other molding methods made formed various foam 衬垫, foam block, sheet/slice and other;

        (7), ratio strong/high degree high.

         classification

        按 soft hard degree separation:

         soft foam plastics: in 23℃ and RH50% conditions lower, elastic property modulus small 于70MPa, has flexibility property, pressure shrink hardness very small, force understanding remove rear can 恢复原状, deformation relatively small;

         hard foam plastics: elastic property modulus high 于700MPa, flexibility property, pressure shrink hardness large, force to value generate deformation, understanding remove force rear can 恢复原状;

         semi hard foam plastics: elastic property modulus in 70～700MPa between, property 质介于两者 between.

        按 density separation:

         density >0.4g/cm³, low foaming;

         density =0.1～0.4g/cm³, in foaming;

         density <0.1g/cm³, high foaming.

        按 gas structure different separation:

        开孔 foam plastics ——孔 and is versus 通, tool has good property can and property can;

        闭孔 foam plastics ——每一孔 is 独立, tool has relatively low thermal properties and relatively small water property.

         Common foam plastics types type

        4 foaming methods

         material method:

        1, will low 沸点烃 type (如己烷, and other) or 卤代烃(二 chlorine 甲烷, fluorine and other) type solvent plastics in, hot plastics soft 化, meanwhile solvent liquid 体挥发膨胀 foaming. polystyrene (PS) foam plastics.

        2, will inert property gas 体(N2, CO2, CH4, H2) pressure shrink rear in high pressure lower and polymer melt mixed combined, drop pressure rear gas 体膨胀 foaming.

        3, in micro method and other.

         chemical method can separation is type:

        1, chemical foaming agent, utilizing it in hot separation understanding gas foaming. commonly used chemical foaming agent, nitrogen 二甲酰 amine (NH2CON=NCONH2, AC foaming agent, gas amount 200-300ml/g), nitrogen 二异丁腈, N, N′-二亚硝基五亚甲基四 amine, carbon acid hydrogen and other.

        2, utilizing polymerization process in gas 体, type is polyurethane ester foam plastics, 当异氰 acid ester and polyester or polyether polycondensation reaction 时, separation acid ester and water, or reaction formed oxidation carbon.

        5 foaming formulation separation

         foaming additives

         can and foaming agent use, adjustment foaming agent separation understanding temperature degree and separation understanding speed degree, can foaming process, stability foam structure and improve/increase foam quality. its function different can separation is foaming promote agent, foaming made agent, foam stabilizer and catalytic agent and other.

         foaming promote agent

         can reduce foaming agent separation understanding temperature degree type material 质, specific product types has: zinc combined material, combined material, combined material, has machine acid, and its material and 氨基化 combined material and other.

         foaming made agent

         can make foaming agent 钝化, long foaming time. commonly used has: has machine acid, 酰卤, acid 酐, more 元酚, more alcohol, nitrogen material, 含硫化 material, acid salt, acid salt and other.

         foam stabilizer

         is type surface active property agent, can stability foam structure and foaming quality, its function mechanism is reduce foaming liquid surface force, make can generate a large amount of small bubbles control small bubbles distribution uniform, 自动修复泡孔壁 thin low 处, make 之不破泡. foam stabilizer used for liquid resin, 如PU, PF and other foaming formulation in, is liquid resin foaming formulation in can less separation 之一. foam stabilizer main/primary product types has has machine silicon type, more alcohol type, silicon ketone type, 磺化脂肪 alcohol, 磺化脂肪 acid and its it non surface active property agent and other, add amount generally is 0.5%~2.5%.

         catalytic agent

         main/primary used for PU foam plastics in, its function is: add fast reaction speed rate, for foaming process to has control function, make growth reaction and foaming between 建立起良 good balanced. commonly used catalytic agent is amine type and type.

         nucleating agent

         is is can to uniform foam add 入 一 type material 质, its function methods can separation is in foaming agent separation understanding front foaming can formed gas saturated and 状态; can formed gas versus formed in 心 化 combined material.

         crosslinked agent

         main/primary used for polyolefin type resin foaming. its function in improve/increase melt viscosity, from increase large 泡孔壁 strong/high degree, anti 止泡孔破裂.

        6 foaming plastics 实例1PVC foam plastics

         Raw Materials

        ① resin made foam plastics selection formed property emulsion resin, its degree fine easy formed but also belt/tape has surface active property agent, for formed has 利.

        ② increase agent is made tool has property and shrink property soft polyvinyl chloride (PVC) foam, need add a large amount of increase agent.

        ③ foaming agent foaming agent separation understanding temperature degree generally can high plastics temperature degree, 否则就不 can production density relatively small foam plastics.

        ④ stabilizer this is is anti polyvinyl chloride (PVC) hot separation understanding add 入 一 types additives.

        ⑤ its it separation according to products property can need also can add lubricant, filler, material and other its it separation.

         production methods

         hard polyvinyl chloride (PVC) foam plastics, main/primary using/adopting pressure made molding. soft polyvinyl chloride (PVC) foam plastics can using/adopting pressure made, extrusion, injection and calendering and other methods molding.

        ① pressure made method pressure made method 包括配 material made 糊, material 入模并 make inner material in add pressure and add hot 情况, foaming and 塑化, cooling, foam material, and in temperature degree lower make foam material 进一步膨胀而 formed is products and other process.

        ② extrusion method in extrusion process has types. types is will raw materials in low foaming agent separation understanding temperature degree material inner 塑化并挤 formed tool has 一定形状 in product, rear again in extrusion machine outer rise temperature foaming make its formed is products. products large more is low density foam plastics products. types process is using/adopting has low temperature foaming agent raw materials foaming in material inner 进行, make 挤离口模 extrusion material in cooling rear formed is products, this type of products density usually ratio use front method made formed high.

        ③ injection method injection method products in 尚 限于 high density (俗称 low foaming products). injection equipment usually 均以移动 screw is 主. injection process large upper and generally injection same, plastics rise temperature, mixed combined, and foaming (more 于50%)都 in injection machine inner 进行.

        ④ calendering method   calendering products main/primary is 人造革.

        PE foaming

         foaming features

         crystallization property plastics, 不利于 foaming. blending, can increase 熔化区 wide degree, crystallization time foaming.

         foaming additives selection

         nucleating agent: improve/increase quality and dispersion uniform property, commonly used nucleating agent has: slip powder, oxidation silicon, carbon acid and acid and other.)

         flame retardant: can add amount composite/compounding flame retardant. add amount more formed pressure in, 泡孔破裂 and 并孔, 不利于 pressure and separation 配, pressure shrink deformation increase large.