CN116423736A - Bonding method of vacuum insulation board of refrigerator - Google Patents

Bonding method of vacuum insulation board of refrigerator Download PDF

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Publication number
CN116423736A
CN116423736A CN202310450458.6A CN202310450458A CN116423736A CN 116423736 A CN116423736 A CN 116423736A CN 202310450458 A CN202310450458 A CN 202310450458A CN 116423736 A CN116423736 A CN 116423736A
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China
Prior art keywords
vacuum insulation
bonding
foaming
refrigerator
insulation board
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CN202310450458.6A
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Chinese (zh)
Inventor
江峰
李婷婷
刘鹏
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Changhong Meiling Co Ltd
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Changhong Meiling Co Ltd
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Priority to CN202310450458.6A priority Critical patent/CN116423736A/en
Publication of CN116423736A publication Critical patent/CN116423736A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/04—Making preforms by assembling preformed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
    • C08G18/4018—Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
    • C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
    • C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
    • C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/125—Water, e.g. hydrated salts
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C08J9/141—Hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • C08J9/143—Halogen containing compounds
    • C08J9/144—Halogen containing compounds containing carbon, halogen and hydrogen only
    • C08J9/146—Halogen containing compounds containing carbon, halogen and hydrogen only only fluorine as halogen atoms
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2101/00—Manufacture of cellular products
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2110/00—Foam properties
    • C08G2110/0083—Foam properties prepared using water as the sole blowing agent
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
    • C08J2203/142—Halogenated saturated hydrocarbons, e.g. H3C-CF3
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04—Polyurethanes

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Refrigerator Housings (AREA)

Abstract

The application provides a bonding method of a vacuum insulation board of a refrigerator, which comprises the following steps: adhering one side of the condensing tube to an aluminum foil plate by using an adhesive tape; placing an aluminum foil plate attached with a condensing tube at the bottom of a foaming mold, and attaching a vacuum heat insulation plate to the other side of the condensing tube; after the vacuum insulation board is spliced, spraying foaming materials in the accommodating groove of the vacuum insulation board; the foaming material comprises isocyanate and polyether polyol, wherein the volume ratio of the isocyanate to the polyether polyol is 1:1; and after foaming and expanding, adhering the vacuum insulation board to a side plate of the refrigerator through an adhesive. The foaming material has the advantages that the components of the foaming material are improved, the bonding performance of the material can be improved, and the foaming reaction can be carried out more quickly, so that the problem of foaming layering in the bonding process of the vacuum insulation board of the refrigerator is solved.

Description

Bonding method of vacuum insulation board of refrigerator
Technical Field
The application relates to the technical field of household appliances, in particular to a bonding method of a vacuum insulation board of a refrigerator.
Background
The VIP plate, which is called as vacuum insulation panel in English, is manufactured based on the vacuum insulation principle, and achieves insulation conduction by maximally improving the vacuum degree in the plate and filling a core layer insulation material, so that the purposes of heat preservation and energy conservation are achieved. Because the vacuum insulation board has low heat conductivity coefficient, small volume and environmental protection, the vacuum insulation board is widely applied to the refrigerator industry.
The refrigerator keeps warm through the mode of adding the vacuum insulation board in the foaming layer, and the mounting means of vacuum insulation board adopts more and directly bonds the vacuum insulation board on the curb plate of the refrigerator of installing the condenser pipe, but because there is great space between vacuum insulation board and the condenser, inside can exist the air and can't get rid of after the bonding foaming, the problem that the foaming layering influences the refrigerator life-span appears.
Disclosure of Invention
The application provides a bonding method of a vacuum insulation board of a refrigerator, which aims to solve the problem of foaming delamination in the bonding process of the vacuum insulation board in the refrigerator.
The application provides a bonding method of a vacuum insulation board of a refrigerator, which comprises the following steps: adhering one side of the condensing tube to an aluminum foil plate by using an adhesive tape;
placing an aluminum foil plate attached with a condensing tube at the bottom of a foaming mold, and attaching a vacuum heat insulation plate to the other side of the condensing tube;
after the vacuum insulation board is spliced, spraying foaming materials in the accommodating groove of the vacuum insulation board; the foaming material comprises isocyanate and polyether polyol, wherein the volume ratio of the isocyanate to the polyether polyol is 1:1;
and after foaming and expanding, adhering the vacuum insulation board to a side plate of the refrigerator through an adhesive.
In one possible implementation, the isocyanate is one or a combination of more of a diphenylmethane polyisocyanate, diphenylmethane-4, 4-diisocyanate.
In one possible implementation, the foaming material comprises the diphenylmethane polyisocyanate and diphenylmethane-4, 4-diisocyanate in a mass ratio of 7:3.
In one possible implementation, the polyether polyol is one or a combination of more of sucrose, sorbitol, polyether mixture, polyester mixture.
In one possible implementation, the foaming material comprises the polyether mixture and the polyester mixture, and the mass ratio of the polyether mixture to the polyester mixture is 6.5:3.5.
In one possible implementation, the aluminum foil sheet has a thickness of 0.2 to 0.4mm.
In one possible implementation, the aluminum foil plate is degreased and cleaned before one side of the condenser tube is attached to the aluminum foil plate by using an adhesive tape, and is placed in an oven at 30-50 ℃ for drying.
In one possible implementation, the adhesive is one or more of epoxy resin, phenolic resin, urea resin, polyurethane, polyvinyl acetal, perchloroethylene resin, neoprene, nitrile rubber.
In one possible implementation, before the vacuum insulation panel is adhered to the side plate of the refrigerator by an adhesive, the method further includes: and bonding a layer of release paper with the thickness of 0.12-0.20 mm on the other side of the aluminum foil plate through an adhesive.
In one possible implementation, the height of the mold is greater than the height of the vacuum insulation panel, and the height difference between the mold and the vacuum insulation panel is 3-15mm.
According to the technical scheme, the application provides a bonding method of a vacuum insulation board of a refrigerator, which comprises the following steps: adhering one side of the condensing tube to an aluminum foil plate by using an adhesive tape; placing an aluminum foil plate attached with a condensing tube at the bottom of a foaming mold, and attaching a vacuum heat insulation plate to the other side of the condensing tube; after the vacuum insulation board is spliced, spraying foaming materials in the accommodating groove of the vacuum insulation board; the foaming material comprises isocyanate and polyether polyol, wherein the volume ratio of the isocyanate to the polyether polyol is 1:1; and after foaming and expanding, adhering the vacuum insulation board to a side plate of the refrigerator through an adhesive. The foaming material has the advantages that the components of the foaming material are improved, the bonding performance can be better increased, the foaming reaction is faster, the foaming material is more suitable for bonding, and the problem of foaming layering in the bonding process of the vacuum insulation board of the refrigerator is effectively relieved.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a flowchart of a method for bonding a vacuum insulation panel of a refrigerator according to an embodiment of the present disclosure;
fig. 2 is a schematic bonding diagram of a vacuum insulation panel of a refrigerator according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the present application. Merely as examples of systems and methods consistent with some aspects of the present application as detailed in the claims.
The vacuum insulation panel mainly comprises high-permeability kraft paper bags, adsorbents, aluminum film coating plastic sheet containers, special powder (such as pearlitic sand) and other raw materials. The outer layer of the vacuum insulation board can be a plastic bag with an aluminum film coating, the inner layer is a packaging bag with good air permeability, and special powder is contained in the packaging bag. Wherein, the powder mainly plays a role of heat insulation in a vacuum state after the air in the bag body is pumped out; the powder contained in the kraft paper bag must ensure good air permeability, so that the gas contained in the powder is pumped out, the powder is not dispersed, and the adsorbent is used for adsorbing the residual air and other gases contained in the bag, so as to ensure good vacuum performance and heat insulation performance in the bag body; the plastic sheet container with aluminum film coating mainly comprises a thermal solid solution layer, a gas barrier layer, a surface layer and other novel composite materials, thereby playing roles in thermal capacity sealing pressure, anti-radiation and the like. In addition, the residual gas pressure in the vacuum insulation board is required to be in the range of 1.36-136 Pa, so that special powder is ensured to form a flat plate layer under the action of internal and external pressure differential compression, and the ideal heat insulation effect is exerted.
The heat conductivity coefficient of the vacuum heat insulation plate is in the interval range of 0.0047-0.007W/m DEG K, and the heat insulation performance of the vacuum heat insulation plate is 3-4 times that of the polyurethane heat insulation layer. The heat transfer coefficient of the vacuum insulation panel is determined by the radiation of powder, gas, contact heat conduction and the volume ratio of the powder, so that the distance between the space partition walls can be effectively shortened by filling the vacuum space with the porous heat insulating material, the vacuum degree is reduced, and the average free path of gas molecules is higher than the powder spacing, thereby reducing the air heat conduction effect. Meanwhile, because the gas is separated in innumerable tiny spaces by the powder flat plate layers, the heat quantity flowing in the vacuum insulation plate is low, and when the diameter of the air hole is lower than 4mm, the heat quantity flowing to the box body by the gas is negligible. Meanwhile, the powder in the partition wall space can effectively enhance radiation scattering and reflecting effects, so that radiation heat flow is reduced, and the heat preservation performance of the box body is improved. Therefore, compared with the refrigerator body using the polyurethane heat insulation layer, the vacuum heat insulation plate has more excellent heat insulation effect. Because the vacuum insulation board has low heat conductivity coefficient, small volume and environmental protection, the vacuum insulation board can be applied to the refrigerator industry.
The vacuum insulation board is installed in a plurality of assembly modes, and the vacuum insulation board can be fixed in the side board area of the refrigerator by means of the supporting clamp aiming at the installation of the small-size vacuum insulation board, and the vacuum insulation board is positioned in the middle of the foaming layer after the foaming installation is carried out on the refrigerator.
In one possible implementation mode, the bonding surface of the vacuum insulation board is grooved, and a groove which is 20mm wide, 4-7 mm thick and penetrates through the whole VIP board in length is formed at the position corresponding to the condenser pipe and is used for avoiding the condenser pipe. The bonding surface is normally provided with pressure-sensitive adhesive and release paper, and the condenser pipe is clamped at the slotting position during bonding and then is subjected to pressing treatment.
The above-mentioned installation method of the vacuum insulation panel has a risk of misalignment of adhesion, thereby causing formation of a side plate trace, resulting in rejection. And the surface film material of the vacuum insulation board is easy to damage, the ventilation risk is increased once every time the vacuum insulation board is folded, 4 folds are formed in one groove, and the air leakage risk is increased by more than 10 times every time the groove is formed, so that the air leakage risk is greatly increased.
Therefore, the assembly method is only suitable for small-size vacuum insulation panels, and when the method is used for supporting large-size vacuum insulation panels, the problem of cavitation quality caused by uneven foaming or insufficient flow is very easy to occur.
Considering that the vacuum insulation panels used in multi-door refrigerators are mostly large in size (e.g., 1250X 450X 10 mm), it is necessary to perform bonding work on the vacuum insulation panels.
In some embodiments, the refrigerator mounts the vacuum insulation panel in the following manner: the vacuum insulation boards are adhered to the flat side boards or the flat back board on the two sides of the refrigerator. In the assembly process, the vacuum insulation board is firstly subjected to hot melt adhesive spraying, then is stuck with the refrigerator side plate, and finally is subjected to pressing operation. And after the refrigerator liner is assembled, the foaming process is carried out, and the manufacture of the refrigerator body can be completed. One surface of the vacuum insulation board is provided with pressure sensitive adhesive, and a layer of release paper is coated on the surface of the vacuum insulation board, and when the vacuum insulation board is used, the release paper is torn and then stuck to a corresponding position.
Because the side plates of some refrigerators are provided with 4-8 rows of condensing pipes, if the vacuum heat insulation plates are directly adhered to the side plates with the condensing pipes, the quality problems of unstable adhesion of the vacuum heat insulation plates, foaming holes of the side plates and the like can occur because of larger gaps between the vacuum heat insulation plates and the condensers.
In order to solve the problems, the application provides a bonding method of a vacuum insulation board of a refrigerator, which avoids the problems of the bonding method of the vacuum insulation board of the refrigerator.
As shown in fig. 1, the method for bonding a vacuum insulation panel of a refrigerator provided by the application comprises the following steps:
step 1: adhering one side of the condensing tube to an aluminum foil plate by using an adhesive tape;
the condenser tube is required to be fixed to the aluminum foil plate before the vacuum insulation panel is installed. Wherein the thickness of the aluminum foil plate is 0.2-0.4mm.
In order to facilitate the installation of the vacuum insulation board, a transparent sub-grid force board or glass is used for semi-sealing (namely, the side edges and the top are closed, and the material inlets and outlets are reserved at the two ends and are not closed) in the installation process of the vacuum insulation board, and a tungsten lamp or an air conditioner is used for controlling the temperature in the transparent sub-grid force board or glass.
When the side plate is molded on the production line, the semi-closed aluminum foil pasting process is carried out, the aluminum foil pasting process can be carried out by adopting automatic equipment, heating treatment is carried out at the inlet and the middle position of the process, and the side plate is heated when entering the process, so that the reaction temperature is ensured to be within the range of 45-55 ℃.
An aluminum foil plate with the thickness of 0.2-0.4mm is tiled, the aluminum foil tape for the condenser tube is attached to the aluminum foil plate, and the position and the mode are consistent with those of the attaching state of the side plate.
The aluminum foil adhesive tape is adhered to the surface of the condensing tube for fixing the condenser, and meanwhile, the heat dissipation area of the condensing tube is enlarged, the heat dissipation effect is improved, and in one possible implementation mode, the diameter of the condensing tube is 3-6 mm.
Step 2: placing an aluminum foil plate attached with a condensing tube at the bottom of a foaming mold, and attaching a vacuum heat insulation plate to the other side of the condensing tube;
the aluminum foil plate with the condensing tube is placed at the bottom of the foaming mold, then the vacuum heat insulation plate is placed on the condensing tube, the position and the bonding state of the side plates are consistent, then the mold is closed, in order to ensure the normal foaming reaction, in one possible implementation method, the length and width directions of the mold size are slightly wider than those of the VIP plate, 5-20mm is reserved at the upper, lower, left and right positions, and the height direction of the mold is 3-15mm higher than the total height.
Step 3: after the vacuum insulation board is spliced, spraying foaming materials in the accommodating groove of the vacuum insulation board; the foaming material comprises isocyanate and polyether polyol, wherein the volume ratio of the isocyanate to the polyether polyol is 1:1; after curing for a period of time, the mold is opened and removed.
After the side plate is stuck with the condensing tube, spraying a layer of polyurethane foaming material at the position where the vacuum heat insulation plate is required to be stuck, using the expansion characteristic of polyurethane foaming to achieve the effect of filling the condensing tube into the flat polyurethane foaming material, then using the sticking effect of the polyurethane foaming material to place the vacuum heat insulation plate on the foaming material, and pressing the vacuum heat insulation plate to achieve the effect of flatly sticking the vacuum heat insulation plate on the side plate with the condensing tube. Because the polyurethane foaming material has good adhesion, the pressure sensitive adhesive and surface release paper can be removed from one side of the vacuum insulation board.
The polyurethane foam may consist of: the polyurethane foam comprises a material A isocyanate (specifically crude MDI, namely, diphenylmethane polyisocyanate), a material B polyether polyol (ether substances such as sucrose, sorbitol and the like), a physical foaming agent (cyclopentane, 245fa, 134a, LBA and the like), a chemical foaming agent (water) and an additive (silicone oil and the like).
Because the polyurethane foaming material is required to be fully mixed with A, B components and then react to form filling and bonding effects, the polyurethane foaming material is fully mixed and then injected into a foaming mold, and the reaction is completed within 45-60 seconds under the condition of 40-55 ℃ of the foaming mold. Because the polyurethane raw material reaction requires a long time to complete, the long reaction time can cause the reduction of the installation efficiency of the vacuum insulation panel; and the adhesion is affected due to the overlong reaction time of the polyurethane raw material, so that the adhesion of the vacuum insulation panel is not firm.
The polyurethane raw materials are therefore optimized in order to increase the reaction time of the polyurethane raw materials, and in one possible implementation, the isocyanate is one or a combination of more of a diphenylmethane polyisocyanate, diphenylmethane-4, 4-diisocyanate. Wherein the mass ratio of the diphenylmethane polyisocyanate to the diphenylmethane-4, 4-diisocyanate is 7:3. In one possible implementation, the polyether polyol is one or a combination of more of sucrose, sorbitol, polyether mixture, polyester mixture. Specifically, the mass ratio of the polyether mixture to the polyester mixture is 6.5:3.5.
By adding diphenylmethane-4, 4-diisocyanate into isocyanate, the activity of the material A can be improved, the reaction intensity and speed can be increased, the reaction is more intense in unit time, more heat is released, the reaction speed is further promoted, and the reaction time is shortened. By adding 35% polyether into the polyether polyol of the material B, the toughness and the bonding strength of the foam can be enhanced, and the bonding performance can be improved. Because the physical foaming agent absorbs heat and gasifies during the reaction, the bonding of the vacuum insulation board and the rapid completion of the reaction are not facilitated, and the reaction speed can be improved after the physical foaming agent is eliminated. Through the optimization, the polyurethane foaming material achieves better bonding performance and faster reaction speed, and is more suitable for bonding.
In the foaming process of spraying foaming materials in the accommodating groove of the vacuum insulation board, the temperature of the die is 18-22 ℃, and the ambient temperature is 20-25 ℃.
The temperature of the raw materials of the polyurethane foaming material can be controlled between 18 ℃ and 22 ℃, and the temperature of the mould is controlled between 45 ℃ and 55 ℃. The vacuum insulation panel provided in the above embodiment is mounted in such a manner that it is bonded after spraying and is foamed in an open type, so that it is difficult to control the temperature of the mold to 45-55 ℃. In order to control the raw material temperature to 45-55 ℃, in one possible implementation, the die temperature is controlled to 18-22 ℃ and the ambient temperature is controlled to 20-25 ℃, so that the reaction speed is improved.
In order to ensure the polyurethane raw materials to fully react, an electrostatic spraying method or a plasma spraying method is adopted to spray the foaming material into the accommodating groove of the vacuum insulation board, wherein the spraying time is 5-10 s.
In one possible implementation, when spraying is performed by a plasma spraying method, the distance between spray guns is 100-150 mm, the air pressure is 0.4-0.7 MPa, and the moving speed of the spray guns is 250-310 cm/s.
The powder needs to be heated and accelerated in the plasma flame flow for a period of time, so that a proper spraying distance is needed, the spraying distance is too short, the coating quality is affected due to poor powder heating and insufficient impact deformation, the substrate is severely oxidized due to the influence of the plasma flame flow, and meanwhile, the substrate is too high in temperature rise to cause thermal deformation. Too far a spray distance will cool the powder that has been heated to a molten state when it comes into contact with the part, the flight speed will also start to decrease, the coating quality will also be affected, and the spray efficiency will be significantly reduced. The distance between the spray guns is thus chosen in this application to be 100-150 mm.
The effect of the spray gun movement speed on the coating quality and the spray efficiency is not obvious within a certain range. The slow and fast speed of movement of the spray gun or the relative speed of the spray gun and the workpiece at a certain powder feeding amount means how much of the area of the workpiece or the thickness of each sprayed layer the spray gun sweeps through in unit time, so that the speed of movement of the spray gun is adjusted to control the thickness of each sprayed layer in practice. The thickness of each spray should not be too thick. In some embodiments, each spray coating has a thickness of less than or equal to 0.25mm, and for coatings requiring a spray coating thickness of 0.25mm, two or more spray forming steps are also contemplated. In addition, the moving speed of the spray gun has influence on the temperature rise of the workpiece, and the faster moving speed of the spray gun is selected on the premise of ensuring coverage so as not to cause thermal deformation or overlarge thermal stress due to overhigh local temperature rise of the substrate. Therefore, the moving speed of the spray gun can be selected to be 250-310 cm/s.
In one possible implementation, the substrate is sprayed at a temperature of 15-20 ℃ when plasma spraying is used.
The temperature of the base metal is an important parameter in the spraying process. Most workpieces are preheated to remove moisture and activate the surface prior to spraying, which facilitates bonding of the coating to the substrate and controls thermal expansion of the substrate relative to the coating. For some thin-wall parts, the stress caused by inconsistent shrinkage of parts and the coating during cooling after spraying can be reduced, so that the combination of the coating and a substrate is facilitated. Preheating before spraying can also reduce the reduction of the fatigue resistance of the part after spraying. However, when the preheating temperature of the metal part exceeds 200 ℃, severe oxide films start to appear on the surface of the part, resulting in a significant decrease in the bonding strength of the coating.
Too high and too low a temperature can affect the drying process of the coating. The temperature is too high, the solvent volatilizes too fast, and a dry spraying mode can appear during spraying; the activation time of the two-component paint is short, and the viscosity of the paint rises and dries quickly, so that the paint is scrapped; the coating is easy to generate abnormal skin chapping, wrinkles, pinholes, bubbles and the like. The temperature is too low, the fluidity of the coating is poor, the coating is coarse and has poor compactness, the intersolubility of each component of the coating is poor, the viscosity of the coating is increased or the coating is locally separated out, and the defects of particles or pinholes are easy to cause. The substrate temperature of the spray coating is thus chosen in the present application to be in the range 18 to 25 ℃.
Step 4: after the foaming material is reacted and expanded, the vacuum insulation board is adhered to the side plate of the refrigerator through an adhesive. In one possible implementation, the adhesive is one or more of epoxy resin, phenolic resin, urea resin, polyurethane, polyvinyl acetal, perchloroethylene resin, neoprene, and nitrile rubber.
According to the preparation method, the raw materials of the polyurethane foaming material are optimized, so that the bonding performance and the reaction speed of the foaming material are improved; and through the control to raw materials temperature, material temperature and ambient temperature, make the vacuum insulation board laminate on the curb plate that has the condenser pipe, effectively alleviate the problem of foaming layering in the vacuum insulation board bonding process of refrigerator.
Example 1
An aluminum foil plate with the thickness of 0.2-0.4mm is taken and paved, an aluminum foil tape for a condensing tube is attached to the aluminum foil plate, the position and the mode are consistent with those of the attaching state of the side plate, and a tungsten filament lamp or an air conditioner is adopted for semi-sealing by using a transparent sub-grid force plate or glass for temperature control. After the aluminum foil is attached, a foaming material spraying procedure is carried out, after a side plate is in place, positioning is carried out for 1.5 seconds, and then an automatic nozzle is used for spraying a layer of polyurethane foaming material at a position corresponding to the vacuum insulation plate, wherein the foaming material comprises isocyanate and polyether polyol, the volume ratio of the isocyanate to the polyether polyol is 1:1, and the isocyanate is the diphenylmethane polyisocyanate and the diphenylmethane-4, 4-diisocyanate with the mass ratio of 7:3; the polyether polyol is a polyether mixture and a polyester mixture, and the mass ratio of the polyether mixture to the polyester mixture is 6.5:3.5. When the plasma spraying method is adopted for spraying, the distance between spray guns is 160mm, the air pressure is 0.4MPa, the time for spraying foaming materials is 5s, and the moving speed of the spray guns is 300cm/s. When the plasma spraying method is adopted for spraying, the temperature of a sprayed substrate is 18 ℃, and the ambient temperature is controlled to be 25 ℃.
And after the polyurethane foaming material is sprayed, starting to react, and after the foaming material is reacted and expanded, adhering the vacuum insulation board to a side plate of the refrigerator through an adhesive, wherein the adhering completion schematic diagram is shown in fig. 2.
From the above embodiments, the present application provides a method for bonding a vacuum insulation panel of a refrigerator, including: adhering one side of the condensing tube to an aluminum foil plate by using an adhesive tape; placing an aluminum foil plate attached with a condensing tube at the bottom of a foaming mold, and attaching a vacuum heat insulation plate to the other side of the condensing tube; after the vacuum insulation board is spliced, spraying foaming materials in the accommodating groove of the vacuum insulation board; the foaming material comprises isocyanate and polyether polyol, wherein the volume ratio of the isocyanate to the polyether polyol is 1:1; and after foaming and expanding, adhering the vacuum insulation board to a side plate of the refrigerator through an adhesive. The foaming material has the advantages that the components of the foaming material are improved, the bonding performance of the material can be improved, and the foaming reaction can be carried out more quickly, so that the problem of foaming layering in the bonding process of the vacuum insulation board of the refrigerator is solved.
The foregoing detailed description of the embodiments is merely illustrative of the general principles of the present application and should not be taken in any way as limiting the scope of the invention. Any other embodiments developed in accordance with the present application without inventive effort are within the scope of the present application for those skilled in the art.

Claims (10)

1. A method for bonding a vacuum insulation panel of a refrigerator, comprising:
adhering one side of the condensing tube to an aluminum foil plate by using an adhesive tape;
placing an aluminum foil plate attached with a condensing tube at the bottom of a foaming mold, and attaching a vacuum heat insulation plate to the other side of the condensing tube;
after the vacuum insulation board is spliced, spraying foaming materials in the accommodating groove of the vacuum insulation board; the foaming material comprises isocyanate and polyether polyol, wherein the volume ratio of the isocyanate to the polyether polyol is 1:1;
and after foaming and expanding, adhering the vacuum insulation board to a side plate of the refrigerator through an adhesive.
2. The method for bonding a vacuum insulation panel of a refrigerator according to claim 1, wherein the isocyanate is one or more combinations of diphenylmethane polyisocyanate and diphenylmethane-4, 4-diisocyanate.
3. The method for bonding a vacuum insulation panel of a refrigerator according to claim 2, wherein the foaming material comprises the diphenylmethane polyisocyanate and diphenylmethane-4, 4-diisocyanate, and the mass ratio of the diphenylmethane polyisocyanate to the diphenylmethane-4, 4-diisocyanate is 7:3.
4. The method of bonding a vacuum insulation panel of a refrigerator according to claim 1, wherein the polyether polyol is one or more of sucrose, sorbitol, polyether mixture, polyester mixture.
5. The method of claim 4, wherein the foaming material comprises the polyether mixture and the polyester mixture, and the mass ratio of the polyether mixture to the polyester mixture is 6.5:3.5.
6. The method of bonding a vacuum insulation panel of a refrigerator according to claim 1, wherein the aluminum foil plate has a thickness of 0.2 to 0.4mm.
7. The method for bonding a vacuum insulation panel of a refrigerator according to claim 6, wherein before attaching one side of the condensation duct to the aluminum foil panel with an adhesive tape, the aluminum foil panel is degreased and cleaned, and is dried in an oven at 30-50 ℃.
8. The method for bonding a vacuum insulation panel of a refrigerator according to claim 1, wherein the adhesive is one or more of epoxy resin, phenolic resin, urea resin, polyurethane, polyvinyl acetal, perchloroethylene resin, neoprene, nitrile rubber.
9. The method of bonding a vacuum insulation panel of a refrigerator according to claim 8, wherein before bonding the vacuum insulation panel to a side panel of the refrigerator by an adhesive, the method further comprises: and bonding a layer of release paper with the thickness of 0.12-0.20 mm on the other side of the aluminum foil plate through an adhesive.
10. The method of bonding a vacuum insulation panel of a refrigerator according to claim 9, wherein the height of the mold is greater than the height of the vacuum insulation panel, and the difference in height between the mold and the vacuum insulation panel is 3 to 15mm.
CN202310450458.6A 2023-04-23 2023-04-23 Bonding method of vacuum insulation board of refrigerator Pending CN116423736A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310450458.6A CN116423736A (en) 2023-04-23 2023-04-23 Bonding method of vacuum insulation board of refrigerator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310450458.6A CN116423736A (en) 2023-04-23 2023-04-23 Bonding method of vacuum insulation board of refrigerator

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Publication Number Publication Date
CN116423736A true CN116423736A (en) 2023-07-14

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