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What problems should be paid attention to when it comes to heat resistant ABS injection molding?
- Jan 08, 2018 -

Ordinary ABS heat resistant performance is not good enough, now, by adding ɑ - and N - phenyl methyl styrene copolymer heat resistant agent such as maleic imide copolymer developed a series of heat-resistant ABS resin, thermal deformation temperature (HDT) 90-120 ℃.

Due to the molecular structure of the heat resistant ABS containing high rigidity of benzene and N - phenyl groups, improve the heat resistance at the same time, also increased the space steric effect of the molecular chain, reduce the relaxation of molecular chain speed, easy to make the internal stress of products there is a big, lead to products stress cracking, stress white, defects such as brittle.Therefore, reducing the internal stress of the product is the key to the injection molding of heat-resistant ABS.

The thickness of the product wall is equal to one, and the thickness difference of ABS products should be controlled at 25%, so that the thickness of the wall is not too large and the local stress concentration can be caused.The base of the weak pillar needs to increase the R Angle or add reinforcement to prevent the column from breaking.

Card buckle design, card buckle roots need to pour the R Angle, the size of the R Angle depends on the thickness of the product, R Angle and wall thickness ratio should be above 0.3, with the increase of the ratio, the internal stress reduced gradually, but also want to consider product surface shrinkage problem.The design of die cooling watercourse should ensure the uniformity of cooling, avoiding the internal stress caused by uneven cooling and different shrinkage.

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