Introduction of the most popular pearlescent print

2022-08-01
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Introduction to common sense of pearlescent printing paste and problems needing attention in application. However, the amount of color coating shall be controlled below 1% to avoid affecting the flash effect

the composition of pearlescent printing paste is as follows:

pearlescent powder 10%~25%

penetrant

1%

urea 2%

adhesive paste 25%~x%

if color pearlescent paste is printed, the amount of pearlescent powder at both ends of the resistance system composed of friction pair equivalent resistance and embedded resistance R1 and R2 will be increased by applying 1 DC square wave voltage U. The amount of pearlescent powder is 15%~30%, the amount of color coating is 0.2%~1%, the amount of penetrant is 1%, the amount of urea is 2%, and the amount of adhesive paste is x%

it can be dried after printing, and then baked at 150 ℃ for 3min

prescription of pearlescent printing paste

pearlescent printing generally adopts direct printing process. It can be printed with pearlescent powder alone, or it can be mixed with color paint to become color pearlescent printing, but the amount of color paint should be controlled below 1%, otherwise the flash effect will be affected. The printing prescription is as follows

prescription of pearlescent printing paste (%):

pearlescent powder 10~25

penetrant 1

urea 2

adhesive paste 25~x

synthetic 100

requirements of pearlescent printing paste on adhesives, thickeners and related auxiliary agents

1 The adhesive shall be fully transparent after film forming, with good light resistance, heat resistance and other properties. It is best to be able to withstand dry cleaning (as required by foreign orders). At the same time, it is hoped that it has good dispersion performance for pearlescent pigments, and it is also hoped that it has self wetting performance. It is not difficult to see how critical the detection of elastic yellow is when adding 10% ~ 15% pearlescent powder into the paste, and it is required to have good fastness and hand feeling after heating and curing

2. after the synthetic thickener is pasted, it will be mixed with the adhesive. The thickener itself is a high molecular material and will also form a film. Its specific requirements are basically the same as those of the adhesive. It cannot turn yellow after high-temperature curing and film forming. The thickener itself cannot have yellow. For general coatings, please pay attention to regular inspection and maintenance. Thickeners with yellow appearance and heavy kerosene flavor used in the printing of experimental machines are not available

3. the selection of rheological property regulator and hand fastness regulator should also follow the above two principles to ensure the quality of printing paste to the greatest extent

problems that should be paid attention to in the application of YL type pearlescent printing paste

1) pearlescent printing generally encounters few problems, and most of the problems are caused by improper selection of pearlescent powder model or printing mesh. Therefore, it is better to use a visual magnifying glass with a scale (the division value is 0.1mm) to carefully observe the particle size of pearlescent powder under the conditions of standard light source or North Window natural light, and then refer to the specification table of pearlescent pigment, check the number, buy, mix and print

(2) generally, coarse screen printing or flowerpot printing is used for screen printing. It is appropriate to use 60 ~ 80 mesh screen printing, of which 80 mesh screen printing is the main screen printing. A few require that the printed pattern has a colorful metallic flashing effect, and 50~60 mesh screen printing can be used to get good results

(3) when preparing printing paste, add pearlescent powder and mix it well in a short time. As long as it is confirmed that the pearlescent powder has been evenly dispersed on the small sample, it can be printed on the large machine. Do not beat the pulp at high speed for a long time, so as not to damage the crystal structure of pearlescent pigments, resulting in a decline in gloss

(4) pearlescent pigments can be printed in the same size with other paints, but attention should be paid to the coordination of color and luster, showing the unique charm of pearlescent in the pattern of colored paints

information source: China washing and dyeing industry information center

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