Preparation method of zero-VOC high-performance alcoholic acid emulsion

Abstract

The invention discloses a preparation method of a zero-VOC high-performance alcoholic acid emulsion. The preparation method comprises the following steps: firstly, performing alcoholysis on a drying oil or a semi-drying oil and a polyhydric alcohol under the action of a high temperature and an alcoholysis catalyst, and then performing an esterification reaction with polybasic acid to obtain an air-drying alkyd resin; next, moving the alkyd resin to a reaction kettle with a circulating water jacket, heating the circulating water in the jacket of the reaction kettle until an emulsification temperature, controlling the rotating speed to the range of 170rpm to 180rpm, adding a neutralizer to the reaction kettle and mixing thoroughly and evenly; keeping the temperature unchanged, and adding a proper amount of emulsifier to the reaction kettle, adjusting the rotating speed to the range of 250rpm to 270rpm, and stirring for 30 to 45 minutes; heating deionized water equivalent to the resin by mass until an emulsification temperature and slowly and dropwise adding the deionized water to the reaction kettle at a constant speed in about 3-5 hours; and furthermore, cooling in water bath under stirring until a room temperature, regulating the pH value of the emulsion by use of a pH regulator to the range of 5-7, and filtering to obtain the zero-VOC high-performance alcoholic acid emulsion. According to the preparation method, zero VOC emission is really realized in the production and application processes.

Description

technical field [0001] The invention relates to a preparation method of an alkyd emulsion, in particular to a preparation method of a zero-VOC high-performance alkyd emulsion, and belongs to the technical field of polymer chemistry and emulsion polymerization. Background technique [0002] Volatile organic compounds (VOCs) emitted by the paint and coating industry include hydrocarbons, organic halides, organic sulfides, etc. With the improvement of environmental protection regulations and the continuous enhancement of environmental protection awareness, the introduction of non-toxic and cheap water into coatings can not only save resources, reduce costs, but also reduce VOC emissions, which makes water-based coatings develop rapidly. [0003] Alkyd resin has the characteristics of oxidative self-crosslinking, full coating, good decoration, easy construction, good comprehensive performance, and uses vegetable oil-renewable resource as raw material, with sustainable developmen...

AI Technical Summary

Problems solved by technology

[0005] 1. Water dispersion alkyd emulsion: use the temperature phase inversion method (phase inversion temperature, PIT) or phase inversion emulsification point method (emulsion inversion point, EIP) to emulsify the alkyd resin with the aid of an emulsifier to obtain a water-dispersed alkyd Adding a large amount of resin and phase-inversion emulsifier makes the paint film poor in water resistance, film-forming property and decorative property;