Metal surface heat reflection heat insulation type waterborne polyurethane finishing coat and preparation method thereof

Abstract

The invention relates to the technical field of coatings, and discloses a metal surface heat reflection and heat insulation type waterborne polyurethane finishing coat, which comprises a component A and a component B. The component A comprises, by weight, 170-190 parts of purified water, 4-6 parts of a wetting agent, 12-14 parts of dispersing agent, 2-3 parts of a defoamer, 580-630 parts of water-based resin, 100-120 parts of infrared reflection pigment CICP, 12-20 parts of heat insulation powder, 20-30 parts of filler, 4-6 parts of a leveling agent, 4-6 parts of other auxiliaries and 35-45 parts of a cosolvent. The component B comprises the following components in parts by weight: 70-80 parts of a waterborne polyurethane curing agent and 20-30 parts of propylene glycol diacetate, and theweight ratio of the component A to the component B is 5: 1 or 6: 1. The coat has the advantages of favorable weather resistance, favorable temperature change resistance, favorable water resistance, favorable chemical resistance and favorable color retention property. The surface temperature of a coating system can be effectively controlled due to the sunlight reflection and heat insulation capabilities, and the storage stability, the construction performance and the like of the coating can be further improved due to the addition of the functional additive with reflection, heat insulation, environmental protection and energy conservation effects.

Description

technical field [0001] The invention relates to the technical field of reflective and heat-insulating coatings for metal surfaces, and particularly discloses a heat-reflecting and heat-insulating water-based polyurethane topcoat for metal surfaces and a preparation method thereof. Background technique [0002] With the advancement and improvement of national policies and the needs of the new era, new materials, environmentally friendly materials, fireproof materials, green energy materials, and reusable materials in the field of steel structure anticorrosion and weather resistance are constantly being removed and updated. Therefore The requirements for this industry are getting higher and higher, and various high-performance and even functional coatings have emerged. In view of this, our company has developed a heat-reflective and heat-insulating water-based polyurethane topcoat for metal surfaces (hereinafter referred to as water-based polyurethane topcoat). Water-based po...

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Problems solved by technology

[0003] Patents CN106280600A, CN111690312A, and CN109401597A disclose water-based polyurethane topcoats and their preparation processes, which have single functions, poor weather resistance, and cannot achieve the function of reflective heat insulation

Patent CN 107760156A discloses a heat-insulating reflective coating. The coating has poor weather resistance with water-based epoxy resin, and the functional filler used has poor heat-insulating and reflective effect and cannot make the coating film plump and bright.

Patent CN108977018A discloses a heat-insulating water-based polyurethane topcoat for ships. This coating only uses a small amount of heat-insulating additives to reflect its heat-insulating function, which makes it poor in blocking solar radiation. Greatly reduces the effect of paint reflection heat insulation, short function duration and no reflection function

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