CN115651148B - Low-density all-water foaming polyurethane rigid foam - Google Patents
Low-density all-water foaming polyurethane rigid foam Download PDFInfo
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- 239000004814 polyurethane Substances 0.000 title claims abstract description 75
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- 238000005187 foaming Methods 0.000 title abstract description 9
- 229920000570 polyether Polymers 0.000 claims abstract description 53
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 51
- 239000000203 mixture Substances 0.000 claims abstract description 44
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- 229920005862 polyol Polymers 0.000 claims abstract description 37
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- 238000000034 method Methods 0.000 claims description 14
- 238000002360 preparation method Methods 0.000 claims description 14
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- 230000003078 antioxidant effect Effects 0.000 claims description 10
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 150000001412 amines Chemical group 0.000 claims description 6
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 6
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 6
- GTEXIOINCJRBIO-UHFFFAOYSA-N 2-[2-(dimethylamino)ethoxy]-n,n-dimethylethanamine Chemical compound CN(C)CCOCCN(C)C GTEXIOINCJRBIO-UHFFFAOYSA-N 0.000 claims description 5
- -1 polymethylene Polymers 0.000 claims description 5
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 4
- 239000004970 Chain extender Substances 0.000 claims description 4
- 229920001228 polyisocyanate Polymers 0.000 claims description 4
- 239000005056 polyisocyanate Substances 0.000 claims description 4
- 229920006389 polyphenyl polymer Polymers 0.000 claims description 4
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical class CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 239000004310 lactic acid Substances 0.000 claims description 3
- 235000014655 lactic acid Nutrition 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 2
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 claims description 2
- 229920005830 Polyurethane Foam Polymers 0.000 claims 10
- 239000011496 polyurethane foam Substances 0.000 claims 10
- 230000032683 aging Effects 0.000 claims 1
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- 239000000047 product Substances 0.000 description 9
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 208000009132 Catalepsy Diseases 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 description 1
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- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention relates to the technical field of all-water foaming polyurethane, and in particular provides a composition for low-density all-water foaming polyurethane rigid foam, which comprises the following components: 20-30 parts by weight of a first polyether polyol; 20-30 parts by weight of a second polyether polyol; 10-20 parts by weight of a third polyether polyol; 20-30 parts by weight of a polyester polyol; 2-4 parts by weight of a surfactant; 0.1 to 1 part by weight of a catalyst; 1-2 parts by weight of a pore-forming agent and 5.5-9 parts by weight of water. The all-water foaming polyurethane prepared by the composition has good performance.
Description
Technical Field
The invention relates to the technical field of all-water foaming polyurethane compositions and methods, in particular to a low-density all-water foaming polyurethane rigid foam.
Background
The polyurethane rigid foam is a high molecular polymer formed by taking polyol (polyether or polyester polyol) and isocyanate as main raw materials and carrying out chemical reaction under the action of a surfactant, a catalyst, a foaming agent and other auxiliary agents. The all-water foaming polyurethane rigid foam is environment-friendly polyurethane rigid foam taking water as a foaming agent, is widely applied to the aspects of cutting sheets, tube shells, pipeline supporting pieces, thin sheets and the like as refrigerated truck transportation, LNG tube bracket transportation, cold storage heat preservation, automobile ceiling sound absorbing materials and the like, and has the foam density of generally below 35kg/m 3, and has the foam hardness for achieving the effects of supporting and deformation prevention. High compression strength and toughness.
However, at present, the foam products are produced by adopting the combined polyether and the modified MDI, so that the foam is difficult to balance among low density, compressive strength, dimensional stability and toughness, and the compressive strength, the dimensional stability or the toughness are often reduced when the low density is pursued, so that the application is limited.
Therefore, there is a need in the art to develop a low density, all-water polyurethane rigid foam with better foam compression strength, toughness and dimensional stability to provide a polyurethane product for automotive roofs with better quality.
Disclosure of Invention
Therefore, the invention aims to provide a low-density all-water-blown polyurethane rigid foam with better foam compression strength, toughness and dimensional stability.
To this end, the invention provides a composition for polyurethane rigid foam comprising the following components:
20-30 parts by weight of a first polyether polyol: a trifunctional polyether which is a block polyether of EO and PO, the molar ratio of EO to PO being 70:30, the hydroxyl number being 34-38mKOH/g;
20-30 parts by weight of a second polyether polyol: difunctional polyethers with a hydroxyl number of 260 to 300mKOH/g;
10-20 parts by weight of a third polyether polyol: functionality is 5-6, hydroxyl value is 400-500mKOH/g;
20-30 parts by weight of a polyester polyol having a functionality of 2-3 and a hydroxyl number of 280-480mKOH/g;
2-4 parts by weight of a surfactant;
0.1 to 1 part by weight of a catalyst;
1-2 parts by weight of a pore opening agent;
And 5.5 to 9 parts by weight of water.
Further, the surfactant is a silicone surfactant; and/or the catalyst is an amine catalyst; and/or the pore opening agent is pore opening agent O-501. Amine catalysts may be, but are not limited to, A1 or a33.
Further, the catalyst is a composite catalyst comprising bis (dimethylaminoethyl) ether and triethylenediamine, preferably, the mass ratio of the bis (dimethylaminoethyl) ether to the triethylenediamine is 0.02-0.04:0.1-0.2.
Both bis (dimethylaminoethyl) ether and triethylenediamine are commercially available from air chemical engineering, inc.
Further, the composition also comprises 5 to 10 weight parts of chain extender and/or 0.5 to 1.6 weight parts of lactic acid and/or 0.3 to 1 weight part of antioxidant;
optionally, the chain extender is selected from at least one of triethylene glycol, diethylene glycol and triethanolamine;
Optionally, the antioxidant is selected from antioxidant K3.
Further, the viscosity of the polyester polyol is 2000 to 9000mpa.s (25 ℃).
The invention also provides a polyurethane rigid foam, which comprises the composition for the polyurethane rigid foam, and further comprises isocyanate, wherein the mass ratio of the composition to the isocyanate is preferably 1:1.5-1.8.
Further, the isocyanate is at least one selected from diphenylmethane diisocyanate, polymethylene polyphenyl polyisocyanate and modified toluene diisocyanate, and preferably, the isocyanate comprises polymethylene polyphenyl polyisocyanate and modified toluene diisocyanate in a mass ratio of 1-1.1:0.5-0.7.
Wherein TDI can be modified by conventional means, such as an isocyanate-terminated product formed by prepolymerization with a polyether polyol, which can be made in situ or purchased, such as from optimization chemistry under the trademark RF 8215.
The invention also provides a preparation method of the polyurethane rigid foam, which comprises the steps of mixing the components in the composition for the polyurethane rigid foam to obtain a prepolymer, mixing the prepolymer with isocyanate, and curing to obtain the polyurethane rigid foam.
Further, the preparation method of the prepolymer comprises the step of stirring each component in the composition for the polyurethane rigid foam for 1 to 1.5 hours at the rotating speed of 500 to 800r/min under the condition of 10 to 35 ℃.
Further, the mass ratio of the prepolymer to the isocyanate is 1:1.5-1.8.
Further, curing is carried out at normal temperature for 48-72h.
In the present invention, the functionality and hydroxyl number refer to the average functionality and average hydroxyl number.
The technical scheme of the invention has the following advantages:
1. The invention provides a composition for polyurethane rigid foam, which comprises the following components: 20-30 parts by weight of a first polyether polyol: a trifunctional polyether which is a block polyether of EO and PO, the molar ratio of EO to PO being 70:30, the hydroxyl number being 34-38mKOH/g;20-30 parts by weight of a second polyether polyol: difunctional polyethers with a hydroxyl number of 260 to 300mKOH/g;10-20 parts by weight of a third polyether polyol: functionality is 5-6, hydroxyl value is 400-500mKOH/g;20-30 parts by weight of a polyester polyol having a functionality of 2-6 and a hydroxyl number of 280-480mKOH/g;2-4 parts by weight of a surfactant; 0.1 to 1 part by weight of a catalyst; 1-2 parts by weight of a pore-forming agent and 5.5-9 parts by weight of water. The fully water blown polyurethane rigid foam prepared by adopting the combination of the first polyether polyol with the hydroxyl value of 34-38mKOH/g and the difunctional polyether with the hydroxyl value of 260-300mKOH/g, the second polyether polyol with the hydroxyl value of 5-6, the polyester polyol with the hydroxyl value of 400-500mKOH/g, the functionality of 2-6 and the hydroxyl value of 280-480mKOH/g and the surfactant, the catalyst, the pore opening agent and the water in a specific proportion has obviously improved foam compression strength, toughness and dimensional stability, and particularly on the basis of the second polyether polyol and the third polyether polyol, the compression strength and toughness of the fully water blown polyurethane rigid foam can be greatly improved by introducing the first polyether polyol with the hydroxyl value of 34-38mKOH/g and the molar ratio of 70:30 on the basis of the second polyether polyol and the third polyether polyol, so that the fully water blown polyurethane rigid foam can still have good mechanical properties on the basis of maintaining low density.
2. The composition for the polyurethane rigid foam provided by the invention can further improve the compression strength and toughness of the all-water foaming polyurethane rigid foam by adopting the silicone surfactant.
Detailed Description
The following examples are provided for a better understanding of the present invention and are not limited to the preferred embodiments described herein, but are not intended to limit the scope of the invention, any product which is the same or similar to the present invention, whether in light of the present teachings or in combination with other prior art features, falls within the scope of the present invention.
The specific experimental procedures or conditions are not noted in the examples and may be followed by the operations or conditions of conventional experimental procedures described in the literature in this field. The reagents or apparatus used were conventional reagent products commercially available without the manufacturer's knowledge. Viscosity: according to GB T10247-2008.
Description of the raw materials used in the examples:
first polyether polyol: 3521, hydroxyl number, available from Shanghai Fujia fine chemical Co., ltd: 36.5mgKOH/g, which is a block polyether of EO and PO, the molar ratio of EO to PO being 70:30, viscosity: 2840mPa.s (25 ℃), functionality: 3, the moisture content was 0.083%.
Second polyether polyol: d204, available from Shanghai Fujia fine chemical Co., ltd., hydroxyl number: 284mgKOH, viscosity: 76mpa.s (25 ℃), functionality: 2, the moisture content was 0.083%.
Third polyether polyol: 450L, available from Shanghai Fujia fine chemical Co., ltd., hydroxyl number: 459mgKOH, viscosity: 8860mPa.s (25 ℃ C.), functionality: 5.7, moisture content of 0.075%.
PS3152: polyester polyol, available from the company of the chemical engineering of the catalepsy, hydroxyl number: 459mgKOH, viscosity: 8860mPa.s (25 ℃ C.), functionality: 5.7, moisture content was 0.083%.
AK3007: polyester polyol, available from Aijing (Ningbo) chemical Co., ltd., hydroxyl number: 308mgKOH, viscosity: 2572mPa.s (25 ℃), functionality: 2.4, moisture content was 0.045%.
M8805: surfactants, available from Jiangsu Mei Si chemical Co., ltd.
A1: amine catalysts, available from air chemical industry limited.
A33: amine catalysts, available from air chemical industry limited.
O-501: and the pore-forming agent is purchased from winning origins.
Lactic acid, available from Shanghai easy casting industries, inc.
Antioxidant K3:100% active liquid hindered phenol antioxidant is purchased from Shanghai petrochemical industry.
The water is deionized water.
Isocyanate:
PAPI: purchased from Wanhua, model PM200.
Modified TDI: purchased from optimized chemical technology development (Shanghai) limited. Model: RF8215.
Example 1
The embodiment provides a composition for polyurethane rigid foam, which comprises the following components in percentage by weight:
The embodiment also provides a polyurethane rigid foam and a preparation method thereof, wherein the raw materials of the polyurethane rigid foam comprise the composition for the polyurethane rigid foam and modified TDI, and the preparation method thereof is as follows: the components in the composition for the polyurethane rigid foam are mixed, stirred for 1h at the temperature of 20 ℃ and the rotating speed of 500r/min to obtain a prepolymer, and the prepolymer, PAPI and modified TDI are mixed according to the mass ratio of 1:1.1:0.5, stirring for 8 seconds by using an electric stirrer, pouring the uniformly mixed liquid into a die with the constant temperature of 28 ℃, and standing for 60 hours at normal temperature to complete curing, thus obtaining the polyurethane rigid foam.
Example 2
The embodiment provides a composition for polyurethane rigid foam, which comprises the following components in percentage by weight:
The embodiment also provides a polyurethane rigid foam and a preparation method thereof, wherein the raw materials of the polyurethane rigid foam comprise the composition for the polyurethane rigid foam and modified TDI, and the preparation method thereof is as follows: the components in the composition for the polyurethane rigid foam are mixed, stirred for 1.5 hours at the temperature of 25 ℃ and the rotating speed of 800r/min to obtain a prepolymer, and the prepolymer, the PAPI and the modified TDI are mixed according to the mass ratio of 1:1:0.5, stirring for 8 seconds by using an electric stirrer, pouring the uniformly mixed liquid into a die with the constant temperature of 28 ℃, and standing for 48 hours at normal temperature to complete curing, thus obtaining the polyurethane rigid foam.
Example 3
The embodiment provides a composition for polyurethane rigid foam, which comprises the following components in percentage by weight:
The embodiment also provides a polyurethane rigid foam and a preparation method thereof, wherein the raw materials of the polyurethane rigid foam comprise the composition for the polyurethane rigid foam and modified TDI, and the preparation method thereof is as follows: the components in the composition for the polyurethane rigid foam are mixed, stirred for 1h at the temperature of 20 ℃ and the rotating speed of 500r/min to obtain a prepolymer, and the prepolymer, PAPI and modified TDI are mixed according to the mass ratio of 1:1.1:0.7, stirring for 8 seconds by using an electric stirrer, pouring the uniformly mixed liquid into a die with the constant temperature of 28 ℃, and standing for 72 hours at normal temperature to complete curing, thus obtaining the polyurethane rigid foam.
Example 4
The embodiment provides a composition for polyurethane rigid foam, which comprises the following components in percentage by weight:
The embodiment also provides a polyurethane rigid foam and a preparation method thereof, wherein the raw materials of the polyurethane rigid foam comprise the composition for the polyurethane rigid foam and modified TDI, and the preparation method thereof is as follows: the components in the composition for the polyurethane rigid foam are mixed, stirred for 1h at the temperature of 20 ℃ and the rotating speed of 500r/min to obtain a prepolymer, and the prepolymer, PAPI and modified TDI are mixed according to the mass ratio of 1:1.1:0.7, stirring for 8 seconds by using an electric stirrer, pouring the uniformly mixed liquid into a die with the constant temperature of 28 ℃, and standing for 72 hours at normal temperature to complete curing, thus obtaining the polyurethane rigid foam.
Example 5
This example provides a composition for polyurethane rigid foam, a polyurethane rigid foam and a method for preparing the same, the formulation and process of which are substantially the same as those of example 3, except that the polyester polyol PS3152 of example 3 is replaced with AK3007 of the same quality.
Comparative example 1
The polyether packages were formulated and polyurethane products were prepared as described in example 1 of patent CN114057976 a.
The formula is as follows: polyether polyol a:45kg, polyester polyol B:5kg, polyether polyol C:35kg, polyether polyol D:15kg, 1kg of catalyst, 3kg of special composite silicone oil, 40kg of flame retardant, 15kg of foaming agent and isocyanate: 235kg.
Polyether polyol A is a trifunctional polyol having a hydroxyl number of 420mgKOH/g, available from optimization chemistry, model: RF 304. The polyester polyol B is a difunctional phthalic anhydride polyester polyol with a hydroxyl value of 245mgKOH/g, and is purchased from the company of Ziboruno chemical Co., ltd., model: PS2412. Polyether polyol C is tetrafunctional, EO/PO block grafted, hydroxyl number 32mgKOH/g, available from optimization chemistry, model: POP3628. Polyether polyol D is difunctional and has a hydroxyl number of 1000mgK0H/g, available from optimization chemistry, model: RF 210. The flame retardant is expandable graphite and phosphate compound (TCPP) with the mass ratio of 2:1. Catalyst: amine catalysts comprising A1 and A33 in a mass ratio of 0.02:0.1. The foaming agent is a chemical foaming agent and a physical foaming agent (purchased from Honival, HFC-245 fa) in a mass ratio of 9:1, and the chemical foaming agent is water. Isocyanate: special modified MDI (model RF8215, supplied by optimization chemistry).
The preparation method comprises the following steps: vacuum degassing polyether polyol A, polyester polyol B, polyether polyol C and polyether polyol D under vacuum degree of 0.07-0.08Mpa, controlling temperature at 30deg.C for 2 hr; premixing, adding a flame retardant, stirring, and independently preparing the rest components; adding the prepared materials into a mixing tank, rapidly stirring for 20 seconds, rapidly pouring into a mold, and observing the viscous liquid from semitransparent to full-turbidity and blushing; the rising foam was observed to stop growing, stabilize and gel, and a large number of bubbles were spitted out of the epidermis.
Comparative example 2
This comparative example provides a composition for polyurethane rigid foam, a polyurethane rigid foam and a method for preparing the same, the formulation and process of which are substantially the same as example 3, except that the first polyether polyol of example 3 is replaced with the following polyether polyol: polyether polyol RF 3500, supplied by optimization chemistry, has a hydroxyl number of 37.2mg koh/g, which is a block polyether of PO and PO, a viscosity of 1530mpa.s, a functionality of 3.0, and a moisture content of 0.075%.
Comparative example 3
The present comparative example provides a composition for polyurethane rigid foam, a polyurethane rigid foam and a method for preparing the same, the formulation and process of which are substantially the same as those of example 3, except that the polyester polyol is not present in the present comparative example.
Comparative example 4
This comparative example provides a composition for a polyurethane rigid foam, a polyurethane rigid foam and a method for preparing the same, the formulation and process of which are substantially the same as example 3, except that the second polyether polyol of example 3 is replaced with a polyether polyol as follows: polyether polyol RF 307, supplied by the optimization chemistry, has a hydroxyl number of 241mgKOH/g, a viscosity of 430mPa.s, a functionality of 3.0, and a moisture content of 0.049%.
Comparative example 5
The comparative example provides a composition for polyurethane rigid foam, a polyurethane rigid foam and a method for producing the same, the formulation and process of which differ from those of comparative example 4 only in that the water amount was adjusted to 10kg, and the core density of the resulting polyurethane rigid foam was 25.5kg/m 3.
Comparative example 6
The comparative example provides a composition for polyurethane rigid foam, a polyurethane rigid foam and a method for producing the same, the formulation and process of which differ from those of comparative example 4 only in that the water amount was adjusted to 11kg, and the core density of the resulting polyurethane rigid foam was 33.3kg/m 3.
Polyurethane rigid foams were prepared according to the methods described in the above examples and comparative examples, and the same mold was used in each example and comparative example to maintain the shape of the product consistent, and the properties of the product were tested according to the following standards, and the property test positions were the same. Density: according to GB T6343-2009 test; compressive strength: according to GB8813-2008 test; volume change rate: according to GB8811-2008 test; elongation at break and tensile strength at break: according to GB T6344-2008 test.
Table 1 results of performance testing of examples and comparative examples
Wherein, the vertical direction is the rising direction of the foam, namely the upward direction, and the directions 1 and 2 are horizontal directions and are mutually vertical.
As can be seen from the above table, the polyurethane rigid foams obtained in examples 3 and 4 of the present invention have significantly improved compressive strength, tensile strength at break, elongation at break and significantly reduced low temperature volume change rate as compared with comparative examples 1 to 4.
Compared with comparative example 5, the polyurethane rigid foam obtained in example 2 of the present invention has significantly improved compressive strength, tensile strength at break and elongation at break, and significantly reduced low-temperature volume change rate.
Compared with comparative example 6, the polyurethane rigid foam obtained in example 1 of the present invention has significantly improved compressive strength, tensile strength at break and elongation at break, and significantly reduced low-temperature volume change rate.
The polyurethane block foam obtained by the application has better compression strength, tensile strength, dimensional stability and elongation at break than those of the product of the comparative example under the condition that the core density of the polyurethane block foam is basically consistent with that of the final product of the comparative example, and in addition, the modified TDI has low price, so that the raw material cost is saved as a whole.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (13)
1. A composition for polyurethane rigid foam, characterized in that it comprises the following components:
20-30 parts by weight of a first polyether polyol: a trifunctional polyether which is a block polyether of EO and PO, the molar ratio of EO to PO being 70:30, the hydroxyl value being 34-38mgKOH/g;
20-30 parts by weight of a second polyether polyol: difunctional polyether with hydroxyl value of 260-300mgKOH/g;
10-20 parts by weight of a third polyether polyol: functionality is 5-6, hydroxyl value is 400-500mgKOH/g;
20-30 parts by weight of a polyester polyol which is a polyester polyol having a functionality of 2-2.4 and a hydroxyl value of 280-308mgKOH/g or a polyester polyol PS3152;
2-4 parts by weight of a surfactant;
0.1 to 1 part by weight of a catalyst;
1-2 parts by weight of a pore-forming agent and 5.5-9 parts by weight of water.
2. The composition for a rigid polyurethane foam according to claim 1, wherein the surfactant is a silicone-based surfactant; and/or the catalyst is an amine catalyst; and/or the pore opening agent is pore opening agent O-501.
3. The composition for a rigid polyurethane foam according to claim 1, wherein the catalyst is a composite catalyst comprising bis (dimethylaminoethyl) ether and triethylenediamine.
4. A composition for rigid polyurethane foam according to claim 3, characterized in that the mass ratio of bis (dimethylaminoethyl) ether to triethylenediamine is 0.02-0.04:0.1-0.2.
5. The composition for a rigid polyurethane foam according to any one of claims 1 to 4, further comprising 5 to 10 parts by weight of a chain extender and/or 0.5 to 1.6 parts by weight of lactic acid and/or 0.3 to 1 part by weight of an antioxidant;
optionally, the chain extender is selected from at least one of triethylene glycol, diethylene glycol and triethanolamine;
Optionally, the antioxidant is selected from antioxidant K3; the antioxidant K3 is 100% active liquid hindered phenol antioxidant and is purchased from Shanghai petrochemical industry.
6. A rigid polyurethane foam, characterized in that the raw materials thereof comprise the composition for rigid polyurethane foam according to any one of claims 1 to 5, and further comprise isocyanate.
7. The polyurethane rigid foam according to claim 6, wherein the mass ratio of the composition to isocyanate is 1:1.5-1.8.
8. The polyurethane rigid foam according to claim 6, wherein the isocyanate is at least one selected from the group consisting of diphenylmethane diisocyanate, polymethylene polyphenyl polyisocyanates, and modified toluene diisocyanates.
9. The polyurethane rigid foam according to claim 8, wherein the isocyanate comprises polymethylene polyphenyl polyisocyanate and modified toluene diisocyanate in a mass ratio of 1 to 1.1:0.5 to 0.7.
10. A process for producing a rigid polyurethane foam according to any one of claims 6 to 9, characterized in that the components of the composition for rigid polyurethane foam are mixed to give a prepolymer, and the prepolymer is mixed with isocyanate and cured to give a rigid polyurethane foam.
11. The method according to claim 10, wherein the preparation of the prepolymer comprises stirring each component of the composition for rigid polyurethane foam at a speed of 500 to 800r/min for 1 to 1.5 hours at a temperature of 10 to 35 ℃.
12. The preparation method according to claim 10 or 11, wherein the mass ratio of the prepolymer to the isocyanate is 1:1.5-1.8.
13. The preparation method according to claim 10 or 11, wherein the aging is carried out at normal temperature for 48-72 hours.
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