Preparation method of energy-saving, consumption-reducing, green and environment-friendly knitted fabric

Abstract

The preparation method of the energy-saving, consumption-reducing, green and environment-friendly knitted fabric comprises the following working procedures of raw material selection, scouring and bleaching pretreatment, dyeing, liquid ammonia treatment, finishing and tentering and preshrinking. In the raw material selection step, natural fibers, renewable and degradable regenerated cellulose or recycled chemical fibers are adopted as raw materials; in the step of boiling and bleaching pretreatment, composite biological enzyme, a biological penetrating agent, activating enzyme, an activating enzyme protective agent, a refining agent and hydrogen peroxide are adopted for treatment, acid washing is conducted after drainage, and hot water washing is not needed. A novel environment-friendly scouring and bleaching process is adopted, the process is improved aiming at a pretreatment link, firstly, the discharge of alkaline wastewater in the scouring and bleaching process is reduced, and the treatment difficulty is reduced; compared with a traditional soda boiling process, hot washing for alkali removal is not needed, water resources are saved, and the boiling-off time is shortened; the temperature required by the boiling-off reaction is reduced, the energy consumption in the production link is reduced, the environment is effectively protected, and the carbon emission is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of textiles, and in particular relates to a method for preparing knitted fabrics that is energy-saving, consumption-reducing, and green and environmentally friendly. Background Art

[0002] As a vital livelihood industry, my country's textile industry occupies a significant international market share. After more than 40 years of development, China has become the world's largest producer, consumer, and trader of textiles and clothing. Its fiber processing volume exceeds 50% of the global total, and its total textile and clothing exports exceed one-third of the world's total. While the textile and clothing industry generates enormous economic benefits, it also brings with it problems such as environmental pollution and resource waste. Therefore, the application of green, low-carbon, and environmentally friendly technologies in the textile industry is crucial to achieving sustainable development.

[0003] Patent CN107130353A proposes a preparation process for blended environmentally friendly knitted fabrics, which uses a variety of ecological fibers to blend and weave knitted fabrics with renewable and low-carbon environmental protection concepts. However, the blending of multiple raw materials will cause uneven dyeing of the fabric, making it difficult to meet the high-quality requirements of the product. Moreover, this process only optimizes ecological raw materials, and the entire production process does not adopt green and environmentally friendly production processes, so it cannot be called environmentally friendly knitted fabrics.

[0004] Patent CN102587110A proposes a fast, energy-saving and emission-reducing pre-dyeing and finishing method, which uses caustic soda and hydrogen peroxide to perform cold-batch impurity removal treatment on fabrics at room temperature, achieving energy conservation and emission reduction in pre-treatment. However, this pre-treatment process still produces a large amount of alkaline wastewater, which cannot meet the needs of green and environmentally friendly production. In addition, the cold-batch impurity removal process takes too long, resulting in very low production efficiency and being unable to meet the needs of large-scale production with fast delivery dates.

[0005] Patent CN118854676A proposes a production process for low-carbon yarn-dyed fabrics, which reduces energy consumption in cheese yarn dyeing, sizing and other processes for woven fabrics. This process is specifically designed for cheese yarn woven fabrics. Weaving and knitting processes are completely different production systems, and there is no reference for knitted piece-dyed fabrics. In addition, this weaving process has a long production cycle and high cost. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a method for preparing knitted fabrics that is energy-saving, consumption-reducing, green and environmentally friendly. This process effectively promotes energy conservation and emission reduction in the fabric production process, and the process is environmentally friendly and sustainable; it reduces the difficulty of wastewater treatment, reduces environmental pollution, ensures the hand quality of the fabric, shortens the process time, and has high economic benefits.

[0007] The energy-saving and consumption-reducing green and environmentally friendly fabric preparation method described in the present invention is applicable to the vast majority of cotton-containing knitted fabrics and is in line with the concept of green development. ① Improve the process in the pre-treatment link, first reduce the discharge of alkaline wastewater in the scouring and bleaching process, reduce its treatment difficulty, and reduce the reaction temperature in the scouring process; compared with the traditional alkali boiling process, no hot washing is required to remove the alkali, saving water resources and shortening the scouring time; reduce the temperature required for the scouring reaction, reduce the energy consumption in the production link, effectively achieve environmental protection, and reduce carbon emissions. ② Select sustainable, recycled, green and environmentally friendly raw materials to effectively contribute to environmental protection and sustainability. ③ Use bio-based additives to replace the originally non-renewable petrochemical additives in the finishing process, effectively contributing to sustainable development.

[0008] The energy-saving, consumption-reducing, green and environmentally friendly knitted fabric preparation method of the present invention comprises the following steps:

[0009] Raw material selection → scouring and bleaching pre-treatment → dyeing → liquid ammonia → finishing and stenting → pre-shrinking;

[0010] Or, raw material selection → scouring and bleaching pre-treatment, whitening bath → liquid ammonia → finishing and stentering → pre-shrinking;

[0011] Or, raw material selection → washing → scouring and bleaching pre-treatment → dyeing → liquid ammonia → finishing and stentering → pre-shrinking;

[0012] The raw material selection is as follows: the raw materials are natural fibers, renewable and degradable regenerated cellulose or recycled chemical fibers;

[0013] The scouring and bleaching pre-treatment does not use caustic soda, but adopts composite biological enzyme, biological penetrant, activated enzyme, activated enzyme protective agent, refining agent and hydrogen peroxide for treatment, and directly carries out acid washing without hot water washing after drainage.

[0014] The raw material options include pure cotton, cotton / regenerated cellulose fiber, recycled polyester (Global Recycling Standard GRS certified for textiles), bio-based two-component composite elastic polyester SORONA (37% bio-based source), etc.

[0015] The scouring and bleaching pre-treatment process is as follows:

[0016] (1) Put the fabric into the tank with warm water at 50℃~60℃, add 1~2g / L of biological penetrant, 0.3~0.5g / L of activated enzyme protective agent, and 0.5~1g / L of refining agent, and keep it for 3~5 minutes;

[0017] (2) Add 7-8 g / L of compound biological enzyme after warm water dissolution, keep it for 3-5 minutes, add 2-3 g / L of hydrogen peroxide, 1-1.5 g / L of activated enzyme, raise the temperature to 75-80 ° C and keep it for 35-40 minutes, cool it to 50-60 ° C and drain it;

[0018] (3) After draining, re-inject water, add 1.4-2 g / L of acetic acid, keep it for 3-5 minutes, then add 0.2-0.4 g / L of deoxygenase, raise the temperature to 50-55°C, keep it for 30-35 minutes, then drain and complete the bleaching.

[0019] The composite biological enzyme is SA-ALK, the biological permeant is SA-PEN, and the activating enzyme DM-8656 is added to reduce the scouring reaction temperature.

[0020] The warm water material is as follows: the composite biological enzyme powder is put into warm water at 50-60° C. and stirred for 3-5 minutes.

[0021] After the warm water is added to the material, the composite biological enzyme is added at a uniform speed within 5 to 6 minutes.

[0022] The heating rate of step (2) is 2.5-3°C / min.

[0023] The cooling rate of step (2) is 2 to 2.5°C / min.

[0024] In the finishing and stentering process, a bio-based hydrophilic silicone oil softener is added to perform softening treatment.

[0025] The finishing and stenting process adds bio-based hydrophilic silicone oil softener GST 575S replaces conventional petroleum-based softeners. The tentering speed in the finishing process is 20m / min-30m / min, the pressure is 25bar-35bar, and the drying room temperature is 135℃-145℃. Additives include 3g / L-5g / L neutralized acid PH-X and 30-40g / L of bio-based hydrophilic silicone oil softener RUCOFIN GST 575S, with the balance being water.

[0026] The present invention adopts liquid ammonia finishing instead of alkali liquid mercerizing, and the liquid ammonia process speed is 40m / min-50m / min.

[0027] The speed of the pre-shrinking process is 20-30m / min, and the temperature of the rubber blanket and the wool blanket is 90℃~100℃.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention uses natural fibers, renewable and degradable regenerated cellulose or recycled chemical fibers as raw materials. The raw materials can be decomposed into harmless substances or recycled and reused, thereby reducing environmental pollution pressure.

[0030] 2. The scouring and bleaching pre-treatment process of the present invention reduces the discharge of alkaline wastewater during the scouring and bleaching process and reduces the difficulty of its treatment. Compared with the traditional scouring and bleaching process, it does not require hot washing to remove alkali, saves water resources, shortens the scouring time, lowers the temperature required for the scouring reaction, reduces energy consumption in the production process, and is environmentally friendly.

[0031] 3. Compared to traditional scouring and bleaching processes, this method offers lower temperatures, shorter processing times, and higher efficiency. Because the scouring and bleaching process utilizes biological enzymes, which are highly specific catalysts that act only on specific substrates, it can remove various impurities, improve whiteness and wettability, and achieve a consistent wool effect, facilitating subsequent dyeing. Since the fabric is not treated with soda ash throughout the process, damage to cellulose fibers like cotton is minimized, thereby maintaining high fabric strength, increasing the fabric's wear resistance, and resulting in a fuller, more textured feel.

[0032] 4. The present invention adopts liquid ammonia finishing technology instead of alkali mercerizing finishing, and 99% of the liquid ammonia is recycled and reused, avoiding the energy waste and environmental pollution problems caused by the treatment of textile caustic soda wastewater. The traditional petroleum-based softener is replaced by a hydrophilic silicone oil softener derived from a bio-based material, which conforms to the concept of green textiles. The production process of the present invention has strong stability and is suitable for the rapid production requirements of large quantities and multiple varieties. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the following examples, but the protection scope of the present invention is not limited thereto.

[0034] Unless otherwise specified, all raw materials used in the examples are commercially available, and processes not mentioned are conventional processes and are not described in detail.

[0035] The compound biological enzyme is used to produce RAYCLEAN SA-ALKⅠ for Zibo Lurui Fine Chemical Co., Ltd.

[0036] The biological penetrant was RAYCLEAN SA-PENⅡ produced by Zibo Lurui Fine Chemical Co., Ltd.;

[0037] The bio-based hydrophilic silicone oil softener was RUCOFIN GST575S produced by Rudolf Chemical (Nantong) Co., Ltd.

[0038] The activating enzyme auxiliary agent was DM-8656 produced by Guangdong Demei Fine Chemical Co., Ltd.;

[0039] The activated enzyme protective agent was DM-8657 produced by Guangdong Demei Fine Chemical Co., Ltd.;

[0040] The refining agent was DQ-1155 produced by Zibo Lurui Fine Chemical Co., Ltd.

[0041] The deoxygenase was EZB produced by Zibo Lurui Fine Chemical Co., Ltd.;

[0042] The chelating agent was SQ-B produced by Zibo Lurui Fine Chemical Co., Ltd.;

[0043] The modified aminopolysiloxane softener was GS-8816A produced by Hubei Furuite Technology Co., Ltd.

[0044] The degreasing agent was LFX produced by Qingdao Yuzhen Chemical Co., Ltd.

[0045] The neutralizing acid was PH-X produced by Zibo Lurui Fine Chemical Co., Ltd.;

[0046] The dyeing agent was XHT-S produced by Zibo Lurui Fine Chemical Co., Ltd.

[0047] The dispersing and leveling agent was LA-R produced by Zibo Lurui Fine Chemical Co., Ltd.;

[0048] The active leveling agent was LARLR produced by Zibo Lurui Fine Chemical Co., Ltd.

[0049] The anti-wrinkle agent in the bath was JES produced by Qingdao Ounuosi Industry and Trade Co., Ltd.

[0050] Sodium sulfate is NA2SO4 produced by Qingdao Yinrui Chemical Co., Ltd.

[0051] Soda ash is NA2CO3 produced by Zibo Taiqun Materials Co., Ltd.

[0052] Example 1

[0053] Raw material composition: 100% cotton;

[0054] Yarn count: 50 cotton;

[0055] Organization: cotton interlock;

[0056] Color: white;

[0057] The production process of the energy-saving and consumption-reducing green and environmentally friendly knitted fabric includes the following steps:

[0058] Raw material selection → scouring and bleaching pre-treatment, whitening bath → liquid ammonia → finishing and stenting → pre-shrinking;

[0059] The raw material selection process selects natural fiber 50-count organic fine-staple cotton.

[0060] The scouring and bleaching pre-treatment and whitening one-bath process is as follows:

[0061] (1) Put the fabric into the tank with 50℃ warm water, add 1g / L of biological penetrant, 0.3g / L of activated enzyme protective agent, and 0.5g / L of refining agent, and keep it for 3 minutes;

[0062] (2) After the composite bio-enzyme (7g / L) was dissolved in warm water, it was added at a constant speed (the water temperature was 50℃, stirred for 3 minutes, and then added at a constant speed within 5 minutes). The temperature was kept at 50℃ for 3 minutes, and 2g / L hydrogen peroxide and 1g / L activated enzyme were added. The temperature was raised to 75℃ at a constant speed and maintained for 35 minutes at a heating rate of 2.5℃ / min. After completion, the temperature was lowered to 50℃ at a constant speed and the water was drained at a cooling rate of 2℃ / min.

[0063] (3) After draining, refill water, add 1.4 g / L acetic acid, keep it for 3 minutes, then add 0.2 g / L deoxygenase, raise the temperature to 50°C, keep it for 30 minutes, then drain and complete the bleaching;

[0064] The whitening process and the scouring and bleaching pre-treatment process are carried out in one bath, and while adding the composite biological enzyme, 0.675% owf whitening agent is added at a uniform speed within 10 minutes and maintained for 3 minutes.

[0065] The vehicle speed in the liquid ammonia process is 40 m / min.

[0066] The finishing and stenting process has a speed of 20 m / min, a pressure of 25 bar, a drying room temperature of 135° C., and an overfeed of 20%.

[0067] Additives: RUCOFIN GST 575S: 30 g / L, neutralizing acid PH-X 3 g / L, the balance is water.

[0068] The pre-shrinking process speed is 20m / min, the temperature of the rubber blanket is 90°C, and the temperature of the felt blanket is 90°C.

[0069] Comparative Example 1

[0070] Raw material composition: 100% cotton;

[0071] Yarn count: 50 cotton;

[0072] Organization: cotton interlock;

[0073] Color: white;

[0074] Normal production process, including the following processes:

[0075] Raw material selection → alkali mercerizing → scouring and bleaching pre-treatment → whitening → finishing and stentering → pre-shrinking;

[0076] The raw material selection process selects natural fiber 50-count organic fine-staple cotton;

[0077] The alkali mercerizing process has a speed of 30 m / min, an alkali concentration of 26 Be, and a washing temperature of 60°C;

[0078] The scouring and bleaching pre-treatment process is as follows: the fabric is put into a vat with 50°C warm water, 1g / L of refining agent and 0.5g / L of chelating agent are added, and the mixture is kept for 3 minutes. Then, 5g / L of caustic soda is added at a uniform speed within 5 minutes for 5 minutes. After the mixture is kept for 12 minutes, 2g / L of hydrogen peroxide stabilizer is added, and 10g / L of hydrogen peroxide is added at a uniform speed for 5 minutes. After the addition is completed, the temperature is raised to 100°C and the mixture is kept for 60 minutes at a heating rate of 2.5°C / min. After the addition is completed, the temperature is uniformly lowered to 50°C and the water is drained at a cooling rate of 2°C / min.

[0079] After draining, refill with water, uniformly heat to 80℃ and hold for 15 minutes at a heating rate of 2.5℃ / min, uniformly cool to 60℃ and drain at a cooling rate of 2℃ / min, refill with water and add 1.4g / L acetic acid, hold for 3 minutes, then add 0.2g / L deoxygenase, heat to 50℃ and hold for 30 minutes before draining out of the tank;

[0080] The whitening process is as follows: adding 0.675% owf whitening agent at a constant speed within 10 minutes and maintaining it for 3 minutes;

[0081] The finishing stentering process has a speed of 20 m / min, a pressure of 25 bar, a drying room temperature of 135° C., an overfeed of 20%, and additives: 100 g / L of modified aminopolysiloxane softener, 4 g / L of neutralizing acid PH-X, and the balance being water.

[0082] The pre-shrinking process speed is 20m / min, the temperature of the rubber blanket is 90°C, and the temperature of the felt blanket is 90°C.

[0083] Example 2

[0084] Raw material composition: 36% cotton, 15% lyocell regenerated cellulose fiber, 49% sustainable recycled polyester;

[0085] Yarn count: 50 cotton regenerated cellulose fiber blended yarn, 100 denier sustainable recycled polyester (GRS certified);

[0086] Yarn arrangement: 1 cotton / regenerated cellulose, 1 polyester;

[0087] Organization: Sesame dots;

[0088] Color: yellow;

[0089] The production process of the low-carbon and environmentally friendly knitted fabric includes the following processes:

[0090] Raw material selection → scouring and bleaching pre-treatment → dyeing → liquid ammonia → finishing and stenting → pre-shrinking;

[0091] The raw materials are 50 Ne 70% cotton / 30% lyocell regenerated cellulose fiber blended yarn and recycled polyester 100D (compliant with GRS certification).

[0092] The scouring and bleaching pre-treatment process is as follows:

[0093] (1) Put the fabric into the tank with 55℃ warm water, add 1.5g / L of biological penetrant, 0.4g / L of activated enzyme protective agent, and 0.7g / L of refining agent, and keep it for 4 minutes;

[0094] (2) After the composite bio-enzyme (7.5 g / L) was dissolved in warm water, it was added at a constant speed (the water temperature was 55°C, stirring for 4 minutes, and the constant addition time was 5 minutes). The temperature was kept at 55°C for 4 minutes, and 2.5 g / L hydrogen peroxide and 1.5 g / L activated enzyme were added. The temperature was raised to 80°C at a constant speed and maintained for 40 minutes at a heating rate of 3°C / min. After completion, the temperature was lowered to 55°C at a constant speed and the water was drained at a cooling rate of 2.5°C / min.

[0095] (3) After draining, re-inject water, add 1.8 g / L of acetic acid, keep it for 4 minutes, then add 0.3 g / L of deoxygenase, raise the temperature to 55°C, keep it for 35 minutes, and then drain to complete the bleaching.

[0096] The dyeing process involves first dyeing and washing with disperse dyes, followed by reduction cleaning and then dyeing with reactive dyes. The disperse dyeing formula is 7% (owf) disperse dye, 1g / L dyeing agent, and 1.5g / L disperse leveling agent. The reactive dyeing formula is 8% (owf) reactive dye, 2g / L reactive leveling agent, 1.5g / L anti-wrinkle agent in the bath, and 80g / L sodium sulfate.

[0097] The liquid ammonia process speed is 45m / min.

[0098] The finishing stentering process was conducted at a speed of 25 m / min, a pressure of 30 bar, a drying room temperature of 145° C., and an overfeed of 23%. Additives included 40 g / L of RUCOFIN GST 575S, 4 g / L of neutralizing acid PH-X, and the balance was water.

[0099] The pre-shrinking process speed is 30m / min, the temperature of the rubber blanket is 100℃, and the temperature of the felt blanket is 100℃.

[0100] Comparative Example 2

[0101] Raw material composition: 36% cotton, 15% lyocell regenerated cellulose fiber, 49% sustainable recycled polyester;

[0102] Yarn count: 50 cotton / regenerated cellulose blended yarn, 100 denier sustainable recycled polyester (GRS certified);

[0103] Yarn arrangement: 1 cotton / regenerated cellulose, 1 polyester;

[0104] Organization: Sesame dots;

[0105] Color: yellow;

[0106] The production process of the low-carbon and environmentally friendly knitted fabric includes the following processes:

[0107] Raw material selection → alkali mercerizing → scouring and bleaching pre-treatment → dyeing → finishing and stentering → pre-shrinking;

[0108] The raw materials are 50 Ne 70% cotton / 30% lyocell regenerated cellulose fiber blended yarn and recycled polyester 100D (compliant with GRS certification).

[0109] The scouring and bleaching pre-treatment process comprises the following steps: adding 50° C. warm water into a vat, adding 1 g / L of a refining agent, 0.5 g / L of a chelating agent, and 3 g / L of a degreasing agent, maintaining the temperature for 3 minutes, then uniformly adding 5 g / L of caustic soda within 5 minutes, maintaining the temperature for 12 minutes, adding 2 g / L of a hydrogen peroxide stabilizer, and uniformly adding 10 g / L of hydrogen peroxide within 5 minutes. After the addition is completed, the temperature is raised to 100° C. and maintained for 60 minutes at a heating rate of 2.5° C. / min. After the addition is completed, the temperature is uniformly lowered to 50° C. and then drained at a cooling rate of 2° C. / min.

[0110] After draining, re-inject water, uniformly heat to 80℃ and hold for 15 minutes, with a heating rate of 2.5℃ / min, uniformly cool to 60℃ and drain at a cooling rate of 2℃ / min, re-inject water and add 1.4g / L acetic acid, hold for 3 minutes, then add 0.2g / L deoxygenase, heat to 50℃ and hold for 30 minutes before draining out of the tank.

[0111] Dyeing begins with disperse dyeing and washing, followed by reduction cleaning before reactive dyeing. The disperse dyeing formula is 7% owf disperse dye, 1g / L dyeing agent, and 1.5g / L disperse leveling agent. The reactive dyeing formula is 8% owf reactive dye, 2g / L reactive leveling agent, 1.5g / L anti-wrinkle agent in the bath, and 80g / L sodium sulfate.

[0112] The finishing and stenting process has a speed of 25 m / min, a pressure of 30 bar, a drying room temperature of 145° C., and an overfeed of 23%.

[0113] Additives: modified aminopolysiloxane softener 100g / L, neutralizing acid PH-X 4g / L, the balance is water.

[0114] The pre-shrinking process speed is 30m / min, the temperature of the rubber blanket is 100℃, and the temperature of the felt blanket is 100℃.

[0115] Example 3

[0116] Raw material composition: 45.5% cotton, 19.5% regenerated cellulose fiber, 35% SORONA (37% bio-based source);

[0117] Yarn count: Ne 60 cotton / regenerated cellulose blend, 50D SORONA (37% bio-based);

[0118] Yarn arrangement: 1 cotton / regenerated cellulose, 1 SORONA;

[0119] Organization: jersey;

[0120] Color: navy blue;

[0121] The production process of the energy-saving and consumption-reducing green and environmentally friendly knitted fabric includes the following processes:

[0122] Raw material selection → washing → scouring and bleaching pre-treatment → dyeing → liquid ammonia → finishing and stenting → pre-shrinking;

[0123] The raw materials are 60 Ne 70% cotton / 30% regenerated cellulose fiber blended yarn and 50 denier bio-based two-component composite stretch polyester SORONA (37% bio-based source).

[0124] The water washing process speed is 30m / min, the degreasing agent content is 2g / L, and the open-width water washing box temperature is 30℃, 30℃, 80℃, 80℃, and 60℃.

[0125] The scouring and bleaching pre-treatment process is as follows:

[0126] (1) Put the fabric into the tank with 60℃ warm water, add 2g / L of high-efficiency biological penetrant, 0.5g / L of activated enzyme protective agent, and 1g / L of refining agent, and keep it for 5 minutes;

[0127] (2) After the composite bio-enzyme (8g / L) was dissolved in warm water, it was added at a constant speed (the water temperature was 60°C, stirring for 5 minutes, and the constant addition time was 6 minutes). The temperature was kept at 60°C in warm water for 5 minutes. 3g / L hydrogen peroxide and 1.5g / L activated enzyme were added. The temperature was raised to 80°C at a constant speed and maintained for 40 minutes at a heating rate of 3°C / min. After completion, the temperature was lowered to 60°C at a constant speed and the water was drained at a cooling rate of 2.5°C / min.

[0128] (3) After draining, refill water, add 2 g / L acetic acid, keep it for 5 minutes, then add 0.4 g / L deoxygenase, raise the temperature to 55 °C, keep it for 35 minutes, then drain and complete the bleaching;

[0129] The dyeing process involves first dyeing and washing with disperse dyes, followed by reduction cleaning and then dyeing with reactive dyes. The disperse dyeing formula is 7% (owf) disperse dye, 1g / L dyeing agent, and 1.5g / L disperse leveling agent. The reactive dyeing formula is 8% (owf) reactive dye, 2g / L reactive leveling agent, 1.5g / L anti-wrinkle agent in the bath, and 80g / L sodium sulfate.

[0130] The liquid ammonia process speed is 50m / min.

[0131] The finishing tentering process was conducted at a speed of 30 m / min, a pressure of 35 bar, a drying room temperature of 145° C., and an overfeed of 10%. Additives included 40 g / L of RUCOFIN GST 575S, 5 g / L of neutralizing acid PH-X, and the balance was water.

[0132] The pre-shrinking process speed is 30m / min, the temperature of the rubber blanket is 100℃, and the temperature of the felt blanket is 100℃.

[0133] Comparative Example 3

[0134] Raw material composition: 45.5% cotton, 19.5% regenerated cellulose fiber, 35% SORONA (37% bio-based source);

[0135] Yarn count: Ne 60 cotton / regenerated cellulose blend, 50D SORONA (37% bio-based);

[0136] Yarn arrangement: 1 cotton / regenerated cellulose, 1 SORONA;

[0137] Organization: jersey;

[0138] Color: navy blue;

[0139] The production process of the energy-saving and consumption-reducing green and environmentally friendly knitted fabric includes the following processes:

[0140] Raw material selection → washing → alkali mercerizing → scouring and bleaching pre-treatment → dyeing → finishing and stentering → pre-shrinking;

[0141] The raw materials are 60 Ne 70% cotton / 30% regenerated cellulose fiber blended yarn and 50 denier bio-based two-component composite stretch polyester SORONA (37% bio-based source).

[0142] The water washing process speed is 30m / min, the degreasing agent content is 2g / L, and the open-width water washing box temperature is 30℃, 30℃, 80℃, 80℃, and 60℃.

[0143] The scouring and bleaching pre-treatment process comprises the following steps: adding 50° C. warm water into a vat, adding 1 g / L of a refining agent, 0.5 g / L of a chelating agent, and 3 g / L of a degreasing agent, uniformly adding 5 g / L of caustic soda within 5 minutes, maintaining the temperature for 12 minutes, adding 2 g / L of a hydrogen peroxide stabilizer, uniformly adding 10 g / L of hydrogen peroxide within 5 minutes, and maintaining the temperature for 5 minutes. After the addition is completed, the temperature is raised to 100° C. and maintained for 60 minutes at a heating rate of 2.5° C. / min. After the addition is completed, the temperature is uniformly lowered to 50° C. and then drained at a cooling rate of 2° C. / min.

[0144] After draining, re-inject water, uniformly heat to 80℃ and hold for 15 minutes, with a heating rate of 2.5℃ / min, uniformly cool to 60℃ and drain at a cooling rate of 2℃ / min, re-inject water and add 1.4g / L acetic acid, hold for 3 minutes, then add 0.2g / L deoxygenase, heat to 50℃ and hold for 30 minutes before draining out of the tank.

[0145] The dyeing process is a conventional cotton and polyester dyeing process. Disperse dyeing and washing are performed first, followed by reduction cleaning, and then reactive dyeing. The disperse dyeing formula is 7% (owf) disperse dye, 1g / L dyeing agent, and 1.5g / L disperse leveling agent. The reactive dyeing formula is 8% (owf) reactive dye, 2g / L reactive leveling agent, 1.5g / L anti-wrinkle agent in the bath, and 80g / L sodium sulfate.

[0146] The finishing stentering process was conducted at a speed of 30 m / min, a pressure of 35 bar, a drying room temperature of 145° C., and an overfeed of 10%. Additives included 100 g / L of modified aminopolysiloxane softener, 5 g / L of neutralizing acid PH-X, and the balance was water.

[0147] The pre-shrinking process speed is 30m / min, the temperature of the rubber blanket is 100℃, and the temperature of the felt blanket is 100℃.

[0148] The fabrics obtained in the examples and comparative examples were subjected to performance tests, and the test standards were as follows:

[0149] Bursting strength GB / T 19976-2005 method;

[0150] Pilling GB / T 4802.1-2008E method;

[0151] Snagging GB / T 11047-2008;

[0152] Distortion after washing GB / T 23319.2-2009 method;

[0153] Color fastness to rubbing GB / T 3920-2008 method;

[0154] Water absorption AATCC 79-2010e2(2018)e method;

[0155] Formaldehyde GB / T 2912.1-2009 method;

[0156] Odor GB 18401-2010 / 6.7 method.

[0157] The test results are shown in Table 1.

[0158] Table 1 Fabric test data obtained from Examples and Comparative Examples

[0159]

[0160]

[0161] Comparing the chemicals and quality produced in the above examples and comparative examples, it was found that:

[0162] For the same fabric, taking 1 ton of fabric as an example, the caustic soda consumption in the scouring and bleaching process of Comparative Example 1 is 30 kg, and the H2O2 consumption is 60 kg. The hot water washing process takes our overflow dye vat as an example, with a capacity of 1.4 tons, a bath ratio of 1:6, and a water consumption of 6000 L per ton. After the improved process is implemented in Example 1, no caustic soda is used in the scouring and bleaching process, and the H2O2 consumption is 12 kg, and no hot water washing is required;

[0163] After comparing the white fabric processes, it can be found that the whiteness of the embodiment is significantly better than that of the traditional process, and the consumption of caustic soda can be reduced by 60 kg per ton, the amount of H2O2 can be reduced by 48 kg, 6000 L of water can be saved, and the scouring and bleaching process time can be shortened by 15 minutes.

[0164] During the finishing process, the example uses 40 g / L of bio-based softener instead of ordinary silicone softener, of which 25% of the bio-based ingredients replace the original petroleum-based emulsifier. Under this process, the amount of petrochemical products used can be reduced by 2.5 kg for every ton of fabric produced.

[0165] By comparing the intrinsic indicators such as physical properties of the three embodiments and the comparative examples, it was found that the bursting strength, pilling, snagging, distortion after washing, color fastness to friction and water absorption of the embodiments were significantly better than those of the traditional process, and the formaldehyde content and odor indicators were both qualified. The fabrics bleached and boiled using the embodiments felt softer, more skin-friendly, more durable and wear-resistant, and had long-lasting color and were easy to care for.

[0166] The above describes specific implementation cases of the present invention. Process replacements and simple modifications made without departing from the core content and scope of this patent should be covered within the scope of the present invention.

Claims

1. A method for preparing an energy-saving, consumption-reducing, green and environmentally friendly knitted fabric, characterized in that: The process includes the following steps: Raw material selection → scouring and bleaching pre-treatment → dyeing → liquid ammonia → finishing and stenting → pre-shrinking; Or, raw material selection → scouring and bleaching pre-treatment, whitening bath → liquid ammonia → finishing and stentering → pre-shrinking; Or, raw material selection → washing → scouring and bleaching pre-treatment → dyeing → liquid ammonia → finishing and stenting → pre-shrinking; The raw material selection is as follows: the raw materials are natural fibers, renewable and degradable regenerated cellulose or recycled chemical fibers; The scouring and bleaching pre-treatment comprises the following steps: using a composite biological enzyme, a biological penetrant, an activated enzyme, an activated enzyme protective agent, a refining agent and hydrogen peroxide for treatment, and then acid washing after drainage.

2. The method for preparing an energy-saving, consumption-reducing, green and environmentally friendly knitted fabric according to claim 1, characterized in that: The raw materials include one or more of pure cotton, cotton / regenerated cellulose fiber, regenerated polyester, and bio-based two-component composite elastic polyester SORONA.

3. The method for preparing an energy-saving, consumption-reducing, green and environmentally friendly knitted fabric according to claim 1, characterized in that: The scouring and bleaching pre-treatment process is as follows: (1) Put the fabric into the tank with warm water at 50℃~60℃, add 1~2g / L of biological penetrant, 0.3~0.5g / L of activated enzyme protective agent, and 0.5~1g / L of refining agent, and keep it for 3~5 minutes; (2) Add 7-8 g / L of compound biological enzyme after warm water dissolution, keep it for 3-5 minutes, add 2-3 g / L of hydrogen peroxide, 1-1.5 g / L of activated enzyme, raise the temperature to 75-80 ° C and keep it for 35-40 minutes, cool it to 50-60 ° C and drain it; (3) After draining, re-inject water, add 1.4-2 g / L of acetic acid, keep it for 3-5 minutes, then add 0.2-0.4 g / L of deoxygenase, raise the temperature to 50-55°C, keep it for 30-35 minutes, then drain and complete the bleaching.

4. The method for preparing an energy-saving, consumption-reducing, green and environmentally friendly knitted fabric according to claim 3, characterized in that: The composite biological enzyme is SA-ALK, and the biological permeant is SA-PEN.

5. The method for preparing an energy-saving, consumption-reducing, green and environmentally friendly knitted fabric according to claim 3, characterized in that: The warm water material is as follows: the composite biological enzyme powder is put into warm water at 50-60° C. and stirred for 3-5 minutes.

6. The method for preparing an energy-saving, consumption-reducing, green and environmentally friendly knitted fabric according to claim 3, characterized in that: After the warm water is added to the material, the composite biological enzyme is added at a uniform speed within 5 to 6 minutes.

7. The method for preparing an energy-saving, consumption-reducing, green and environmentally friendly knitted fabric according to claim 3, characterized in that: The heating rate of step (2) is 2.5-3°C / min.

8. The method for preparing an energy-saving, consumption-reducing, green and environmentally friendly knitted fabric according to claim 3, characterized in that: The cooling rate of step (2) is 2 to 2.5°C / min.

9. The method for preparing an energy-saving, consumption-reducing, green and environmentally friendly knitted fabric according to claim 1, characterized in that: In the finishing and stentering process, a bio-based hydrophilic silicone oil softener is added to perform softening treatment.

10. The method for preparing energy-saving, consumption-reducing, green and environmentally friendly knitted fabric according to claim 9, characterized in that: The bio-based hydrophilic silicone oil softener is GST 575S, dosage is 30-40g / L.

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