Aqueous thick slurry type aliphatic polyurethane floor coating material and preparation method thereof

Abstract

The invention relates to an aqueous thick slurry type aliphatic polyurethane floor coating material and a preparation method thereof, wherein the aqueous thick slurry type aliphatic polyurethane floorcoating material comprises, by weight, 40-48% of a first aqueous polyurethane emulsion, 20-28% of a second aqueous polyurethane emulsion, 3-5% of a pigment, 2-8% of titanium dioxide, 2-15% of precipitated barium sulfate, 1-2% of a hardening wear-resistant aid, 0.3-0.5% of an aqueous dispersant, 0.1-0.2% of an aqueous defoamer, 0.2-0.5% of an aqueous leveling agent, 0.2-0.4% of a surfactant, 0.5-1% of an aqueous polyamide wax slurry, 3.5-6.7% of deionized water, 2-3% of a film forming aid, 2-5 of a cosolvent, and 0.3-0.8% of an amine neutralizing agent. The aqueous thick slurry type aliphaticpolyurethane floor coating material of the present invention has characteristics of fast drying, no foaming during thick coating, good leveling property, high hardness, good wear resistance, good water resistance, good chemical resistance, good weather resistance, low VOCs and the like.

Description

technical field [0001] The invention relates to a water-based thick build aliphatic polyurethane floor coating and a preparation method thereof, belonging to the technical field of coatings. Background technique [0002] With the vigorous improvement of the environment across the country, local governments and various industries have also issued relevant oil ban policies. The China Flooring Association also stipulated that some provinces and cities across the country responded to the call of the local government and banned the use of solvent-based epoxy floor paint and solvents. Type acrylic polyurethane floor paint, but after a period of market verification, there are many construction problems in water-based acrylic polyurethane floor paint, such as: 1. The humidity is too high, the drying is too slow, and the water first reacts with the isocyanate curing agent, so that the resin cannot be well Film formation leads to a series of problems such as low hardness, low gloss,...

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Problems solved by technology

[0002] With the vigorous improvement of the environment across the country, local governments and various industries have also issued relevant oil ban policies. The China Flooring Association also stipulated that some provinces and cities across the country responded to the call of the local government and banned the use of solvent-based epoxy floor paint and solvents. Type acrylic polyurethane floor paint, but after a period of market verification, there are many construction problems in water-based acrylic polyurethane floor paint, such as: 1. The humidity is too high, the drying is too slow, and the water first reacts with the isocyanate curing agent, so that the resin cannot be well Film formation leads to a series of problems such as low hardness, low gloss, poor water resistance, poor wear resistance, and poor adhesion of the paint film; 2. It cannot be thickly coated at one time, and the thickness of a single coating cannot exceed 60 microns (dry film). Otherwise, foaming will occur; 3. Due to the high raw material cost of water-based acrylic polyurethane, the price of floor paint is too high, which is difficult to accept in the market; 4. During the construction process, the construction personnel must use fans to blow around to strengthen the convection of the underground garage. Accelerate the volatilization of water, there is no problem with the garage with a small area, when the area of ​​the garage exceeds 50,000 square meters, it cannot be operated at all

The reasons for the problems of the above-mentioned waterborne acrylic polyurethane floor paint are: 1. Because the water contains -OH, it will react with -NCO in the isocyanate curing agent to produce CO 2 Gas, resulting in long-term non-volatile moisture in humid environments, sacrificing excessive -NCO groups, resulting in poor overall performance of the paint film; 2. It is because of the reaction of -OH and -NCO to generate CO 2 gas, if the paint film is too thick, the internally generated CO 2 The gas cannot be volatilized, resulting in a large number of bubbles in the paint film, so it cannot be thickly coated

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