阅读说明：本技术 印花前处理浆料及其制备方法和腈纶织物喷墨印花工艺 (Printing pretreatment slurry, preparation method thereof and ink-jet printing process of acrylic fabric ) 是由 郝继尧 于 2020-07-20 设计创作，主要内容包括：本发明公开了一种印花前处理浆料及其制备方法和腈纶织物喷墨印花工艺,该印花前处理浆料包括以下重量份计的原料：1～5份阳离子糊料、3～12份助溶剂、2～4份pH缓冲剂、0～4份电解质、0～2份增稠剂和0.2～2份缓染剂。该前处理浆料用于腈纶织物阳离子染料墨水喷墨印花的前处理,进而喷墨打印印花所得的图案轮廓清晰,颜色艳丽,各项色牢度好,且上染步骤简单。(The invention discloses printing pretreatment slurry, a preparation method thereof and an acrylic fabric ink-jet printing process, wherein the printing pretreatment slurry comprises the following raw materials in parts by weight: 1-5 parts of cationic paste, 3-12 parts of cosolvent, 2-4 parts of pH buffering agent, 0-4 parts of electrolyte, 0-2 parts of thickening agent and 0.2-2 parts of retarding agent. The pretreatment slurry is used for pretreatment of the ink-jet printing of the cationic dye ink of the acrylic fabric, and then patterns obtained by ink-jet printing are clear in outline, bright in color, good in various color fastness and simple in dyeing steps.)

1. The printing pretreatment slurry is characterized in that the printing pretreatment slurry is used for pretreatment of ink jet printing of cationic dye ink of acrylic fabric, and the pretreatment is sizing treatment; the printing pretreatment sizing agent comprises the following raw materials in parts by weight: 1-5 parts of cationic paste, 3-12 parts of cosolvent, 2-4 parts of pH buffering agent, 0-4 parts of electrolyte, 0-2 parts of thickening agent and 0.2-2 parts of retarding agent.

2. The pre-printing treatment paste according to claim 1, wherein the viscosity of the pre-printing treatment paste is 1000 to 2400 mPa-s, and the pH value is 4 to 6.

3. The pre-printing treatment slurry according to claim 1, wherein the cationic paste is at least one selected from modified starch, guar gum, tamarind gum, sodium alginate and polyacrylate.

4. The pre-printing treatment slurry according to claim 1, wherein the cosolvent is at least one selected from urea, diethylene glycol ether and thiodiethanol.

5. The pre-printing treatment slurry according to claim 1, wherein the pH buffer is at least one selected from the group consisting of citric acid, lactic acid, acetic acid, malic acid, tartaric acid, and ammonium sulfate.

6. The pre-printing treatment slurry according to claim 1, wherein the electrolyte is selected from at least one of anhydrous sodium sulphate and sodium chloride; the thickener is at least one of fumed silica, xanthan gum and guar gum.

7. The pre-printing treatment paste according to any one of claims 1 to 6, wherein the dye-retarding agent is at least one selected from the group consisting of dye-retarding agents 1227 and 1631.

8. A method for preparing pre-printing treatment paste according to any one of claims 1 to 7, characterized by comprising the steps of:

mixing a cosolvent, an electrolyte, a pH buffering agent, a retarding agent and deionized water; and then adding a thickening agent and a cationic paste under the stirring state, fully stirring and dispersing, filtering to remove insoluble impurities, and standing until the cationic paste is completely gelatinized to prepare the pre-printing treatment slurry.

9. An ink jet printing process for acrylic fabric is characterized by comprising the following steps:

s1, sizing the acrylic fabric by using the sizing agent before printing of any claim 1 to 7, and then drying the sized acrylic fabric;

and S2, carrying out ink-jet printing on the acrylic fabric treated in the step S1 by adopting cationic dye ink, and then carrying out steaming and washing treatment.

10. A textile characterized by being produced by the ink jet printing process of the acrylic fabric as claimed in claim 9.

Technical Field

The invention relates to textile printing and dyeing, in particular to printing pretreatment slurry, a preparation method thereof and an ink jet printing process of acrylic fabric.

Background

The cationic dye is a cationic dye, has water solubility, is mainly used for dyeing acrylic fibers, introduces a third monomer in the polymerization process of the acrylic fibers to ensure that fiber molecules contain a certain number of groups with negative charges, and can be combined with the positive charges of the cationic dye by ionic bonds during dyeing. The acrylic fibers are dyed by the cationic dye, almost cannot be dyed below the glass transition temperature, and when the glass transition temperature is exceeded, the dyeing rate is increased sharply, and the acrylic fibers are very easy to dye. Therefore, the dye consumption is required to be controlled in the traditional dye bath dyeing, the heating and cooling rates are strictly controlled during dyeing, frequent stirring is required, the operation is complicated, and color difference is easy to occur.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a printing pretreatment slurry, a preparation method thereof and an acrylic fabric printing and dyeing process.

The technical scheme adopted by the invention is as follows:

the first aspect of the invention provides printing pretreatment slurry, which is used for pretreatment of ink-jet printing of cationic dye ink of acrylic fabric, wherein the pretreatment is sizing treatment; the printing pretreatment sizing agent comprises the following raw materials in parts by weight: 1-5 parts of cationic paste, 3-12 parts of cosolvent, 2-4 parts of pH buffering agent, 0-4 parts of electrolyte, 0-2 parts of thickening agent and 0.2-2 parts of retarding agent.

According to some embodiments of the invention, the pre-printing treatment paste has a viscosity of 1000 to 2400mPa · s and a pH of 4 to 6. Because the cationic dye has sensitivity to the pH value, the pH range of the general cationic dye is 2.5-5.5, and the cationic dye is converted into an electron-withdrawing group from an electron-donating group when the pH value is lower, so that the color of the dye is changed; at higher pH values, the cationic dye forms quaternary ammonium base or the structure is destroyed, and the cationic dye precipitates, discolors, or fades.

According to some embodiments of the invention, the cationic paste is selected from at least one of modified starch, guar gum, tamarind gum, sodium alginate, polyacrylate.

According to some embodiments of the invention, the co-solvent is selected from at least one of urea, diethylene glycol ether, thiodiethanol.

According to some embodiments of the invention, the pH buffer is selected from at least one of citric acid, lactic acid, acetic acid, malic acid, tartaric acid, ammonium sulfate.

According to some embodiments of the invention, the electrolyte is selected from at least one of anhydrous sodium sulphate, sodium chloride.

According to some embodiments of the invention, the thickener is selected from at least one of fumed silica, xanthan gum, guar gum.

When the acrylic fiber fabric is dyed with the cationic dye, the acrylic fiber fabric is hardly dyed below the glass transition temperature, and the cationic dye is dyed rapidly when the glass transition temperature of the acrylic fiber fabric is exceeded. Therefore, the dyeing retarding agent is added into the sizing agent before printing to facilitate the cationic dye to dye the acrylic fabric, so that the printing effect of the fabric can be improved. The retarding agent can be classified into a fiber-philic retarding agent, a dye-philic retarding agent and a retarding agent having affinity for both dyes and fibers. And to the acrylic fabric dye-uptake cation dyestuff often use be the hydrophilic fiber type slow-dyeing agent, hydrophilic fiber type slow-dyeing agent and cation dyestuff take place the counter-dyeing effect to the fibre, and the slow-dyeing agent preferentially combines with the fibre, has occupied the dyeing base on the fibre, delays the dye-uptake, but because the cohesion of slow-dyeing agent and fabric does not have dye molecule and fabric cohesion reinforce, so along with the rising of dye-uptake temperature, the dyestuff is from replacing the slow-dyeing agent from the fibre gradually again to reach level dyeing effect.

According to some embodiments of the invention, the slow-release agent is selected from at least one of a slow-release agent 1227, a slow-release agent 1631.

In a second aspect of the present invention, there is provided a method for preparing any one of the pre-printing treatment pastes provided in the first aspect of the present invention, comprising the following steps: mixing cosolvent, electrolyte, pH buffer, retarding agent and deionized water, adding thickener and cationic paste under stirring, stirring thoroughly, dispersing uniformly, filtering to remove insoluble impurities, and standing until the cationic paste is completely gelatinized. In the above preparation process, after the thickener and the cationic paste are added, the viscosity of the system gradually increases along with the swelling of the cationic paste and the thickener, and the rotation speed of stirring needs to be increased, and stirring with large shearing force (for example, using a dispersion disc-zigzag stirring rod) is generally used for stirring to facilitate the dispersion and gelatinization of the cationic paste; the stirring position is arranged at the middle lower part of the container, the stirring speed when the viscosity is highest is generally controlled to be 1500-2000 r/min, other time is determined according to the viscosity of the slurry, so that the mixture can be uniformly and rapidly stirred, and the total stirring time is generally 3-4 h. And after the paste is completely gelatinized, standing for a period of time, measuring the pH value of the paste, and controlling the pH value of the pretreated slurry to be 4-6. The prepared sizing agent before printing is used up as soon as possible, the sizing agent which cannot be used up in a short time is placed at a low temperature of about 10 ℃, and the sizing agent is stirred uniformly when used next time.

The fabrics made of different materials have different fiber compositions, such as pure cotton-natural cellulose fiber, polyamide-polyamide fiber, wool, silk-natural protein fiber, acrylic fiber-polyacrylonitrile fiber, and terylene-polyester fiber. The inventors have found that the properties exhibited by fabrics made from fibers vary from fiber to fiber, and that the dye uptake and the pretreatment size differ from each other. The cotton fiber fabric is suitable for dyeing reactive dyes and vat dyes, and the used sizing agent is alkaline; the chinlon is suitable for dyeing acid dye, and the used sizing agent is acidic; wool and silk are suitable for dyeing active and acid dyes, and the size is determined according to specific dye-uptake dyes; the terylene is suitable for dyeing disperse dyes, and the used sizing agent is neutral and slightly alkaline; and the acrylic fiber is suitable for dyeing cationic dye, and the used sizing agent is acidic. In addition, the inventor also finds that besides the acid-base property, other materials and proportions of the sizing agent used by different fabrics are different, such as a dyeing-resistant salt is often added into the cotton fiber pretreatment sizing agent to prevent the defects of the printing sample caused by the reducing gas released by the reactive dye during steaming; the time of the wool in printing and steaming is obviously longer than that of cotton fabrics; the temperature of the polyester printing steam is up to 180 ℃; the addition of the retarding agent in the acrylic printing steam can improve the printing quality. Therefore, the proportion and the material selection of the sizing agent before printing are different for different printed fabrics.

The third aspect of the invention provides an ink jet printing process for acrylic fabric, which comprises the following steps:

s1, adopting any one of the pre-printing treatment sizing agents provided by the first aspect of the invention to perform sizing treatment on the acrylic fabric, and then performing drying treatment on the acrylic fabric after sizing treatment;

and S2, carrying out ink-jet printing on the acrylic fabric treated in the step S1 by adopting cationic dye ink, and then carrying out steaming and washing treatment.

In the step S1, the acrylic fabric is subjected to sizing treatment by using any one of the pre-printing treatment pastes provided in the first aspect of the present invention, specifically, for the pre-printing treatment paste with viscosity less than 1200mPa · S, a dipping and pressing type sizing machine can be used to perform sizing treatment on the fabric; for the pre-printing treatment slurry having a viscosity of 1200mPa · s or more, the textile may be subjected to sizing treatment using any one of a dip press type sizing machine, a cylinder printing machine, or a flat screen printing machine. For example, the acrylic fabric may be dipped into the pre-printing treatment slurry and then rolled by a roll-to-roll sizing machine. The fabric is kept flat during the rolling process, so that no folds are formed to influence the ink-jet printing effect. The temperature of the drying treatment is generally 60-80 ℃, and the time is generally controlled for 2-5 min. The drying process is used for removing moisture so as to facilitate subsequent printing and prevent the printed patterns from blooming or feathering due to capillary action in the printing process.

In step S2, after the inkjet printing is completed, the acrylic fabric may be baked and then steamed; the temperature of the baking treatment is generally 35-45 ℃, and the time is controlled within 3-5 min. In the steaming process, the temperature is generally controlled to be 85-95 ℃, the steam pressure is controlled to be 0.3-0.4 MPa, and the time is controlled to be 20-50 min. The washing treatment may include water washing and soaping with a cationic anti-staining soaping agent. Specifically, washing the mixture for 2-3 times by adopting water at 40-60 ℃; then, soaping for 5-10 min at 50-70 ℃ by using a cation anti-sticking soaping agent with the concentration of 1-2 g/L, and finally washing by using cold water.

The fourth aspect of the invention provides a textile which is prepared by any one of the acrylic fabric inkjet printing processes provided by the third aspect of the invention.

The embodiment of the invention has the beneficial effects that:

the embodiment of the invention provides printing pretreatment slurry, which can be used for pretreatment (namely sizing treatment) of ink-jet printing of cationic dye ink of acrylic fabric, wherein the cationic paste is added to prevent the cationic dye ink of ink-jet printing on the acrylic fabric from being infiltrated or penetrated due to capillary action so as to influence the definition, sharpness, color saturation and the like of a printed pattern; the cosolvent can be beneficial to dissolving the cationic dye, and can absorb moisture in the steaming process of the ink-jet printing process, so that a solution environment is provided for dyeing the cationic dye ink on the acrylic fabric; the pH buffering agent provides an acidic environment for the cationic dye ink to dye; the addition of the electrolyte can be beneficial to dyeing the cationic dye ink on the acrylic fabric, the thickening agent can play a thickening effect, and the fumed silica can also reduce the layering of a slurry system and form a net structure after the sizing and drying on the surface of the fabric, so that the capillary phenomenon on the surface of the fabric is reduced; the slow dyeing agent can play a role in slow dyeing, so that the color of the steamed pattern is uniform. By adopting the matching and combination of the raw materials, the prepared printing pretreatment slurry is used for the pretreatment of the ink-jet printing of the cationic dye ink of the acrylic fabric, so that the dyeing step is simple and controllable, and the pattern of a sample obtained by ink-jet printing has clear outline, bright color and good color fastness; and can realize the small batch, diversification and individuation of production.

Detailed Description

The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.