Preparation method of flame-retardant canvas

Abstract

The invention relates to a preparation method of flame-retardant canvas. According to the preparation method, canvas is from self-twisted fibers and then is subjected to secondary impregnation treatment to prepare the flame-retardant canvas; the preparation process of the self-twisted fiber is that after a high-viscosity CDP melt and a low-viscosity CDP melt are distributed according to a spinningprocess, and an industrial yarn is obtained through extrusion from spinneret holes in the same spinneret plate, relaxation heat treatment is carried out to obtain the self-twisted fiber; the spinningprocess comprises three times of stretching and two times of shaping; the intrinsic viscosity of the high/low-viscosity CDP melts is relatively high; each spinneret hole is a spinneret hole with theshape 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 refersto controlling the high-viscosity CDP melt to flow through the horizontal line while controlling the low-viscosity CDP melt to flow through the vertical line I and the vertical line II. The mechanical property and the contact area with rubber of the low-viscosity CDP/high-viscosity CDP double-component composite fiber are improved effectively, and the flame-retardant canvas with relatively high bonding strength between the canvas and the rubber is prepared.

Description

technical field [0001] The invention belongs to the field of fiber technology and relates to a preparation method of flame-retardant canvas. Background technique [0002] Canvas is a thicker cotton or linen fabric. So named because it was originally used for sails. Generally, plain weave is used, a small amount of twill weave is used, and multi-strand yarns are used for warp and weft yarns. Canvas is usually divided into two categories: coarse canvas and fine canvas. In addition, there are rubber canvases, shielding canvases for fire protection and radiation protection, and canvases for paper machines. If the existing canvas encounters a fire, the flame retardant effect is poor. The existing domestic preparation methods of flame-retardant canvas can be roughly divided into the following categories: [0003] (1) In the original canvas process, a flame retardant is added to the dipping solution to improve the flame retardant performance of the canvas. Although this type o...

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Problems solved by technology

[0005] (3) Aramid fiber is used in the canvas structure, and the flame retardancy of aramid fiber is used to improve the overall flame retardancy of the canvas. This kind of flame-retardant canvas has problems such as high cost and poor bending resistance.

[0006] The above-mentioned preparation methods all have the problems of limited flame-retardant effect and general adhesive performance between canvas and rubber. Patent CN 107447533A discloses a preparation method of polyester flame-retardant canvas to solve the above problems. However, the adhesion between canvas and rubber Adhesive performance still needs to be further improved

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