CN115975143A - Hydroxyl compound for preparing two-component solvent-free polyurethane resin and application thereof - Google Patents
Hydroxyl compound for preparing two-component solvent-free polyurethane resin and application thereof Download PDFInfo
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- CN115975143A CN115975143A CN202310056867.8A CN202310056867A CN115975143A CN 115975143 A CN115975143 A CN 115975143A CN 202310056867 A CN202310056867 A CN 202310056867A CN 115975143 A CN115975143 A CN 115975143A
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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
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Abstract
The invention provides a hydroxyl composition for preparing a two-component solvent-free polyurethane resin and application thereof, wherein the hydroxyl composition comprises a combination of vegetable oil polyol A, bio-based polyester polyol A and a chain extender, the influence of an added filler on the hydroxyl composition is small when the hydroxyl composition is used for preparing the polyurethane resin, the addition amount of the filler can be increased to 100%, and the hydroxyl composition has excellent bonding performance with a water-based surface layer when being used as a preparation raw material of a synthetic leather bonding layer, and can also make the prepared polyurethane resin have biodegradability.
Description
Technical Field
The invention belongs to the technical field of polyurethane, and particularly relates to a hydroxyl compound for preparing two-component solvent-free polyurethane resin and application thereof.
Background
TPU is a block copolymer composed of isocyanate, polymeric polyol and small molecular weight polyol as chain extenders. Different types of curing agents, polyols and chain extenders are adopted for matching to obtain products with different performances, so that the TPU product has very wide application. The TPU also has excellent mechanical properties such as high strength, high elasticity, high wear resistance, high flexibility and the like, and also has the properties of oil resistance, solvent resistance and resistance to common chemicals, and is widely applied to synthetic leather.
With the transformation and upgrading of the synthetic leather industry, the market has higher and higher requirements on environmental protection, downstream synthetic leather customers have more and more strict requirements on the residual quantity of organic solvents in products, and even require full environmental protection and zero content, so that the solvent-free polyurethane synthetic leather has attracted wide attention. CN 10639728A discloses a two-component full-dry-adhesion bonding layer polyurethane resin for environment-friendly low-VOC synthetic leather and a preparation method thereof, wherein the polyurethane resin is mainly prepared from the following components in parts by mass: 10-20 parts of isocyanate; 25-40 parts of a polyol compound; 1-5 parts of a dihydric alcohol chain extender; 0-0.5 part of antioxidant; the addition amount of the organic tin catalyst or the organic bismuth catalyst is 0.001-0.05% of the weight of the polyol compound, the polyurethane resin prepared by the invention greatly improves the bonding performance of the polyurethane resin of the bonding layer, the bonding fastness is good under the conditions of drying the polyurethane film and completely volatilizing the solvent, the content of the organic solvent in the manufactured synthetic leather product is greatly reduced, the environmental protection performance of the product is improved, and the market competitiveness is very high.
However, after the materials A and B of the conventional solvent-free polyurethane resin are added with waste plant residues, such as bagasse, which is waste material in sugar industry as a filler, the materials A and B are obviously tackified, difficult to add in large amount and easy to absorb moisture, and the polar substances in the materials A and B can greatly influence the reaction.
In addition, as environmental protection policies are further promoted, the zero-solvent synthetic leather will also become a necessary trend in the future. The synthetic leather prepared by the existing pure water technology has poor mechanical properties, and the application of the synthetic leather is severely restricted by the poor hydrolysis resistance; the solvent-free double-component water-based surface layer is matched with the solvent-free double-component water-based surface layer, and the strong hydrophilicity of the water-based surface layer seriously influences the reaction, so that the production is unstable.
Therefore, it is an urgent technical problem in the art to develop a hydroxyl compound which is less affected by a filler, can be bonded to an aqueous surface layer, and is excellent in hygroscopicity and degradability.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a hydroxyl compound for preparing a two-component solvent-free polyurethane resin and an application thereof, wherein the hydroxyl compound is less influenced by adding a filler in the preparation process when used for preparing the polyurethane resin, and a polar substance in a bio-based filler is not easy to dissolve out of the hydroxyl compound, so that the adding amount of the filler can be increased to 100%, and the hydroxyl compound has stronger strong hydrophobicity when used for preparing a raw material of a synthetic leather bonding layer, can effectively prevent the polar substance in an aqueous surface layer from dissolving out to cause two-component reaction influence, and further realizes excellent bonding performance with the surface layer.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a hydroxy compound for use in preparing a two-component solvent-free polyurethane resin,
the hydroxyl compound comprises the following components in parts by weight:
70-90 parts by weight of vegetable oil polyalcohol A
10-30 parts by weight of bio-based polyester polyol A
1-20 parts of chain extender.
Wherein the vegetable oil polyol A may be 72 parts by weight, 74 parts by weight, 76 parts by weight, 78 parts by weight, 80 parts by weight, 82 parts by weight, 84 parts by weight, 86 parts by weight, 88 parts by weight, or the like.
The bio-based polyester polyol a may be 12 parts by weight, 14 parts by weight, 16 parts by weight, 18 parts by weight, 20 parts by weight, 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight, or the like.
The chain extender may be 2, 4, 6, 8, 10, 12, 14, 16, 18, or the like parts by weight.
The hydroxyl compound for preparing the two-component solvent-free polyurethane resin comprises vegetable oil polyol A in a specific part and bio-based polyester polyol A in a specific part in a matching manner; the use level of the vegetable oil polyol A is obviously higher than that of the bio-based polyester polyol A, the crosslinking degree of the two-component solvent-free polyurethane resin prepared by the hydroxyl composition can be improved to a certain extent, but the performance of the product can be influenced by the excessively high crosslinking degree, so that the specific vegetable oil polyol A and the bio-based polyester polyol A are matched within a specific use level range; meanwhile, when the hydroxyl composition is used for preparing the polyurethane resin subsequently, the added filler has good compatibility, namely, the original performance of the polyurethane resin cannot be influenced by adding a large amount of filler (comprising waste plant residues and the like) when the polyurethane resin is prepared, the viscosity of the material cannot be increased, the moisture absorption cannot be easily caused, the filler can be added in a large amount, and the highest addition amount can be increased to 100%; in addition, the crosslinking degree provided by the vegetable oil polyalcohol added into the hydroxyl composition can ensure that a large amount of hydroxyl compounds under the filler still have enough reaction activity, and meanwhile, the addition of the bio-based polyester polyalcohol ensures that a large amount of hydroxyl compounds under the filler still have enough strength, so that the comprehensive performance of a finally obtained polyurethane product is improved.
The components in the hydroxyl compound provided by the invention are all biodegradable, so that the polyurethane resin prepared from the hydroxyl compound also has good biodegradability, and the synthetic leather further prepared has good environmental protection characteristics.
Preferably, the vegetable oil polyol a comprises any one of castor oil polyol, soybean oil polyol or palm oil polyol or a combination of at least two thereof.
Preferably, the functionality of the vegetable oil polyol a is not less than 2, such as 3, 4, 5, 6, 7, or 8, and the like.
Preferably, the functionality of the bio-based polyester polyol a is 2 to 3.
Preferably, the hydroxyl number of the biobased polyester polyol A is 28 to 112mkgKOH/g, such as 30mkgKOH/g, 40mkgKOH/g, 50mkgKOH/g, 60mkgKOH/g, 70mkgKOH/g, 80mkgKOH/g, 90mkgKOH/g, 100mkgKOH/g, or 110mkgKOH/g, and the like.
Preferably, the raw materials for preparing the bio-based polyester polyol A comprise bio-based diol and bio-based diacid.
Preferably, the bio-based diol comprises bio-based 1, 3-propanediol and/or bio-based 1, 4-butanediol, and is further preferably bio-based 1, 3-propanediol.
Preferably, the bio-based dibasic acid comprises any one or a combination of at least two of bio-based dimer acid, bio-based succinic acid or bio-based sebacic acid, and further preferably comprises a combination of bio-based succinic acid and bio-based sebacic acid.
Preferably, the chain extender comprises a C2 to C12 (e.g., C4, C6, C8, C10, or C12, etc.) small molecule diol.
Preferably, the C2-C12 small molecule dihydric alcohol comprises any one of ethylene glycol, propylene glycol, butanediol or hexanediol or a combination of at least two of the ethylene glycol, the propylene glycol, the butanediol and the hexanediol.
In a second aspect, the present invention provides a process for the preparation of a hydroxy compound as described in the first aspect, which comprises: and mixing the vegetable oil polyol A, the bio-based polyester polyol A and the chain extender to obtain the hydroxyl compound.
In a third aspect, the invention provides a two-component solvent-free polyurethane resin, and the preparation raw materials of the two-component solvent-free polyurethane resin comprise a material A, a material B and a filler;
the material A comprises a hydroxy compound as described in the first aspect;
the material B comprises a bio-based polyurethane prepolymer.
Preferably, the raw materials for preparing the bio-based polyurethane prepolymer comprise diisocyanate and bio-based polyol.
Preferably, the weight percentage content of NCO in the bio-based polyurethane prepolymer is 15-25%, such as 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23% or 24%.
Preferably, the bio-based polymeric polyol comprises vegetable oil polyol B and/or bio-based polyester polyol B.
Preferably, the mass ratio of the material A to the material B is (50-150), for example, 100.
Preferably, the raw materials for preparing the two-component solvent-free polyurethane resin further comprise any one or a combination of at least two of a catalyst, a foaming agent or silicone oil.
Preferably, the catalyst comprises a bismuth zinc composite catalyst.
Preferably, the filler comprises plant residue.
In a fourth aspect, the present invention provides synthetic leather comprising the two-component solvent-free polyurethane resin according to the third aspect.
Preferably, the two-component solvent-free polyurethane resin serves as a bonding layer of the synthetic leather.
In a fifth aspect, the present invention is a method for preparing the synthetic leather according to the fourth aspect, the method comprising: mixing the material A in the two-component solvent-free polyurethane resin and an optional catalyst, adding a filler for mixing, adding the material B for mixing, uniformly coating the mixture on a surface layer for foaming reaction, attaching base cloth, and curing to obtain the synthetic leather.
Preferably, the temperature of the foaming reaction is 80 to 130 ℃, such as 90 ℃,100 ℃, 110 ℃ or 120 ℃ and the like.
Preferably, the time of the foaming reaction is 2 to 10min, such as 3min, 4min, 5min, 6min, 7min, 8min or 9 min.
Preferably, the curing temperature is 100 to 160 ℃, such as 110 ℃, 120 ℃, 130 ℃, 140 ℃, 150 ℃ or the like.
Compared with the prior art, the invention has the following beneficial effects:
(1) The hydroxyl compound for preparing the two-component solvent-free polyurethane resin comprises a combination of vegetable oil polyol A, bio-based polyester polyol A and a chain extender; when the hydroxyl compound is used for preparing polyurethane resin, the influence of adding the filler in the preparation process is small, the hydroxyl compound has proper viscosity (1200-2702 CPS/25 ℃), polar substances in the bio-based filler are not easy to dissolve out of the hydroxyl compound, the addition amount of the filler can be increased to 100%, and when the hydroxyl compound is applied to a preparation raw material of a synthetic leather bonding layer, the hydroxyl compound has strong hydrophobicity, the influence of double-component reaction caused by the dissolution of the polar substances in an aqueous surface layer can be effectively prevented, and the excellent bonding performance with the surface layer is further realized (the peeling strength is up to 51-84N/2.5 cm).
(2) Meanwhile, each component in the hydroxyl composition is a degradable material, so that the prepared polyurethane resin has good biodegradability (the biodegradation rate is 90-98%), and further the further prepared synthetic leather has environmental protection.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
The detailed information of the raw materials related to the embodiment of the present invention is as follows:
castor oil polyol: refined first-grade castor oil from Guangzhou Shi chemical company;
palm oil polyol: maskimi, malaysia, inc., PKF 3000 brand product;
bio-based polyester polyol A1: the molecular weight is 2000, and the bio-based succinic acid and the bio-based sebacic acid with the mass ratio of 1.17 are reacted with 1, 3-propylene glycol to obtain the bio-based succinic acid and the bio-based sebacic acid;
bio-based polyester polyol A2: the molecular weight is 2000, and the bio-based succinic acid is obtained by reacting bio-based succinic acid with 1, 3-propylene glycol;
diisocyanate: wanhua chemical MDI;
carbodiimide-uretonimine modified MDI: wanhua MDI-100HL.
Example 1
A two-component solvent-free polyurethane resin is prepared from the following raw materials, by weight, 100 parts of a material A, 100 parts of a material B, 0.25 part of a catalyst and 100 parts of a filler;
wherein the material A comprises the following components in parts by weight:
castor oil polyhydric alcohol 80 weight portions
20 parts by weight of bio-based polyester polyol A1
10 parts by weight of 1, 3-propanediol;
the material B is a bio-based polyurethane prepolymer, wherein the mass percentage of NCO groups is 20 percent,
the preparation method of the bio-based polyurethane prepolymer comprises the following steps: reacting 35 parts by weight of bio-based polyester polyol A1, 55 parts by weight of MDI and 10 parts by weight of carbodiimide-uretonimine modified MDI at 70 ℃ for 3.5 hours under the protection of nitrogen to obtain a bio-based polyurethane prepolymer;
the catalyst comprises 0.05 part by weight of bismuth neodecanoate and 0.2 part by weight of zinc neodecanoate;
the filler is bio-based wood flour.
Example 2
A double-component solvent-free polyurethane resin comprises the following preparation raw materials in parts by weight: 100 parts by weight of material A, 100 parts by weight of material B, 0.25 part by weight of catalyst and 100 parts by weight of filler;
wherein the material A comprises the following components in parts by weight:
palm oil polyol 70 parts by weight
30 parts by weight of bio-based polyester polyol A1
1, 3-propylene glycol;
the material B is a bio-based polyurethane prepolymer, wherein the mass percentage of NCO groups is 20%,
the preparation method of the bio-based polyurethane prepolymer comprises the following steps: reacting 5 parts by weight of castor oil polyol, 30.5 parts by weight of bio-based polyester polyol A1, 54.5 parts by weight of MDI and 10 parts by weight of carbodiimide-uretonimine modified MDI at 70 ℃ for 3.5 hours under the protection of nitrogen to obtain a bio-based polyurethane prepolymer;
the catalyst comprises 0.05 part by weight of bismuth neodecanoate and 0.2 part by weight of zinc neodecanoate;
the filler is bio-based wood flour.
Example 3
A two-component solvent-free polyurethane resin comprises the following preparation raw materials in parts by weight: 100 parts by weight of material A, 100 parts by weight of material B, 0.25 part by weight of catalyst and 100 parts by weight of filler;
wherein the material A comprises the following components in parts by weight:
90 parts by weight of castor oil polyhydric alcohol
10 parts by weight of bio-based polyester polyol A1
20 parts by weight of 1, 3-propanediol;
the material B is a bio-based polyurethane prepolymer, wherein the mass percentage of NCO groups is 20 percent,
the preparation method of the polyurethane prepolymer comprises the following steps: reacting 10 parts by weight of castor oil polyol, 26 parts by weight of bio-based polyester polyol A1, 54 parts by weight of MDI and 10 parts by weight of carbodiimide-uretonimine modified MDI at 70 ℃ for 3.5 hours under the protection of nitrogen to obtain a bio-based polyurethane prepolymer;
the catalyst comprises 0.05 part by weight of bismuth neodecanoate and 0.2 part by weight of zinc neodecanoate;
the filler is bio-based wood flour.
Example 4
A two-component solvent-free polyurethane resin is different from the polyurethane resin in the embodiment 1 only in that the addition amount of the bio-based polyester polyol A1 in the material A is 10 parts by weight, and other components, the use amount and the preparation method are the same as those in the embodiment 1.
Example 5
A two-component solvent-free polyurethane resin, which is different from example 1 only in that the bio-based polyester polyol A1 in the material a is added in an amount of 30 parts by weight, and other components, use amounts and preparation methods are the same as those of example 1.
Example 6
A two-component solvent-free polyurethane resin, which is different from example 1 only in that a bio-based polyurethane polyol A2 is used to replace a bio-based polyurethane polyol A1 in a material a and a material B, and other components, amounts and preparation methods are the same as those of example 1.
Comparative example 1
A two-component solvent-free polyurethane resin is different from the polyurethane resin in example 1 only in that the addition amount of the bio-based polyester polyol A1 in the material A is 5 parts by weight, and other components, the use amounts and the preparation method are the same as those in example 1.
Comparative example 2
A two-component solvent-free polyurethane resin is different from the polyurethane resin in example 1 only in that the addition amount of the bio-based polyester polyol A1 in the material A is 40 parts by weight, and other components, the use amounts and the preparation method are the same as those in example 1.
Comparative example 3
A two-component solvent-free polyurethane resin is prepared by replacing castor oil polyol in material A with Coligene GP-1000 (3 functionality, 1000 molecular weight), and the other components, the using amount and the preparation method are the same as those in example 1.
Comparative example 4
A combined material for preparing two-component solvent-free polyurethane resin adopts Huafeng polyester PE-7018 to replace bio-based polyester polyol A1 in a material A and a material B, and other components, the using amount and the preparation method are the same as those in example 1.
Application example 1
Synthetic leather, the preparation method of which comprises: the material A and the catalyst in the two-component solvent-free polyurethane resin provided by the embodiment 1 are mixed and stirred for 1min, then the filler (bio-based wood powder) is added and stirred for 5min, after the mixture is uniformly stirred, the material B is added and mixed for 15s at normal temperature, then the mixture is uniformly coated on the Huafeng waterborne polyurethane surface layer JF-PDY-851HY, the foaming reaction is carried out at the temperature of 100 ℃, the base cloth is attached at the maximum viscosity, and finally the mixture is cured and molded at the temperature of 150 ℃ to obtain the synthetic leather.
Application examples 2 to 6
Synthetic leather is different from application example 1 only in that the material a, the material B, the catalyst and the filler in the two-component solvent-free polyurethane resin provided in example 1 are replaced with the material a, the material B, the catalyst and the filler in the two-component solvent-free polyurethane resin provided in examples 2 to 6, respectively, and other conditions and steps are the same as those in application example 1.
Comparative application examples 1 to 4
Synthetic leather is different from application example 1 only in that the material A, the material B, the catalyst and the filler in the two-component solvent-free polyurethane resin provided in example 1 are replaced by the material A, the material B, the catalyst and the filler in the two-component solvent-free polyurethane resin provided in comparative examples 1 to 4, respectively, and other conditions and steps are the same as those in application example 1.
And (3) performance testing:
(1) Rebound resilience: folding synthetic leather with the size of 10 multiplied by 10cm in half, pressing the synthetic leather for 5 hours at 70 ℃ by using a 5kg weight, and standing the synthetic leather for 1 hour to observe the crease recovery condition;
(2) Peel strength: testing was carried out according to GB/T1040.3-2006 standard.
(3) Biodegradability: the disintegration degree is calculated according to the test of GB/T19811-2005, the test period is 12 weeks.
The synthetic leathers obtained in application examples 1 to 6 and comparative application examples 1 to 4 were tested according to the test method, and the test results are shown in table 1:
TABLE 1
The rebound performance can not only show the rebound effect of leather, but also can show the influence of the addition of the filler to resin reaction curing, and the better the rebound performance is, the smaller the influence of the addition of the filler to the resin is.
Specifically, the method comprises the following steps:
(1) According to the data of application examples 1-5, the synthetic leather prepared by further preparing the two-component solvent-free polyurethane resin prepared in the formula proportion range provided by the invention is normal in curing, good in rebound resilience, and also extremely high in physical property (peel strength of not less than 60N/2.5 cm) and biodegradation rate of not less than 90%;
from a comparison of the data from application example 6 and application example 1, the peel strength of the polyurethane further prepared using the bio-based polyester polyol prepared using succinic acid alone was lower than that of the polyurethane resin further prepared using the bio-based polyester polyol prepared using succinic acid in combination with sebacic acid.
(2) From the comparison of the data of application example 1 and comparative application example 1, the low addition amount of the bio-based polyester polyol can cause the obvious reduction of the peel strength and the biodegradation performance of the finally prepared synthetic leather.
(3) From the comparison of the data of application example 1 and comparative application example 2, the addition amount of the bio-based polyester polyol is higher, and although the prepared synthetic leather has better performances in peel strength and biodegradability, the viscosity of the material A is too high, so that the sample preparation and production stability are affected.
(4) From the comparison of the data of the application example 1 and the comparative application example 3, after the vegetable oil polyol is replaced by the common polyether polyol, the hydrophobic property of the prepared polyurethane resin is reduced, so that the reaction curing in the preparation process of the synthetic leather is poor, the recovery property of the synthetic leather is poor, and the binding property with the water-based surface layer is greatly reduced.
(5) From the comparison of the data of application example 1 and comparative application example 4, the use of ordinary polyester polyol instead of bio-based polyester polyol can result in the significant decrease of the bonding property and the biodegradation performance of the bonding layer and the aqueous surface layer in the prepared synthetic leather.
The applicant states that the present invention is illustrated by the above examples to a hydroxy composition for preparing a two-component solvent-free polyurethane resin and its application, but the present invention is not limited to the above examples, that is, it is not meant that the present invention must be implemented by relying on the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. The hydroxyl compound for preparing the two-component solvent-free polyurethane resin is characterized by comprising the following components in parts by weight:
70-90 parts by weight of vegetable oil polyalcohol A
10-30 parts by weight of bio-based polyester polyol A
1-20 parts of chain extender.
2. The hydroxyl compound of claim 1 wherein the vegetable oil polyol a comprises any one of castor oil polyol, soybean oil polyol, or palm oil polyol, or a combination of at least two thereof;
preferably, the functionality of the vegetable oil polyol a is not less than 2.
3. Hydroxyl compound according to claim 1 or 2, characterized in that the functionality of the biobased polyester polyol a is 2 to 3;
preferably, the hydroxyl value of the bio-based polyester polyol A is 28-112 mkgKOH/g;
preferably, the raw materials for preparing the bio-based polyester polyol A comprise bio-based dihydric alcohol and bio-based dibasic acid;
preferably, the bio-based diol comprises bio-based 1, 3-propanediol and/or bio-based 1, 4-butanediol, further preferably bio-based 1, 3-propanediol;
preferably, the bio-based dibasic acid comprises any one of or a combination of at least two of bio-based dimer acid, bio-based succinic acid or bio-based sebacic acid, and further preferably comprises a combination of bio-based succinic acid and bio-based sebacic acid.
4. A hydroxy compound according to any of claims 1 to 3, characterised in that the chain extender comprises a C2-C12 small molecule diol;
preferably, the C2-C12 small molecule diol comprises any one of ethylene glycol, propylene glycol, butanediol or hexanediol or a combination of at least two of the ethylene glycol, the propylene glycol, the butanediol and the hexanediol.
5. A process for the preparation of a hydroxy compound according to any one of claims 1 to 4, which comprises: and mixing the vegetable oil polyol A, the bio-based polyester polyol A and the chain extender to obtain the hydroxyl compound.
6. A two-component solvent-free polyurethane resin is characterized in that the preparation raw materials of the two-component solvent-free polyurethane resin comprise a material A, a material B and a filler;
the A moiety comprises a hydroxy compound as defined in any one of claims 1 to 4;
and the material B comprises a bio-based polyurethane prepolymer.
7. The two-component solvent-free polyurethane resin as claimed in claim 6, wherein the raw materials for preparing the bio-based polyurethane prepolymer comprise diisocyanate and bio-based polyol;
preferably, the mass percentage of NCO in the bio-based polyurethane prepolymer is 15-25%;
preferably, the bio-based polymeric polyol comprises vegetable oil polyol B and/or bio-based polyester polyol B;
preferably, the mass ratio of the material A to the material B is 100 (50-150);
preferably, the raw materials for preparing the two-component solvent-free polyurethane resin further comprise any one or a combination of at least two of a catalyst, a foaming agent or silicone oil;
preferably, the catalyst comprises a bismuth zinc composite catalyst;
preferably, the filler comprises plant residue.
8. Synthetic leather comprising the two-component solvent-free polyurethane resin according to claim 6 or 7.
9. A method of preparing synthetic leather according to claim 8, wherein the method comprises: mixing the material A in the two-component solvent-free polyurethane resin according to claim 6 or 7 and optionally a catalyst, adding a filler for mixing, then adding the material B for mixing, then uniformly coating on a surface layer for foaming reaction, attaching a base fabric, and curing to obtain the synthetic leather.
10. The method of claim 9, wherein the temperature of the foaming reaction is 80 to 130 ℃;
preferably, the time of the foaming reaction is 2-10 min;
preferably, the curing temperature is 100 to 160 ℃.
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| CN202310056867.8A CN115975143A (en) | 2023-01-16 | 2023-01-16 | Hydroxyl compound for preparing two-component solvent-free polyurethane resin and application thereof |
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| CN202310056867.8A CN115975143A (en) | 2023-01-16 | 2023-01-16 | Hydroxyl compound for preparing two-component solvent-free polyurethane resin and application thereof |
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