A kind of high-strength viscose fiber non-woven fabric and preparation method thereof

Abstract

The invention provides a high-strength viscose fiber nonwoven fabric and a preparation method thereof. First, an isocyanate-terminated polyurethane prepolymer is prepared, and the isocyanate-terminated polyurethane prepolymer is reacted with melamine, and then caprolactam is used to The isocyanate group is closed to form a dendritic reinforcing agent, which prevents the reinforcing agent from self-crosslinking in the spinning process and reduces the spinnability and reinforcing effect of the viscose fiber. The obtained dendritic reinforcing agent is blended with the viscose cellulose solution, then the obtained modified viscose fiber is laid into a web, the modified viscose fiber web is activated with sodium hydroxide solution, and finally the activated viscose fiber web is activated. The modified viscose fiber web is subjected to hot-pressing treatment, and the activated dendritic reinforcing agent undergoes ring-opening under the action of hot pressing, and cross-links with the hydroxyl groups on the surface of the viscose fiber, thereby significantly improving the viscose fiber non-woven fabric. strength. The polyurethane segment in the dendritic reinforcement molecule makes the viscose fiber non-woven fabric have good elastic recovery.

Description

technical field [0001] The invention belongs to the technical field of non-woven fabrics, and in particular relates to a high-strength viscose fiber non-woven fabric and a preparation method thereof. Background technique [0002] Viscose fiber is a kind of textile fiber that is widely used at present. It is a man-made fiber produced with natural cellulose as the main raw material. Natural cellulose materials such as cotton, bamboo, and wood pulp provide a wide range of raw material bases for viscose fiber. In addition, certain properties of viscose fiber and natural cotton fiber are very similar, both have good hygroscopicity, dyeability, antistatic, comfortable to wear, have advantages that chemical fibers cannot match, and the product has good wearing performance. However, due to the unique chemical structure and aggregate structure of viscose fiber, it has some obvious disadvantages: its mechanical properties are poor, its strength and elastic modulus are low in wet state...

AI Technical Summary

Problems solved by technology

However, due to the unique chemical structure and aggregate structure of viscose fiber, it has some obvious disadvantages: its mechanical properties are poor, its strength and elastic modulus are low in wet state, and its elastic recovery is poor. Easy to wrinkle and deform, poor abrasion resistance, poor alkali resistance, poor fiber bulkiness, etc., which limit the development and application of viscose fiber

[0003] Invention patent CN103255488A discloses a method for preparing high-strength viscose fibers by using inorganic nano-whiskers or organic nano-whiskers to disperse through dispersion liquid and blending with viscose collagen solution, but inorganic nano-whiskers or organic nano-whiskers are mixed with cellulose It is just pure physical blending, the compatibility of the two is poor, there is a serious loss problem in the spinning forming process, and the reinforcement effect is not very good

Invention patent CN104233510A discloses a kind of amino resin reinforced cellulose fiber and its preparation method, which uses benzomelamine instead of part of melamine to react with formaldehyde, and uses small molecule monofunctional alcohols as end-capping agents to synthesize melamine-formaldehyde resin, and then with Viscose solution blending and spinning, most of the resins synthesized by this method are low-molecular-weight compounds mainly composed of single molecules, which are difficult to form intersections with cellulose molecules, and the compatibility between melamine-formaldehyde resin and cellulose molecules is poor, and it is difficult to achieve reinforcement. Effect

[0004] Invention patent CN106012075B discloses a high-strength viscose fiber and its preparation method, using p-phenylenediamine, phenol or resorcinol to modify melamine formaldehyde resin as a reinforcing agent, and then quickly blending it with viscose solution, Then it is blended with viscose solution for spinning. The modified resin synthesized by this method is prone to self-crosslinking during spinning, and the crosslinking activity with cellulose molecules is low, so the reinforcing effect is not obvious.

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