Butyl rubber and butyl reclaimed rubber have good air permeability and heat resistance, and can be used to produce various heat-resistant hoses such as steam hoses. When using butyl rubber/reclaimed rubber to produce heat-resistant hoses, the design of the softening system in the rubber product formulation directly affects the processing performance, elasticity, and heat resistance of the heat-resistant hose, and manufacturers need to be cautious. So what should be paid attention to when choosing softener for butyl heat-resistant hose? Which softeners are suitable for the production of butyl rubber/reclaimed rubber heat-resistant hoses?
1. Precautions for choosing softener for butyl heat-resistant hose
The butyl heat-resistant hose works under high temperature conditions, and the working temperature is likely to exceed 150°C. The use of low-boiling softeners or rubber oil directly affects the performance and life of the heat-resistant hose. Therefore, when choosing softeners for butyl rubber/reclaimed rubber heat-resistant hoses, high-boiling softeners are usually selected, and low-boiling softeners should be avoided as much as possible. When low boiling point softeners must be used, reduce the amount as much as possible; when choosing butyl heat-resistant hose softeners, don't forget to consider the effect of softeners on the heat resistance of the rubber.
2. Types and dosages of softeners commonly used in butyl rubber products
Softeners can improve the handling properties of butyl rubber in butyl rubber products. The vulcanization speed of butyl rubber is slow, and the use of unsaturated softeners such as rosin and pine tar will further delay vulcanization, which will seriously affect the efficiency of vulcanization 2LLYY1014. Therefore, butyl rubber/reclaimed rubber products mostly use saturated softeners, such as paraffin hydrocarbon softeners, aliphatic hydrocarbon softeners or aromatic hydrocarbon softeners, and the amount is generally controlled between 15-30 parts.
3. Types and functions of softeners commonly used in butyl heat-resistant hoses
When using saturated softeners to improve the plasticity, fluidity, and elasticity of butyl rubber/reclaimed rubber heat-resistant hoses, it is recommended to use high boiling point softeners, among which petroleum-based high boiling point softeners such as paraffin oil and paraffin wax are more suitable. In actual production, paraffin oil can reduce the Mooney viscosity of butyl rubber/reclaimed rubber, extend the scorch time of the rubber, and improve the operation process; butyl heat-resistant hose can also be used with high molecular weight, low volatility, low migration and durability. Polyester plasticizer with good properties.
It should be noted that the addition of rubber oil will reduce the tensile strength, tensile stress, hardness, compression and permanent deformation, heat resistance and other indicators of the rubber. Therefore, the petroleum softener in the softening system of butyl rubber/reclaimed rubber heat-resistant hose Do not use too much; use a small amount of polyester plasticizer when necessary to further improve the heat resistance of butyl heat-resistant hose.
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