CN111472184B - Dispersed digital printing primer and preparation method thereof - Google Patents
Dispersed digital printing primer and preparation method thereof Download PDFInfo
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- CN111472184B CN111472184B CN202010370200.1A CN202010370200A CN111472184B CN 111472184 B CN111472184 B CN 111472184B CN 202010370200 A CN202010370200 A CN 202010370200A CN 111472184 B CN111472184 B CN 111472184B
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- 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
- D06P1/46—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 natural macromolecular substances or derivatives thereof
- D06P1/48—Derivatives of carbohydrates
- D06P1/50—Derivatives of cellulose
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- 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
- D06P1/445—Use of auxiliary substances before, during or after dyeing or printing
-
- 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
- D06P1/46—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 natural macromolecular substances or derivatives thereof
-
- 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
- D06P1/46—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 natural macromolecular substances or derivatives thereof
- D06P1/48—Derivatives of carbohydrates
-
- 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
- D06P1/65106—Oxygen-containing compounds
- D06P1/65118—Compounds containing hydroxyl groups
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- 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
- D06P1/65106—Oxygen-containing compounds
- D06P1/65131—Compounds containing ether or acetal groups
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- 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
- D06P1/65187—Compounds containing sulfide or disulfide groups
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- 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
- D06P3/34—Material containing ester groups
- D06P3/52—Polyesters
- D06P3/54—Polyesters using dispersed dyestuffs
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- 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
- D06P5/002—Locally enhancing dye affinity of a textile material by chemical means
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- 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
- D06P5/02—After-treatment
- D06P5/10—After-treatment with compounds containing metal
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a dispersed digital printing base paste and a preparation method thereof, wherein the digital printing base paste comprises the following components in percentage by weight: 1-6% of thickening agent, 5-15% of cosolvent, 1-6% of alkyl glycoside, 0.5-5% of alkaline agent and 70-90% of water; the thickening agent comprises hydroxyethyl cellulose, sclerotium rolfsii gum and locust bean gum, wherein the weight ratio of the sclerotium rolfsii gum to the locust bean gum to the hydroxyethyl cellulose is 0.5-3: 1. According to the invention, hydroxyethyl cellulose, sclerotium rolfsii gum and locust bean gum are compounded to be used as the thickening agent, so that the color supply of the disperse digital primer is obviously improved, the K/S value is higher, the printing profile is clear, the leveling property is good, and the bleeding rate is good. The printed fabric obtained by the treatment of the dispersed digital printing paste has brighter printing color, fuller pattern and color fastness reaching 4-5 grades compared with the fabric prepared by the common process because the color quantity is improved.
Description
Technical Field
The invention relates to the technical field of digital printing, in particular to a dispersed digital printing base paste and a preparation method thereof.
Background
Digital printing is printing by digital technology. The digital printing technology is a high and new technology product which integrates the mechanical and computer electronic information technology into a whole and is gradually formed along with the continuous development of the computer technology. The digital printing process flow mainly comprises three parts: fabric pretreatment, ink-jet printing and post-printing treatment; the pretreatment of the fabric comprises the steps of preparing slurry, sizing the fabric, tentering, drying and sealing for storage, wherein the digital printing slurry is applied to the pretreatment, more than 50% of the printing ink in China at present is disperse dye ink and is used for printing chemical fabrics such as polyester fibers; disperse dyes are nonionic dyes which have very low water solubility and are present in the form of fine particles which are predominantly highly dispersed in water by the action of dispersants during dyeing. The disperse dye has small molecular weight, simple chemical structure, no water-soluble group and stronger hydrophobicity, and is a nonionic dye, so the disperse dye is commonly used for dyeing terylene.
The dispersed digital printing bottom slurry in the prior art comprises synthetic paste, urea and the like. The printing paste plays a thickening role in the sizing agent, the existing printing paste mainly comprises high molecular paste such as sodium alginate, starch and the like, wherein the sodium alginate paste has good permeability and good printing hand feeling, but the sodium alginate has high cost and less supply; the starch has low price, but poor permeability and hand feeling; the existing digital printing base paste has a single function, and the single digital printing base paste cannot meet the requirements of an actual printing process along with the continuous improvement of the current printing and dyeing technology; there is a need for improvements to conventional primer slurries to meet existing market demands.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the disperse digital printing primer and the preparation method thereof.
In order to realize the purpose, the invention adopts the technical scheme that: a disperse digital printing base paste comprises the following components in percentage by weight: 1-6% of thickening agent, 5-15% of cosolvent, 1-6% of alkyl glycoside, 0.5-5% of alkaline agent and 70-90% of water; the thickening agent comprises hydroxyethyl cellulose, sclerotium rolfsii gum and locust bean gum, wherein the weight ratio of the sclerotium rolfsii gum to the locust bean gum to the hydroxyethyl cellulose is as follows: 0.5-3: 1 of locust bean gum.
Furthermore, the digital printing primer slurry comprises the following components in percentage by weight: 4-6% of thickening agent, 5-10% of cosolvent, 2-6% of alkyl glycoside, 1-5% of alkaline agent and 75-90% of water.
The thickener replaces the existing sodium alginate, and the sclerotium rolfsii gum, the locust bean gum and the hydroxyethyl cellulose are compounded, so that the sclerotium rolfsii gum and the locust bean gum have the advantages of good chemical water retention, good stability, high pasting rate, good fluidity and stability, good dispersibility of the hydroxyethyl cellulose and good stability. Surprisingly, the disperse digital bottom pulp prepared by compounding the sclerotinia sclerotiorum gum, the locust bean gum and the hydroxyethyl cellulose as the thickening agent has the advantages of remarkably higher color yield than that prepared by adopting the conventional thickening agent (such as sodium alginate), high K/S value, clear printing contour, good leveling property and good permeability. Due to the improvement of the color supply amount, compared with the fabric prepared by the common process, the printed fabric obtained by the treatment of the dispersed digital printing sizing agent has brighter printing color and plump pattern.
As a preferred embodiment of the disperse digital printing base stock of the present invention, the weight ratio of the sclerotium rolfsii gum, the locust bean gum and the hydroxyethyl cellulose is sclerotium rolfsii gum: locust bean gum: the carboxyethylcellulose is 1-2: 1. The inventor finds that when the sclerotium rolfsii gum, the locust bean gum and the hydroxyethyl cellulose are compounded according to the proportion, the K/S value and the infiltration rate capability are better.
As a preferred embodiment of the disperse digital printing base stock of the present invention, the weight ratio of the sclerotium rolfsii gum, the locust bean gum and the hydroxyethyl cellulose is sclerotium rolfsii gum: locust bean gum: hydroxyethyl cellulose ═ 1.5:1.5: 1. When the sclerotium rolfsii gum, the locust bean gum and the hydroxyethyl cellulose are compounded according to the specific proportion, the effect is most obvious.
As a preferred embodiment of the digital printing base paste of the present invention, the alkali agent is at least one of sodium carbonate and sodium trichloroacetate. Preferably, the alkaline agent is a compound consisting of sodium carbonate and sodium trichloroacetate in a weight ratio of 1: 0.8.
As a preferred embodiment of the disperse digital printing base paste of the present invention, the weight ratio of the alkyl glycoside to the alkaline agent is alkyl glycoside: 1-1.6: 1, further, alkyl glycoside: the alkaline agent is 1.6:1, and the adhesion of the dye to the fiber and the color fastness can be improved when the ratio of the alkaline agent to the fiber is within the range.
As a preferred embodiment of the disperse digital printing base stock according to the invention, the weight ratio of alkyl glycoside to hydroxyethyl cellulose is alkyl glycoside: hydroxyethyl cellulose is 1-2: 1. Further, alkyl glycoside: hydroxyethyl cellulose ═ 2: 1. The alkyl glycoside and the hydroxyethyl cellulose are compounded in a specific proportion, have a synergistic effect, and can further improve the anti-wrinkle performance of the fabric.
As a preferred embodiment of the disperse digital printing base paste of the present invention, the cosolvent is a mixture of diethylene glycol ether and thiodiglycol. And the weight ratio of the diethylene glycol ether to the thiodiglycol is diethylene glycol ether: thiodiglycol is 1-2: 1.
The invention also provides a preparation method of the dispersed digital printing primer slurry, which comprises the following steps:
1) uniformly mixing hydroxyethyl cellulose, sclerotium rolfsii gum and locust bean gum, adding the mixture into water at the temperature of 50-60 ℃, uniformly stirring, and standing to obtain a thickener solution;
2) sequentially adding an alkaline agent, alkyl glycoside and a cosolvent into the thickening agent to obtain a semi-finished printing base paste;
3) and adding water, and uniformly stirring to obtain the dispersed digital printing bottom paste.
The invention has the beneficial effects that:
1) the invention creatively compounds the sclerotinia sclerotiorum gum, the locust bean gum and the hydroxyethyl cellulose to be used as the thickening agent, the color yield of the prepared dispersed digital bottom pulp is obviously higher than that of the prior thickening agent (such as sodium alginate), the K/S value is high, and more importantly, the printing profile is clear, the leveling property is good, and the permeability is good. Due to the improvement of the color supply, compared with the fabric prepared by the common process, the printed fabric obtained by the treatment of the dispersed digital printing slurry has brighter printing color, fuller pattern and color fastness reaching 4-5 grades.
2) The invention can improve the adhesion of dye to fiber, improve color fastness, promote the color fixing ability of alkali agent, and obtain 4-5 grades of rubbing color fastness and soaping color fastness by limiting the weight ratio of alkyl glycoside to alkali agent.
3) The invention can improve the anti-wrinkle performance of the fabric by limiting the proportion of the alkyl glycoside to the hydroxyethyl cellulose, and the recovery angle can reach 232 degrees at most.
Detailed Description
To better illustrate the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to specific examples.
TABLE 1 formulas of the digital printing base pastes for the Dispersion of inventive examples 1-5 and control
The preparation method of the reactive digital printing primer paste in the embodiment 1-5 comprises the following steps:
1) uniformly mixing hydroxyethyl cellulose, sclerotium rolfsii gum and locust bean gum, adding water with the temperature of 60 ℃, uniformly stirring, and standing to obtain a thickening agent solution;
2) sequentially adding an alkaline agent, alkyl glycoside and a cosolvent into the thickening agent to obtain a semi-finished printing base paste;
3) and adding water, and uniformly stirring to obtain the dispersed digital printing bottom paste.
The alkaline agent of the embodiment and the comparative example consists of sodium carbonate and sodium trichloroacetate according to the weight ratio of 1: 0.8; the cosolvent consists of diethylene glycol ether and thiodiglycol in a weight ratio of 2: 1.
Comparative examples 1 to 5
The thickener is prepared according to the formula shown in the table 2, wherein the types of the thickener, the proportion of alkyl glycoside to hydroxyethyl cellulose, and the weight percentage of the alkyl glycoside to the alkali agent are respectively changed to obtain comparative examples 1-5 based on the formula shown in the example 1.
Table 2 formula of comparative examples 1 to 5 dispersed digital printing base paste
Performance testing
Drying the polyester fabric subjected to the printing base stock pretreatment in the embodiments 1-5 and the comparative examples 1-5, baking the fabric at 180 ℃ for 5min, then washing with cold water, washing with alkaline water at 100 ℃ for 3min, washing with hot water at 85 ℃, washing with cold water, neutralizing and drying to obtain the printed polyester fabric.
(I) test of print fastness
1. Testing the rubbing color fastness of the fabric:
according to the requirements of GB/T3920-.
The crocking fastness was assessed according to GB251-1995 Grey sample card for assessment of staining.
2. Testing the soaping color fastness of the fabric:
and (3) carrying out soaping color fastness test on the sample according to the requirements of GB/T3921.1-2008 'textile color fastness test and soaping color fastness'.
Soaping fastness was assessed according to GB250-1995 Grey sample card for assessing discoloration.
The control group used a commercial disperse digital printing paste.
Measurement of K/S value
And (4) measuring the COLOR yield, namely measuring the K/S value of the wool fabric by using a COLOR-Eye 7000A computer COLOR measuring and matching instrument. The larger the K/S value, the darker the color.
(III) PVI
The viscosity of the standard digital printing paste is tested by an NDJ-1 rotary viscometer at the temperature of 25 ℃.
(IV) Water Retention Rate
Taking 100g of prepared slurry, placing the slurry in a constant humidity box with the temperature of 25 ℃ and the humidity of 65-75% for 24h, then weighing the mass of the residual slurry, and expressing the percentage of the residual slurry in the weight of the initial slurry by adopting the water retention rate, wherein the higher the water retention rate is, the better the water retention performance is;
(V) Dry anti-wrinkle recovery Angle
The dry state crease-resistant recovery angle is measured according to the vertical method in GB/T3819 < determination of crease recovery of textile fabrics >, and the larger the recovery angle is, the better the crease resistance of the textile is expressed by the warp direction and the weft direction.
The test results are shown in table 3 below:
TABLE 3 test results of crocking color fastness, soaping color fastness, K/S value
| Test sample | Colour fastness to rubbing | Color fastness to soaping | K/S value |
| Example 1 | 4-5 | 4-5 | 17.74±3.05 |
| Example 2 | 4 | 4-5 | 16.97±1.62 |
| Example 3 | 4 | 4 | 17.01±1.58 |
| Example 4 | 4 | 4 | 15.53±2.27 |
| Example 5 | 4 | 4 | 15.27±1.39 |
| Comparative example 1 | 3 | 4 | 13.42±2.41* |
| Comparative example 2 | 3 | 3 | 10.38±2.06** |
| Comparative example 3 | 3 | 3 | 11.35±1.74** |
| Comparative example 4 | 4 | 4 | 14.48±2.33 |
| Comparative example 5 | 2 | 2 | 15.27±1.61 |
| Control group | 4-5 | 4 | 17.53±2.20 |
Note: in comparison with the group of example 1,*P＜0.05；**P＜0.01。
TABLE 4PVI value, Water Retention Rate and Dry anti-wrinkle Return Angle test results
As can be seen from tables 3 to 4: compared with the common printed fabric obtained by treating the polyester fabric with the dispersed digital printing primer prepared in the embodiments 1-5, the printed fabric obtained by treating the polyester fabric has the advantages of higher K/S value, more bright printing color, color fastness reaching 4-5 level, stronger coloring capability, better water retention performance and better crease resistance.
Comparing the results of comparative examples 1 to 3, it can be seen that when the type of the thickener is changed, the change of the K/S value is significantly influenced, compared with the group of example 1, the change has significant difference, the color fastness and PVI influence are not large, and when three components of sclerotium rolfsii gum, locust bean gum and hydroxyethyl cellulose are used together, the use of one or two components is significantly better.
Comparing the results of comparative example 4, it can be known that the alkyl glycoside and the hydroxyethyl cellulose have the anti-wrinkle synergistic effect, and the anti-wrinkle performance of the fabric can be further improved by compounding the alkyl glycoside and the hydroxyethyl cellulose at a specific ratio.
Comparing the results of comparative example 5, it is known that the alkyl glycoside can improve the adhesion of the dye to the fiber and improve the color fastness, and that the color fastness is stronger and the color yield is darker when the weight ratio of the alkyl glycoside to the alkaline agent is 1.6: 1.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. The disperse digital printing base paste is characterized by comprising the following components in percentage by weight: 1-6% of thickening agent, 5-15% of cosolvent, 1-6% of alkyl glycoside, 0.5-5% of alkaline agent and 70-90% of water; the thickening agent is a mixture of sclerotium rolfsii gum, locust bean gum and hydroxyethyl cellulose in a weight ratio of 0.5-3: 1;
the alkaline agent is a mixture consisting of sodium carbonate and sodium trichloroacetate;
the weight ratio of the alkyl glycoside to the alkaline agent is alkyl glycoside: alkaline agent = 1-1.6: 1;
the weight ratio of the alkyl glycoside to the hydroxyethyl cellulose is alkyl glycoside: hydroxyethyl cellulose = 1-2: 1;
the cosolvent is a mixture of diethylene glycol ether and thiodiglycol.
2. A digital printing paste according to claim 1, wherein the digital printing paste comprises the following components in percentage by weight: 4-6% of thickening agent, 5-10% of cosolvent, 2-6% of alkyl glycoside, 1-5% of alkaline agent and 75-90% of water.
3. A digital printing paste according to claim 1, wherein the weight ratio of sclerotium rolfsii gum, locust bean gum and hydroxyethyl cellulose is sclerotium rolfsii gum: locust bean gum: hydroxyethyl cellulose = 1-2: 1.
4. A digital printing paste according to claim 3, wherein the weight ratio of sclerotium rolfsii gum, locust bean gum and hydroxyethyl cellulose is sclerotium rolfsii gum: locust bean gum: hydroxyethyl cellulose = 1.5:1.5: 1.
5. A method for preparing a disperse digital printing primer according to any one of claims 1 to 4, comprising the steps of:
1) uniformly mixing hydroxyethyl cellulose, sclerotium rolfsii gum and locust bean gum, adding the mixture into water at the temperature of 50-60 ℃, uniformly stirring, and standing to obtain a thickener solution;
2) sequentially adding an alkaline agent, alkyl glycoside and a cosolvent into the thickening agent to obtain a semi-finished printing base paste;
3) and adding water, and uniformly stirring to obtain the dispersed digital printing bottom paste.
6. Use of a disperse digital printing primer according to any one of claims 1 to 4 in a printing process.
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