A thermal transfer printing method for building walls

Abstract

A thermal transfer printing method for building walls disclosed by the invention comprises the following steps: after curing an adhesive containing polyvinylpyrrolidone to a curing rate of 40%, preparing a thermal transfer printing film as an adhesive layer; Apply raw lacquer on the wall of the building to be transferred until the surface of the wall of the building to be transferred is flat; within 1-5 minutes, the thermal transfer printing film is attached to the wall of the building to be transferred, and treated with ultraviolet radiation to cure the thermal transfer The printing film can improve the adhesion between the thermal transfer finishing and the wall for the building wall, keep the decorative surface after thermal transfer consistent, prevent the phenomenon of anti-sticking, and realize UV ​​curing without photoinitiator.

Description

technical field [0001] The invention relates to the field of wall surface processing in the construction field, in particular to a thermal transfer printing method for building walls. Background technique [0002] Because of the need to print relevant images on the building wall, thermal transfer printing technology will be used. Thermal transfer printing technology means that the adhesive layer on the flower film is melted into a viscoelastic state under the action of a high-temperature hot roller, and the pressure of the hot roller will then bond The layer is quickly bonded to the surface of the material to be transferred, and then the flower film is quickly cooled and rolled up. The separation layer is torn, the PET film is cleaned up, and finally the protection on the flower film, the layer, the ink layer, and the adhesive layer are removed. Adheres to the material to be transferred. [0003] Hot-melt adhesive is a kind of plastic adhesive, often used as thermal transfe...

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Problems solved by technology

[0003] Hot-melt adhesive is a kind of plastic adhesive, often used as thermal transfer adhesive material, it is in solid state at room temperature, and can be bonded quickly after heating and melting, but the bonding layer that only uses hot-melt adhesive is due to hot-melt adhesive melting. The bulk viscosity is generally high, and the wettability to the adhered material is poor. Usually, pressure bonding is required to improve the bonding strength; At high ambient temperatures, the adhesive layer is prone to sticking to PET after hot-melting ("back-adhesion"), thus limiting its application to some extent

[0004] For the building wall, the outer wall is often uneven. In the prior art, in order to improve the adhesion of the adhesive layer and keep the decorative surface consistent after transfer, other materials such as aluminum plates, glass, etc. are used as heat transfer materials. When printing the carrier, the thermal transfer paper and the decorative surface of the aluminum plate are closely pasted with thermal transfer glue, which will cause the above-mentioned "reverse sticking" phenomenon; another way is to use a tubular heat-resistant plastic expansion bag to cover the dry laying After the aluminum plate of the thermal transfer paper is finished, the thermal transfer paper can be fully and effectively attached to the aluminum plate by vacuuming. However, for the wall, the area is too large and it is inconvenient to move, so it is used during the curing process. Vacuum

[0005] In the prior art, there is a method of using UV curing of the adhesive layer instead of thermal curing, but the effect is not good. The reason is that although the UV-cured adhesive layer will not cause "reverse sticking" due to the increase in ambient temperature, the ultraviolet rays pass through the ink. After layering, less ultraviolet light can be radiated to the adhesive layer, resulting in long curing time, incomplete curing, and decreased adhesion, and a photoinitiator must be added to the adhesive layer to cause polymerization and curing of the adhesive