Trace amount of printing paste and preparation method and application thereof

Abstract

The invention discloses a trace amount of printing paste and a preparation method and application thereof. The printing paste is composed of liquid disperse dyes, a function prepolymer, a synthetic thickener, a functional addition agent and water. The trace amount of prepared printing paste can finish printing of a polyester fabric on a conventional rotary screen printing machine or a screen printing machine; high-temperature processing is performed through a tentering heat setting machine, the temperature is 180-210 DEG C, the time is 45-120 seconds, and a polyester printing fabric is prepared. The printing paste is used for printing and is characterized in that the printing process is short, the fabric is soft in touch, afttertreatment is not needed, plenty of water resources are saved, plenty of energy consumption is reduced, and there is almost no waste water emission. Processing devices are all conventional devices, and the preparation method is a green printing processing technology.

Description

technical field [0001] The invention belongs to the technical field of textile printing and dyeing, and in particular relates to a small amount of printing paste and its preparation method and application, which are used in the short process of polyester fabric printing, energy-saving and emission-reducing printing technology. Background technique [0002] With the development of the synthetic fiber industry, the mass production of various synthetic fibers and their blended fabrics puts forward new requirements for printing pastes. For example, the pigment printing of textiles, because the paint itself has no affinity, it needs the help of other substances to adhere to the surface of the fiber to form a film, and the color to form a pattern. In the textile printing and dyeing industry, powdery dyes are commonly used. When mixing pulp or preparing dye liquor, the dye dust is flying, which not only hinders environmental protection, but also often adheres to the ingredients use...

AI Technical Summary

Problems solved by technology

[0004] Direct printing is the main way of printing at present. It is a traditional processing technology that prepares commercially available dyes, pastes and additives into a printing paste with a certain viscosity, and then performs printing, drying, steaming and multi-channel washing; With the development of synthetic thickeners with high viscosity and low solid content, the amount of synthetic thickeners in printing pastes can be reduced. However, due to the poor compatibility between existing disperse dyes and synthetic thickeners, in order to obtain a certain Viscosity printing pastes still need to be equipped with synthetic thickener printing pastes with high solid content (such as 5-6%) to prevent the viscosity of the printing medium from decreasing

Due to the increase in the amount of synthetic thickeners in printing pastes, the utilization rate of direct printing dyes is low, and the printed fabrics need to be washed with a lot of water in the subsequent process to remove the floating colors on the surface of the fabrics, so as to improve the color fastness of polyester printed products and obtain softness. Therefore, the biggest disadvantage of direct printing is: due to the high content of solids in the printing paste, steaming treatment is required to complete the dyeing of the dye on the fiber; printed products have serious floating color and hard hand feeling, and post-washing treatment is required. Removing untransferred organic matter and dyes consumes a lot of water resources (accounting for 70% of the printing and dyeing process), and the discharge of wastewater is huge. The color of the wastewater is darker and the COD value is higher.

Existing pigment printing is a traditional processing technology that prepares commercially available paint, synthetic paste and additives (binders and crosslinking agents) into a printing paste with a certain viscosity, and then performs printing, drying, and high-temperature treatment; The amount of adhesive and crosslinking agent in printing is large, the printing effect is not good, and the color fastness is poor. The biggest disadvantage of pigment printing is: the performance of adhesive and crosslinking agent determines the color fastness and feel of printed products , compared with direct printing products, the color fastness is poor, the handle is hard or rough, and the color spectrum of the coating is not as rich and diverse as that of disperse dyes

Due to the shortcomings of pigment printing, the application of pigment printing is limited, and it can only be used for printed products with small areas or low requirements on hand feel; the existing thermal transfer printing of disperse dyes is to use disperse dyes with poor heat resistance and easy sublimation. The dyes are pre-printed on the transfer paper, and then the disperse dyes on the transfer paper are transferred to the fabric through the hot pressing of the transfer paper and the fabric; the biggest disadvantage of heat transfer printing is: poor color fastness, color and luster The depth is shallow, it is difficult to obtain dark printed products, and the same amount of transfer paper is consumed, resulting in waste of resources and secondary pollution (dye remaining on the transfer paper)

[0005] Today, as the requirements for energy saving, energy saving and emission reduction are getting more and more attention, it is necessary to develop new polyester fabric printing technology, which requires short printing process, low water consumption and low waste water discharge. It also has the advantages of excellent color fastness of direct printing and soft fabric feel; at the same time, it is necessary to avoid the disadvantages of large water consumption and large waste water discharge by direct printing, and avoid hard or rough hand feeling and poor color fastness of pigment printing. poor disadvantage

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