Microspherical SiO2 aerogel compound heat-insulating/warm-keeping external wall paint and preparation method thereof

Abstract

The invention discloses microspherical SiO2 aerogel compound heat-insulating / warm-keeping external wall paint and a preparation method thereof. The paint comprises the following components: 1-20 parts by weight of microspherical SiO2 aerogel powder, 10-20 parts by weight of titanium white, 10-20 parts by weight of water-based emulsion, 20-35 parts by weight of filler and 20-30 parts by weight of other paint assistant. According to the invention, the microspherical SiO2 aerogel and the titanium white are compounded, so that the paint has low heat transfer coefficient and high sunlight reflectivity, thus ensuring that the paint has excellent heat-insulating / warm-keeping property; meanwhile, the directly prepared hydrophobic SiO2 aerogel is micron-level microspheres of 1-50 mu m, thus avoiding causing the problems on defoaming and flowability to paint production in the efflorescence process of large aerogel; and the addition of the hydrophobic microspherical SiO2 greatly enhances the brushability of the paint.

Description

technical field [0001] The invention relates to a thermal insulation coating, in particular to a microspherical SiO2 airgel composite thermal insulation exterior wall coating, and also relates to a preparation method of the coating. Background technique [0002] Building energy consumption accounts for 30-40% of human energy consumption, while in developed cities the energy consumed by heating and heating in summer and winter has accounted for 40-50% of the total energy consumption of buildings. Improving the insulation of building envelopes Thermal insulation performance is an important way to reduce building energy consumption and improve building function. In recent years, the method of using energy-saving thermal insulation mortar and thermal insulation coating on the wall of buildings has attracted more and more attention. However, currently commonly used thermal insulation coatings are mostly prepared by using conventional thermal insulation coatings such as sepiolite...

AI Technical Summary

Problems solved by technology

This patent uses silicone resin and aerogel to compound the thermal insulation coating by coating method, but since the liquid resin is easily immersed into the nano-cavities of the aerogel, the overall thermal insulation performance of the coating is reduced

Chinese patent CN102367353A discloses a low thermal conductivity composite thermal insulation coating and its preparation method. The thermal insulation coating is manufactured by curing cross-linked resin. The solvent used is oily, which easily destroys the pore structure of the airgel, thus affecting the thermal insulation performance.

Chinese patent CN102079949A discloses a preparation method of nano-airgel thermal insulation coating, which utilizes SiO 2 The extremely low thermal conductivity of airgel results in a coating film with low thermal conductivity. However, due to the low refractive index and low solar reflectance of airgel, it cannot achieve the effect of external wall heat insulation. At the same time, due to the blocky SiO 2 The density of airgel is low, it is difficult to pulverize, and the size and shape of powdery particles are very irregular, which makes it difficult to adjust the production of coatings

[0005] Chinese patent CN101195725A discloses a heat-insulating and energy-saving paint for vehicles and its preparation method, which uses hydrophilic and oleophobic silica airgel to improve the heat-insulating effect, but this paint is a solvent-based paint with relatively poor environmental protection; and Hydrophilic and oleophobic silica airgel is not easy to disperse, and also needs surface modification. When the coating film is dry, the water vapor in the air easily enters the pores of the hydrophilic airgel, causing the airgel to collapse and lose Low Thermal Conductivity Properties

Chinese patent CN102719129 discloses a preparation method of silica airgel water-based heat-insulating coating, which uses SiO which is internally hydrophobic and externally hydrophilic 2 However, when the surface of hydrophobic silica airgel microspheres is hydrophilically modified using silane coupling agent 3-aminopropyltrihydroxysilane, a certain amount of 3-aminopropyltrihydroxysilane will enter the Silica airgel microspheres react with the pores of the pore walls, reducing the internal hydrophobicity of the airgel, making the nanopore structure of the airgel easily damaged, and affecting the choice of drying methods for the subsequent airgel, and this also increases Reduced the preparation cost of airgel microspheres

Images