Polystyrene plastic (PS) is widely used in manufacturing, packaging, construction, automobile, household appliances and other fields because of its good transparency, high rigidity, low moisture absorption, good formability, electrical insulation and other characteristics. Polystyrene is brittle and has low impact strength, so its application range can be further expanded by toughening and modifying it. Styrene butadiene rubber, cis polybutadiene rubber, EVA, etc. can toughen polystyrene, but the product price is high.
The price of rubber powder (mainly tire rubber powder) processed from waste rubber products is low. It is used for PS toughening modification (commonly used tire rubber powder). The preparation of rubber powder modified polystyrene can not only improve the impact resistance of blends, but also effectively reduce the cost of modified materials. When using rubber powder to toughen polystyrene, coupling agent and toughening agent will be used to improve the toughening effect of rubber powder on polystyrene due to poor interface compatibility among the two.
In actual production, the amount of rubber powder, coupling agent and toughening agent will affect the physical properties of polystyrene blends modified by rubber powder.
1. The ideal amount of rubber powder in the rubber powder modified polystyrene blend
With the increase of the amount of rubber powder, the polystyrene material modified by rubber powder will show toughness, and the impact strength will increase; However, due to the poor compatibility among polystyrene and rubber powder, the impact strength of modified polystyrene decreased when a small amount of rubber powder 2ELYY117 was added. However, the tensile strength of rubber powder modified polystyrene blends decreased with the increase of rubber powder content. In actual production, when the total amount of rubber powder and polystyrene is 100 phr, and the amount of rubber powder is controlled at 20-40 phr, the rubber powder modified polystyrene material will show more ideal physical comprehensive properties.
2. The ideal amount of coupling agent in the rubber powder modified polystyrene blend
When polystyrene is toughened with rubber powder, the surface treatment of rubber powder with coupling agent can improve the interface compatibility among rubber powder and polystyrene, and improve the toughness of polystyrene blend material modified by rubber powder to a certain extent. Titanate coupling agent is commonly used. With the increase of the amount of titanate coupling agent, the impact property of rubber powder modified polystyrene decreased first, then increased and then decreased, and the tensile strength increased first and then decreased. In actual production, when the amount of coupling agent is controlled at about 2 phr, the modified polystyrene blends will show better physical and mechanical properties.
3. Ideal amount of toughening agent in rubber powder modified polystyrene blend
SBS toughening agent is a toughening agent obtained from SBS through modification and granulation. It is applicable to the modification of PS, PP, PE, ABS, PBT and other plastics to improve the toughness, impact strength, bending resistance and low temperature resistance of plastics. When SBS toughening agent is used, the toughness of the modified plastic increases with the decrease of strength and processability; With the increase of the amount of SBS toughening agent, the impact strength of rubber powder modified polystyrene blends decreased first and then increased, and the tensile strength decreased gradually. In actual production, when the amount of SBS toughening agent is controlled at 15-20 phr, the comprehensive physical properties of rubber powder modified polystyrene are better.
From the perspective of modification effect and product price, most of the rubber powder used to toughen polystyrene is about 80 mesh tire powder. Xiaobian will continue to share with you the specific application of the rubber powder modified polystyrene blend material when the opportunity arises.
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