阅读说明：本技术 一种利用纯棉牛仔布碎织物制造溶解浆的方法 (Method for preparing dissolving pulp by using pure cotton jean broken fabric ) 是由 熊荣洪 熊文杰 于 2019-12-13 设计创作，主要内容包括：一种利用纯棉牛仔布碎织物制造溶解浆的方法,包括以下步骤：剥色：加入浓度为80％的亚氯酸钠,然后加入渗透剂,使溶液PH值达到3.5-4.2,浴比达到1:5-1:10,浸泡3-5小时；漂白；脱氯：加入一定量的水,然后加入亚硫酸钠和纯碱,保持浴比为1:5-1:10,温度升到50℃-60℃,保温清洗30-50分钟；软化：将经过脱氯步骤的纯棉牛仔布碎织物粉碎,然后放入软化剂内浸泡3-4小时；酸处理：将经过软化处理的纯棉牛仔布碎加入浓度为10％-15％盐酸,浸泡20-60分钟即得到溶解浆。(A method for manufacturing dissolving pulp by using pure cotton jean broken fabric comprises the following steps: stripping: adding 80% sodium chlorite, adding penetrant to make the pH value of the solution reach 3.5-4.2, the bath ratio reach 1:5-1:10, and soaking for 3-5 hours; bleaching; dechlorination: adding a certain amount of water, then adding sodium sulfite and sodium carbonate, keeping the bath ratio at 1:5-1:10, heating to 50-60 ℃, and keeping the temperature and cleaning for 30-50 minutes; softening: crushing the pure cotton jean fabric subjected to the dechlorination step, and then putting the crushed pure cotton jean fabric into a softening agent to be soaked for 3-4 hours; acid treatment: the softened pure cotton jean is crushed and added with hydrochloric acid with the concentration of 10-15 percent, and the mixture is soaked for 20-60 minutes to obtain dissolving pulp.)

1. A method for manufacturing dissolving pulp by using pure cotton jean broken fabric is characterized by comprising the following steps:

stripping: adding 80% sodium chlorite, adding penetrant to make the pH value of the solution reach 3.5-4.2, the bath ratio reach 1:5-1:10, and soaking for 3-5 hours;

bleaching: adding bleaching liquid, wherein the bleaching liquid comprises 50-90% of absolute ethyl alcohol organic solvent by volume fraction, 5-50% of water by volume fraction, 2-5g/L bleaching agent by volume fraction, 1-3g/L fatty alcohol polyoxyethylene ether by volume fraction and 3-7g oxygen bleaching stabilizer NCS-PB by volume fraction, and the bath ratio is kept between 2: 20-1: 30, slowly heating to 85 ℃ at the speed of 1.5 ℃/min, preserving the temperature for 120 minutes, then slowly cooling to below 40 ℃ at the speed of 2 ℃/min, and draining the residual solution;

dechlorination: adding a certain amount of water, then adding sodium sulfite and sodium carbonate, keeping the bath ratio at 1:5-1:10, heating to 50-60 ℃, and keeping the temperature and cleaning for 30-50 minutes;

softening: crushing the pure cotton jean fabric subjected to the dechlorination step, and then putting the crushed pure cotton jean fabric into a softening agent to be soaked for 3-4 hours;

acid treatment: the softened pure cotton jean is crushed and added with hydrochloric acid with the concentration of 10-15 percent, and the mixture is soaked for 20-60 minutes to obtain dissolving pulp.

2. The method for manufacturing dissolving pulp by using pure cotton denim broken fabric according to claim 1, characterized in that: in the softening step, the softening agent solution comprises the following components in parts by weight: 10-20 parts of n-butyl alcohol, 5-10 parts of kang' ke oil, 4-6 parts of fatty acid amide, 3-5 parts of rubine, 2-4 parts of quaternary ammonium salt and 80-200 parts of deionized water.

3. The method for manufacturing dissolving pulp by using pure cotton denim broken fabric according to claim 1, characterized in that: in the stripping step, the weight of the added sodium chlorite accounts for 4-6% of the weight of the pure cotton denim broken fabric before the stripping step, and the weight of the added penetrant accounts for 0.2-0.5% of the weight of the pure cotton denim broken fabric before the stripping step.

4. The method for manufacturing dissolving pulp by using pure cotton denim broken fabric according to claim 1, characterized in that: in the dechlorination step, the weight of the added sodium sulfite accounts for 1-1.5% of the weight of the pure cotton denim fabric before the stripping step, and the weight of the added soda accounts for 1-1.5% of the weight of the pure cotton denim fabric before the stripping step.

5. The method for manufacturing dissolving pulp by using pure cotton denim broken fabric according to claim 1, characterized in that:

stripping: adding 80% sodium chlorite, adding penetrant to make the pH value of the solution reach 3.5, the bath ratio reach 1:5, and soaking for 3 hours; the weight of the added sodium chlorite accounts for 4% of the weight of the pure cotton denim broken fabric, and the weight of the added penetrant accounts for 0.2% of the weight of the pure cotton denim broken fabric;

bleaching: adding bleaching liquid, wherein the bleaching liquid comprises 50% volume fraction of absolute ethyl alcohol organic solvent, 5% volume fraction of water, 2g/L concentration bleaching agent, 1g/L concentration fatty alcohol polyoxyethylene ether and 3g concentration oxygen bleaching stabilizer NCS-PB, keeping the bath ratio at 1:10, slowly heating to 85 ℃ at the speed of 1.5 ℃/min, keeping the temperature for 120 minutes, slowly cooling to below 40 ℃ at the speed of 2 ℃/min, and draining the residual liquid;

dechlorination: adding a certain amount of water, then adding sodium sulfite and sodium carbonate, keeping the bath ratio at 1:5, heating to 50 ℃, and keeping the temperature and cleaning for 30 minutes; the weight of the added sodium sulfite accounts for 1% of the weight of the pure cotton denim fabric before the stripping step, and the weight of the added soda accounts for 1% of the weight of the pure cotton denim fabric before the stripping step;

softening: crushing the pure cotton jean fabric subjected to the dechlorination step, and then putting the crushed pure cotton jean fabric into a softening agent to be soaked for 3 hours; the softener solution comprises the following components in parts by weight: 10 parts of n-butyl alcohol, 5 parts of kang' ke oil, 4 parts of fatty acid amide, 3 parts of rubusine, 2 parts of quaternary ammonium salt and 80 parts of deionized water;

acid treatment: and (3) crushing the softened pure cotton jean, adding 10% hydrochloric acid, and soaking for 30 minutes to obtain dissolving pulp.

6. The method for manufacturing dissolving pulp by using pure cotton denim broken fabric according to claim 1, characterized in that:

stripping: adding 80% sodium chlorite, adding penetrant to make the pH value of the solution reach 3.8, the bath ratio reach 1:7, and soaking for 4 hours; the weight of the added sodium chlorite accounts for 5% of the weight of the pure cotton denim broken fabric, and the weight of the added penetrant accounts for 0.35% of the weight of the pure cotton denim broken fabric;

bleaching: adding bleaching liquid, wherein the bleaching liquid comprises 70% of absolute ethyl alcohol organic solvent by volume fraction, 30% of water by volume fraction, 4g/L of bleaching agent by volume fraction, 2g/L of fatty alcohol-polyoxyethylene ether by volume fraction and 5g of oxygen bleaching stabilizer NCS-PB by volume fraction, and keeping the bath ratio of 1: 20, slowly heating to 85 ℃ at the speed of 1.5 ℃/min, preserving the temperature for 120 minutes, then slowly cooling to below 40 ℃ at the speed of 2 ℃/min, and draining the residual solution;

dechlorination: adding a certain amount of water, then adding sodium sulfite and sodium carbonate, keeping the bath ratio at 1:7.5, heating to 55 ℃, and keeping the temperature and cleaning for 40 minutes; the weight of the added sodium sulfite accounts for 1.25 percent of the weight of the pure cotton denim fabric before the stripping step, and the weight of the added soda accounts for 1.25 percent of the weight of the pure cotton denim fabric before the stripping step;

softening: crushing the pure cotton jean fabric subjected to the dechlorination step, and then putting the crushed pure cotton jean fabric into a softening agent to be soaked for 3.5 hours; the softener solution comprises the following components in parts by weight: 15 parts of n-butyl alcohol, 7 parts of kang' ke oil, 5 parts of fatty acid amide, 4 parts of rubusine, 3 parts of quaternary ammonium salt and 130 parts of deionized water;

acid treatment: and (3) crushing the softened pure cotton jean, adding 12.5% hydrochloric acid, and soaking for 40 minutes to obtain dissolving pulp.

7. The method for manufacturing dissolving pulp by using pure cotton denim broken fabric according to claim 1, characterized by comprising the following steps:

stripping: adding 80% sodium chlorite, adding penetrant to make the pH value of the solution reach 4.2, the bath ratio reach 1:10, and soaking for 5 hours; the weight of the added sodium chlorite accounts for 4-6% of the weight of the pure cotton denim broken fabric, and the weight of the added penetrant accounts for 0.5% of the weight of the pure cotton denim broken fabric;

bleaching: adding bleaching liquid, wherein the bleaching liquid comprises an absolute ethyl alcohol organic solvent with the volume fraction of 90%, water with the volume fraction of 50%, a bleaching agent with the concentration of 5g/L, fatty alcohol-polyoxyethylene ether with the concentration of 3g/L and an oxygen bleaching stabilizer NCS-PB with the concentration of 7g, and the bath ratio is kept to be 1: 30, slowly heating to 85 ℃ at the speed of 1.5 ℃/min, preserving the temperature for 120 minutes, then slowly cooling to below 40 ℃ at the speed of 2 ℃/min, and draining the residual solution;

dechlorination: adding a certain amount of water, then adding sodium sulfite and sodium carbonate, keeping the bath ratio at 1:10, heating to 60 ℃, and keeping the temperature and cleaning for 50 minutes; the weight of the added sodium sulfite accounts for 1.5 percent of the weight of the pure cotton denim fabric before the stripping step, and the weight of the added soda accounts for 1.5 percent of the weight of the pure cotton denim fabric before the stripping step;

softening: crushing the pure cotton jean fabric subjected to the dechlorination step, and then putting the crushed pure cotton jean fabric into a softening agent to be soaked for 4 hours; the softener solution comprises the following components in parts by weight: 20 parts of n-butyl alcohol, 10 parts of kang' ke oil, 6 parts of fatty acid amide, 5 parts of rubusine, 4 parts of quaternary ammonium salt and 200 parts of deionized water;

acid treatment: and (3) crushing the softened pure cotton jean, adding hydrochloric acid with the concentration of 15%, and soaking for 60 minutes to obtain dissolving pulp.

Technical Field

The invention belongs to the technical field of waste textile fabric recovery, and particularly relates to a method for preparing dissolving pulp by using pure cotton jean broken fabrics.

Background

In the production process of jeans wear, for example: the procedures of warp sizing, jean weaving, jean after finishing, clothing making, washing and the like can generate a large amount of leftover bits and pieces, defective products and the like. These leftover bits and pieces belong to the textile industry solid waste, which we collectively refer to as the pure cotton denim fabric.

If the pure cotton jean broken fabric is treated as waste, the waste is caused, and the environmental pollution is also caused. In the prior art, the method for preparing the dissolving pulp from the pure cotton denim broken fabric is too simple, the ash content is high, the content of methyl cellulose is low, and the prepared dissolving pulp has no high utilization value.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a method for manufacturing dissolving pulp by using pure cotton denim broken fabric.

In order to achieve the purpose, the technical scheme of the invention comprises the following steps:

stripping: adding 80% sodium chlorite, adding penetrant to make the pH value of the solution reach 3.5-4.2, the bath ratio reach 1:5-1:10, and soaking for 3-5 hours;

bleaching: adding bleaching liquid, wherein the bleaching liquid comprises 50-90% of absolute ethyl alcohol organic solvent by volume fraction, 5-50% of water by volume fraction, 2-5g/L bleaching agent by volume fraction, 1-3g/L fatty alcohol polyoxyethylene ether by volume fraction and 3-7g oxygen bleaching stabilizer NCS-PB by volume fraction, and the bath ratio is kept between 2: 20-1: 30, slowly heating to 85 ℃ at the speed of 1.5 ℃/min, preserving the temperature for 120 minutes, then slowly cooling to below 40 ℃ at the speed of 2 ℃/min, and draining the residual solution;

dechlorination: adding a certain amount of water, then adding sodium sulfite and sodium carbonate, keeping the bath ratio at 1:5-1:10, heating to 50-60 ℃, and keeping the temperature and cleaning for 30-50 minutes;

softening: crushing the pure cotton jean fabric subjected to the dechlorination step, and then putting the crushed pure cotton jean fabric into a softening agent to be soaked for 3-4 hours;

acid treatment: the softened pure cotton jean is crushed and added with hydrochloric acid with the concentration of 10-15 percent, and the mixture is soaked for 20-60 minutes to obtain dissolving pulp.

Preferably, in the softening step, the softener solution comprises the following components in parts by weight: 10-20 parts of n-butyl alcohol, 5-10 parts of kang' ke oil, 4-6 parts of fatty acid amide, 3-5 parts of rubine, 2-4 parts of quaternary ammonium salt and 80-200 parts of deionized water.

Preferably, in the stripping step, the weight of the added sodium chlorite accounts for 4-6% of the weight of the pure cotton jean broken fabric before the stripping step, and the weight of the added penetrant accounts for 0.2-0.5% of the weight of the pure cotton jean broken fabric before the stripping step.

Preferably, in the dechlorination step, the weight of the added sodium sulfite accounts for 1-1.5% of the weight of the pure cotton jean broken fabric before the stripping step, and the weight of the added soda accounts for 1-1.5% of the weight of the pure cotton jean broken fabric before the stripping step.

Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:

1. the steps of stripping and dechlorination are added, the gray level and the iron content of the dissolving pulp are further reduced, and the whiteness of the dissolving pulp is increased.

2. The softening step is added, so that the content of alpha cellulose and the dynamic viscosity are greatly improved.

3. In the bleaching process, the bleaching agent is used, compared with the bleaching process using sodium hypochlorite in the common process, the bleaching process has better bleaching effect, and the whiteness of the finished product is improved.

Detailed Description

The present invention will be further described in detail with reference to the following specific examples, which are carried out on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are provided, but the present invention is not limited to the following examples.