Boiling-resistant aqueous composite ink and preparation method thereof

Abstract

The invention discloses boiling-resistant aqueous composite ink and a preparation method thereof. The boiling-resistant aqueous composite ink mainly comprises raw materials including aqueous polyurethane resin, a pigment and water, and a surface wetting agent, a wetting dispersing agent and a defoaming agent are additionally added. The preparation method of the boiling-resistant aqueous composite ink comprises the following steps of: firstly, adding partial aqueous polyurethane resin into a stirring reaction kettle; secondly, slowly adding the surface wetting agent, the wetting dispersing agent and partial defoaming agent, and adding the pigment after stirring and dispersing; thirdly, stirring and dispersing at high speed, and grinding after dispersing; fourthly, adding the residual aqueous polyurethane resin and defoaming agent and stirring and dispersing, and adding the water until the required viscosity is obtained through regulation; and at last, stirring, dispersing, filtering and packaging. The boiling-resistant aqueous composite ink, provided by the invention, is prepared by taking the high-performance aqueous polyurethane resin as a connecting material, and has the advantages of good pigment dispersibility, wide use range, lower film forming temperature, better mechanical property of formed film, more uniform particle size distribution and the like, and can be used for soft retort packages.

Description

technical field

[0001] The invention relates to a composite ink for food packaging printed matter, in particular to a retort-resistant water-based composite ink and a preparation method thereof. Background technique

[0002] Since my country's ink manufacturing industry began to produce benzene-soluble composite inks with chlorinated polypropylene resin as the main binder in the early 1980s, it has developed relatively rapidly in the past 20 or 30 years, and the manufacturing and printing processes of inks are all different. has matured. However, from the analysis of the development trend of gravure composite ink, benzene-soluble composite ink has the following shortcomings that are difficult to overcome in the production and use: (1) A large amount of aromatic hydrocarbon solvents are used: because the main binder polyurethane resin of the ink is used in the synthesis process. Toluene, and it also needs to be dissolved with toluene; so the main resin of the existing benzene...