When the reclaimed butadiene acrylonitrile rubber or the reclaimed butadiene acrylonitrile rubber/the reclaimed butadiene acrylonitrile rubber are used alone to produce rubber products, the plasticizer can further improve the elasticity, lubricity, flexibility, plasticity and fluidity of the rubber, facilitating subsequent molding operations. Plasticizers commonly used in the production of reclaimed butadiene acrylonitrile rubber products include dibutyl phthalate, dioctyl phthalate, trimethylbenzene phosphate, etc. The type of plasticizer directly affects the oil resistance, heat resistance and cold resistance of the reclaimed butadiene acrylonitrile rubber compound. It is necessary to select the appropriate plasticizer product according to the application situation and performance requirements of the butadiene acrylonitrile rubber product.
1. Effect of plasticizer on oil resistance of nitrile reclaimed rubber products
When producing rubber products with reclaimed butadiene acrylonitrile rubber as the main raw material, the influence of plasticizer on the oil resistance of rubber material is mainly related to the difficulty of being extracted by petroleum solvent in rubber, and the degree of being extracted depends on the molecular structure of plasticizer. The plasticizer containing alkyl straight chain structure is easy to be extracted, and the plasticizer containing phenyl, ester group and other polar plasticizers is difficult to be extracted. If there are more branches in the alkyl straight chain, the diffusion of plasticizer molecules can be reduced, and the oil resistance of NBR reclaimed rubber vulcanizate is good.
In actual production, butylbenzyl phthalate, trimethylbenzene phosphate and dinonyl phthalate are commonly used plasticizers in the production of oil resistant nitrile butadiene reclaimed rubber products.
2. Effect of plasticizer on heat resistance of NBR reclaimed rubber products
When using nitrile reclaimed rubber to produce heat-resistant rubber products, it is recommended to use plasticizers with high boiling point and low volatility, such as polyester plasticizers or trimethylbenzene phosphate, trioctyl isophthalate, etc.
3. Effect of plasticizer on cold resistance of nitrile reclaimed rubber products
When using nitrile reclaimed rubber to produce rubber products with high requirements for cold resistance, the cold resistance of rubber is related to the chemical structure of plasticizer. If there is a ring structure in the molecule, the molecular movement of rubber method is blocked, and the cold resistance of rubber material is significantly reduced, such as cyclohexyl phthalate, trimethylbenzene phosphate, butylbenzyl phthalate and other plasticizers. It is recommended to use fatty acid esters with the chemical structure of methylene straight chain, such as dioctyl sebacate, dioctyl adipate, etc., to improve the cold resistance of the product of nitrile reclaimed rubber 2ELYY111; There are many branched chains in the molecular structure of plasticizer, and the cold resistance is deteriorated.
In actual production, the influence of plasticizer on cold resistance and oil resistance of NBR reclaimed rubber vulcanizate is contradictory. The cold resistance plasticizer is easy to be drawn out in oil, so the oil resistance is reduced. Polyester plasticizers, due to their large molecular weight, are very stable for solvent extraction, and their main advantages are low volatility and permeability, but they are not ideal for cold resistance, plasticity and compatibility with rubber.
The acrylonitrile content of reclaimed butadiene acrylonitrile rubber and butadiene acrylonitrile rubber is different, and their compatibility with cold resistant plasticizers is also different. For example, the compatibility of common dioctyl adipate, dioctyl sebacate, and didecyl diacetate in butadiene acrylonitrile rubber materials is very different, especially in butadiene acrylonitrile rubber with high acrylonitrile content, it is easy to exude. Later, Xiao Bian continued to share with you the plasticizer matching skills for the production of oil resistant, cold resistant and heat resistant rubber products from nitrile reclaimed rubber.
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