Alkyd resin preparation method and resin prepared by the same, and acrylic acid modified alkyd resin preparation method and resin prepared by the same

Abstract

The invention provides an alkyd resin preparation method and a resin prepared by the same, and an acrylic acid modified alkyd resin preparation method and a resin prepared by the same. According to the alkyd resin preparation method, vegetable oil is used as a raw material, and unsaturated carboxylic acid and / or unsaturated anhydride are / is added step by step, so that the structure of the alkyd resin is improved. According to the preparation method of the acrylic acid modified alkyd resin, a unsaturated monomer is fed step by step, and the feeding time is controlled, so that the unsaturated monomer is uniformly grafted on an alkyd resin, and the molecular weight distribution is narrow. The acrylic acid modified alkyd resin prepared by the preparation method is applied to water-based coating materials, so that a paint film has the advantages of high drying speed, high glossiness, good fullness, low VOC emission, excellent comprehensive performance and the like.

Description

technical field [0001] The invention relates to a preparation method of alkyd resin and a preparation method of acrylic acid modified alkyd resin. The resin prepared by the method for preparing the acrylic modified alkyd resin is applied in the field of coatings, especially in the field of water-based coatings. Background technique [0002] With the continuous advancement of science and technology and the continuous enhancement of people's awareness of environmental protection, water-based coatings have gradually replaced high-pollution and high-waste solvent-based coatings due to their outstanding environmental protection. However, compared with solvent-based coatings, water-based coatings still have many problems, such as slow drying speed of the paint film, low gloss, poor fullness, high VOC emissions, and high overall cost. The main factor affecting the performance of the paint film is the resin used in the paint formulation. At present, the commonly used resins in wate...

AI Technical Summary

Problems solved by technology

However, the various resins disclosed in the prior art, including alkyd resins, still cannot simultaneously solve the problems of slow drying speed, low gloss, poor fullness, high VOC emissions, and high overall cost in water-based coatings.

[0003] Patent CN103224615A discloses an alkyd resin composition and its preparation method. In the technical scheme, the active group is capped by the reaction of benzoic acid and pentaerythritol in the first step, so that the finally formed resin has a high proportion of linear structure, high solid content and low The characteristics of viscosity, but the branching degree of the resin prepared in this way is low, the average molecular weight is low, and the self-drying and curing speed is slow in the process of preparing the paint film, which affects the construction efficiency.

In addition, in the examples provided by this technical solution, the VOC emissions of varnish construction are all above 400g / L, and the VOC emissions of white paint construction are close to 570g / L, which is easy to pollute the environment and endanger health

[0004] Patent CN103435791A discloses an acid-alcohol resin for low-odor coatings and a preparation method thereof. The patent produces an alkyd resin by using alcoholysis of vegetable oil to solve the problem of excessive residual smell of the paint film caused by mixed fatty acids, but the disclosed The test method for alcoholysis depth of vegetable oil and polyol is "alcoholyzate: ethanol = 1:10 (mass ratio)", and the test range is too broad; the alcoholysis process is not strictly controlled, which can easily cause free non-polar substances in the prepared resin. There are too many small molecules of non-toxic vegetable oil, and the paint film prepared by this resin will migrate to the surface of the paint film during the drying process, seriously affecting the quality of the paint film

[0005] Patent CN103554379A discloses a water-based acrylic acid modified alkyd resin and its preparation method. In the technical scheme, in the acrylic acid modification stage, due to the high modification ratio of acrylic acid and acrylate monomers, the solid content of the reaction system is high, so that The molecular weight of the reaction system is extremely large, the viscosity is difficult to control, and the synthesis process is very easy to gel; however, if the solid content in the acrylic acid modification stage is reduced, the solvent content of the finished resin is high, and the VOC of the coating prepared by using this resin is correspondingly high

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