CN114874409A - Polyether polyol-based polyurethane resin and preparation method thereof - Google Patents
Polyether polyol-based polyurethane resin and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a polyurethane resin based on polyether polyol and a preparation method thereof, belonging to the technical field of high polymer materials. The polyurethane resin is prepared from polyether polyol, organic silicon polyol, a catalyst, diisocyanate and a chain extender. The organic silicon polyol is hyperbranched organic silicon which takes polyalcohol polysiloxane as a core and elastic elements as branched chains, has the characteristics of heat resistance and flame retardance of siloxane and the self-repairing elastic characteristic of disulfide bonds in the elastic elements, so that the heat resistance and the flame retardance of polyether polyurethane can be greatly improved by introducing the organic silicon polyol into a polyurethane resin reaction substrate, and the polyether polyurethane has the intrinsic repairing elastic capacity; meanwhile, the organic silicon polyol is of a hyperbranched structure, has the characteristics of low viscosity and easiness in processing, and keeps the characteristic of easiness in processing of polyurethane based on polyether polyol.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a polyurethane resin based on polyether polyol and a preparation method thereof.
Background
In the molecular structure of polyether polyol, ether bond cohesive energy is low, and the polyether polyol polyurethane is easy to rotate, so that the polyether polyol polyurethane has good low-temperature flexibility, excellent hydrolysis resistance, low viscosity of a raw material system and excellent processability, and is widely applied to the fields of polyurethane synthetic leather, polyurethane foam materials, polyurethane elastic materials and the like. However, due to the characteristic of low cohesive energy of ether bonds in polyether polyol, polyurethane resin prepared from polyether polyol has poor heat resistance, and the elasticity and toughness of the polyurethane resin are easy to lose efficacy at high temperature. It is often desirable to introduce additional molecular groups or chains or fillers to ameliorate the above-mentioned disadvantages. The compatibility of the filler and a polyurethane material system is poor, so that the improvement effect of the performance of the polyurethane material is not very ideal, for example, the material has low heat resistance and low durability due to the agglomeration of the filler. In comparison, the improvement effect of introducing other molecular groups or molecular chains is more desirable.
For example, Chinese patent CN109705718B discloses a phenolic resin modified polyurethane/polyurea coating and a preparation method thereof. The phenolic resin modified polyurethane/polyurea coating comprises a component A and a component B, wherein the component A comprises phenolic resin, halogenated polyether polyol and isocyanate, and the component B comprises polyether polyol A, amine-terminated polyether B and an amine chain extender; the halogenated polyether polyol is chlorinated polyether polyol or brominated polyether polyol, the functionality is 2.5-3.5, the relative molecular mass is 500-2000, and the halogen content is 8-30 wt%. In the invention, halogenated polyether polyol is added to replace polyether polyol, and halogen is introduced to improve the heat resistance and the flame retardance of the correspondingly obtained polyurethane resin, so that the heat resistance and the flame retardance of the coating are enhanced finally. Although the heat resistance of the polyurethane material based on polyether polyol is improved in the manner, the polyurethane resin contains more halogen, and secondary pollution smoke is easily generated in the combustion process, so that the environmental protection property is low.
Therefore, the present invention provides a heat-resistant and environment-friendly polyurethane resin based on polyether polyol, which has a low viscosity characteristic and can be applied to the fields of coatings, elastic materials, and the like.
Disclosure of Invention
The invention aims to provide a polyurethane resin based on polyether polyol and a preparation method thereof, so as to solve the problems in the background art.
The purpose of the invention can be realized by the following technical scheme:
a polyether polyol-based polyurethane resin is prepared from polyether polyol, organosilicon polyol, catalyst, diisocyanate and chain extender.
Further, the mass ratio of the polyether polyol to the organosilicon polyol to the catalyst to the diisocyanate to the chain extender is 100:15-25:18-35:1-1.5: 2-4.5.
Further, the polyether polyol has a molecular weight of 1000-4000 and a functionality of 2-3.
Further, the catalyst is one or a mixture of several of dibutyltin dilaurate, stannous octoate, dibutyltin bis (dodecyl sulfur) and dibutyltin diacetate in any ratio.
Further, the diisocyanate is one or a mixture of several of diphenylmethane diisocyanate, toluene diisocyanate and hexamethylene diisocyanate in any ratio.
Further, the chain extender is formed by mixing trimethylolpropane and dimethylolpropionic acid according to the mass ratio of 1-1.5: 2-3.
Further, the silicone polyol is prepared by the following steps:
step A1, mixing dimethyl 3,3' -dithiodipropionate and methanol, adding hydrazine hydrate at room temperature under stirring, stirring for reaction for 1.5h, filtering, and drying to obtain white powder; dissolving 4-carboxybenzaldehyde in isopropanol, opening condensed water, then adding white powder while stirring, heating to 70-75 ℃, stirring for reacting for 2 hours, filtering, and drying to obtain an elastic element, wherein the dosage ratio of dimethyl 3,3' -dithiodipropionate, hydrazine hydrate and 4-carboxybenzaldehyde is 0.1mol:15-20g:0.22-0.23 mol; the molecular structural formula of the elastic element is shown as follows;
step A2, mixing an elastic element and DMF, adding a condensing agent under the protection of nitrogen, opening condensed water, heating to 30-60 ℃, stirring and activating for 1-1.5h, then heating to 70-80 ℃, dropwise adding a DMF solution containing tris (hydroxymethyl) aminomethane at a speed of 2-4 drops/second, after the addition is finished, continuing stirring for 1-2h, cooling to 60 ℃, reducing the pressure, and performing rotary evaporation to remove the solvent to obtain a branched elastic element, wherein the molar ratio of the elastic element to the condensing agent to the tris (hydroxymethyl) aminomethane is 1:2:1, and the condensing agent is dicyclohexylcarbodiimide; in the reaction, the reaction of carboxyl in the elastic element and amino in the tris is utilized, the tris is introduced into the elastic element to obtain a branched elastic element, and then the molar ratio of the elastic element to the tris is controlled, so that one molecular structure of the branched elastic element contains one carboxyl and three hydroxyls;
step A3, adding dihydroxy terminated polysiloxane and catalyst P-TSA into a four-neck flask with a mechanical stirring paddle, a drying tube, a condensing tube, a nitrogen inlet and a water separator, heating to 120 ℃ under the conditions of 100 ℃, slowly dripping 2, 2-dihydromethyl propionic acid under the protection of nitrogen, continuously stirring for reacting for 2h after the dripping is finished, stopping introducing nitrogen, then stirring the mixture under-0.01 MPa to react until the acid value (KOH) of the reaction system is less than 10mg/g, stopping the reaction, cooling the mixture to room temperature, washing the mixture with water for a plurality of times, drying the mixture to obtain the poly-alcoholized polysiloxane, wherein the mass ratio of the dihydroxy terminated polysiloxane to the 2, 2-dihydromethyl propionic acid is 30-40:15-28, the mass of the catalyst P-TSA is 2-4% of that of the dihydroxy terminated polysiloxane, and the relative molecular mass of the dihydroxy terminated polysiloxane is 400-600-; in the reaction, dihydroxy-terminated polysiloxane and 2, 2-dihydromethyl propionic acid are subjected to condensation reaction of hydroxyl and carboxyl under the action of a catalyst, the adding mass of the dihydroxy-terminated polysiloxane and the 2, 2-dihydromethyl propionic acid is controlled, the molar mass ratio of the dihydroxy-terminated polysiloxane to the 2, 2-dihydromethyl propionic acid is less than 1:1, and the dihydroxy-terminated polysiloxane is reacted to prepare the poly-alcoholized polysiloxane, wherein the hydroxy functionality of the poly-alcoholized polysiloxane is 3-4;
step A4, mixing the polyalcohol polysiloxane, the branched elastic element and the catalyst P-TSA, heating to 140 ℃ under the protection of nitrogen, stirring for reaction for 2 hours, then removing the nitrogen, carrying out reduced pressure reaction for 2 hours, then adding the branched elastic element and the catalyst P-TSA, then introducing the nitrogen, heating to 150 ℃, stirring for reaction for 2 hours, then removing the nitrogen, carrying out reduced pressure reaction for 2 hours, cooling, discharging to obtain the organosilicon polyol, wherein the dosage ratio of the polyalcohol polysiloxane to the branched elastic element added for the first time is 7-10:14-18, and the dosage of the branched elastic element added for the second time is equal to the dosage of the branched elastic element added for the first time.
In step a4, a polyhydroxy group and a carboxyl group in a branched elastic basic unit (AB3 type monomer, a is carboxyl group, B is hydroxyl group) in a polyhydric alcoholized polysiloxane are reacted to obtain a first generation polymerized organosilicon (with hydroxyl end), then a branched elastic basic unit is added, the end-capped hydroxyl group is reacted with the carboxyl group to obtain a second generation organosilicon, namely organosilicon polyol, which is known to be a hyperbranched organosilicon using a polyhydric alcoholized polysiloxane (with silicon-oxygen bond as the main core) and an elastic basic unit as the branched chain, and has the heat resistance and flame retardant characteristics of siloxane and the self-repairing elastic characteristics of disulfide bond and acylhydrazone bond in the elastic basic unit, wherein the disulfide bond has lower bond energy, is a reversible dynamic chemical bond which is simple, mild in reaction condition and fast in reversible exchange rate, is a functional chemical bond introduced by a commonly used self-repairing material, and the acylhydrazone bond has dynamic reversible reaction under an acidic condition, the introduction of the organic silicon polyol can improve the high elastic performance of the material under an acidic condition, so that the heat resistance and the flame retardant performance of the polyether polyurethane can be greatly improved by introducing the organic silicon polyol into a polyurethane resin reaction substrate, the intrinsic repair elastic capability of the polyether polyurethane is endowed, and the elastic heat resistance of the obtained polyurethane is further improved.
A method for preparing a polyurethane resin based on polyether polyol, comprising the steps of: uniformly mixing polyether polyol, a chain extender and diisocyanate, adding a half of catalyst at 70-80 ℃ under the protection of nitrogen, stirring for reacting for 2-3h, adding organic silicon polyol and the rest of catalyst, continuously stirring for reacting for 3-6h, transferring to an extruder while the mixture is hot, and extruding and granulating to obtain the polyurethane resin.
The invention has the beneficial effects that:
according to the invention, the organic silicon polyol is introduced into the polyurethane reaction substrate based on the polyether polyol, and the heat resistance and flame retardance of the polyurethane based on the polyether polyol are improved by virtue of the heat resistance enhancement and flame retardance enhancement characteristics of an organic silicon chain, and the method is introduced without halogen and has the characteristics of environmental protection and safety; secondly, the organic silicon polyol contains a large number of elastic elements, so that the polyurethane based on the polyether polyol has excellent intrinsic self-repairing capability, the elastic heat resistance of the polyurethane based on the polyether polyol is improved, and meanwhile, the organic silicon polyol is of a hyperbranched structure, has the characteristics of low viscosity and easiness in processing, and keeps the characteristic of easiness in processing of the polyurethane based on the polyether polyol.
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.
Example 1
Preparation of silicone polyol:
step A1, mixing 0.1mol of dimethyl 3,3' -dithiodipropionate with 40mL of methanol, adding 15g of hydrazine hydrate at room temperature under stirring, reacting for 1.5h under stirring, filtering, and drying to obtain white powder; dissolving 0.22mol of 4-carboxybenzaldehyde in 60mL of isopropanol, opening condensed water, then adding white powder while stirring, heating to 70 ℃, stirring for reacting for 2 hours, carrying out suction filtration, and drying to obtain an elastic element;
step A2, mixing 0.1mol of elastic element and 70mL of DMF, adding 0.2mol of condensing agent under the protection of nitrogen, opening condensed water, heating to 30 ℃, stirring and activating for 1.5h, then heating to 70 ℃, dropwise adding 50mL of DMF solution containing 0.1mol of tris (hydroxymethyl) aminomethane at the speed of 2 drops/second, continuing stirring for 1h after the addition is finished, reducing the temperature to 60 ℃, and performing reduced pressure rotary evaporation to remove the solvent to obtain the branched elastic element, wherein the condensing agent is dicyclohexylcarbodiimide;
step A3, adding 30g of dihydroxy-terminated polysiloxane and 0.6g of catalyst P-TSA into a four-neck flask with a mechanical stirring paddle, a drying pipe, a condensing pipe, a nitrogen inlet and a water separator, heating to 100 ℃, slowly dropwise adding 15g of 2, 2-dihydromethyl propionic acid under the protection of nitrogen, continuing stirring for reaction for 2 hours after the addition is finished, stopping introducing nitrogen, then stirring for reaction under-0.01 MPa until the acid value (KOH) of a reaction system is less than 10mg/g, cooling to room temperature, washing with water for several times, drying, and obtaining poly-alcoholized polysiloxane, wherein the relative molecular mass of the dihydroxy-terminated polysiloxane is 400-600-;
step A4, mixing 7g of polyhydric alcoholized polysiloxane, 14-g of branched elastic basic element and 0.2g of catalyst P-TSA, heating to 140 ℃ under the protection of nitrogen, stirring for reaction for 2 hours, then removing the nitrogen, carrying out reduced pressure reaction for 2 hours, then adding 14g of branched elastic basic element and 0.2g of catalyst P-TSA, then introducing the nitrogen, heating to 150 ℃, stirring for reaction for 2 hours, then removing the nitrogen, carrying out reduced pressure reaction for 2 hours, cooling, discharging, and obtaining the organic silicon polyol.
Example 2
Preparation of silicone polyol:
step A1, mixing 0.1mol of dimethyl 3,3' -dithiodipropionate with 40mL of methanol, adding 20g of hydrazine hydrate at room temperature under stirring, reacting for 1.5h under stirring, filtering, and drying to obtain white powder; dissolving 0.23mol of 4-carboxybenzaldehyde in 60mL of isopropanol, opening condensed water, then adding white powder while stirring, heating to 75 ℃, stirring for reacting for 2 hours, carrying out suction filtration, and drying to obtain an elastic element;
step A2, mixing 0.1mol of elastic element and 70mL of DMF, adding 0.2mol of condensing agent under the protection of nitrogen, opening condensed water, heating to 60 ℃, stirring and activating for 1h, then heating to 80 ℃, dropwise adding 50mL of DMF solution containing 0.1mol of tris (hydroxymethyl) aminomethane at a speed of 4 drops/second, continuing stirring for 2h after the addition is finished, reducing the temperature to 60 ℃, reducing the pressure, and performing rotary evaporation to remove the solvent to obtain the branched elastic element, wherein the condensing agent is dicyclohexylcarbodiimide;
step A3, adding 40g of dihydroxy-terminated polysiloxane and 1.6g of catalyst P-TSA into a four-neck flask with a mechanical stirring paddle, a drying pipe, a condensing pipe, a nitrogen inlet and a water separator, heating to 120 ℃, slowly dropwise adding 28g of 2, 2-dihydromethyl propionic acid under the protection of nitrogen, continuing stirring for reaction for 2 hours after the addition is finished, stopping introducing nitrogen, then stirring for reaction under-0.01 MPa until the acid value (KOH) of a reaction system is less than 10mg/g, cooling to room temperature, washing with water for several times, drying, and obtaining poly-alcoholized polysiloxane, wherein the relative molecular mass of the dihydroxy-terminated polysiloxane is 400-600-;
step A4, mixing 10g of polyhydric alcoholized polysiloxane, 18g of branched elastic basic element and 0.6g of catalyst P-TSA, heating to 140 ℃ under the protection of nitrogen, stirring for reaction for 2 hours, then removing the nitrogen, carrying out reduced pressure reaction for 2 hours, then adding 18g of branched elastic basic element and 0.6g of catalyst P-TSA, then introducing the nitrogen, heating to 150 ℃, stirring for reaction for 2 hours, then removing the nitrogen, carrying out reduced pressure reaction for 2 hours, cooling, discharging, and obtaining the organic silicon polyol.
Example 3
Preparation of a polyurethane resin based on polyether polyols:
step one, preparing raw materials according to the following mass ratio: the mass ratio of the polyether polyol, the organosilicon polyol prepared in example 1, the catalyst, the diisocyanate, and the chain extender is 100:15:18:1: 2; the molecular weight of the polyether polyol is 1000-4000, and the functionality is 2-3; the catalyst is dibutyltin dilaurate; the diisocyanate is diphenylmethane diisocyanate; the chain extender is formed by mixing trimethylolpropane and dimethylolpropionic acid according to the mass ratio of 1: 2;
and step two, uniformly mixing polyether polyol, a chain extender and diisocyanate, adding one half of catalyst at 70 ℃ under the protection of nitrogen, stirring for reacting for 2 hours, adding organic silicon polyol and the rest of catalyst, continuously stirring for reacting for 3 hours, transferring to an extruder while the mixture is hot, and extruding and granulating to obtain the polyurethane.
Example 4
Preparation of a polyurethane resin based on polyether polyols:
step one, preparing raw materials according to the following mass ratio: the mass ratio of the polyether polyol, the organosilicon polyol prepared in example 1, the catalyst, the diisocyanate, and the chain extender is 100:20:25:1: 3; the molecular weight of the polyether polyol is 1000-4000, and the functionality is 2-3; the catalyst is stannous octoate; the diisocyanate is toluene diisocyanate; the chain extender is formed by mixing trimethylolpropane and dimethylolpropionic acid according to the mass ratio of 1.5: 3;
and step two, uniformly mixing polyether polyol, a chain extender and diisocyanate, adding one half of catalyst at 80 ℃ under the protection of nitrogen, stirring for reaction for 3 hours, adding organic silicon polyol and the rest of catalyst, continuously stirring for reaction for 6 hours, transferring to an extruder while the mixture is hot, and extruding and granulating to obtain the polyurethane.
Example 5
Preparation of a polyurethane resin based on polyether polyols:
step one, preparing raw materials according to the following mass ratio: the mass ratio of the polyether polyol, the silicone polyol prepared in example 1, the catalyst, the diisocyanate, and the chain extender is 100:25:35:1.5: 4.5; the molecular weight of the polyether polyol is 1000-4000, and the functionality is 2-3; the catalyst is dibutyltin dilauryl sulfide; the diisocyanate is hexamethylene diisocyanate; the chain extender is formed by mixing trimethylolpropane and dimethylolpropionic acid according to the mass ratio of 1: 3;
and step two, uniformly mixing polyether polyol, a chain extender and diisocyanate, adding one half of catalyst at 80 ℃ under the protection of nitrogen, stirring for reacting for 2 hours, adding organic silicon polyol and the rest of catalyst, continuously stirring for reacting for 3 hours, transferring to an extruder while the mixture is hot, and extruding and granulating to obtain the polyurethane.
Comparative example 1
Preparation of a polyurethane resin based on polyether polyols: the organosilicon polyol was replaced by a bishydroxy terminated polysiloxane as compared with example 3, and the relative molecular mass of the bishydroxy terminated polysiloxane was 400-600, the rest being the same.
Comparative example 2
Preparation of a polyurethane resin based on polyether polyols: the silicone polyol was replaced by the branched elastomer prepared in step A2 of example 1, the rest being the same, compared to example 4.
Example 6
The polyurethanes obtained in examples 3 to 5 and comparative examples 1 to 2 were subjected to the following property tests:
tensile property: testing according to ASTM D638;
vicat soft temperature: testing according to the GB/T1633 standard;
pendulum impact performance: testing according to ASTM D256 at-20 deg.C, -10 deg.C, 0 deg.C, 20 deg.C, 40 deg.C, 80 deg.C, 100 deg.C and 120 deg.C;
the above tests are shown in tables 1 and 2.
TABLE 1
| Tensile Properties | Elongation at break | Vicat soft temperature | |
| Example 3 | 17.1Mpa | 568.6％ | 149℃ |
| Example 4 | 18.5Mpa | 589.3％ | 153℃ |
| Example 5 | 19.1Mpa | 591.8％ | 154℃ |
| Comparative example 1 | 15.9Mpa | 534.5％ | 141℃ |
| Comparative example 2 | 16.1Mpa | 493.2％ | 126℃ |
TABLE 2
As can be seen from the data in tables 1 and 2, the polyurethane provided by the present invention has good tensile properties and toughness, and is stable against heat.
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 foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (9)
1. A polyurethane resin based on polyether polyol, characterized in that: comprises polyether polyol, organic silicon polyol, a catalyst, diisocyanate and a chain extender;
the silicone polyol is prepared by the following steps:
mixing the polyhydric alcoholization polysiloxane, the branched elastic element and the catalyst P-TSA, heating to 140 ℃ under the protection of nitrogen, stirring for reaction for 2 hours, then removing the nitrogen, carrying out reduced pressure reaction for 2 hours, then adding the branched elastic element and the catalyst P-TSA, introducing the nitrogen, heating to 150 ℃, stirring for reaction for 2 hours, then removing the nitrogen, carrying out reduced pressure reaction for 2 hours, cooling, discharging, and obtaining the organic silicon polyol.
2. A polyether polyol-based polyurethane resin according to claim 1, wherein: the mass ratio of the polyether polyol to the organic silicon polyol to the catalyst to the diisocyanate to the chain extender is 100:15-25:18-35:1-1.5: 2-4.5.
3. A polyether polyol-based polyurethane resin according to claim 1, wherein: the ratio of the amount of the said polyhydric alcoholized polysiloxane to the amount of the branched elastomer is 50-80:10-18, and the amount of the branched elastomer added again is equal to the amount of the branched elastomer added for the first time.
4. A polyether polyol-based polyurethane resin according to claim 1, wherein: the polyalcohol polysiloxane is prepared by the following steps:
after the dihydroxy-terminated polysiloxane and a catalyst P-TSA are mixed, the mixture is heated to 120 ℃ and is slowly dripped with 2, 2-dihydromethyl propionic acid under the protection of nitrogen, the mixture is continuously stirred and reacts for 2 hours after the addition, the nitrogen introduction is stopped, then the mixture is stirred and reacts under the pressure of minus 0.01MPa until the acid value KOH of a reaction system is less than 10mg/g, the reaction is stopped, the mixture is cooled to the room temperature, washed for a plurality of times and dried, and the poly-alcoholized polysiloxane is obtained.
5. A polyether polyol-based polyurethane resin according to claim 4, wherein: the mass ratio of the dihydroxy terminated polysiloxane to the 2, 2-dihydromethyl propionic acid is 30-40:15-28, and the relative molecular mass of the dihydroxy terminated polysiloxane is 400-600-.
6. A polyether polyol-based polyurethane resin according to claim 1, wherein: the branched elastic element is prepared by the following steps:
step A1, mixing dimethyl 3,3' -dithiodipropionate and methanol, adding hydrazine hydrate at room temperature under stirring, reacting for 1.5 hours under stirring, filtering, and drying to obtain white powder; dissolving 4-carboxybenzaldehyde in isopropanol, opening condensed water, adding white powder under stirring, heating to 70-75 ℃, stirring for reacting for 2h, filtering, and drying to obtain elastic elements;
step A2, mixing the elastic element and DMF, adding a condensing agent under the protection of nitrogen, opening condensed water, heating to 30-60 ℃, stirring and activating for 1-1.5h, then heating to 70-80 ℃, dropwise adding a DMF solution containing tris (hydroxymethyl) aminomethane, continuing stirring for 1-2h after adding, and carrying out reduced pressure rotary evaporation to remove the solvent, thus obtaining the branched elastic element.
7. A polyether polyol-based polyurethane resin according to claim 6, wherein: in the step A1, the dosage ratio of the dimethyl 3,3' -dithiodipropionate, the hydrazine hydrate and the 4-carboxybenzaldehyde is 0.1mol:15-20g:0.22-0.23 mol.
8. A polyether polyol-based polyurethane resin according to claim 6, wherein: in the step A2, the molar ratio of the elastic element to the condensing agent to the tris (hydroxymethyl) aminomethane is 1:2:1, and the condensing agent is dicyclohexylcarbodiimide.
9. The method for preparing a polyether polyol-based polyurethane resin according to claim 8, wherein: the method comprises the following steps:
uniformly mixing polyether polyol, a chain extender and diisocyanate, adding a half of catalyst at 70-80 ℃ under the protection of nitrogen, stirring for reacting for 2-3h, adding organic silicon polyol and the rest of catalyst, continuously stirring for reacting for 3-6h, transferring to an extruder while the mixture is hot, and extruding and granulating to obtain the polyurethane resin.
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