A kind of plant polysaccharide thermal insulation airgel material and preparation method

Abstract

The invention relates to a plant polysaccharide heat insulation aerogel material and a preparation method. The plant polysaccharide heat insulation aerogel material is composed of starch, konjac glucomannan, auxiliary glue, glycerin, straws, nano calcium carbonate, chitosan and acetic acid according to a certain ratio. The preparation method comprises the following steps: (1) dissolving chitosan into an acetic acid solution, and stirring at a room temperature to obtain a solution A; (2) adding glycerin into deionized water, adding starch, konjac glucomannan, auxiliary glue, straws and inorganic fillers, and uniformly stirring to obtain a solution B; (3) mixing the solution A and the solution B to obtain a solution C, and stirring the solution C under the condition of 60-90 DEG C so as to obtain transparent viscous gel; (4) homogenizing the stirred transparent viscous gel, pouring the viscous gel into a mold, and cooling into gel; (5) performing freeze drying. The aerogel is excellent in mechanical property, has a low heat conductivity coefficient and can be applied to building insulation boards, mobile house walls and refrigerator insulation layers. The raw materials and aerogel are biodegradable, and the whole production process is green and pollution-free.

Description

Technical field[0001]The invention belongs to a natural thermal insulation material of biopolymer-based aerogel, and more specifically relates to a specific thermal insulation aerogel of konjac polysaccharide, and also relates to a preparation method of thermal insulation aerogel of konjac polysaccharide.Background technique[0002]The economy of modern society is developing rapidly, and the ecological environment is deteriorating. Since the 1970s, after the oil crisis in the West, mankind has begun to focus on energy conservation. Energy consumption in the construction field is large. One of the means of building energy conservation is the use of building insulation materials. Reduce floor space and reduce energy consumption. At present, most of the materials on the market for thermal insulation walls are organic thermal insulation materials, mostly polystyrene boards and polyurethane materials. EPS has relatively low thermal conductivity, and has excellent characteristics such as wa...

AI Technical Summary

Problems solved by technology

At present, most of the materials used for thermal insulation walls on the market are organic thermal insulation materials, mostly polystyrene boards and polyurethane materials. EPS has relatively low thermal conductivity, and has excellent characteristics such as waterproof and high strength, so it has a wide range of applications. However, organic thermal insulation materials also have many defects: these materials will pollute the environment during the production and processing of raw materials, cost high, pollute the environment, waste resources and are extremely flammable and easy to cause fires

However, the raw materials of current insulation materials are non-renewable, and most of the materials after production are non-degradable. Therefore, it is difficult to decompose when the materials are discarded after use. Some toxic gases are produced during combustion, which pollutes the environment. human bodily harm

In recent years, airgel prepared by supercritical drying method has appeared, which has excellent high temperature resistance and has been used in the aerospace field. However, most of the aerogels currently use petroleum as a precursor. Due to excessive exploitation by humans, Petroleum resources are limited, the production process is complicated, and the cost is high. The resources are limited, the cost is high, the toxicity is high, and the degradation is difficult

Images