Nitrile recycled rubber has excellent oil resistance, wear resistance, and good heat resistance, and can be used alone or in combination with nitrile rubber to produce sponge rubber, effectively reducing the cost of raw materials. Nitrile sponge compound combines the oil resistance and heat resistance of nitrile rubber with the lightweight and cushioning properties of sponge structure, and is widely used in the automotive industry, electronic and electrical equipment, industrial sealing and shock absorption, building insulation, sports equipment and other fields. When using nitrile recycled rubber to reduce the cost of sponge rubber, you need to pay attention to the following points.
1. The vulcanization process is selected according to the pore structure of nitrile recycled rubber sponge glue
Nitrile rubber, nitrile recycled rubber sponge compound can be divided into double hole sponge rubber and single-hole sponge rubber according to the pore structure. The two-hole sponge glue is to add the blowing agent to the rubber material during the mixing of rubber, and the low-pressure forming section of vulcanization method is adopted. Single-hole sponge adhesive usually uses a two-stage vulcanization method of high-pressure molding and vulcanization and then heating and expansion.
2. Key points of the design of the foam system for the production of sponge glue with nitrile recycled rubber
Rubber blowing agents can be divided into organic blowing agents and inorganic blowing agents. When using nitrile recycled rubber as the main raw material to prepare sponge glue, commonly used inorganic blowing agents include sodium bicarbonate, ammonium carbonate, acid ammonium carbonate and other E5LYY113, which are used together with stearic acid, oleic acid and other higher fatty acids and benzoic acid to help foaming. Organic foaming agents include diazoaminobenzene, blowing agent AIBN, blowing agent H, blowing agent BSH, blowing agent OBSH, etc., sponge glue bubbles are fine and uniform quality, but the price is higher.
When choosing a foaming agent for nitrile recycled adhesive sponge glue, it is recommended to use a foaming agent with large porosity capacity; When making sponge glue, it is recommended to use a blowing agent that decomposes to produce carbon dioxide, and sodium bicarbonate can be used together with alum. It is recommended to use organic blowing agent that produces nitrogen gas, and the nitrogen pressure in the bubbles is similar to the partial pressure of nitrogen in the atmosphere, so the bubbles do not shrink for a long time.
3. Key points of the design of the vulcanization system for the production of sponge rubber in nitrile recycled rubber
When using nitrile recycled rubber to prepare sponge rubber, it is recommended to use delayed accelerators, such as accelerators TMTM, CZ, NOBS, etc.; When using accelerator DM, it is recommended to use a small amount of anti-coke agent such as anti-scorch NA.
4. Key points of the design of the plasticization system for the production of sponge rubber in nitrile recycled rubber
When preparing sponge rubber using Mooney's highly viscous nitrile rubber or nitrile recycled rubber, it is recommended to add 20 to 50 parts of liquid nitrile rubber, low-viscosity softener, or liquid polybutadiene oligomers to improve the fluidity and plasticity of the compound.
When using nitrile recycled rubber to produce low-cost sponge rubber products, we must reasonably design the formula, especially the combination of vulcanization system and foaming system, and later share with you the formula of nitrile recycled rubber, nitrile rubber/nitrile recycled rubber and use to produce sponge rubber.
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