CN115821568B - Flexible pretreatment process for pure cotton gauze - Google Patents
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- 229920000742 Cotton Polymers 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000009835 boiling Methods 0.000 claims abstract description 21
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 238000004061 bleaching Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 238000005406 washing Methods 0.000 claims description 31
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 238000006386 neutralization reaction Methods 0.000 claims description 17
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 14
- 239000012224 working solution Substances 0.000 claims description 14
- 239000004744 fabric Substances 0.000 claims description 10
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 6
- 229920002125 Sokalan® Polymers 0.000 claims description 6
- MRUAUOIMASANKQ-UHFFFAOYSA-N cocamidopropyl betaine Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC([O-])=O MRUAUOIMASANKQ-UHFFFAOYSA-N 0.000 claims description 6
- 229940073507 cocamidopropyl betaine Drugs 0.000 claims description 6
- 235000019387 fatty acid methyl ester Nutrition 0.000 claims description 6
- 239000004584 polyacrylic acid Substances 0.000 claims description 6
- 229920000570 polyether Polymers 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- -1 sodium alkyl sulfonate Chemical group 0.000 claims description 3
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 238000013329 compounding Methods 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 claims description 2
- 238000009991 scouring Methods 0.000 claims description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 2
- 230000003472 neutralizing effect Effects 0.000 claims 3
- 239000012535 impurity Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000003513 alkali Substances 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 239000010865 sewage Substances 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 3
- 230000014759 maintenance of location Effects 0.000 abstract description 3
- 229920001277 pectin Polymers 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 9
- 229920002678 cellulose Polymers 0.000 description 5
- 239000001913 cellulose Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 241001655736 Catalpa bignonioides Species 0.000 description 1
- 229920002201 Oxidized cellulose Polymers 0.000 description 1
- 125000005227 alkyl sulfonate group Chemical group 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229940107304 oxidized cellulose Drugs 0.000 description 1
- 239000001814 pectin Substances 0.000 description 1
- 235000010987 pectin Nutrition 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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- Detergent Compositions (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
The invention discloses a flexible pretreatment process of pure cotton gauze, which utilizes a low-alkali Soft-KA pretreatment agent and adopts a one-bath boiling and bleaching process to finish the flexible pretreatment production of the gauze. The process has the advantages of short flow, mild boiling and bleaching reaction, effective retention of natural cotton wax, removal of cotton seed hulls, pectic substances and other symbiotic impurities, effective retention of natural cotton wax, soft hand feeling, high production efficiency, high whiteness of boiled and bleached gauze and high breaking strength; compared with the conventional process, the COD value of the discharged waste liquid is greatly reduced, the sewage treatment cost is low, and the low-carbon environment-friendly development is met.
Description
Technical Field
The invention belongs to the technical field of textile printing and dyeing pretreatment, and particularly relates to a flexible pretreatment process for pure cotton gauze.
Background
Cotton gauze is a cotton fabric with sparse warp and weft and has obvious grids. The gauze has various varieties and wide application, and along with the improvement of living conditions of people, the pure cotton gauze product which is healthy, natural, soft, white, comfortable and environment-friendly is deeply favored by consumers.
The mature cotton fiber mainly comprises cellulose and non-cellulose impurities, wherein the cellulose and non-cellulose impurities contain 6-10% of non-cellulose impurities, mainly comprise pectin, wax, nitrogenous substances, pigment, ash and the like, and are distributed on a primary cell wall layer of the cotton fiber, so that the surface of the cotton fabric shows the hydrophobic property, and the subsequent processing and use are not facilitated. Therefore, in order to remove non-cellulosic impurities from cotton fabrics and improve the wettability of cotton yarns, the cotton yarns must be pre-treated.
The traditional cotton yarn cloth pretreatment process is completed by boiling and bleaching with a high-temperature high-alkali two-bath method, the alkali consumption is high, and if the process conditions are controlled improperly, cotton fibers are easy to form oxidized cellulose, so that strong damage is caused; in addition, the wax on the surface of the cotton fiber is removed cleanly, the gauze can lose due soft hand feeling, the folded cloth is uneven, and burrs and stubbles are exposed. In addition, because of strong alkali boiling and bleaching, the energy consumption and the water consumption are large in the production process, the COD value of the discharged waste liquid is also high, and the sewage treatment cost is high.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a flexible pretreatment process for pure cotton gauze, which utilizes a low-alkali Soft-KA pretreatment agent and adopts a one-bath boiling and bleaching process to finish the flexible pretreatment production of the gauze. The invention has the advantages of short process flow, mild boiling and bleaching reaction, effective retention of natural cotton wax, soft handfeel of gauze, good whiteness, no odor and no smell, and the gauze sheet is folded and flattened without the phenomena of burrs and stubbles.
The invention relates to a flexible pretreatment process of pure cotton gauze, which comprises the following steps:
(1) Feeding gauze into a cylinder: filling cotton yarn cloth into a high-temperature high-pressure boiling cylinder;
(2) Feeding: adding a boiling and bleaching working solution into a boiling cylinder at normal temperature;
(3) Heating and heat preservation: heating the working solution to 95-98 ℃, preserving heat for 45-60 min, and discharging the working solution;
(4) Washing with hot water: adding warm water at 40-50 ℃, heating to 80 ℃, washing for 10min, and discharging liquid;
(5) And (3) secondary cold water washing: adding warm water, washing for 7min each time, and draining;
(6) And (3) neutralization washing: adding citric acid accounting for 0.2-0.5% of the gauze weight for neutralization washing for 15min, and discharging the neutralization liquid when the pH value of the neutralization liquid is 5.5-6.5;
(7) Taking out the gauze from the jar and drying.
In the step (2), the scouring and bleaching working solution is a mixed solution formed by compounding a Soft-KA pretreatment agent, 98% sodium hydroxide and 27.5% hydrogen peroxide.
Further, the amount of Soft-KA pretreatment agent is 1.8-2.2% o.w.f,98% sodium hydroxide is 1.0-2.7% o.w.f, and 27.5% hydrogen peroxide is 6.5-8.5% o.w.f.
The Soft-KA pretreatment agent comprises the following raw materials in percentage by mass:
10-15% of fatty acid methyl ester ethoxylate FMEE (Shanghai Xihe Fine chemical Co., ltd.), 15-20% of secondary alkyl sodium sulfonate (Germany Clariant Co., ltd.), 5-10% of cocamidopropyl betaine (Suzhou Yuan Tai wetting chemical Co., ltd.), 3-5% of polyacrylic acid (Henan clear water source technology Co., ltd.), 5-8% of block polyether L-61 (Nantong catalpa sprout chemical Co., ltd.) and the balance of water.
The Soft-KA pretreatment agent is prepared by the following method:
(1) Slowly adding the block polyether L-61 into water, stirring at a speed of 200-300 rpm, and stirring for 5-10 min;
(2) Adding secondary sodium alkyl sulfonate and cocamidopropyl betaine into the system, stirring at a speed of 100-200 rpm for 5-10 min;
(3) Adding fatty acid methyl ester ethoxylate FMEE and polyacrylic acid into the system, stirring at 50-60 r/min, stirring for 10-15 min, filtering and discharging to obtain the Soft-KA pretreatment agent.
The invention has short process flow, adopts the Soft-KA pretreatment agent of the Oriental Meijie company, has mild boiling and bleaching reaction, effectively retains natural cotton wax, has Soft handfeel, good whiteness and high breaking strength of gauze, and has the advantages of flat and folded gauze piece and no burr and stubble phenomenon. The process has high production efficiency, greatly reduces the COD value of the discharged waste liquid compared with the conventional process, has low sewage treatment cost and accords with low-carbon and environment-friendly development.
Detailed Description
The technical scheme of the invention is further described below with reference to specific embodiments.
Example 1: preparation of Soft-KA pretreatment agent
The raw materials comprise the following components in percentage by weight: fatty acid methyl ester ethoxylate FMEE 10%, sodium secondary alkyl sulfonate 20%, cocamidopropyl betaine 5%, polyacrylic acid 3%, block polyether L-615%, and water in balance.
The preparation method of the Soft-KA pretreatment agent.
(1) Slowly adding the block polyether L-61 into water, stirring at a speed of 200rpm for 10min;
(2) Adding secondary sodium alkyl sulfonate and cocamidopropyl betaine, stirring at a stirring speed of 100 rpm for 10min;
(3) Adding fatty acid methyl ester ethoxylate FMEE and polyacrylic acid, stirring at 60 r/min for 15min, filtering, and discharging to obtain Soft-KA pretreatment agent.
Example 2:
a flexible pretreatment process for pure cotton gauze specifically comprises the following steps:
(1) Feeding gauze into a cylinder: 1800kg of 40 pieces of 29 x 22.3 x 122 pure cotton gauze grey cloth is put into a high-temperature high-pressure boiling cylinder;
(2) Feeding: at normal temperature, 36kg of a Soft-KA pretreatment agent (diluted with water 1:2) solution of Oriental Meijie company is added into an auxiliary tank, the auxiliary tank is pumped into a boiling tank for 5min, 27kg of a solution of 98% sodium hydroxide (diluted with water 1:10) is added into the auxiliary tank for 5min, the temperature is raised to 50 ℃, 135kg of a solution of 27.5% hydrogen peroxide (diluted with water 1:5) is added into the auxiliary tank, and the bath ratio is as follows: 1:5;
(3) Heating and heat preservation: heating the working solution to 98 ℃, preserving heat for 50min, and discharging the working solution;
(4) Washing with hot water: adding 40 ℃ warm water, heating to 80 ℃, washing for 10min, and draining;
(5) And (3) secondary cold water washing: adding warm water, washing for 7min each time, and draining;
(6) And (3) neutralization washing: adding 5kg of citric acid for neutralization washing for 15min, and discharging the neutralization liquid when the pH value of the neutralization liquid is 6.5;
(7) Taking out the gauze from the jar and drying.
The main technical indexes of the flexible gauze pretreated by the process are as follows:
example 3:
a flexible pretreatment process for pure cotton gauze specifically comprises the following steps:
(1) Feeding gauze into a cylinder: 1600kg of 40 pieces of 24.4 x 15.7 x 158 pure cotton gauze grey cloth are put into a high-temperature high-pressure boiling cylinder;
(2) Feeding: at normal temperature, 30kg of a Soft-KA pretreatment agent (diluted with water 1:2) solution of Oriental Meijie company is added into an auxiliary tank, the auxiliary tank is pumped into a boiling tank for 5min, 25kg of a solution of 98% sodium hydroxide (diluted with water 1:10) is added into the auxiliary tank for 5min, the temperature is raised to 50 ℃, 112kg of a solution of 27.5% hydrogen peroxide (diluted with water 1:5) is added into the auxiliary tank, and the bath ratio is as follows: 1:5;
(3) Heating and heat preservation: heating the working solution to 98 ℃, preserving heat for 50min, and discharging the working solution;
(4) Washing with hot water: adding 40 ℃ warm water, heating to 80 ℃, washing for 10min, and draining;
(5) And (3) secondary cold water washing: adding warm water, washing for 7min each time, and draining;
(6) And (3) neutralization washing: adding 4kg of citric acid for neutralization washing for 15min, and discharging the neutralization liquid when the pH value of the neutralization liquid is 6.5;
(7) Taking out the gauze from the jar and drying.
The main technical indexes of the flexible gauze pretreated by the process are as follows:
Example 4:
a flexible pretreatment process for pure cotton gauze specifically comprises the following steps:
(1) Feeding gauze into a cylinder: charging 2500kg of 22 pieces of 29 x 24.4 x 120 pure cotton gauze grey cloth into a high-temperature high-pressure boiling cylinder;
(2) Feeding: at normal temperature, 55kg of a Soft-KA pretreatment agent (diluted with water 1:2) solution of Oriental Meijie company is added into an auxiliary tank, the auxiliary tank is pumped into a boiling tank for 5min, 40kg of a solution of 98% sodium hydroxide (diluted with water 1:10) is added into the auxiliary tank for 5min, the temperature is raised to 50 ℃, 180kg of a solution of 27.5% hydrogen peroxide (diluted with water 1:5) is added into the auxiliary tank, and the bath ratio is as follows: 1:5;
(3) Heating and heat preservation: heating the working solution to 95 ℃, preserving heat for 55min, and discharging the working solution;
(4) Washing with hot water: adding 40 ℃ warm water, heating to 80 ℃, washing for 10min, and draining;
(5) And (3) secondary cold water washing: adding warm water, washing for 7min each time, and draining;
(6) And (3) neutralization washing: adding 7kg of citric acid for neutralization washing for 15min, and discharging the neutralization liquid when the pH value of the neutralization liquid is 6.5;
(7) Taking out the gauze from the jar and drying.
The main technical indexes of the flexible gauze pretreated by the process are as follows:
Examples comparison:
The flexible pretreatment process of the pure cotton gauze is compared with the conventional pretreatment process of the pure cotton gauze (taking 22 counts of 29 to 24.4 to 120 gauze per cylinder as an example) and the following steps are adopted:
(1) The flexible pretreatment of the pure cotton gauze is compared with the conventional pretreatment in material proportion:
(2) The flexible pretreatment of the pure cotton gauze is compared with the conventional pretreatment process flow:
(3) The flexible pretreatment of the pure cotton gauze is compared with the conventional pretreatment test result:
Compared with the conventional process, the method has the advantages of less material consumption, no overflow washing, low boiling and bleaching temperature, energy and water conservation, high production efficiency, good whiteness of the treated gauze and high breaking strength; the boiling and bleaching reaction can effectively protect cotton fibers, remove cotton seed hulls, pectic substances and other symbiotic impurities, effectively retain natural cotton wax and have soft handfeel; compared with the conventional process, the COD value of the discharged waste liquid is greatly reduced, the sewage treatment cost is low, and the low-carbon environment-friendly development is met.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various changes and modifications can be made by those skilled in the art within the principle and framework of the present invention, and any modifications, substitutions and the like should be included in the scope of the present invention.
Claims (1)
1. A flexible pretreatment process for pure cotton gauze is characterized by comprising the following steps:
(1) Feeding gauze into a cylinder: filling cotton yarn cloth into a high-temperature high-pressure boiling cylinder;
(2) Feeding: adding a boiling and bleaching working solution into a boiling cylinder at normal temperature;
(3) Heating and heat preservation: heating the working solution to 95-98 ℃, preserving heat for 45-60 min, and discharging the working solution;
(4) Washing with hot water: adding warm water at 40-50 ℃, heating to 80 ℃, washing for 10min, and discharging liquid;
(5) And (3) secondary cold water washing: adding warm water, washing for 7min each time, and draining;
(6) And (3) neutralization washing: adding citric acid accounting for 0.2-0.5% of the weight of the gauze, neutralizing and washing for 15min, and discharging the neutralizing liquid when the pH value of the neutralizing liquid is 5.5-6.5;
(7) Taking out the gauze from the jar and drying;
In the step (2), the scouring and bleaching working solution is a mixed solution formed by compounding a Soft-KA pretreatment agent, 98% sodium hydroxide and 27.5% hydrogen peroxide; the dosage of the Soft-KA pretreatment agent is 1.8-2.2% of o.w.f, the dosage of 98% sodium hydroxide is 1.0-2.7% of o.w.f, and the dosage of 27.5% hydrogen peroxide is 6.5-8.5% of o.w.f;
The Soft-KA pretreatment agent comprises the following raw materials in percentage by mass:
10-15% of fatty acid methyl ester ethoxylate FMEE, 15-20% of secondary alkyl sodium sulfonate, 5-10% of cocamidopropyl betaine, 3-5% of polyacrylic acid, 5-8% of block polyether L-61 and the balance of water;
The Soft-KA pretreatment agent is prepared by the following method:
(1) Firstly, slowly adding the block polyether L-61 into water, stirring at a speed of 200-300 r/min, and stirring for 5-10 min;
(2) Adding secondary sodium alkyl sulfonate and cocamidopropyl betaine into the system, stirring at a speed of 100-200 rpm, and stirring for 5-10 min;
(3) Adding fatty acid methyl ester ethoxylate FMEE and polyacrylic acid into the system, stirring at 50-60 r/min, stirring for 10-15 min, filtering and discharging to obtain the Soft-KA pretreatment agent.
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| CN106758199B (en) * | 2016-12-26 | 2019-02-15 | 上海市纺织科学研究院 | A kind of pre-treatment processing technology of silk floss |
| CN108085959A (en) * | 2017-12-30 | 2018-05-29 | 绍兴恒钧环保科技有限公司 | Cotton fabric short-flow pre-treating process |
| CN109837733B (en) * | 2019-01-29 | 2021-08-31 | 合肥市东方美捷分子材料技术有限公司 | Vitamin state energy-saving degreasing bleaching process for cellulose fibers |
| CN109944056A (en) * | 2019-03-26 | 2019-06-28 | 孚日集团股份有限公司 | A kind of cylinder yarn short-flow pre-treating process |
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| "医用纱布的低碱短流程练漂工艺"，丁文俊等，印染助剂，第39卷第8期，第58-61页;丁文俊等;印染助剂;第39卷(第8期);第58-61页 * |
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