Preparation method of rosin resin capable of being dissolved by low-concentration ammonia water

Abstract

The invention discloses a preparation method of rosin resin capable of being dissolved by low-concentration ammonia water, comprising the following steps of: carrying out addition reaction on rosin and fumaric acid under the protection of a rosin antioxidant to obtain fumaric acid modified rosin; adding 99% glycerol and an esterification catalyst, and esterifying by means of heat preservation; adding 1, 2-propylene glycol and ethylene glycol to participate in esterification reaction; and distilling under the conditions of high temperature and vacuum, and discharging and filling when the material is hot to obtain the rosin resin capable of being dissolved by low-concentration ammonia water. When the rosin resin is prepared, the use level of the rosin and fumaric acid can be accurately quantified, and the conation of the technological preparation can be optimized, so that alcohols can be put under the temperature of 195-200DEG C for reacting, the material can be accurately quantified, the putting mode and the putting sequence can be adjusted, the problem of the over-deep color of the resin can be effectively solved, the ammonia water dissolving stability of products can be guaranteed, and the materials can be dissolved with one another by 5-15% low-concentration ammonia water solution, and therefore, not only the adhesive force of products can be guaranteed, but also the influence to the environment when the rosin resin is used can be reduced.

Description

1. Technical field [0001] The invention relates to a preparation method of rosin resin which can be dissolved in low-concentration ammonia water, in particular to a preparation method of rosin resin dissolved in low-concentration ammonia water for tanning. 2. Background technology [0002] At present, commonly used solvent-based solid resins need 50%-60% toxic organic solvents such as toluene to be completely dissolved. When products using solvent-based solid resins are dried, their drying form is volatile drying. The volatilization of a large amount of organic solvents not only increases the production cost, but also causes great waste. What is more serious is that the volatilization of a large amount of toxic organic solvents such as toluene can easily lead to poor working conditions, damage the health of workers, and cause air pollution. The commonly used water-soluble resin emulsion is a liquid whose water content accounts for more than 50%, which greatly increases the d...

AI Technical Summary

Problems solved by technology

The volatilization of a large amount of organic solvents not only increases the production cost, but also causes great waste. What is more serious is that the volatilization of a large amount of toxic organic solvents such as toluene can easily lead to a bad working environment, damage the health of workers, and cause air p