阅读说明：本技术 一种废水可重复利用的针织布染色工艺 (Knitted fabric dyeing process capable of recycling waste water ) 是由 潘华敏 于 2020-06-11 设计创作，主要内容包括：本发明具体公开了一种废水可重复利用的针织布染色工艺,包括以下步骤：前处理、染色、热洗、脱水、开幅和定型；前处理步骤为：将针织布置于水中,并加入双氧水、冷堆宝、阳离子改性保护剂,在20-40℃下堆置10-15h；阳离子改性保护剂包含以下组分：非离子渗透剂、双氧水稳定剂、去油剂、螯合分散剂、水；染色步骤为：将针织布在30-40℃下,加入活性染料,浴比为1:8-1:10,升到90-98℃,保持35-45分钟,然后降温至30-40℃,得染色针织布、染色排水,染色排水的COD≤30mg/L；染色排水循环到染色步骤回收利用,具有使废水的COD值降低,使染色排水重复利用,减少废水排放的优点。(The invention particularly discloses a knitted fabric dyeing process capable of recycling waste water, which comprises the following steps: pretreatment, dyeing, hot washing, dehydration, scutching and shaping; the pretreatment steps are as follows: putting the knitted fabric into water, adding hydrogen peroxide, cold pad batch and a cation modification protective agent, and piling for 10-15h at 20-40 ℃; the cation modified protective agent comprises the following components: nonionic penetrant, hydrogen peroxide stabilizer, deoiling agent, chelating dispersant and water; the dyeing steps are as follows: adding reactive dye into the knitted fabric at the temperature of 30-40 ℃, heating to 90-98 ℃ at the bath ratio of 1:8-1:10, keeping for 35-45 minutes, then cooling to 30-40 ℃ to obtain dyed knitted fabric, dyeing drainage, wherein the COD of the dyed drainage is less than or equal to 30 mg/L; the dyeing wastewater is recycled to the dyeing step, and the method has the advantages of reducing the COD value of the wastewater, recycling the dyeing wastewater and reducing the wastewater discharge.)

1. The knitted fabric dyeing process capable of recycling the wastewater is characterized in that: which comprises the following steps: pretreatment, dyeing, hot washing, dehydration, scutching and shaping;

the pretreatment steps are as follows: placing knitted fabric in water, adding hydrogen peroxide, cold pad batch and a cation modification protective agent, wherein the mass concentrations are 40-60g/L, 25-35g/L and 7-15g/L respectively, carrying out two-dipping and two-rolling, the liquid carrying rate is 80-100%, and stacking for 10-15h at 20-40 ℃;

the cation modified protective agent is prepared from the following components: 7-9% of non-ionic penetrant, 10-14% of hydrogen peroxide stabilizer, 12-18% of degreaser, 15-25% of chelating dispersant and 40-50% of water;

the dyeing steps are as follows: adding reactive dye into a water bath at the temperature of 30-40 ℃ for a bath ratio of 1:8-1:10, heating to 90-98 ℃, keeping the temperature for 35-45 minutes, cooling to 30-40 ℃, discharging to obtain dyed knitted fabric and dyed drainage, wherein the COD value of the dyed drainage is less than or equal to 30 mg/L;

the dyeing wastewater is recycled to the dyeing step;

wherein, the knitted fabric is prepared by modifying raw material fibers.

2. The knitted fabric dyeing process capable of recycling waste water according to claim 1, characterized in that: the hot washing step comprises the following steps: hot washing the dyed knitted fabric with hot water at 55-65 deg.c for 20-30min in the bath ratio of 1:8-1:10, discharging to obtain hot washed dyed knitted fabric, hot washing and draining water, and recovering and reusing the hot washing and draining water.

3. The knitted fabric dyeing process capable of recycling waste water according to claim 2, characterized in that: the dyeing wastewater is mixed with hot washing wastewater in advance to obtain circulating water, and then the circulating water is recycled to the dyeing step for recycling;

the temperature of the circulating water is adjusted by adding cold water.

4. The knitted fabric dyeing process capable of recycling waste water according to claim 1, characterized in that: the preparation steps of the cation modified protective agent are as follows: adding a nonionic penetrant and a deoiling agent into water, stirring for mutual dissolution, then adding a hydrogen peroxide stabilizer and a chelating dispersant, and stirring until the hydrogen peroxide stabilizer and the chelating dispersant are dissolved to obtain the cation modified protective agent.

5. The knitted fabric dyeing process capable of recycling waste water according to claim 1, characterized in that: the deoiling agent is isomeric tridecanol polyoxyethylene ether or isomeric tridecanol polyoxyethylene ether.

6. The knitted fabric dyeing process capable of recycling waste water according to claim 1, characterized in that: the type of the hydrogen peroxide stabilizer is GN-0090 or JL-36.

Technical Field

The invention relates to the technical field of knitted fabric dyeing, in particular to a knitted fabric dyeing process capable of recycling waste water.

Background

The knitted fabric is a fabric formed by bending yarns into loops by using a knitting needle and mutually stringing and sleeving the loops, namely a warp knitted fabric and a weft knitted fabric. The knitted fabric has the characteristics of soft texture, moisture absorption, ventilation, sweat releasing, heat preservation and the like, and most of the knitted fabric has excellent elasticity and extensibility. Compared with woven fabric, the method has the characteristics of high yield and suitability for small-batch production. The knitted dress is comfortable to wear, fits body, has no sense of constraint and can fully embody the curve of the human body.

In the production process of the knitted fabric, the fibers need to be modified firstly, then the fibers are woven into yarns, the yarns are bent into loops and are mutually sleeved in series to form the knitted fabric, and then the knitted fabric is dyed into required colors according to market requirements. Because the fiber is fluffy and has larger specific surface area, the prior art modifies the fiber, thereby leading the subsequent knitted fabric to achieve better modification effect. The fiber modification is a process of making the surface of the fiber have positive charges, so that the fiber can be better colored under the action of electrostatic attraction during dyeing. However, before the knitted fabric is dyed, the knitted fabric needs to be pretreated, namely, oil, dirt and other accompanying materials on the surface of the fiber are cleaned in the production process of the knitted fabric, so that the dyeing effect of the attached materials on the surface is not reduced.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a knitted fabric dyeing process capable of recycling waste water, which has the advantages of reducing the COD value of the waste water, recycling dyeing drainage and reducing waste water discharge.

In order to achieve the first object, the invention provides the following technical scheme:

the knitted fabric dyeing process capable of recycling the wastewater is characterized in that: which comprises the following steps: pretreatment, dyeing, hot washing, dehydration, scutching and shaping;

the pretreatment steps are as follows: placing knitted fabric in water, adding hydrogen peroxide, cold pad batch and a cation modification protective agent, wherein the mass concentrations are 40-60g/L, 25-35g/L and 7-15g/L respectively, carrying out two-dipping and two-rolling, the liquid carrying rate is 80-100%, and stacking for 10-15h at 20-40 ℃;

the cation modified protective agent is prepared from the following components: 7-9% of non-ionic penetrant, 10-14% of hydrogen peroxide stabilizer, 12-18% of degreaser, 15-25% of chelating dispersant and 40-50% of water;

the dyeing steps are as follows: adding reactive dye into a water bath at the temperature of 30-40 ℃ for a bath ratio of 1:8-1:10, heating to 90-98 ℃, keeping the temperature for 35-45 minutes, cooling to 30-40 ℃, discharging to obtain dyed knitted fabric and dyed drainage, wherein the COD value of the dyed drainage is less than or equal to 30 mg/L;

the dyeing wastewater is recycled to the dyeing step;

wherein, the knitted fabric is prepared by modifying raw material fibers.

By adopting the technical scheme, the fiber is modified to prepare the knitted fabric, so that the surface of the knitted fabric is provided with positive charges, and the knitted fabric is better colored under the action of electrostatic attraction. In the traditional pretreatment step, the oil stain on the surface of the knitted fabric can be removed only by adding the auxiliary agent of strong electric ions such as caustic soda and the like, but the substances of the strong electric ions can influence the positive charge on the surface of the knitted fabric, so that the positive charge on the surface of the knitted fabric is reduced, the electrostatic attraction between the knitted fabric and dye is weakened, and the coloring rate of the knitted fabric is reduced; according to the invention, the cationic modified protective agent is added in the pretreatment step, and the weak-current ionic auxiliary agent is used, so that the positive charge of the knitted fabric is less influenced, the dyeing rate of the knitted fabric can be improved, and the auxiliary agents such as a leveling agent, soda ash, a chelating dispersant and the like are not required to be additionally added in the dyeing step to improve the dyeing rate of the knitted fabric, so that the COD value of dyeing drainage is greatly reduced, and the aim of recycling is fulfilled.

Preferably, the hot washing step is as follows: the hot washing step comprises the following steps: hot washing the dyed knitted fabric with hot water at 55-65 deg.c for 20-30min in the bath ratio of 1:8-1:10, discharging to obtain hot washed dyed knitted fabric, hot washing and draining water, and recovering and reusing the hot washing and draining water.

Through adopting above-mentioned technical scheme, because the positive charge on looped fabric surface is more, make the looped fabric great with the combination effort of dyestuff, in the hot washing step, the loose colour on looped fabric surface is less, and hot washing water can recycle and use to the dyeing step.

Preferably, the dyeing wastewater is mixed with hot washing wastewater in advance to obtain circulating water, and then the circulating water is recycled to the dyeing step for recycling; the temperature of the circulating water is adjusted by adding cold water.

Through adopting above-mentioned technical scheme, through mixing dyeing drainage and hot washing drainage after, recycle again can save the equipment that alone carries out the collection to hot washing drainage, can practice thrift manufacturing cost, generally, the temperature of circulating water can be higher, cools down through adding the water in the lower water of temperature to the collecting pit, can make cooling rate faster, is favorable to industrial production efficiency.

Preferably, the cation modified protective agent is prepared by the following components: 8% of non-ionic penetrant, 6% of hydrogen peroxide stabilizer, 6% of diethylenetriamine pentamethylenephosphonic acid, 20% of maleic acid methyl acrylate copolymer, 15% of isomeric alcohol polyoxyethylene ether and 45% of water.

By adopting the technical scheme, the cationic modified protective agent can be prepared by compounding the raw materials of the nonionic type and the weak ionic type, and the oil stain on the surface of the knitted fabric can be better cleaned by adding the cationic modified protective agent, so that the positive charge on the surface of the knitted fabric is less influenced.

Preferably, the preparation steps of the cation modified protective agent are as follows: adding a nonionic penetrant and a deoiling agent into water, stirring for mutual dissolution, then adding a hydrogen peroxide stabilizer and a chelating dispersant, and stirring until the hydrogen peroxide stabilizer and the chelating dispersant are dissolved to obtain the cation modified protective agent.

By adopting the technical scheme, after the nonionic penetrant and the degreaser are dissolved in water, the hydrogen peroxide stabilizer and the chelating agent with poor dissolving effect in water are added for dissolution, and the nonionic penetrant and the degreaser can play a role of a surfactant, so that the dissolving speed of the hydrogen peroxide stabilizer and the chelating agent can be accelerated.

Preferably, the deoiling agent is isomeric tridecanol polyoxyethylene ether or isomeric tridecanol polyoxyethylene ether.

By adopting the technical scheme, when the heterogeneous tridecanol polyoxyethylene ether or the heterogeneous tridecanol polyoxyethylene ether is used for preparing the cationic modified protective agent, the knitted fabric can be subjected to better pretreatment effect.

Preferably, the hydrogen peroxide stabilizer is GN-0090 or JL-36 in type.

By adopting the technical scheme, when the cationic modification protective agent is prepared by using the hydrogen peroxide stabilizer with the model number of GN-0090 or JL-36, the knitted fabric can be subjected to better pretreatment effect.

In conclusion, the invention has the following beneficial effects:

(1) according to the invention, the cationic modified protective agent, the nonionic auxiliary agent or the weak ionic auxiliary agent are added in the pretreatment step of the knitted fabric, so that the influence of the pretreatment step on the positive charge on the surface of the knitted fabric is small, the electrostatic action between the knitted fabric and the dye is increased, the coloring rate of the knitted fabric is greatly improved, the COD value of dyeing drainage is still less than or equal to 30 when the COD value of the dyeing drainage is recycled for 10 times, the wastewater discharge is greatly reduced, and the requirements of energy conservation, emission reduction and environmental protection are met.

(2) According to the invention, the cationic modified protective agent is added, so that the positive charge loss of the surface of the knitted fabric in the pretreatment process is small, the electrostatic acting force between the knitted fabric and the dye is large, the combination between the knitted fabric and the dye is firm, the loose color on the surface of the knitted fabric is small, the COD value of hot washing water is small, the hot washing water and dyeing drainage water are mixed and circulated, and the cyclic application is carried out in the dyeing step, so that the purposes of energy conservation and emission reduction are achieved.

Detailed Description

The present invention will be described in further detail with reference to examples.

Raw materials

The nonionic penetrant of the invention is sorbitan fatty acid ester with the model of S-80, and the manufacturer is a Heian petrochemical plant in Jiangsu province;

raw material fibers: cotton fibers;

hydrogen peroxide stabilizer: the model is GN-0090, and the manufacturer is Shandong Huayou Water treatment technology Co., Ltd; the model is JL-36, and the manufacturer is ZiBoyunchuan chemical Co Ltd;

deoiling agent: the isomeric tridecanol polyoxyethylene ether is E-1304, and the manufacturer is a Heian petrochemical plant in Jiangsu province; isomeric dodecyl alcohol polyoxyethylene ether, model number E-1005, and the manufacturer is Heian petrochemical plant of Jiangsu province;

chelating dispersant: maleic acid-acrylic acid copolymer with the density of more than or equal to 1.18g/mL, and the manufacturer is a Taihe chemical factory in the market of the jujube village; cold batch: the model is TF-120, and the manufacturer is Jiexi industry Co., Ltd;

reactive dyes: the type is reactive red M-88, and the manufacturer is Jinan Longteng dye chemical Co., Ltd;

pH stabilizer: sodium carbonate-sodium bicarbonate buffer solution with the volume ratio of 1:1 and the concentration of 0.1M;

quaternary ammonium salt compounds: 3-chloro-2-hydroxypropyl trimethyl ammonium chloride, the manufacturer is Shandong oil and fat chemistry Co., Ltd; cationic modifier: the cationic polyacrylamide has the model of C635, and the manufacturer is Kaifeng hong Yuan water treatment technology company Limited in Henan.

Preparation example 1

The components and the contents of the components of the cation modification protective agent of the preparation example 1 are shown in the table 1, and the preparation steps of the cation modification protective agent are as follows: adding a nonionic penetrant and a deoiling agent into water, stirring for mutual dissolution, then adding a hydrogen peroxide stabilizer and a chelating dispersant, and stirring until the hydrogen peroxide stabilizer and the chelating dispersant are dissolved to obtain the cation modified protective agent. Wherein the type of the hydrogen peroxide stabilizer is GN-0090, and the deoiling agent adopts isomeric tridecanol polyoxyethylene ether.

TABLE 1 raw material components and amounts (kg) of the components of preparation examples 1 to 3

Raw materials	Preparation example 1	Preparation example 2	Preparation example 3
				Non-ionic penetrant	7	8	9
Hydrogen peroxide stabilizer	10	12	14
				Deoiling agent	18	15	12
Chelating dispersants	15	20	25
				Water (W)	50	45	40

Preparation example 2

The components and the contents of the components of the cation modification protective agent of the preparation example 2 are shown in the table 1, and the preparation steps of the cation modification protective agent are as follows: adding a nonionic penetrant and a deoiling agent into water, stirring for mutual dissolution, then adding a hydrogen peroxide stabilizer and a chelating dispersant, and stirring until the hydrogen peroxide stabilizer and the chelating dispersant are dissolved to obtain the cation modified protective agent. Wherein the model of the hydrogen peroxide stabilizer is JL-36, and the deoiling agent adopts isomeric dodecyl alcohol polyoxyethylene ether.

Preparation example 3

The components and the content of the components of the cation modified protective agent of the preparation example 3 are shown in the table 1, and the preparation steps of the cation modified protective agent are as follows: adding a nonionic penetrant and a deoiling agent into water, stirring for mutual dissolution, then adding a hydrogen peroxide stabilizer and a chelating dispersant, and stirring until the hydrogen peroxide stabilizer and the chelating dispersant are dissolved to obtain the cation modified protective agent. Wherein the type of the hydrogen peroxide stabilizer is GN-0090, and the deoiling agent adopts isomeric dodecyl alcohol polyoxyethylene ether.

Preparation example 4

The preparation procedure of the strong activator prepared in preparation example 4 was: adding 8kg of non-ionic penetrant, 5kg of PH value stabilizer with the model number of GN-0090 and 10kg of quaternary ammonium salt compound into 80kg of water, and stirring and dissolving to obtain the strong activator.

The knitted fabric is modified by adopting modified raw material fibers, and the modified raw material fibers are adopted to prepare the modified knitted fabric. The modified raw material fiber comprises the following specific preparation steps:

1) putting raw material fibers to be modified into a cylinder body, adding water into the cylinder body, controlling the weight ratio of the raw material fibers to the water to be 1:10, and stirring to immerse the raw material fibers into the water to obtain a mixture a;

2) adding caustic soda and a strong activating agent into the mixture a, wherein the mass fractions of the added caustic soda and the added strong activating agent are 1% and 1.5%, respectively, stirring while adding, and continuing to react for 20min after the addition is finished to obtain a mixture b;

3) taking the raw material fiber in the step 2) out of the cylinder body, adding a cationic modifier into the cylinder body, stirring uniformly, putting the taken raw material fiber into the cylinder body, and stirring for reacting for 50min to obtain a mixture c;

4) washing the raw material fiber obtained in the step 3), then putting the raw material fiber into a dehydrator for dehydration, and after the dehydration is finished, putting the raw material fiber into a dryer for drying treatment at the temperature of 100 ℃ to obtain the modified raw material fiber.