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Do you know the problems and solutions for the use of fabric paint printing paste?
- Dec 29, 2018 -

Printing paste is the key to affect the quality of paint printing. Good printing paste in addition to ensuring that the printed products are brightly colored. Strong tinting strength and good fastness. It is soft to the touch, has good light stability and chemical resistance, and must also ensure that the printing paste is non-toxic and harmless, and meets environmental protection and ecological requirements.


Problem

At present, most paint printing products are inferior to dye printing, lack of vividness, poor washing (soaping), friction and wear, especially on dark or special dark ground, and in light, soft or bulky Printing on fabrics, the contradiction between hand and fastness is more prominent, and there are defects such as free formaldehyde on the fabric and pollution problems such as exhaust gas.

In addition, since the paint paste is mostly prepared from a paste prepared by a synthetic thickener, it has a special rheology. In actual use, it is indicated that the synthetic thickener of such an anion is very sensitive to the electrolyte and affects the printing effect of the paint. For adhesives, low-formaldehyde melamine-based resin fixing agents are still used in foreign countries. The self-crosslinking monomers of adhesives produced by most domestic enterprises still use N-methylol acrylamide (3 of the total monomers). % ~ 5%), they release the armor from the aldehyde during baking and storage. It is difficult to ensure that the amyloid on the printed fabric is below the detection limit. Also, most of the reducing agents used for discharge printing contain formaldehyde, which makes coating printing difficult to apply to medium and high-grade textiles. These are all issues that need to be paid attention to when using paint printing paste. It is also a major problem that needs to be perfected in paint printing.


Solution

As a coloring component of textile printing, coatings must first consider the issues of printing vividness, tinting strength, color fastness and environmental protection. For the problem of color paste in paint printing, technically, it should mainly solve the problems of sensitivity to electrolyte, improvement rate, and thermal color denaturation.


Sensitivity to electrolytes

Because the synthetic thickener of the paint printing paste is very sensitive to the electrolyte, affecting the paint printing effect. Therefore, the dispersion of the pigment has a low electrolyte content. The influence on the viscosity of the printing paste is small, so that the printing reproducibility is good under high concentration conditions. The cost of use is also low.


Rate of increase

Different types of coatings have different lifting behavior curves. Most coatings produced by DyStar have excellent improvement rates. Only 30 g/L is needed to obtain the standard depth, and the coloring power is high. The FBB-01 black paint has a pure hue and does not cause the jelly (including synthetic paste) to produce a jelly-like gel. Color paste rheological properties are excellent. The application works well.


Thermochromic

The paint printing fabric is discolored after heat treatment, and this irreversible color change is generally produced after the thermal curing process. Visual changes can be found by visual inspection. The excellent performance of the paint printing was heat-fixed and cooled at room temperature for 30 min. Still can keep its color tone unchanged. For example, the HF type high-fastness paint produced by DyStar Company has a heat resistance range of 150 to 200 ° C, which is an excellent and rare product.