Sponge rubber is a porous structural material with a hole throughout the material. It has small density, good elasticity and resistance to flexing. It has remarkable shock absorption performance, sound insulation effect and heat insulation performance during use. Oil-resistant sponge rubber products can be used for a long time. It is used in oil medium to maintain good use effect; in the actual production process, oil-resistant sponge rubber products need to be designed according to the characteristics of the rubber used, and the rubber mixing process is selected to ensure uniform foaming of oil-resistant sponge rubber products.
1. Rubber raw materials commonly used in the production of oil-resistant sponge rubber products
Very simple, oil-resistant sponge rubber products naturally use rubber varieties with excellent oil resistance. Nitrile rubber, neoprene rubber, epoxy natural rubber, etc. are common raw materials; many oil-resistant sponge rubber products manufacturers will also use nitrile Rubber and nitrile reclaimed rubber can improve the processing performance of the rubber compound, reduce the cost of raw materials, or use the combination of nitrile rubber and polyvinyl chloride to further improve the comprehensive performance of the oil-resistant sponge rubber products.
2. Rubber mixing process of oil resistant sponge rubber products
Among the rubber products suitable for the production of oil-resistant rubber products, nitrile rubber is the most commonly used. NBR is made of emulsion polymerization of butadiene and acrylonitrile. It has excellent oil resistance and is an ideal raw material for oil-resistant sponge rubber products. However, the nitrile rubber itself has a large Mooney viscosity and is difficult to masticate. Therefore, nitrile rubber is the main material. When producing raw materials for oil-resistant sponge rubber products, it is best for rubber products manufacturers to use three-stage or four-stage mastication, and the number of thin passes is increased to 40-60 times. At present, many oil-resistant sponge rubber products manufacturers choose to use the appropriate amount of nitrile reclaimed rubber in the nitrile sponge products. Xiao Bian thinks this is a good method.
The nitrile reclaimed rubber is processed from nitrile water gel, sub-brand nitrile rubber or waste nitrile rubber products. It retains the basic performance characteristics of nitrile rubber, and has high oil resistance coefficient. The price is much lower than that of nitrile rubber. Or partial replacement of nitrile rubber to produce oil-resistant sponge rubber products can significantly reduce the cost of raw materials, this is one; nitrile reclaimed rubber in the production process through desulfurization, refining molding and other processes, plasticity, fluidity is better than nitrile rubber, with To produce oil-resistant sponge rubber products can improve the performance of nitrile rubber compounding process and reduce production energy consumption.
3. Vulcanization process and foaming process of oil resistant sponge rubber products
The vulcanization process has a great influence on the quality of the oil-resistant sponge rubber products. The foaming is generally carried out simultaneously with the vulcanization. It is necessary to pay attention to the following three points: 1 The vulcanization speed is matched with the foaming speed, and the oil vulcanization sponge is generally matched by adjusting the vulcanization system and the vulcanization process conditions. The foaming speed of the product; 2 the heat transfer property is good during vulcanization, ensuring uniform inner and outer cells, uniform vulcanization degree, low temperature long-term vulcanization is better than high temperature rapid vulcanization; 3 the pressure generated inside the rubber compound should be greater than the external pressure.
The quality of oil-resistant sponge rubber products has a lot to do with the variety of rubber compounds, formula design and the completion of production process. Later, Xiaobian will continue to discuss with you about the production of oil-resistant sponge rubber products.