阅读说明：本技术 一种环保数码印花工艺 (Environment-friendly digital printing process ) 是由 黄剑 于 2021-10-08 设计创作，主要内容包括：本发明涉及一种环保数码印花工艺,包括以下步骤：S1、织物预处理,采用内交联剂作为棉织物染料墨水数码印花的预处理剂,将棉织物置于预处理剂中浸轧；S2、烘干定型,将棉织物取出后烘干,再使用定型机热定型；S3、数码印花,对经过整平定型的棉织物进行数码印花；S4、二次烘干；S5、汽蒸烘焙,对棉织物进行汽蒸,然后对织物进行烘焙；S6、清洗,对烘焙后的织物进行清洗；S7、二次定型,对织物进行烘干。本发明通过采用内交联剂作为棉织物染料墨水数码印花的预处理剂,染料无需与纤维发生化学键合作用,可以将各种染料通过这种方式固着在棉织物上,处理过程不会产生大量的化学废水,有效的保护了环境。(The invention relates to an environment-friendly digital printing process, which comprises the following steps: s1, pretreating the fabric, namely, using an internal cross-linking agent as a pretreating agent for digital printing of cotton fabric dye ink, and padding the cotton fabric in the pretreating agent; s2, drying and shaping, namely taking out the cotton fabric, drying, and then carrying out heat shaping by using a shaping machine; s3, digital printing, namely, performing digital printing on the leveled and shaped cotton fabric; s4, secondary drying; s5, steaming and baking, namely steaming the cotton fabric, and then baking the fabric; s6, cleaning, namely cleaning the baked fabric; and S7, secondary setting, and drying the fabric. According to the invention, the internal cross-linking agent is used as the pretreating agent for the digital printing of the cotton fabric dye ink, the dye does not need to be chemically bonded with fibers, various dyes can be fixed on the cotton fabric in such a way, a large amount of chemical wastewater is not generated in the treatment process, and the environment is effectively protected.)

1. An environment-friendly digital printing process is characterized in that: the method comprises the following steps:

s1, pretreating the fabric, namely, using an internal cross-linking agent as a pretreating agent for digital printing of cotton fabric dye ink, placing the cotton fabric in the pretreating agent for padding, wherein the padding liquid pressure is 5kg, the padding liquid rate is 60-75%, the treatment temperature is 75-85 ℃, and the treatment time is 5-10 min;

s2, drying and shaping, namely taking out the cotton fabric, washing the cotton fabric by using clear water at 35-38 ℃, drying the cotton fabric at the temperature of 110-;

s3, digital printing, namely performing digital printing on the leveled and shaped cotton fabric, wherein the ambient temperature is controlled to be 25-30 ℃ during printing;

s4, secondary drying, drying the fabric at the temperature of 130-140 ℃, wherein the drying time is 5-10 min;

s5, steaming and baking, namely steaming the cotton fabric at the steam temperature of 135-145 ℃, wherein the steaming time is 3-7min, and then baking the fabric at the temperature of 140-150 ℃, and the drying time is 3-5 min;

s6, cleaning, namely cleaning the baked fabric;

s7, secondary setting, drying the fabric at the temperature of 155-165 ℃ for 40-80S.

2. The environment-friendly digital printing process according to claim 1, characterized in that: in step S1, the pretreating agent includes the following components by weight percent: 35-45% of hydroxyethyl methacrylate, 20-30% of low-formaldehyde resin DM-3510, 2-6% of sodium alginate, 3-5% of urea, 1-5% of glycerol, 1-2% of degreasing agent, 1-2% of penetrating agent, 1-3% of dye-retarding agent, 0.1-0.3% of catalyst and the balance of water.

3. The environment-friendly digital printing process according to claim 2, characterized in that: in step S1, the pretreating agent includes the following components by weight percent: 45% of hydroxyethyl methacrylate, 30% of low-formaldehyde resin DM-3510, 2.8% of sodium alginate, 3.7% of urea, 4.2% of glycerol, 1.5% of oil removal agent, 1% of penetrating agent, 1.5% of dye retarding agent, 0.2% of catalyst and the balance of water.

4. An environment-friendly digital printing process according to any one of claims 2 or 3, wherein: the oil removing agent is any one of alkylphenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether.

5. An environment-friendly digital printing process according to any one of claims 2 or 3, wherein: the catalyst is diammonium hydrogen phosphate.

6. An environment-friendly digital printing process according to any one of claims 2 or 3, wherein: the penetrating agent is a penetrating agent JFC.

7. An environment-friendly digital printing process according to any one of claims 2 or 3, wherein: the retarding agent is a mixture of anhydrous sodium sulphate and sodium chloride.

8. The environment-friendly digital printing process according to claim 1, characterized in that: the cleaning of step S6 includes the following substeps:

s6a, washing twice, namely soaking the cotton fabric in cold water, washing the fabric for 15min, and washing twice;

s6b, soaping, namely taking out the washed fabric, and washing the fabric for 2min at 75-85 ℃ by adopting a soaping agent with the concentration of 4-6 g/L;

and S6c, cleaning with cold water, and cleaning the fabric washed with the soap in the cold water for 8 min.

Technical Field

The invention relates to the technical field of printing, in particular to an environment-friendly digital printing process.

Background

In recent years, the application of the digital ink-jet printing technology to cotton fabrics is rapidly developed, compared with the traditional printing, the digital printing directly prints abundant patterns on the cotton fabrics by a digital technology, and the digital printing technology has the advantages of short production period, strong adaptability, more patterns, wide color area, high printing precision, low energy consumption pollution and the like, can adapt to the changeable and rapid market demand, and improves the high added value of the cotton fabrics.

In the prior art, cotton fabric is made of cotton fibers, has strong water absorption, wear resistance, washing resistance, softness, comfort, good warm keeping performance in winter and ventilation and coolness in summer, and is one of the most common clothes materials with excellent wearability, so the cotton fabric is the most popular clothes fabric for children. But the elasticity is poor, the shrinkage is high, and the fabric is easy to wrinkle. Printing on cotton fabrics is different from the traditional printing mode, and the current digital printing ink cannot prepare chemical additives and dyes together, so the additives must be applied to the cotton fabrics firstly, namely pretreatment. The pretreated slurry contains various components such as salt, alkali, penetrant, swelling agent, thickening agent, anti-sticking agent and the like, and the components are completely removed in the subsequent soaping process and enter sewage, so that the local ecological environment is destroyed.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an environment-friendly digital printing process to solve the problems in the background art.

The above object of the present invention is achieved by the following technical solutions:

an environment-friendly digital printing process comprises the following steps:

s1, pretreating the fabric, namely, using an internal cross-linking agent as a pretreating agent for digital printing of cotton fabric dye ink, placing the cotton fabric in the pretreating agent for padding, wherein the padding liquid pressure is 5kg, the padding liquid rate is 60-75%, the treatment temperature is 75-85 ℃, and the treatment time is 5-10 min;

s2, drying and shaping, namely taking out the cotton fabric, washing the cotton fabric by using clear water at 35-38 ℃, drying the cotton fabric at the temperature of 110-;

s3, digital printing, namely performing digital printing on the leveled and shaped cotton fabric, wherein the ambient temperature is controlled to be 25-30 ℃ during printing;

s4, secondary drying, drying the fabric at the temperature of 130-140 ℃, wherein the drying time is 5-10 min;

s5, steaming and baking, namely steaming the cotton fabric at the steam temperature of 135-145 ℃, wherein the steaming time is 3-7min, and then baking the fabric at the temperature of 140-150 ℃, and the drying time is 3-5 min;

s6, cleaning, namely cleaning the baked fabric;

s7, secondary setting, drying the fabric at the temperature of 155-165 ℃ for 40-80S.

The present invention in a preferred example may be further configured to: in step S1, the pretreating agent includes the following components by weight percent: 35-45% of hydroxyethyl methacrylate, 20-30% of low-formaldehyde resin DM-3510, 2-6% of sodium alginate, 3-5% of urea, 1-5% of glycerol, 1-2% of degreasing agent, 1-2% of penetrating agent, 1-3% of dye-retarding agent, 0.1-0.3% of catalyst and the balance of water.

The present invention in a preferred example may be further configured to: in step S1, the pretreating agent includes the following components by weight percent: 45% of hydroxyethyl methacrylate, 30% of low-formaldehyde resin DM-3510, 2.8% of sodium alginate, 3.7% of urea, 4.2% of glycerol, 1.5% of oil removal agent, 1% of penetrating agent, 1.5% of dye retarding agent, 0.2% of catalyst and the balance of water.

The present invention in a preferred example may be further configured to: the oil removing agent is any one of alkylphenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether.

The present invention in a preferred example may be further configured to: the catalyst is diammonium hydrogen phosphate.

The present invention in a preferred example may be further configured to: the penetrating agent is a penetrating agent JFC.

The present invention in a preferred example may be further configured to: the retarding agent is a mixture of anhydrous sodium sulphate and sodium chloride.

The present invention in a preferred example may be further configured to: the cleaning of step S6 includes the following substeps:

s6a, washing twice, namely soaking the cotton fabric in cold water, washing the fabric for 15min, and washing twice;

s6b, soaping, namely taking out the washed fabric, and washing the fabric for 2min at 75-85 ℃ by adopting a soaping agent with the concentration of 4-6 g/L;

and S6c, cleaning with cold water, and cleaning the fabric washed with the soap in the cold water for 8 min.

In conclusion, the beneficial technical effects of the invention are as follows:

the method adopts the internal cross-linking agent as the pretreating agent of the digital printing of the cotton fabric dye ink, dries the fabric after padding treatment, then performs the steps of digital printing, drying, steaming, re-melting drying, soaping, drying and the like, and finishes the processing process of the digital printing.

The basic principle is that the ink containing dye molecules is printed on a cotton fabric which is pretreated by resin and is not crosslinked, the dye and the resin molecules are diffused into the pore canal of a non-crystallization area of the cotton fiber in the steaming process, then the high-temperature melting and drying are carried out, and the dye molecules are locked in the cotton fiber through the crosslinking of the resin among the cotton fiber molecules, so that the dye is fixed on the cotton fabric.

According to the fixation mechanism, the dye does not need to generate chemical bonding action with the fiber, so that the water-soluble dye capable of dyeing cotton, such as reactive dye, acid dye, direct dye and the like, can be fixed on the cotton fabric in such a way, a large amount of chemical wastewater cannot be generated in the treatment process, and the environment is effectively protected. When the pretreatment process of the low-formaldehyde resin is adopted for digital printing, the dry rubbing color fastness is obviously superior to that of the conventional process, the soaping color fastness is equivalent to that of the conventional process, and the cotton fabric obtains the crease-resistant effect of resin finishing.

Drawings

FIG. 1 is a schematic process flow diagram of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

referring to fig. 1, the environment-friendly digital printing process disclosed by the invention comprises the following steps:

s1, pretreating the fabric, namely, using an internal cross-linking agent as a pretreating agent for digital printing of cotton fabric dye ink, placing the cotton fabric in the pretreating agent for padding, wherein the padding liquid pressure is 5kg, the padding liquid rate is 60%, the treatment temperature is 75 ℃, and the treatment time is 5 min;

s2, drying and shaping, namely taking out the cotton fabric, washing the cotton fabric with clear water at 35 ℃, drying the cotton fabric at 110 ℃, and then carrying out heat shaping by using a shaping machine at the shaping temperature of 185 ℃;

s3, digital printing, namely performing digital printing on the leveled and shaped cotton fabric, wherein the ambient temperature is controlled at 25 ℃ during printing;

s4, secondary drying, drying the fabric at 130 ℃ for 5 min;

s5, steaming and baking, namely steaming the cotton fabric at the steam temperature of 135 ℃ for 3min, and baking the fabric at the temperature of 140 ℃ for 3 min;

s6, cleaning, namely cleaning the baked fabric;

and S7, secondary shaping, and drying the fabric at 155 ℃ for 40S.

Wherein, in step S1, the pretreating agent comprises the following components in percentage by weight: 35% of hydroxyethyl methacrylate, 20% of low-formaldehyde resin DM-3510, 2% of sodium alginate, 3% of urea, 1% of glycerol, 1% of oil removal agent, 1% of penetrating agent, 1% of retarding agent, 0.1% of catalyst and the balance of water.

In this embodiment, the degreasing agent is alkylphenol ethoxylates, the catalyst is diammonium hydrogen phosphate, the penetrating agent is JFC, and the retarding agent is a mixture of anhydrous sodium sulfate and sodium chloride.

The cleaning of step S6 includes the following substeps:

s6a, washing twice, namely soaking the cotton fabric in cold water, washing the fabric for 15min, and washing twice;

s6b, soaping, namely taking out the washed fabric, and washing the fabric for 2min at 75 ℃ by adopting a soaping agent with the concentration of 4 g/L;

and S6c, cleaning with cold water, and cleaning the fabric washed with the soap in the cold water for 8 min.

Example two:

referring to fig. 1, the environment-friendly digital printing process disclosed by the invention comprises the following steps:

s1, pretreating the fabric, namely, using an internal cross-linking agent as a pretreating agent for digital printing of cotton fabric dye ink, placing the cotton fabric in the pretreating agent for padding, wherein the padding liquid pressure is 5kg, the padding liquid rate is 75%, the treatment temperature is 85 ℃, and the treatment time is 10 min;

s2, drying and shaping, namely taking out the cotton fabric, washing the cotton fabric with clear water at 38 ℃, drying the cotton fabric at 115 ℃, and then carrying out heat shaping by using a shaping machine at the shaping temperature of 195 ℃;

s3, digital printing, namely performing digital printing on the leveled and shaped cotton fabric, wherein the ambient temperature is controlled at 30 ℃ during printing;

s4, secondary drying, drying the fabric at 140 ℃ for 10 min;

s5, steaming and baking, namely steaming the cotton fabric at the steam temperature of 145 ℃ for 7min, and baking the fabric at the temperature of 150 ℃ for 5 min;

s6, cleaning, namely cleaning the baked fabric;

and S7, secondary shaping, and drying the fabric at 165 ℃ for 80S.

In step S1, the pretreating agent includes the following components by weight percent: 45% of hydroxyethyl methacrylate, 30% of low-formaldehyde resin DM-3510, 6% of sodium alginate, 5% of urea, 5% of glycerol, 2% of an oil removal agent, 2% of a penetrating agent, 3% of a retarding agent, 0.3% of a catalyst and the balance of water.

In this embodiment, the degreasing agent is fatty alcohol-polyoxyethylene ether, the catalyst is diammonium hydrogen phosphate, the penetrating agent is JFC, and the retarding agent is a mixture of anhydrous sodium sulphate and sodium chloride.

The cleaning of step S6 includes the following substeps:

s6a, washing twice, namely soaking the cotton fabric in cold water, washing the fabric for 15min, and washing twice;

s6b, soaping, namely taking out the washed fabric, and washing the fabric for 2min at 85 ℃ by adopting a soaping agent with the concentration of 6 g/L;

and S6c, cleaning with cold water, and cleaning the fabric washed with the soap in the cold water for 8 min.

Example three:

referring to fig. 1, the environment-friendly digital printing process disclosed by the invention comprises the following steps:

s1, pretreating the fabric, namely, using an internal cross-linking agent as a pretreating agent for digital printing of cotton fabric dye ink, placing the cotton fabric in the pretreating agent for padding, wherein the padding liquid pressure is 5kg, the padding liquid rate is 68%, the treatment temperature is 80 ℃, and the treatment time is 8 min;

s2, drying and shaping, namely taking out the cotton fabric, washing the cotton fabric with clear water at 36.5 ℃, drying the cotton fabric at 112 ℃, and then carrying out heat shaping by using a shaping machine at the shaping temperature of 190 ℃;

s3, digital printing, namely performing digital printing on the leveled and shaped cotton fabric, wherein the ambient temperature is controlled at 28 ℃ during printing;

s4, secondary drying, drying the fabric at 135 ℃ for 58 min;

s5, steaming and baking, namely steaming the cotton fabric at the steam temperature of 140 ℃ for 5min, and baking the fabric at the temperature of 145 ℃ for 4 min;

s6, cleaning, namely cleaning the baked fabric;

and S7, secondary setting, and drying the fabric at 160 ℃ for 60S.

In step S1, the pretreating agent includes the following components by weight percent: 45% of hydroxyethyl methacrylate, 30% of low-formaldehyde resin DM-3510, 2.8% of sodium alginate, 3.7% of urea, 4.2% of glycerol, 1.5% of oil removal agent, 1% of penetrating agent, 1.5% of dye retarding agent, 0.2% of catalyst and the balance of water.

In this embodiment, the degreasing agent is fatty alcohol-polyoxyethylene ether, the catalyst is diammonium hydrogen phosphate, the penetrating agent is JFC, and the retarding agent is a mixture of anhydrous sodium sulphate and sodium chloride.

The cleaning of step S6 includes the following substeps:

s6a, washing twice, namely soaking the cotton fabric in cold water, washing the fabric for 15min, and washing twice;

s6b, soaping, namely taking out the washed fabric, and washing the fabric for 2min at 80 ℃ by adopting a soaping agent with the concentration of 5 g/L;

and S6c, cleaning with cold water, and cleaning the fabric washed with the soap in the cold water for 8 min.

Among the three examples, the solubilizing, wetting, penetrating and swelling properties of urea play an important role in the coloring and fixing of cotton fiber printing. In the steaming color fixation process, a large amount of urea can absorb moisture, so that the cotton fiber is promoted to be continuously swelled, and meanwhile, the hydrogen bonds are broken up, so that the color paste can be quickly wetted and permeated into the fiber and fixed. The sodium alginate molecule contains secondary hydroxyl, so that the sodium alginate has excellent water holding property, urea can be effectively dissolved into the pretreatment agent, a uniform film is formed on the surface of the sized wool fabric, the color paste can be prevented from diffusing to the periphery, and the effect of the printed fabric is greatly improved.

The implementation principle of the embodiment is as follows: the method adopts the internal cross-linking agent as the pretreating agent of the digital printing of the cotton fabric dye ink, dries the fabric after padding treatment, then performs the steps of digital printing, drying, steaming, re-melting drying, soaping, drying and the like, and finishes the processing process of the digital printing. The basic principle is that the ink containing dye molecules is printed on a cotton fabric which is pretreated by resin and is not crosslinked, the dye and the resin molecules are diffused into the pore canal of a non-crystallization area of the cotton fiber in the steaming process, then the high-temperature melting and drying are carried out, and the dye molecules are locked in the cotton fiber through the crosslinking of the resin among the cotton fiber molecules, so that the dye is fixed on the cotton fabric.

According to the fixation mechanism, the dye does not need to generate chemical bonding action with the fiber, so that the water-soluble dye capable of dyeing cotton, such as reactive dye, acid dye, direct dye and the like, can be fixed on the cotton fabric in such a way, a large amount of chemical wastewater cannot be generated in the treatment process, and the environment is effectively protected. When the pretreatment process of the low-formaldehyde resin is adopted for digital printing, the dry rubbing color fastness is obviously superior to that of the conventional process, the soaping color fastness is equivalent to that of the conventional process, and the cotton fabric obtains the crease-resistant effect of resin finishing.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.