Nylon waterborne dispersion and preparation method thereof

Abstract

The invention relates to nylon waterborne dispersion and a preparation method thereof. The nylon waterborne dispersion is prepared by, by weight, 30-35 parts of powdered nylon 66, 0.02-0.08 part of di-tert-butyl peroxide, 1-3 parts of monoalkyl maleate, 1-3 parts of aliphatic lactone solvent, 75-85 parts of deionized water and 0.3-1.0 part of ammonia water. The preparation method includes: using the aliphatic lactone solvent to dissolve the powdered nylon 66 at 130-140 DEG C; using peroxide of 140-150 DEG C to perform free-radical substitution on hydrogen atoms, connected with amide nitrogen atoms, on nylon molecular chain segments, introducing the monoalkyl maleate which is incapable of self-polymerization, lowering film-forming temperature, and allowing the carboxyl of the monoalkyl maleate to be neutralized by the ammonia water to generate water stability. By the nylon waterborne dispersion which is promising in application prospect in fields such as cigarette package printing ink and plastic surface printing ink, the problem that waterborne resin in current waterborne ink is poor in wear resistance and heat resistance is solved.

Description

technical field [0001] The invention relates to an aqueous dispersion and a preparation method thereof, in particular to an aqueous nylon dispersion and a preparation method thereof. Background technique [0002] Water-based resin is a resin system in which water replaces organic solvents as the dispersion medium, and is fused with water to form a solution. Commonly used water-based resins are acrylic emulsion and water-based polyurethane. Acrylic emulsion has high solid content and low cost, but has disadvantages such as hot stickiness, cold brittleness, and poor friction resistance; water-based polyurethane has good low-temperature flexibility and good friction resistance, but has low solid content, poor solvent release, and high cost. [0003] With the application and development of high-speed cigarette pack printing and surface printing water-based technology products, there is an urgent need for water-based resin materials with strong wear resistance, heat resistance t...

AI Technical Summary

Problems solved by technology

However, in the field of water-based resins, nylon has no application because of its poor solubility in most solvents, and the research on the modification of nylon at home and abroad is limited to the surface modification of nylon molded parts and nylon films. Mixed modification, there is no technology for modifying nylon in solution state