Preparation method for special sizing agent for polycarboxylic acid hardboard

Abstract

The invention discloses a preparation method for a special sizing agent for a polycarboxylic acid hardboard. The special sizing agent comprises 25 to 30 wt% of a polycarboxylic acid-lignin water reducer and 70 to 75 wt% of a modified rosin resin. The preparation method comprises synthesis of a lignin water reducer, graft copolymerization of the lignin water reducer and a polycarboxylic water reducer, modification of a rosin resin and the like. According to the invention, lignosulfonate and the polycarboxylic water reducer undergo graft copolymerization to synthesize the special sizing agent for the polycarboxylic acid hardboard, so cost is saved, industrial waste is utilized, application performance and an application scope of the polycarboxylic water reducer are substantially improved, the problems of poor hydrophobicity, poor fluidity, high cost and the like of a sizing agent product for a common carton are effectively overcome, and fluidity, chelating capability and dispersion stability of a sizing agent for a carton are improved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a preparation method of a surface sizing agent, in particular to a preparation method of a special sizing agent for polycarboxylate cardboard. Background technique [0002] At present, the global paper product packaging industry is developing rapidly, and the market demand for various cardboard boxes is also increasing, and they are widely used in the outer packaging and transportation packaging of various products due to their high quality and environmental protection characteristics. In the case of increasingly fierce competition among carton companies and lower and lower profits, new technologies and methods that can improve production efficiency, product quality, save labor costs, and facilitate enterprise management are increasingly favored by carton companies. And attention, and constantly applied to the actual production. Cartons made of high-strength, moisture-res...

AI Technical Summary

Problems solved by technology

In order to improve the physical strength of cardboard, people choose thermosetting resin as the adhesive. For example, the Chinese patent "A Surface Sizing Agent for Improving the Crucibility of Paper and the Ring Crush Strength of Cardboard" (publication number CN 101050611A) discloses a water-soluble A mixture of thermosetting resin adhesives and curing agents. The surface sizing agent can improve the ink absorption of paper and improve the grade of paper products. However, the surface sizing agent has poor chelating ability and weak hydrophobicity when used. , poor liquidity and other defects