In the process of rubber processing, stearic acid is added as an auxiliary material, and the proportion added is very small, usually 0.5-3 parts of stearic acid per hundred parts of rubber, but it is indispensable. As vegetable oil-based fatty acids, in the process of rubber (tire) processing, after adding in a certain proportion, it can be summed up in the following four aspects:
1. Softening and plasticizing;
2. As an external lubricant;
3. It is beneficial to the full diffusion of carbon black, silica and zinc oxide;
4. Reacting with zinc oxide or alkaline accelerator can promote its activity, and it is also the main vulcanization accelerator, which can play the role of the second accelerator. Accelerates hardening.
It has a greater impact on the rubber compound, and its effect is opposite to that of carbon black. It will significantly reduce the viscosity of the rubber compound, improve the process performance, and significantly improve the plasticity of the rubber compound.
The length of the fatty acid carbon chain has no effect on its efficacy, and the softening effect of lauric acid and oleic acid is also very good. However, the high unsaturation of oleic acid will interfere with the rubber processing process, and oleic acid also has a tendency to increase rubber aging. The acid value of lauric acid is very high, which will greatly delay the vulcanization of rubber. The factory needs to change the formula and adjust the process parameters. Due to formulation constraints and consideration of certain parameters, companies basically only use stearic acid as a product.
In practical application, various application manufacturers and research institutions do not have a unified view on which specification of stearic acid to use: Regarding the content of C18: some think that a higher content should be used; some think that ordinary grades can be used. Regarding the iodine value: the lower the iodine value, the better. Regarding the acid value: the acid value of stearic acid should be controlled within a corresponding reasonable range, and the smaller the range value, the better. It is appropriate to control the acid value content at 205-211.
Although the research on the effect of stearic acid by domestic enterprises is not enough, the quality requirements of stearic acid have become higher and higher, especially with the increasing output of radial tires, in order to adapt to various road conditions, the quality requirements of tires are becoming more and more important. The stricter, the quality requirements for various raw materials (including stearic acid) are also increasing. The same is true for normal bias tires.
With the continuous improvement of production technology of various enterprises, the quality management system of enterprises is becoming more and more standardized, and the quality requirements for stearic acid are becoming more and more refined. In this case, the standard, stable, high-volume, high-quality products should be used instead of the other way around.
Under the condition that the various functions of stearic acid are not fully understood, using high-quality stearic acid to produce high-quality and high-grade tires, and using better stearic acid for ordinary tires is not only a guarantee for the safety of users, but also an enterprise On the premise of ensuring quality, the production and sales of enterprises will also be more secure.
Disclaimer: The picture materials and articles on this platform are from the Internet, so the copyright belongs to the original author. If your copyright and interests are infringed, please contact us, we will apologize and delete it quickly. Article source: Rubber Technology Network
Latest news
- The Combination and Foaming Process of
- Famous tire enterprise with multiple d
- Ministry of Commerce Initiate a final
- The Effect of Carbon Black on the Cutt
- Stop work orders encounter rising pric
- Lanzhou Petrochemical's carboxylated n
Contact us
- ADD: Room 4210, CEC Business Hall, No. 121-4, Nanjing South Street, Heping District, Shenyang
- TEL: 13644907299
- FAX: 024-25361668
- E-mail: boss@long-green.cn
> Company new