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A kind of composite core material and its preparation method and application

A composite core and membrane technology, applied in applications, other household appliances, machinery and equipment, etc., can solve the problems of unsuitable large-area building insulation materials, slowing down the flow of water flow, and high rebound rate of vacuum insulation panels. The production process is short, the effect of preventing collapse and uniform density

Active Publication Date: 2022-02-08
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the vacuum insulation panels made of inorganic fiber core materials have a high rebound rate and poor durability. During long-term service, wall bulges will appear to varying degrees, and even the exterior wall finish will fall off, posing certain safety hazards.
[0004] In order to better apply vacuum insulation panels to the field of building energy conservation in my country, Chinese patents CN105970742B and CN104291772B disclose a method for preparing fiber / powder composite insulation materials using a wet forming process, but it requires a long period of drying and drying Drying to reduce the moisture in the insulation material not only consumes a lot of energy, but also is not conducive to energy saving and environmental protection
Chinese patents CN102873959B and CN102717579B disclose a dry method for preparing fiber powder mixed core materials, but it needs to be wrapped in non-woven fabrics to prevent the core material from collapsing, which not only increases labor costs, but also slows down the assembly process. It is also not suitable for the production of large-area building insulation materials
Using the traditional packaging method, a single core material is packed into a single film material, vacuumized and heat-sealed. Although a vacuum insulation panel with a corresponding thickness can be obtained, once it is damaged by external force or affected by humidity, heat, microorganisms and other environmental influences during service , will inevitably lead to a shortened service life, which not only affects the energy-saving effect of the building, but also easily causes other safety problems

Method used

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  • A kind of composite core material and its preparation method and application
  • A kind of composite core material and its preparation method and application
  • A kind of composite core material and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The preparation method of fiber / powder composite core material comprises the steps:

[0048] (1) Mixing of fiber and powder: chopped glass fiber 10 (average diameter 11 μm, average length 6 mm), low melting point nylon fiber 20 (full melting type, initial melting temperature 85 ℃, average length 9 mm) , Fumed silica 30 (hydrophilic type, specific surface area is 200m 2 / g), siliceous filler 40 expanded perlite (bulk density 60kg / m 3 ) and sunscreen 50 carbon black (CTAB adsorption specific surface area is 111.2m 2 / g, the coloring strength is 120.8%) according to the ratio of mass ratio 10:5:45:25:15 into the barrel-shaped container, use the stirring blade to mechanically pre-stir it for 10min, the stirring speed is 800r / min, to obtain fiber / powder mixture;

[0049] (2) Hot press molding of the mixture: put the fiber / powder mixture into a flat metal mold, and press it once with a press. The pressing time is 5min, and the pressurizing pressure is 2.0MPa to obtain a ...

Embodiment 2

[0064] The preparation method of fiber / powder composite core material comprises the steps:

[0065] (1) Mixing of fiber and powder: viscose chopped strands 10 (average diameter 9 μm, average length 6 mm), low-melting polyester fiber 20 (skin-core type, initial melting temperature 110 ℃, average length 5 mm) ), fumed silica 30 (hydrophilic type, specific surface area is 200m 2 / g), siliceous filler 40 expanded perlite (bulk density 60kg / m 3 ), expanded vermiculite (bulk density 180kg / m 3 ) and opacifying agent 50SiC powder (90% purity, 7.5μm average particle size) are poured into a drum-shaped container at a mass ratio of 5:5:40:30:10:10, and mechanically pre-treated by stirring blades. Stir for 5min, the stirring speed is 1800r / min, to obtain the fiber / powder mixture;

[0066] (2) Hot press molding of the mixture: put the fiber / powder mixture into a flat metal mold, and use a press to pressurize it twice in stages. The pressurized pressure is 2.0MPa, the holding time is 5m...

Embodiment 3

[0081] The preparation method of fiber / powder composite core material comprises the steps:

[0082] (1) Mixing of fiber and powder: chopped ceramic fiber 10 (average diameter 6 μm, average length 6 mm), low melting point polyester fiber 20 (full melting type, initial melting temperature 150 ℃, average length 5 mm) ), fumed silica 30 (hydrophilic type, specific surface area is 200m 2 / g), siliceous filler 40 expanded vitrified microbeads (bulk density 180kg / m 3) and opacifying agent 50SiC powder (purity 90%, average particle size 15μm) were poured into a drum-shaped container at a mass ratio of 8:8:34:30:20, and mechanically pre-stirred for 5 minutes with a stirring blade. The stirring speed is 600r / min to obtain the fiber / powder mixture;

[0083] (2) Hot press molding of the mixture: put the fiber / powder mixture into an arc-shaped metal mold, and press it three times with a press. The pressure of pressing is 2.0MPa, the holding time is 5min, the pressure of the second press...

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Abstract

A composite core material and its preparation method and application belong to the technical field of thermal insulation materials. The composite core material prepared by the invention specifically includes chopped strands, low-melting-point fibers, gas-phase silica, siliceous fillers and opacifiers, and is obtained through processes such as mixing, hot pressing and demolding. By using this composite core material, double bag vacuum insulation panels can be produced, including composite core material, getter, inner membrane material, protective layer and outer membrane material, the inner vacuum back-sealed fiber / powder of said inner membrane material Composite core material and getter, the inner membrane material is attached with a protective layer, which is in a vacuum state, and constitutes the core structure of the outer membrane material. The double-bag vacuum insulation panel prepared by applying the composite core material of the present invention not only has good heat insulation and durability, but also has puncture resistance, waterproof and low rebound rate, and is suitable for energy-saving heat preservation and heat insulation fields such as buildings, cold storage, containers and pipelines.

Description

technical field [0001] The invention relates to a composite core material and its preparation method and application, in particular to a fiber / powder composite core material, its preparation method and a double-bag vacuum insulation panel prepared by using the core material, belonging to the technical field of thermal insulation materials. Background technique [0002] As a new type of high-efficiency thermal insulation material, vacuum insulation panels have the advantages of low thermal conductivity, light weight, ultra-thin, fireproof, environmental protection and no pollution. Compared with traditional insulation materials, the thermal conductivity of vacuum insulation panels is only 1 / 5 of that of polyurethane and 1 / 10 of that of rock wool. achieve the same thermal insulation effect. The thickness of the vacuum insulation panel is only 1 / 5~1 / 10 of the traditional insulation material, and it does not use ozone-depleting substances in the production process, does not pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L59/02F16L59/065B29D23/00C04B30/02
CPCF16L59/028F16L59/065C04B30/02B29D23/001C04B14/42C04B14/386C04B16/0691C04B16/0683C04B14/185C04B14/204C04B14/22C04B22/06C04B14/022C04B14/324C04B14/06
Inventor 李承东东为富张胜文
Owner JIANGNAN UNIV
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