Chlorinated butyl reclaimed rubber is mainly made from discarded chlorinated butyl rubber products, processed through multiple steps including crushing, softening, desulfurization, glue filtering, and refining. It possesses the basic characteristics of chlorinated butyl rubber: high airtightness, heat resistance, ozone resistance, and good flexural resistance. It can be used together with butyl rubber, natural rubber, styrene-butadiene rubber, cis-butadiene rubber, EPDM rubber, and others to produce rubber products, reducing raw material costs and improving the processing performance of the rubber material. When chlorinated butyl reclaimed rubber is used together with other rubbers, the choice of vulcanization system is crucial.
1. Selection techniques for vulcanization systems using a combination of chlorinated butyl reclaimed rubber and butyl rubber
Butyl chloride reclaimed rubber can be used with butyl rubber in any ratio. Common vulcanization systems include sulfur, sulfur donor, resin, and quinoxime. When producing conventional pressure rubber products E6LYY428 using chlorinated butyl reclaimed rubber together with butyl rubber, a conventional sulfur vulcanization system can be used, which has good physical and mechanical properties; If chlorinated butyl reclaimed rubber products require high heat resistance, sulfur donors or resin vulcanization systems can be tried, as vulcanized rubber has better heat resistance; The quinoxime vulcanization system has minimal impact on the vulcanization rate of butyl rubber/chlorinated butyl reclaimed rubber and combined rubber, making it suitable for scenarios where vulcanization speed adjustment is not required.
2. Selection techniques for vulcanization systems combining chlorinated butyl reclaimed rubber and natural rubber
Adding natural rubber appropriately to chlorinated butyl reclaimed rubber products can improve vulcanized rubber's low-temperature performance; Adding chlorobutyl reclaimed rubber to natural rubber products can improve the vulcanized rubber's ozone resistance, heat resistance, and airtightness. When chlorinated butyl reclaimed rubber is used together with natural rubber, sulfur vulcanization systems and TMTD sulfur carrier vulcanization are commonly used; For rubber products requiring high strength and elasticity, sulfur vulcanization systems should be preferred, using accelerators DM and CZ combined with sulfur; The TMTD system has a fast vulcanization speed and high efficiency.
3. Selection techniques for vulcanization systems using a combination of butyl chloride reclaimed rubber and styrene-butadiene rubber
When chlorinated butyl reclaimed rubber is used together with styrene-butadiene rubber, the vulcanization system design must be determined based on the performance requirements of the rubber product (such as mechanical strength, resistance to thermal oxidation aging, flexural resistance, etc.).
The combined rubber for chlorinated butyl reclaimed rubber and styrene-butadiene rubber uses a conventional sulfur vulcanization system. The sulfur combined with accelerator CZ has excellent overall performance, achieving high tensile strength and suitable elongation at break; It is recommended to control the sulfur dosage at 0.5-1 part, and combined with the delay-acting accelerator DOTG, the heat resistance and flexural resistance of the compound can be further optimized. Using the DPTT-TMTD vulcanization system for sulfur injections, the chlorinated butyl reclaimed rubber/styrene-butadiene rubber combined adhesive vulcanizing rubber has better heat and flex resistance, and the mechanical retention rate after hot air aging is higher.
4. Techniques for selecting vulcanization systems using a combination of chlorinated butyl reclaimed rubber and cis-butadiene rubber
Chlorobutyl reclaimed rubber has excellent airtightness, high energy absorption, and good heat resistance, while cis-butadiene rubber has high elasticity, low heat generation, and good low-temperature performance. Using both together can achieve complementary performance. Combined rubbers for chlorinated butyl reclaimed rubber and cis-butadiene rubber can use sulfur-TMTD vulcanization systems (vulcanizing rubber has good tensile strength, elongation at break, and wear resistance), resin vulcanization systems (vulcanized rubber has good heat resistance, resistance to vulcanization reversion, and low compression set), and zinc oxide-resin composite systems (vulcanizing rubber has excellent dynamic and heat resistance).
5. Selection techniques for vulcanization systems using chlorinated butyl reclaimed rubber and EPDM rubber
Chlorinated butyl reclaimed rubber can be used together with EPDM rubber, leveraging complementary aging mechanisms to significantly improve aging resistance and heat stability, while improving processing performance and significantly reducing raw material costs through excellent compatibility. Combined Rubber for Butyl Chloride Reclaimed Rubber / EPDM Rubber Can use various vulcanization systems such as sulfur and peroxide. The combined rubber has outstanding heat and flex resistance, eliminates rubber bubbles, and optimizes rolling performance. Under the sulfur vulcanization system, adjusting the ratio of two types of rubber can control the hardness, constant tensile stress, and elongation at break to meet the mechanical requirements of different products.
In actual production, butyl chloride reclaimed rubber can also be used together with nitrile rubber, neoprene, butyl reclaimed rubber, and EPDM reclaimed rubber. In the future, I will continue to share with you the key points of various rubber products and vulcanization system designs produced by combining chlorobutyl reclaimed rubber with other rubbers.
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