CN110396213B - Polyurethane heat-insulating layer for refrigerator and preparation method thereof - Google Patents
Polyurethane heat-insulating layer for refrigerator and preparation method thereof Download PDFInfo
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- CN110396213B CN110396213B CN201910778275.0A CN201910778275A CN110396213B CN 110396213 B CN110396213 B CN 110396213B CN 201910778275 A CN201910778275 A CN 201910778275A CN 110396213 B CN110396213 B CN 110396213B
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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
- C08J9/141—Hydrocarbons
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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
- C08J9/146—Halogen containing compounds containing carbon, halogen and hydrogen only only fluorine as halogen atoms
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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
- C08J2203/20—Ternary blends of expanding agents
- C08J2203/202—Ternary blends of expanding agents of physical blowing agents
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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
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Refrigerator Housings (AREA)
- Polyurethanes Or Polyureas (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention discloses a polyurethane heat-insulating layer of a refrigerator and a preparation method thereof, and relates to the technical field of polyurethane foaming. The polyurethane heat-insulating layer comprises the following components in parts by weight: 100 parts of white material; 8-15 parts of pentane; r600a1-3 parts; HFO-1233ZD or HFC-245fa5-7 parts; 135 portions of black material and 150 portions of black material. According to the invention, by adding R600a, the effects of improving the foaming efficiency and the foam strength are achieved; by selecting HFO-1233ZD or HFC-245fa, the foam heat-insulating property can be improved due to low meteorological thermal conductivity; and black materials with high functionality are selected, so that the crosslinking degree is improved, the effect of improving the foam strength is achieved, and the foaming quality is integrally improved; meanwhile, the total injection amount of the polyurethane raw material is reduced, so that the overall foaming cost is effectively reduced; meanwhile, the white material, the R600a and the black material are mixed in three components and injected for foaming, so that dynamic mixing is realized, and the condition that the foaming quality is influenced due to uneven mixing caused by the fact that the R600a is difficult to be uniformly mixed in a static premixing tank due to low addition proportion is avoided.
Description
Technical Field
The invention belongs to the technical field of polyurethane foaming, and particularly relates to a polyurethane heat-insulating layer of a refrigerator and a preparation method thereof.
Background
The refrigerator is an indispensable electrical appliance for families, a very important process in the production link of the refrigerator is polyurethane foaming, and both a refrigerator body and a door body need to form foam after polyurethane foaming, so that the heat preservation and the supporting effects are achieved. Therefore, the foaming quality of the refrigerator is very important, meanwhile, the foaming technology of the refrigerator is continuously developed, the most mainstream foaming system of the first-line brand in China at present is multi-component mixed foaming, namely, various foaming agents of different types are mixed into white materials (hereinafter referred to as pure white materials) according to different proportions to form mixed materials (hereinafter referred to as mixed white materials), then the mixed white materials and isocyanate (hereinafter referred to as black materials) are injected into a box body or a door body to be foamed through a mixed injection gun head, and finally, the foaming process is completed.
In the process of premixing and mixing white materials, the problems that the adding proportion of some foaming agents is low or the foaming agents are difficult to dissolve in pure white materials are avoided, the premixing is not uniform enough, the foaming stability is poor, and the foaming quality is influenced.
Based on the defects of the prior art, it is important to develop a formula and a manufacturing process of a high-quality polyurethane heat-insulating layer suitable for premixing multiple foaming agents so as to improve the heat-insulating performance and the foaming quality of the polyurethane heat-insulating layer.
Disclosure of Invention
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a polyurethane heat-insulating layer of a refrigerator and a preparation method thereof, wherein the polyurethane heat-insulating layer comprises the following components in parts by weight:
wherein the foaming agent 2 is R600 a.
Further, the foaming agent 3 is HFO-1233ZD or HFC-245 fa.
Furthermore, the black material is polymethylene polyphenyl isocyanate, the viscosity is 350-500/mPa & s, and the content of isocyanate is 30.5-32%.
A preparation method of a polyurethane heat-insulating layer of a refrigerator comprises the following steps:
the method comprises the following steps: mixing a white material, pentane and a foaming agent 3 in a white material premixing tank according to the weight part ratio at the material temperature of 15-25 ℃ to obtain a mixed white material;
step two: uniformly stirring the black material in parts by weight in a black material premixing tank at the material temperature of 15-25 ℃ to obtain a prepared black material;
step three: injecting the foaming agent 2 into a foaming agent premixing tank through high-pressure liquefaction at the material temperature of 15-25 ℃ to obtain a liquid foaming agent 2;
step four: introducing the mixed white material, the prepared black material and the liquid foaming agent 2 into a material injection gun head, mixing, and injecting into a box body or a door body mould to be foamed through a gun head nozzle to form a foaming layer;
step five: and curing and demolding the foaming layer to obtain the polyurethane heat-insulating layer.
The invention has the following beneficial effects:
1. according to the invention, by adding R600a, the effects of improving foaming efficiency and foam strength are achieved due to the extremely low boiling point; the foaming agent 3 is selected from HFO-1233ZD or HFC-245fa, and the foam heat-insulating property can be improved due to low meteorological thermal conductivity; and black materials with high functionality are selected, so that the crosslinking degree is improved, the effect of improving the foam strength is achieved, and the foaming quality is integrally improved; meanwhile, the total injection amount of the polyurethane raw material is reduced, so that the overall foaming cost is effectively reduced.
2. According to the invention, the white material, the foaming agent 2 and the black material are mixed in three components and injected for foaming, so that dynamic mixing is realized, static low-speed mixing in a premixing tank is avoided, and the condition that the foaming quality is influenced due to uneven mixing caused by the fact that the foaming agent 2 is added in a very low proportion and is difficult to be uniformly mixed in the static premixing tank because the foaming agent 1 and the foaming agent 3 are added in a high proportion is avoided.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
The first embodiment is as follows:
the invention discloses a preparation method of a polyurethane heat-insulating layer of a refrigerator, which comprises the following steps:
the method comprises the following steps: mixing 100 parts of white material, 10 parts of pentane and 10 parts of HFO-1233ZD6 parts by weight in a white material premix tank at the material temperature of 15-25 ℃ to obtain mixed white material;
step two: under the condition that the material temperature is 15-25 ℃, 145 parts of polymethylene polyphenyl isocyanate with high functionality and viscosity of 350-500(25 ℃) mPa & s is uniformly stirred in a black material premixing tank to obtain a prepared black material;
step three: injecting 2.5 parts of R600a into a foaming agent premixing tank through high-pressure liquefaction at the material temperature of 15-25 ℃ to obtain liquid R600 a;
step four: introducing the mixed white material, the prepared black material and the liquid R600a into a material injection gun head, fully mixing, and injecting into a box body or a door body mould to be foamed through a gun head nozzle to form a foaming layer; wherein, the material injection pressure is 14 MPa;
step five: and (3) curing the foaming layer for 240 seconds, and then demolding to obtain the hard polyurethane heat-insulating layer.
Comparative example:
a polyurethane heat-insulating layer comprises the following raw materials in parts by mass:
the preparation method comprises the following steps:
the method comprises the following steps: mixing the white material, pentane and HFO-1233ZD in a white material premixing tank according to the weight part under the condition that the material temperature is 15-25 ℃ to obtain a mixed white material;
step two: under the condition that the material temperature is 15-25 ℃, polymethylene polyphenyl isocyanate with the viscosity of 350-;
step three: injecting the mixed white material and the prepared black material into an inner cavity of a material injection gun head at high speed and high pressure at the same time, and injecting the mixture into a box body or a door body mould to be foamed through a gun head nozzle after the mixture is fully mixed; wherein, the material injection pressure is 14 MPa;
step four: and (3) curing the foaming layer for 240 seconds, and then demolding to obtain the hard polyurethane heat-insulating layer.
After the polyurethane insulation layers prepared in the first embodiment and the comparative example are cooled to room temperature, the rigid polyurethane insulation layers are respectively taken out, and the related performances are tested, wherein the results are shown in table 1 and the comparison of foaming performances;
TABLE 1 comparison of foaming Properties
From the above table, the polyurethane formula and the preparation method of the invention can be obtained, the polyurethane foam insulation layer has excellent performance, and the compression strength and the heat conductivity coefficient are still better than those of the comparative example under the condition that the core density is less than that of the comparative example; meanwhile, the volume shrinkage rate is greatly improved; therefore, the polyurethane foam heat-insulating layer prepared by adding the low-boiling-point R600a and the optimized preparation method has higher heat-insulating property and foaming efficiency, so that the foaming quality is integrally improved; meanwhile, the effect of reducing the total injection amount of the polyurethane raw material is achieved, so that the overall foaming cost is effectively reduced.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (2)
1. A preparation method of a refrigerator polyurethane heat-insulating layer comprises the following steps of:
wherein the blowing agent 2 is R600a, the blowing agent 3 is HFO-1233ZD or HFC-245 fa; the method is characterized by comprising the following steps:
the method comprises the following steps: mixing a white material, pentane and a foaming agent 3 in a white material premixing tank according to the weight part ratio at the material temperature of 15-25 ℃ to obtain a mixed white material;
step two: uniformly stirring the black material in parts by weight in a black material premixing tank at the material temperature of 15-25 ℃ to obtain a prepared black material;
step three: injecting the foaming agent 2 into a foaming agent premixing tank through high-pressure liquefaction at the material temperature of 15-25 ℃ to obtain a liquid foaming agent 2;
step four: introducing the mixed white material, the prepared black material and the liquid foaming agent 2 into a material injection gun head, mixing, and injecting into a box body or a door body mould to be foamed through a gun head nozzle to form a foaming layer;
step five: and curing and demolding the foaming layer to obtain the polyurethane heat-insulating layer.
2. The method as claimed in claim 1, wherein the black material is polymethylene polyphenyl isocyanate, and has a viscosity of 350-500 mPa-s and an isocyanate content of 30.5-32%.
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| CN201910778275.0A CN110396213B (en) | 2019-08-22 | 2019-08-22 | Polyurethane heat-insulating layer for refrigerator and preparation method thereof |
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| CN110396213A CN110396213A (en) | 2019-11-01 |
| CN110396213B true CN110396213B (en) | 2022-02-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111072893A (en) * | 2019-12-06 | 2020-04-28 | 长虹美菱股份有限公司 | Freezer foaming layer |
| 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 |
| 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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| CN107522835A (en) * | 2017-08-17 | 2017-12-29 | 合肥美菱股份有限公司 | A kind of high viscosity fast response polyurethane foam system and its application |
| CN110054752A (en) * | 2019-04-29 | 2019-07-26 | 红宝丽集团股份有限公司 | A kind of low density rigid polyurethane foam and preparation method thereof |
| CN110305282A (en) * | 2019-07-04 | 2019-10-08 | 长虹美菱股份有限公司 | A kind of heat-insulated layer formula and foam process of negative pressure foamed refrigerator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2988878C (en) * | 2015-06-18 | 2023-09-26 | Basf Se | Method for producing a rigid polyurethane foam |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101550241A (en) * | 2009-05-19 | 2009-10-07 | 合肥美的荣事达电冰箱有限公司 | Environment protection type high-efficiency multiple mixing aerating powder for PU rigid foam |
| CN107522835A (en) * | 2017-08-17 | 2017-12-29 | 合肥美菱股份有限公司 | A kind of high viscosity fast response polyurethane foam system and its application |
| CN110054752A (en) * | 2019-04-29 | 2019-07-26 | 红宝丽集团股份有限公司 | A kind of low density rigid polyurethane foam and preparation method thereof |
| CN110305282A (en) * | 2019-07-04 | 2019-10-08 | 长虹美菱股份有限公司 | A kind of heat-insulated layer formula and foam process of negative pressure foamed refrigerator |
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