CN1417403A - Pre-treatment process of cotton or cotton/polyester fabric before continuous dipping of bioenzyme and steaming - Google Patents

Abstract

The invention discloses a bio-enzyme continuous padding-steaming pretreatment process for cotton or polyester/cotton knitted fabrics, belonging to the technical field of knitted fabric pretreatment processes in the printing and dyeing industry. It is necessary to solve the technical problem of poor treatment effect of the traditional method of boiling first and then bleaching in the biological enzyme pretreatment process of cotton fabric, and achieve the purpose of optimizing the treatment effect. The continuous biological enzyme padding-steaming pretreatment process of cotton or polyester/cotton knitted fabrics is used. The knitted fabric is first subjected to oxidation pretreatment of padding hydrogen peroxide and steaming, washed with water, and then subjected to padding biological enzymes and steaming. Biological enzyme treatment, enzyme elimination, water washing, and complete the pretreatment of knitted fabrics. It has the characteristics of good pretreatment effect, less damage to fibers, high quality of treated fabrics, soft hand feeling, chroma, pH value and COD value of treated wastewater are far lower than traditional processes, which reduces the burden of sewage treatment and is beneficial to the ecological environment It also has the characteristics of high production efficiency, low labor intensity, energy saving and water saving.

Description

A biological enzyme continuous padding-steaming pretreatment process for cotton or polyester/cotton knitted fabrics

technical field

The invention relates to a biological enzyme continuous padding-steaming pretreatment process of all cotton or polyester/cotton knitted fabrics, belonging to the technical field of knitted fabric pretreatment processes in the printing and dyeing industry.

Background technique

Cotton fiber contains 0.4-1.2% pectin, 0.4-1.2% wax, 1.0-1.9% protein, 0.7-1.6% ash and other natural impurities or companions, these impurities mainly exist in the cotton fiber In the stratum corneum and primary cell wall. The existence of these impurities seriously affects the wettability of cotton fiber, makes cotton fiber hydrophobic, and affects the properties of cotton fiber such as dyeing and finishing. Therefore, the first step in the dyeing and finishing of cotton textile products is to carry out pretreatment to remove natural impurities on cotton fibers, improve the wetting and permeability of cotton fabrics, and create good conditions for subsequent dyeing and finishing.

At present, the pretreatment of cotton or polyester/cotton knitted fabrics mainly adopts caustic soda and surfactant scouring and then bleaching. Caustic soda is used to decompose pectin and protein and saponify and surface fatty acid esters in wax. The active agent can emulsify and disperse higher fatty alcohols, higher fatty acids and hydrocarbons in wax to remove impurities such as hydrophobic substances on cotton fibers and improve wetting performance. This process has a better pretreatment effect, but there are many problems at the same time. This treatment method has a high removal rate of cotton wax, reaching more than 70%, which affects the feel of cotton knitted fabrics; in addition, due to the treatment under high temperature and strong alkali conditions, the damage to cotton fibers is relatively large; more seriously, strong The wastewater from alkali scouring has high chroma, strong alkalinity, pH value above 12, and COD value above 10000ppm, seriously polluting the ecological environment.

Although the cotton knitting industry is also gradually adopting the one-bath method of alkali-oxygen boiling and bleaching, the above-mentioned problems still exist because the amount of alkali used is still high.

In addition, at present, the pretreatment of cotton knitted fabrics mainly adopts the batch method of processing in the overflow dyeing machine. This method also has long processing time, low production efficiency, high labor intensity, large water consumption and large steam consumption, etc. question.

The biological enzyme pretreatment of cotton fabric is basically treated under near-neutral conditions due to the high specificity, high efficiency and mild treatment conditions of biological enzymes, so the damage to the fiber is small, and the chroma of the treated wastewater is low , the pH value is nearly neutral, and the COD value is significantly reduced, only 1/2 to 1/3 of the original value, which significantly reduces environmental pollution and has great social and economic value.

Although the biological enzyme pretreatment of cotton fabric has been studied for many years, the traditional process of scouring first and then bleaching is still used, so the treatment effect is not good, and the hydrophobic substances cannot be removed fundamentally. In the case of excluding the false capillary effect of the surfactant, the process of scouring with bio-enzyme and then bleaching is adopted, and the capillary effect is 0 (cm/30min).

Contents of the invention

(1) Technical problems to be solved

A biological enzyme continuous padding-steaming pretreatment process for all cotton or polyester/cotton knitted fabrics, to solve the technical problem of poor treatment effect of the traditional scouring and then bleaching process used in the pretreatment process of knitted fabrics , to achieve the purpose of optimizing the processing effect.

(2) Technical solution

A biological enzyme continuous padding-steaming pretreatment process for all cotton or polyester/cotton knitted fabrics. , and then through the processes of padding biological enzymes, steaming biological enzymes, enzyme inactivation, and water washing to complete the pretreatment of knitted fabrics.

100% cotton or polyester/cotton knitted gray fabric: This process is suitable for 100% cotton or polyester/cotton knitted gray fabric, such as cotton fleece, single jersey, and T-shirt fabrics.

Oxidation pretreatment, including padding hydrogen peroxide pretreatment solution, steaming: this process plays an important role in ensuring the effect of biological enzyme pretreatment. Without hydrogen peroxide oxidation pretreatment or hydrogen peroxide oxidation pretreatment is too light will affect the treatment effect of biological enzymes.

Padding hydrogen peroxide pretreatment solution: the composition of hydrogen peroxide pretreatment solution is 30% hydrogen peroxide 10-80g/L, sodium silicate 10-60g/L, pH 5-13, liquid-carrying rate 50%-120%, non-ionic surface Active agent or anionic surfactant wetting and penetrating agent 0~15g/L.

Steaming: Steaming is an important means to achieve the pretreatment effect of hydrogen peroxide, and the steaming condition is too light will affect the pretreatment effect. Generally speaking, the higher the steaming temperature, the shorter the time, and the lower the steaming temperature, the longer the time. The steaming conditions adopted in the present invention are: steaming temperature 50-120° C., steaming time 20-120 min.

Water washing: Since biological enzyme treatment has certain requirements on pH, and the pH after oxidation pretreatment does not necessarily meet the requirements of subsequent biological enzyme treatment, sufficient water washing is required after hydrogen peroxide oxidation pretreatment.

Biological enzyme treatment, including padding enzyme treatment solution and steaming: it is the key to ensure the treatment effect, and the type of enzyme and treatment conditions need to be carefully selected. The enzyme selected in the present invention is acid pectinase, alkaline pectinase or neutral cellulase, acid cellulase, or a combination of pectinase and/or cellulase.

Padding enzyme treatment solution: the composition of the enzyme treatment solution is: pectinase 0~5.5g/L, cellulase 0~8.0g/L, nonionic surfactant or anionic surfactant wetting, penetrating agent 0~ 20g/L, pH7.0～9.8, liquid carrying rate 50%～120%.

Steaming: steaming is also an important factor affecting the effect of enzyme treatment. If the steaming temperature is too high, although the enzyme treatment speed is faster, it will affect the activity of the enzyme. If the steaming temperature is too low, although the activity of the enzyme will be lost less, it will also will affect the processing effect. The steaming temperature adopted in the present invention is 30-70° C., and the steaming time is 20-120 minutes.

Enzyme inactivation: Cellulase may be used in enzyme treatment, and cellulase will hydrolyze cellulose and damage fibers, so enzyme inactivation treatment is required. Enzyme inactivation can be done by raising the pH value or raising the temperature to 75-85°C for 10-20 minutes.

Water washing: After inactivating the enzyme, it should be fully washed with water.

In hydrogen peroxide padding pretreatment and biological enzyme padding enzyme treatment, polyoxyethylene type nonionic surfactants and anionic surfactants can be added as wetting and penetrating agents, or no wetting and penetrating agents can be added.

(3) Beneficial effect

The present invention is different from the traditional technological process, but adopts the oxidation pretreatment of padding hydrogen peroxide and steaming first, and then a new pretreatment process of padding biological enzymes and steaming, and adopts pectinase or pectinase in the biological enzyme treatment. Cellulase or a combination of both. The cotton knitted fabric bio-enzyme pretreatment process of the invention has the characteristics of good pretreatment effect. Without adding any surfactant, the capillary effect after drying at 105°C is above 7.0cm/min. In addition, the process of the present invention has little damage to fibers, the quality of the treated fabric is high, and the handle is soft. Especially, the chroma, pH value, and COD value of the waste water treated by the process of the present invention are far lower than the traditional process, which is very beneficial to the protection of the ecological environment. It also greatly reduces the burden of sewage treatment. Moreover, the present invention has the characteristics of high production efficiency, low labor intensity, energy saving and water saving due to the continuous treatment process of padding and steaming.

Detailed ways

Embodiment 1: 2000 g of cotton wool knitted cloth.

The composition of the hydrogen peroxide pretreatment solution: 30% hydrogen peroxide 50g/L, sodium silicate 40g/L, pH 11-12. Pad hydrogen peroxide pretreatment solution, with a liquid retention rate of 100%, and steam at 98°C for 60 minutes. Fully wash with water after oxidation pretreatment.

The composition of the biological enzyme treatment solution: alkaline pectinase 1.5g/L, neutral cellulase 1.5g/L, pH8.5, padding biological enzyme treatment solution, liquid entrainment rate 100%, steaming temperature 65°C, steaming Steaming time 60min. After treatment, heat up to 75-85°C for 10-20 minutes to inactivate enzymes, wash thoroughly with water, and dry or dry at room temperature.

After the above treatment, the capillary effect of the knitted fabric after drying at room temperature reaches 13.0cm/30min, and the water drop absorption time is less than 1 second. After drying at 105℃, the capillary effect reaches 7.5cm/30min, the water drop absorption time is less than 1 second, and the whiteness is above 80.

Embodiment 2: 2000 g of cotton wool knitted cloth.

The composition of the hydrogen peroxide pretreatment solution: 30% hydrogen peroxide 50g/L, sodium silicate 40g/L, pH 11-12. Pad hydrogen peroxide pretreatment solution, with a liquid retention rate of 100%, and steam at 98°C for 60 minutes. Fully wash with water after oxidation pretreatment.

The composition of the biological enzyme treatment solution: alkaline pectinase 2.0g/L, neutral cellulase 0g/L, pH8.5, padding biological enzyme treatment solution, liquid retention rate 100%, steaming temperature 65°C, steaming The time is 60 minutes. After treatment, heat up to 75-85°C for 10-20 minutes to inactivate enzymes, wash thoroughly with water, and dry or dry at room temperature.

After the above treatment, the capillary effect of the knitted fabric after drying at room temperature reaches 15.0cm/30min, and the water drop absorption time is less than 1 second. After drying at 105°C, the capillary effect reaches 8.0cm/30min, the water drop absorption time is less than 1 second, and the whiteness is above 80.

Embodiment 3: 2000 g of cotton wool knitted cloth.

Composition of hydrogen peroxide pretreatment solution: 30% hydrogen peroxide 50g/L, sodium silicate 40g/L, nonionic or anionic wetting and penetrating agent JFC10g/L, pH11～12. Pad hydrogen peroxide pretreatment solution, with a liquid retention rate of 100%, and steam at 98°C for 60 minutes. Fully wash with water after oxidation pretreatment.

The composition of biological enzyme treatment solution: alkaline pectinase 1.5g/L, neutral cellulase 0.5g/L, non-ionic or anionic wetting and penetrating agent JFC 5g/L, pH8.5, padding biological enzyme treatment solution , the liquid carrying rate is 100%, the steaming temperature is 65°C, and the steaming time is 60min. After treatment, heat up to 75-85°C for 10-20 minutes to inactivate enzymes, wash thoroughly with water, and dry or dry at room temperature.

After the above treatment, the capillary effect of the knitted fabric after drying at room temperature reaches 16.0cm/30min, and the water drop absorption time is less than 1 second. After drying at 105℃, the capillary effect reaches 12.0cm/30min, the water drop absorption time is less than 1 second, and the whiteness is above 80.

Claims (4)

1. A biological enzyme pretreatment process for all cotton or polyester/cotton knitted fabrics, characterized in that it adopts continuous padding-steaming pretreatment process, and the process flow is that all cotton or polyester/cotton knitted fabrics are first subjected to padding hydrogen peroxide, Oxidation pretreatment of steaming, washing with water, then padding with biological enzymes, steaming with biological enzymes, deactivation of enzymes, and washing with water to complete the pretreatment of knitted fabrics; Oxidation pretreatment: including two procedures of padding hydrogen peroxide pretreatment solution and steaming; the composition of hydrogen peroxide pretreatment solution is: 30% hydrogen peroxide 10-80g/l, sodium silicate 10-60g/l, non-ionic surfactant Or anionic surfactant wetting and penetrating agent 0~15g/l; padding requirements: pH5~13, liquid carrying rate 50%~120%; steaming conditions: temperature 50~120℃, time 20~120min; Washing: fully washed with water after hydrogen peroxide oxidation pretreatment; Biological enzyme treatment: including two procedures of padding enzyme treatment solution and steaming; the composition of enzyme treatment solution is: pectinase 0-5.5g/l, cellulase 0-8.0g/l, non-ionic surfactant or Anionic surfactant wetting and penetrating agent 0~20g/l; padding requirements: pH7.0~9.8, liquid carrying rate 50%~120%; steaming conditions: temperature 30~70℃, time 20~120min ; Enzyme inactivation: increase the pH value, or increase the temperature to 75-85°C, and treat for 10-20 minutes; Water washing: After inactivating the enzyme, it should be fully washed with water. 2. A biological enzyme pretreatment process for all cotton or polyester/cotton knitted fabrics according to claim 1, characterized in that all cotton or polyester/cotton knitted fabrics suitable for treatment include cotton wool fabrics, single jersey, flannelette, T shirt fabric. 3. A biological enzyme pretreatment process for cotton or polyester/cotton knitted fabrics according to claim 1, characterized in that the enzymes selected in the enzyme treatment solution are alkaline pectinase, acid pectinase, neutral fiber Sulfase, acid cellulase, or combinations thereof. 4. A biological enzyme pretreatment process for cotton or polyester/cotton knitted fabrics according to claim 1, characterized in that in the hydrogen peroxide padding pretreatment and biological enzyme padding enzyme treatment, polyoxyethylene non-ionic Surfactants and anionic surfactants can be used as wetting and penetrating agents, or no wetting and penetrating agents can be added.