Alcohol-soluble mixed solvent and production method thereof

Abstract

The invention relates to the technical field of mixed solvents and particularly relates to an alcohol-soluble mixed solvent and a production method thereof. By the production method, the mixed solvent can be prepared conveniently. The prepared mixed solvent is clear and transparent in color, does not separate out precipitate, has excellent properties and is free of benzene and ketone to ensure the safety requirement of outer packing for foods. The mixed solvent comprises alcohol-soluble polyamide resin and an alcohol solvent which are at a weight ratio of 2:8, wherein the alcohol-soluble polyamide resin is prepared from the following raw materials in parts by weight: 25-35 parts of dimer acid, 15-25 parts of monomer acid and 35-50 parts of ethylenediamine. The production method comprises the following steps: adding weighed dimer acid, monomer acid and ethylenediamine into a reaction kettle; sucking air with a vacuum pump so that the pressure in the reaction kettle reaches 2.5MPa, and carrying out polycondensation reaction for 45min to obtain the alcohol-soluble polyamide resin; and mixing the alcohol-soluble polyamide resin with the alcohol solvent according to a weight ratio of 2:8 to obtain the alcohol-soluble mixed solvent.

Description

technical field [0001] The invention relates to the technical field of mixed solvents, in particular to an alcohol-soluble mixed solvent and a production method. Background technique [0002] At present, alcohol-soluble plastic printing has been widely promoted and popularized in Southeast Asia, Eastern Europe and other countries. [0003] It is a common method to use benzene-soluble gravure surface printing products in the outer packaging industry, but it is not suitable for food outer packaging safety standards. In order to ensure food safety, it is necessary to use solvents that do not contain benzene and ketones. Alcohol-soluble polyurethane inks have been promoted in China. With the development of plastic packaging, there are still some shortcomings in the quality of domestic alcohol-soluble solvents added to inks, such as darker color, poor transparency, low gloss, and serious tendency to gel. Contents of the invention [0004] In order to solve the above problems, ...

AI Technical Summary

Problems solved by technology

[0003] It is a common method to use benzene-soluble gravure surface printing products in the outer packaging industry, but it is not suitable for food outer packaging safety standards. In order to ensure food safety, it is necessary to use solvents that do not contain benzene and ketones. Alcohol-soluble polyurethane inks have been promoted in China. With the development of plastic packaging, there are still some deficiencies in the quality of domestic alcohol-soluble solvents added to inks, such as darker color, poor transparency, low gloss, serious tendency to gel, etc.