Shanghai Daoqin Plastics Co., Ltd.

         in automotive strip/profile industry in, large separation strip/profile product is soft 质PVC is 主(hardness scope/range is HA50-HA85). due to PVC resin 玻璃化转变 temperature degree 约75℃, therefore for temperature degree especially 敏感, temperature degree low easy 脆裂, therefore for/regarding automotive PVC密封 strip/profile production 商而言, improves PVC密封 strip/profile resistant property is 当务之急.

         that 么, how to improve/increase PVC密封 strip/profile resistant property 呢? can from below/following several adjustment formulation.

        1, PVC resin

         resin grade or viscous 数

         analysis:

        PVC resin is types non crystallization, property polymer/macromolecule polymer, its 玻璃化 temperature degree molecular weight large small is 75~105ºC, polymerization degree large, versus for separation quality large, viscous high. high polymerization degree PVC has ratio 常规PVC resin large crystallization degree and type crosslinked structure, make large separation sliding difficult, elastic property increase, meanwhile molecular weight increase large, separation 子间范德华 force and separation inner chemical combined force increase obtain excellent resistant property.

        建议:

         in 常规PVC formulation in, 如 需应付北方冬季寒 cold gas 候, can using/adopting viscous high, and polymerization degree relatively large resin. in 一 特殊 requirements products in, can resistant -25ºC, can selection high polymerization degree polyvinyl chloride (PVC) resin (平 homopolymer combined degree large 于2000).

        2, increase agent

         increase agent types type and use amount

         types type

         analysis:

         increase agent as is PVC soft products important formulation separation, for soft products property can effect/influence very large, requirements products in low temperature lower use, must selection good increase agent type type.

        建议:

         currently as is resistant property increase agent use main/primary has acid binary acid ester, alcohol 邻苯二甲 acid ester, binary alcohol acid ester and other. 据报道, ring 烷二羧 acid ester, chlorine oxygen 基脂肪 acid ester and other, is low temperature property can excellent resistant increase agent.

         use amount

         analysis:

         improve/increase PVC soft products resistant property, generally can through increase resistant increase agent use amount obtain. DOA(adipic acid ester), DIDA(adipic acid 二异癸 ester), DOZ(壬二 acid ester), DOS(癸二 acid ester) is as is resistant increase agent use table/sheet property product types.

        建议:

         due to generally resistant increase agent and PVC versus property 都不十 separation good, upper can as is improvement resistant property increase agent use, its use amount usually is increase agent 5~20%.

        3,   modifier   

        改进PVC low temperature property can has method is add 入玻璃化 temperature degree relatively low, in room temperature lower high elastic property high poly material, is modifier. its in add high poly material and PVC has versus solvent understanding degree parameters, has 一定互 solvent can force, can formed structure blending material, from improvement products low temperature impact strong/high degree. commonly used modifier has CPE(chlorine polyethylene (PE)), NBR(powder 末丁腈橡胶), EVA, ACR(polyvinyl chloride (PVC)), ABS, SBS and other.

         analysis:

        CPE can improve/increase products low temperature property can, impact strong/high degree and other. CPE use amount increase, PV C products impact property can 会逐渐 improve/increase. use amount increase to 一定程 degree 时, PVC products low temperature impact property can 会趋于 stability, in 8, 9份 left right to combined property can price ratio.

        NBR随 use amount increase, make hard PVC low temperature impact strong/high degree improve/increase.

        EVA flow property can very good, 玻璃化 temperature degree low, low temperature toughened good, cost high.

        ACR has excellent low temperature impact strong/high degree and resistant property can, can improvement products appearance, generally add 入5份就 can to very good 效果.

        MBS 玻璃化 temperature degree relatively low, for PVC材 material low temperature property has good improvement function, weather resistance 差.

        ABS can improve/increase PVC材 material low temperature impact strong/high degree, meanwhile improvement products appearance.

        SBS and other 一 含 has versus, tool has relatively low 玻璃化 temperature degree material 质, has improve/increase PVC impact strong/high degree and resistant property function.

        4, filling agent  

         analysis:

         filling agent for soft 质PVC resistant property effect/influence and its increase agent absorption amount has 关, generally trend is increase agent absorption amount small filling agent for resistant property effect/influence small, therefore 炭黑, hard 质陶土 and other increase agent absorption amount large filling agent, make PVC resistant property has comparison obvious reduce.

         filling agent nano carbon acid 钙, ultra- fine carbon acid 钙 添 add, due to small dimensions 效应, tool has similar modifier function, can in use amount scope/range inner improvement PVC材 material low temperature property can, due to has low 玻璃化 temperature degree, 效果没 has modifier obvious, but also add to amount rear, material low temperature property upper rise.

        总之, through below/following series formulation adjustment method, can make PVC材 material resistant property can improves, to low temperature use requirements:

        1. selection combined grade, polymerization degree resin

        2. 选/换 use resistant property more excellent increase agent and combined use amount

        3. 引入一 tool has resistant function polymer modifier

        4. add increase agent absorption amount small filling agent

         meanwhile, processing temperature degree, cooling temperature degree, speed rate, structure design and other for PVC products resistant property generate effect/influence. therefore, in design PVC formulation 时, need will application conditions, products structure, processing equipment, process conditions and other 各方面 factors, formulation comprehensive 考虑, through experiment/testing versus adjustment, most obtain tool has excellent resistant property can PVC formulation.