Friction materials refer to materials that produce friction in the process of friction,which are widely used in machinery,automobiles,aerospace and other fields. Nitrile butadiene rubber is an industrial rubber with excellent properties,whose strong heat resistance,solvent resistance and tear resistance make it one of the ideal raw materials for friction materials. The traditional nitrile rubber production process will produce a lot of waste,causing serious pollution to the environment;Recycled nitrile rubber powder refers to the powdered substance obtained from the waste nitrile rubber products after processing. Compared with traditional NBR,the recycled NBR powder has the advantages of low cost and environmental protection. Therefore,the application of recycled nitrile rubber powder in friction materials can not only reduce production costs,but also reduce environmental pollution. Therefore,it is of great significance to study the application of recycled nitrile rubber powder in friction materials.
The use of recycled nitrile rubber powder in friction materials can not only improve the friction coefficient and wear resistance of the product,but also expand the temperature range of the product,so as to obtain more excellent performance. The optimization of formula is the key in practical production application. The formula of general nitrile reclaimed rubber powder should include recycled nitrile rubber powder,filler,plasticizer,vulcanizing agent and other components. The types and proportions of fillers have important effects on the properties of friction materials. The commonly used fillers are carbon black,silica fume,talc powder,etc. The role of plasticizer is to increase the flexibility and ductility of the material,the commonly used plasticizer are DOP,DBP,etc. Vulcanizing agent is the curing agent of regenerated nitrile rubber powder,and the commonly used vulcanizing agent is mercaptan,peroxide and so on. In the friction material formulation,the amount of recycled nitrile rubber powder is generally 20-40 parts. If the amount is too high,it will cause the hardness of vulcanized rubber material to be too high,and the processability and toughness to decline;If the dosage is too low,it is difficult to play its excellent performance. Therefore,it is very important to choose the appropriate dosage to play the role of recycled NBR powder.
Recycled nitrile rubber powder can not only be used alone to produce friction materials,but also be blended with other rubbers such as styrene butadiene rubber and neoprene rubber. When blending,it can not only play the synergistic effect of various rubbers,but also obtain better comprehensive properties. It can also reduce costs. When blended with other rubbers,the amount of recycled NBR powder is generally controlled 10-30 parts.
It should be noted that in the actual production process,the nitrile reclaimed rubber powder is relatively loose,which will affect its uniform dispersion in the cross-linking,and special attention should be paid to its dispersion effect in the mixing process. Commonly used compatibilizers and dispersants can help the regeneration of nitrile rubber powder to obtain better dispersion effect,and can also use low-speed mixers,high-speed mixers and other uniform mixing,and the temperature is controlled below 80℃. Considering the polarity characteristics of the reclaimed NBR powder,the choice of silicone oil or resin with similar chemical polarity is also beneficial to its compatibility and dispersion in the crosslinking.
The advantages of recycled nitrile rubber powder in friction materials are as follows:
1、good wear resistance: recycled nitrile rubber powder has excellent wear resistance,and can be used for a long time under harsh conditions such as high speed,high temperature and high pressure.
2、good oil resistance: recycled nitrile rubber powder has excellent oil resistance,and can be used in the oil environment for a long time.
3、good high temperature resistance: recycled nitrile rubber powder has excellent high temperature resistance,can be used in high temperature environment for a long time.
4、environmental protection: recycled nitrile rubber powder is a kind of recycled material,with environmental protection characteristics.
5、low cost: nitrile recycled rubber powder is a recycled material,the cost is relatively low,can reduce manufacturing costs.
The application of recycled nitrile butadiene rubber powder in friction materials is of great significance,and the advantages of recycled nitrile butadiene rubber powder can be fully utilized by optimizing the formula,reducing production costs and reducing environmental pollution. In the future,the application prospect of recycled nitrile rubber powder in the field of friction materials is very broad,and it is worth further research and promotion.
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