In the production process of nitrile rubber products, choosing a suitable molding process can be processed into rubber products that meet the requirements of shape and size. Problems such as bubbles during the molding of nitrile rubber products will not only affect the appearance of the product, but also affect the performance and life of the rubber product in severe cases. In actual production, what problems will occur when nitrile rubber products are molded, and how to solve these problems?
1. High adhesion rubber
To solve the problem of high adhesion rubber and rubber in the molding process of nitrile rubber, there are three basic solutions: low viscosity, Prevent migration and "blooming" and thickening. From the formulation point of view, nitrile rubber with low viscosity and high acrylonitrile content can be used, or the amount of low-reinforcing filler can be increased appropriately, or liquid nitrile and non-migrating plasticizer can be used in an appropriate amount. It is recommended that it is not easy to spray The vulcanization and anti-aging. From the operating process point of view, solvents can be used to wipe the surface to reduce the adhesion the rubbers.
2. Bubbles in extruded products
To solve the problem of bubbles in extruded nitrile rubber products, rubber product manufacturers can use high Mooney viscosity nitrile rubber and choose fast vulcanization , Use appropriate amount of dehydrating agent and hygroscopic agent, can not use low boiling point plasticizer. The basic solution to avoid nitrile squeezing out bubbles is to remove volatiles. From the point of view of process operation, an extruder with vent holes can be used to appropriately increase the temperature of the extruder without scorching, increase the mixing temperature during mixing, remove low volatiles, and effectively avoid the generation of bubbles.
3. Shape error of the extruded product
When the shape error of the extruded nitrile rubber product appears, it is recommended to use high Mooney nitrile rubber, use ointment, and high structure furnace Black increases the viscosity of the compound, choose a fast vulcanization, or use a high degree of polymerization PVC when wet, increase the viscosity of the nitrile rubber, improve the vulcanization process, and avoid errors in the shape of the extruded product. From the perspective of process operation, choosing low-temperature extrusion, appropriately reducing the extrusion speed and vulcanization temperature, and put into the mold core can reduce the probability of shape errors in the extruded products.
4. Radiation traces appear
When nitrile rubber products appear radial traces, when forming radial traces, from the formulation point of view, you can add plasticizers and softeners. Use the amount to reduce the viscosity of the rubber compound, or use a rubber with low Mooney viscosity, and use an appropriate amount of tackifier to improve the adhesion of the rubber compound and avoid the occurrence of radiation cobweb traces. From the perspective of process operation, reducing the mold composition when designing the mold, increasing the extrusion temperature by 10-20°C during extrusion, or reducing the extrusion speed can also effectively avoid the radial traces of the nitrile rubber products.
In the molding process of nitrile rubber products, 2YLYY802it is necessary to improve the stiffness of the molded product. It is recommended to use high-temperature polymerized high Mooney nitrile rubber, or use high-reinforcement fillers, and use appropriate amount of tensile crystallinity For rubber, add an appropriate amount of rubber hardener, or add an appropriate amount of PVC; do not over-mix during mixing. Two-stage mixing is recommended. Using Hongyun Nitrile Reclaimed Rubber to provide mature formulas of nitrile rubber products free of charge, and there are many specific details that need to be paid attention to to improve the molding process of nitrile rubber products. The editor has the opportunity to discuss related issues with you.
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