阅读说明：本技术 一种用于活性染料直接印花的印花糊料的制备方法 (Preparation method of printing paste for direct printing of reactive dye ) 是由 刘鹏远 何鑫 厉安昕 卞鹏 苏忠奎 武立忠 庞磊 于 2020-03-06 设计创作，主要内容包括：一种用于活性染料直接印花的印花糊料的制备方法,属于化学印染技术领域,所述方法为以1-5wt％的硫酸或磷酸作催化剂,在pH为2-5,反应温度为100℃-135℃的温度下,将海藻酸与HO-R-COOH、HOOC-R-COOH反应(R＝烷基、苯基、环烷基),按照物质的量比为1∶1.2-1∶3反应12-24h,反应结束后用乙醇溶液清洗,产物在85℃-100℃温度下烘干,获得海藻酸酯粉末即制备的印花糊料。通过该方法制得的印花糊料在水中的溶解性大,包水性好,印花轮廓清晰,脱糊率高,水洗后印花面料手感柔软,同时稳定性好,增稠效果明显,不易水解的海藻酸酯类活性染料印花糊料。(A process for preparing printing paste used for direct printing of reactive dye includes using 1-5 wt% sulfuric acid or phosphoric acid as catalyst, reacting alginic acid with HO-R-COOH and HOOC-R-COOH at pH 2-5 and reaction temp 100-135 deg.C for 12-24 hr according to substance quantity ratio of 1: 1.2-1: 3, washing with alcohol solution after reaction, and drying at 85-100 deg.C to obtain alginate powder. The printing paste prepared by the method has the advantages of high solubility in water, good water-covering property, clear printing outline, high paste removal rate, soft hand feeling of the printed fabric after washing, good stability, obvious thickening effect and difficult hydrolysis.)

1. A preparation method of printing paste for direct printing of reactive dyes is characterized by comprising the following steps: the method comprises the steps of using 1-5 wt% of sulfuric acid or phosphoric acid as a catalyst, reacting alginic acid with HO-R-COOH and HOOC-R-COOH (R ═ alkyl, phenyl and cycloalkyl) at the pH value of 2-5 and the reaction temperature of 100-135 ℃, reacting for 12-24 hours according to the mass ratio of 1: 1.2-1: 3, cleaning with an ethanol solution after the reaction is finished, and drying the product at the temperature of 85-100 ℃ to obtain alginate powder, namely the prepared printing paste.

2. A process for the preparation of printing pastes for direct printing of reactive dyes according to claim 1, characterized in that: the method is specifically characterized in that alginic acid reacts with glycolic acid, oxalic acid and propanoic acid.

Technical Field

The invention belongs to the technical field of chemical printing and dyeing, and particularly relates to a preparation method of a printing paste for direct printing of reactive dyes.

Background

The printing paste is a substance added in printing paste to play a thickening role, and generally can be dissolved in water or fully swelled and dispersed in water to form a colloidal solution. When the printing paste is prepared, the reactive dye is dissolved in water and then uniformly dispersed in the printing paste, namely the printing paste is a carrier of the paste. The printing paste for preparing the printing paste directly influences the printing quality, such as the technical indexes of color yield, printing definition, dye uptake and permeability, paste residue after printing and the like. Therefore, the printing paste plays an important role in printing production and is one of the main factors which restrict the product quality, the production cost and the economic benefit. At present, the most used printing and dyeing industry in China is sodium alginate organic printing paste. The natural polysaccharide carbohydrate alginic acid extracted from kelp is difficult to dissolve in water and can not be used as an active printing paste, so the alginic acid and sodium carbonate are subjected to neutralization reaction to generate strong-base weak-acid salt sodium alginate, although the sodium alginate has high solubility in water, good water-covering property, clear printing outline and high paste removal rate, the printed fabric is soft to touch after being washed with water, but is easy to hydrolyze, the prepared color paste has short stability period during use, can only be stored for 2 days at normal temperature, and needs to be prepared for use in summer, thus being inconvenient and causing a great deal of waste. Sodium alginate is a strong base and weak acid salt substance, and can generate hydrolysis reaction after being dissolved in water to generate water-insoluble alginic acid, so that the thickening effect and the water retention of the alginic acid are deteriorated, and the reactive dye is separated out from printing paste to cause the failure of printing paste.

Disclosure of Invention

In order to solve the technical problems, the invention provides a preparation method of printing paste for direct printing of reactive dyes, and the printing paste prepared by the method has the advantages of high solubility in water, good water-covering property, clear printing outline, high paste removal rate, soft hand feeling of printed fabrics after washing, good stability, obvious thickening effect and difficult hydrolysis.

The invention adopts the following technical scheme:

a process for preparing the printing paste used for direct printing of reactive dye includes such steps as using 1-5 wt% sulfuric acid or phosphoric acid as catalyst, reacting alginic acid with HO-R-COOH and HOOC-R-COOH at 100-135 deg.C and pH value of 2-5 for 12-24 hr at the ratio of 1: 1.2-1: 3, washing with alcohol solution, and baking at 85-100 deg.C to obtain alginate powder.

Further, the method specifically comprises the step of reacting alginic acid with glycolic acid, oxalic acid and propanoic acid.

The invention has the advantages and effects that:

alginic acid is used as a base material, and reacts with hydroxyl and carboxyl groups in substances with HO-R-COOH structures such as glycolic acid and the like and substances with HOOC-R-COOH structures such as oxalic acid and the like under the condition of an acid or alkali catalyst to generate products, the products are used as printing paste for direct printing of reactive dyes, and the printing paste for the alginic acid ester reactive dyes has the advantages of high solubility in water, good water-covering property, clear printing contour, good printing uniformity, high paste removal rate, soft handfeel of printed fabrics after washing, good stability, high viscosity, obvious thickening effect and difficult hydrolysis.

Drawings

FIG. 1 is a graph of the viscosities and changes thereof of example 1, example 2, example 3 and comparative example 1;

FIG. 2 is a K/S data distribution diagram of application example 1;

FIG. 3 is a K/S data distribution diagram of application example 2;

FIG. 4 is a K/S data distribution diagram of application example 3;

FIG. 5 is a K/S data distribution diagram of comparative example 2;

FIG. 6 is an infrared spectrum of a product of application example 1;

FIG. 7 is a reaction scheme of application example 1.

Detailed Description

The invention is further illustrated by the following examples.

Alginic acid is an organic acid, carboxyl contained in the alginic acid can be condensed with hydroxyl and carboxyl groups in substances with HO-R-COOH structure such as glycolic acid and substances with HOOC-R-COOH structure such as oxalic acid under the conditions of high temperature and acid or alkali catalyst to generate alginate ester, the alginic acid and glycolic acid, oxalic acid, propanoic acid and the like are reacted for 12 to 24 hours according to the mass ratio of 1: 1.2 to 1: 3 at the pH of 3 to 5 and the reaction temperature of 100 to 135 ℃ by using 1 to 5 weight percent of sulfuric acid or phosphoric acid as the catalyst, the alginic acid is washed by ethanol solution after the reaction is finished, and the product is dried at the temperature of 85 to 100 ℃ to obtain alginate ester powder.