Solvent-free fiber dipping composition and preparation method thereof

Abstract

The invention discloses a solvent-free fiber dipping composition and a preparation method thereof. The solvent-free fiber dipping composition is prepared from the following components in parts by weight: 5-50 parts of liquid rubber, 5-50 parts of isocyanate, 5-20 parts of plasticizer, 5-50 parts of polyurethane resin, and 5-10 parts of tackifying resin. The above components are free of volatile solvent and are pollution-free, the dip pickup can be uniformly controlled and can reach 30%, the heat treatment temperature is 80-200 DEG C, low energy consumption is achieved, and the treated fiber surface is smooth and is easy to weave and twine; and besides, the treated fiber has excellent physical and mechanical properties, the adhesion property of the fiber with a base material such as rubber is superior to that of traditional dipping system, and the solvent-free fiber dipping composition is particularly suitable for being used as a reinforcing material for rubber products such as rubber hose and the like.

Description

technical field [0001] The invention relates to a solvent-free fiber impregnation composition and a preparation method thereof, which is especially suitable as a reinforcing material for rubber products such as rubber hoses, and belongs to the field of composite materials. Background technique [0002] Many rubber industrial products, such as tires, rubber hoses and conveyor belts, require fabric skeleton materials to obtain high strength and dimensional stability. The lack of active groups for bonding between the rubber molecular chains results in poor adhesion between the fiber material and rubber. In order to obtain good adhesion between the skeleton fiber material and rubber, it is necessary to impregnate the surface of the fiber. [0003] At present, the surface impregnation treatment of fibers mainly uses resorcinol-formaldehyde latex (RFL), epoxy resin / blocked isocyanate for one-bath, two-bath or three-bath impregnation. The impregnated fiber material and rubber How...

AI Technical Summary

Problems solved by technology

[0002]Many rubber industrial products, such as tires, rubber hoses and conveyor belts, etc., require fabric skeleton materials for high strength and dimensional stability, and the bonding of skeleton materials and rubber Performance is the key to obtain the excellent performance of the product, but there is a lack of active groups for bonding between the molecular chains of the fiber material and the rubber molecular chains, resulting in poor adhesion between the fiber material and rubber. In order to obtain a bond between the fiber material and rubber Good adhesion between fibers requires surface impregnation

[0003]At present, the surface impregnation treatment of fibers mainly uses resorcinol-formaldehyde latex (RFL), epoxy resin / blocked isocyanate for one-bath method, two-bath Bath method or three-bath method impregnation can form a good adhesion between the impregnated fiber material and rubber, but there are the following problems: First, the surface of the fiber after impregnation in the traditional system is not smooth, and the weaving, winding, etc. During the processing process, there is a large friction force with the equipment, which is easy to cause thread breakage and glue loss. Regular cleaning of weaving, winding and other equipment is required, which affects production efficiency and product quality

Secondly, one type of these impregnating systems is water-soluble, that is, water is used as a solvent and contains ammonia, phenol, formaldehyde, etc., and the other type is toluene as a solvent containing phenol, formaldehyde, etc. During fiber impregnation and heat treatment, the solvent The volatilization of volatile substances such as formaldehyde will cause great harm to the environment and operators; third, the fiber bonding layer impregnated with the RFL system needs to be treated at 200-240°C at high temperature, which not only consumes a lot of energy, but also complicates the process , for a long time, if the moisture is not completely evaporated, the residual moisture will seriously affect its adhesive performance

[0004] Therefore, the existing process has many problems such as low production efficiency, unstable product quality, hazards to the environment and operators, complex process, high energy consumption, and long time question