Reclaimed rubber, as a renewable resource for recycling and reuse of waste rubber, can be re-added to the production of rubber products, such as rubber rollers. Rubber rollers are mostly composed of outer rubber, hard rubber layer, metal core, roller neck and vent holes. The rubber part has strict requirements on the rubber used. Natural rubber, butyl rubber, nitrile rubber, etc. can be used to produce rubber rollers. In actual production, the rational use of reclaimed rubber can effectively reduce the raw material cost of rubber rollers; then how to design the formula of rubber rollers containing reclaimed rubber.
1. Design basis of rubber roller formula
When designing the rubber roller formula, the use environment, working conditions, contact medium and other technical requirements of the rubber roller must be comprehensively considered; at the same time, the processing technology of the rubber roller must be taken into account, such as the good self-adhesion of the unvulcanized rubber compound and a reasonable vulcanization curve. The rubber roller formula should be coordinated with the processing technology to better ensure the stability of various indicators of the finished rubber roller.
2. Reclaimed rubber selection skills
When using reclaimed rubber to reduce the production cost of rubber rollers, it is necessary to select suitable reclaimed rubber products according to the use requirements of the rubber roller, especially the pressure, rotational speed, and contact media that the rubber roller needs to withstand during operation. For example, it is recommended to use oil-resistant nitrile reclaimed rubber 22LYY111 in the production of rubber rollers that need to be in contact with oil and aliphatic hydrocarbon solvents, and butyl reclaimed rubber for rubber rollers with high requirements for heat resistance and acid and alkali resistance. Rubber rollers that have requirements on properties and electrical insulation use EPDM reclaimed rubber, etc.
In actual production, reclaimed rubber can be used alone or in combination with original rubber, such as nitrile reclaimed rubber and nitrile rubber, butyl reclaimed rubber and butyl rubber or ethylene-propylene rubber, etc. Lower cost rubber roller products.
3. Design of rubber roller coordination system
When designing the formula of rubber roller containing reclaimed rubber, the variety and amount of compounding agent in the vulcanization system, reinforcing filling system and anti-aging system will affect the mechanical strength and aging performance of the rubber roller.
Take the rice hulling rubber roller as an example: the rice hulling rubber roller is an important part of the rice hulling machine. The two rubber rollers rotate in opposite directions to make the rice enter among the two rollers to squeeze, tear and peel off. To achieve the purpose of shelling rice. Grain hulling rubber rollers generally use nitrile rubber as the main raw material, and nitrile reclaimed rubber can be added in an appropriate amount. When nitrile rubber/reclaimed rubber is used together to produce hulling rubber rollers, sulfur vulcanization can be used together with accelerator DM, etc.; activated silica is used for filling; anti-aging agent MB is mainly used, with a small amount of anti-aging agent RD.
When using reclaimed rubber to reduce the production cost of rubber rollers in different occasions, rubber product manufacturers must comprehensively consider the actual performance requirements and technical specifications of rubber rollers, including mechanical strength, oil resistance, ozone resistance, etc., and reasonably choose the variety of reclaimed rubber and The compounding agent in the vulcanization system, filling system and anti-aging system can reduce the cost of more raw materials on the premise of ensuring product quality.
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