Thermoplastic styrene butadiene rubber has four main uses: rubber products, asphalt modifier, adhesive and resin modifier. In terms of rubber products, it is suitable for manufacturing shoe soles, glass door and window sealant strips, rubber plates, gaskets, rubber hoses and tapes. As a resin modifier, SBS blends with PP, PE and PS can significantly improve the low-temperature properties and impact resistance of products. SBS used in adhesives has the characteristics of high solid content, quick drying and low-temperature resistance; As a pavement asphalt modifier, SBS can significantly improve the weatherability and load resistance of asphalt.
The molecular chain of thermoplastic elastomer of thermoplastic styrene butadiene rubber is composed of resin segment (hard segment) and rubber segment (soft segment) with different chemical composition. The force between the hard segments is enough to form "physical crosslinking", while the soft segment is a highly elastic segment with greater free internal rotation; The soft and hard segments are arranged in appropriate order and connected in appropriate ways.
The physical crosslinking of hard segment is reversible, that is, it loses the ability to restrict the composition of macromolecules at high temperature and presents plasticity. When the temperature drops to room temperature, these "crosslinks" resume, playing a role similar to the crosslinking point of vulcanized rubber. Because of the chain structure and the reversibility of crosslinking state of thermoplastic elastomer, it shows the physical and mechanical properties such as elasticity, strength and deformation of vulcanizate at room temperature, and can replace the traditional vulcanizate to manufacture some rubber products.
The hard segment will soften or melt under high temperature, and show viscous flow under pressure, showing the processing characteristics of thermoplastic. Injection molding, blow molding and other thermoplastic methods can be used, which has faster compression, extrusion and calendering molding speed, shorter cycle, less post vulcanization equipment and lower production cost than those commonly used for traditional vulcanized rubber.
Potassium hydroxide manufacturers believe that thermoplastic elastomers can also be processed quickly and economically by vacuum, blow molding and other methods that traditional rubber cannot use. Repeated processing has no obvious damage to its performance or processing characteristics. Waste products and leftover materials can be reprocessed. Used materials can be used together with new materials, which greatly improves the utilization rate of materials and greatly reduces environmental pollution. It is considered as an environmentally friendly material.
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