Preparation method of porous composite pearlstone heat preservation material

Abstract

The invention belongs to the technical field of heat preservation material preparation and in particular relates to a preparation method of a porous composite pearlstone heat preservation material. Polycrystal alumina fiber is dispersed by using a mixed solution of tolylene diisocyanate (TDI) and water, and bentonite, anti-cracking fiber, polyacrylamide and a hydrophobic agent are added sequentially to prepare a colloid mother solution. Peralstone particles are mixed into the colloid mother solution and stirred evenly, and sticky composite pearlstone slurry is formed. The composite pearlstoneslurry is loaded into a special mold and accounts from 65-100% of space volume. The mold with the slurry is placed in a microwave heating device and heated, sticky slurry state materials in the mold generate gas along with a heated reaction and are expanded to fill an inner cavity of the mold, and liquid substances are gasified and escaped from a gas outlet hole of the mold or turned into solid substances and dried at last to form a composite peralstone heat preservation material section of a porous structure. The preparation method is easy in process, good in scientificalness, low in production cost, easy in obtaining of raw materials, good in product heat preservation performance, light in weight and convenient for popularization and application.

Description

Technical field: [0001] The invention belongs to the technical field of thermal insulation material preparation, and relates to a novel composite structure thermal insulation plate material used in construction occasions, in particular to a preparation method of a porous composite perlite thermal insulation material. Background technique: [0002] Since the promulgation and implementation of Document No. 65 of the Ministry of Public Security in 2011, Class A fireproof exterior wall insulation has been included in the mandatory standards for exterior wall insulation of civil buildings. Due to the withdrawal of Class B fireproof materials, the market has become more interested in exterior wall insulation materials with Class A fireproof standards. There is a great demand; expanded perlite particles are a common non-combustible thermal insulation material. The thermal insulation material based on it has the characteristics of low price, light weight, long-term use without deform...

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Problems solved by technology

The disadvantage of the prior art is that firstly wet compression molding is required, which requires more production equipment and more investment; the wet compression molding process leads to a compact structure of the finished product, although The density is high, and the strength of the finished product is high, but the more important thermal insulation performance of the thermal insulation material is undoubtedly reduced compared with the porous structure; the perlite thermal insulation profiles produced by the prior art mainly rely on the microporous structure of the perlite itself to generate thermal insulation effect

In this way, to achieve the same thermal insulation effect, thicker size, dense structure and thicker size requirements are required, which undoubtedly requires more raw materials, plus more investment in production equipment, and the cost increases; and this technology is also affected by the shape of the mold. Due to the limitations of molding equipment and compression molding equipment, it can only produce products with simple shapes such as flat plates or blocks, and there is a problem that products with complex shapes cannot be directly reached; and the materials after demoulding in a wet state are easily damaged, which reduces the production efficiency, and increased product limitations

In addition, the relatively high density and poor thermal insulation effect of the existing technology bring many shortcomings in the building design, such as shared area, building load, and construction convenience and safety; The method of directly plastering the wall is easily affected by weather factors such as temperature and rainfall before drying, and the construction period and quality after completion; because the slurry carries a lot of water, there are problems such as inconvenient transportation, high cost, and easy freezing in winter, while viscous slurry Insulation profiles coated with other materials either have lower insulation effect under the same thickness, or the cost is too high, which lacks competitiveness, which is purely superfluous

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