Method for coating water-transferring printing backing paper

Abstract

The invention belongs to the chemical industry and in particular relates to a method for coating water-transferring printing backing paper. The method is characterized in that: the water-transferring printing backing paper is coated at one time by adopting a mixture prepared from the following components in the weight ratio of rubber powder to hydroxypropyl methylcellulose to polyacrylamide to water of 100:(1-5):(0.5-1):(250-350). The method comprises the following specific steps of: dissolving and stirring the rubber powder and the water in the ratio at the temperature of 85 to 95 DEG C at first; reducing the temperature to 45 to 55 DEG C, adding the proportionally prepared hydroxypropyl methylcellulose and stirring; after stirring, transferring the stirred glue into a reaction kettle of a high-speed stirrer, adding the proportionally prepared polyacrylamide and stirring. In the method, by adoption of one-time coating, the cost is lower and the yield rate is higher.

Description

technical field [0001] The invention belongs to the chemical industry, and in particular relates to a coating method for water transfer printing bottom paper. Background technique [0002] Water transfer printing backing paper is mainly used for water transfer of printed labels on ceramics, wine bottles, furniture, crystal crafts, stainless steel, glass products and other crafts. The traditional process technology is: on the surface of the water transfer printing base paper, the mixed liquid of various compounds is used for three times of coating (three-layer coating), which is generally completed on a traditional coating machine, and the first layer of coating is made of kaolin styrene-butadiene Mixed slurry such as latex is coated with a scraper; the second layer is coated with a mixture of polymer compounds, sodium alginate, and coated starch, and is coated with a stick coating method or a doctor blade coating method; the third layer coating is also called Surface coatin...

AI Technical Summary

Problems solved by technology

[0003] 1. Due to the high moisture absorption of the surface rubber powder, when printing in places with high humidity such as rainy days or coastal areas, measures such as moisture removal and temperature control cannot meet the best requirements for printing, and the backing paper often appears Deformation, wrinkling, large stretchability, inaccurate color registration, low yield rate (general yield rate is about 92%);

[0004] 2. Since the surface coating is completed three times, the finished products such as chemicals, gas, electricity, oil, and wages required to coat one ton of base paper generally need to be 3,500 yuan / ton, which is too expensive;

[0005] 3. The more times of coating, the more difficult it is to grasp the stability of product quality, and the lower the yield rate is. Generally, the yield rate of coating factories is about 80%-90%.

[0006] 4. Due to the completion of three coatings, the surface of the finished product is coated with too much dosage (the general coating amount is 20g / m 2 ), after the water transfer is completed, it is difficult to completely scrape off the debris stuck on wine bottles, ceramics and other utensils. After the utensils are grilled, there will often be cracks or film marks formed by residual ash, which will cause the utensils to be scrapped. greatly increased profit and loss