Polyether type polyurethane rubber compound with high hardness and high fluidity

Abstract

The invention discloses a polyether type polyurethane rubber compound with high hardness and high fluidity. The rubber compound comprises the following components in parts by mass: 100 parts of raw polyurethane rubber UR101, 30-50 parts of precipitated white carbon black, 0.5-1 part of stearic acid, 1-3 parts of a silane coupling agent, 10-18 parts of anti-scorching TMPTMA, 1-2 parts of a crosslinking aid ZDMA, 2-5 parts of an anti-scorching peroxide vulcanizing agent, and 0-4 parts of a processing aid. According to the invention, the polyether type raw polyurethane rubber UR101 is used as a main body material, and a plurality of compounding agents with good compatibility are selected, so mooney viscosity is controlled to be 50 or below while the rubber compound meets the requirement for high-hardness, scorching time can be prolonged to meet the requirements of a processing technology, and finally, the rubber compound meets the performance requirements for high hardness and high fluidity.

Description

technical field [0001] The invention relates to polyurethane compound rubber technology, in particular to a polyether type polyurethane compound rubber with high hardness and high fluidity. Background technique [0002] As we all know, polyurethane rubber has the best wear resistance among all rubbers, and is known as "wear-resistant rubber". The polyurethane compound made of polyether polyurethane rubber as the main body has high elasticity and mechanical strength, excellent oil resistance, water resistance and ozone aging resistance in addition to excellent wear resistance. Heat resistance, low temperature resistance and processing stability, and a wide range of hardness, can be made into materials from 25A to 95A through different compound formulations. Therefore, polyurethane compound rubber is widely used in equipment, electrical appliances, automobiles, textiles, shoemaking and other fields, and is suitable for making various high-performance seals, O-rings, rubber ho...

AI Technical Summary

Problems solved by technology

High-hardness mixed rubber is generally achieved by adding a large amount of reinforcing agent, but too much reinforcing agent will cause some process problems: first, it will make the dispersion uniformity of the mixed rubber worse and cause fluctuations in physical properties; Secondly, the Mooney viscosity of the mixed rubber will increase, and the fluidity of the rubber material will deteriorate; thirdly, the internal heat of the mixed rubber will be greater, the scorch time will be shortened, and the rubber material will be easily scorched and vulcanized during mixing. poor mobility

Due to these process problems, the use of high hardness compound rubber is limited to a certain extent

For example, some large-sized and complex-shaped molded products, due to poor fluidity of the rubber material and short scorch time, the rubber material cannot fill the mold cavity during molding, and the rubber material is poorly vented, resulting in product quality defects (lack of glue, thick burr Good edge tearing, nest air, size deviation, etc.)

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