CN1129680C - Process for production of LYOCELL fiber with bamboo material - Google Patents

Abstract

The present invention discloses a method for producing textile fiber by using fast-growing bamboo wood, which comprises the processing steps of pulverizing bamboo wood, pulping the bamboo wood, extracting trash of bamboo pulp in concentrated alkali solutions, rinsing the bamboo pulp, rinsing and purifying the bamboo pulp with chelating agents sufficiently, drying the bamboo pulp to obtain purified bamboo fiber with molecule polymerization degree larger than 800, dissolving the bamboo fiber in N-Methylmorpholine N-oxide monohydrate solution, reducing pressure, heating the bamboo fiber up to the temperature of less than 120 DEG C gradually, dewatering the bamboo fiber, obtaining spinning pulp, extruding the spinning pulp at the temperature of 90 to 130 DEG C to spin and obtaining bamboo LYOCELL fiber by aqueous phase solidification. The technology problem of bamboo LYOCELL fiber is solved in the present invention. The bamboo LYOCELL fiber of the present invention can be used as fine raw fibers of textiles and paper.

Description

Preparation method for processing bamboo LYOCELL fiber from bamboo material

The present invention relates to processes for treating, producing and manufacturing fibrous articles from cellulose-containing feedstocks.

LYOCELL fiber is disclosed, which is composed of cellulose structure, is easy to degrade and is considered as a green environment-friendly fiber with very good comprehensive performance. It has the comfort of cotton fiber, the strength of polyester fiber, the drapability of viscose fiber and the soft texture of silk. The manufacturing method of the wood fiber-containing wood pulp is carried out by taking wood as a raw material, but the wood is taken as the raw material to manufacture the fiber-containing wood pulp, so that a large amount of forest resources which are already shown to be in short supply are consumed, and negative effects are inevitably caused on the sustainable economic development of the society.

Silk, P21-22 of phase 1 of 2000, "search of BTCA finishing Tencel textile Process", the LYOCELL fiber is reported to refer to fiber produced from wood.

LYOCELL, which is also a fiber produced from wood pulp as an object, is discussed in "LYOCELL fiber fabric dyeing and finishing Process discussion" P32-34 of 12 th stage of 1998 "journal of dyeing&printing".

The LYOCELL fiber is also produced from wood pulp as raw material, and is reported in journal of International textile Press, P1998, 2, P4-8, as "LYOCELL products with functionality" and "LYOCELL dye finishing" in P74-77.

According to the search results, no literature records about processing bamboo LYOCELL fibers by bamboo materials are found at present.

The invention aims to provide a preparation method for processing bamboo LYOCELL fiber by using bamboo. The method adopts fast-growing bamboo as a raw material, improves the process according to the characteristics of the bamboo, and prepares the pollution-free LYOCELL fiber with environmental protection significance, thereby creating conditions for protecting wood resources and ecological environment and sustainable development.

The principle of the invention is based on that N-methylmorpholine N-oxide (NMMO) is used as a solvent, pure fiber bamboo pulp slurry with molecular polymerization degree larger than 800 is prepared from bamboo, and then the product is obtained by spinning and water phase solidification.

The invention relates to a preparation method of bamboo LYOCELL fiber processed by bamboo, which is characterized by comprising the following steps in sequence:

1) crushing the bamboo wood;

2) pulping; the raw materials are fully cooked under high pressure at the temperature of 180 ℃ and 160 ℃ in an alkali solution, and are made into bamboo pulp after water washing and oxygen bleaching;

3) further carrying out concentrated alkali impurity removal and rinsing on the bamboo pulp, fully rinsing and purifying by using a chelating agent, and then drying to obtain pure bamboo cellulose with the molecular polymerization degree of more than 800;

4) dissolving pure bamboo cellulose with molecular polymerization degree more than 800 by using a methylmorpholine N-oxide solution, decompressing, gradually heating to a temperature below 120 ℃, and dehydrating to obtain spinning slurry;

5) and extruding and spinning the spinning slurry at the temperature of 90-130 ℃, stretching and solidifying the water phase to obtain the bamboo LYOCELL fiber.

The invention has the following positive effects:

1. compared with viscose, the bamboo LYOCELL fiber overcomes the environmental protection problem caused by low wet strength of the viscose and large production acid liquor amount, and has the prospect of replacing viscose for production;

2. the cost of raw materials is low, the bamboo is used as fast growing wood, the resources are rich, compared with short cotton linters, the cost is reduced by half, and the bamboo is mostly planted in mountainous regions, and the yield per mu is eight times higher than that of cotton;

3. in the steps, a plurality of impurity removal processes are carried out, so that the adverse influence of impurities in the bamboo fibers on spinning is avoided;

4. the obtained bamboo cellulose has low content of small molecules and a molecular polymerization degree of more than 800, and is suitable for being used as a raw material for spinning bamboo LYOCELL fibers;

5. the quality of the bamboo LYOCELL fiber can reach the same level as that of LYOCELL fiber made of wood.

The process of the invention comprises the following steps:

example (b):

1. slicing and crushing a new arrowhead bamboo of one age; putting 100 parts of the mixture into a high-pressure steamer, adding 500 parts of 55 g/L sodium hydroxide solution, adding 20 parts of sodium sulfide, steaming and boiling at 170 ℃ for 5 hours, taking out of the steamer, and washing with water; then chlorine is introduced for bleaching treatment and water washing is carried out; performing supplementary bleaching and water washing by using sodium hypochlorite, rinsing for 2 hours at normal temperature by using 17% sodium hydroxide solution, selecting the concentrated alkali with the concentration range of 3-25% in the conventional range, washing until phenolphthalein does not change color, washing for 1 hour by using 0.1% EDTA chelating agent solution, dehydrating and drying to obtain 20 parts of refined bamboo cellulose, wherein the measured molecular polymerization degree is more than or equal to 800; mixing with 50% N-methylmorpholine N-oxide (NMMO) solvent at a ratio of 1: 20, dissolving, decompressing to less than 0.01Mpa, dehydrating, gradually heating to 90 deg.C, and dissolving completely to obtain spinning slurry; and finally, carrying out extrusion spinning, selecting a spinneret plate with 24 holes and the aperture of 0.1mm, stretching, carrying out water phase solidification, winding, washing with water, and drying to obtain the bamboo LYOCELL fiber.

2. Taking bamboo strips and green scraps of moso bamboos of two to three ages, and slicing and crushing; putting 100 parts of the mixture into a high-pressure steamer, adding 500 parts of 50 g/L sodium hydroxide solution, adding 20 parts of sodium sulfide, steaming at the temperature of 170-; bleaching with sodium hypochlorite solution, washing with water, rinsing with 15% sodium hydroxide solution at normal temperature for 1 hr until phenolphthalein is not discolored, rinsing with 0.1% EDTA chelating agent solution at normal temperature for 1 hr, dehydrating and drying to obtain 18 parts of refined bamboo cellulose with molecular polymerization degree of not less than 800; mixing and dissolving the mixture with 50 percent of NMMO solvent according to the proportion of 1: 18, decompressing to be less than 0.01Mpa, dehydrating, gradually heating to 90 ℃ to completely dissolve the mixture into spinning slurry; and finally, carrying out extrusion spinning, selecting a spinneret plate with 7 holes and the aperture of 0.2m, stretching, carrying out water phase solidification, winding, washing, and drying to obtain the bamboo LYOCELL fiber.

Claims (1)

1. A preparation method for processing bamboo LYOCELL fiber by using bamboo is characterized by comprising the following steps in sequence:

1) crushing the bamboo wood;

2) pulping; the raw materials are fully cooked under high pressure at the temperature of 180 ℃ and 160 ℃ in an alkali solution, and are made into bamboo pulp after water washing and oxygen bleaching;

3) further carrying out concentrated alkali impurity removal and rinsing on the bamboo pulp, fully rinsing and purifying by using a chelating agent, and then drying to obtain pure bamboo cellulose with the molecular polymerization degree of more than 800;

4) dissolving pure bamboo cellulose with molecular polymerization degree more than 800 by using a methylmorpholine N-oxide solution, decompressing, gradually heating to a temperature below 120 ℃, and dehydrating to obtain spinning slurry;

5) and extruding and spinning the spinning slurry at the temperature of 90-130 ℃, stretching and solidifying the water phase to obtain the bamboo LYOCELL fiber.