Extrusion & Post
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Rubber migration/exudation of styrene-acrylonitrile copolymer HIPS products
Problem Phenomenon
Rubber migration or exudation appears on the HIPS product surface, with sticky surface or discoloration, affecting product appearance and printing performance.
Cause Analysis
(1) Rubber content is too high or compatibility with the matrix is poor
(2) Processing temperature is too high, and the rubber partially degrades and migrates
(3) Product storage temperature is high, accelerating rubber migration
(4) Rubber particle size is too large, making migration easy
(5) Additives interact with the rubber to promote migration
Solution
(1) Select grades with suitable rubber content and compatibility
(2) Control processing temperature within the 200-260°C range
(3) Product storage temperature does not exceed 40°C
(4) Select grades with small rubber particle size
(5) Reduce additives that may interact with the rubber
Key Takeaway
HIPS rubber exudation is caused by compatibility and temperature.
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