Extrusion & Post
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Rubber migration/exudation of high impact polystyrene HIPS products
Problem Phenomenon
Rubber migration or exudation appears on the surface of HIPS products, surface becomes sticky or discolored, affecting product appearance and printing performance.
Cause Analysis
(1) Rubber content too high or poor compatibility with the base material
(2) Processing temperature too high, rubber partially degrades and migrates
(3) High product storage temperature accelerates rubber migration
(4) Rubber particle size too large, easy to migrate
(5) Interaction between additives and rubber promotes migration
Solution
(1) Select grades with appropriate rubber content and compatibility
(2) Control processing temperature within the 180-240°C range
(3) Product storage temperature not exceeding 40°C
(4) Select grades with small rubber particle size
(5) Reduce additives that may interact with rubber
Key Takeaway
HIPS rubber exudation is caused by compatibility and temperature.
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