阅读说明：本技术 一种高色牢度真丝面料的数码印花工艺 (Digital printing process of high-color-fastness silk fabric ) 是由 潘伟 潘金根 于 2020-07-27 设计创作，主要内容包括：本发明公开了一种高色牢度真丝面料的数码印花工艺,采用反复粉碎后的甘蔗渣纳米粉为原料,加入壳聚糖、二甲氨基氯乙烷盐酸盐得到印染糊料,整个反应过程简单,不添加对人体有害的有机物。本发明的甘蔗渣基印染糊料在使用时加入少量的氢氧化钠和尿素,就可以使M型活性染料在真丝表面染色效果非常好,色牢度可以达到5级。本发明采用了甘蔗渣基印染糊料,从而在上浆工序中无需加入元明粉、无机盐,减少了盐污染,安全健康,符合国家对印染行业的环保要求。(The invention discloses a digital printing process of silk fabric with high color fastness, which adopts bagasse nano powder after repeated crushing as a raw material, and adds chitosan and dimethylamino chloroethane hydrochloride to obtain printing and dyeing paste. When the bagasse-based printing and dyeing paste is used, a small amount of sodium hydroxide and urea are added, so that the M-type reactive dye has a very good dyeing effect on the surface of real silk, and the color fastness can reach 5 grades. The invention adopts bagasse-based printing and dyeing paste, so that no anhydrous sodium sulphate and inorganic salt are needed to be added in the sizing process, the salt pollution is reduced, and the printing and dyeing paste is safe and healthy and meets the national environmental protection requirement on the printing and dyeing industry.)

1. A digital printing process of a silk fabric with high color fastness is characterized by comprising the following steps: fabric sizing → drying → jet printing → steaming → cold water washing → hot water washing → soaping → hot water washing → cold water washing → drying;

the sizing agent used in the fabric sizing procedure consists of the following components in percentage by weight: 12-18% of bagasse-based printing paste, 0.2-0.5% of sodium hydroxide, 0.5-0.8% of urea and the balance of water.

2. The digital printing process of the silk fabric with high color fastness as claimed in claim 1, characterized in that the digital printing of the invention adopts reactive dyes.

3. The digital printing process of silk fabric with high color fastness as claimed in claim 2, wherein the reactive dye is M-type reactive dye.

4. The digital printing process of silk fabric with high color fastness as claimed in claim 1, wherein the preparation method of the bagasse-based printing paste comprises the following steps:

A. pretreatment of bagasse: washing bagasse raw materials with clear water, drying the bagasse by using an oven at the temperature of 30-50 ℃ to obtain bagasse with the solid content of 50-70%, repeatedly and mechanically crushing dried solid substances for 5-7 times, and sieving the solid substances with a 25-mesh sieve to obtain undersize;

B. further ultrasonic crushing the mechanically crushed bagasse: further carrying out ultrasonic crushing for 30-40min under the conditions that pure water is used as a solvent, the ultrasonic power is 500-800W and the material-liquid ratio is 1: 10-15, and filtering to obtain a filtrate containing bagasse; the filtered filter residue can be continuously crushed by ultrasonic;

C. then processing the mixture by ultrahigh pressure nanocrystallization equipment 250 and 280MPa until the particle size is 30-100nm, and concentrating and spray drying the mixture to obtain bagasse nano powder;

D. mixing bagasse nanopowder with chitosan and dimethylamino chloroethane hydrochloride, extruding with screw extruder, spraying ethanol to the material in the latter half of the extruder, drying, and mechanically pulverizing to obtain powder.

5. The digital printing process of silk fabric with high color fastness as claimed in claim 4, wherein the bagasse-based printing paste comprises the following components by weight percent: 80-88% of bagasse nano powder, 8-12% of chitosan and the balance of dimethylamino chloroethane hydrochloride.

Technical Field

The invention relates to the technical field of digital printing, in particular to a digital printing process of a silk fabric with high color fastness.

Background

The digital ink-jet printing technology is a great expansion of the ink-jet printing in the industrial application field. When the modern computer ink-jet printing technology is used for textile printing, various input means such as a scanner, a digital video camera, a digital camera and the like can be used for inputting required patterns into a computer in a digital mode, the required patterns are processed by various drawing software printing color separation systems, then the printing ink is directly sprayed onto various fiber fabrics through a computer-controlled digital ink-jet printing machine, and the required various patterns are printed.

In recent years, digital printing techniques have been rapidly developed. Compared with the traditional printing, the digital printing process is clean, the production process is flexible, remote ordering can be carried out, and the digital printing process is brought into a supply chain network, so that the digital printing process is the development direction of the textile printing technology in the future. However, due to the characteristics of mulberry silk, the fabric surface is smooth, the ink-jet printing cannot achieve the expected effect in practical application, and a plurality of problems exist, such as insufficient color depth of the ink-jet printing on the textile, large color difference with electronic patterns and the like, so that the development of the ink-jet printing of the textile is limited.

The digital printing process of the silk fabric with high color fastness needs to add a large amount of sodium alginate in the current market, the color fastness of the silk fabric after digital printing is generally 3-4 grade, and the digital printing process still has a space for improving the color fastness.

Disclosure of Invention

In order to solve the problems in the background art, the invention provides a digital printing process of a silk fabric with high color fastness.

A digital printing process of a silk fabric with high color fastness comprises the following steps: fabric sizing → drying → jet printing → steaming → cold water washing → hot water washing → soaping → hot water washing → cold water washing → drying;

the sizing agent used in the fabric sizing procedure consists of the following components in percentage by weight: 12-18% of bagasse-based printing paste, 0.2-0.5% of sodium hydroxide, 0.5-0.8% of urea and the balance of water.

Preferably, the digital printing of the present invention uses reactive dyes.

Further preferably, the reactive dye is an M-type reactive dye.

The preparation method of the bagasse-based printing paste comprises the following steps:

A. pretreatment of bagasse: washing bagasse raw materials with clear water, drying the bagasse by using an oven at the temperature of 30-50 ℃ to obtain bagasse with the solid content of 50-70%, repeatedly and mechanically crushing dried solid substances for 5-7 times, and sieving the solid substances with a 25-mesh sieve to obtain undersize;

B. further ultrasonic crushing the mechanically crushed bagasse: further carrying out ultrasonic crushing for 30-40min under the conditions that pure water is used as a solvent, the ultrasonic power is 500-800W and the material-liquid ratio is 1: 10-15, and filtering to obtain a filtrate containing bagasse; the filtered filter residue can be continuously crushed by ultrasonic;

C. then processing the mixture by ultrahigh pressure nanocrystallization equipment 250 and 280MPa until the particle size is 30-100nm, and concentrating and spray drying the mixture to obtain bagasse nano powder;

D. mixing bagasse nanopowder with chitosan and dimethylamino chloroethane hydrochloride, extruding with screw extruder, spraying ethanol to the material in the latter half of the extruder, drying, and mechanically pulverizing to obtain powder.

Preferably, the bagasse-based printing paste consists of the following components in percentage by weight: 80-88% of bagasse nano powder, 8-12% of chitosan and the balance of dimethylamino chloroethane hydrochloride.

Sugarcane is one of the main raw materials for sugar production. About 50% of the fiber of the bagasse, which remains after sugar pressing, can be used for paper making. However, some of the pith (marrow cells) have no interweaving force and should be removed before pulping. The bagasse fibers are about 0.65-2.17 mm in length and 21-28 μm in width. Although the fiber form is inferior to wood and bamboo, the fiber form is better than rice and wheat straw fiber. The pulp can be mixed with part of wood pulp to make offset printing paper, cement bag paper, etc. Although there are related patents that disclose the application of bagasse to the dyeing of fabrics, the color fastness of the dyed fabrics is generally of grade 3-4, and there is no description of the application of bagasse to printing pastes.

The digital printing process of the silk fabric with high color fastness adopts bagasse nano powder which is repeatedly crushed as a raw material, and chitosan and dimethylamino chloroethane hydrochloride are added to obtain the printing and dyeing paste, the whole reaction process is simple, and organic matters harmful to human bodies are not added. When the bagasse-based printing and dyeing paste is used, a small amount of sodium hydroxide and urea are added, so that the M-type reactive dye has a very good dyeing effect on the surface of real silk, and the color fastness can reach 5 grades. The invention adopts bagasse-based printing and dyeing paste, so that no anhydrous sodium sulphate and inorganic salt are needed to be added in the sizing process, the salt pollution is reduced, and the printing and dyeing paste is safe and healthy and meets the national environmental protection requirement on the printing and dyeing industry.

Detailed description of the invention