In the electrical equipment, the flame-retardant sponge rubber can play the dual role of attracting shock absorption and preventing the fire from spreading in the crisis. It puts high requirements on the insulation, flame retardancy and sealing of the rubber compound, generally with natural rubber as the main Raw materials and a certain proportion of tire tread reclaimed rubber can not only improve the processing performance of flame retardant sponge rubber, improve the aging resistance of flame retardant rubber products, but also reduce the raw material cost and production cost of flame retardant sponge rubber products. Then, what kind of problems should be paid attention to after mixing a certain proportion of reclaimed rubber in the flame retardant sponge rubber product?
1. Flame retardant sponge rubber compound selection technique with tread reclaimed rubber
The quality of rubber directly determines the process performance and finished product quality of flame retardant sponge rubber. When using tire tread reclaimed rubber in flame retardant sponge rubber with natural rubber as the main material, it is best to choose 900-1200 waste tire tread rubber powder processing. Made of tread reclaimed rubber, this kind of reclaimed rubber product has higher glue content, better elasticity, better tear strength and wear resistance; in order to ensure smooth foaming of flame retardant sponge rubber, tires of 60 mesh or more Recycled rubber is the best choice, and the amount of rubber tread reclaimed rubber is controlled at 20-30 parts.
2. Flame retardant sponge rubber formula design technique with tread reclaimed rubber
Reasonable rubber product formula can further play the role of rubber raw materials, and can also make up for the defects of rubber raw materials. Research shows that if the reclaimed rubber is directly added to the formula of pure natural rubber flame retardant rubber products without adjusting the formula, the products will be The index is obviously reduced; the original flame retardant sponge rubber formula is adjusted, and the relationship between the vulcanization speed of the flame retardant sponge rubber compound and the foaming speed is coordinated, and the use of the rubber compound can significantly improve the oxidation resistance, heat resistance, weather resistance and ozone resistance of the rubber compound. The cracking anti-aging agent uses a synergistic flame retardant to maximize the performance and service life of the reclaimed rubber flame retardant sponge rubber product.
3. Flame retardant sponge rubber mixing technology with tread reclaimed rubber
When the natural rubber and the tread reclaimed rubber are used together to produce the flame-retardant sponge rubber product, the natural rubber needs to be plasticized to a certain degree of plasticity, and then the ultra-fine tread reclaimed rubber is uniformly mixed, and the accelerator is uniformly dispersed in the mixed rubber; After that, the roll distance of the rubber mixer is enlarged, and other compounding agents other than sulfur are added, and evenly dispersed, sulfur is uniformly mixed; after the compounding agent is added and mixed, the roll gap can be reduced, and the roll distance can be enlarged. Evenly lower the piece.
4. Curing process of flame retardant sponge rubber containing tread reclaimed rubber
Vulcanization is another important process in the production of rubber products. The weighing of semi-finished rubber compound will directly affect the quality of flame-retardant sponge rubber products to a certain extent. Flame-retardant sponge rubber containing reclaimed rubber needs to be determined before vulcanization. The amount of vulcanization, vulcanization, and vulcanization pressure is strictly controlled according to the size of the rubber product, the rubber characteristics, and the type of the compounding agent in the formulation.
5. Extrusion type flame retardant sponge rubber molding technology with tread reclaimed rubber
Flame-retardant sponge rubber products have various shapes. Generally, extruded flame-retardant sponge rubber products need to strictly control the quality, plasticity and mixing degree of rubber materials, such as natural rubber/tread reclaimed rubber and rubber plasticity. The uneven mixing degree of the rubber mixture and the insufficient heat refining will lead to the unstable size of the extruded flame retardant rubber product; the increase of the extruder head and the rubber temperature can reduce the natural rubber/tread reclaimed rubber and the fluidity of the rubber. Reduce the shrinkage rate of the rubber compound and prevent the scorch of the rubber compound, but the extrusion temperature should not be too high; the extruded reclaimed rubber flame retardant sponge rubber after molding needs to be sufficiently cooled to avoid deformation of the flame retardant sponge rubber.
Use tread reclaimed rubber in the production of natural rubber flame retardant sponge rubber products. What other skills are needed?