CN117757020A - Preparation method of modified casting polyurethane - Google Patents
Preparation method of modified casting polyurethane Download PDFInfo
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- CN117757020A CN117757020A CN202311758012.6A CN202311758012A CN117757020A CN 117757020 A CN117757020 A CN 117757020A CN 202311758012 A CN202311758012 A CN 202311758012A CN 117757020 A CN117757020 A CN 117757020A
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- urushiol
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- polyurethane
- modified casting
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- 239000004814 polyurethane Substances 0.000 title claims abstract description 44
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 44
- 238000005266 casting Methods 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- QARRXYBJLBIVAK-UEMSJJPVSA-N 3-[(8e,11e)-pentadeca-8,11-dienyl]benzene-1,2-diol;3-[(8e,11e)-pentadeca-8,11,14-trienyl]benzene-1,2-diol;3-[(8e,11e,13e)-pentadeca-8,11,13-trienyl]benzene-1,2-diol;3-[(e)-pentadec-8-enyl]benzene-1,2-diol;3-pentadecylbenzene-1,2-diol Chemical compound CCCCCCCCCCCCCCCC1=CC=CC(O)=C1O.CCCCCC\C=C\CCCCCCCC1=CC=CC(O)=C1O.CCC\C=C\C\C=C\CCCCCCCC1=CC=CC(O)=C1O.C\C=C\C=C\C\C=C\CCCCCCCC1=CC=CC(O)=C1O.OC1=CC=CC(CCCCCCC\C=C\C\C=C\CC=C)=C1O QARRXYBJLBIVAK-UEMSJJPVSA-N 0.000 claims abstract description 43
- RMTXUPIIESNLPW-UHFFFAOYSA-N 1,2-dihydroxy-3-(pentadeca-8,11-dienyl)benzene Natural products CCCC=CCC=CCCCCCCCC1=CC=CC(O)=C1O RMTXUPIIESNLPW-UHFFFAOYSA-N 0.000 claims abstract description 41
- IYROWZYPEIMDDN-UHFFFAOYSA-N 3-n-pentadec-8,11,13-trienyl catechol Natural products CC=CC=CCC=CCCCCCCCC1=CC=CC(O)=C1O IYROWZYPEIMDDN-UHFFFAOYSA-N 0.000 claims abstract description 41
- DQTMTQZSOJMZSF-UHFFFAOYSA-N urushiol Natural products CCCCCCCCCCCCCCCC1=CC=CC(O)=C1O DQTMTQZSOJMZSF-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000003054 catalyst Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 229920001228 polyisocyanate Polymers 0.000 claims abstract description 9
- 239000005056 polyisocyanate Substances 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 229920005862 polyol Polymers 0.000 claims abstract description 7
- 150000003077 polyols Chemical class 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 230000005855 radiation Effects 0.000 claims abstract description 5
- 150000005846 sugar alcohols Polymers 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 15
- 238000001723 curing Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 229920000728 polyester Polymers 0.000 claims description 6
- 150000002009 diols Chemical class 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 3
- 229920000570 polyether Polymers 0.000 claims description 3
- 238000003776 cleavage reaction Methods 0.000 claims description 2
- 239000003999 initiator Substances 0.000 claims description 2
- 150000002736 metal compounds Chemical class 0.000 claims description 2
- 238000003847 radiation curing Methods 0.000 claims description 2
- 230000007017 scission Effects 0.000 claims description 2
- 230000002194 synthesizing effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 4
- 238000004073 vulcanization Methods 0.000 abstract description 4
- 239000004970 Chain extender Substances 0.000 abstract description 3
- 230000009878 intermolecular interaction Effects 0.000 abstract description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 abstract description 2
- 239000011159 matrix material Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 10
- 230000008569 process Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 235000013824 polyphenols Nutrition 0.000 description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- 238000003848 UV Light-Curing Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 125000005442 diisocyanate group Chemical group 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 125000001931 aliphatic group Chemical group 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 150000008442 polyphenolic compounds Chemical class 0.000 description 2
- 229920003225 polyurethane elastomer Polymers 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 description 2
- 150000005206 1,2-dihydroxybenzenes Chemical class 0.000 description 1
- 244000044283 Toxicodendron succedaneum Species 0.000 description 1
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000012975 dibutyltin dilaurate Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229930003811 natural phenol Natural products 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Polyurethanes Or Polyureas (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a preparation method of modified casting polyurethane. Uniformly stirring the polyalcohol, the urushiol, the catalyst and the photoinitiator to obtain a component A, uniformly stirring the polyisocyanate and the urushiol to obtain a component B, uniformly mixing the component A, B, injecting the mixture into a mold, and curing the mixture by using UV radiation after molding to obtain the modified casting polyurethane. According to the invention, urushiol is introduced into the casting polyurethane, the benzene ring and the long side chain in the urushiol structure are utilized to increase the intermolecular distance of the prepolymer polyol, and the intermolecular interaction force is weakened, so that the viscosity of the prepolymer is reduced, the fluidity of the prepolymer is increased, and the uniformity of the casting polyurethane is further improved; meanwhile, urushiol is used as a chain extender to introduce an unsaturated long side chain into a polyurethane molecular chain, and the long side chain can be polymerized under the action of a photoinitiator, so that an IPN interpenetrating network structure is rapidly formed in a polyurethane matrix, and the vulcanization time of the material is obviously shortened while the mechanical property of the casting polyurethane is improved.
Description
Technical Field
The invention belongs to the technical field of modification of polyurethane elastomers, and particularly relates to a preparation method of modified casting polyurethane.
Background
The Casting Polyurethane (CPU) has good comprehensive performance due to simple and convenient manufacturing process, and is the variety with the largest yield in polyurethane elastomer products. In the aspect of sole preparation, traditional RB soles, TPR soles, TPU soles and the like need to be molded by compression molding or injection molding, so that larger molding pressure (more than 10 MPa) is needed, and the prepared sole product generally has the problems of thick thickness (at least 3.5 mm), heavy weight, high cost and the like. The CPU is formed by chemical reaction, the required mould pressing is small (can be lower than 1 MPa), the cost is low, and the thickness of the sole product can be controlled to be 1mm, so that the application range is wider. At present, the preparation and processing of the CPU are generally carried out by adopting integrated processes and equipment of automatic casting and automatic metering, mixing and forming controlled by an electronic computer, so that the production efficiency is high, the performance and quality of products are more stable, and the prepared polyurethane sole has the unique advantages of high wear resistance, high skid resistance, high toughness, comfort and softness in wearing, good processability and the like, and is an ideal outsole material for high-end leather shoes and sports shoes.
The CPU for shoes mainly adopts a prepolymer method or a semi-prepolymer process, and can be generally prepared into two components or three components, wherein the component A consists of polyalcohol, chain extender and the like; the component B is isocyanate-terminated prepolymer prepared by reacting polyol and isocyanate; the component C is a catalyst and can be mixed in the component A for use. The components of the CPU casting forming process A, B are all liquid, the mixing process is short (usually a few seconds), and the reaction is intense, so that the accurate measurement of the CPU stock solution and the mixing uniformity among the components in the forming process directly influence the quality of the product. However, in order to make the elastomer have good comprehensive properties, the viscosity of the prepolymer tends to be relatively high, the fluidity of the prepolymer is relatively poor, and the synthesis reaction of the CPU is severe and rapid, so that the A, B component cannot be uniformly mixed in an automatic and rapid blending casting molding process, and the quality stability of the product is seriously affected. In addition, the current CPU sole forming process also requires a long curing (including secondary curing) time for the-NCO group reaction to be complete, which consumes energy and increases production cost.
Urushiol is a natural phenolic polymer of catechol derivative with unsaturated long side carbon chain, is a main component of special lacquer tree extract in China, and the effective component is a mixture composed of four structures in formula (1). As one of plant polyphenols, urushiol is a type of green resource that is abundant in reserves and renewable. The urushiol has various reactivity due to the active phenolic hydroxyl groups, three active sites on the phenolic ring and the unsaturated hydrophobic long side chain.
Disclosure of Invention
The invention provides a preparation method of modified casting polyurethane, which aims to solve the problems of high prepolymer viscosity, uneven mixing and long vulcanization time after molding in the traditional CPU for shoes. According to the method, the urushiol which is a natural phenol product is introduced into the CPU, so that the fluidity of a CPU prepolymer is enhanced, the viscosity of the CPU prepolymer is reduced, and the uniformity of the CPU product is improved; meanwhile, an unsaturated long side carbon chain of the UV light curing polymerized urushiol is utilized to form a polyurethane/poly urushiol IPN interpenetrating network structure, so that the CPU vulcanization time is reduced, the mechanical property of the material is improved, and an environment-friendly CPU product for shoes with low manufacturing difficulty, stable quality, storage resistance, quick crosslinking and excellent performance is obtained.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a preparation method of modified casting polyurethane comprises the following steps:
1) Preparing a component A: uniformly stirring the polyalcohol, urushiol, a catalyst and a photoinitiator to obtain a component A, and storing the component A in a constant temperature oven at 70-75 ℃;
2) And (3) preparing a component B: uniformly stirring polyisocyanate and urushiol to obtain a component B, and storing the component B in a 70-75 ℃ incubator;
3) Synthesizing modified casting polyurethane: and (3) uniformly mixing A, B components, injecting the mixture into a mold, curing the mixture by using UV radiation after molding, and then placing and curing the sample to obtain the modified casting polyurethane.
Further, the urushiol, the polyol and the polyisocyanate are all subjected to drying treatment, wherein the water content of the urushiol after treatment is less than 1%.
Further, the B component is used within 8 hours after being formulated.
The mass ratio of the polyalcohol to the polyisocyanate to the urushiol to the catalyst to the photoinitiator is 100:25-50:0.1-10:0.5-3:0.1-0.3, wherein the mass fraction of the urushiol in the component B is not more than 3%.
In the step 1), the polyol is one or more of polyester glycol and polyether glycol.
In step 1), the catalyst is one or more of organic metal compounds, such as stannous octoate, dibutyl tin dilaurate, CAT-680; the photoinitiator is one or more of cleavage type initiators, such as 1173, TPO, 2959.
In the step 2), the polyisocyanate is one or more of aliphatic diisocyanate and aromatic diisocyanate.
In the step 3), the temperature of the die is 60-110 ℃, and the molding time is 1-60 min.
In the step 3), the ultraviolet light wavelength used for the UV radiation curing is 200-400 nm, and the radiation time is 1-20 min.
Further, in the step 3), the curing is performed for 12 to 24 hours in a humidity environment of between 45 and 55 percent at a temperature of between 33 and 37 ℃.
According to the technical scheme, urushiol is introduced into the casting polyurethane, the benzene ring and the long side chain in the urushiol structure are utilized to increase the intermolecular distance of the prepolymer polyol, and the intermolecular interaction force is weakened, so that the viscosity of the prepolymer is reduced, the fluidity of the prepolymer is increased, and the uniformity of the casting polyurethane is further improved. Meanwhile, urushiol serving as a chain extender can introduce an unsaturated long side chain into a CPU molecular chain, and the reaction process is shown as a formula (2).
R1 is aliphatic or aromatic chain segment
Reaction process of urushiol of formula (2) and polyisocyanate
And polymerizing the urushiol modified CPU containing the unsaturated long side chain through UV light curing, so that a polyurethane/poly urushiol IPN interpenetrating network structure is formed, the mechanical property of the modified CPU is improved, the vulcanization time of the material is obviously shortened, the reaction process is shown as a formula (3), and the schematic diagram of the IPN interpenetrating network is shown as a figure 1.
Compared with the common casting polyurethane synthesis method, the method has the characteristics of low manufacturing difficulty, high efficiency, good product uniformity, good durability, excellent performance and the like. The urushiol is taken as one of plant polyphenol, is a main component of a special urushiol extracting solution in China, is taken as a renewable green resource, and has the unique advantages of low cost, abundant resources and the like.
R1 is aliphatic or aromatic chain segment, R2 is polyether or polyester chain segment.
Polymerization process of urushiol of formula (3)
Drawings
FIG. 1 is a schematic diagram of an IPN interpenetrating network formed during the polymerization of urushiol.
FIG. 2 is a graph of CPU stress-strain test.
Detailed Description
The present invention will be described in further detail with reference to examples.
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
The parts in the following examples and comparative examples refer to parts by mass.
And removing water from urushiol until the water content is less than 1%.
The polyester diol and the diisocyanate are all subjected to water removal treatment.
The catalyst is stannous octoate.
The photoinitiator was 1173.
Example 1
(1) Preparing a component A: 100 parts of polyester diol, 1 part of catalyst, 0.35 part of urushiol and 0.013 of photoinitiator are taken, and the mixture is stirred uniformly and then stored in a 75 ℃ incubator.
(2) And (3) preparing a component B: 30 parts of diisocyanate and 0.3 part of urushiol are taken and mixed evenly and then stored in a constant temperature box at 75 ℃.
(3) Adding A, B components into a mixer, uniformly mixing, injecting into a 75 ℃ die for molding for 10min, taking out, and radiating for 1min by a UV curing machine with the wavelength of 250-400 nm to finish the synthesis of the modified casting polyurethane.
Example 2
On the basis of example 1, the prepared modified casting polyurethane was allowed to stand at 35℃in a 50% humidity environment for 12 hours to age, thereby completing the synthesis of the modified casting polyurethane.
Example 3
On the basis of example 1, the prepared modified casting polyurethane was left to stand in an environment of 35℃and 50% humidity for 24 hours for curing, thereby completing the synthesis of the modified casting polyurethane.
Example 4
(1) Preparing a component A: 100 parts of polyester diol, 1 part of catalyst, 2 parts of urushiol and 0.05 part of photoinitiator are taken, and the mixture is stirred uniformly and then stored in a 75 ℃ incubator.
(2) And (3) preparing a component B: 30 parts of diisocyanate and 0.5 part of urushiol are taken and mixed evenly and then stored in a constant temperature box at 75 ℃.
(3) Adding A, B components into a mixer, uniformly mixing, injecting into a 75 ℃ die for molding for 10min, taking out, and radiating for 1min by a UV curing machine with the wavelength of 250-400 nm to prepare the modified casting polyurethane.
(4) And (3) placing the prepared modified casting polyurethane in an environment with the temperature of 35 ℃ and the humidity of 50% for 12 hours for curing, and completing the synthesis of the modified casting polyurethane.
Comparative example 1
(1) Preparing a component A: 100 parts of polyester diol and 1 part of catalyst are mixed, stirred uniformly and then stored in a 75 ℃ incubator.
(2) And (3) preparing a component B: 30 parts by mass of diisocyanate were taken and stored in an incubator at 75 ℃.
(3) Adding A, B components into a mixer, uniformly mixing, injecting into a 75 ℃ die for molding for 10min, and taking out to finish the synthesis of the casting polyurethane.
Comparative example 2
On the basis of comparative example 1, the prepared cast polyurethane was left to stand in an environment of 35℃and 50% humidity for 12 hours to age, thereby completing the synthesis of the cast polyurethane.
Comparative example 3
On the basis of comparative example 1, the prepared cast polyurethane was allowed to stand at 35℃in a 50% humidity environment for 24 hours to age, thereby completing the synthesis of the cast polyurethane.
Comparative example 4
On the basis of comparative example 1, the prepared cast polyurethane was left to stand in an environment of 35℃and 50% humidity for 36 hours to age, thereby completing the synthesis of the cast polyurethane.
The products prepared in examples and comparative examples were subjected to performance test, and the results are shown in Table 1.
TABLE 1CPU Performance test results
Remarks: the viscosity index was measured by placing the A component at 50℃for 1 hour, then adjusting the temperature to 25℃and using a digital viscometer (3 # spindle, 30 rpm).
As can be seen from the viscosity measurement results of the A component in the table, the A component of example 1 contains urushiol, and the viscosity of the system is reduced compared with that of comparative example 1, which indicates that the addition of urushiol can improve the fluidity of the A component, which is advantageous in improving the uniformity of the A, B component in casting.
From the changes in Shore A hardness, tensile strength, elongation at break, right angle tear, DIN abrasion of comparative examples 1 to 4 and examples 1 to 3 in the tables, it is understood that the CPU after demolding is cured for a certain period of time, and the performance of the CPU can meet the use requirements. As is clear from comparative examples 1 to 4, the polyurethane had stable properties after 24 hours of curing, but as is clear from examples 1 to 3, the curing time for the polyurethane to have stable properties can be shortened to 12 hours by the method of the present invention. This result demonstrates that the polyurethane/poly urushiol IPN interpenetrating network structure formed by UV light curing is beneficial for reducing the curing time of the CPU. Meanwhile, by comparing the performance indexes of the cured CPU, the comprehensive performance of the modified CPU containing the polyurethane/poly urushiol IPN interpenetrating network structure is better than that of the common CPU.
Fig. 2 shows stress-strain curves of the products of comparative example 3, example 3 and example 4, from which it can be seen that the use of urushiol and photoinitiator to modify the CPU helps to further increase the overall performance of the modified CPU. As can be seen by comparing the tensile strengths of the different CPUs at 500% strain, the rigidity of the product of example 4 is highest, and the product of example 3 is next to the product of example 3, and the product of example 3 is smallest, which shows that the polyurethane/urushiol IPN interpenetrating network structure effectively enhances the rigidity of the CPU.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (10)
1. The preparation method of the modified casting polyurethane is characterized by comprising the following steps of:
1) Preparing a component A: uniformly stirring the polyalcohol, urushiol, a catalyst and a photoinitiator to obtain a component A, and storing the component A in a constant temperature oven at 70-75 ℃;
2) And (3) preparing a component B: uniformly stirring polyisocyanate and urushiol to obtain a component B, and storing the component B in a 70-75 ℃ incubator;
3) Synthesizing modified casting polyurethane: and (3) uniformly mixing A, B components, injecting the mixture into a mold, curing the mixture by using UV radiation after molding, and then placing and curing the product to obtain the modified casting polyurethane.
2. The method for preparing modified casting polyurethane according to claim 1, wherein the urushiol water content is less than 1%.
3. The preparation method of the modified casting polyurethane according to claim 1, wherein the mass ratio of the polyol to the polyisocyanate to the urushiol to the catalyst to the photoinitiator is 100:25-50:0.1-10:0.5-3:0-0.3.
4. A process for preparing a modified cast polyurethane as claimed in claim 3, wherein the mass fraction of urushiol in the B component is not more than 3%.
5. The method for producing a modified casting polyurethane according to claim 1, wherein the component B is used within 8 hours after the preparation.
6. The method for preparing modified casting polyurethane according to claim 1, wherein in the step 1), the polyol is one or more of polyester diol and polyether diol; the catalyst is one or more of organic metal compounds; the photoinitiator is one or more of cleavage type initiators.
7. The method for producing a modified casting polyurethane according to claim 1, wherein in the step 2), the polyisocyanate is one or more of aliphatic diisocyanate and aromatic diisocyanate.
8. The method for preparing modified casting polyurethane according to claim 1, wherein in the step 3), the temperature of the mold is 60-110 ℃, and the molding time is 1-60 min.
9. The method for preparing modified casting polyurethane according to claim 1, wherein in the step 3), the ultraviolet light used for the UV radiation curing has a wavelength of 200-400 nm and a radiation time of 1-20 min.
10. The method for producing a modified casting polyurethane according to claim 1, wherein in the step 3), the curing is performed for 12 to 24 hours at 33 to 37 ℃ in a humidity environment of 45 to 55%.
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