Waterproof carbon paper chromogenic layer coating

Abstract

The invention discloses a waterproof carbon paper chromogenic layer coating. The coating comprises, by weight, 3-5 parts of light calcium carbonate, 2-4 parts of calcined kaolin, 1.5-1.8 parts of activated clay, 2-4 parts of corn modified starch, 0.6-0.8 parts of carboxymethylcellulose sodium, 3-5 parts of paraffin, 0.5-0.7 parts of an emulsifier, 5-8 parts of styrene-butadiene latex, 3-5 parts of polyamine polyepoxy resin, 0.5-0.8 parts of a composite dispersant, 1-2 parts of dimethicone, 3-5 parts of carboxylic styrene butadiene latex and 1.2-1.5 parts of titanium dioxide. Light calcium carbonate with fine and uniform particle size is easy to obtain, is safe and environmentally friendly, and has no pollution to human bodies or environment; the composite dispersant allows the prepared coating to have low viscosity, few bubbles and low dynamic surface tension and to reach below 40dyne; and activated clay is applied to make the coating have the advantages of fast chromogenic speed, high whiteness and uniform hue and to make a coat obtained through using the coating have smooth and flattened surface, high glossiness, and good and lasting waterproof effect.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a color-developing layer coating for waterproof carbon paper. Background technique [0002] Carbonless copy paper is a kind of leuco copy paper, which has the functions of direct copying and direct color development. Its color development is mainly: under the action of external force, the force-sensitive pigment and oil solution in the microcapsules overflow and contact with the color developer to cause a dyeing reaction, thereby playing the role of copying. It is mainly used for multiple forms, bills, continuous financial notes, general business financial notes, etc. [0003] There are two types of coatings in carbonless copy paper: a CF layer containing a chromogenic agent and a CB layer containing a chromogenic agent. The chromogenic agent is a special colorless dye that has been dissolved in non-volatile carrier oil and encapsulated by microcapsules of 3-7 μm. The impact ...

AI Technical Summary

Problems solved by technology

The method of water resistance is mainly to add a waterproof coating layer. The existing carton waterproof coating generally contains a large amount of organic solvents, which seriously pollutes the air and does not meet the requirements of environmental protection; at the same time, the surface tension is large and the combination with the paper molecules is not good. Tight, not firm, the surface of the coating is uneven and not smooth, cracking and loss of light occur from time to time, the waterproof performance is low and not durable