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Vacuum heat insulating plate and preparation and application thereof

A technology of vacuum insulation panels and insulation core materials, which is applied in the direction of insulation improvement, climate change adaptation, building components, etc. It can solve the problems of unfavorable environment, high price, and flammability of foaming agents, and achieves easy automatic production and simple preparation process , The effect of low material cost

Inactive Publication Date: 2012-07-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scholars such as Vos et al. (1996), Manini (1999), Malone (1999), Stroobants (2001) prepared vacuum insulation panels with polymer as the core material, but the core material has four disadvantages: 1) High vacuum degree requirement; 2 ) foaming agent is not good for the environment; 3) flammable; 4) it is difficult to achieve high foaming porosity
In 2005, IEA / ECBCS Annex39 conducted research on vacuum insulation panels with fumed silica as the core material. Although the thermal conductivity of the vacuum insulation panel can reach 4mW / m K, its high price limits its wide application. sex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The specific surface area is 100-400m 2 / g of nano-scale silica and particles with a loose packing density of less than 350kg / m 3 The expanded perlite is mixed, and the specific surface area is selected to be 200m2 in this implementation 2 / g of nano-scale fumed silica and particles with a loose packing density of 60kg / m 3 The expanded perlite, the average particle size of the fumed silica is 7-40nm, and the average particle size of the expanded perlite particles is 3 . Put the dried core material into a bag made of a multi-layered aluminum-plastic composite film with a pre-prepared three-side seal and one side for the core material to block gas penetration. When the vacuum degree in the bag is lower than 0.1 Pa, carry out internal decompression sealing to obtain the vacuum insulation panel we need to prepare. The thermal conductivity of the vacuum insulation panel tested by the double-plate method is 10.1mW / m-K (the set temperature of the hot plate is 35°C, and the ...

Embodiment 2

[0031] The specific surface area is 100-400m 2 / g of nano-scale silica and particles with a loose packing density of less than 350kg / m 3 The expanded perlite is mixed, and the specific surface area is selected to be 200m2 in this implementation 2 / g of nano-scale fumed silica and particles with a loose packing density of 72kg / m 3The expanded perlite has an average particle size of 0.03-0.04mm. The mass ratio of fumed silica and expanded pearls is 1: 1.5, mix the two evenly, then add chopped fibrous material, the fibrous material used in this implementation is glass fiber, its length is 7-8mm, gas phase dioxide Silicon: expanded perlite: glass fiber = 10:15:1 (mass ratio). Using the method of Example 1, the maximum pressurized load is 0.45MPa, and the pressure is maintained for 3 minutes. Then the prepared core material was dried in an environment with a temperature of 105°C for 2 hours, and the measured bulk density of the core material was 218kg / m 3 . Put the dry core m...

Embodiment 3

[0033] The specific surface area is 100-400m 2 / g of nano-scale silica and particles with a loose packing density of less than 350kg / m 3 The expanded perlite is mixed, and the specific surface area is selected to be 200m2 in this implementation 2 / g of nano-scale fumed silica, the selected particles have a loose packing density of 326kg / m 3 The expanded perlite, the average particle size of fumed silica is 7-40nm, and the average particle size of expanded perlite is 3 . Put the dry core material into a pre-prepared three-sided seal, one side can be used for the core material to be placed in a bag with a multi-layer structure that can block gas penetration, and when the vacuum in the bag is lower than 0.1Pa, the internal decompression is sealed , to get the vacuum insulation panel we need to prepare. The thermal conductivity of the vacuum insulation panel tested by the double-plate method is 9.1mW / m K (the set temperature of the hot plate is 35°C, and the set temperature of ...

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Abstract

The invention provides a vacuum heat insulating plate and preparation and application of the vacuum heat insulating plate. The vacuum heat insulating plate comprises a heat insulating core material and a film material coating the heat insulating core material. The heat insulating core material comprises nanoscale silicon dioxide and is formed by mixing the nanoscale silicon dioxide with multi-scale expanded perlites and chopped fibers in the weight ratio of 10:5-30:1. The specific surface area of the nanoscale silicon dioxide is 100-400m<2> / g. The incompact stacking density of the multi-size expanded perlites is lower than 350kg / m<3>. The length of the chopped fibers is less than 10mm, and the diameter is less than 20mum. The vacuum heat insulating plate is obtained by uniformly mixing the raw materials, putting the uniformly mixed raw materials into a mold for pressing and molding, taking out the molded core materials, drying the molded core materials to constant weight, putting the core materials into a bag which is prepared from the film material in advance, vacuumizing till the vacuum degree is less than 0.1Pa, and then performing hot sealing. The vacuum heat insulating plate is high in strength and good in heat insulating effect. In this way, the vacuum heat insulating plate is applied to the heat insulation of building walls.

Description

technical field [0001] The invention mainly relates to a preparation method for building thermal insulation materials. In particular, it relates to a preparation method of a vacuum heat insulating board which is light, flame retardant, low in cost, and has a thermal insulation effect 5-10 times that of traditional thermal insulation materials, and which can be used in the construction industry. Background technique [0002] With the rapid development of the economy and the improvement of people's living standards, people's demand for buildings is also increasing. The 21st century is a very large development period of energy consumption, and the problem of high energy consumption in the construction industry is becoming increasingly prominent. The "Energy Conservation Law of the People's Republic of China" implemented in 1998 made provisions on building energy conservation, requiring buildings to improve thermal insulation performance and reduce energy consumption for heatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04B1/80C04B14/18
CPCY02B80/12Y02A30/242Y02B80/10
Inventor 陈惠苏司坤刘琳
Owner SOUTHEAST UNIV
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