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Glue is widely used in fabric printing. As a water-based printing material, water-repellent sensitized adhesives are generally used in the process of plate making. However, blocking occurs frequently during operation. Glue is an acrylic resin. In the foregoing, we mentioned that acrylic resin is not malleable once cured. Therefore, once the paste is dried on the screen, it is difficult to clean it with water. If organic solvents, such as 783 and cyclohexanone, are used, Although it can be cleaned, the aqueous screen is not resistant to solvents. At this point, if you choose binary curing water and dual-type photosensitive adhesive can solve this problem.
Binary curing dual-purpose photosensitive adhesive, such as TPQ2120, is mainly composed of two photosensitive materials: a new type of diazo sensitizer and photosensitive polymer resin. The main components of the photosensitive polymer resin in the photosensitive adhesive are acrylic chemical materials and a photoinitiator. This component, as a polyvinyl alcohol and a diazo resin, can function with ultraviolet light sources of various wavelengths under general light sensing conditions. Crosslinking of the photopolymer increases the molecular weight of the material and thus enhances the imprint resistance of the imprinted film. Due to the use of a dual photosensitizer for the chemical composition, very fine resolution can be achieved, and because of its 35% solids content. , so the bridge is good and the edges of the picture are neat. It combines the advantages of easy control of diazo photosensitizers with the advantages of high-light polymer resins, enabling the formation of high-quality silk screen films.
TPQ2120 Dual Photosensitive Adhesive is different from other types of Photosensitive Adhesive. The photosensitizer does not need to be dissolved by water and can be directly added into the adhesive. Special attention should be paid to it. The specific operation is: pour the photosensitizer into the glue solution, fully stir it to make it completely dissolved, and mix it evenly until the air bubbles disappear. The glue solution is already sensitive to light before adding the photosensitizer. All operations should be performed under safe light or extremely weak light, and direct ultraviolet radiation is prohibited. TPQ2120 uses a 3kW iodine lamp source to achieve full curing, exposure time is controlled at 40 ~ 60s. Binary curing type photosensitive adhesive is easy to release film, can be reusable screen version, improve screen utilization.
In the environment of relatively high relative humidity, ordinary polyvinyl acetate-polyvinyl alcohol photosensitive adhesives are prone to absorb water and cause swelling of the printing plate, so the screen plate has poor resistance to printing force, and the solvent resistance of the binary curing dual-purpose type photosensitive adhesive and Water resistance is excellent, and it does not absorb water after drying. Therefore, it is suitable for use in areas with high relative humidity.
Binary curing solvent-resistant thick version of the rubber, such as TPQ2049, its greatest feature is excellent solvent resistance, both water resistance, high gloss film, after the screen plate film after finishing very high, is conducive to continuous rapid printing, and resistance Excellent friction performance, good film softness, strong adhesion, high printing rate. TPQ2049 has a solids content of 48%. It uses a thick blade sizing device for plate making. It is coated 3 to 4 times using interlayer drying (in order to increase the thickness, the coating stroke can be increased at each coating). After exposure, the film is developed. The thickness can reach 150-300μm. If a higher film thickness is required, the number of coating can be increased or the auxiliary tools can be used to pile up once, but this requires a longer drying time. The specific operations are as follows: (1) Prepare some auxiliary tools, such as a ruler (about 2mm thick), adhesive tape, etc.; (2) Make a primer, coat the printing surface and the squeegee side with a sizing device, and put it into a dry place at about 40°C. Drying in the box (approx. 20min); (3) Fix the ruler on one end and both sides of the screen with tape, and then pour a good sensitized adhesive on one end of the screen, slowly scrape it out and level it off. Put it into a drying oven at about 40°C to dry it. According to the thickness of the stack, the drying time is about 8 to 15 hours; (4) Exposure and development after drying, and application of water before the development, so as to shorten the development time.
The screen plate produced by this method can have a film thickness of about 1 mm. In actual use, it is generally not required to reach such a thickness. Generally, the maximum thickness is not more than 800 μm. A film plate that is too thick is not conducive to the printing operation.
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