Preparation method of water-repellent canvas

Abstract

The invention relates to a preparation method of water-repellent canvas. After a high-viscosity CDP melt and a low-viscosity CDP melt are distributed according to a spinning process, and an industrialyarn is obtained through extrusion from spinneret holes in the same spinneret plate, relaxation heat treatment is carried out to obtain a self-twisted fiber; then the self-twisted fiber is woven intocloth, and next, the cloth is padded with a waterproof finishing agent and coated with a waterproof coating to prepare the water-repellent canvas. The spinning process comprises two times of stretching and three times of shaping; the intrinsic viscosity of the high-viscosity CDP melt is 1.10-1.23dL / g, and the intrinsic viscosity of the low-viscosity CDP melt is 0.70-0.75dL / g; the cross section ofthe spinneret hole is in the shape as shown in the speciation, and the shape is composed of a horizontal line and a vertical line I and a vertical line II connected vertically with the horizontal line; and the distribution refers to controlling the low-viscosity CDP melt to flow through the vertical lines I and II, and simultaneously controlling the high-viscosity CDP melt to flow through the horizontal line. According to the preparation method, the mechanical properties and the contact area with the waterproof finishing agent of the double-component composite fiber are improved, and the high-peel-strength water-repellent canvas is prepared.

Description

technical field [0001] The invention belongs to the technical field of fibers, and relates to a preparation method of a water-repellent canvas. Background technique [0002] Since its inception, polyethylene terephthalate (PET) fiber has developed rapidly because of its excellent properties, and its output has become the top synthetic fiber in the world. Because polyester fiber has a series of excellent properties such as high breaking strength, high elastic modulus, moderate resilience, excellent heat setting performance, good heat and light resistance, and good acid and alkali resistance and corrosion resistance, and the fabric prepared from it has It has the advantages of anti-wrinkle and good stiffness, and is widely used in many fields. In my country, polyester with a polyethylene terephthalate content of more than 85% is called polyester. Due to its excellent properties, polyester filament has become one of the fastest-growing and highest-yielding synthetic fibers, a...

AI Technical Summary

Problems solved by technology

However, the adhesion between the waterproof coating and the polyester is poor, so that the water-repellent canvas cannot meet the actual use requirements. If the contact area between the polyester and the waterproof finishing agent can be increased, this problem will be effectively solved

[0005] In addition, the dyeing performance of canvas base fabrics made of polyester is poor. With the industrial production of CDP polymers and fibers and the expansion of application scope, a new type of high-viscosity CDP / low-viscosity CDP dual Component composite fiber has excellent dyeing performance. If it is used instead of polyester, it will effectively solve the problem of poor dyeing performance of canvas base fabric. However, the current high-viscosity CDP / low-viscosity CDP two-component composite fiber has poor mechanical properties , unable to meet the use requirements of canvas base cloth

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