Vacuum insulated panel core material and preparation method thereof and vacuum insulated panel

Abstract

The invention provides a vacuum insulated panel core material, a preparation method thereof and a vacuum insulated panel. The vacuum insulated panel comprises a core material and a gas barrier bag; and the core material is packed in the gas barrier bag in vacuum to prepare the vacuum insulated panel. The core material consists of three raw materials of nanometer gas-phase silicon dioxide with a mass fraction of 60-95%, reinforced viscous fibers with a mass fraction of 3-35% and radiation light screening agents with a mass fraction of 2-10%. The preparation method of the core material prepares the core material through the steps of uniform mixing of the raw materials, molding through pressing, cutting and wrapping of breathable non-woven cloth materials without transmitting powder; and the core material is dried to load in the gas barrier bag for vacuumizing and sealing to prepare the vacuum insulated panel. The core material is low in solid heat conducting coefficient, low in shrinkage rate, low in density and high in strength; and the corresponding vacuum insulated panel is low in heat conducting coefficient, high in strength and long in service life.

Description

technical field [0001] The invention relates to the technical field of thermal insulation materials, in particular to a core material of a vacuum thermal insulation panel, a preparation method thereof, and a vacuum thermal insulation panel. Background technique [0002] With the continuous development of the global industrialization process and the massive consumption of fossil energy, on the one hand, we are facing an energy crisis, and on the other hand, the problem of environmental pollution is becoming more and more serious. Vacuum insulation panel (Vacuum Insulation Panel, referred to as VIP) as a new type of super insulation material, its thermal conductivity is low, only 1 / 5-1 / 10 of the thermal conductivity of traditional insulation materials, excellent comprehensive performance, wide source of raw materials, moderate price, It has been popularized and applied in fields that require high heat insulation, such as refrigerators, cold chain logistics, cold storage, etc.,...

AI Technical Summary

Problems solved by technology

[0004] The production process of glass fiber itself is high energy consumption and high pollution. The core material wet forming process has high energy consumption, large discharge of waste water and waste gas, complex process and high cost.

The fiber dispersion of the dry forming process is uneven, and the performance of VIP, especially the service life, is greatly reduced. In order to suppress the increase in the pressure inside the panel, the glass fiber core material VIP usually uses a barrier bag with good barrier performance and double-sided aluminum foil, which will cause Severe thermal bridge effect makes the overall effective thermal conductivity of VIP rise to 7-10mW / (m K), and the thermal insulation performance is greatly reduced

[0005] Patent CN 102587517B discloses a vacuum insulation panel and its preparation and application. The core material is prepared by mixing nano-silica, multi-scale expanded perlite and chopped fibers in proportion, then pressing and vacuum packaging in aluminum-plastic composite bags. Get VIP, although the cost of this type of VIP is reduced, but because no opacifying agent is added, and the bag containing aluminum foil is used, the thermal conductivity is high, exceeding 10mW / (m K), the thermal bridge effect is large, and the thermal insulation performance is greatly reduced

[0006] Patent CN 102720921B also discloses a method of using expanded perlite to produce vacuum insulation panels. Expanded perlite is used as the main raw material, and various auxiliary materials are added to press to obtain a core material, which is vacuum-packed in an aluminum-plastic composite bag to obtain VIP. In addition to the deficiencies in patent 102587517B, the price of expanded perlite is low, which can reduce the cost of VIP, but the particles of expanded perlite are relatively coarse, and the thermal conductivity of the prepared VIP is very sensitive to the pressure inside the plate, and the thermal conductivity rises quickly. life is short

[0007] Patent CN 105481339A discloses a vacuum insulation board core board for construction and its preparation method, which mixes nano-silica powder, expanded perlite fine powder, reinforcing fiber, inorganic adhesive, flocculant and water to obtain a slurry , and then through sizing, dehydration, shaping, drying and cutting to obtain the core board of vacuum insulation panels for construction. This method is similar to the wet molding of glass fiber core materials. It needs to be made into slurry and then dehydrated and dried. The energy consumption High, large amount of wastewater and waste gas discharge, many process steps and high cost

[0008] The powder core materials used more in China are dry pressed, that is, mechanically stirred, and then pressed into shape. This process is simple to operate and low in cost, but the main problem is that a large amount of dust causes serious pollution to the environment and is inhaled into the human body. Can not be degraded, endanger human health

[0009] Therefore, it is necessary to solve the problems of short service life of VIP, environmental pollution and high cost in the core material production process in the prior art.

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