CN111910452A - Pretreatment process for dyeing wool fabric by using acid dye and dyeing process - Google Patents
Pretreatment process for dyeing wool fabric by using acid dye and dyeing process Download PDFInfo
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- CN111910452A CN111910452A CN202010766458.3A CN202010766458A CN111910452A CN 111910452 A CN111910452 A CN 111910452A CN 202010766458 A CN202010766458 A CN 202010766458A CN 111910452 A CN111910452 A CN 111910452A
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- wool fabric
- wool
- reducing agent
- acid
- acid dye
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- 210000002268 wool Anatomy 0.000 title claims abstract description 77
- 239000004744 fabric Substances 0.000 title claims abstract description 62
- 239000000980 acid dye Substances 0.000 title claims abstract description 29
- 238000004043 dyeing Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical group NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- FCCDDURTIIUXBY-UHFFFAOYSA-N lipoamide Chemical compound NC(=O)CCCCC1CCSS1 FCCDDURTIIUXBY-UHFFFAOYSA-N 0.000 claims abstract description 20
- 235000019136 lipoic acid Nutrition 0.000 claims abstract description 12
- 229960002663 thioctic acid Drugs 0.000 claims abstract description 12
- 238000005406 washing Methods 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 10
- 238000002791 soaking Methods 0.000 claims abstract description 9
- 230000002378 acidificating effect Effects 0.000 claims abstract description 8
- 238000004321 preservation Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000003999 initiator Substances 0.000 claims abstract description 7
- DNJIEGIFACGWOD-UHFFFAOYSA-N ethyl mercaptane Natural products CCS DNJIEGIFACGWOD-UHFFFAOYSA-N 0.000 claims abstract description 5
- DGVVWUTYPXICAM-UHFFFAOYSA-N β‐Mercaptoethanol Chemical compound OCCS DGVVWUTYPXICAM-UHFFFAOYSA-N 0.000 claims abstract description 5
- AVSXGQJYEFAQNK-UHFFFAOYSA-N prop-2-enamide;hydrate Chemical compound O.NC(=O)C=C AVSXGQJYEFAQNK-UHFFFAOYSA-N 0.000 claims abstract description 4
- HATKUFQZJPLPGN-UHFFFAOYSA-N 2-phosphanylethane-1,1,1-tricarboxylic acid Chemical group OC(=O)C(CP)(C(O)=O)C(O)=O HATKUFQZJPLPGN-UHFFFAOYSA-N 0.000 claims abstract description 3
- AGBQKNBQESQNJD-UHFFFAOYSA-M lipoate Chemical compound [O-]C(=O)CCCCC1CCSS1 AGBQKNBQESQNJD-UHFFFAOYSA-M 0.000 claims abstract 2
- 239000007800 oxidant agent Substances 0.000 claims description 12
- 230000001590 oxidative effect Effects 0.000 claims description 9
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 8
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical group [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 5
- 235000010323 ascorbic acid Nutrition 0.000 claims description 4
- 229960005070 ascorbic acid Drugs 0.000 claims description 4
- 239000011668 ascorbic acid Substances 0.000 claims description 4
- 235000010265 sodium sulphite Nutrition 0.000 claims description 4
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 239000000975 dye Substances 0.000 abstract description 17
- 239000000835 fiber Substances 0.000 abstract description 15
- AGBQKNBQESQNJD-UHFFFAOYSA-N lipoic acid Chemical compound OC(=O)CCCCC1CCSS1 AGBQKNBQESQNJD-UHFFFAOYSA-N 0.000 description 11
- 230000004584 weight gain Effects 0.000 description 5
- 235000019786 weight gain Nutrition 0.000 description 5
- 125000003277 amino group Chemical group 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- -1 sodium carboxylate Chemical class 0.000 description 3
- 125000000542 sulfonic acid group Chemical group 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 239000004166 Lanolin Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229940039717 lanolin Drugs 0.000 description 2
- 235000019388 lanolin Nutrition 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 125000000075 primary alcohol group Chemical group 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 description 1
- 101710145505 Fiber protein Proteins 0.000 description 1
- 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 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 125000000539 amino acid group Chemical group 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- JZGWEIPJUAIDHM-UHFFFAOYSA-N chembl2007771 Chemical compound C1=CC=C2C(N=NC3=C4C(=CC(=CC4=CC=C3O)S(O)(=O)=O)S(O)(=O)=O)=CC=C(S(O)(=O)=O)C2=C1 JZGWEIPJUAIDHM-UHFFFAOYSA-N 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000985 reactive dye Substances 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/64—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing low-molecular-weight organic compounds without sulfate or sulfonate groups
- D06P1/651—Compounds without nitrogen
- D06P1/65168—Sulfur-containing compounds
- D06P1/65181—Compounds containing thiol groups
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/39—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using acid dyes
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/64—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing low-molecular-weight organic compounds without sulfate or sulfonate groups
- D06P1/642—Compounds containing nitrogen
- D06P1/649—Compounds containing carbonamide, thiocarbonamide or guanyl groups
- D06P1/6495—Compounds containing carbonamide -RCON= (R=H or hydrocarbons)
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/653—Nitrogen-free carboxylic acids or their salts
- D06P1/6533—Aliphatic, araliphatic or cycloaliphatic
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/667—Organo-phosphorus compounds
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
- D06P3/02—Material containing basic nitrogen
- D06P3/04—Material containing basic nitrogen containing amide groups
- D06P3/14—Wool
- D06P3/16—Wool using acid dyes
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/22—Effecting variation of dye affinity on textile material by chemical means that react with the fibre
Abstract
The invention discloses an acid dye dyeing pretreatment process for wool fabrics, which comprises the following steps: s1: soaking the wool fabric in alkaline reducing solution mainly comprising a first reducing agent, lipoamide and water, heating, carrying out heat preservation reaction, washing with water and drying; s2: soaking the wool fabric obtained in the step S1 in an acidic grafting treatment solution mainly comprising an initiator, an acrylamide monomer and water, and after grafting reaction, soaping, washing and drying to obtain a treated wool fabric; the first reducing agent is tricarboxyethylphosphine and/or mercaptoethanol, and the temperature rise reaction temperature is 55-70 ℃; the pH value of the alkaline reducing solution is 8-9. In the acid dye dyeing pretreatment process of the wool fabric, the reconstruction of disulfide bonds occurs between wool fibers and lipoic acid and/or lipoamide under the reducing agent and alkaline conditions, and then acrylamide is grafted to the surface of wool, so that the dye uptake of the acid dye is further improved.
Description
Technical Field
The invention relates to the technical field of wool fabric production, in particular to an acid dye dyeing pretreatment process and a dyeing process for wool fabric.
Background
The wool fabric is dyed by acid dye or reactive dye. The acid dye has complete chromatogram and bright color, mostly belongs to aromatic sodium sulfonate, contains sulfonic acid group, hydroxyl group and other groups, and a small number of sodium carboxylate are ionized in water to form pigment acid ions which can be combined with amino or amido of wool fibers.
How to further improve the dye uptake of the acid dye is one of the technical problems to be solved by the technical personnel in the field. In the prior art, like in wool spinning science, 2011, volume 1, 3, phase 1, acrylamide grafted weight gain of wool and performance research, acrylamide is used as a wool grafted weight gain monomer, under a hydrogen peroxide/ascorbic acid redox system, primary alcohol groups exist on amino acid residues of wool fiber protein molecules, hydroxyl groups lose protons, and the primary alcohol groups are combined with acrylamide to generate graft copolymerization. As the number of amido bonds on the surface of the wool fiber is increased, and the amino groups are combined with hydrogen ions under acidic conditions to enable the fiber to have positive charges, more acid dye anions can be attracted to be combined by ionic bonds, the dye uptake of the acid dye to the wool fiber is improved, and the apparent color depth of the fabric grafted with acrylamide is improved in the appearance of the fabric.
In the dyeing reaction of the acid dye, the wool fiber and the dye are mainly combined by ionic bonds under the condition of strong acid, and are mainly combined by Van der Waals force and hydrogen bonds under the condition of weak acid, although the integral dye uptake of the grafted wool fabric is improved by the acid dye, the wetting property of the grafted mercerized wool is reduced, the diffusion and permeation of the dye into the fiber are influenced, and the improvement of the dye uptake is not favorable.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the acid dye dyeing pretreatment process for the wool fabric, and the pretreated wool fabric has good wetting property and is beneficial to further improving the dye uptake.
In order to achieve the technical effects, the technical scheme of the invention is as follows: an acid dye dyeing pretreatment process for wool fabrics comprises the following steps:
s1: soaking the wool fabric in alkaline reducing solution mainly comprising a first reducing agent and water, heating and carrying out heat preservation reaction, then adding lipoic acid and/or lipoamide into a reaction system, continuing the heat preservation reaction, washing with water and drying;
s2: soaking the wool fabric obtained in the step S1 in an acidic grafting treatment solution mainly comprising an initiator, an acrylamide monomer and water, performing a grafting reaction, and then washing with hot water and drying to obtain a treated wool fabric;
the first reducing agent is tricarboxyethylphosphine and/or mercaptoethanol, and the temperature rise reaction temperature is 55-70 ℃; the pH value of the alkaline reducing solution is 8-9. And (3) heating for reaction for 3-6 h, and continuing to perform heat preservation reaction for 2-3 h after lipoic acid and/or lipoamide are added. The bath ratio of the wool fabric to the alkaline reducing solution and the acidic grafting treatment solution is 1: (20-30).
In the presence of alkali and a reducing agent, opening a disulfide five-membered ring in a lipoic acid and/or lipoamide molecular structure, reconstructing generated sulfydryl and sulfydryl generated by the breakage of a disulfide bond on the surface of wool fibers, opening the lipoic acid and/or lipoamide to generate an alkyl chain with a sulfydryl branched chain, and carrying out a grafting reaction on acrylamide and hydroxyl and amino on the surface of the wool fibers. Partial sulfydryl is converted into sulfonic group in the fabric drying and grafting process, and the number of amino, carboxyl and the like of hydrophilic groups on the surface of the treated wool fiber is increased, so that the grafted wool is beneficial to dyeing of acid dye.
The preferable technical scheme is that the lipoamide is dropwise added into the reaction system in the S1. The end of the alkyl chain of the lipoamide contains amide, wool fibers can attract more dye negative ions to dye under the acid dyeing condition, and compared with the liponic acid pretreatment, the dyeing rate can be further improved.
The preferable technical scheme is that the initiator consists of an oxidant and a second reducing agent, the oxidant is persulfate, the second reducing agent is selected from sodium sulfite and/or ascorbic acid, and the pH value of the acidic grafting treatment solution is 1-2. The pH value is increased, and the grafting weight gain rate of the wool fabric is reduced.
The preferable technical scheme is that the dosage of the first reducing agent is 7-13% o.w.f. and the dosage of the lipoamide is 1-5% o.w.f. based on the weight of the wool fabric. The usage amount of lipoamide is too large, the quantity of the sulfonic acid groups on the surface of the wool obtained by the first step of drying is increased, the grafting rate of acrylamide can be reduced due to the steric hindrance of the sulfonic acid groups, and the introduction of amino groups and the improvement of the dye uptake are not facilitated.
The preferable technical scheme is that the dosage of the acrylamide monomer is 7-12% o.w.f. based on the weight of the wool fabric. If the dosage of the acrylamide monomer is too large, the grafting weight gain of the wool fibers is increased, which can cause the hand feeling of the wool fabrics to be hard, and the probability of covering hydrophilic groups by the grafted polyacrylamide is increased.
The preferable technical scheme is that the concentration of the oxidant and the concentration of the second reducing agent are both 20-25% based on 100% of the concentration of the acrylamide monomer.
The preferable technical scheme is that the temperature of the grafting reaction is 18-24 ℃, and the grafting reaction time is 3-6 h.
In order to remove residual acrylamide monomer in the wool fabric, the preferable technical scheme is that the heating washing temperature is higher than 75 ℃.
The second purpose of the invention is to provide an acid dye dyeing process for wool fabrics, which comprises the acid dye dyeing pretreatment process for the wool fabrics.
The invention has the advantages and beneficial effects that:
the acid dye dyeing pretreatment process for the wool fabric has reasonable steps, the disulfide bond between the wool fiber and the lipoic acid and/or the lipoamide is reconstructed under the reducing agent and the alkaline condition, then the acrylamide is grafted to the surface of the wool, and the hydrophilic group and the branched chain at the chain end in the molecular structure of the lipoic acid and/or the lipoamide are both beneficial to improving the wettability of the wool fiber, so that the dye uptake of the acid dye is improved.
Detailed Description
The following further describes embodiments of the present invention with reference to examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The specifications of the wool fabric are as follows: full wool yarn knitted fabric, yarn fineness 15.7tex 2, size 50cm, fabric source: jiangsu sunshine group; acid dye: acid scarlet 3R, Tianjin Zhongjin chemical industry.
The dyeing process of the acid dye comprises the following steps: bath ratio of 1:20, soaking the fabric in 50 ℃ water for 15min, adding 2% o.w.f. dye and 4% o.w.f. acetic acid, heating to 95 ℃, keeping the temperature for 45min, washing with 50 ℃ warm water for 1 time, washing with cold water for 2 times, and drying.
Examples
Example 1
The acid dye dyeing pretreatment process for wool fabric of example 1 includes the following steps:
s1: soaking the wool fabric washed with the lanolin in alkaline reducing liquid mainly comprising mercaptoethanol and water at a bath ratio of 1:20, heating to 60-65 ℃, carrying out heat preservation reaction for 4 hours, then adding lipoic acid into the reaction system, continuing the heat preservation reaction for 3 hours, washing with water and drying; based on the weight of the wool fabric, the using amount of the first reducing agent is 7% o.w.f., the using amount of the lipoic acid is 2% o.w.f., and the pH value of the alkaline reducing solution is 9;
s2: soaking the wool fabric obtained in the step S1 in an acidic grafting treatment solution mainly comprising an initiator, an acrylamide monomer and water, wherein the bath ratio is 1:30, the temperature of the grafting reaction is 20-23 ℃, the grafting reaction time is 5 hours, and after the grafting reaction, the wool fabric is washed with water at the temperature of 75-80 ℃ and dried to obtain the treated wool fabric; in S2, the amount of acrylamide monomer is 7% o.w.f. based on the weight of the wool fabric; the initiator consists of an oxidant and a second reducing agent, wherein the oxidant is persulfate, and the second reducing agent is sodium sulfite; the concentration of the oxidant is 23% and the concentration of the second reducing agent is 20% based on the concentration of the acrylamide monomer as 100%; the pH of the acidic graft treatment solution was 1.5.
Example 2
Example 2 is based on example 1, with the difference that lipoamide is added dropwise to the reaction system in S1.
Example 3
Example 3 is based on example 2, with the difference that in S1 a composition of lipoamide and lipoic acid is added dropwise to the reaction system, the mass ratio of the two components being 1: 1.
Example 4
Example 4 is based on example 2, except that the pH of the basic reducing solution in S2 is 10.
Examples 5 to 6
Examples 5-6 are based on example 2 with the difference that example 5 uses 12% o.w.f. of the first reducing agent, 5% o.w.f. of the lipoamide, example 6 uses 12% o.w.f. of the first reducing agent and 8% o.w.f. of the lipoamide.
Examples 7 to 8
Examples 7-8 are based on example 2 except that in example 7 the second reducing agent is ascorbic acid and the oxidizing agent and the second reducing agent are both present at 25% concentration, based on 100% acrylamide monomer concentration; the concentrations of the oxidizing agent and sodium sulfite in example 8 were 30%.
Examples 9 to 10
Examples 9-10 are based on example 2 except that in S2 the acrylamide monomer is used in an amount of 12% o.w.f., based on the weight of the wool fabric; example 10 acrylamide monomer was used at 16% o.w.f.
Comparative example
The comparative example is based on example 1, and is characterized in that wool fabric washed to remove lanolin is soaked in alkaline reducing solution mainly composed of mercaptoethanol and water, the bath ratio is 1:20, the temperature is raised to 60-65 ℃, the reaction is carried out for 4 hours, and the wool fabric is washed and dried.
The results of the tests on the dyebaths and samples of the examples and comparative examples are as follows:
1. weighing the fabric before and after pretreatment, and calculating the grafting weight gain rate of the wool fabric;
2. testing the absorbance of the initial dye solution and the residual liquid by using a UV-3100PC ultraviolet spectrophotometer, and calculating the dye rate;
3. and (3) adopting a standard moisture regain to represent the moisture absorption performance of the fabric, and calculating the standard moisture regain: (W)Dipping in water-WDry matter)/WDry matter*100％。
The test results are given in the following table:
the amount of acrylamide grafted increases and the number of amino groups increases, but the increased amount of grafting also results in a slight decrease in the hydrophilic properties of the wool fabric, and therefore the dye uptake is affected by both of these factors. Comparative example S1 broke the scale layer and S2 grafted acrylamide.
The standard moisture regain of example 1, example 2, example 8 and example 9 is respectively 13.7%, 12.3%, 14.4% and 10.9%, the amount of acrylamide monomer is too large, the grafting amount is increased, the amino group on the surface of wool fiber is increased, but the moisture absorption performance of wool fabric is reduced, and the dye uptake is slightly increased; the increase of the dosage of the oxidant and the second reducing agent can lead more sulfydryl generated by the ring opening of the lipoic acid and/or the lipoamide to be oxidized into sulfonic group, so that the hydrophilic performance of the wool fabric is improved, but the self-polymerization of the acrylamide is increased, and the grafting rate is slightly reduced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The acid dye dyeing pretreatment process of the wool fabric is characterized by comprising the following steps of:
s1: soaking the wool fabric in alkaline reducing solution mainly comprising a first reducing agent and water, heating and carrying out heat preservation reaction, then adding lipoic acid and/or lipoamide into a reaction system, continuing the heat preservation reaction, washing with water and drying;
s2: soaking the wool fabric obtained in the step S1 in an acidic grafting treatment solution mainly comprising an initiator, an acrylamide monomer and water, performing a grafting reaction, and then washing with hot water and drying to obtain a treated wool fabric;
the first reducing agent is tricarboxyethylphosphine and/or mercaptoethanol, and the temperature rise reaction temperature is 55-70 ℃; the pH value of the alkaline reducing solution is 8-9.
2. The process of claim 1, wherein S1 is prepared by adding lipoamide dropwise into the reaction system.
3. The acid dye dyeing pretreatment process of wool fabric according to claim 1, wherein the initiator is composed of an oxidant and a second reducing agent, the oxidant is persulfate, the second reducing agent is selected from sodium sulfite and/or ascorbic acid, and the pH value of the acid grafting treatment solution is 1-2.
4. The pretreatment process for dyeing wool fabric according to claim 2, wherein the first reducing agent is used in an amount of 7-13% o.w.f., and the lipoamide is used in an amount of 1-5% o.w.f., based on the weight of the wool fabric.
5. The pretreatment process for dyeing wool fabric according to claim 1, wherein the amount of the acrylamide monomer is 7-12% o.w.f. based on the weight of the wool fabric.
6. The process of claim 1, wherein the concentrations of the oxidizing agent and the second reducing agent are both 20-25% based on 100% acrylamide monomer.
7. The acid dye dyeing pretreatment process for wool fabrics according to claim 1, wherein the temperature of the grafting reaction is 18-24 ℃, and the grafting reaction time is 3-6 h.
8. The wool fabric acid dye pretreatment process according to claim 1, wherein the heated water washing temperature is higher than 75 ℃.
9. A wool fabric acid dye dyeing process, which is characterized by comprising the wool fabric acid dye dyeing pretreatment process according to any one of claims 1 to 8.
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