Dope used as back coat of white bottom coated white board paper and its preparing method and application

Abstract

The invention provides a coating material for back-coating white-bottom coated white paper board and a preparation method and an application thereof. The coating material comprises a composite white pigment 15 to 65 weight parts, heavy calcium carbonate 35 to 85 weight parts, latex 10 to 20 weight parts and water 25 to 45 weight parts. The composite white pigment is a composite material containing a titanium dioxide inner core and a calcium carbonate housing wrapping the inner core of the titanium dioxide particles. The coating material for back-coating white-bottom coated white paper board has the advantages of good covering performance, high brightness, uniform covering, uniform color and good surface effect, and can reduce the consumption of backside wood pulp by 20% to 50%.

Description

technical field [0001] The invention relates to a paint used for back-coating of white-coated white board paper. Background technique [0002] The back-coating coating formulations of white-coated white board paper on the market are usually compounded with heavy calcium carbonate, kaolin, latex and water. Among them, the crystal form of heavy calcium carbonate is irregular and the opacity is poor. If the amount is too large, the gloss of the coated paper will be low, the paper surface will be rough, and the ink absorption will be poor. Although the washed kaolin has a fine particle size, it can improve the gloss of the paper surface, but its whiteness If the degree is low, the whiteness of the paper will be reduced if the amount is too large, and the price will be high, which will increase the production cost of the paper. In addition, ordinary back-coated coatings have poor hiding properties, which will cause the surface of the coated paper to be blurred and uneven. It is ...

AI Technical Summary

Problems solved by technology

Among them, the crystal form of heavy calcium carbonate is irregular and the opacity is poor. If the amount is too large, the gloss of the coated paper will be low, the paper surface will be rough, and the ink absorption will be poor. Although the washed kaolin has a fine particle size, it can improve the gloss of the paper surface, but its whiteness If the degree is low, the whiteness of the paper will be reduced if the amount is too large, and the price will be high, which will increase the production cost of the paper

In addition, ordinary back-coated coatings have poor hiding properties, which will cause the surface of the coated paper to be blurred and uneven. It is necessary to control the weight of wood pulp on the back to 30-70g / m 2 In order to meet the requirements of use

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