Preparation method of nano micro cellulose fiber non-woven fabric

Abstract

The invention discloses a preparation method of nano micro cellulose fiber non-woven fabric. The preparation method adopts the following process steps: 1. premixing cellulose and a solvent: smashing the cellulose into powder, then preparing the cellulose and the solvent into uniform mixture according to the mass ratio being (1-3):(9-7); 2. preparing cellulose solution feeding the mixture into a double-screw extruder to prepare spinning solution, enabling the spinning solution to pass through a metering pump, then feeding the spinning solution into a spinning die head, extruding the die spinning solution from a spinneret orifice of the die head to form a fine spinning solution flow; 3. stretching air flow: forming high-pressure hot air to high-speed air flow through an air cavity slit of the spinning die head, flowing the high-speed air flow to the fine spinning solution flow to realize the stretching and thinning of the solution; and 4. forming and conducting postprocessing on non-woven fabric to obtain the nano micro cellulose fiber non-woven fabric. In the steps, the solvent is ionic liquid formed by positive ions and negative ions.

Description

Technical field [0001] The present invention involves a non -woven cloth technology, which is specifically a preparation method for non -woven fabrics of nano cellulose fiber. Background technique [0002] Ultra -fine fibers are one of the rapid development of high -performance fibers in recent years. Due to its large surface area, strong adsorption, warmth, etc., it is called a new generation of fiber with high quality, high -tech content and high value.In recent years, the rapid development of static spinning method has effectively controlled the fineness of the fiber, which reduces the diameter of the ultra-fine fiber to a range of hundreds of nanometer (mostly 100-500nm).EssenceThis non -woven or yarn consisting of Na microfiber is being used in the fields of medical care, super filtering medium, and enhanced composite materials. The application prospects are very broad. [0003] Follow -spray technology is one of the important ways to prepare ultra -fine fiber non -weaving c...

AI Technical Summary

Problems solved by technology

In recent years, the new process of preparing cellulose materials with ionic liquids has attracted people's attention, as patents such as US6824599, CN1417407, CN1491974 and CN1818160A disclose methods for dissolving and processing cellulose with ionic liquids as solvents, but most of these patent documents Using wet or dry-wet spinning to obtain single or multiple continuous fibers, the diameter is relatively thick, usually between 10-100 μm, and the draw ratio is usually less than 5 times; patents US6596033, US6511930, US6306334, US6358461 And US6221487 etc. disclose and utilize the cellulose solution of up to 15% to carry out the preparation of self-adhesive superfine cellulose nonwoven material through melt-blown technology, the average weight of the prepared fiber is lower than 1 denier or lower, showing Inherently low gloss, but the solvent used is NMMO, the conditions for the synthesis of this solvent are relatively harsh, and it is easy to decompose when heated, and it is inconvenient to transport. It requires more investment in safety technology, and the technology used in these patent documents The cellulose solution is prepared by the conventional dissolution method

The currently used cellulose nonwoven fabric processing methods mainly have disadvantages such as long dissolution time, poor continuity, and difficulty in solvent recovery, and the diameter of the prepared fibers is relatively thick, so it is impossible to produce nano-micro-level fibers.