A kind of high reflectance acrylic polyurethane coating composition

Abstract

The invention relates to a high-reflective acrylic polyurethane coating composition which comprises a component A and a component B in a mass part ratio of 20;3. The component A in 100 parts by mass comprises the following materials in part by mass: 30-50 parts of modified hydroxyl acrylic resin, 2-6 parts of auxiliaries, 35-45 parts of heat reflective pigments, 4-8 parts of aerogel and 10-15 parts of organic solvent. The component B in 100 parts by mass comprises the following materials in part by mass: 75-90 parts of polyisocyanate and 10-25 parts of organic solvent. The modified hydroxyl acrylic resin is obtained by cold-blending modified resin and hydroxyl acrylic resin in a mass part ratio of 1-3: 1; the solid content of the modified hydroxyl acrylic resin is greater than or equals to 75wt%; the particle size of heat reflective pigments ranges from 0.55 micron to 1.2 microns; the particle size of the aerogel ranges from 1 micron to 80 microns; the pore size of the aerogel ranges from 10 nanometers to 20 nanometers; and the heat conductivity coefficient of the aerogel is less than or equals to 0.015W / (m k). The polyisocyanate is one or more of HDI (hexamethylene diisocyanate) biuret, HDI trimer and IPDI (isophorone diisocyanate) trimer curing agents. The high-reflective acrylic polyurethane coating composition is high in reflective insulation quality; and the quantity of VOC (volatile organic compounds) of the high-reflective acrylic polyurethane coating component is low.

Description

technical field [0001] The invention relates to a high reflectivity acrylic polyurethane coating composition. Background technique [0002] Solar energy is a necessary condition for human survival and life, but strong radiation also brings many problems and inconvenience to industrial production and daily life. With the advent of a conservation-minded society and the aggravation of the global warming effect, materials with the ability to reflect solar heat and passive radiative cooling have attracted increasing attention. Especially on the outer surface of tanks and equipment such as chemical industry storage tanks and liquefied natural gas (LNG) storage tanks, if there is no protection of heat-reflective insulation materials, it will not only cause energy loss, but also may cause serious fires and explosions and other security incidents. Among the heat-reflecting and heat-insulating materials, the solar heat-reflecting coating is a simple and effective energy-saving mater...

AI Technical Summary

Problems solved by technology

Chinese patents CN 101205435A and CN1583908A respectively disclose a solar heat reflective heat-insulating coating and a preparation method thereof. The purpose of heat-insulating reflection is achieved by using an undercoat chlorosulfonated polyethylene insulation layer and a topcoat thermoplastic heat-reflective coating. The resins used are all thermoplastic resins, which have poor outdoor aging resistance and low solid content of the resin, resulting in large VOC emissions from the entire supporting system.

Chinese patent CN1800283 discloses a heat-insulating coating and its application, which uses nanoporous SiO 2 and nano-iron oxide yellow to prepare colored heat-insulating reflective coatings, which have high heat reflectivity and good thermal insulation performance. The resins used are conventional polyester polyurethane resins, acrylic polyurethane resins and other systems. Although these resin systems are more outdoor aging than thermoplastic resins Good, but its disadvantage is that the solid content is generally not high, a lot of VOC is introduced and all nano pigments are used, the particle size is small, the reflection of light waves in the visible light region is large, and the reflection in the near infrared region will be weakened, heat The reflection effect will be reduced accordingly

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