CN110698714A - Heat preservation foaming system based on heat preservation refrigerator - Google Patents
Heat preservation foaming system based on heat preservation refrigerator Download PDFInfo
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- CN110698714A CN110698714A CN201910949041.8A CN201910949041A CN110698714A CN 110698714 A CN110698714 A CN 110698714A CN 201910949041 A CN201910949041 A CN 201910949041A CN 110698714 A CN110698714 A CN 110698714A
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- 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
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- 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
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
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- 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
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3218—Polyhydroxy compounds containing cyclic groups having at least one oxygen atom in the ring
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- 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
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3271—Hydroxyamines
- C08G18/3278—Hydroxyamines containing at least three hydroxy groups
- C08G18/3281—Hydroxyamines containing at least three hydroxy groups containing three hydroxy groups
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- 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
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- 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
- C08G2110/0025—Foam properties rigid
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- 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
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- Chemical Kinetics & Catalysis (AREA)
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- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Refrigerator Housings (AREA)
Abstract
The invention discloses a heat-preservation foaming system based on a heat-preservation refrigerator, which comprises a simulation module, wherein the simulation module calculates the heat conductivity coefficient of polyurethane, and a foaming system is developed according to the obtained heat conductivity coefficient of the polyurethane, and the foaming system comprises 100 parts of white material, 25-32 parts of foaming agent, 1-3 parts of foaming auxiliary agent and 150 parts of black material and 165 parts of black material according to the following mass fractions. According to the heat preservation foaming system based on the heat preservation refrigerator, the foaming system with high heat preservation performance is developed according to the heat preservation performance so as to meet the requirements of the refrigerator with small size and large volume, the cost increase caused by the use of the vacuum heat insulation plate is reduced, the working procedures are reduced, the heat preservation performance required by the foaming system of the refrigerator body can be predicted through heat load simulation analysis, compared with the existing working process of firstly developing and then verifying, the repeated test verification is greatly reduced, and the time cost and the labor cost are saved.
Description
Technical Field
The invention belongs to the technical field of refrigerators and relates to a heat-preservation foaming system based on a heat-preservation refrigerator.
Background
The refrigerator is an indispensable electrical appliance for families, foaming is an important link in refrigerator production, and the foaming quality directly determines the heat preservation performance and the supporting strength of the refrigerator. With the development of refrigerators, large-volume refrigerators are becoming more popular, and the same large-volume refrigerators are becoming larger. In order to solve the problem of large volume caused by large volume, a vacuum insulation panel (VIP panel for short) with better heat insulation performance is used in a foaming layer of a plurality of large-volume refrigerators, so that the thickness of the foaming layer is reduced, the volume of the large-volume refrigerator is reduced, and the refrigerator with small volume (namely small occupied area) and large volume is obtained.
Therefore, the thickness of the refrigerator body is about 75mm originally, and after the vacuum heat insulation plate is adopted, the thickness of the refrigerator body can be reduced to about 50mm, so that the volume ratio of the refrigerator is greatly increased. However, the use of vacuum insulation panels also brings other disadvantages, and firstly, the surface of the vacuum insulation panel is wrapped by aluminum foil paper so as to avoid scratching and damage. In the actual transportation and operation process, the damage is avoided, and the rejection rate is high; secondly, the vacuum insulation panel has higher price and cost, and the vacuum insulation panel and the foaming foam have the same volume, and the price of the vacuum insulation panel is higher than 10 times, so the cost control is not very beneficial.
Therefore, the thermal insulation performance required by the foaming layer of the refrigerator body when the vacuum thermal insulation plate is not used can be calculated through thermal load simulation, and a proper polyurethane foaming system is developed according to the thermal insulation performance, so that the vacuum thermal insulation plate is omitted, and the requirements of the refrigerator with small volume and large volume are met.
Disclosure of Invention
The invention aims to provide a heat preservation foaming system based on a heat preservation refrigerator, which is characterized in that the heat preservation performance required by a foaming layer of a refrigerator body when a vacuum heat insulation plate is not used is calculated by utilizing heat load simulation analysis, and then a foaming system with high heat preservation performance is developed according to the heat preservation performance so as to meet the requirements of the refrigerator with small volume and large volume and solve the problem of cost and process increase caused by the use of the vacuum heat insulation plate.
The purpose of the invention can be realized by the following technical scheme:
a heat preservation foaming system based on a heat preservation refrigerator comprises a simulation module;
the simulation module is a foaming system which is developed by adopting a heat-preservation heat load simulation model or utilizing a heat load simulation model to calculate the heat conductivity coefficient of polyurethane and according to the obtained heat conductivity coefficient of the polyurethane.
Thermal load simulation model: the polyurethane foam heat conductivity coefficient, the average thickness of the box body, the internal and external temperatures of the box body and the area of each surface are input, so that the overall heat load of the box body can be obtained, and the formula is as follows: q ═ λ × sxΔ t/d, where: q is a thermal load, lambda is the heat conductivity coefficient of the polyurethane foam and the vacuum insulation panel, S is the area of each surface of the box body, d is the average thickness of the box body, and delta t is the temperature difference between the inside and the outside of the box body;
when the Q value is set to be unchanged, the thickness d2 of the new polyurethane foam and the area S2 of the new polyurethane foam are changed, the temperature delta t inside and outside the box body is kept unchanged, and the thermal conductivity coefficient lambda 2 of the new polyurethane foam can be calculated. Furthermore, the foaming system comprises, by mass, 100 parts of white materials, 25-32 parts of foaming agents, 1-3 parts of foaming aids and 165 parts of black materials.
Further, the white material comprises the following raw materials in percentage by mass: 35-40% of sorbitol, 30-35% of trimethylolpropane, 10-15% of sucrose, 15-20% of triethanolamine, 1-2% of water, 2-4% of catalyst and 2-4% of stabilizer.
Further, the foaming auxiliary agent is formed by mixing 85% of perfluoromorpholine and 15% of perfluoroalkane.
Further, the manufacturing method of the foaming system comprises the following steps:
1) mixing a white material, perfluoro-n-methylmorpholine, a foaming agent and a pure white material in a white material premixing tank according to a ratio at the temperature of 16-22 ℃ to obtain a mixed white material;
2) putting isocyanate with the viscosity of 700-800(25 ℃) and mPas high functionality into a black material premixing tank and uniformly stirring at the temperature of 16-22 ℃ to obtain a black material;
3) injecting the mixed white material and the mixed black material into an inner cavity of a material injection gun head under the pressure of 13-15MPA, and injecting the mixture into a box body mould to be foamed through a gun head nozzle after the mixture is fully mixed;
4) and after the foaming raw materials are cured in a mould for a period of time, demoulding to form a hard polyurethane foam heat-insulating layer in the refrigerator body.
The invention has the beneficial effects that:
according to the heat preservation foaming system based on the heat preservation refrigerator, the foaming system with high heat preservation performance is developed according to the heat preservation performance so as to meet the requirements of the refrigerator with small size and large volume, the cost increase caused by the use of the vacuum heat insulation plate is reduced, the working procedures are reduced, the heat preservation performance required by the foaming system of the refrigerator body can be predicted through heat load simulation analysis, compared with the existing working process of firstly developing and then verifying, the repeated test verification is greatly reduced, and the time cost and the labor cost are saved.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A heat preservation foaming system based on a heat preservation refrigerator comprises a simulation module;
the simulation module is a foaming system which is developed by calculating the heat conductivity coefficient of polyurethane by using a heat load simulation model and according to the obtained heat conductivity coefficient of the polyurethane.
Thermal load simulation model: the polyurethane foam heat conductivity coefficient and the average thickness of the box body are input, namely the average thickness of the polyurethane foam and the VIP plate thickness on each surface of the box body, the temperature inside and outside the box body and the area of each surface are input, so that the overall heat load of the box body can be obtained, and the formula is as follows: q ═ λ × sxΔ t/d, where: q is a thermal load, lambda is the thermal conductivity coefficient of the polyurethane foam and the vacuum insulation panel, S is the area of each surface of the box body, namely the area comprising the polyurethane foam and the vacuum insulation panel, d is the average thickness of the box body, namely the average thickness of the polyurethane foam and the VIP plate on each surface of the box body, and delta t is the temperature difference between the inside and the outside of the box body;
when the Q value is set constant, with 2 variables giving specific values, the last variable can be derived in reverse.
Taking this patent as an example, the total thermal load Q, Q1+ Qvip, Q1 λ 1 × S1 × Δ t/d1, Qvip λ vip × Svip × Δ t/dvip, is obtained from the thermal conductivity λ 1 of the polyurethane foam, the area S1 of the box polyurethane foam, the thickness d1 of the box polyurethane foam, the thermal conductivity λ vip of the vacuum insulation panel, the area Svip of the vacuum insulation panel of the box, the thickness dvip of the vacuum insulation panel of the box, and the internal and external temperature Δ t of the box. When the total heat load Q is not changed, the thickness of the new polyurethane foam is d2, the area of the new polyurethane foam is S2, and the temperature delta t inside and outside the box body is not changed, namely the heat conductivity coefficient lambda 2 of the new polyurethane foam can be reversely calculated.
Taking two thin-wall products of Mitsubishi BCD-681WQ3S and BCD-481WQ3M as examples, the average thickness of a box body is 45mm, two sides of the box body are respectively provided with a vacuum insulation board, the thermal conductivity coefficient of polyurethane foam of the box body is 19mw/mk, the thermal conductivity coefficient of the vacuum insulation boards in the box body is 2mw/mk, the thickness of the vacuum insulation boards is 12mm, and then according to the structure of the box body, heat load simulation analysis is carried out to calculate the heat load of the product at 0 ℃ in the box body at the temperature of 25 ℃ outside.
Further, calculating the heat load of the product at 0 ℃ in the external 25 ℃ box body, under the premise that the heat load is not changed, canceling vacuum insulation panels (vip panels) on two sides of the box body, calculating the heat conductivity coefficient of new polyurethane foam of the box body, developing a foaming system according to the calculated heat conductivity coefficient, and carrying out simulation analysis and calculation on the heat load, wherein the simulation analysis and calculation process comprises the following steps:
respectively calculating the heat load Q1 of the original box body polyurethane foam and the heat load Qvip of the vacuum insulation panel according to the heat conductivity coefficient lambda 1 of the original polyurethane foam, the heat conductivity coefficient lambda vip of the vacuum insulation panel, the area S1 of the polyurethane foam, the area Svip of the vacuum insulation panel, the thickness d1 of the polyurethane foam, the thickness dvip of the vacuum insulation panel and the condition of 0 ℃ in the box body at the temperature of 25 ℃ outside the box body by using a heat load calculation formula Q which is lambda multiplied by S multiplied by delta t/d, and then adding the two to obtain the total heat load Q of the original box body, wherein Q1 is lambda 1 multiplied by S1
Δt/d1，Qvip＝λvip×Svip×Δt/dvip，Q＝Q1+Qvip。
Further, the vacuum insulation panel is removed while keeping Q unchanged, then the size S2 of the box polyurethane foam (the size of the original placed vacuum insulation panel is added), the average thickness d2 of the box polyurethane foam are given again, and the heat conductivity coefficient lambda 2 of the new polyurethane foam is calculated reversely by using a heat load calculation formula Q which is lambda multiplied by S multiplied by delta t/d, namely the heat conductivity coefficient lambda 2 of the new polyurethane foam is obtained under the condition that the vacuum insulation panel is removed and the heat load is not increased. The same calculation procedure is shown in the following table:
the thermal conductivity coefficient of the polyurethane foam is calculated to be lambda 2 under the condition that the vacuum insulation panel is not removed and the thermal load is not increased through the table, and the thermal conductivity coefficient lambda 2 is calculated to be 16.5mw/mk by taking two thin-wall products of Mitsubishi BCD-681WQ3S and BCD-481WQ3M as examples.
Then, a foaming system was developed according to the thermal conductivity λ 2 of 16.5 mw/mk.
Wherein, the raw materials in the foaming system comprise, by mass, 100 parts of white material, 25-32 parts of foaming agent, 1-3 parts of foaming auxiliary agent and 150-165 parts of black material;
the white material is a mixed substance of polyether polyol, water, a catalyst and a stabilizer in different component proportions, and the white material comprises the following raw materials in percentage by mass: 35-40% of sorbitol, 30-35% of trimethylolpropane, 10-15% of sucrose, 15-20% of triethanolamine, 1-2% of water, 2-4% of catalyst and 2-4% of stabilizer.
The foaming agent is HFO-1233ZD, LBA for short, and is produced by Honeywell company;
the foaming auxiliary agent is formed by mixing 85% of perfluoromorpholine and 15% of perfluoroalkane to form a perfluorinated mixture;
the black material is polymethylene polyphenyl isocyanate with high functionality, mainly shows high viscosity, the viscosity of the black material is 700-.
Example 1
Manufacturing a foaming box body of a high-heat-preservation foaming system, wherein the foaming system comprises the following raw materials in parts by mass: 100 parts of white material, 28 parts of foaming agent, 4 parts of perfluoro-n-methylmorpholine and 158.5 parts of black material;
the white material is a mixture of polyether polyol, water, a catalyst and a stabilizer in different component proportions, and the white material comprises the following raw materials, by mass, 35% of sorbitol, 30% of trimethylolpropane, 12% of sucrose, 17% of triethanolamine, 1.5% of water, 2.5% of the catalyst and 2% of the stabilizer;
the black material is polymethylene polyphenyl isocyanate with high functionality, namely, the content of benzene ring is higher, the content of benzene ring is increased, the physical strength of polyurethane foam formed after the reaction is finished and cured is increased, the compressive strength is improved under the same density, the high viscosity is mainly shown, the viscosity is 700-800mPa & s at normal temperature, the content of isocyanic acid radical is 33-35%, the mark is PM-400 provided by Wanhua chemical group Limited company.
In addition, the foaming system comprises the following steps:
1) mixing a white material, perfluoro-n-methylmorpholine, a foaming agent and a pure white material in a white material premixing tank according to a ratio at the temperature of 18 ℃ to obtain a mixed white material;
2) putting isocyanate with high functionality into a black material premixing tank and stirring uniformly at the material temperature of 18 ℃ to obtain a black material;
3) injecting the mixed white material and the mixed black material into an inner cavity of a material injection gun head at the pressure of 13-15MPA, and injecting the mixture into a box body mould to be foamed through a gun head nozzle after the mixture is fully mixed;
4) and after the foaming raw materials are cured in a mould for a period of time, demoulding to form a hard polyurethane foam heat-insulating layer in the refrigerator body.
And after the completion, obtaining the foaming box body of the high-heat-preservation foaming system.
Example 2
Preparing a foaming box body of a common foaming system, wherein the common foaming system comprises 100 parts of white material, 245fa as a common foaming agent, 5 parts of cyclopentane 12 parts and 141 parts of black material, which are produced by the company Honeywell according to parts by mass;
the white material is a mixed substance of polyether polyol, water, a catalyst and a stabilizer in different component proportions, and the white material comprises the following raw materials, by mass, 40% of glycerol, 25% of ethylene glycol, 10% of sucrose, 19% of ethylenediamine, 1.5% of water, 2% of the catalyst and 2.5% of the stabilizer;
the black material is polymethylene polyphenyl isocyanate with common functionality, the viscosity of the black material is 300-400 mPa.s at normal temperature, the content of isocyanate is 30-32%, and the black material is provided by Wanhua chemical group Limited and has the brand number of PM-200.
The procedure for producing the foamed box body of the ordinary foaming system was the same as that for producing the foamed box body of the high-heat-insulation foaming system in example 1, and the foamed box body of the ordinary foaming system was obtained.
The polyurethane foam of the two refrigerator bodies has physical strength and heat preservation performance, and is a heat preservation layer of the refrigerator body to carry out comparison test, and the technical parameters are as follows:
as can be seen from the table above, the physical properties of the compressive strength and the volume shrinkage of the polyurethane foam of the foaming box body of the high-heat-preservation foaming system and the foaming box body of the common foaming system are basically consistent, the heat conductivity coefficient is much lower, and only 16.4mw/mk meets the requirement of thermal load simulation analysis. Then thin-walled products such as BCD-681WQ3S, BCD-481WQ3M and the like produced by adopting the foaming system have the first-grade energy consumption level, and other refrigeration performances meet the national standard requirements.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.
Claims (5)
1. The utility model provides a heat preservation foaming system based on heat preservation refrigerator which characterized in that: comprises a simulation module;
the simulation module is a foaming system which is developed by calculating the heat conductivity coefficient of polyurethane by using a heat load simulation model and according to the obtained heat conductivity coefficient of the polyurethane;
thermal load simulation model: the polyurethane foam heat conductivity coefficient, the average thickness of the box body, the internal and external temperatures of the box body and the area of each surface are input, so that the overall heat load of the box body can be obtained, and the formula is as follows: q ═ λ × sxΔ t/d, where: q is a thermal load, lambda is the heat conductivity coefficient of the polyurethane foam and the vacuum insulation panel, S is the area of each surface of the box body, d is the average thickness of the box body, and delta t is the temperature difference between the inside and the outside of the box body;
when the Q value is set to be unchanged, the thickness d2 of the new polyurethane foam and the area S2 of the new polyurethane foam are changed, the temperature delta t inside and outside the box body is kept unchanged, and the thermal conductivity coefficient lambda 2 of the new polyurethane foam can be calculated.
2. The heat preservation foaming system based on the heat preservation refrigerator as claimed in claim 1, characterized in that: the foaming system comprises 100 parts of white material, 25-32 parts of foaming agent, 1-3 parts of foaming auxiliary agent and 150-165 parts of black material by mass.
3. The heat preservation foaming system based on the heat preservation refrigerator as claimed in claim 2, characterized in that: the white material comprises the following raw materials in percentage by mass: 35-40% of sorbitol, 30-35% of trimethylolpropane, 10-15% of sucrose, 15-20% of triethanolamine, 1-2% of water, 2-4% of catalyst and 2-4% of stabilizer.
4. The heat preservation foaming system based on the heat preservation refrigerator as claimed in claim 2, characterized in that: the foaming auxiliary agent is prepared by mixing 85% of perfluoromorpholine and 15% of perfluoroalkane.
5. The heat preservation foaming system based on the heat preservation refrigerator as claimed in claim 2, characterized in that: the manufacturing method of the foaming system comprises the following steps:
1) mixing a white material, perfluoro-n-methylmorpholine, a foaming agent and a pure white material in a white material premixing tank according to a ratio at the temperature of 16-22 ℃ to obtain a mixed white material;
2) putting isocyanate with the viscosity of 700-800(25 ℃) and mPas high functionality into a black material premixing tank and uniformly stirring at the temperature of 16-22 ℃ to obtain a black material;
3) injecting the mixed white material and the mixed black material into an inner cavity of a material injection gun head under the pressure of 13-15MPA, and injecting the mixture into a box body mould to be foamed through a gun head nozzle after the mixture is fully mixed;
4) and after the foaming raw material is solidified in the mould for a period of time, demoulding to form polyurethane foam in the refrigerator body, wherein the polyurethane foam is the heat-insulating layer of the refrigerator body.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111303364A (en) * | 2020-04-15 | 2020-06-19 | 长虹美菱股份有限公司 | High-heat-insulation polyurethane foaming formula and freezer based on same |
| CN112009069A (en) * | 2020-08-12 | 2020-12-01 | 长虹美菱股份有限公司 | Vacuum insulation panel attaching process |
| CN112612772A (en) * | 2020-12-01 | 2021-04-06 | 中车长江车辆有限公司 | Polyurethane foaming simulation database construction method and device |
| CN113563555A (en) * | 2021-08-17 | 2021-10-29 | 长虹美菱股份有限公司 | Polyurethane foaming material and foaming process thereof |
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