Silk black is becoming more and more widespread Used in various industries as additives, catalyst carriers, petrochemicals, decolorizing agents, matting agents, rubber reinforcing agents, plastic fillers, ink thickeners, metal soft polishing agents, insulation fillers, daily cosmetic fillers and Spray materials, medicine, environmental protection and other fields. It also provides new material foundation and technical guarantee for the development of related industrial fields. Today, Kain Chemical will take you to understand the role of various indicators of silica in applications. I hope it will be helpful to you.
1. Specific surface area
The reinforcing effect of white carbon black mainly depends on its specific surface, which generally increases with the specific surface area. Large, all the strength indicators of rubber products are increased, but the resilience is reduced, the tear strength is reduced, and it is not wear-resistant. It is difficult to disperse during mixing, the heat generation is high, the Mooney viscosity of the rubber material is high, and it is easy to scorch. , different formulas and different uses require different specific surface areas, and the impact of specific surface area on the physical and mechanical properties of vulcanized rubber is not consistent.
2. Oil absorption value
The oil absorption value reflects the degree of structure, and the oil absorption value is large , the structure is small, the tensile strength of vulcanized rubber is generally larger, the tensile strength and hardness are larger, especially the wear resistance is smaller, but the elongation is lower.
3. Loss on ignition at 900℃
shows that when there are too many hydroxyl groups on the surface, it is easy to cause the rubber composite material to Structuring, making the material brittle. It affects the processing performance, and the vulcanized rubber is easy to fall off, and the surface hydroxyl group has a strong adsorption effect on the vulcanization accelerator, prolonging the vulcanization time.
4. Heating loss at 105℃
Reflects the amount of free water in the particle gaps. If it is too little, the rubber will When the degree of structure is high, it becomes difficult to mix rubber. If the heating loss is zero, the silica is useless. Generally, it is more appropriate to control it at about 6%.
5. PH value
Generally around 7, the PH value increases (the acidity decreases) , the rubber vulcanization speed is accelerated.
6. Soluble salt
Fewer is better, but less means higher cost.
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