Cemented rubber is the product of the combination of rubber hydrocarbons and a large amount of sulfur, and diene rubbers such as natural rubber, styrene-butadiene rubber, and nitrile rubber can be prepared with sulfur. Hard rubber has a hard texture and good electrical insulation. Nitrile recycled rubber retains the basic performance characteristics of nitrile rubber, with excellent oil resistance and wear resistance, and can replace some nitrile raw rubber to produce hard rubber products, effectively reducing raw material costs.
1. The application of nitrile recycled rubber in cemented glue
Nitrile recycled rubber can be used alone to produce hard rubber products, such as valve seals, effectively reducing the cost of raw rubber; When hard glue has high requirements for mechanical strength, oil resistance, wear resistance, etc., nitrile rubber and nitrile recycled rubber are used together to further improve the comprehensive performance of the finished product while reducing production costs. In actual production, nitrile recycled rubber and nitrile rubber can also be used in conjunction with phenolic resin and polyvinyl chloride to improve the heat resistance, weather resistance, and solvent resistance of hard rubber products.
2. Key points of the formula design of rigid glue prepared by nitrile recycled glue
(1) Vulcanization system: When using nitrile recycled rubber, nitrile recycled rubber/recycled rubber to produce hard rubber products, the amount of sulfur is generally controlled below 50 parts, and the amount is too high and easy to burn.
(2) Filling system
When producing hard rubber with nitrile rubber, nitrile recycled rubber or nitrile rubber/recycled rubber as the main raw materials, commonly used fillers include iron oxide, hard rubber powder, calcium carbonate, terracotta, etc.
Iron oxide can improve the processing process performance of rubber materials, give good viscosity and fluidity to rubber materials, and improve the tensile strength, impact strength, softening temperature E5LYY319 of hard rubber products. The effects of zinc oxide and iron oxide are basically the same. Nitrile rubber hard rubber powder can increase the tensile strength of the compound, increase the softening temperature, and improve the processing process performance of the compound. Calcium carbonate can increase the softening temperature of the compound, increase the impact strength of the hard adhesive, and reduce the cost. Clay is easy to shape and process, and has good acid resistance.
(3) Soften the system
When producing hard rubber products with nitrile recycled rubber, the appropriate use of softeners can improve the processing performance of rubber mixing, extrusion, molding and other processes, and increase the viscosity of the rubber material, generally about 10-15 parts; Volatile softeners are prone to pores and are not suitable for use. In the formulation of nitrile recycled rubber hard compound, the most commonly used softener is dibutylcresol, which improves the tensile strength, impact strength and viscosity of the compound. Dimer oil can improve tensile and impact strength; Coal tar and pine resin can increase the softening temperature; When ester plasticizers such as dibutyl phthalate and trixylene phosphate are used together with dibutyl cresol, coal tar and coumarone resin, the rubber is easy to process.
3. Nitrile rubber/nitrile recycled rubber is used to prepare hard rubber formulas
70 parts of nitrile rubber, 30 parts of nitrile recycled rubber, 75 parts of phenolic resin, 190 parts of terracotta, 20 parts of titanium dioxide, 25 parts of coumerone resin, 2 parts of accelerator DM, 20 parts of sulfur; A total of 432 copies.
When using nitrile recycled rubber to prepare high-performance and low-cost hard rubber, it is not only necessary to choose the appropriate recycled rubber product and design the rigid rubber formula, but also to appropriately adjust the production process parameters, and continue to discuss related issues with you later.
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