A kind of preparation method of paper coating, coated paper and paper coating

Abstract

The invention discloses a paper coating, coating paper and a preparing method for the paper coating. The paper coating is prepared from, by mass, 60-100 parts of light calcium carbonate, 0-40 parts ofkaolin, 3-30 parts of polyvinyl alcohol with the alcoholysis degree larger than or equal to 88%, 0.1-3 parts of a polyfunctional group polymer and 5-40 parts of divalent metal salt, wherein the totalmass of the light calcium carbonate and the kaolin is 100 parts. By means of the paper coating, the coating paper and the preparing method for the paper coating in the mode, the solid content of thepaper coating can be increased, and the running performance of the paper costing is improved.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to a paper coating, coated paper and a preparation method for the paper coating. Background technique [0002] At present, high-speed commercial inkjet printing machines based on inkjet technology are developing rapidly in the market, and the demand for applicable inkjet printing paper continues to increase with the increase in the installed capacity of inkjet printing machines. At present, there are relatively mature technical researches on the use of silica, magnesium aluminum silicate and other porous pigments as coating pigments in the coating of inkjet printing paper in China, but because of the high cost and poor coating performance, there is no Mass production. [0003] The research on calcium carbonate as the main pigment system of the coating has also entered a certain stage: for example, in a prior art, paper coatings include light calcium carbonate, plastic pigments, crosslink...

AI Technical Summary

Problems solved by technology

Plastic pigments and silane-modified polyvinyl alcohol are used in the paint, which are difficult to find, expensive and have no practical operation instructions

For another example, paper coatings include light calcium carbonate, porous pigments, metal salts, and modified polyvinyl alcohol; on the one hand, the above-mentioned modified polyvinyl alcohol is still a silane-modified polyvinyl alcohol that is difficult to find and expensive; On the other hand, the porous pigment used in the coating is difficult to disperse and the process is complicated

Another example is a paper coating, the main pigment system is calcium carbonate, calcined china clay, plastic pigments, and silicon dioxide; this solution uses plastic pigments, which makes the coating cost high; in addition, the solution contains nano-silica, which is difficult to disperse. Paint running error

[0004] The paper coatings in the above-mentioned cases with calcium carbonate as the main pigment system reduce the cost of raw materials compared with the nano-silica-based system, but like the silica or magnesium aluminum silicate system, the coating has low solid content and poor water retention. , during the coating process of large-scale high-speed coating machines, problems such as backflow, yellow lines, insufficient drying capacity and sticky rolls are prone to occur, so the output is low and the production cost is high

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