Patent display(2) Dry embossed color-changing resin and preparation method and application

Technical field

The present invention belongs to the technical field of chemical products and preparation methods thereof, in particular to a dry embossed color-changing resin, and also relates to the preparation method and application of the dry-embossed color-changing resin.

Background

Trademark leather, also known as compression PU, after being subjected to external pressure, the color change occurs at the surface of the force, and the color of the pattern after hot pressing is darker than the original base color, which has obvious differences, enhances the visual effect, and beautifies the product appearance.It can be used to emboss brand LOGO, text, pattern, etc., mainly used for high-end notebooks, notepads, trademark production, universal manuals, award certificates, business card books, business card bags, check holders, key bags, silver bags, passport bags, manager bags, leather goods gifts, etc.

Existing trademark leather is usually prepared by wet process, usually through wet coating, water solidification, washing, drying and other processes to make semi-finished products, and then through embossing or surface treatment and other processes to produce. If the surface needs a specific pattern, dry veneer is also needed, and after the veneer is done, the embossing color change effect will be much worse. Wet preparation of trademark leather production line length, many art control points, the need for more online workers, so the production speed is slow, low efficiency, high cost.

Contents of the Invention

Purpose of the Invention :In order to overcome the above defects, the object of the present invention is to provide a dry embossed color-changing resin and preparation method and application thereof.

Technical solutions:The present invention provides a dry embossing color-changing resin, made of components of the following weight: Polyester Polyol compounds 15-25 parts, glycol 1-2 parts, 1,4-butanediol 1-2 parts, diphenylmethane diisocyanate 8-10 parts, ultrafine urea 10-20 parts, dimethylformamide 50-60 parts.

Preferably, polyester polyol compounds 18-22 parts, hydroxyl-containing low molecular weight compounds 1.4-1.6 parts, diphenylmethane diisocyanate 8.5-9.5 parts, ultrafine urea 14-16 parts, dimethylformamide 52-58 parts.

As another preferred, the molecular weight of the polyester polyol compound is 1500-2500; The polyester polyol compound is prepared from adipic acid and 1,4-butanediol.

As another preferred, the particle size of the ultrafine urea is less than 0.1mm.

The present invention further provides a method for preparing the above-described dry embossed color-changing resin, comprising the following steps:

(1) The adipic acid is mixed with 1,4-butanediol to give a polyester polyol compound;

(2) The polyester polyol compound, ethylene glycol and 1,4-butanediol mixed with dimethylformamide dilution, and then added diphenylmethane diisocyanate, mixed to make the reaction;

(3) Step (2) When the viscosity of the reaction system reaches 2wcps/25 °C, ultrafine urea is added, mixed well, cooled, and obtained.

In step (1), the reaction temperature is 140-200°C and the reaction time is 3-5h.

In step (2), the reaction temperature is 70-80 °C.

The present invention further provides the application of the above dry embossed color-changing resin in the preparation of color-changing leather, comprising the following steps:

(1) After mixing the dry embossing color-changing resin with the transparent pigment, it is coated on the release paper and dried;

(2) After adding the adhesive layer PU resin to the organic pigment and mixing well, it is coated on the dry embossing color-changing resin in step (1) and dried;

(3) Will BASE (meaning what?) Is there Chinese name) attached to the adhesive layer PU resin in step (2), dried, and peeled off from the release paper;

(4) The product obtained in step (3) is watered, kneaded, dried, and obtained.

In step (1), the mixing temperature is room temperature; The coating thickness is 0.15-0.2mm, the drying temperature is 100-120°C, and the drying time is 3-10min.

In step (2), the drying temperature is 100-120°C and the drying time is 3-5 min.

In step (3), the drying temperature is 100-130°C and the drying time is 3-5min.

In step (4), the drying temperature is 100-130°C and the drying time is 3-5 min.

Beneficial effects:The dry embossing color-changing resin provided by the present invention is simple and inexpensive, using ultra-fine powder of urea as raw material, and other raw materials are the same as organic matter, the density is similar, there will be no sedimentation or stratification precipitation problems; The resin is applied to the dry preparation of color-changing leather, which gets rid of the cumbersome wet solidification process, greatly reduces the production cost and production energy consumption, and improves the production efficiency.

The resin is applied to the dry method to prepare color-changing leather, due to the use of release paper method, the products made are more diverse, greatly expand the scope of use of the product, and have broader application prospects; At the same time, the color change effect of the resin is much better than that of existing products.