阅读说明：本技术 一种改进的羊毛织物染色方法 (Improved wool fabric dyeing method ) 是由 曹秀明 许宏 许勇 刘丽艳 侯莉敏 杨强 潘万里 于 2020-08-20 设计创作，主要内容包括：本发明公开了一种改进的羊毛织物染色方法,包括以下步骤：S1：将羊毛织物浸渍于主要组成为还原剂、巯基多元酸、酸碱度调节剂和水的弱碱性预处理液中,升温并保温反应,取出羊毛织物并脱水烘干,然后浸轧氨基化明胶水溶液,预烘焙烘；S2：羊毛织物浸入酸性媒介染料的染液入染,升温至90～95℃保温染色,然后降温至65～75℃,加入媒染剂重铬酸钾溶液,然后再升温媒染；S2中染液的pH值为4～5.5。该改进的羊毛织物染色方法采用还原剂、氨基化凝胶预处理羊毛织物,能显著改善羊毛织物中羊毛纤维对酸性媒介染料的吸附上染性能,得色率、皂洗牢度和羊毛织物的抗毡缩性能均有提高。(The invention discloses an improved wool fabric dyeing method, which comprises the following steps: s1: soaking the wool fabric in a weakly alkaline pretreatment solution mainly comprising a reducing agent, a mercapto polyacid, a pH value regulator and water, heating, carrying out heat preservation reaction, taking out the wool fabric, dehydrating and drying, padding into an aminated gelatin aqueous solution, and pre-drying; s2: soaking the wool fabric into a dye solution of an acid mordant dye for dyeing, heating to 90-95 ℃, carrying out heat preservation dyeing, then cooling to 65-75 ℃, adding a mordant potassium dichromate solution, and then heating for mordant dyeing; the pH value of the dye solution in S2 is 4-5.5. The improved wool fabric dyeing method adopts the reducing agent and the amination gel to pretreat the wool fabric, can obviously improve the adsorption and dyeing performance of the wool fibers in the wool fabric on the acid mordant dye, and improves the color yield, the soaping fastness and the anti-felting performance of the wool fabric.)

1. An improved wool fabric dyeing method is characterized by comprising the following steps:

s1: soaking the wool fabric in a weakly alkaline pretreatment solution mainly comprising a reducing agent, a mercapto polyacid, a pH value regulator and water, heating, carrying out heat preservation reaction, taking out the wool fabric, dehydrating and drying, padding into an aminated gelatin aqueous solution, and pre-drying;

s2: soaking the wool fabric into a dye solution of an acid mordant dye for dyeing, heating to 90-95 ℃, carrying out heat preservation dyeing, then cooling to 65-75 ℃, adding a mordant potassium dichromate solution, and then heating for mordant dyeing;

and the pH value of the dye solution in the S2 is 4-5.5.

2. An improved wool fabric dyeing process according to claim 1 wherein the reducing agent is mercaptoethanol and/or dithiothreitol.

3. An improved wool fabric dyeing process according to claim 1, wherein said mercapto polyacid is at least one member selected from the group consisting of 2, 3-dimercaptomalonic acid, mercaptosuccinic acid, 2, 3-dimercaptosuccinic acid.

4. An improved wool fabric dyeing method according to claim 1, wherein the amount of the reducing agent is 7-13% o.w.f., the amount of the mercapto-polybasic acid is 0.2-2% o.w.f., the holding temperature in S1 is 55-70 ℃, and the reaction time is 2-5 h based on the mass of the wool fabric.

5. An improved wool fabric dyeing method according to claim 1, wherein the concentration of the aminated gelatin in the aqueous aminated gelatin solution is 1-3 g/L.

6. An improved wool fabric dyeing method according to claim 1, wherein the baking temperature is 125-135 ℃ and the baking time is 1.5-3 min.

7. An improved dyeing process for wool fabric according to claim 1, characterized in that the acid mordant dye is used in an amount of 1.4-2.2% o.w.f. based on the quality of the wool fabric, and the ratio of the mass of potassium dichromate to the mass of dye in the potassium dichromate solution is (20-30): 100.

8. An improved wool fabric dyeing method according to claim 1, wherein the pH value of the weakly alkaline pretreatment solution is 8-9.

Technical Field

The invention relates to the technical field of wool fabric dyeing, in particular to an improved wool fabric dyeing method.

Background

The mordant mechanism is mainly that a mordant such as metal ions is used as central ions to be matched with the dye and a ligand on the fiber to form a complex, and the dye is better dyed by utilizing the bridge function of the metal ions between the dye and the fiber. The mordant used for dyeing wool fabric with acid mordant dye is mainly dichromate, aluminum salt, copper salt and cobalt salt.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide an improved wool fabric dyeing method, which is characterized in that aminated gelatin is introduced to the fiber surface of a wool fabric, so that polar groups such as amino groups on the fiber surface are increased, and the positive charge of the aminated gelatin under an acidic condition is also beneficial to increasing the adsorption force between a dye and the fiber.

In order to achieve the technical effects, the technical scheme of the invention is as follows: an improved wool fabric dyeing method comprises the following steps:

s1: soaking the wool fabric in a weakly alkaline pretreatment solution mainly comprising a reducing agent, a mercapto polyacid, a pH value regulator and water, heating, carrying out heat preservation reaction, taking out the wool fabric, dehydrating and drying, padding into an aminated gelatin aqueous solution, and pre-drying;

s2: soaking the wool fabric into a dye solution of an acid mordant dye for dyeing, heating to 90-95 ℃, carrying out heat preservation dyeing, then cooling to 65-75 ℃, adding a mordant potassium dichromate solution, and then heating for mordant dyeing;

and the pH value of the dye solution in the S2 is 4-5.5.

The reducing agent can destroy disulfide bonds of the wool scale layer and generate active sulfydryl, the active sulfydryl and sulfydryl polybasic acid generate a shrinkage or sulfydryl reconstruction reaction, and more carboxyl groups are introduced to the surface of the wool fiber, so that the aminated gelatin can form a film on the surface of the fiber conveniently. The isoelectric point of the aminated gelatin is more than 7, so the aminated gelatin has positive charges under the acidic conditions of dyeing and mordant dyeing, and the acting force between the fiber and the dye is increased. The finishing liquor of the aminated gelatin can improve the felting property of wool fabrics.

The reducing agent is selected from sodium sulfite, sodium bisulfite, mercaptoethanol, etc., which react with disulfide bonds to form equimolar cysteine residues.

The preferable technical scheme is that the reducing agent is mercaptoethanol and/or dithiothreitol. Mercaptoethanol not only opens disulfide bonds, but also reacts with the mercapto polyacid.

The preferable technical scheme is that the mercapto polyatomic acid is at least one selected from 2, 3-dimercaptomalonic acid, mercaptosuccinic acid and 2, 3-dimercaptosuccinic acid.

The preferable technical scheme is that the mass of the wool fabric is taken as a reference, the using amount of the reducing agent is 7-13% o.w.f., the using amount of the mercapto polyacid is 0.2-2% o.w.f., the heat preservation temperature in S1 is 55-70 ℃, and the reaction time is 2-5 hours.

The preferable technical scheme is that the concentration of the aminated gelatin in the aminated gelatin aqueous solution is 1-3 g/L. The excessive amount of the aminated gelatin can cause the wool fabric to have excessive quality increase and hard hand feeling, and the excessive amount of the aminated gelatin does not obviously improve the color yield because the hydrophilic groups on the surfaces of the wool fibers treated by the reducing agent are increased.

The preferable technical scheme is that the baking temperature is 125-135 ℃, and the baking time is 1.5-3 min. The reaction between wool fibers, the mercapto polyacid and the aminated gel is sufficient at the preferred baking temperature.

The preferable technical scheme is that the use amount of the acid mordant dye is 1.4-2.2% o.w.f. based on the mass of the wool fabric, and the mass ratio of potassium dichromate to the dye in the potassium dichromate solution is (20-30): 100.

The preferable technical scheme is that the pH value of the alkalescent pretreatment solution is 8-9.

The invention has the advantages and beneficial effects that:

the improved wool fabric dyeing method adopts the reducing agent and the amination gel to pretreat the wool fabric, can obviously improve the adsorption and dyeing performance of the wool fibers in the wool fabric on the acid mordant dye, and improves the color yield, the soaping fastness and the anti-felting performance of the wool fabric.

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.

Serge dyeing, the source of the fabric is: jiangsu sunshine group;

sodium sulfite, mercaptoethanol, 2, 3-dimercaptomalonic acid, mercaptosuccinic acid, sodium acetate as pH regulator and potassium dichromate are all chemically pure. The acid mordant dye is mordant red S-80, and the hydroxyethyl sodium sulfonate is sold in the market, and the content is more than 98 percent.

The preparation method of the aminated gelatin comprises the following steps: the aminated gelatin is prepared by performing amidation reaction on gelatin and ethylenediamine in the presence of water-soluble carbodiimide. Specifically, gelatin is dissolved in a phosphoric acid buffer solution, ethylenediamine which is 3 times of the dry weight of the gelatin is added into 5% of the gelatin phosphoric acid buffer solution, the pH value of the buffer solution is adjusted to 5 by using a hydrochloric acid solution, then 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide salt which accounts for 40% of the dry weight of the gelatin is added, the reaction is carried out for 20 hours at the temperature of 30-40 ℃, and the mixed solution is dialyzed and freeze-dried.