Application of Plasticizer A in Radial Tire Glue
It is a direction of current formulation design and adjustment to improve the dispersion degree of various compounding agents in the rubber compound and improve the processing property of the rubber compound to reduce energy consumption and improve mixing efficiency. Since the radial tire rubber compound has high dispersibility requirements for various compounding agents, and the rubber compounding energy consumption is large, domestic and foreign tire manufacturers have widely used various rubber processing aids in radial tire rubber compounds. Plasticizer a is a fatty oil plasticizer composed of a mixture of zinc soaps of various unsaturated and saturated higher fatty acids such as stearic acid, palmitic acid, oleic acid, linoleic acid and citric acid. Improve the processing performance of the rubber compound, improve the dispersibility of the compounding agent in the rubber compound, and improve the fluidity of the rubber compound. This topic explores the application effect of plasticizer a in radial tire tread rubber.
1 experiment
1.1 The main raw material plasticizer a, the appearance of beige flakes, the chemical analysis results are shown in Table 1, Wuhan City River Chemical Factory products.
1.2 Formulation test formula: raw rubber 100; vulcanizing agent 1.0; accelerator 1.5; zinc oxide 4.0; stearic acid 2.0; anti-aging agent 2.5; carbon black 55.0; plasticizer a 1.5; other 0.33, total 167.83. The production formula was the same as the test formulation except that there was no plasticizer a.
1.3 Instruments and equipment XK 160 type open mill, Guangdong Zhanjiang Machinery Factory; R 100S type vulcanizer and T 10 type tensile test machine, Monsanto Company, USA; MH 74 type wear test machine, Zhejiang Rubber Machinery Factory; ZND 1 Type Mooney Viscometer, Shanghai Rubber Machinery Factory.
1.4 Performance test Tensile strength, tear strength, abrasion performance, Shore A hardness and Mooney viscosity are respectively in accordance with GB/T528-92, GB/T529-91, GB1689-89, GB/T531-92 and GB/T1232 ―92 standard test.
2 Results and discussion
2.1 Small fit test The results of the small fit test of plasticizer a applied in radial tire tread rubber are shown in Table 2. It can be seen from Table 2 that compared with the production formula, the maximum torque and minimum torque of the test compound are slightly reduced in terms of the properties of the unvulcanized rubber, and the scorch time and vulcanization time are slightly shortened. It is the plasticizer a which has higher unsaturated bond activity and complex chemical reaction with various components in the rubber compound, which accelerates the cross-linking of rubber molecules during vulcanization, which accelerates the vulcanization reaction rate; The tensile strength, elongation at break, 300% modulus, tensile strength and tear strength of the test formula are slightly improved, the rebound value is slightly reduced, wear resistance and fatigue resistance. There is a large improvement, which is because the addition of plasticizer a improves the dispersibility of various compounding agents and makes the distribution of rubber macromolecular crosslinks more uniform.
2.2 Large fit test
2.2.1 Mixing process In the large compounding test, the test formula rubber and the production formula rubber are all mixed in three stages by F270 internal mixer. Since the Mooney viscosity value of the test compound is lower than that of the production formula, the mixing process parameters of the mixing of the test compound are adjusted (see Table 3), and the power consumption of the internal mixer in each mixing stage is adjusted. The situation is shown in Figure 1. It can be seen from Table 3 that compared with the production formula compound, the temperature of the second-stage mixing and final melting of the test compound is reduced by 5 °C, and the mixing time, the second-stage mixing and the finalizing time are shortened respectively. 18%, 23% and 10%. It can be seen from Fig. 1 that compared with the production formula, the mixing, the second-stage mixing and the final power consumption of the test compound have different degrees of reduction. The shortening of mixing time and the reduction of power consumption indicate that the addition of plasticizer a increases the softness and fluidity of the rubber compound, makes the dispersion of various compounding agents easier and more uniform, and reduces the shearing required for mixing. The cutting force reduces the energy consumption of the rubber compounding and improves the mixing efficiency.
2.2.2 Physical properties The physical properties of the test compound are shown in Table 4. It can be seen from Table 4 that the wear resistance and fatigue resistance of the test formula compound are improved compared with the production formula compound, and the remaining properties are not changed much. This is basically consistent with the results of the small fit test.
2.2.3 Extrusion process performance Under the conditions of preheating, glue supply and operation of all parts of the extruder, the tread extrusion process parameters of the test formula and the production formula are shown in Table 5. As can be seen from Table 5, the tread extrusion temperature of the test formulation compound was significantly lower than that of the production formula. At the same time, it can be observed that the fluidity of the test compound is better, the dimensional and quality stability of the extruded tread is higher, and the pores in the middle of the extruded tread are reduced, so that the surface of the extruded tread is smoother and more Dense, the rate of return is reduced.
3 Conclusions Adding 1.5 parts of plasticizer a to the radial tire tread rubber has the following effects: (1) improving the wear resistance and fatigue resistance of the tread rubber; (2) reducing the energy consumption of the tread rubber mixing and Improve mixing efficiency, and the average mixing time is reduced by about 17%. (3) Improve the fluidity of the tread rubber, reduce the tread extrusion temperature, and improve the quality of the extruded tread.
Satin Table Linen,Table Linen Round,Round Square Tablecloth,Table Cover Elastic Tablecloth
Shaoxing Gold Sun Textile Co., Ltd. , https://www.sx-goldsun.com