Indirect method zinc oxide for rubber shoe materials

含量：

99.8

外观：

白色

原料：

有机物

Zinc oxide is one of the important additives in the rubber industry. During the vulcanization process of the product, the test results of nano-zinc oxide with different specific surface areas in the bias tire tread formula are reported. The table shows the effect of the specific surface area of nano-zinc oxide on the performance of the vulcanized rubber. Impact
It can be seen from the table that there is a strong correlation between the physical and mechanical properties of the rubber compound and the specific surface area of nano-zinc oxide. In particular, properties such as % tensile stress, abrasion, compression permanent deformation, compression fatigue temperature rise and other properties have been significantly improved compared with indirect zinc oxide. This is consistent with reports in the literature. The author has conducted similar experiments on bias tire treads, and the results are consistent with the results in the table. It shows that as the specific surface area of zinc oxide increases, the affinity for electrons increases, and the ability of nano zinc oxide particles to adsorb accelerators, especially sulfenamide accelerators, increases. Gradually strengthen the zinc salt complex formed in the rubber material
. ． The modulus stress increases significantly and the wear resistance improves
As the cross-link density of the vulcanized rubber increases, the structural form of the cross-link bonds changes to monosulfide bonds and disulfide bonds. The data reports that the bond energies of different cross-link bonds are as shown in the table: Table 1 shows the energy of various types of cross-link bonds
As the specific surface area of nano-zinc oxide increases, the cross-link polysulfide bonds reduce the monosulfide and disulfide bonds. The increase in cross-linking bonds means that the energy consumed to achieve a certain deformation of the vulcanized rubber is large; on the contrary, the deformation of the vulcanized rubber is small when the same energy is consumed. Therefore, it is manifested as an increase in the modulus (modulus) of the vulcanized rubber and an increase in wear resistance. This is obviously different from improving the performance of rubber compounds through carbon black reinforcement. The latter is mainly manifested in the fact that the directionality of the three-dimensional branched chain structure of carbon black aggregates hinders the orientation movement of the vulcanized rubber molecular network when the sample is stretched.
． ． Compression permanent deformation and compression fatigue temperature rise are reduced
Generally speaking, the cross-linking form of the cross-linking bond has a great influence on the high temperature test and the heat generation during the test. The compression permanent deformation and compression fatigue heat generation test illustrates cross-linking. The fewer sulfur atoms in the bond, the better the compression permanent deformation and compression fatigue heat generation (constant load compression) of the vulcanized rubber. Under a certain load, the deformation is small and the fatigue heat generation is small. At the same time, the cross-linked bond energy is higher and the energy required for degradation is higher, which inhibits the increase of compression permanent deformation.
In addition, as the specific surface area of nano-zinc oxide increases, the form of cross-linking bonds determines the increase in the retention rate of the hot air aging performance of the vulcanized rubber, thereby improving the thermal stability of the vulcanized rubber.
It mainly plays the role of thermal conduction and promotion of vulcanization [] After the vulcanization is completed, zinc oxide can also strengthen rubber products to improve physical and mechanical properties. The physical and chemical effects of zinc oxide in rubber are closely related to its dispersion effect in the rubber compound. Ordinary zinc oxide and rubber are difficult to mix in the rubber when mixed because they have the same charge
. Effect of nano-zinc oxide reduction on vulcanizate properties
The literature reports that the use of fine-particle zinc oxide is suitable for most situations. About % zinc oxide can obtain sufficient vulcanization speed and cross-linking density. This shows that as the zinc oxide particles decrease, the specific surface area increases and the specific surface area of the nano-zinc oxide added is guaranteed to be uniformly dispersed in the rubber. A specific surface area close to % of the indirect method zinc oxide can ensure the requirements for vulcanization activity. Comparison between different dosages of nano-zinc oxide expressed as / specific surface area and indirect zinc oxide:
Effect of dosage of nano-zinc oxide on the performance of vulcanized rubber
Formula: parts r parts. Carbon black content. Stearic acid promotes Jing. part of sulfur. share. Fang Lao Ci. share. Softener. share. Stonefly. portion