Preparation method for novel TPU (Thermoplastic Polyurethane) aramid fiber coated fabric

Abstract

The invention relates to a preparation method for novel TPU (Thermoplastic Polyurethane) aramid fiber coated fabric. The preparation method comprises the steps of firstly, conducting heat treatment, sizing and surface treatment on high-strength aramid fiber fabric; secondly, adding a polyurethane elastomer into a hopper, sealing, drying and dehumidifying; thirdly, adjusting the direction of a handpiece; fourthly, preheating the handpiece, opening a traction machine every 20 minutes to pull the aramid fiber fabric out of the handpiece for 190-210mm; fifthly, drying the aramid fiber fabric subjected to the surface treatment; and sixthly, when the temperature of the handpiece reaches to be a certain value, starting an extrusion machine and conducting the traction so as to enable the aramid fiber fabric to pass through a mouth of the handpiece and enable polyurethane granules to enter a screw extruder, moving the granules towards the direction of the handpiece, heating the granules to achieve the temperature being 200 DEG C-210 DEG C at the mouth of the handpiece, driving the granules to enter the extrusion handpiece in a melted viscous flow state, coating the granules on the upper surface and the lower surface of the aramid fiber fabric, cooling, drawing and curling the polyurethane aramid fiber fabric to form the high-strength ultra oil-resistance TPU aramid fiber coated fabric.

Description

1. Technical field [0001] The invention relates to a preparation method of a novel TPU aramid fiber coated fabric, in particular to a preparation method of a polyurethane (TPU) coated aramid fiber fabric with high strength, excellent oil resistance and low temperature. 2. Background technology [0002] Domestic coated fabrics include rubber and plastic coated fabrics. Both rubber and plastic coated fabrics are coated on aramid fabrics by calendering or casting, and then cooled to form TPU aramid coating. Fabric, coated fabric can be made into products after cutting, parking, molding and vulcanization. [0003] The existing oil-resistant coated fabrics are generally nitrile rubber and its composites. The nitrile rubber coated fabric coating nitrile rubber and its composite coating are easy to perform two-way material exchange with the stored fuel, that is, the fuel molecules pass through the nitrile The inner rubber layer of nitrile rubber and its composite rubber coating se...

AI Technical Summary

Problems solved by technology

[0003] The existing oil-resistant coated fabrics are generally nitrile rubber and its composites. The nitrile rubber coated fabric coating nitrile rubber and its composite coating are easy to perform two-way material exchange with the stored fuel, that is, the fuel molecules pass through the nitrile The inner rubber layer of nitrile rubber and its composite rubber coating seeps out to cause oil leakage in the container, and at the same time, small molecules such as additives and additives in the inner rubber layer are leached by the fuel and sucked out of the low molecules of the inner rubber layer into the fuel. Therefore, there are at least the following disadvantages in the products made of existing nitrile rubber coated fabrics: oil resistance is not good, and fuel oil is easily polluted, that is, the low molecular weight of the rubber material is separated from the inner rubber layer and enters the stored In the fuel, the fuel is easy to seep through the inner rubber layer, causing fuel pollution and affecting the performance of the fuel; the low-temperature performance of nitrile rubber is poor, it is easy to become brittle at low temperature, and the fold is damaged; on the other hand, the oil-resistant coated fabric The skeleton materials are generally nylon and polyester fibers, which have low strength and cannot meet the requirements of high strength.

[0004] The skeleton materials of the existing rubber-coated fabrics and plastic-coated fabrics are general nylon and polyester fibers. The skeleton materials have low strength and poor tear performance, which cannot meet the requirements of equipment for high-strength and high-tear performance tapes under special circumstances. , and generally rubber and plastic-coated fabrics have poor low-temperature performance; in terms of oil resistance, nitrile rubber-coated fabrics have good oil resistance, and plastic-coated fabrics have excellent oil resistance