Frosting is one of the most common problems in the production of rubber products, and spraying of compounding agents is one of them. Excessive amount of compounding agent, poor compatibility of compounding agent with rubber and other factors will cause the compounding agent to spray out of the surface of the rubber product, affecting the appearance and performance of the rubber product. So how to solve this problem in actual production? Today I will share with you the reasons and solutions for several common compounding agents in the rubber.
1. Causes and solutions of sulfur spraying in rubber products
Sulfur, as the most traditional vulcanizing agent in the rubber products industry, is widely used in various rubber products. The main cause of sulfur ejection is that the amount of sulfur in rubber products exceeds its solubility in rubber. There are three ways to solve this problem.
(1) Controlling the amount of sulfur: When using a sulfur vulcanization system, the amount of sulfur in rubber products is generally controlled at 1.5-2.5 parts. Due to the different solubility of sulfur in different types of rubber, rubber product manufacturers need to reasonably control the amount of sulfur according to the type of rubber raw material. For example, the amount of ethylene-propylene rubber products in the production process usually cannot exceed two or two.
(2) Use of insoluble sulfur
Compared with ordinary sulfur, insoluble sulfur exists in the rubber in a dispersed state, which can effectively resist the accumulation of sulfur in the rubber, avoid scorching of the rubber, and reduce the scorch tendency of the rubber. Therefore, rubber product manufacturers can use insoluble sulfur 2LLYY0319 when the cost, production equipment, and process parameters allow, to prevent sulfur from spraying out of the rubber product surface.
(3) Choose semi-effective vulcanization system or effective vulcanization system
When the solubility of sulfur in a certain rubber is very low and sulfur must be used to improve the performance of vulcanizates, rubber product manufacturers can abandon the traditional sulfur vulcanization system and choose an effective vulcanization system or a semi-effective vulcanization system. The amount of sulfur is controlled to less than 1 part Sulfur ejection will not occur.
2. Reasons and solutions for the accelerator spraying in rubber products
Rubber accelerator is indispensable in the production of rubber products. Its solubility in non-polar saturated rubber such as ethylene-propylene rubber is very small, and it is easy to cause ejection problems. At this time, rubber product manufacturers can choose to mix two or more kinds. The combination of additives can effectively solve the problem that the compounding agent sprays out the surface of rubber products.
Other types of compounding agents are also used in the production of rubber products, such as reinforcing fillers, antioxidants, softening plasticizers, etc. What should be done if such compounding agents are sprayed on the surface of rubber products, and how can rubber product manufacturers effectively avoid them The above compounding agent precipitates on the surface of the product? I will discuss with you later.