A kind of silica sol/acrylate nano core-shell composite emulsion and preparation method thereof

Abstract

The invention relates to a silica sol / acrylate nano core-shell compound emulsion and a preparation method thereof. The preparation method comprises the following steps: (1) performing titanium chelation treatment on nano silica sol: mixing 0.1-2 parts by weight of tetrabutyl titanate and 0.2-4 parts by weight of carboxyl compound to form a complex, and adding into 100-150 parts by weight of nano silica sol; and (2) preparing the compound emulsion: a, performing seed emulsion polymerization; and b, performing shell monomer polymerization. According to the invention, the titanium chelation treatment is performed on the nano silica sol, and an environment-friendly reactive emulsifier and an acrylate monomer are subjected to in-situ polymerization on the surfaces of nano silicon dioxide particles in the present of an initiator, thus forming a nano core-shell structure taking silicon dioxide as the core and an acrylate copolymer as the shell; and the compound emulsion particles have small particle size and high coating rate. The emulsion production process is simple, low in cost, favorable in stability and high in silicon content; measured by the amount of the silicon dioxide, the silicon content accounts for 30-50wt% of the total solid content; and a coated film is transparent, high in gloss and high in hardness, and has favorable water resistance, heat resistance, acid / alkali resistance and other properties.

Description

technical field [0001] The invention relates to a high-performance, low-cost novel environment-friendly nano-core-shell composite emulsion, which can be widely used in various coating fields, and particularly relates to a silica sol / acrylate nano-core-shell composite emulsion and a preparation method thereof. Background technique [0002] Inorganic / organic nanocomposite emulsion is a hot spot in the research of coating film-forming substances in recent years. Due to the introduction of rigid inorganic components, the hardness of the film is greatly improved, and it can overcome the "hot stickiness and cold brittleness" of simple polymers, poor UV aging resistance, etc. There are many shortcomings, and the water resistance, acid and alkali resistance, stain resistance and scrub resistance of the coating film have also been greatly improved. Due to the characteristics of nanoparticles such as surface effect, volume effect, quantum size effect, and macroscopic quantum tunneling...

AI Technical Summary

Problems solved by technology

Although the composite emulsion uses a small amount of alkyl alcohol solvent to inhibit the hydrolysis of silanol, and saves the cumbersome steps of silica sol surface coupling treatment, there are still many shortcomings, such as the particle size of the composite latex is too large, with a diameter of 150-200nm , the maximum silicon content does not exceed 10%, failing to maximize the characteristics of nanomaterials and the role of cost reduction

[0006] At present, the high performance and various characteristics of the silica sol / polyacrylate composite emulsion have demonstrated advantages in the field of emulsions, and have become a hot spot in the development of new composite emulsions. The research on the surface treatment of silica sol has also received great attention, but now The coupling technology mainly using silane coupling agent still fails to solve the problems of nano-silica agglomeration and surface graft copolymerization. High, good stability, simple process, green environmental protection, low cost, excellent performance and other advantages

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