A singeing-free deboiling composite enzyme preparation and a pretreatment method for cotton woven fabrics

Abstract

The present invention discloses a singeing-free descaling composite enzyme preparation, characterized in that, by weight percentage, it includes 10-14% amylase, 30-35% alkaline pectinase, 8-10% alkaline cellulase, 14-18% alkaline xylanase, 4-5% enzyme compounding agent, 1-2% anhydrous sodium carbonate, 7-11% chelating dispersant and 8-10% wetting penetrant. The present invention also discloses a pre-treatment method for cotton woven fabrics. The singeing-free descaling composite enzyme preparation of the present invention is applied to the padding and steaming pre-treatment of cotton woven fabrics, and a surface-engraved square roller and an ultrasonic generator are set in a washing box. Through the action of the composite enzyme preparation, impurities such as starch and pectin are decomposed, exposing more cellulose, reducing the connection between hairiness and the cloth surface, and removing the hairiness by strong water washing, significantly reducing the hairiness on the fabric surface. At the same time, under the synergistic effect of the composite enzyme and the auxiliary agent, the treated cotton woven fabric has a higher pectin removal rate and lower strength loss.

Description

Technical Field

[0001] The invention relates to the field of cotton textile pretreatment, in particular to a singeing-free deboiling composite enzyme preparation and a cotton woven fabric pretreatment method. Background Art

[0002] Cotton woven fabrics are soft, smooth, elastic, breathable, and have a smooth, pleasant hand. They are widely used in a variety of clothing and home textiles. However, due to the presence of large amounts of impurities such as sizing, pectin, and wax on the surface, cotton greige fabrics require pretreatment to remove these impurities before dyeing and finishing. Typical pretreatment steps include singeing, desizing, scouring, and bleaching. This entire pretreatment process often involves high temperatures and strong alkalis, generating large amounts of alkaline wastewater and impacting the natural environment. Energy conservation, consumption reduction, and environmental pollution reduction are pressing challenges in cotton woven fabric processing and the textile industry as a whole.

[0003] Bioenzymes, as green catalysts, have attracted significant attention in the textile industry. By catalyzing the decomposition of impurities such as starch, pectin, oil, wax, and protein on the surface of cotton fibers, various enzymes can remove impurities from cotton fabrics, improve their wettability, and reduce environmental pollution. Currently, enzymatic pretreatment of cotton woven fabrics primarily targets the desizing and scouring steps, using a pad-steaming process. While this method can significantly reduce pollution and energy consumption associated with pretreatment, the enzymes operate at relatively low temperatures, resulting in poor removal of cotton wax and a lower improvement in fabric wettability. Overall, the treatment is inferior to traditional alkaline pretreatment. Furthermore, friction during spinning, doubling, and weaving exposes many short, loose fibers to the yarn surface, creating a layer of short fibers. This layer not only affects the fabric's finish but also attracts dust during production and can cause various defects during printing and dyeing. Because cotton fabrics have varying lengths of fine hair on their surface, singeing is often a pre-treatment step. This involves using a high-temperature flame to rapidly remove the hairiness. This process involves high temperatures, high energy consumption, and requires meticulous control. Under- and over-singing can easily result in incomplete hair removal, leading to defects in the fabric, while over-singing can cause problems such as shrinkage. Furthermore, singeing prior to desizing can also create two issues: first, greige fabrics made from medium- and high-count yarns often have a higher sizing load, which can easily cover the hairiness with the sizing film, leading to re-exposure after desizing. Second, singeing, as a heat treatment, can crystallize the polymers in the sizing film, making it harder and less soluble and biodegradable, resulting in poor desizing results. Placing singeing after desizing also presents challenges with wet processing and incompatible equipment at existing printing and dyeing facilities. Consequently, the impact of singeing on desizing has long plagued printing and dyeing companies. Summary of the Invention

[0004] In response to the above-mentioned problems, the purpose of the present invention is to provide a composite enzyme preparation for the singeing-free deboiling of cotton woven fabrics. The composite enzyme preparation is applied to the pretreatment process of cotton woven fabrics to achieve the purpose of reducing energy consumption and simplifying the process. Through the action of the composite enzyme preparation, impurities such as starch and pectin are decomposed, more cellulose is exposed, the connection between the hairiness and the fabric surface is reduced, and the hairiness is removed by strong water washing, thereby significantly reducing the hairiness on the fabric surface and realizing deboiling treatment without singeing.

[0005] In view of the above-mentioned purpose, the present invention provides a singeing-free and deboiling composite enzyme preparation, which comprises, by weight percentage, 10-14% of amylase, 30-35% of alkaline pectinase, 8-10% of alkaline cellulase, 14-18% of alkaline xylanase, 4-5% of enzyme compounding agent, 1-2% of alkaline pH regulator, 7-11% of chelating dispersant and 8-10% of penetrating emulsifier, wherein the enzyme compounding agent comprises at least one of 1,3-propylene glycol, sorbitol, pentaerythritol and xylitol.

[0006] The specific activity of the amylase is 6000-8000 U / g, the specific activity of the alkaline pectinase is 150-300 U / g, the specific activity of the alkaline cellulase is 60-120 U / g, and the specific activity of the alkaline xylanase is 100-200 U / g.

[0007] The alkaline xylanase used in the present invention is preferably a super-thermostable alkaline xylanase, that is, a xylanase that can withstand a high temperature of up to 80° C. and a pH of up to 9.5.

[0008] In one embodiment of the present invention, the alkaline cellulase is endoglucanase.

[0009] In one embodiment of the present invention, the chelating dispersant includes at least one organic acid complex selected from triethylhexyl phosphate, sodium lauryl sulfate, fatty acid polyethylene glycol esters, and the like.

[0010] In one embodiment of the present invention, the penetrating emulsifier includes fatty alcohol polyoxyethylene ether and / or alkylphenol polyoxyethylene ether.

[0011] In one embodiment of the present invention, the alkaline pH adjuster includes at least one of sodium carbonate, sodium bicarbonate, and disodium hydrogen phosphate.

[0012] The present invention also provides a method for pre-treating cotton woven fabrics using the composite enzyme preparation, comprising the following steps:

[0013] (1) Pretreatment: padding the cotton woven fabric with a pretreatment working solution comprising a penetrating emulsifier, a raising agent, and urea;

[0014] (2) Padding: Padding the cotton woven fabric pretreated in step (1) using a working solution of a singeing-free deboiling complex enzyme preparation;

[0015] (3) steaming: placing the cotton woven fabric after the padding treatment in step (2) in a steaming device for high-temperature steaming;

[0016] (4) Washing and drying: The cotton woven fabric after steaming in step (3) is ultrasonically washed and then put into drum drying.

[0017] In one embodiment of the present invention, in the pretreatment working solution of step (1), the concentrations of the penetrating emulsifier, the raising agent and the urea are 1-2 g / L, 1-3 g / L and 3-5 g / L respectively.

[0018] In one embodiment of the present invention, during the padding pretreatment in step (1), the fabric passes through two sets of square rollers with grooved surfaces, and the square rollers are located below the liquid surface.

[0019] In one embodiment of the present invention, in step (1), one dipping and one rolling are adopted, the rolling rate is 80-90%, and the rolling liquid temperature is 90-100°C.

[0020] In one embodiment of the present invention, the concentration of the singeing-free and deboiling complex enzyme preparation in the working solution of the singeing-free and deboiling complex enzyme preparation in step (2) is 18-24 g / L.

[0021] In one embodiment of the present invention, in step (2), two dipping and two rolling are adopted, the rolling rate is 90% to 110%, and the rolling liquid temperature is 40 to 60°C.

[0022] In one embodiment of the present invention, the steaming temperature in step (3) is 70-90° C., and the steaming time is 40-60 min.

[0023] In one embodiment of the present invention, the specific steps of washing in step (4) are as follows: a washing device is provided with two washing tanks, wherein a square roller with a surface pattern is provided below the liquid surface of the first washing tank and an ultrasonic generator is provided. When the steamed cotton woven fabric passes through the first washing tank, it is kneaded by the square roller. The combination of the square roller and the ultrasonic generator helps to effectively clean the hairiness on the surface of the cotton woven fabric.

[0024] In one embodiment of the present invention, the second water washing box does not include the surface-embossed square roller and the ultrasonic generator.

[0025] In one embodiment of the present invention, the washing liquid in the first washing tank includes 1-2 g / L of detergent and anti-redeposition agent respectively; and only water is added to the second washing tank without detergent and anti-redeposition agent.

[0026] In one embodiment of the present invention, during ultrasonic washing, the frequency is 25 to 40 KHZ, and the washing time is the time it takes for the fabric sample to pass through the first washing box, which is 20 to 30 seconds.

[0027] Beneficial effects of the present invention

[0028] (1) The present invention prepares a singeing-free descaling composite enzyme preparation by compounding amylase, alkaline pectinase, alkaline cellulase, and alkaline xylanase, and adding thereto auxiliary agents such as an enzyme compounding agent, an alkaline pH regulator, a chelating dispersant, and a penetrating emulsifier. The singeing-free descaling composite enzyme preparation of the present invention is applied to the pretreatment of cotton woven fabrics. Under the combined action of the composite enzyme and the auxiliary agents, the cotton woven fabrics after pretreatment have a higher pectin removal rate and a lower strength loss, and the hairiness of the cotton woven fabrics is greatly reduced, thereby achieving a singeing-free treatment.

[0029] (2) After the singeing-free desizing composite enzyme preparation provided by the present invention is used to pre-treat cotton woven fabrics, the desizing grade of the cotton woven fabrics can reach grade 8, the cottonseed hulls are basically removed, the water drop wetting time of the fabric sample is less than 1s, the hair effect of the fabric sample can reach a maximum of more than 11cm, and the strength retention rate of the fabric sample can reach 93%.

[0030] (3) After the singeing-free and deboiling composite enzyme preparation provided by the present invention is used to pre-treat cotton woven fabrics, the surface of the cotton woven fabrics is smooth and flat, and the hairiness is basically removed, which is consistent with the effect of conventional singeing and deboiling treatment.

[0031] (4) Compared with conventional pretreatment processes, the present invention reduces the number of steps, lowers the temperature, and avoids the discharge of a large amount of alkaline wastewater. While having certain economic benefits, it is in line with the concept of green development. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The hairiness removal of cotton cloth at different concentrations of the complex enzyme preparation in Example 2;

[0033] Figure 2 The hairiness removal of the cotton fabrics of Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3 is shown;

[0034] Figure 3 The hairiness removal conditions of the cotton fabrics of Comparative Examples 4, 5, and 6 are shown. DETAILED DESCRIPTION

[0035] The following examples further illustrate the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention. The following embodiments are illustrative, not restrictive, and the scope of protection of the present invention cannot be limited by the following embodiments. The methods used in the present invention, unless otherwise specified, are conventional methods in the art; the reagents used in the present invention, unless otherwise specified, are conventional reagents in the art.

[0036] The fabric treated in the present invention is measured for various technical indicators and the removal of fabric hairiness is evaluated with reference to standards HG / T 50800-2016 "Determination of the Desizing Effect of Desizing Agents for Textile Dyeing and Finishing on Starch Sizing", GB / T 3923.12013 "Tensile Properties of Textile Fabrics - Part 1: Determination of Breaking Strength and Elongation at Break (Strip Method)", and FZ / T 01071 2008 "Test Method for Capillary Effect of Textiles".

[0037] The specific activity of the amylase used in the following examples is 7647 U / g, where one activity unit is defined as the amount of amylase required to liquefy 1 g of soluble starch at 80°C and pH 9 in 1 hour. The specific activity of the alkaline pectinase is 236 U / g, where one activity unit is defined as the amount of alkaline pectinase required to cleave polygalacturonic acid at 80°C and pH 9 in 1 minute to produce 1 μmol of unsaturated polygalacturonic acid. The specific activity of the alkaline cellulase is 109 U / g, where one activity unit is defined as the amount of cellulase required to hydrolyze a sodium carboxymethyl cellulose substrate at 80°C and pH 9 in 1 hour to produce reducing sugars equivalent to 1 mg of glucose. The specific activity of the alkaline xylanase is 154 U / g, where one activity unit is defined as the amount of xylanase required to catalyze the hydrolysis of xylan to produce 1 μmol of xylose at 80°C and pH 9 in 1 minute.

[0038] Example 1

[0039] A singeing-free and deboiling complex enzyme preparation comprises, by weight percentage, 15% of amylase, 35% of alkaline pectinase, 8% of alkaline cellulase, 15% of alkaline xylanase, 5% of 1,3-propylene glycol, 2% of sodium carbonate, 10% of a chelating dispersant (TF-510TN) and 10% of a penetrating emulsifier (JFC-E).

[0040] A cotton cloth pretreatment method comprises the following steps:

[0041] (1) Pretreatment: Prepare a pretreatment working solution and perform padding pretreatment on the cotton cloth using two sets of surface-engraved square rollers. The pretreatment working solution includes 2 g / L of penetrating emulsifier JFC-E, 2 g / L of raising agent (NOS-06) and 4 g / L of urea. The padding pretreatment adopts a one-dip and one-pad method, with a padding rate of 90% and a padding temperature of 95°C.

[0042] (2) Padding: Prepare a singeing-free deboiling composite enzyme preparation working solution, and pad the cotton cloth after padding pretreatment. The concentration of the composite enzyme preparation in the composite enzyme preparation working solution is 20 g / L. The padding is performed by two dipping and two padding, the padding rate is 100%, and the padding temperature is 60°C.

[0043] (3) Steaming: The cotton pads after padding treatment were placed in a steaming device for steaming at a temperature of 80°C for 60 min.

[0044] (4) Water washing and drying: Two water washing boxes are set in the water washing device, wherein three groups of surface-engraved square rollers are set under the liquid surface of the first water washing box, and an ultrasonic generator is set in the water washing box. The water washing is further enhanced by the square rollers and ultrasonic vibration. The water washing liquid contains 1g / L of detergent (6508) and anti-redeposition agent (180S). The second water washing box does not contain surface-engraved square rollers and ultrasonic generators, and the second water tank does not contain detergent and anti-redeposition agent. After the water washing is completed, it enters multiple groups of drums for drying.

[0045] Example 2

[0046] The difference between Example 2 and Example 1 is that the concentration of the compound enzyme preparation in the compound enzyme preparation working solution is different. The concentration of the compound enzyme preparation in the compound enzyme preparation working solution is changed to 0, 6 g / L, 12 g / L, 18 g / L, 24 g / L and 30 g / L, respectively, to verify the desizing grade, hair effect, strong damage and hairiness removal of cotton cloth.

[0047] Table 1 Effect of the concentration of compound enzyme preparation on the pretreatment effect of cotton cloth

[0048] <![CDATA[Concentration of complex enzyme preparation / g·L -1 > 0 6 12 18 24 30 Desizing grade 4 7 8 8 8 8 Capillary effect / cm 3.4 6.7 8.5 10.8 11.3 11.5 Powerful damage / % 1.4 4.2 5.4 6.6 7.3 10.6 Pectin removal rate / % 13.4 22.6 51.9 64.2 70.8 75.6 Hairiness removal Difference Difference Difference good good good

[0049] From the data in Table 1, it can be seen that when the concentration of the complex enzyme preparation in the complex enzyme preparation working solution increases to 18 g / L, the hair effect of the cotton cloth can reach more than 10 cm, and the removal effect of impurities and hairiness is also good. However, as the concentration of the complex enzyme preparation further increases to 30 g / L, although more impurities and hairiness are removed, the strength damage of the cotton cloth is also greater.

[0050] Comparative Example 1

[0051] The difference between Comparative Example 1 and Example 1 is that in Comparative Example 1, the complex enzyme preparation working solution in step (2) is replaced with an alkaline working solution, and the alkaline working solution includes 40 g / L sodium hydroxide and 10 g / L scouring agent TF-1871A.

[0052] Table 2 Comparison of cotton cloth pretreatment effects in Example 1 and Comparative Example 1

[0053] Treatment Desizing grade Capillary effect / cm Powerful damage / % Pectin removal rate / % Hairiness removal Example 1 8 11.2 7.1 67.4 good Comparative Example 1 8 8.8 9.8 70.2 Difference

[0054] Comparative Example 2

[0055] The difference between Comparative Example 2 and Example 1 is that, in Comparative Example 2, the compound enzyme preparation working solution in step (2) of Example 1 is replaced with a conventional enzyme preparation working solution, wherein the conventional enzyme preparation working solution includes amylase s10004 2 g / L, pectinase s10007 8 g / L and scouring agent TF-1871A 5 g / L.

[0056] Table 3 Comparison of cotton cloth pretreatment effects in Example 1 and Comparative Example 2

[0057] Treatment Desizing grade Capillary effect / cm Powerful damage / % Pectin removal rate / % Hairiness removal Example 1 8 11.2 7.1 67.4 good Comparative Example 2 7 8.3 6.0 53.6 Difference

[0058] Comparative Example 3

[0059] The difference between Comparative Example 3 and Example 1 is that singeing treatment is performed before step (1) of Example 1.

[0060] Table 4 Comparison of cotton cloth pretreatment effects in Example 1 and Comparative Example 3

[0061] Treatment Desizing grade Capillary effect / cm Powerful damage / % Pectin removal rate / % Hairiness removal Example 1 8 11.2 7.1 67.4 good Comparative Example 3 8 9.0 11.3 72.5 good

[0062] Comparative Example 4

[0063] The difference between Comparative Example 4 and Example 1 is that the components in the complex enzyme preparation working solution in step (2) are adjusted, and the auxiliary agent 1,3-propylene glycol, sodium carbonate, chelating dispersant TF-510TN and penetrant JFC-E are not added.

[0064] Table 5 Comparison of cotton cloth pretreatment effects in Example 1 and Comparative Example 4

[0065] Treatment Desizing grade Capillary effect / cm Powerful damage / % Pectin removal rate / % Hairiness removal Example 1 8 11.2 7.1 67.4 good Comparative Example 4 7 10.5 6.9 59.5 Difference

[0066] Comparative Example 5

[0067] The difference between Comparative Example 5 and Example 1 is that the water washing in step (4) is replaced by conventional water washing.

[0068] Table 5 Comparison of cotton cloth pretreatment effects in Example 1 and Comparative Example 4

[0069] Treatment Desizing grade Capillary effect / cm Powerful damage / % Pectin removal rate / % Hairiness removal Example 1 8 11.2 7.1 67.4 good Comparative Example 5 7 10.9 6.8 64.6 Difference

[0070] Comparative Example 6

[0071] The difference between Comparative Example 6 and Example 1 is that the chelating dispersant TF-510TN in step (2) is replaced by a conventional dispersant (oxidized polyethylene wax).

[0072] Table 6 Comparison of cotton cloth pretreatment effects in Example 1 and Comparative Example 6

[0073] Treatment Desizing grade Capillary effect / cm Powerful damage / % Pectin removal rate / % Hairiness removal Example 1 8 11.2 7.1 67.4 good Comparative Example 6 8 11.0 7.0 63.8 Difference

[0074] Although the present invention has been disclosed above in terms of preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the definition of the claims.

Claims

1. A method for pre-treating cotton woven fabrics using a singeing-free descaling composite enzyme preparation, characterized in that: The following steps are involved: (1) Pretreatment: padding the cotton woven fabric with a pretreatment working solution comprising a penetrating emulsifier, a raising agent, and urea; (2) Padding: a composite enzyme preparation working solution is prepared using a singeing-free deboiling composite enzyme preparation, and the cotton woven fabric pretreated in step (1) is subjected to padding treatment using the working solution. The components of the composite enzyme preparation comprising, by weight percentage, 10-14% of amylase, 30-35% of alkaline pectinase, 8-10% of alkaline cellulase, 14-18% of alkaline xylanase, 4-5% of enzyme compounding agent, 1-2% of alkaline pH regulator, 7-11% of chelating dispersant and 8-10% of penetrating emulsifier are prepared using a singeing-free deboiling composite enzyme preparation working solution. The concentration of the composite enzyme preparation in the composite enzyme preparation working solution is 18-24 g / L. (3) steaming: placing the cotton woven fabric after the padding treatment in step (2) in a steaming device for high-temperature steaming; (4) Washing and drying: The cotton woven fabric after steaming in step (3) is subjected to ultrasonic washing and then put into drum drying; the specific steps of ultrasonic washing are as follows: two washing boxes are provided in the washing device, wherein a surface-engraved square roller is provided under the liquid surface of the first washing box, and an ultrasonic generator is also provided in the first washing box. When the cotton woven fabric after steaming passes through the first washing box, it is rubbed under the action of the square roller, and the hairiness on the surface of the cotton woven fabric is cleaned by ultrasonic vibration.

2. The method according to claim 1, characterized in that The alkaline cellulase is endoglucanase.

3. The method according to claim 1, characterized in that The chelating dispersant includes at least one of triethylhexyl phosphate, sodium lauryl sulfate, and fatty acid polyethylene glycol esters; the penetrating emulsifier includes fatty alcohol polyoxyethylene ether and / or alkylphenol polyoxyethylene ether; and the alkaline pH regulator includes at least one of sodium carbonate, sodium bicarbonate, and disodium hydrogen phosphate.

4. The method according to claim 1, wherein In the pretreatment working solution of step (1), the concentrations of the penetrating emulsifier, the raising agent and the urea are 1-2 g / L, 1-3 g / L and 3-5 g / L, respectively.

5. The method according to claim 1, wherein During the padding pretreatment in step (1), the fabric passes through two sets of surface-engraved square rollers, which are located below the liquid surface, with one dip and one padding. The padding rate is 80-90%, and the padding temperature is 90-100 °C.

6. The method according to claim 1, wherein In step (2), two dipping and two rolling are adopted, the rolling ratio is 90-110%, and the rolling liquid temperature is 40-60 °C.

7. The method according to claim 1, wherein In step (3), the steaming temperature is 70-90°C, and the steaming time is 40-60 min.

8. The method according to claim 1, characterized in that In step (4), the first water washing tank includes 1-2 g / L of detergent and 1-2 g / L of anti-redeposition agent.

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