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??&Solution polymerization&. High cis polybutadiene rubber (cis %%, nickel, cobalt, rare earth catalyst). Low cis polybutadiene rubber (cis %%, lithium catalyst)
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??&. Ultra-high cis polybutadiene rubber (cis % or more)
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??&． Low vinyl polybutadiene rubber (vinyl%, cis%)
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??&． Medium vinyl polybutadiene rubber (vinyl%%)
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??&． High vinyl polybutadiene rubber (vinyl% or above)
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??&. Low trans polybutadiene rubber (trans %, cis %)
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??&． Trans polybutadiene rubber (trans % or more, non-rubbery at room temperature)
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??&Emulsion poly&Emulsion polybutadiene rubber
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??&Bulk polymerization&sodium butadiene rubber (obsolete)
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??&The structure of cis-butadiene rubber contains cis-butadiene rubber, the structure is %~%, trans, the structure is % ~%structure%~%. Butadiene rubber is a crystalline rubber, but its crystallization ability is not strong, so its self-reinforcing ability is small. In addition, the crystallization sensitivity of butadiene rubber is low, which is one of the reasons why the self-reinforcement of butadiene rubber is much lower than that of natural rubber.
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??&Performances of butadiene rubber Since the molecular structure of butadiene rubber is mainly cis, structure and regular molecular arrangement, its elasticity is better than that of natural rubber. The glass transition temperature of butadiene rubber = ℃, so its low-temperature physical properties are very good, and the cold-resistant temperature is lower than ℃. Elasticity is the best among all-purpose rubbers. The heat resistance is the same as that of natural rubber, both at ℃, but the heat aging resistance is better than that of natural rubber. The tensile strength is lower than that of natural rubber and styrene-butadiene rubber, so reinforcing agents such as carbon black must be added. The tear strength is also lower than that of natural rubber, and the wet skid resistance is not good. When used in tire treads and shoe soles, it is prone to slipping on wet roads. Butadiene rubber has excellent wear resistance, small hysteresis loss and low heat generation,
which is very beneficial to the reduction of heat generation and permanent deformation of the product under multiple deformations.
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??& Butadiene rubber does not need to be masticated before mixing. The rubber compound has good extrusion performance and is suitable for injection molding, but has poor adhesion. Butadiene rubber is more sensitive to changes in processing temperature. When the roller temperature of the open mill is above ℃, the rubber material is easy to come off the roller, which brings certain difficulties to processing. Generally, it needs to be used together with natural rubber or styrene-butadiene rubber to improve process performance. Butadiene rubber has greater cold flow, which places higher requirements on the packaging, storage and storage of raw rubber and semi-finished products.
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??&&Butadiene rubber is mainly used to make tires. It can also be used to make wear-resistant products (such as rubber shoes, rubber rollers), cold-resistant products and shock-proof products. It can be used as a modification of plastics. Sexual agent. Butadiene rubber can be used with a variety of rubbers. When manufacturing passenger car wheels, it can be used together with styrene-butadiene rubber at a dosage of %~%. When manufacturing truck tire treads, it is often used together with natural rubber, and the dosage is %~%. When used in heavy-duty off-road vehicle tire treads, natural rubber and butadiene rubber are better. When used for tape, it is generally used together with styrene-butadiene rubber, and the dosage is %~%. When used in the manufacture of tire sidewalls, it can be used together with neoprene to improve low temperature resistance. Butadiene rubber can also be used together with chlorosulfonated polyethylene.
Automotive interior sheet extruder production video.d.qq/.?d=&=
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