CN101709548B - Fabric pre-treating method for digital ink-jet printing of dispersed dye - Google Patents

Abstract

The invention relates to a fabric pretreatment method for disperse dye digital inkjet printing, comprising: (1) adding 1% to 5% of a water-soluble organic polymer, 2% to 3% of porous inorganic nanoparticles, and 0.1% of a surfactant % to 2% mixed with water evenly to obtain a pretreatment agent; (2) the fabric colored by disperse dyes is dipped, padded, coated or sprayed with the above pretreatment agent, and the liquid carrying rate of the fabric is 50% to 90%. Dry; then heat at 180-220°C for 0.5-2min. The method of the invention is simple and low in cost, and is suitable for industrialized production; the pretreatment agent is used for direct ink-jet printing on the fabric, the coloring is uniform, the bleeding phenomenon is suppressed, the printing precision is high, the border of the pattern is sharp, the details are clear, and the color is bright. The fabric is soft to the touch and has good fastness to washing, rubbing and sunlight.

Description

Fabric pretreatment method for digital inkjet printing with disperse dyes

technical field

The invention belongs to the field of fabric pretreatment for digital inkjet printing, in particular to a fabric pretreatment method for digital inkjet printing of disperse dyes.

Background technique

Since the invention of rotary screen printing in the 1960s, there has been no breakthrough in textile printing technology, and a production cycle still takes 4 to 16 weeks. At present, the world's printing market share continues to increase. Printing puts forward the requirements of on-demand design and manufacture and timely delivery, while traditional printing technology is obviously not suitable for the rapid and multi-variety production requirements of textiles. From the perspective of the popular cycle and quantity of textiles, there is less and less time left for textile production, which requires a new generation of printing technology. The emergence of digital inkjet printing technology is in response to this new market demand, and has developed rapidly in recent years. Digital inkjet printing is the application of digital inkjet printing technology to the printing of textiles. The pattern is input into the computer in digital form, and then the digital printing machine is controlled by special software, and the ink containing dye or pigment is sprayed onto the fabric to form various patterns. desired pattern.

Textile digital inkjet printing can not only achieve the effect of traditional printing, but also achieve the effect that traditional printing technology cannot achieve.

Piezoelectric inkjet printing technology is the mainstream of digital inkjet printing technology at present, and sublimation digital printing is a new printing method mainly developed for polyester and other fabrics. There are two methods: transfer printing and direct printing.

Patent ZL200510040110.1 introduces a fabric pretreatment method for inkjet printing with water-based pigment inks. The pretreatment liquid of this method is an aqueous solution of thickener and cationic additives, which can improve the vivid color of inkjet printing patterns to a certain extent. However, because it does not contain porous materials, the ink droplets of inkjet printing cannot be quickly absorbed by the fabric, and the edge of the ink droplets still penetrates each other, resulting in the edge of the inkjet printing pattern not being sharp enough.

Contents of the invention

The technical problem to be solved by the present invention is to provide a fabric pretreatment method for disperse dye digital inkjet printing, which is simple, low in cost, and suitable for industrial production; using the pretreatment agent for direct inkjet printing on fabrics, The coloring is uniform, the bleeding phenomenon is suppressed, the printing precision is high, the pattern border is sharp, the details are clear, the color is bright, the fabric feels soft, and has good washing, rubbing and light fastness.

A kind of fabric pretreatment method for disperse dye digital inkjet printing of the present invention comprises:

(1) 1%-5% of water-soluble organic polymer, 2%-3% of porous inorganic nanoparticles, 0.1%-2% of surfactant and water are uniformly mixed to obtain a pretreatment agent;

(2) Dipping, padding, coating or spraying the above-mentioned pretreatment agent on the desized fabric, the liquid carrying rate of the fabric is 50%-90%, drying at 50-80°C; then heating at 180-220°C 0.5～2min.

The step (1) water-soluble organic macromolecules are natural macromolecules or synthetic macromolecules; natural macromolecules are carboxymethyl cellulose, hydroxyethyl cellulose, sodium alginate, gum arabic, guar gum, etc.; The macromolecule is polyvinyl alcohol, polyvinylpyrrolidone, polyethylene glycol, polyoxyethylene, sodium polyacrylate, SMA17352H (ammonium salt of styrene maleic anhydride copolymer, product of Sartomer).

The porous inorganic nanoparticles in the step (1) are silicon dioxide (SiO ₂ ) nanoparticles (produced by Zhejiang Hongsheng Material Technology Co., Ltd.) with an average particle diameter of 20-50 nm and a specific surface area of 700 m ² /g.

Described step (1) tensio-active agent is sodium diisooctyl sulfonate (surfactant 1292), ethoxylated alkyl sodium sulfate (AES), lauryl ammonium sulfate (ALSA), lauryl Triethanolamine alkyl sulfate (K12-T/40), etc.

The mass percent composition of the pretreatment agent in the step (1) includes 4% of polyvinyl alcohol with a degree of polymerization of 2000, 3% of _SiO2 nanoparticles, 1.5% of surfactant 1292, and 91.5% of water.

The mass percent composition of the pretreatment agent in the step (1) includes 5% of polyethylene glycol with a molecular weight of 20000, 2% of _SiO2 nanoparticles, 2% of sodium ethoxylated alkyl sulfate, and 93% of water.

The mass percent composition of the pretreatment agent in the step (1) includes 1.5% of sodium alginate, 4% of _SiO2 nanoparticles, 1% of surfactant 1292, and 93.5% of water.

The fabric in step (2) is polyester, polyester cotton, acetate or spandex.

The heating in the step (2) adopts electric heating, infrared heating or high-temperature silicone oil heating.

Due to the wide variety of various fabric types and large differences in organizational structure, disperse dyes will diffuse to a large extent as the solvent in the ink moves along the capillary between fiber bundles during inkjet printing, resulting in severe bleeding and pattern outlines. Not clear. Therefore, for inkjet printing, in order to obtain high-quality and high-definition printing effects, it is necessary to carry out effective pretreatment on the fabric to inhibit the diffusion and bleeding of ink on fabrics with different structures and improve the color depth.

The invention adopts the organic/inorganic nano compound as the main component of the pretreatment agent, and is suitable for fabrics colored with disperse dyes such as polyester, polyester cotton, acetate and spandex. The pretreatment method of the present invention can avoid the complex and indirect printing method of first printing the pattern on the thermal transfer paper and then transferring it to the fabric, and directly inkjet printing on the fabric, and the coloring is uniform and the phenomenon of bleeding It is suppressed, the printing precision is high, the pattern border is sharp, the details are clear, and the color is bright. The fabric is soft to the touch and has good fastness to washing, rubbing and sunlight.

The color-fixing post-treatment process after inkjet printing is also different from the present invention. And the present invention is the pretreatment method that adopts water-based or weak-solvent type disperse dye ink-jet printing that proposes specially for disperse dye colored fabric. The pretreated fabric of the present invention has long-term storage stability under different air humidity and temperature.

Under the premise of bright colors and good color saturation of inkjet printing fabrics, the post-sublimation treatment temperature after inkjet printing should be adjusted according to the energy required by high-energy, medium-energy or low-energy disperse dyes. Lower the sublimation temperature and shorten the sublimation time as much as possible. Therefore, the difference between the present invention and the patent ZL 200510040110.1 mainly lies in: adopting the pretreatment method of the present invention, the fabric must be subjected to a short-term post-treatment of disperse dye sublimation and fixation at a temperature of about 200°C, so the pretreatment agent contains The solids cannot undergo qualitative change or yellowing during the sublimation process, and the solids will not be unevenly distributed on the surface of the fabric due to pyrolysis.

The invention is specially aimed at fabrics colored by disperse dyes, and proposes a pretreatment method using water-based or weak-solvent disperse dyes for ink-jet printing. The pretreated fabric of the present invention has long-term storage stability under different air humidity and temperature.

Beneficial effect

(1) The pretreatment method of the present invention can avoid printing the pattern on the thermal transfer paper first, and then transfer it to the complex and indirect printing method on the fabric, and directly inkjet printing on the fabric, and the coloring is even, The bleeding phenomenon is suppressed, the printing precision is high, the pattern border is sharp, the details are clear, and the color is bright. The fabric is soft to the touch and has good fastness to washing, rubbing and sunlight;

(2) The pretreated fabric of the present invention has long-term storage stability under different air humidity and temperature.

Detailed ways

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Example 1

The hydrophobicity of polyester fabric is strong, and the ink-jet printing phenomenon of direct water-based disperse dye ink is serious. The present invention adopts the following method to pretreat the polyester fabric.

Pretreatment agent composition:

Polyvinyl alcohol (polymerization degree 2000) 4%

_SiO2 nanoparticles 3%

Surfactant 1292 1.5%

Water 91.5%

Pretreatment process: the fabric is padded (two dipping and two padding), with a liquid rate of 70%, and then dried at 80°C.

Pretreatment effect: on a wide-format inkjet printing machine equipped with Epson nozzles, cloth feeding and receiving devices, water-based disperse dye inks are used to directly inkjet print pretreated polyester fabrics, and the printed fabrics are heated by infrared. Sublimation at 180°C for 1.5min. The inkjet printing pattern has clear outline, bright color, high color fastness and soft hand feeling.

Example 2

Polyester-cotton blended fabric (70/30) has poor absorption performance on water-based disperse dye ink, and the direct inkjet printing has a large degree of bleeding. The following pretreatment agents are used for pretreatment before inkjet printing.

Pretreatment agent composition:

Polyethylene glycol (molecular weight 20000) 5%

_SiO2 nanoparticles 2%

Sodium Ethoxylated Alkyl Sulfate (AES) 2%

Water 93%

Pretreatment process: The fabric is impregnated with a liquid retention rate of 80%, and then dried at 80°C.

Pretreatment effect: On a wide-format inkjet printing machine equipped with an Epson nozzle and a cloth feeding and receiving device, water-based disperse dye ink is used for direct inkjet printing, and the printed fabric is sublimated at 190°C for 1min by electric heating. After the fabric is ink-jet printed with water-based disperse dye ink, the outline of the pattern is clear, the printing precision is high, the color is bright, and the hand feels soft.

Example 3

Polyester fabrics have poor absorption performance on weak solvent-based disperse dye inks, and direct inkjet printing has serious bleeding.

Pretreatment agent composition:

Sodium Alginate 1.5%

_SiO2 nanoparticles 4%

Surfactant 1292 1%

Water 93.5%

Pretreatment process: the fabric is coated with a weight gain of 70%, and then dried at 60°C.

Pretreatment effect: on a wide-format inkjet printing machine equipped with Xaar XJ128 nozzles, cloth feeding and receiving devices, direct inkjet printing is performed with eco-solvent disperse dye inks, and the printed fabric is sublimated at 190°C by oil heating 0.5min. After the fabric is ink-jet printed with eco-solvent disperse dye ink, the outline of the pattern is clear, the details are clear, the color is bright, the color fastness is high, and the hand feels soft.

Example 4

Polyester-cotton blended fabric (70/30) has poor absorption performance on water-based disperse dye ink, and the direct inkjet printing has a large degree of bleeding. The following pretreatment agents are used for pretreatment before inkjet printing.

Pretreatment agent composition:

Carboxymethylcellulose 2%

_SiO2 nanoparticles 3%

Surfactant 1292 1%

Water 94%

Pretreatment process: the fabric is sprayed, the weight gain rate is 80%, and then dried at 60°C.

Pretreatment effect: On a wide-format inkjet printing machine equipped with a Spectra nozzle and a cloth feeding and receiving device, direct inkjet printing is performed with an eco-solvent disperse dye ink, and the printed fabric is sublimated at 200°C by 0.5 min. After the fabric is ink-jet printed with water-based disperse dye ink, the pattern outline is clear, the color is bright, and the hand feels soft.

Example 5

Acetate fabrics are pretreated with the following pretreatment agents before inkjet printing.

Pretreatment agent composition:

Gum Arabic 5%

_SiO2 nanoparticles 3%

Triethanolamine Lauryl Sulfate (K12-T/40) 1%

Water 91%

Pretreatment process: the fabric is sprayed, the weight gain rate is 50%, and then dried at 60°C.

Pretreatment effect: On a wide-format inkjet printing machine equipped with a Spectra nozzle and a cloth feeding and receiving device, the eco-solvent disperse dye ink is used for direct inkjet printing, and the printed fabric is sublimated at 220°C by 0.5 min. After the fabric is ink-jet printed with water-based disperse dye ink, the pattern outline is clear, the color is bright, and the hand feels soft.

Example 6

Pretreatment agent composition:

Polyvinylpyrrolidone 1.5%

_SiO2 nanoparticles 4%

Ammonium Lauryl Sulfate (ALSA) 1%

Water 93.5%

Pretreatment process: the fabric is coated with a liquid retention rate of 70%, and then dried at 60°C.

Pretreatment effect: on a wide-format inkjet printing machine equipped with Xaar XJ128 nozzles, cloth feeding and receiving devices, direct inkjet printing is performed with eco-solvent disperse dye inks, and the printed fabric is sublimated at 190°C by oil heating 0.5min. After the fabric is ink-jet printed with eco-solvent disperse dye ink, the outline of the pattern is clear, the details are clear, the color is bright, the color fastness is high, and the hand feels soft.

Comparative example 1

Except that the pretreatment agent does not add SiO ₂ nanoparticles, other pretreatment methods are exactly the same as in Example 1.

Pretreatment agent composition:

Polyvinyl alcohol (polymerization degree 2000) 4%

Surfactant 1292 1.5%

Water 94.5%

Pretreatment process flow: the fabric is dried at 80°C after two dipping and two rolling (liquid-carrying rate 70%).

Pretreatment effect: On a wide-format inkjet printing machine equipped with an Epson nozzle and a cloth feeding and receiving device, water-based disperse dye inks are used for direct inkjet printing. It is found that the ink dripping phenomenon is serious, and the ink droplets cannot be quickly printed during the printing process. Absorbed by the fabric and run on the surface of the fabric. The printed fabric was sublimated at 180°C for 1.5min. After inkjet printing, the polyester fabric feels soft, the pattern is blurred, and the four primary colors penetrate each other, resulting in a dark picture, and the details of the pattern cannot be clearly recognized.

Comparative example 2

Except that the pretreatment agent SiO _nanoparticle content is 1%, other pretreatment methods are exactly the same as in Example 1.

Pretreatment agent composition:

Polyvinyl alcohol (polymerization degree 2000) 4%

_SiO2 nanoparticles 1%

Surfactant 1292 1.5%

Water 93.5%

Pretreatment process: the fabric is dried at 80°C after two dipping and two rolling (with a liquid content rate of 70%), and the pretreatment is completed.

Pretreatment effect: On a wide-format inkjet printing machine equipped with Epson nozzles, cloth feeding and receiving devices, water-based disperse dye inks are used for direct inkjet printing. It is found that there is no ink dripping phenomenon, and ink droplets can be quickly absorbed Fabric absorbs. The printed fabric was sublimated at 180°C for 1.5min. After inkjet printing, the polyester fabric feels soft, and the details of the pattern can be recognized, but the outline of the pattern is blurred and the picture accuracy is not high.

Claims (6)

1. fabric pre-treating method that is used for digital ink-jet printing of dispersed dye comprises:

(1) water soluble organic polymer 1%～5%, porous, inorganic nano particle 2%～3%, surfactant 0.1%～2% and water are mixed, obtain pretreating agent; Wherein water soluble organic polymer is natural polymer or synthetic high polymer, natural polymer is carboxymethyl cellulose, hydroxyethylcellulose, sodium alginate, gum Arabic or guar gum, synthetic high polymer is polyvinyl alcohol, polyvinylpyrrolidone, polyethylene glycol, polyoxyethylene, Sodium Polyacrylate or SMA17352H, and wherein SMA17352H is the ammonium salt of styrene maleic anhydride copolymer; The porous, inorganic nano particle is average grain diameter 20～50nm, specific area 700m ²Silica (the SiO of/g ₂) nano particle; Surfactant is a succinate sodium 2-ethylhexyl, ethyoxyl alkyl sodium sulphate AES, ammonium lauryl sulfate ALSA or dodecyltriethanolamine sulfate K12-T/40;

(2) with the fabric after the destarch by flood, pad, coating or the above-mentioned pretreating agent of spraying, the fabric liquid carrying rate is 50%～90%, 50～80 ℃ of oven dry; Afterwards at 180～220 ℃ of heating 0.5～2min.

2. the fabric pre-treating method of a kind of digital ink-jet printing of dispersed dye according to claim 1 is characterized in that: the mass percent of described step (1) pretreating agent is formed and is comprised the polyvinyl alcohol 4% of the degree of polymerization 2000, SiO ₂Nano particle 3%, surfactant 12921.5%, water 91.5%.

3. the fabric pre-treating method of a kind of digital ink-jet printing of dispersed dye according to claim 1 is characterized in that: the mass percent of described step (1) pretreating agent is formed and is comprised molecular weight 20000 polyethylene glycol 5%, SiO ₂Nano particle 2%, ethyoxyl alkyl sodium sulphate 2%, water 93%.

4. the fabric pre-treating method of a kind of digital ink-jet printing of dispersed dye according to claim 1 is characterized in that: the mass percent of described step (1) pretreating agent is formed and is comprised sodium alginate 1.5%, SiO ₂Nano particle 4%, surfactant 12921%, water 93.5%.

5. the fabric pre-treating method of a kind of digital ink-jet printing of dispersed dye according to claim 1, it is characterized in that: described step (2) fabric is terylene, polyester-cotton blend, vinegar ester or spandex.

6. a kind of fabric pre-treating method according to claim 1 is characterized in that: described step (2) adds thermal recovery electrical heating, Infrared Heating or high-temperature silicon oil heating.