Shanghai Daoqin Plastics Co., Ltd.

PC/ABS is property can most excellent, application most plastics alloy 之一, how to made as high toughness PC/ABS is 一 受 to 广泛关注 issues. lower will high toughness PC/ABS formulation design 一 原则, main/primary amount factors has PC molecular weight, ABS and its content, PC/ABS blending ratio/proportion, reaction type compatibilizer and other. 首先我们讨论PC molecular weight for its and PC/ABS tough property effect/influence .

选取四 types different molecular weight PC: PC3.6（Mw=3.6万) PC3.2（Mw=3.2万） PC2.4（Mw=2.4万）PC2.0（Mw=2.0万）进行 research. 我们都知道PC for thick degree and is relatively is 敏感, that 么敏感 程 degree to how to 呢?

由图1, PC样 strip/profile thick degree 由3.18mm increase to 6.35mm时, molecular weight PC notched impact strength value decline is 原 20%-25% left right. will strip/profile 缺口由 standards 缺口改 is 尖锐缺口（ use thin in standards 缺口底部切入）时, impact strong/high degree value large decline, 3.18mm样 strip/profile 各PC decline to 不足原 10%;而6.35mm样 strip/profile 尖锐缺口 impact value decline to standards 缺口 1/5 left right, performance property. can 见, PC for thick degree, especially is has relatively strong/high property, PC molecular weight relatively high this type of property has decrease low.

for/regarding has low temperature tough property requirements material 说, tough temperature degree is important parameters, PC molecular weight for its tough temperature degree has important effect/influence. 由图2, in PC molecular weight relatively high 时, its tough temperature degree molecular weight decline rise high obvious, 如PC molecular weight 由 3.6万 decline to 3.2万时, its temperature degree 由 -42℃ improves 2℃ to -40℃;

而PC molecular weight decline to in and other molecular weight below/following （≤2.4万）时, its tough temperature degree fast speed upper rise, 由PC2.4 -30℃ upper rise 20℃ to PC2.0 -10℃. can 见, need made low temperature tough property relatively good PC, maintain PC relatively high molecular weight is very has necessary.

that 么, different molecular weight PC for PC/ABS alloy impact strong/high degree and low temperature tough property has what effect/influence 呢? will molecular weight PC and content is 16% ABS以70/30 ratio/proportion blending made alloy, its 3.18mm缺口 impact property can lower 图.

由图 can 见, PC molecular weight high, its for 应PC/ABS notched impact strength high, 发生脆 tough temperature degree low. PC molecular weight relatively low 时候, its for 应PC/ABS impact strong/high degree temperature degree reduce decline speed degree very fast.

如 normal temperature （25℃）时, PC3.6, PC3.2 and PC2.4 for PC/ABS notched impact strength separation is 800J/m, 750J/m and 600J/m,而 in -10℃时, its for value separation is 750J/m, 600J/m and 200J/m, PC2.4/ABS impact decline obvious.

therefore, need made as high impact strong/high degree PC/ABS, especially is for low temperature impact has requirements 时, 一方面 is amount selection molecular weight relatively high PC raw materials, 另一方面 is amount decrease/reduce PC/ABS processing process in degradation, anti 止PC molecular weight decline .

本文 源于 micro 信订阅号: versus technology forum ●佳 easy 容