Butyl Rubber Encyclopedia

Tips for blending nitrile rubber in chlorinated butyl rubber products

Create Date:2020-05-06 08:51:14Click volume:247
Tips for blending nitrile rubber in chlorinated butyl rubber products

When chlorinated butyl rubber / reclaimed rubber is used to produce rubber products, the appropriate amount of nitrile rubber compound can significantly improve the oil resistance and wear resistance of the rubber compound; How much is suitable? How to design the formulation of chlorobutyl / nitrile rubber products? The editor today shares with you the reference formulation of chlorinated butyl rubber products blended with nitrile rubber compounds and the blending techniques of nitrile rubber compounds in chlorinated butyl rubber products.

1. Reference formula of chlorinated butyl / butyronitrile compound

Reference formula ①: 50 parts of chlorobutyl rubber, 50 parts of nitrile rubber, 1 part of stearic acid, 5 parts of zinc oxide, 7 parts of phenolic resin, 40 parts of carbon black, 1 part of accelerator, 1 part of antioxidant; total : 155 copies.

Reference formula ②: Chlorobutyl rubber 75 parts, nitrile rubber 25 parts, stearic acid 1 part, zinc oxide 5 parts, phenolic resin 5 parts, carbon black 50 parts, sulfur 2 parts, accelerator 3 parts, antioxidant 1 serving; total: 167 servings.

2. Chlorinated butyl / butyronitrile compound compound ratio

When chlorinated butyl rubber / reclaimed rubber is mixed with nitrile rubber to improve the oil resistance of rubber products, the overall performance of the compound rubber varies with the amount of nitrile rubber mixed. In general, when the amount of nitrile rubber 2LLYY56 is high, the physical properties, oil resistance and ozone resistance of the rubber compound are better. For example, in the reference formula ①, chlorobutyl / nitrile rubber is used in a ratio of 1/1; When the amount of nitrile rubber is low, the airtightness and ozone resistance of the compound are better. For example, refer to the mixing ratio of the two compounds in formula ②.

3. Formula design of chlorobutyl / butyronitrile compound compound

Because the processing performance of chlorinated butyl rubber and nitrile rubber is very different, when the two rubbers are used in different proportions, the vulcanization system directly affects the performance of the compound. When the amount of nitrile rubber in the compound rubber is high, phenol resin can be used for vulcanization alone, and the accelerator TT is used in combination; when the proportion of nitrile rubber is low, the phenol resin / sulfur combination system can be selected to use the accelerator DM as The main accelerator can be combined with a small amount of accelerator D and accelerator DOTG to prepare chlorinated butyl rubber / nitrile rubber rubber with better comprehensive performance.

3. How to coordinate the mechanical strength and cost of chlorobutyl / butyronitrile compound rubber

Reducing the cost of raw materials on the premise of ensuring the quality of rubber products is what rubber product manufacturers most want to see. When chlorinated butyl / butyronitrile rubber is used to produce rubber products, rubber product manufacturers can use recycled rubber (chlorinated butyl recycled rubber or nitrile recycled rubber) in an appropriate amount to reduce the production cost of rubber products, select the appropriate variety of reinforcing agents, Properly increase the amount of reinforcing agent to coordinate the relationship between the physical and mechanical strength of rubber products and cost.

For chlorinated butyl rubber products with high requirements of high and low temperature resistance, thermal conductivity, and constant tensile stress, quick extrusion carbon black can be used to reinforce and further improve the processing performance of the rubber compound; if the hardness is higher, you may wish to try low Structural degree reinforces carbon black.

In the actual production, when chlorinated butyl rubber products are mixed with nitrile rubber compound to improve the comprehensive performance of the rubber compound, there are still many points that need attention. Later editors will continue to discuss with you about the combined use of chlorobutyl / butyronitrile Processing skills and solutions to common problems in the rubber compound preparation process.