CN103316629A

CN103316629A - Composite getter for vacuum insulated plate and preparation method thereof

Info

Publication number: CN103316629A
Application number: CN2013102853470A
Authority: CN
Inventors: 钟翔
Original assignee: NANJING ZHONGSHAN ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: NANJING ZHONGSHAN ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2013-07-08
Filing date: 2013-07-08
Publication date: 2013-09-25

Abstract

The invention provides a manufacturing method of a composite getter for a vacuum insulated plate. The composite getter for the vacuum insulated plate comprises zeolite and a drying agent layer, wherein the zeolite is placed in the drying agent layer, or the composite getter comprises the zeolite, a metal carrier and the drying agent layer, wherein the drying agent layer can package the zeolite in the metal carrier. In preparation, the zeolite is placed at the center, and a drying agent covers the zeolite to be pressed for forming, or the zeolite and the drying agent are arranged in the metal carrier, wherein the zeolite is arranged at the bottom layer, and the drying agent is arranged at the upper layer. The zeolite is placed after being activated in vacuum, or the zeolite can be activated in vacuum after being packaged in the metal carrier with the drying agent. The product after forming is subjected to vacuum preservation or vacuum package, or can be preserved or packaged under inert gas.

Description

Vacuum heat-insulating plate composite getter and preparation method thereof

Technical field

The present invention relates to a kind of vacuum heat-insulating plate with the manufacturing of composite getter, can be applied in and absorb gas in the vacuum heat-insulating plate, keep vacuum.

Background technology

Along with growth in the living standard, people are more and more to the demand of freezing insulation.Use at low temperature storage transportation and refrigeration household appliances industry inside thermal conservation material is more and more extensive.Simultaneously along with energy crisis, energy-conservationly become a worldwide problem.Vaccum thermal insulation technique is a kind of very efficiently insulation method.Its primary structure is a vacuum heat-insulating plate (Vacuum Insulation, Panel, be called for short VIP), this plate outer surface is adiabatic film, there are core and drier and getter in inside, and inside is vacuum state, like this so that the factor of gas molecule heat conduction be eliminated, thereby make adiabatic effect be much better than other heat-insulating materials, its heat transfer efficiency is 1/3 to 1/10 of conventional insulation material.External VIP technology has developed for many years, and we still are in the stage at the early-stage at this domestic technology.

By adiabatic principle as seen, the vacuum in the VIP plate is adiabatic key factor.The principal element that affects vacuum is the continuous infiltration of gas in the use procedure, and the continuous release gas of internal material, all can cause the decline of vacuum.Therefore, the use of drier and getter becomes extremely important.

In present VIP production technology, the VIP plate is finished product after the vacuum sealer encapsulation and dispatches from the factory.Along with passage of time, constantly have gas molecule to infiltrate inner, and the air release in the internal material is out, vacuum descends gradually, makes VIP plate thermal conductivity factor rise the final products life termination.If therefore in the plate getter is housed, in the future greatly prolonged in the VIP life-span.

Present getter is mainly the product of import, and its main material composition is that becket inside is filled to the barium lithium alloy, and barium lithium alloy outside is drier.And no matter present domestic getter is evaporable barium aluminium getter or non-evaporable zirconium class getter, and a common feature is arranged, need to be in being installed to user's device after, activated at.Temperature reaches more than 400 degree usually, and is high even surpass 1000 degree, because the material of VIP plate, this temperature is impossible realize in the production process of VIP plate.

And the barium lithium alloy is a kind of activated degasser of exempting from, and need not activated at, in the VIP plate of only need packing into, can reach inspiratory effects.Barium lithium getter mainly absorbs nitrogen, oxygen, carbon dioxide.But, using the getter that contains the barium lithium material, it can reaction produce hydrogen after meeting water, and the possibility of burning is arranged.This product just once appearred using in Japan, the breaking out of fire in removal process of waste product wherein, and this safety and environment bring the accident of harm.

And zeolite is widely used industrial.Mainly be because this class mineral crystal has and opens very much spacious silica screen work, form uniform duct, many apertures and the very large hole of inner surface at crystals, thereby have unique performances such as absorption, screening, ion-exchange and catalysis.Why zeolite can adsorb other materials in a large number, mainly is to be determined by his internal structure of uniqueness.After the water in the zeolite screen work is removed, form the very large hole of internal surface area, can store a large amount of molecules.Zeolite can be strong adsorbed water, methyl alcohol, ethanol and can not adsorb ethane, acetone and benzene fully, namely have the characteristic of selective absorption.

Silica gel, activated alumina and active carbon all do not have fixing uniform pore size, pore diameter range alters a great deal, pore size such as silica gel does not wait from 10～1000A, the aperture of activated alumina is between 10～10000A, therefore sized molecules all can enter the duct and is adsorbed, therefore do not have sieve performance, namely do not have selectivity.Zeolite has high efficiency of additive capability, particularly the senior property molecules such as H2O, NH3, H2S, CO2 is had very high affinity.Especially to water, even under the unfavorable conditions such as low relative humidity and low concentration, high temperature, still can adsorb.Zeolite has high efficiency of additive capability, particularly the senior property molecules such as H2O, NH3, H2S, CO2 is had very high affinity.Especially to water, even under the unfavorable conditions such as low relative humidity and low concentration, high temperature, still can adsorb.

Summary of the invention

Getter of the present invention; using on the zeolite base just; increase other drier that use domestic maturation; and produce in a vacuum; this getter behind the Kaifeng is (in 10 minutes, this time is sealed off getter to putting required maximum duration in the VIP plate when being the production of VIP plate) in of short duration exposure air; owing to stopping of desiccant layer, can protect zeolite not contact with air molecule.

Vacuum heat-insulating plate composite getter of the present invention comprises zeolite layer and desiccant layer, and zeolite places the inside of desiccant layer.The desiccant layer that has wrapped up getter can also be placed in the metallic carrier that does not seal.As long as have at least a suction face to expose.

Another kind of scheme is, described vacuum heat-insulating plate comprises zeolite layer, a metallic carrier and desiccant layer with composite getter, and desiccant layer is encapsulated in zeolite layer in the metallic carrier.Compressing in a vacuum, vacuum storage or encapsulation also can be that inert gas stores or encapsulation.

Described drier is selected from silica gel, calcium oxide, alkaline earth oxide, metal oxide, sulfate, chloride and bromide drying material or mixture wherein.

Vacuum heat-insulating plate composite getter of the present invention, its mesolite can absorb the gases such as nitrogen, carbon dioxide, organic gas, and drier can the adsorbed water steam.

Vacuum heat-insulating plate of the present invention with the preparation process of composite getter is:

1) with degassed in the zeolite powder vacuum heat treatment furnace;

2) in the vacuum argon filling glove box that zeolite is compressing, again with reshaping (Fig. 1) behind the drier 2 parcel getters;

Or in carrier 3, will in the vacuum argon filling glove box, put into by compressing zeolite powder 1, recharge again compacting (Fig. 2) behind the drier 2; Or in the vacuum argon filling glove box, the zeolite powder 1 of packing into first in carrier 3 reinstalls drier 2 rear compressing (Fig. 3).

3) composite getter vacuum storage or the vacuum packaging after the compacting also can be to store under inert gas or packing.

Another kind method is, first according to above-mentioned steps 2) after the method moulding, again product is placed vacuum heat treatment degassed.And then vacuum storage or vacuum packaging.

Description of drawings

Fig. 1 is vacuum heat-insulating plate one of composite getter structural representation.

Fig. 2 is two of vacuum heat-insulating plate usefulness composite getter structural representation.

Fig. 3 is three of vacuum heat-insulating plate usefulness composite getter structural representation.

The 1-zeolite, 2-drier, 3-carrier.

The specific embodiment

Embodiment 1

As shown in Figure 1, zeolite powder is packed in the vacuum furnace, be evacuated down to 10-2Pa after, be heated to 800 degree, be incubated 5 minutes.Applying argon gas is come out of the stove behind the cool to room temperature, is pressed into sheet 1 in vacuum argon filling hand glove box, again drier 2 lime powders is surrounded the zeolite powder sheet, is pressed in glove box.And plastic packaging machine encapsulates getter in glove box.

Get a packaged getter, be put in the air 10 minutes after the opening, this time is during simulation VIP plate is produced, to seal off getter to the used maximum duration of VIP plate of packing into.Afterwards getter being put into testing board suction nitrogen ability is 3.PaL/mg.

Embodiment 2

As shown in Figure 2, zeolite powder is packed in the vacuum furnace, be evacuated down to 10-2Pa after, be heated to 800 degree, be incubated 5 minutes.Applying argon gas is come out of the stove behind the cool to room temperature, is pressed into sheet 1 in vacuum argon filling hand glove box, puts into metallic carrier 3, again drier 2 lime powders is filled carrier 3, is pressed.With plastic packaging machine getter is encapsulated in the glove box.

Get a packaged getter, be put in the air 10 minutes after the opening, afterwards getter being put into testing board, to inhale the nitrogen ability be 3.PaL/mg.

Embodiment 3

As shown in Figure 3, zeolite powder is packed in the vacuum furnace, be evacuated down to 10-2Pa after, be heated to 800 degree, be incubated 5 minutes.Applying argon gas is come out of the stove behind the cool to room temperature, with zeolite powder 1, puts into metallic carrier 3 bottoms at vacuum argon filling hand glove box, and the above is put the drier 2 calcium oxide muffins that are pressed in advance muffin again, is pressed.In vacuum glove box, with plastic packaging machine getter is encapsulated again.

Get a packaged getter, be put in the air 10 minutes after the opening, after getter is put into testing board to inhale the nitrogen ability is 3.PaL/mg.

Claims

1. a vacuum heat-insulating plate composite getter comprises zeolite and desiccant layer, it is characterized in that placing desiccant layer inner in zeolite, or comprises zeolite, metallic carrier and desiccant layer, and desiccant layer is encapsulated in zeolite in the metallic carrier.

2. composite getter as claimed in claim 1 is characterized in that described zeolite is the mixture of a kind of composition or multiple zeolite.

3. composite getter as claimed in claim 1 is characterized in that drier is selected from: a kind of in silica gel, calcium oxide, alkaline earth oxide, metal oxide, sulfate, chloride and the bromide or they mixture.

4. composite getter as claimed in claim 1 is characterized in that placing desiccant layer inner in zeolite, and the desiccant layer outer surface places a metallic carrier that does not seal.

5. the preparation method of a vacuum heat-insulating plate usefulness composite getter is characterized in that, step is as follows:

1). zeolite powder or particle High Temperature Pre in vacuum drying oven is processed, in the vacuumizing casing that zeolite is compressing, again the drier powder is covered behind the outside again compressing; The metallic carrier inside of perhaps zeolite being packed into, the above covers the drier powder pressing forming;

2) this product after the moulding is carried out vacuum storage or packing, or under inert gas, store or packing.

6. the preparation method of a vacuum heat-insulating plate usefulness composite getter is characterized in that, step is as follows:

1) in the vacuumizing casing that zeolite is compressing, again the drier powder is covered behind the outside again compressing; The metallic carrier inside of perhaps zeolite being packed into, the above covers the drier powder pressing forming;

2) product that step 1) is compressing carries out high-temperature process in vacuum drying oven; Then vacuum storage or packing.