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Over the years, compression molding has been the main molding method for the production of rubber products, but with the development of society and technological progress, the quality of rubber products, production efficiency, energy consumption and raw material consumption and other aspects have higher requirements. Compared with the molding compound, injection molding compound density, hardness, strong elongation properties and elongation of the pull-off
The hardness, tensile and elongation properties and elongation at break are improved, and the permanent shape at break is reduced, which is conducive to the improvement of the performance of rubber products. Lv Baiyuan 'studied the properties of rubber products prepared by molding and injection molding methods, and found that. The hardness of injection molded rubber is about 1% higher than that of compression molding; the tensile strength of injection molded tread and oilfield blowout preventer core rubber is 1.3% and 4.6% higher than that of compression molded rubber; the 100% and 300% constant tensile stress of oilfield blowout preventer core injection molded rubber is 13% and 20% higher than that of molded rubber; the tensile elongation of all-steel radial tire tread injection molded rubber is 20% higher than that of compression molded rubber; and the elongation of all-steel radial tire tread injection molded rubber is 20% higher than that of compression molded rubber. Injection molding of all-steel radial tire tread elongation increased by 20% and tear strength increased by 27% compared with the molded rubber; injection molding of oilfield blowout preventer core tensile permanent deformation decreased by 12% compared with the molded rubber. It is analyzed that the high fluidity of the rubber during the injection molding process and the high injection pressure increase the degree of crosslinking of the molecular network, which improves the tensile strength and constant tensile stress of the rubber, and at the same time, the distance between the molecular network decreases, which increases the hardness of the rubber.
Therefore, the injection molding technique is beneficial to the improvement of elasticity, abrasion resistance, tear resistance and flexural resistance of the products.
The hardness, tensile and elongation properties and elongation at break are improved, and the permanent shape at break is reduced, which is conducive to the improvement of the performance of rubber products. Lv Baiyuan 'studied the properties of rubber products prepared by molding and injection molding methods, and found that. The hardness of injection molded rubber is about 1% higher than that of compression molding; the tensile strength of injection molded tread and oilfield blowout preventer core rubber is 1.3% and 4.6% higher than that of compression molded rubber; the 100% and 300% constant tensile stress of oilfield blowout preventer core injection molded rubber is 13% and 20% higher than that of molded rubber; the tensile elongation of all-steel radial tire tread injection molded rubber is 20% higher than that of compression molded rubber; and the elongation of all-steel radial tire tread injection molded rubber is 20% higher than that of compression molded rubber. Injection molding of all-steel radial tire tread elongation increased by 20% and tear strength increased by 27% compared with the molded rubber; injection molding of oilfield blowout preventer core tensile permanent deformation decreased by 12% compared with the molded rubber. It is analyzed that the high fluidity of the rubber during the injection molding process and the high injection pressure increase the degree of crosslinking of the molecular network, which improves the tensile strength and constant tensile stress of the rubber, and at the same time, the distance between the molecular network decreases, which increases the hardness of the rubber.
Therefore, the injection molding technique is beneficial to the improvement of elasticity, abrasion resistance, tear resistance and flexural resistance of the products.
According to the literature report, using injection molding technology, under 4.5 ~ 7MPa pressure curing conditions, the tread wear resistance can be increased by 20% ~ 25%; according to the domestic research, the curing pressure can be increased by 20% ~ 25%; according to the domestic research, the curing pressure can be increased by 20% ~ 25%. According to the domestic research, when the curing pressure is increased from 0.5MPa to 7.0MPa, the Akron abrasion is reduced from 0.5cm/km to 0.282em/km, and the abrasion resistance is improved by 43%; the abrasion resistance of the tread is improved by 43%; the abrasion resistance of the tread is improved by 43%. The data of molding and injection molding conducted by Xiaohang also showed that the elongation of all-steel tread was increased by 20% and the tear strength was increased by 9.8%; in the oilfield blowout preventer, the elongation was increased by 20% and the tear strength was increased by 9.8%. In the oilfield blowout preventer, the tear strength increased by 3.6%, 100% fixed elongation strength increased by 10.9%, 300% fixed elongation strength increased by 21.7%, elongation rate increased by 3.4%, tear energy increased by 2.1%, permanent deformation decreased by 10.0%, and the tear strength increased by 3.6%. The mechanical and physical properties of the specimens were generally improved with the increase of 3.4% in elongation, 2.1% in tearing energy and 10.8% in permanent deformation.
