Preparation method of hydroxyl acrylate emulsion for waterborne wood paint

Abstract

The invention discloses a preparation method of a hydroxyl acrylate emulsion for waterborne wood paint. The method comprises the following steps: using a core-shell synthesis technique, firstly generating a soft core with very small particle size by adopting microemulsion polymerization, and then polymerizing a layer of hard shell with a room-temperature self-crosslinking function; wherein the hydroxyl-containing function can be uniformly or emphatically distributed in the core and the shell layer as required, and the monomer composition of the shell layer contains a proper amount of functional monomer diacetone acrylamide capable of carrying out room-temperature self-crosslinking and is matched with adipic dihydrazide to carry out room-temperature self-crosslinking; the obtained product has the characteristics of small particle size, high transparency, good polishability, good hardness and good tolerance, and is suitable for being used as single-component or double-component wood paint, especially varnish primer.

Description

technical field [0001] The invention relates to the field of synthesis and preparation of polymer materials, in particular to a preparation method of a hydroxyacrylic acid emulsion product applied to water-based wood lacquer. Background technique [0002] With the increasingly stringent restrictions on the VOC content in coatings by environmental regulations in various countries, water-based coatings are an inevitable development trend of wood coatings, especially in recent years. Promoted the development of synthetic resins for waterborne wood coatings. Water-based wood paint is made of acrylic emulsion. The resulting paint is non-toxic, non-combustible, convenient and safe for construction, and fast drying. More and more attention has been paid to it. But in many cases, there are various problems, among which the more difficult problem is to achieve relatively high permeability and good sandability at the same time, especially for two-component hydroxyacrylic emulsion pro...

AI Technical Summary

Problems solved by technology

But in many cases, there are various problems, among which the more difficult problem is to achieve relatively high permeability and good sandability at the same time, especially for two-component hydroxyacrylic emulsion products , it is more difficult to achieve both easy sanding and good permeability to be suitable for sandable varnish primer

The common practice is to reduce the solid content (~30%) to achieve both the permeability of the wood paint. If the solid content is too low, the solid content of the finished paint will be low and the covering power will be weak. There are many problems such as thickening difficulty

The sandability cannot be achieved by increasing the Tg alone, because increasing the Tg and increasing the hardness is not very effective. Too hard a paint film is not easy to polish, and if the Tg is too high, the minimum film forming temperature MFFT is also increased, and it becomes necessary to increase the Tg. If the amount of film-forming aids is large, there will be problems of VOC exceeding the standard