Airgel modified cotton fiber vacuum insulation panel core material and preparation method thereof

Abstract

An airgel modified cotton fiber vacuum insulation board core material and a preparation method thereof belong to the technical field of thermal insulation materials. The formulation of the invention includes 80-99 parts by weight of airgel, 1-20 parts of cotton fiber and 0-20 parts of polymer; the thickness of the core material is less than or equal to 1.0mm, and the pore size is 100-1000nm. The airgel is prepared from one or more alkoxysilanes as the main raw material through hydrolysis-polycondensation and radiation curing reactions, and is formed by interlacing Si-C-O network and Si-O-Si network Organic-inorganic nanohybrid materials. The present invention utilizes sol-gel and radiation cross-linking technology to rapidly solidify the wet gel, which can not only finely design and regulate the pore structure of the airgel, but also quickly extract the gas molecules in the pores of the core material and make it difficult to conduct heat. It can greatly improve the strength, toughness, thermal insulation performance and service life of the vacuum insulation panel, and is very suitable for cold chain, construction, pipeline, ship and ocean engineering and other fields.

Description

technical field [0001] The invention relates to an airgel modified cotton fiber vacuum insulation board core material and a preparation method thereof, belonging to the technical field of thermal insulation materials. Background technique [0002] With the rapid development of the economies of various countries, the world's energy crisis and environmental degradation have emerged as the times require. The use of thermal insulation materials can significantly reduce energy consumption and is a major measure to achieve sustainable development of the global economy. In recent years, the requirements for heat insulation, heat preservation, cold preservation and energy saving from various industries are increasing year by year. The thermal conductivity of commonly used thermal insulation materials, such as rock wool and perlite, is mostly higher than 20mW / (m·K), and the thermal insulation performance is mediocre, which has become increasingly difficult to meet the current high s...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the above disadvantages, to provide an airgel modified cotton fiber vacuum insulation board core material and its preparation method, which utilizes radiation to trigger rapid crosslinking of colloidal particles, shortens the preparation cycle, and simultaneously sol- Gel technology and radiation cross-linking technology (the reaction mechanism is shown below), using radiation to trigger rapid cross-linking of reactive organic groups in the wet gel, to finely design and control the microstructure of airgel, improve the simple The airgel prepared by sol-gel technology or radiation cross-linking technology has a single defect in structure and performance, which endows the core material with high strength, high toughness and multifunctionality (such as hydrophobic, optical, thermal, acoustic, magnetic , electricity, chemical resistance), making its vacuum insulation panels have advantages in thermal insulation fields such as cold chain, construction, pipeline, shipbuilding and marine engineering

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