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Influence of adhesive properties of high pressure rubber pipes
Upload Time:
2022-09-15
The use pressure of high-pressure rubber pipes is increasing, which puts forward higher requirements on the physical properties, bonding properties, compression deformation and scorching properties of high-pressure rubber pipes. The physical properties of the inner rubber of the high-pressure rubber tube play an important role in the overall quality of the rubber tube. In addition to good physical properties, high-pressure rubber pipe rubber materials must also have good process performance and vulcanization performance during the production process of high-pressure rubber pipes. Process performance mainly refers to self-adhesion, tube blank, fluidity, fluidity and extrudability. The vulcanization performance includes vulcanization speed, scorch resistance, vulcanization flatness, vulcanization reversion and so on. Therefore, the selection of vulcanizing agents and accelerators is very important for the design of high-pressure rubber tube rubber material formulations.
In the two vulcanization systems, the effect of accelerator varieties on the scorch properties of high-pressure hose compounds at 140 °C, and the extrusion temperature was 140 °C.
Under the high temperature condition of 140 ℃, in two different vulcanization systems, the scorch performance of the colloid containing secondary sulfonamide accelerator is better than that of colloid containing thiazole type accelerator, the colloid containing accelerator DZ is outstanding, and the colloid containing accelerator CZ, The cautery properties of NS and NOBS colloids are similar. The accelerator group of the secondary sulfonamide accelerator is the same as that of the thiazole accelerator, but it also has an anti-focusing group and an active group, which overcomes the shortcoming of the scorching time of the sulfur accelerator. Wang Bing and others [5] pointed out that the accelerator DZ molecule contains two rings and one benzene ring, which has a large retarding effect. Followed by accelerators DM, CZ, NS and M, there is not much difference between accelerators DM and CZ, accelerator NS is slightly smaller, and accelerator M is quite different, which determines that accelerator DZ has great processing safety and Anti-focus effect. Therefore, the selection of secondary sulfonamide accelerators can prevent the high pressure hose colloid from burning during extrusion and ensure the safety during extrusion.
In these two vulcanization systems, the effect of accelerator types on the bonding properties of high-pressure rubber pipes. The diameter of copper-plated steel wire is 0.295mm and the strength is 2750mpa. In these two vulcanization systems, NBR sulfides containing sulfenamide accelerators (except NOBS) have good adhesion properties to copper-coated steel wires. In the compound vulcanization system, the DZ rubber material containing the accelerator has a larger pumping force and a good bonding effect; the NBR rubber contains sulfide and copper-plated steel wire, and the pumping force of the sulfide and the sulfide accelerator is higher than that of the sulfide accelerator. Small.
The adhesion between the rubber and the copper-coated steel wire mainly depends on the adsorption capacity of the sulfide in the adsorption center of the metal surface. The secondary sulfonamide accelerator rubber material has good adhesion, mainly because the critical temperature of the sulfide of the secondary sulfonamide accelerator is higher than 140 ℃, and it has a long induction period and a wide vulcanization plane range, which can ensure the rubber There is enough time before vulcanization to form sufficient adsorption active centers, and it can quickly reach the positive vulcanization point after vulcanization. The NBR rubber material containing secondary sulfonamide accelerator DZ has longer induction period and longer scorch time. The rubber material has sufficient flow time before the sulfide to ensure sufficient time for the formation of the adsorption active center and the adsorption of the sulfide, so as to ensure the sufficient reaction between the sulfide and the copper plating layer, which is beneficial to improve the bonding strength. Therefore, in the design of the high-pressure rubber tube rubber material, in order to ensure the adhesion between the rubber material and the copper-plated steel wire, it is more appropriate to select a secondary sulfonamide accelerator, of which D2 has excellent adhesion.
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