Acrylate emulsion and application thereof in aluminum powder paint

Abstract

The invention relates to an acrylate emulsion and application thereof in aluminum powder paint. The preparation method of the acrylate emulsion comprises the following steps: adding 20-40 parts of deionized water, 0.2-0.4 part of a nonionic emulsifier and 0.5-0.9 part of an anionic emulsifier into a four-neck flask, and then adding two thirds of a core monomer mixed solution and an initial initiator aqueous solution; then, dropwise adding the remaining core monomer mixed solution and the initiator aqueous solution at the same time, and then dropwise adding N-N dimethylethanolamine until the pH is equal to 6; adding a shell monomer mixed solution and a shell initiator aqueous solution; sequentially adding an aqueous solution of tert-butyl hydroperoxide and an aqueous solution of sodium sulfite, and finally adding 0.3-0.8 part of N-N dimethylethanolamine to adjust the pH value to 7.5-8, thereby obtaining the product. The phosphate ester resin is used for wrapping the oily aluminum powder, the process is simple and convenient, the cost is low, the wrapping property is good, the prepared coating is good in stability, hydrogen is not generated or little hydrogen is generated after long-term storage, tank expansion is avoided, the metallic feeling is excellent after spraying, and good corrosion resistance is provided for the aluminum powder coating.

Description

technical field [0001] The invention relates to an acrylate emulsion and its application on aluminum powder paint. Background technique [0002] Aluminum powder paint is widely used in steel structures, rail transit, automobiles, electronic products and other fields because of its metallic texture, color-dependent effect, and anti-corrosion properties; in recent years, with the strengthening of environmental protection, the water-based aluminum powder paint The development has become a hot spot, but the water-based aluminum powder paint has the following disadvantages: 1. Poor storage stability, aluminum silver paste reacts with water to produce hydrogen gas, which causes the tank to bulge; 2. Poor orientation of water-based aluminum powder leads to metallic texture and angular heterochromatic effect 3. The cost of water-based aluminum-silver paste is much higher than that of oil-based aluminum-silver paste, which makes water-based aluminum powder paint expensive; these shor...

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Problems solved by technology

[0002] Aluminum powder paint is widely used in steel structures, rail transit, automobiles, electronic products and other fields because of its metallic texture, color flop effect, and anti-corrosion properties; In recent years, with the strengthening of environmental protection, the development of water-based aluminum powder paint has become a hot spot, but water-based aluminum powder paint has the following disadvantages: 1. Poor storage stability, aluminum silver paste reacts with water to produce hydrogen gas, which causes the tank to bulge; 2. Water-based aluminum powder paint Poor alignment of powder leads to deterioration of metal texture and color flop effect, and darkening of coating film surface, which fails to achieve the expected effect; 3. The cost of water-based aluminum-silver paste is much higher than that of oil-based aluminum-silver paste, resulting in the price of water-based aluminum powder paint Expensive; these disadvantages will affect the popularization and application of water-based aluminum powder paint

[0003] Patent: CN 108047834A discloses a kind of easy orientation, high-performance fluoro-silicon composite water-based aluminum powder paint and its preparation method, which adopts silicon-acrylic emulsion, fluorocarbon emulsion and The preparation of water-based aluminum-silver paste provides an easy-to-orientation, high-performance fluorine-silicon composite water-based aluminum powder paint that is environmentally friendly, stable, reduces VOC emissions, and the aluminum powder can be well oriented during construction. However, the fluorine-silicon composite emulsion The price and cost are much higher than conventional emulsions, making users discouraged; patent: CN 105385271 A discloses a one-component acrylic metal glitter paint and its preparation method, which has excellent decorative properties, good weather resistance and construction, and outstanding Low VOC environmental protection, suitable for the coating of automobiles and construction machinery, the biggest disadvantage of one-component acrylic emulsion is that its hardness, water resistance, alkali resistance, adhesion, corrosion resistance and other properties are far inferior to two-component acrylic emulsion, and its heat The sticky, cold and brittle phenomenon is also a common problem of one-component acrylic emulsion; patent: CN 106565893 A discloses a water-based styrene-acrylic emulsion and its preparation method for bottom-surface-integrated metal paint, which uses polymerization reaction to graft phosphate ester functional monomers Added to acrylic latex ions, the prepared metal coating has a good complexation with metal ions, and its coating film has excellent water resistance, salt water resistance and salt spray resistance, good gloss and hardness. It is a simultaneous Water-based styrene-acrylic emulsion for metal paints that takes into account the performance requirements of primers and topcoats. Because this type of styrene-acrylic emulsion is a one-component emulsion, its weather resistance is poor, it cannot be used outdoors for a long time, and its hardness is not as good as two-component acrylic lotion

[0004]The existing water-based aluminum powder paint can only meet some performance requirements, and it is difficult to achieve excellent overall performance; the use of water-based aluminum-silver paste requires complicated preparation process and high price;

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