Non-ionic cellulose active digital printing pretreatment slurry and preparation method thereof

Abstract

The invention discloses nonionic cellulose active digital printing pretreatment slurry and a preparation method thereof. The pretreatment slurry is prepared from the following raw materials in percentage by weight: 1-5% of hydroxyethyl methyl cellulose, 0.5-3.6% of carboxymethyl methyl cellulose, 1-2.7% of a nonionic thickening agent, 5-10% of a moisture absorbent, 1.2-3% of an alkaline agent and the balance of water. The prepared pretreatment slurry is good in stability and can be used for preparing digital printing fabric with color yield, permeability and high printing precision, and high market requirements are met.

Description

Technical Field

[0001] The present invention relates to the technical field of digital printing, and more specifically, to a non-ionic cellulose active digital printing pre-treatment slurry and a preparation method thereof. Background Art

[0002] Reactive dyes, also known as reactive dyes, contain one or more active groups in the molecule. Under appropriate conditions, they can react with hydroxyl groups on cellulose fibers and amino groups on protein fibers to form covalent bonds. They are suitable for dyeing and printing of textiles such as cotton, rayon, and silk. However, digital printing with reactive dyes cannot directly add the auxiliaries used for printing to the dye ink. Sizing pretreatment is required before digital printing of fabrics. In current technology, most of the pre-treatment slurries for reactive digital printing come from traditional reactive printing pastes such as sodium alginate, modified starch, and starch. Such slurries are prone to cause problems such as light color and low printing accuracy of printed fabrics during digital printing, which reduces the product grade and added value. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a non-ionic cellulose active digital printing pretreatment slurry and a preparation method thereof. The obtained pretreatment slurry has good stability and can be used to prepare digital printing fabrics with color acquisition, permeability and high printing precision to meet the high market demand.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A nonionic cellulose active digital printing pretreatment slurry is composed of the following raw materials in percentage by weight: 1-5% hydroxyethyl methyl cellulose, 0.5-3.6% carboxymethyl methyl cellulose, 1-2.7% nonionic thickener, 5-10% moisture absorbent, 1.2-3% alkali agent, and the balance is water.

[0006] The nonionic thickener is MB-ZC thickener.

[0007] The desiccant is at least one of urea, glycerol, ethylene glycol and Polygonatum odoratum polysaccharide. The desiccant is preferably a mixture of Polygonatum odoratum polysaccharide and urea in a mass ratio of 3:1.

[0008] The alkaline agent is one of sodium bicarbonate and sodium carbonate.

[0009] The pre-treated slurry is composed of the following raw materials in percentage by weight: 3.9% of hydroxyethyl methyl cellulose, 2.8% of carboxymethyl methyl cellulose, 2.5% of MB-ZC thickener, 8.4% of moisture absorbent, 1.7% of alkali agent, and the balance is water.

[0010] A method for preparing the non-ionic cellulose active digital printing pretreatment slurry as described above comprises the following steps: dissolving a hygroscopic agent and an alkali agent in water at 30-40° C., then sequentially adding hydroxyethyl methyl cellulose, carboxymethyl methyl cellulose and a thickener while stirring, and obtaining the non-ionic cellulose active digital printing pretreatment slurry after stirring evenly.

[0011] The beneficial effects of the present invention are:

[0012] The present invention obtains a nonionic cellulose type active digital printing pretreatment slurry with good color, high printing precision and good stability through reasonable compounding of hydroxyethyl methyl cellulose, carboxymethyl methyl cellulose, a nonionic thickener, a hygroscopic agent and an alkali agent. In particular, when MB-ZC thickener is used as a thickener and Polygonatum odoratum polysaccharide and a urea composition are used as hygroscopic agents for compounding, the three can effectively exert a synergistic effect, further improve the slurry stability and printing precision, and meet higher market demands. DETAILED DESCRIPTION

[0013] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0014] The nonionic cellulose active digital printing pretreatment slurry of the present invention is composed of the following raw materials in percentage by weight: 1-5% hydroxyethyl methyl cellulose (HEMC), 0.5-3.6% carboxymethyl methyl cellulose (CMMC), 1-2.7% nonionic thickener, 5-10% hygroscopic agent, 1.2-3% alkali agent, and the balance is water. Among them, the thickener is MB-ZC thickener (purchased from Meiba Biotechnology Co., Ltd.); the hygroscopic agent is at least one of urea, glycerol, ethylene glycol, and polygonatum odoratum polysaccharide, preferably a mixture of polygonatum odoratum polysaccharide and urea in a mass ratio of 3:1; the alkali agent is one of sodium bicarbonate and sodium carbonate. At 30-40°C, the hygroscopic agent and the alkali agent are stirred and dissolved in water, and then hydroxyethyl methyl cellulose, carboxymethyl methyl cellulose and the thickener are added in sequence while stirring, and the nonionic cellulose active digital printing pretreatment slurry can be obtained after stirring evenly.

[0015] Example 1

[0016] (1) Prepare the following non-ionic cellulose active digital printing pretreatment slurry raw materials in the following weight percentages: 3.9% hydroxyethyl methyl cellulose, 2.8% carboxymethyl methyl cellulose, 2.5% MB-ZC thickener, 8.4% urea, 1.7% sodium bicarbonate, and the balance is water.

[0017] (2) At 35° C., urea and sodium bicarbonate were stirred and dissolved in water, and then hydroxyethyl methyl cellulose, carboxymethyl methyl cellulose and MB-ZC thickener were added in sequence while stirring, and the non-ionic cellulose active digital printing pretreatment slurry was obtained after stirring evenly.

[0018] Example 2

[0019] (1) Prepare the following non-ionic cellulose active digital printing pretreatment slurry raw materials in percentage by weight: 3.9% hydroxyethyl methyl cellulose, 2.8% carboxymethyl methyl cellulose, 2.5% MB-ZC thickener, 6.3% glycerol, 2.1% urea, 1.7% sodium bicarbonate, and the balance is water.

[0020] (2) At 35° C., propylene glycol, urea, and sodium bicarbonate were stirred and dissolved in water, and then hydroxyethyl methyl cellulose, carboxymethyl methyl cellulose, and MB-ZC thickener were added in sequence while stirring, and the non-ionic cellulose active digital printing pretreatment slurry was obtained after stirring evenly.

[0021] Example 3

[0022] (1) Prepare the following non-ionic cellulose active digital printing pretreatment slurry raw materials in percentage by weight: 3.9% hydroxyethyl methyl cellulose, 2.8% carboxymethyl methyl cellulose, 2.5% MB-ZC thickener, 6.3% ethylene glycol, 2.1% urea, 1.7% sodium bicarbonate, and the balance is water.

[0023] (2) At 35° C., ethylene glycol, urea, and sodium bicarbonate are stirred and dissolved in water, and then hydroxyethyl methyl cellulose, carboxymethyl methyl cellulose, and MB-ZC thickener are added in sequence while stirring, and after stirring evenly, a non-ionic cellulose active digital printing pretreatment slurry is obtained.

[0024] Example 4

[0025] (1) Prepare the following non-ionic cellulose active digital printing pre-treatment slurry raw materials in the following weight percentages: 3.9% hydroxyethyl methyl cellulose, 2.8% carboxymethyl methyl cellulose, 2.5% MB-ZC thickener, 8.4% Polygonatum odoratum polysaccharide, 1.7% sodium bicarbonate, and the balance is water.

[0026] (2) Polygonatum odoratum polysaccharide, urea and sodium bicarbonate were stirred and dissolved in water at 35°C, and then hydroxyethyl methyl cellulose, carboxymethyl methyl cellulose and MB-ZC thickener were added in sequence while stirring, and the non-ionic cellulose active digital printing pretreatment slurry was obtained after stirring evenly.

[0027] Example 5

[0028] (1) Prepare the following non-ionic cellulose active digital printing pretreatment slurry raw materials in the following weight percentages: 3.9% hydroxyethyl methyl cellulose, 2.8% carboxymethyl methyl cellulose, 2.5% MB-ZC thickener, 6.3% Polygonatum odoratum polysaccharide, 2.1% urea, 1.7% sodium bicarbonate, and the balance is water.

[0029] (2) Polygonatum odoratum polysaccharide, urea and sodium bicarbonate were stirred and dissolved in water at 35°C, and then hydroxyethyl methyl cellulose, carboxymethyl methyl cellulose and MB-ZC thickener were added in sequence while stirring, and the non-ionic cellulose active digital printing pretreatment slurry was obtained after stirring evenly.

[0030] Comparative Example 1

[0031] The reactive digital printing pretreatment slurry was prepared according to the method of Example 4, except that the MB-ZC thickener was replaced by polyethylene glycol.

[0032] The reactive digital printing pretreatment slurry prepared in Examples 1-5 and Comparative Example 1 was used for knitted fabric printing (using conventional printing process: padding pretreatment working solution (sizing, one dip and one padding, padding rate 92%) → reactive digital printing (taking reactive brilliant blue KN-R as an example, the content of reactive brilliant blue KN-R in the color paste is 4%) → drying → steaming (103°C × 8min) → cold water washing → warm water washing (80°C) → soap washing (95°C) → drying). The performance test results are shown in the following table:

[0033]

[0034] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A non-ionic cellulose active digital printing pre-treatment slurry, characterized in that: The pre-treated slurry is composed of the following raw materials in percentage by weight: 1-5% of hydroxyethyl methyl cellulose, 0.5-3.6% of carboxymethyl methyl cellulose, 1-2.7% of nonionic thickener, 5-10% of moisture absorbent, 1.2-3% of alkali agent, and the balance is water.

2. The nonionic cellulose active digital printing pretreatment slurry according to claim 1, characterized in that: The nonionic thickener is MB-ZC thickener.

3. The nonionic cellulose active digital printing pretreatment slurry according to claim 1, characterized in that: The moisture absorbent is at least one of urea, glycerol, ethylene glycol and polygonatum odoratum polysaccharide.

4. The nonionic cellulose active digital printing pretreatment slurry according to claim 1, characterized in that: The moisture absorbent is a mixture of polygonatum odoratum polysaccharide and urea in a mass ratio of 3:

1.

5. The non-ionic cellulose active digital printing pretreatment slurry according to claim 1, characterized in that: The alkaline agent is one of sodium bicarbonate and sodium carbonate.

6. The nonionic cellulose active digital printing pretreatment slurry according to claim 1, characterized in that: The pre-treated slurry is composed of the following raw materials in percentage by weight: 3.9% of hydroxyethyl methyl cellulose, 2.8% of carboxymethyl methyl cellulose, 2.5% of MB-ZC thickener, 8.4% of moisture absorbent, 1.7% of alkali agent, and the balance is water.

7. A method for preparing the non-ionic cellulose active digital printing pre-treatment slurry according to any one of claims 1 to 6, characterized in that: At 30-40° C., the desiccant and the alkali agent are stirred and dissolved in water, and then hydroxyethyl methyl cellulose, carboxymethyl methyl cellulose and a thickener are added in sequence while stirring, and the non-ionic cellulose active digital printing pretreatment slurry is obtained after stirring evenly.

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