CN114591529B - Refrigerator heat preservation and insulation material and preparation method thereof - Google Patents
Refrigerator heat preservation and insulation material and preparation method thereof Download PDFInfo
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- CN114591529B CN114591529B CN202210227301.2A CN202210227301A CN114591529B CN 114591529 B CN114591529 B CN 114591529B CN 202210227301 A CN202210227301 A CN 202210227301A CN 114591529 B CN114591529 B CN 114591529B
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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
- 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
- C08G18/48—Polyethers
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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
- C08J9/0066—Use of inorganic compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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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
- C08G2101/00—Manufacture of cellular products
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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
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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
- C08J2203/18—Binary blends of expanding agents
- C08J2203/182—Binary blends of expanding agents of physical blowing agents, e.g. acetone and butane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Polyurethanes Or Polyureas (AREA)
Abstract
The invention belongs to the technical field of heat insulation materials, and particularly relates to a refrigerator heat insulation material and a preparation method thereof. The product obtained by the invention comprises polyether polyol, a foaming agent, a catalyst, isocyanate and amorphous carbon; the foaming agent is prepared from a foaming agent A and a foaming agent B according to the mass ratio of 1:1-1:3, compounding; the foaming agent A is prepared from cyclopentane and isopentane according to a mass ratio of 1:5-1:6, compounding; the foaming agent B is prepared from cyclopentane and isopentane according to a mass ratio of 5:1-6:1 is compounded; during preparation, firstly, stirring and mixing polyether polyol and amorphous carbon uniformly, then adding a catalyst and a foaming agent A, and continuously stirring and mixing uniformly to obtain a premix; and then, equally dividing the isocyanate into two parts, adding one part of the isocyanate, stirring and mixing for 5-10s, then adding the foaming agent B, continuously stirring and mixing for 5-10s, pouring into a mold for constant-temperature foaming, curing, and demolding.
Description
Technical Field
The invention belongs to the technical field of heat insulation materials. And more particularly, to a refrigerator heat preservation and insulation material and a preparation method thereof.
Background
The polyurethane rigid foam plastic is a high polymer synthetic material with excellent performance, and has the characteristics of low density, high strength, low heat conductivity coefficient, high bonding strength and the like. It is widely used as heat-insulating material in refrigerator, freezer, etc. With the advent of the date of CFCs substance deactivation, CFC-11, as a blowing agent in rigid polyurethane foams, was deactivated.
To date, there are three main alternatives for CFC-11: (1) 50% of CFC-11 replacement; (2) HCFC-114b substituted for CFC-11; (3) cyclopentane replacing the CFC-11 scheme. The first option is to be abolished with the general disablement of CFC-11; the second scheme determines that HCFC-114b can only be a transitional substitute of CFC-11 due to the factors that the ozone depletion potential value of HCFC-114b is not zero and the like; the third cyclopentane alternative scheme is favored by some economically developed countries due to the fact that the cyclopentane alternative scheme has no destructive effect on the atmospheric ozone layer and the like, but the popularization and application of the cyclopentane alternative scheme are limited by factors such as flammability, explosiveness and the like.
In addition, because single cyclopentane is foamed, the processing performance of the material is general, which is specifically shown as follows: cyclopentane has a relatively high boiling point and requires a higher processing temperature for foaming, which adversely affects other properties of the product.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings that the existing heat-insulating material for the refrigerator needs to depend on higher processing temperature in the processing process, the mechanical property of the product is easily reduced at the processing temperature, and the product performance cannot be further improved, and provides a heat-insulating material for the refrigerator and a preparation method thereof.
The invention aims to provide a heat preservation and insulation material for a refrigerator.
The invention also aims to provide a preparation method of the refrigerator heat-preservation and heat-insulation material.
The above purpose of the invention is realized by the following technical scheme:
the refrigerator heat-insulating material comprises polyether polyol, a foaming agent, a catalyst and isocyanate;
the foaming agent is prepared from a foaming agent A and a foaming agent B according to the mass ratio of 1:1-1:3, forming;
the foaming agent A is prepared from cyclopentane and isopentane according to a mass ratio of 1:5-1:6, compounding;
the foaming agent B is prepared from cyclopentane and isopentane according to a mass ratio of 5:1-6:1 is compounded;
when the refrigerator heat-preservation and heat-insulation material is prepared, the foaming agent A is added firstly, and then the foaming agent B is added.
Further, the polyether polyol is selected from any one of polyether polyol 4110, polyether polyol 450 and polyether polyol 480.
Further, the catalyst is selected from any one of triethanolamine, cyclohexylamine and dibutyl tin dilaurate.
Further, the isocyanate is selected from any one of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate and lysine diisocyanate.
Further, the carbon fiber composite material also comprises amorphous carbon with the mass of 1-5% of polyether polyol.
A preparation method of a refrigerator heat preservation and insulation material comprises the following specific preparation steps:
preparing raw materials:
according to the weight portion, 80-100 portions of polyether polyol, 20-30 portions of foaming agent, 3-5 portions of catalyst, 20-25 portions of isocyanate and amorphous carbon with the mass of 1-5% of polyether polyol are taken in sequence;
the foaming agent is prepared from a foaming agent A and a foaming agent B according to the mass ratio of 1:1-1:3, forming a composite material;
the foaming agent A is prepared from cyclopentane and isopentane according to a mass ratio of 1:5-1:6, compounding;
the foaming agent B is prepared from cyclopentane and isopentane according to a mass ratio of 5:1-6:1 is compounded;
premixing:
firstly, uniformly stirring and mixing polyether polyol and amorphous carbon, then adding a catalyst and a foaming agent A, and continuously stirring and uniformly mixing to obtain a premix;
and (3) batch foaming:
the isocyanate is equally divided into two parts, one part is added firstly, after stirring and mixing for 5-10s, the foaming agent B and the other part of the isocyanate are added, after stirring and mixing for 5-10s, the mixture is poured into a mould for constant temperature foaming, and after curing, demoulding is carried out.
The invention has the following beneficial effects:
(1) According to the technical scheme, firstly, cyclopentane and isopentane are compounded, and have different boiling point temperatures, wherein the boiling point temperature of cyclopentane is about 49-50 ℃, the boiling point temperature of isopentane is about 28-30 ℃, and after the cyclopentane and the isopentane are mixed and compounded, azeotropes different from the boiling point temperatures can be formed by the cyclopentane and the isopentane, the relative amount of the azeotropes and the boiling point temperatures of the azeotropes can be effectively adjusted through controlling the proportion of the cyclopentane and the isopentane, so that when polyurethane foaming is performed, multi-stage foaming can be performed in a system, and foams with different sizes and quantities can be formed when multi-stage foaming is performed due to the difference of the boiling point temperatures and the foaming capacity of a foaming agent, compact foams can be formed between the foams, and the foams can be accurately controlled due to the fact that the sizes and the quantities of the foams are controlled based on the control of the different foaming agent proportions, so that good heat insulation performance can be guaranteed, and meanwhile, the foams are compactly filled and supported with each other foams, a firm foam system is formed, and the comprehensive performance of products is improved;
(2) According to the technical scheme, the foaming agent A and the foaming agent B with different compounding ratios are adopted at the same time, and the adding time of the foaming agent A and the foaming agent B is regulated and controlled in the product preparation process, so that the ratio of the foaming agent A to the foaming agent B is substantially the foaming amount of the foaming agent A in different foaming stages, the adding time can enable the product to be subjected to primary foaming preferentially under the action of the foaming agent A, and then the product is combined with the foaming agent B to start large-amount foaming, so that the generation rate of foam can be effectively regulated and controlled, excessive large foam or small foam is prevented from being generated in a centralized manner, and the large foam and the small foam in the system can be supported with each other;
(3) According to the technical scheme, the amorphous carbon is introduced, the amorphous carbon can be dispersed on the surface of a liquid film of polyurethane foam under the action of the foaming agent, and a discontinuous amorphous carbon layer can be formed on the surface of the foam through the control of the addition amount of the amorphous carbon, so that the product can have good comprehensive performance and can also avoid unnecessary interference of the amorphous carbon on the heat-insulating performance of the product.
Detailed Description
The present invention is further illustrated by the following specific examples, which are not intended to limit the invention in any way. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Unless otherwise indicated, reagents and materials used in the following examples are commercially available.
Example 1
Preparing raw materials:
and (2) cyclopentane and isopentane in a mass ratio of 1:5, stirring and mixing for 10min at the rotating speed of 200r/min by using a stirrer to obtain a foaming agent A;
and (3) cyclopentane and isopentane in a mass ratio of 5:1, stirring and mixing for 10min at the rotating speed of 200r/min by using a stirrer to obtain a foaming agent B;
taking 80 parts of polyether polyol, 20 parts of foaming agent, 3 parts of catalyst, 20 parts of isocyanate and amorphous carbon with the mass of the polyether polyol being 1% in sequence according to the parts by weight; wherein the foaming agent is prepared from a foaming agent A and a foaming agent B according to the mass ratio of 1:1 is formed;
firstly, mixing polyether polyol and amorphous carbon, stirring and mixing at constant temperature for 40min under the conditions that the temperature is 35 ℃ and the stirring speed is 400r/min, cooling to room temperature, adding a catalyst and a foaming agent A under the protection of nitrogen, and continuously stirring and mixing at 200r/min for 10min under the condition of room temperature to obtain a premix;
equally dividing isocyanate into two parts, firstly mixing one part of isocyanate with the premix, stirring and mixing for 5s at the rotating speed of 600r/min by using a stirrer, then adding a foaming agent B and the other part of isocyanate, continuously stirring and mixing for 5s at the rotating speed of 600r/min by using the stirrer, then pouring into a mould, foaming and curing at the constant temperature of 50 ℃, demoulding and cutting after a foam body is cured to obtain a product;
the polyether polyol is selected from polyether polyol 4110;
the catalyst is selected from triethanolamine;
the isocyanate is selected from toluene diisocyanate.
Example 2
Preparing raw materials:
and (2) cyclopentane and isopentane in a mass ratio of 1:5, stirring and mixing for 15min by a stirrer at the rotating speed of 250r/min to obtain a foaming agent A;
and (3) cyclopentane and isopentane in a mass ratio of 5:1, stirring and mixing for 15min at the rotating speed of 250r/min by using a stirrer to obtain a foaming agent B;
taking 90 parts of polyether polyol, 25 parts of foaming agent, 4 parts of catalyst, 23 parts of isocyanate and amorphous carbon with the mass of the polyether polyol being 3% in sequence according to the parts by weight; wherein the foaming agent is prepared from a foaming agent A and a foaming agent B according to the mass ratio of 1:2, forming;
firstly, mixing polyether polyol and amorphous carbon, stirring and mixing for 45min at a constant temperature under the conditions that the temperature is 36 ℃ and the stirring speed is 500r/min, cooling to room temperature, adding a catalyst and a foaming agent A under the protection of nitrogen, and continuously stirring and mixing for 15min at the rotation speed of 300r/min under the condition of room temperature to obtain a premix;
equally dividing isocyanate into two parts, firstly mixing one part of isocyanate with the premix, stirring and mixing for 6s at the rotating speed of 700r/min by using a stirrer, then adding a foaming agent B and the other part of isocyanate, continuously stirring and mixing for 8s at the rotating speed of 700r/min by using the stirrer, then pouring into a mould, foaming and curing at a constant temperature at the temperature of 51 ℃, demoulding and cutting after a foam body is cured to obtain a product;
the polyether polyol is selected from polyether polyol 450;
the catalyst is selected from cyclohexylamine;
the isocyanate is selected from isophorone diisocyanate.
Example 3
Preparing raw materials:
and (2) cyclopentane and isopentane in a mass ratio of 1:6, stirring and mixing for 20min by a stirrer at the rotating speed of 300r/min to obtain a foaming agent A;
and (2) cyclopentane and isopentane are mixed according to the mass ratio of 6:1, stirring and mixing for 20min by a stirrer at the rotating speed of 300r/min to obtain a foaming agent B;
taking 100 parts of polyether polyol, 30 parts of foaming agent, 5 parts of catalyst, 25 parts of isocyanate and amorphous carbon with the mass of the polyether polyol being 5% in sequence according to the parts by weight; wherein the foaming agent is prepared from a foaming agent A and a foaming agent B according to the mass ratio of 1:3, forming;
firstly, mixing polyether polyol and amorphous carbon, stirring and mixing at a constant temperature of 40 ℃ and a stirring speed of 600r/min for 60min, cooling to room temperature, adding a catalyst and a foaming agent A under the protection of nitrogen, and continuously stirring and mixing at a speed of 400r/min for 20min at room temperature to obtain a premix;
equally dividing isocyanate into two parts, firstly mixing one part of isocyanate with the premix, stirring and mixing for 10s at the rotating speed of 800r/min by using a stirrer, then adding a foaming agent B and the other part of isocyanate, continuously stirring and mixing for 10s at the rotating speed of 800r/min by using the stirrer, then pouring into a mould, foaming and curing at the constant temperature of 52 ℃, demoulding and cutting after a foam body is cured to obtain a product;
the polyether polyol is selected from the group consisting of polyether polyol 480;
the catalyst is selected from dibutyl tin dilaurate;
the isocyanate is selected from lysine diisocyanate.
Example 4
This example differs from example 1 in that: the amorphous carbon was not added and the remaining conditions were kept unchanged.
Example 5
This example differs from example 1 in that: the addition amount of amorphous carbon was 6.5% by mass of polyether polyol, and the rest conditions were kept constant.
Comparative example 1
Preparing raw materials:
taking 80 parts of polyether polyol, 20 parts of foaming agent, 3 parts of catalyst, 20 parts of isocyanate and amorphous carbon with the mass of the polyether polyol being 1% in sequence according to the parts by weight; wherein the foaming agent is cyclopentane;
firstly, mixing polyether polyol and amorphous carbon, stirring and mixing at a constant temperature of 35 ℃ and a stirring speed of 400r/min for 40min, cooling to room temperature, adding a catalyst and a half amount of foaming agent under the protection of nitrogen, and continuously stirring and mixing at a speed of 200r/min for 10min at room temperature to obtain a premix;
equally dividing isocyanate into two parts, firstly mixing one part of isocyanate with the premix, stirring and mixing for 5s at the rotating speed of 600r/min by using a stirrer, then adding the remaining half of the foaming agent and the other part of isocyanate, continuously stirring and mixing for 5s at the rotating speed of 600r/min by using the stirrer, then pouring into a mould, foaming and curing at the constant temperature at the temperature of 50 ℃, demoulding and cutting after a foam body is cured to obtain a product;
the polyether polyol is selected from polyether polyol 4110;
the catalyst is selected from triethanolamine;
the isocyanate is selected from toluene diisocyanate.
Comparative example 2
Preparing raw materials:
and (2) cyclopentane and isopentane in a mass ratio of 1:5, stirring and mixing for 10min at the rotating speed of 200r/min by using a stirrer to obtain a foaming agent A;
and (3) cyclopentane and isopentane in a mass ratio of 5:1, stirring and mixing for 10min at the rotating speed of 200r/min by using a stirrer to obtain a foaming agent B;
taking 80 parts of polyether polyol, 20 parts of foaming agent, 3 parts of catalyst, 20 parts of isocyanate and amorphous carbon with the mass of the polyether polyol being 1% in sequence according to the parts by weight; wherein the foaming agent is prepared from a foaming agent A and a foaming agent B according to the mass ratio of 1:1 is formed;
firstly, mixing polyether polyol and amorphous carbon, stirring and mixing at constant temperature for 40min under the conditions that the temperature is 35 ℃ and the stirring speed is 400r/min, cooling to room temperature, adding a catalyst, a foaming agent A and a foaming agent B under the protection of nitrogen, and continuously stirring and mixing at 200r/min for 10min under the condition of room temperature to obtain a premix;
equally dividing isocyanate into two parts, firstly mixing one part of isocyanate with the premix, stirring and mixing for 5s at the rotating speed of 600r/min by using a stirrer, then adding the other part of isocyanate, continuously stirring and mixing for 5s at the rotating speed of 600r/min by using the stirrer, then pouring the mixture into a mould, foaming and curing at the constant temperature of 50 ℃, demoulding and cutting after a foam body is cured to obtain a product;
the polyether polyol is selected from polyether polyol 4110;
the catalyst is selected from triethanolamine;
the isocyanate is selected from toluene diisocyanate.
Comparative example 3
Preparing raw materials:
and (2) cyclopentane and isopentane in a mass ratio of 1:5, stirring and mixing for 10min at the rotating speed of 200r/min by using a stirrer to obtain a foaming agent A;
and (3) cyclopentane and isopentane in a mass ratio of 5:1, stirring and mixing for 10min at the rotating speed of 200r/min by using a stirrer to obtain a foaming agent B;
taking 80 parts of polyether polyol, 20 parts of foaming agent, 3 parts of catalyst, 20 parts of isocyanate and amorphous carbon with the mass of the polyether polyol being 1% in sequence according to the parts by weight; wherein the foaming agent is prepared from a foaming agent A and a foaming agent B according to the mass ratio of 1:5, forming a structure;
firstly, mixing polyether polyol and amorphous carbon, stirring and mixing at constant temperature for 40min under the conditions that the temperature is 35 ℃ and the stirring speed is 400r/min, cooling to room temperature, adding a catalyst and a foaming agent A under the protection of nitrogen, and continuously stirring and mixing at 200r/min for 10min under the condition of room temperature to obtain a premix;
equally dividing isocyanate into two parts, firstly mixing one part of isocyanate with premix, stirring and mixing for 5s at the rotating speed of 600r/min by using a stirrer, then adding a foaming agent B and the other part of isocyanate, continuously stirring and mixing for 5s at the rotating speed of 600r/min by using the stirrer, then pouring into a mould, foaming and curing at the constant temperature under the condition that the temperature is 50 ℃, demoulding and cutting after a foam body is cured to obtain a product;
the polyether polyol is selected from polyether polyol 4110;
the catalyst is selected from triethanolamine;
the isocyanate is selected from toluene diisocyanate.
The products obtained in examples 1 to 5 and comparative examples 1 to 3 were subjected to performance tests, and the specific test methods and test results were as follows:
compressive strength:
testing by a SUN500 universal material tester according to GB/T8813-1988; specific test results are shown in table 1;
tensile strength:
testing by a SUN500 universal material testing machine according to GB/T9641-1988; specific test results are shown in table 1;
coefficient of thermal conductivity:
the heat conductivity coefficient test adopts an unsteady state method. During testing, the probe is placed between 2 same samples to be tested and is in close contact with the samples to form a sandwich structure, and the test samples are required to keep enough thickness and diameter so as to ensure that the temperature rise of the probe cannot be transmitted to the boundary in the testing process. The probe is a polyimide film with the radius of 6.403mm and is used as a heating source and a temperature sensor; the heat conductivity coefficient was measured at a humidity of 50% and a temperature of 30 ℃, and the specific test results are shown in table 1;
table 1: product performance test results
As can be seen from the test results in Table 1, the product obtained by the invention has good mechanical properties and low thermal conductivity, and the comprehensive properties are relatively excellent.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (5)
1. The preparation method of the refrigerator heat preservation and insulation material is characterized by comprising the following specific preparation steps:
preparing raw materials:
according to the weight portion, 80-100 portions of polyether polyol, 20-30 portions of foaming agent, 3-5 portions of catalyst, 20-25 portions of isocyanate and amorphous carbon with the mass of 1-5% of polyether polyol are taken in sequence;
the foaming agent is prepared from a foaming agent A and a foaming agent B according to the mass ratio of 1:1-1:3, forming;
the foaming agent A is prepared from cyclopentane and isopentane according to a mass ratio of 1:5-1:6, compounding;
the foaming agent B is prepared from cyclopentane and isopentane according to a mass ratio of 5:1-6:1 is compounded;
premixing:
firstly, uniformly stirring and mixing polyether polyol and amorphous carbon, then adding a catalyst and a foaming agent A, and continuously stirring and uniformly mixing to obtain a premix;
foaming in batches:
equally dividing isocyanate into two parts, firstly mixing one part with the premix, stirring and mixing for 5-10s, then adding the foaming agent B and the other part of isocyanate, continuously stirring and mixing for 5-10s, pouring into a mould for constant temperature foaming, curing, and demoulding.
2. The method for preparing a refrigerator thermal insulation material according to claim 1,
the constant temperature foaming temperature is 50-52 ℃.
3. The refrigerator thermal insulation material prepared by the preparation method of the refrigerator thermal insulation material according to the claims 1-2, wherein the polyether polyol is selected from any one of polyether polyol 4110, polyether polyol 450 and polyether polyol 480.
4. The refrigerator thermal insulation material according to claim 3, wherein the catalyst is selected from any one of triethanolamine, cyclohexylamine, dibutyl tin dilaurate.
5. The refrigerator thermal insulation material according to claim 4, wherein the isocyanate is selected from any one of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and lysine diisocyanate.
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| JP2653884B2 (en) * | 1989-09-04 | 1997-09-17 | 株式会社日立製作所 | Rigid polyurethane foam, method for producing the same, heat insulator, and refrigerator using the same |
| CN108164672A (en) * | 2017-12-28 | 2018-06-15 | 青岛海尔股份有限公司 | Polyurethane rigid foam plastic and preparation method thereof |
| CN108840985B (en) * | 2018-05-22 | 2020-11-27 | 南京红宝丽聚氨酯有限公司 | Hard polyurethane foam material for refrigerator and preparation method thereof |
| CN109251512A (en) * | 2018-09-17 | 2019-01-22 | 佛山市禅城区诺高环保科技有限公司 | A kind of long-acting weather-proof flame retarded rigid polyurethane foams |
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