Preparation method of silica aerogel reflecting heat-insulation exterior wall coating

Abstract

The invention belongs to the technical field of functional coatings, and particularly relates to a preparation method of a silica aerogel reflecting heat-insulation exterior wall coating. The silica aerogel reflecting heat-insulation exterior wall coating comprises water A, rutile type titanium dioxide, a silica aerogel precursor, pigments and fillers, a leveling agent, a dispersing agent, a preservative, a defoaming agent, styrene-acrylic emulsion, elastic emulsion, silicone modified acrylic emulsion, a coalescing agent, a thickening agent and a pH regulator. The preparation method comprisesthe steps of mixing materials orderly and then grinding the mixture to obtain the silica aerogel reflecting heat-insulation exterior wall coating. Compared with a traditional reflecting heat-insulation coating, the reflecting heat-insulation coating prepared from formula materials by the method in the invention is quite excellent in reflecting heat-insulation property and has the advantages of lowproduction cost and environmental protection.

Description

[0001] This application is a divisional application of the Chinese invention patent with the patent application number 201710368264.6 (application date: May 23, 2017, patent name: a silicon airgel reflective heat-insulating exterior wall coating and its preparation method). technical field [0002] The invention belongs to the technical field of functional coatings, in particular to a silica airgel reflective heat-insulating exterior wall coating for industrial and building energy conservation and a preparation method thereof. Background technique [0003] In recent years, industrial and building energy conservation has attracted widespread attention at home and abroad, and energy-saving coatings have developed rapidly. Traditional reflective heat insulation coatings for building exterior walls or industrial light component storage tanks mostly use glass microspheres, hollow glass microspheres, and hollow ceramic microspheres as active ingredients to achieve the purpose of re...

AI Technical Summary

Problems solved by technology

However, due to the existence of microbeads, this coating has the following defects: 1. Due to the shielding effect of other components in the coating, the reflection and heat insulation effect of the microbeads is affected; It is prone to increase in viscosity and floating of microbeads, and the product is not easy to store and construct; 3. Microbeads are hard materials, easy to break, and the heat insulation rate is unstable; 4. In order to avoid damage to microbeads, the production and construction process cannot be completely in accordance with The production of traditional architectural coatings is low in efficiency and difficult; 5. The paint film of this kind of reflective heat-insulating coating is thick, the coating surface is rough, the decoration is poor, and the cost is higher than ordinary coatings; 6. The compactness of the paint film Poor, resulting in poor water resistance and poor stain resistance of the paint film

However, due to the existence of airgel powder, this coating has the following defects: 1. Airgel powder is made by supercritical drying process under high temperature and high pressure. Its production conditions are harsh, the process is complicated, and it is dangerous. The investment in the production equipment is large, the preparation efficiency is low, and the raw materials for its preparation are mainly high-priced silanols, and the production cost is high; 2. The airgel powder has the characteristics of light weight, is not easy to disperse in the coating, and is easy to gather on the upper part of the coating And produce stratification phenomenon, and then produce island effect, affect the heat insulation performance of coating; Siphon effect, it is very easy to absorb the organic matter in the raw materials for coating preparation and then block the pores, thus making it lose the heat insulation performance

[0005] The Chinese patent whose publication number is CN102719129A discloses a kind of preparation method of silica airgel water-based thermal insulation coating, the SiO after drying 2 Airgel microspheres are added to water-based coatings to prepare composite thermal insulation coatings, due to SiO 2 Drying of airgel microspheres requires the use of supercritical CO 2 Drying, complex preparation process, high requirements for equipment, and greatly increased cost; in addition, the patent mainly focuses on heat insulation, and does not conduct research and analysis on the reflection performance of the material, and its reflection performance needs to be improved

[0006] The Chinese patent with the publication number CN104497688A discloses an airgel thermal insulation coating and a preparation method thereof. The coating prepared by the method has a relatively thick dry film thickness under the condition that the dry film thickness is 5mm, resulting in high use cost; in addition , the patent mainly focuses on heat insulation, and does not conduct research and analysis on the reflective performance of the material, and its reflective performance needs to be improved

[0007] Due to the shortcomings of the above materials, the application of reflective insulation coatings in industry and construction is greatly limited

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