Wear-resistant polyurethane polishing jig and preparation method thereof

Abstract

The invention discloses a wear-resistant polyurethane polishing jig and a preparation method thereof, and relates to the technical field of polishing jig preparation. The wear-resistant polyurethane polishing jig is prepared by mixing and pouring a benzene-containing polyurethane prepolymer, a vulcanization chain extender and color paste, and the benzene-containing polyurethane prepolymer is prepared by reacting polyhydric alcohols with phenyl polyisocyanates. The benzene-containing polyurethane prepolymer is prepared by matching phenyl polyisocyanate with polyol, so that the overall rigidity of a polyurethane molecular chain can be enhanced, the overall flexibility of the molecular chain is not greatly influenced, the relationship between the hardness and the flexibility of the polishing jig is favorably balanced, and the service life of the polishing jig is prolonged. Therefore, the polishing jig with high hardness, high mechanical modulus, high wear resistance and high flexibility can be prepared.

Description

Technical Field

[0001] The present invention relates to the technical field of polishing fixture preparation, and in particular to a wear-resistant polyurethane polishing fixture and a preparation method thereof. Background Art

[0002] With the rapid development of science and technology, the demand for materials such as optical crystals, precision integrated circuit chips, optical glass, and display screens of mobile phones and tablets is increasing day by day. Most of these materials need to go through a variety of grinding and polishing processes to meet the practical requirements. In the grinding and polishing process, polishing fixtures are often used to fix and protect the substrates to be polished and need to be ground and polished together with the substrates. Therefore, polishing fixtures made of polyurethane have become the core tools in the field of precision polishing due to their high wear resistance, soft elasticity, and chemical corrosion resistance.

[0003] However, due to the problem of polyurethane raw material formulation, the existing polishing fixtures are prone to problems such as embrittlement, uneven hardness, or insufficient flexibility. For example, when adding a large amount of fillers to make the polyurethane material have high hardness and wear resistance, the structure of the cast polishing fixture is brittle at this time and is prone to fracture and damage during complex mirror polishing. Or when reducing the amount of fillers to improve the flexibility of polyurethane, the elastic polyurethane material is not only difficult to clamp and fix the polishing material, directly affecting the polishing effect, but also causes the polishing fixture to be excessively worn during the polishing process, greatly reducing the service life. Therefore, further balancing the hardness and flexibility of the polishing fixture, while improving the wear resistance of the polyurethane polishing fixture and extending its service life has certain market value significance. Summary of the Invention

[0004] In order to balance the hardness and flexibility of the polishing fixture, while improving the wear resistance of the polishing fixture and extending the service life of the polishing fixture, the present application provides a wear-resistant polyurethane polishing fixture and a preparation method thereof.

[0005] In the first aspect, a wear-resistant polyurethane polishing fixture provided by the present application adopts the following technical solution: A wear-resistant polyurethane polishing fixture is prepared by melt-mixing and casting the following raw materials in parts by weight: Phenyl-containing polyurethane prepolymer: 100 parts; Sulfide chain extender: 10.5 - 12 parts; Color paste: 1 - 1.5 parts; Wherein, the phenyl-containing polyurethane prepolymer is prepared by reacting a polyol with a phenyl polyisocyanate.

[0006] By adopting the above technical solution, using phenyl polyisocyanate as the hard segment of the polyurethane prepolymer molecular chain can introduce a phenyl group with steric hindrance effect into the hard segment of the polyurethane prepolymer molecular chain, which can greatly enhance the overall rigidity of the molecular chain and is beneficial to improving the hardness, mechanical modulus and wear resistance of the obtained polishing fixture. Moreover, compared with directly adding reinforcing fillers to improve the wear resistance of the polishing fixture, modifying the polyurethane material from the molecular chain of the polyurethane prepolymer has little impact on the overall flexibility of the molecular chain, which is beneficial to balancing the relationship between the hardness and flexibility of the polishing fixture, so that the polishing fixture can still retain high flexibility when it has high hardness and high mechanical modulus, and its comprehensive performance is better.

[0007] Optionally, the polyol includes polycaprolactone polyol, the phenyl polyisocyanate is isocyanate group-terminated phenyl POSS, and the molar ratio of the hydroxyl group of the polyol to the isocyanate group of the isocyanate group-terminated phenyl POSS is 1:(1.2 - 1.3); Among them, the isocyanate group-terminated phenyl POSS is prepared by catalytic reaction of silanol phenyl POSS and hexamethylene diisocyanate, and the silanol phenyl POSS is one of trisilanol phenyl POSS, tetrasilanol phenyl POSS or trisilanol heptaphenyl POSS.

[0008] By adopting the above technical solution, using isocyanate group-terminated phenyl POSS as the isocyanate group to react with polycaprolactone polyol to form a benzene-containing polyurethane prepolymer can introduce a high steric hindrance phenyl POSS group into the hard segment of the polyurethane prepolymer molecular chain. Furthermore, it can not only greatly enhance the overall rigidity of the molecular chain, but also make the connection between molecular chains closer, with large intermolecular forces, which is beneficial to further improving the hardness and mechanical modulus of the subsequent obtained polishing fixture. At the same time, since the phenyl POSS group is uniformly dispersed in the molecular chain in the form of nano microdomains, it will not significantly change the overall flexibility of the molecular chain, so it has little impact on the flexibility of the material, which is beneficial to enabling the polishing fixture to still retain high flexibility when it has high hardness and high mechanical modulus.

[0009] Optionally, the preparation method of the isocyanate group-terminated phenyl POSS includes the following steps: Take silanol phenyl POSS and dissolve it in tetrahydrofuran, heat it to 45 - 60 °C, then add the first catalyst, stir and mix, and then slowly dropwise add hexamethylene diisocyanate, and slowly stir at a stirring speed of 80 - 100 r / min, keep the temperature and continue to react for 10 - 12 h. After the reaction reaches near the theoretical value of the isocyanate value, carry out vacuum distillation and vacuum drying to obtain isocyanate group-terminated phenyl POSS.

[0010] Optionally, the molar ratio of the silanol phenyl POSS to the hexamethylene diisocyanate is 1:(1.8 - 2.4).

[0011] By adopting the above technical solutions, it can not only ensure that the silanol groups in the silanol phenyl POSS fully react to form urethane bonds and form prepolymer molecular chains, but also effectively prevent the problems of side reactions and low stability caused by excessive isocyanate groups in the system. At the same time, it can also control the content of isocyanate groups in the isocyanate group-terminated phenyl POSS prepared, prevent the excessive reactivity of the benzene-containing polyurethane prepolymer, so as to control the vulcanization crosslinking speed thereof subsequently, which is beneficial to preventing the uneven performance or defects of the polishing tool.

[0012] Optionally, the polyol further includes a vegetable oil-based polyol, and the hydroxyl molar ratio of the polycaprolactone polyol to the vegetable oil-based polyol is (1-4):1.

[0013] By adopting the above technical solutions, introducing a vegetable oil-based polyol containing long-chain fatty groups can effectively improve the flexibility of the soft segment of the molecular chain, increase the dispersion degree of the hard segment of the molecular chain at the same time, and reduce the overall crystallinity, which is beneficial to improving the problem of the decreased flexibility of the polishing tool caused by the introduction of the high steric hindrance isocyanate group-terminated phenyl POSS.

[0014] Optionally, the vegetable oil-based polyol includes at least one of a cashew shell oil-based polyol or a castor oil-based polyol.

[0015] By adopting the above technical solutions, adding a small amount of cashew shell oil-based polyol can not only slightly improve the flexibility of the polishing tool, but also slightly improve its hardness and tensile strength; while adding a small amount of castor oil-based polyol can significantly improve the flexibility of the polishing tool, and the decrease in its hardness and tensile strength is not large, and relatively good mechanical properties can still be retained.

[0016] Optionally, the preparation method of the benzene-containing polyurethane prepolymer includes the following steps: Take the isocyanate group-terminated phenyl POSS and dissolve it in N,N-dimethylformamide, add the polyol and stir well to mix, after adding the second catalyst, heat up to 80-95 °C and continuously stir and react for 2-3 h. After the reaction reaches near the target theoretical value of the isocyanate value, carry out vacuum distillation and vacuum drying to obtain the benzene-containing polyurethane prepolymer.

[0017] Optionally, the benzene-containing polyurethane prepolymer is one of IMUTHANE 42-60A, IMUTHANE 22-83A, IMUTHANE32-95A, IMUTHANE 12-95A.

[0018] By adopting the above technical solutions, using the existing commercially available benzene-containing polyurethane prepolymer can not only prepare a polishing tool with both high hardness and good flexibility, but also has more channels for obtaining raw materials and is simple and convenient to obtain.

[0019] Optionally, the vulcanization chain extender is selected from one of 4,4'-methylenebis(2-chloroaniline) or 3-chloro-3'-ethyl-4,4'-diaminodiphenylmethane.

[0020] In a second aspect, the present application provides a method for preparing a wear-resistant polyurethane polishing jig using the following technical solution: A method for preparing a wear-resistant polyurethane polishing jig, comprising the following steps: The benzene-containing polyurethane prepolymer is heated to 50-85°C, melted and continuously dried for 6-8 hours, and then a vulcanization chain extender and a color paste are added while hot, heated to 80-90°C and stirred for 8-15 minutes, and finally poured into a mold for vulcanization molding. After the vulcanization is completed, the mold is cooled and opened to obtain a wear-resistant polyurethane polishing fixture.

[0021] By adopting the above technical solution, pre-baking for a long time can fully remove the moisture in the raw materials, effectively prevent the generation of bubbles and pores in the subsequent vulcanization molding process, and help ensure the mechanical properties and appearance of the polyurethane polishing fixture. In addition, heating and high-temperature stirring and mixing before pouring are beneficial to improving the fluidity of the benzene-containing polyurethane prepolymer, and at the same time, it is beneficial to evenly disperse the vulcanization chain extender and color paste, reduce local stress concentration points, and improve the vulcanization effect of the benzene-containing polyurethane prepolymer.

[0022] Optionally, the vulcanization molding is a two-stage vulcanization process, wherein the first stage of vulcanization needs to be maintained at 85-105° C. and kept warm for 10-15 minutes, and the second stage of vulcanization needs to be cooled to 65-80° C. and kept warm for 6-8 hours.

[0023] By adopting the above technical scheme, the first stage of high-temperature vulcanization can enable the benzene-containing polyurethane prepolymer to form a preliminary cross-linked network under the action of the vulcanization chain extender, and the second stage of long-term low-temperature vulcanization can enable the remaining isocyanate groups to fully react, further improving the cross-linked network and microphase separation structure. Compared with the single-stage high-temperature vulcanization process, it can effectively prevent excessive cross-linking, reduce internal stress, and is beneficial to improving the comprehensive performance of the polyurethane polishing fixture.

[0024] In summary, the technical solution of this application has at least one of the following beneficial effects: 1. The benzene-containing polyurethane prepolymer is prepared by using phenyl polyisocyanate in combination with polyol, which is beneficial to balance the relationship between the hardness and flexibility of the polishing fixture, and thus can produce a polishing fixture with high hardness, high mechanical modulus, high wear resistance and high flexibility.

[0025] 2. By introducing vegetable oil-based polyols containing long-chain fatty groups, the problem of decreased flexibility of the polyurethane molecular chain caused by the introduction of high-steric hindrance isocyanate-terminated phenyl POSS can be effectively improved, which is beneficial to improving the flexibility of the polishing fixture. DETAILED DESCRIPTION

[0026] The present application is further described in detail below in combination with preparation examples, embodiments and comparative examples.

[0027] Trisilanol phenyl POSS, tetrasilanol phenyl POSS and trisilanol heptaphenyl POSS were all purchased from Xi'an Qiyue Biological, and the specific brands are Q-0000419, Q-0000420, and Q-0332070 respectively.

[0028] The polycaprolactone polyol was purchased from polycaprolactone diol from Pasto, France, with a specific brand name of CAPA 2200.

[0029] The cashew nut shell liquid based polyol was purchased from Cardolite's cashew nut shell liquid diol, with a specific brand number of NX-9201.

[0030] The castor oil-based polyol was purchased from modified castor oil diol from Vantellus, with a specific brand number of D-2000.

[0031] Preparation Example [Preparation Example 1-1] An isocyanate-terminated phenyl POSS is prepared by the following preparation method: Take trisilanol phenyl POSS and dilute it in tetrahydrofuran at 30wt%, heat it to 50°C, then add the first catalyst, stir for 30s, then slowly add hexamethylene diisocyanate at a rate of 2ml / min, and stir at a rate of 95r / min. Keep the temperature and react for 10h. After the isocyanate value reaches near the theoretical value, distill under reduced pressure and dry in vacuum to obtain isocyanate-terminated phenyl POSS.

[0032] In this preparation example, the molar ratio of trisilanol phenyl POSS to hexamethylene diisocyanate is 1:1.8; the first catalyst is dibutyltin dilaurate, and the added amount of the first catalyst is 0.05% of the added amount of trisilanol phenyl POSS.

[0033] [Preparation Example 1-2] An isocyanate-terminated phenyl POSS is prepared by the following preparation method: Take tetrasilyl phenyl POSS and dilute it in tetrahydrofuran at 35wt%, heat it to 45°C, then add the first catalyst, stir for 30s, then slowly add hexamethylene diisocyanate at a rate of 2ml / min, and stir at a rate of 100r / min. Keep the temperature and react for 10h. After the isocyanate value reaches near the theoretical value, distill under reduced pressure and dry in vacuum to obtain isocyanate-terminated phenyl POSS.

[0034] In this preparation example, the molar ratio of tetrasilanol phenyl POSS to hexamethylene diisocyanate is 1:2.4; the first catalyst is dibutyltin dilaurate, and the addition amount of the first catalyst is 0.05% of the addition amount of trisilanol phenyl POSS.

[0035]

Preparation Example 1-3

[0036] In this preparation example, the molar ratio of trisilanol heptaphenyl POSS to hexamethylene diisocyanate is 1:2; the first catalyst is dibutyltin dilaurate, and the addition amount of the first catalyst is 0.08% of the addition amount of trisilanol phenyl POSS.

[0037]

Preparation Example 2-1

[0038] In this preparation example, the polyol is polycaprolactone polyol, and the isocyanate group-terminated phenyl POSS is an isocyanate group-terminated phenyl POSS prepared in

Preparation Example 1-1

[0039]

Preparation Example 2-2

[0040] In this preparation example, the polyol is polycaprolactone polyol, and the isocyanate group-terminated phenyl POSS is one of the isocyanate group-terminated phenyl POSS prepared in

Preparation Example 1-2

[0041]

Preparation Example 2-3

[0042] In this preparation example, the polyol is polycaprolactone polyol, and the isocyanate group-terminated phenyl POSS is one of the isocyanate group-terminated phenyl POSS prepared in

Preparation Example 1-3

[0043]

Preparation Example 2-4

Preparation Example 2-1

[0044] In this preparation example, the polyol is a mixture of polycaprolactone polyol and vegetable oil-based polyol. Among them, the vegetable oil-based polyol is cashew shell oil-based polyol, and the molar ratio of the hydroxyl group of polycaprolactone polyol to cashew shell oil-based polyol is 4:1.

[0045]

Preparation Example 2-5

Preparation Example 2-4

[0046] In this preparation example, the polyol is a mixture of polycaprolactone polyol and vegetable oil-based polyol. Among them, the vegetable oil-based polyol is castor oil-based polyol, and the molar ratio of the hydroxyl group of polycaprolactone polyol to castor oil-based polyol is 4:1.

[0047]

Preparation Example 2-6

Preparation Example 2-4

[0048] In this preparation example, the polyol is a mixture of polycaprolactone polyol and vegetable oil-based polyol, wherein the vegetable oil-based polyol is castor oil-based polyol, and the hydroxyl molar ratio of polycaprolactone polyol to castor oil-based polyol is 1:1.

[0049] [Preparation Example 2-7] A polyurethane prepolymer, which differs from [Preparation Example 2-3] in that no isocyanate-terminated phenyl POSS is added.

[0050] In this preparation example, an equal amount of hexamethylene diisocyanate with the same molar amount of isocyanate groups was used to replace the isocyanate-terminated phenyl POSS. Example

[0051] [Example 1] A wear-resistant polyurethane polishing tool comprises the following raw materials: 100 kg of benzene-containing polyurethane prepolymer, 10.5 kg of vulcanization chain extender and 1 kg of color paste.

[0052] In this embodiment, the benzene-containing polyurethane prepolymer is specifically selected from the benzene-containing polyurethane prepolymer with the brand number IMUTHANE 42-60A, and the vulcanization chain extender is selected from 4,4'-methylenebis(2-chloroaniline).

[0053] A method for preparing a wear-resistant polyurethane polishing jig comprises the following steps: The benzene-containing polyurethane prepolymer is heated to 80°C and dried for 6 hours. Then, the vulcanization chain extender and color paste are added while hot, heated to 85°C and stirred for 10 minutes, and finally poured into the mold for two-stage vulcanization molding. The first stage of vulcanization needs to be maintained at 100°C and kept warm for 15 minutes, and the second stage of vulcanization needs to be cooled to 80°C and kept warm for 6 hours. After the vulcanization is completed, the mold is cooled and opened to obtain a wear-resistant polyurethane polishing fixture.

[0054] [Example 2] A wear-resistant polyurethane polishing tool comprises the following raw materials: 100 kg of benzene-containing polyurethane prepolymer, 11 kg of vulcanization chain extender and 1.5 kg of color paste.

[0055] In this embodiment, the benzene-containing polyurethane prepolymer is specifically selected from the benzene-containing polyurethane prepolymer with the brand name IMUTHANE 32-95A, and the vulcanization chain extender is selected from 3-chloro-3'-ethyl-4,4'-diaminodiphenylmethane.

[0056] A method for preparing a wear-resistant polyurethane polishing jig comprises the following steps: Heat the benzene-containing polyurethane prepolymer to 50 °C and continuously dry it for 8 h. Then, while it is still hot, add the vulcanization chain extender and color paste, heat to 80 °C and stir for 8 min. Finally, pour it into a mold for two-stage vulcanization molding. For the first-stage vulcanization, maintain at 85 °C and keep the reaction for 20 min. For the second-stage vulcanization, cool down to 65 °C and keep the reaction for 8 h. After vulcanization, cool and open the mold to obtain a wear-resistant polyurethane polishing jig.

[0057]

Example 3

[0058] In this example, the benzene-containing polyurethane prepolymer is specifically selected as a benzene-containing polyurethane prepolymer prepared in

Preparation Example 2-1

[0059] A preparation method of a wear-resistant polyurethane polishing jig, comprising the following steps: Heat the benzene-containing polyurethane prepolymer to 80 °C and continuously dry it for 6 h. Then, while it is still hot, add the vulcanization chain extender and color paste, heat to 90 °C and stir for 10 min. Finally, pour it into a mold for two-stage vulcanization molding. For the first-stage vulcanization, maintain at 105 °C and keep the reaction for 20 min. For the second-stage vulcanization, cool down to 80 °C and keep the reaction for 8 h. After vulcanization, cool and open the mold to obtain a wear-resistant polyurethane polishing jig.

[0060]

Example 4

Example 3

[0061] In this example, the benzene-containing polyurethane prepolymer is specifically selected as a benzene-containing polyurethane prepolymer prepared in

Preparation Example 2-2

[0062]

Example 5

Example 3

[0063] In this example, the benzene-containing polyurethane prepolymer is specifically selected as a benzene-containing polyurethane prepolymer prepared in

Preparation Example 2-3

[0064]

Example 6

Example 3

[0065] In this example, the benzene-containing polyurethane prepolymer is specifically selected as a benzene-containing polyurethane prepolymer prepared in

Preparation Example 2-4

[0066]

Example 7

Example 3

[0067] In this example, the benzene-containing polyurethane prepolymer is specifically selected as a benzene-containing polyurethane prepolymer prepared in

Preparation Example 2-5

[0068]

Example 8

Example 3

[0069] In this example, the benzene-containing polyurethane prepolymer is specifically selected as a benzene-containing polyurethane prepolymer prepared in

Preparation Example 2-6

[0070] Comparative Example

Comparative Example 1

Example 1

[0071] In this comparative example, a polyurethane prepolymer prepared in

Preparation Example 2-7

[0072]

Comparative Example 2

Comparative Example 1

[0073] In this comparative example, 20 kg of silica powder and 5 kg of chopped glass fiber are additionally added.

[0074] Performance test data 1. Hardness test: It is measured according to "GB / T 531.1-2009 Rubber, vulcanized or thermoplastic - Determination of indentation hardness - Part 1: Durometer method (Shore hardness)", in which a Shore A durometer or a Shore D durometer is used for measurement, and the Shore hardness values (HA / HD) measured for each example and comparative example are recorded. To ensure accuracy, if the Shore A hardness (HA) measured with a Shore A durometer is greater than 90, the Shore D durometer is used for re-measurement, and the Shore D hardness (HD) is recorded.

[0075] 2. Mechanical strength test: It is measured according to "GB / T 528-2009 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties", in which a Type 1 specimen is used for measurement, and the tensile strength (MPa) and elongation at break (%) measured for each example and comparative example are recorded.

[0076] 3. Abrasion resistance test: The test was carried out according to "GB / T 1689-1998 Determination of abrasion resistance of vulcanized rubber (using Akron abrasion tester)", and the abrasion volume (mm 3 ) of each example and comparative example within the same time was recorded.

[0077] Table 1 Performance test data of polyurethane polishing fixtures Shore hardness Tensile strength (MPa) Elongation at break (%) <![CDATA[Wear volume (mm 3 )]]> Example 1 64HA 15.3 493 23 Example 2 86HA 19.3 451 18 Example 3 57HD 26.4 453 9 Example 4 55HD 24.1 467 11 Example 5 60HD 30.5 388 9 Example 6 57HD 27.8 472 9 Example 7 54HD 24.2 512 13 Example 8 90HA 20.7 533 15 Comparative Example 1 18HA 7.6 1262 138 Comparative Example 2 82HA 25.5 153 32 Combining Examples 1-3 and Comparative Examples 1-2 and the data in Table 1, it can be seen that by using phenyl polyisocyanate as the hard segment of the polyurethane prepolymer molecular chain and modifying the polyurethane material from the molecular chain of the polyurethane prepolymer, the prepared polyurethane polishing fixture not only has high hardness and wear resistance, but also, compared with the direct blending and reinforcing filler modification method, can effectively improve the structural strength of the polishing fixture while retaining considerable flexibility, so that the polishing fixture is not easily damaged due to insufficient strength during the polishing process, which is beneficial to extending the service life of the polishing fixture.

[0078] Combining Example 1 and Examples 3-5 and the data in Table 1, it can be seen that by using isocyanate group-terminated phenyl POSS to react with polycaprolactone polyol to form a benzene-containing polyurethane prepolymer, compared with the commercially available benzene-containing polyurethane prepolymer synthesized from TDI, the prepared polishing fixture has significantly improved hardness, mechanical strength and wear resistance. Although it will also cause a decrease in its flexibility, the performance degradation is not significant and is within an acceptable range.

[0079] In addition, when silanol phenyl POSS with different groups and structures is selected to synthesize isocyanate group-terminated phenyl POSS, the performance of the finally formed polyurethane polishing fixture is significantly different. This may be because the network structures formed by different isocyanate group-terminated phenyl POSS through cross-linking reactions are different, which in turn leads to differences in their performance. Taking Examples 3 and 4 as an example, although the isocyanate group-terminated phenyl POSS selected in Examples 3 and 4 differs by one isocyanate group in structure, since the silanol groups of trisilanol phenyl POSS are concentrated on the same plane of POSS, while the silanol groups of tetrasilanol phenyl POSS are distributed diagonally on POSS, the network structure formed by the benzene-containing polyurethane prepolymer in Example 3 after vulcanization cross-linking is more compact, with a higher cross-linking density, and exhibits higher tensile strength and hardness, as well as lower flexibility.

[0080] Combining Example 3 with Examples 6-8 and combining with the data in Table 1, it can be seen that by introducing vegetable oil-based polyols, the problem of decreased flexibility caused by the introduction of high steric hindrance isocyanate group-terminated phenyl POSS can be effectively improved, which is beneficial to further balance the hardness and flexibility of the polishing tool. This may be because the introduced vegetable oil-based polyols all have long-chain aliphatic groups, which can improve the flexibility of the soft segment of the molecular chain, increase the dispersion degree of the hard segment of the molecular chain, reduce the overall crystallinity, and thus improve the flexibility of the polishing tool.

[0081] This specific implementation manner is only an interpretation of the present application, and it is not a limitation to the present application. After reading this specification, those skilled in the art can make modifications without creative contributions to this specific implementation manner as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A wear-resistant polyurethane polishing jig, characterized in that: The product is prepared by melting, mixing and pouring the following raw materials in parts by weight: Benzene-containing polyurethane prepolymer: 100 parts; Vulcanization chain extender: 10.5-12 parts; Color paste: 1-1.5 parts; The benzene-containing polyurethane prepolymer is prepared by reacting polyol with phenyl polyisocyanate.

2. A wear-resistant polyurethane polishing tool according to claim 1, characterized in that: The polyol comprises polycaprolactone polyol, the phenyl polyisocyanate is isocyanate-terminated phenyl POSS, and the molar ratio of the hydroxyl group of the polyol to the isocyanate group of the isocyanate-terminated phenyl POSS is 1:(1.2-1.3); The isocyanate-terminated phenyl POSS is prepared by catalytic reaction of silanol phenyl POSS and hexamethylene diisocyanate, and the silanol phenyl POSS is one of trisilanol phenyl POSS, tetrasilanol phenyl POSS or trisilanol heptaphenyl POSS.

3. A wear-resistant polyurethane polishing tool according to claim 2, characterized in that: The preparation method of the isocyanate-terminated phenyl POSS comprises the following steps: Take silanol phenyl POSS and dissolve it in tetrahydrofuran, heat it to 45-60°C, then add the first catalyst, stir and mix, then slowly add hexamethylene diisocyanate, and slowly stir at a stirring speed of 80-100r / min, keep the temperature and continue to react for 10-12h, react until the isocyanate value reaches near the theoretical value, distill under reduced pressure and dry in vacuum to obtain isocyanate-terminated phenyl POSS.

4. A wear-resistant polyurethane polishing tool according to claim 3, characterized in that: The molar ratio of the silanol phenyl POSS to the hexamethylene diisocyanate is 1:(1.8-2.4).

5. The wear-resistant polyurethane polishing tool according to claim 2, characterized in that: The polyol also includes a plant oil-based polyol, and the hydroxyl molar ratio of the polycaprolactone polyol to the plant oil-based polyol is (1-4):

1.

6. The wear-resistant polyurethane polishing tool according to claim 2, characterized in that: The vegetable oil-based polyol includes at least one of cashew nut shell oil-based polyol and castor oil-based polyol.

7. The wear-resistant polyurethane polishing tool according to claim 2, characterized in that: The preparation method of the benzene-containing polyurethane prepolymer comprises the following steps: Take isocyanate-terminated phenyl POSS and dissolve it in N,N-dimethylformamide, add polyol and stir well to mix, after adding the second catalyst, heat to 80-95°C and continue stirring to react for 2-3h, react until the isocyanate value reaches near the target theoretical value, distill under reduced pressure and dry in vacuum to obtain a benzene-containing polyurethane prepolymer.

8. The wear-resistant polyurethane polishing tool according to claim 1, characterized in that: The benzene-containing polyurethane prepolymer is one of IMUTHANE 42-60A, IMUTHANE 22-83A, IMUTHANE 32-95A and IMUTHANE 12-95A.

9. A method for preparing a wear-resistant polyurethane polishing jig, used for preparing a wear-resistant polyurethane polishing jig according to any one of claims 1 to 8, characterized in that: The following steps are involved: The benzene-containing polyurethane prepolymer is heated to 50-85°C, melted and continuously dried for 6-8 hours, and then a vulcanization chain extender and a color paste are added while hot, heated to 80-90°C and stirred for 8-15 minutes, and finally poured into a mold for vulcanization molding. After the vulcanization is completed, the mold is cooled and opened to obtain a wear-resistant polyurethane polishing fixture.

10. The method for preparing a wear-resistant polyurethane polishing tool according to claim 1, characterized in that: The vulcanization molding is a two-stage vulcanization process, wherein the first stage vulcanization needs to be maintained at 85-105° C. and kept warm for 10-15 minutes, and the second stage vulcanization needs to be cooled to 65-80° C. and kept warm for 6-8 hours.