Composite emulsion for water-based plastic base paint and preparation method of composite emulsion

Abstract

The invention discloses composite emulsion for water-based plastic base paint and a preparation method of the composite emulsion. The composite emulsion is prepared by blending water-based room temperature self-crosslinked polyacrylate copolymer emulsion with high adhesive force and polyacrylate copolymer emulsion of water-based core-shell structure with high drying speed and high hardness, wherein both the water-based room temperature self-crosslinked polyacrylate copolymer emulsion and the polyacrylate copolymer emulsion of the water-based core-shell structure are emulsion with core-shell structures prepared by adopting a seminal emulsion polymerization method. The raw materials have low price, the synthesis method is simple, the reaction conditions are mild, synthesis of the material can be finished in a reaction vessel, and the method has wide applicability. The composite emulsion for the water-based plastic base paint can have high adhesive force with multiple plastic base materials, and has high drying speed and good paint film performance. The composite emulsion for the water-based plastic base paint can be used for the plastic base materials, can also be used for substances which cannot be baked at a high temperature such as woodenware and the like, and has energy conservation in application and good performance.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a water-based plastic coating, in particular to a composite emulsion for a water-based plastic primer with high adhesion and quick drying and a preparation method thereof. Background technique [0002] Plastic primer coatings are a special category among all current coating products, because plastics are different from metal, building and other surfaces: [0003] (1) There are many kinds of plastic components, and due to the pressure of market competition, in order to reduce costs, many plastic product factories will use various resins to mix and process them into various plastic parts, which makes these plastic parts diverse and complex, and also It has caused great difficulties in the coating of these complex plastic substrates; [0004] (2) The plastic surface often does not have polar groups, and the polarity of the plastic surface has a great impact on the successful ...

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Problems solved by technology

For example, the patent (CN 101421366) discloses a water-based primer composition for polypropylene plastics, which uses unsaturated carboxylic acid or anhydride to modify polyolefin, introduces polar groups, and then uses polyoxyalkylene compounds to modify the composition. It is water-dispersible, and finally mixed with water-based polyurethane and water-based acrylic resin to obtain better water resistance, moisture resistance, gasoline alcohol resistance and initial adhesion. The water-based resin mentioned in this method has more components. , and the structure is very different, so the preparation process is very cumbersome, especially the use of water-based chlorinated polypropylene, which has many steps in the synthesis process of water-based, and the modified substances used such as: poly Oxyethylene stearyl ether, this is a product produced in Japan, but there is no large-scale production in China, so it is not easy to realize industrialization; the patent (CN 101528361A) mentions the "three coatings and one baking" coating process of plastic water-based coatings and the used The water-based primer resins, these resins include: water-based polyolefin and water-based polyacrylic resin as water-based primer, and hydroxyl-containing water-based acrylic resin and water-based polyurethane or water-based polyester resin and melamine resin as water-based primer, and finally One layer is the varnish of the topcoat; the patent (CN 101117479A) mentions the composition of the water-based primer coating and the method of coating, which mentions a system that does not use chlorinated polypropylene as the primer, and the water-based primer mentioned in the system is used The resin is a compound composed of water-based polyurethane resin, water-based epoxy resin, and acrylic particle emulsion with a cross-linked structure inside; the patent (CN 101384676A) reports a resin composition similar to the patent (CN 101421366)

With the development of plastic coating technology, that is, from multi-layer coating to direct use of color paint as a primer for one coating to reduce the problem of excessive coating times; the aforementioned patents contain more resin and synthetic technology. There is a three-time painting process, which will increase the cost of the paint application process, and the operation is complicated

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