High dispersibility water-soluble acroid resin prepared by continuous bulk polymerization, preparation and use thereon in printing ink

Abstract

The invention provides highly dispersed water soluble acrylic resin which is mainly used for water-based systems such as water-based ink. The invention adopts a continuous method for bulk polymerization and has chemical reactions in the chemical environment of high temperature and high pressure. On one hand, the manufacturing process by the continuous method effectively inhibits the gel effect in the bulk polymerization, thereby ensuring the unicity of the distribution of the molecular weight of the resin; on the other hand, the high-temperature high-pressure chemical reaction conditions facilitate the strict control on the size of the molecular weight, thereby preparing the water soluble acrylic resin with the weight-average molecular weight of between 6, 000 and 9, 000, and the distribution index of the molecular weight less than or equal to 2. The resin prepared according to the method is applicable to the water-based ink which meets the requirements of high mesh wire, high accuracy and environmental protection on water-based ink with high solid content, high color content, low viscosity and high drying rate.

Description

technical field [0001] The invention relates to an acrylic resin mainly used in water-based ink, and also relates to its preparation process and its application in ink. Background technique [0002] In recent years, the water-based ink market has become larger and larger, and there are more and more varieties of water-based inks. Early water-based inks used maleic anhydride-modified natural rosin as the pigment dispersion resin. The water-based inks produced with this resin, the pigment content Low (generally no more than 10%), poor color rendering, deep white ink color, and slow drying speed, it is difficult to adapt to the requirements of modern high-speed printing. At present, acrylic resin aqueous solution and acrylic emulsion are generally used to produce water-based inks, and acrylic resin solution is used as a pigment dispersion resin. The resin has good dispersibility and wettability to pigments, and the pigment content can reach more than 35%, and the color renderin...

AI Technical Summary

Problems solved by technology

Since the commonly used acrylic resin is solid under normal temperature and pressure conditions, the reaction monomer will turn into gas at high temperature, so the reaction can only be carried out under high temperature and high pressure conditions, and the reaction conditions have put forward strict requirements for the reaction equipment; later, foreign countries Someone proposes to use suspension polymerization to prepare water-soluble acrylic solid resin for water-based inks, but suspension polymerization needs to introduce reaction materials such as protective glue, and the product needs to be post-treated to remove impurities, improve purity, hardness and gloss; at the same time, the resin molecular weight distribution index On the high side, so that the viscosity of the ink is high, so far there are few products produced by this process in the market; Rahm & Haas company applied for the preparation of this type of water-soluble acrylic resin by pipeline method, but it is rarely used so far; Schmidt et al. proposed to use continuous stirring reaction A kettle is used to prepare solid acrylic resin with low molecular weight and uniform molecular weight distribution. When stirring, a coil is required to solve the problem of discharge of reaction heat, so as to control the molecular weight distribution. The equipment requirements are very strict.

[0006] There are few solid acrylic resins prepared by bulk polymerization, such as polyacrylonitrile-butadiene-styrene (ABS) engineering plastics, which are widely used, are also prepared by solution polymerization, such as plexiglass (PMMA) and vinyl chloride. Bulk polymerization, but it cannot effectively solve the problem of reaction heat discharge, all of which are discontinuous polymerization

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