Application of chitin in improvement of printing fastness in coating digital printing

Abstract

The invention relates to the technical field of coating digital printing, in particular to application of chitin to improvement of printing fastness in coating digital printing, which comprises the following steps: mixing an adhesive, a thickening agent and chitin to form a mixture; mixing the formed mixture with a curing agent, a humectant, water, a coating and chitin through an ultrasonic dissolution method to form a coating ink-jet printing paste, injecting the coating ink-jet printing paste into the surface and the interior of a fabric to achieve a printing effect, padding or spraying a chitin solution onto the printed fabric, and then neutralizing by alkali to obtain the coating ink-jet printing fabric. According to the invention, chitin is added into pigment printing, so that the chitin is firmly reacted in the pigment printing, the firm combination among objects is solved by adopting chitin substances with positive structures and bonding effects, and the chitin has natural polymer polysaccharide substances with positive charges and contains a large number of groups, so that the affinity among coatings, adhesives and fiber fabrics can be increased; and the fastness between the components is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of paint digital printing, and in particular to the application of chitosan in paint digital printing to improve printing fastness. Background Art

[0002] As we all know, paint printing is a traditional printing method with simple method, intuitive color expression, short process flow, strong expressiveness and easy operation. It is widely used in fabric printing. Since the advent of digital printing, paint has been the first choice for digital printing coloring raw materials.

[0003] Digital printing is a new type of digital integrated coding inkjet printing method. The pattern and color are digitally designed and programmed, and the dye is injected into the surface and interior of the fabric through mechanical jetting to achieve the traditional printing results, so it is called digital printing.

[0004] Factors that affect the fastness of digital coating printing; sizing agent before printing, adhesive in coating slurry, adhesive, wet friction fastness enhancer, etc. The common characteristic of these factors is to solve the color fastness through bonding.

[0005] Paint is a chemical synthetic substance, also known as pigment. It is non-ionic and has no solubility in water. It is very difficult to combine it firmly with water.

[0006] Adhesives are also chemically synthesized (generally made of acrylic acid and acrylonitrile). Although adhesives have good adhesion to coatings, due to the good hydrophilicity of adhesives, the adhesion between coatings and adhesives is reduced during soaping tests (high temperature soaping) or friction tests (dry friction, wet friction) during inspection, resulting in the separation of coating color and poor fastness. Therefore, it is necessary to propose a solution to this technical problem. Summary of the Invention

[0007] (1) Technical problems solved

[0008] In view of the shortcomings of the existing technology, the present invention provides the application of chitosan in coating digital printing to improve printing fastness.

[0009] (2) Technical solution

[0010] To achieve the above object, the present invention provides the following technical solution: an application formula of chitin for improving printing fastness in paint digital printing, comprising a paint inkjet printing slurry and chitin, wherein the formula of the paint inkjet printing slurry comprises:

[0011] 0.5-5% coating;

[0012] 20-30% adhesive;

[0013] 1-3% thickener;

[0014] 2-3% curing agent;

[0015] 1.5% moisturizer;

[0016] 74-59% water.

[0017] Furthermore, the present invention is improved in that the chitosan contains natural high molecular weight polysaccharide substances, hydroxyl groups, acetylamino groups, amino groups, ketones, pyrroles, furans and pyridines.

[0018] Furthermore, the present invention is improved in that the coating is a chemically non-reactive pigment.

[0019] Furthermore, the present invention is improved in that the application formula of chitosan for improving printing fastness in paint digital printing is used for application in paint digital printing.

[0020] The present invention also provides a formulation process for applying chitin to improve printing fastness in paint digital printing, comprising a paint inkjet printing slurry and chitin, wherein the chitin dosage ranges from 15 to 30 grams per liter, and the formulation of the paint inkjet printing slurry comprises 0.5 to 5% of paint, 20 to 30% of adhesive, 1 to 3% of thickener, 2 to 3% of curing agent, 1.5% of moisturizer, and 74 to 59% of water. The process comprises the following steps:

[0021] Step 1: Mix the binder, thickener and chitin to form a mixture;

[0022] Step 2: mixing the mixture formed in step 1 with a curing agent, a moisturizing agent, water, a coating and chitin by an ultrasonic dissolution method to form a coating inkjet printing slurry;

[0023] Step 3: Inject the coating inkjet printing slurry into the surface and interior of the fabric to achieve the printing effect;

[0024] Step 4: Dip or spray the chitosan solution onto the printed fabric, and then neutralize it with alkali to make the chitosan react firmly in the pigment printing.

[0025] (3) Beneficial effects

[0026] Compared with the prior art, the present invention provides an application of chitosan in coating digital printing to improve printing fastness, which has the following beneficial effects:

[0027] The application of chitin in digital printing of coatings to improve printing fastness uses chitin-like substances with positive structures and adhesive effects to solve the problem of strong bonding between objects. Chitin is a natural high-molecular polysaccharide with positive charge. It contains a variety of large groups that can increase the affinity between coatings, adhesives, and fiber fabrics, thereby improving their fastness.

[0028] In order to achieve a comprehensive and sufficient combination between the paint and the fiber, the ultrasonic dissolution method is used to quickly and fully dissolve the substances, so that the substances can be combined in a fully dispersed state. The chitosan solution is dipped or sprayed onto the printed fabric, and then neutralized with alkali to make the chitosan firmly react and fix in the paint printing pattern. The water washing fastness is very high, which also improves the printing fastness. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the device for mixing digital printing paint paste and chitin according to the present invention;

[0030] Figure 2 Schematic diagram of the digital printing adhesive and chitin mixing device of the present invention. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 efforts are within the scope of protection of the present invention.

[0032] See also Figure 1-2 The present invention is an application formula of chitin in coating digital printing to improve printing fastness, comprising a coating inkjet printing slurry and chitin, wherein the formula of the coating inkjet printing slurry comprises:

[0033] 0.5-5% coating;

[0034] 20-30% adhesive;

[0035] 1-3% thickener;

[0036] 2-3% curing agent;

[0037] 1.5% moisturizer;

[0038] 74-59% water.

[0039] In this solution, the chitosan contains natural high molecular weight polysaccharide substances, hydroxyl groups, acetylamino groups, amino groups, ketones, pyrroles, furans and pyridines.

[0040] In this solution, the coating is a chemically non-reactive pigment.

[0041] In this solution, the chitosan application formula for improving printing fastness in paint digital printing is used for the application of paint digital printing.

[0042] The present invention also provides a formulation process for applying chitin to improve printing fastness in paint digital printing, comprising a paint inkjet printing slurry and chitin, wherein the chitin dosage ranges from 15 to 30 grams per liter, and the formulation of the paint inkjet printing slurry comprises 0.5 to 5% of paint, 20 to 30% of adhesive, 1 to 3% of thickener, 2 to 3% of curing agent, 1.5% of moisturizer, and 74 to 59% of water. The process comprises the following steps:

[0043] Step 1: Mix the binder, thickener and hyperthyroidism to form a mixture;

[0044] Step 2: mixing the mixture formed in step 1 with a curing agent, a moisturizing agent, water, a coating and chitin by an ultrasonic dissolution method to form a coating inkjet printing slurry;

[0045] Step 3: Inject the coating inkjet printing slurry into the surface and interior of the fabric to achieve the printing effect;

[0046] Step 4: Dip or spray the chitosan solution onto the printed fabric, and then neutralize it with alkali to make the chitosan firmly react and fix in the pigment printing.

[0047] In this embodiment, an adhesive, a thickener and chitosan are mixed to form a mixture, the mixture is mixed with a curing agent, a moisturizing agent, water, a coating and chitosan by an ultrasonic dissolution method to form a coating inkjet printing slurry, the coating inkjet printing slurry is injected into the surface or interior of the fabric to achieve a printing effect, the chitosan solution is rolled or sprayed onto the printed fabric, and then neutralized with an alkali to make the chitosan react firmly in the coating printing, and chitosan is used as a material with a positive structure and an adhesive effect to solve the problem of firm bonding between objects. Chitosan has a natural high molecular weight polysaccharide with a positive charge and contains a variety of large groups (hydroxyl, acetylamino, amino, ketone, pyrrole, furan, pyridine). These groups can increase the affinity between the coating, adhesive and fiber fabric, and improve their affinity. The most important thing about the fastness is that chitosan is insoluble in water, alcohol and other solvents. When water-insoluble substances are introduced into the surface, the shedding and peeling of the coating will be reduced when soaping or wet rubbing, thereby improving the fastness. In order to make the coating and the fiber fully and comprehensively combined, the ultrasonic dissolution method is used to quickly and fully dissolve it, so that the substances can be combined in a fully dispersed state. The chitosan solution is dipped or sprayed onto the printed fabric, and then neutralized with alkali to make the chitosan firmly react in the pattern of the paint print, and the water washing fastness is very high, which also improves the printing fastness. The amount of chitosan is determined according to the printing depth, and the dosage range is 15-30 grams per liter. After chitosan treatment, the water washing fastness is above level 4. Similarly, the dry friction fastness and wet friction fastness also reach above level 3, which is in line with relevant national standards.

[0048] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A formulation for improving printing fastness of chitin in pigment digital printing, comprising a pigment inkjet printing slurry and chitin, wherein the formulation of the pigment inkjet printing slurry comprises: 0.5-5% coating; 20-30% adhesive; 1-3% thickener; 2-3% curing agent; 1.5% moisturizer; 74-59% water.

2. The application formula of chitosan for improving printing fastness in pigment digital printing according to claim 1, characterized in that: The chitosan contains natural high molecular weight polysaccharide, hydroxyl, acetylamino, amino, ketone, pyrrole, furan and pyridine.

3. The application formula of chitosan for improving printing fastness in pigment digital printing according to claim 2, characterized in that: The coating is a chemically non-reactive pigment.

4. The application formula of chitosan for improving printing fastness in pigment digital printing according to any one of claims 1 to 3 is used in pigment digital printing.

5. The application formula process of chitin in digital pigment printing to improve printing fastness is characterized by: The invention comprises a coating inkjet printing paste and chitin, wherein the chitin dosage ranges from 15 to 30 grams per liter. The coating inkjet printing paste comprises 0.5 to 5% coating, 20 to 30% adhesive, 1 to 3% thickener, 2 to 3% curing agent, 1.5% humectant and 74 to 59% water. The process comprises the following steps: Step 1: Mix the binder, thickener and hyperthyroidism to form a mixture; Step 2: mixing the mixture formed in step 1 with a curing agent, a moisturizing agent, water, a coating and chitin by an ultrasonic dissolution method to form a coating inkjet printing slurry; Step 3: Inject the coating inkjet printing slurry into the surface and interior of the fabric to achieve the printing effect; Step 4: Dip or spray the chitosan solution onto the printed fabric, and then neutralize it with alkali to make the chitosan react firmly in the pigment printing.

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