Development status of HIPS particles

HIPS development status: In the past ten years, the noticeable development of high-performance varieties in foreign HIPS Compound series has been the emergence of a new group of "EHPS", which some suppliers call "high-grade styrene" resin. The main feature of this type of product is the combination of high impact resistance and high gloss, and its application direction is positioned in the field of ABS products with low impact and gloss;
There are also some new materials for medium performance HIPS, including super-tough grades, high flowability flame retardant products and grades with improved chemical resistance and environmental pressure cracking performance;
Flame Retardant Fireproof HIPS
Flame Retardant Fireproof HIPS
In general performance products, the general crystalline polystyrene monomer continues to decrease, reducing the odor in food packaging applications, so it has begun to gain popularity. The development of HIPS products abroad is mainly divided into the following important directions: HIPS with more toughness and glossiness;
HIPS for injection molding; HIPS for sheet use focuses on improving environmental stress crack resistance; flame retardant HIPS tends to have high fluidity;
In response to the domestic market demand for HIPS materials and meeting user requirements for special materials, domestic manufacturers and research units should vigorously develop special grade HIPS resins, and the modification of HIPS mainly focuses on the following development goals:
① High Gloss HIPS: HIPS replaces the more expensive ABS and is used in the shell of electronics and electrical appliances. It not only requires good physical and mechanical properties but also requires that the surface of its products are quite shiny. By changing the particle size and morphology of the rubber, and supplemented with specific additives, the surface gloss can be greatly improved.
② Stress crack resistance HIPS: One of the important problems of HIPS replacing ABS is its stress crack resistance. At present, there is still some distance to completely solve the problem of stress crack resistance.
③Flame Retardant HIPS Granules: On the basis of the HIPS masterbatches that have been successfully developed, it further has the dual properties of flame retardant masterbatches and color masterbatches, expanding its application range and increasing the added value of products.
HIPS performance: HIPS is a copolymer of styrene monomer and polybutadiene rubber grafting reaction. The choice of polybutadiene rubber is the key to making HIPS products, and its amount has a great impact on the performance of HIPS products. With the increase of the amount of rubber, the HIPS rubber particles are more complete, the distribution is more uniform, and the rubber particles gradually decrease. With a certain stirring rate, the amount of rubber is large, and the viscosity of the reaction system is high. At the same time, the sheer force is large at the same stirring rate, so the rubber particles become smaller. As the amount of rubber increases, the volume fraction of the rubber phase in HIPS is not a single increase, but when the rubber content is 5%, the volume fraction of the rubber phase has a large value, and then as the rubber content increases, the volume fraction of the rubber phase decreases.
With the increase in the amount of polybutadiene rubber, the product's elongation at break, impact strength of cantilever beams, impact strength of drop weight, and Vicat softening point all increased to varying degrees, but the tensile strength decreased due to the increase in rubber The amount of the vinyl structure in the reaction system increases, which is conducive to the occurrence of the grafting reaction, thereby increasing the volume fraction of the rubber phase in HIPS and improving the impact performance of the product. But as the number of rubber increases to a certain value, there are too many graft points in the reaction system, and the product is prone to undergo excessive cross-linking reactions to form a network structure. Instead, the modulus of HIPS decreases and the elongation at break decreased.
Our company also has Flame Retardant Fireproof HIPS on sale, welcome to consult.

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