High temperature resistant and wear resistant polyurethane elastomer and preparation method thereof

Abstract

The present application relates to the technical field of high polymer material, and especially relates to a kind of high-temperature-resistant and wear-resistant polyurethane elastomer and a preparation method thereof.The high-temperature-resistant and wear-resistant polyurethane elastomer is prepared from raw materials including the following components by weight;polyol 40-60 parts;isocyanate 20-30 parts;F series polyaspartic ester resin 1-20 parts;chain extender 1-20 parts;light stabilizer 0.5-2 parts;antioxidant 0.5-2 parts;ultraviolet absorber 0.5-2 parts;and catalyst 0.01-0.5 parts.The present application reacts F series polyaspartic ester resin with isocyanate containing NCO after mixing with hydroxyl-containing polymer to form polyurethane elastomer, which can effectively improve the wear resistance and high-temperature resistance of the material.The F series polyaspartic ester resin can work well with other components at a specific ratio, further improving the wear resistance and high-temperature resistance of the polyurethane elastomer.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a high-temperature resistant and wear-resistant polyurethane elastomer and its preparation method. Background Technology

[0002] The physical and chemical properties of polyurethane depend on the type and proportion of raw materials used in its synthesis. Generally, the types of raw materials, such as the number of functional groups, molecular structure, and molecular weight of each reactant molecule, determine the final properties of the polyurethane material and how it will be formed. Although polyurethane has excellent performance, it still reveals many shortcomings under extreme and special operating conditions, such as poor high-temperature resistance, abrasion resistance, and weather resistance.

[0003] Currently, the main approach to improving polyurethane's wear resistance and mechanical strength is through molecular modification design, using chemical crosslinking to increase the number of intermolecular bonding points and improve the crosslinking density, forming a more stable network structure. Alternatively, adding inorganic fillers (such as carbon black, silica, and molybdenum disulfide) to polyurethane can significantly improve its hardness, wear resistance, and thermal stability. However, chemical crosslinking and filler methods can affect the material's mechanical properties, reducing mechanical properties such as elongation at break, and the material may not maintain high mechanical strength at high temperatures. Summary of the Invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide a high-temperature resistant and wear-resistant polyurethane elastomer and its preparation method. The high-temperature resistant and wear-resistant polyurethane elastomer provided by the present invention has superior high-temperature resistance and wear resistance.

[0005] This invention provides a high-temperature resistant and wear-resistant polyurethane elastomer, which is prepared from raw materials comprising the following components in parts by weight;

[0006]

[0007]

[0008] Preferably, the F-series polyaspartic acid ester resin includes at least one of F420, F520 and F524.

[0009] Preferably, the polyol includes polyether polyol or polyester polyol;

[0010] The weight-average molecular weight of the polyol is 500 to 3000.

[0011] Preferably, the isocyanate includes at least one selected from toluene diisocyanate, diphenylmethane diisocyanate, dimethylbiphenyl diisocyanate, naphthalene-1,5 diisocyanate, terephthalic diisocyanate, toluene diisocyanate, and hexamethylene diisocyanate trimer.

[0012] Preferably, the chain extender includes at least one selected from 1,4-butanediol, 1,6-hexanediol, and 3,3'-dichloro-4,4'-diaminodiphenylmethane.

[0013] Preferably, the light stabilizer comprises triphenyl phosphite;

[0014] The antioxidant includes antioxidant 1135;

[0015] The ultraviolet absorber includes UV-531;

[0016] The catalyst comprises dibutyltin dilaurate and / or stannous zincate.

[0017] This invention also provides a method for preparing the high-temperature resistant and wear-resistant polyurethane elastomer described above, comprising the following steps:

[0018] A) Under protective gas conditions, polyol, F-series polyaspartic acid ester resin and isocyanate were stirred and reacted to obtain a prepolymer;

[0019] B) The prepolymer, chain extender, light stabilizer, antioxidant, UV absorber and catalyst are stirred and mixed, vulcanized and molded, and then cured to obtain a high-temperature resistant and wear-resistant polyurethane elastomer.

[0020] Preferably, in step A), the protective gas is nitrogen;

[0021] The stirring reaction is carried out at a temperature of 75–85°C for 2–3 hours.

[0022] Preferably, in step B), the vulcanization molding temperature is 115–125°C and the time is 1–2 hours.

[0023] Preferably, in step B), the ripening temperature is 100–120°C and the time is 22–26 h.

[0024] This invention provides a high-temperature and wear-resistant polyurethane elastomer, prepared from raw materials comprising the following components by weight: 40-60 parts polyol; 20-30 parts isocyanate; 1-20 parts F-series polyaspartic ester resin; 1-20 parts chain extender; 0.5-2 parts light stabilizer; 0.5-2 parts antioxidant; 0.5-2 parts ultraviolet absorber; and 0.01-0.5 parts catalyst. This invention involves mixing the F-series polyaspartic ester resin with a hydroxyl-containing polymer, followed by reaction with an isocyanate containing -NCO to generate a polyurethane elastomer, which effectively improves the wear resistance and high-temperature resistance of the material. The F-series polyaspartic ester resin can synergize well with other components in specific proportions, further enhancing the wear resistance and high-temperature resistance of the polyurethane elastomer. Detailed Implementation

[0025] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] This invention provides a high-temperature resistant and wear-resistant polyurethane elastomer, which is prepared from raw materials comprising the following components in parts by weight;

[0027]

[0028] In some embodiments of the present invention, the polyol is a polyether polyol or a polyester polyol. The polyether polyol may be polytetrahydrofuran diol. The weight-average molecular weight of the polyol is 500 to 3000; for example, 650. The weight parts of the polyol are 40 to 45 parts, for example, 42.1 parts.

[0029] In some embodiments of the present invention, the isocyanate is at least one selected from toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), dimethylbiphenyl diisocyanate (TODI), naphthalene-1,5-diisocyanate (NDI), terephthalic diisocyanate (PPDI), toluene diisocyanate (TDI), and hexamethylene diisocyanate trimer. The isocyanate is present in parts by weight of 25 to 30, for example, 26.3 parts.

[0030] In some embodiments of the present invention, the F-series polyaspartic ester resin is selected from at least one of F420, F520, and F524. The F-series polyaspartic ester resin is present in parts by weight of 8 to 15, for example, 10.5 parts.

[0031] In some embodiments of the present invention, the chain extender is at least one selected from 1,4-butanediol (BDO), 1,6-hexanediol (HDO), and 3,3'-dichloro-4,4'-diaminodiphenylmethane (MOCA). The chain extender is present in 15 to 20 parts by weight, for example, 18 parts.

[0032] In some embodiments of the present invention, the light stabilizer is triphenyl phosphite. The light stabilizer is present in parts by weight of 0.8 to 1.2 parts, for example, 1 part.

[0033] In some embodiments of the present invention, the antioxidant is antioxidant 1135. The antioxidant is present in parts by weight of 0.8 to 1.2 parts, for example, 1 part.

[0034] In some embodiments of the present invention, the ultraviolet absorber is UV-531. The ultraviolet absorber is present in parts by weight of 0.8 to 1.2 parts, for example, 1 part.

[0035] In some embodiments of the present invention, the catalyst is dibutyltin dilaurate and / or stannous zincate. The catalyst is present in parts by weight of 0.05 to 0.15, for example, 0.1 parts.

[0036] This invention also provides a method for preparing the high-temperature resistant and wear-resistant polyurethane elastomer described above, comprising the following steps:

[0037] A) Under protective gas conditions, polyol, F-series polyaspartic acid ester resin and isocyanate were stirred and reacted to obtain a prepolymer;

[0038] B) The prepolymer, chain extender, light stabilizer, antioxidant, UV absorber and catalyst are stirred and mixed, vulcanized and molded, and then cured to obtain a high-temperature resistant and wear-resistant polyurethane elastomer.

[0039] Regarding step A):

[0040] Under protective gas conditions, polyol, F-series polyaspartic ester resin and isocyanate were stirred and reacted to obtain a prepolymer.

[0041] In some embodiments of the present invention, the protective gas is nitrogen.

[0042] In some embodiments of the present invention, before stirring and reacting the polyol, F-series polyaspartic ester resin, and isocyanate, the following steps are also included:

[0043] The polyol and F-series polyaspartic ester resin were stirred to remove water.

[0044] The temperature for the stirring and dehydration process is 110–120°C, for example, 120°C; the time is 2–3 hours, for example, 2 hours. The stirring and dehydration process is carried out under protective gas conditions. The protective gas can be nitrogen.

[0045] After vacuum dehydration, the process further includes cooling. Cooling can be natural cooling. The temperature after cooling is 55–65°C, for example, 60°C.

[0046] In some embodiments of the present invention, the temperature of the stirring reaction is 75-85°C, for example, 75°C; and the time is 2-3 hours, for example, 2 hours.

[0047] Regarding step B):

[0048] The prepolymer, chain extender, light stabilizer, antioxidant, UV absorber and catalyst are stirred and mixed, vulcanized and molded, and then cured to obtain a high-temperature resistant and wear-resistant polyurethane elastomer.

[0049] In some embodiments of the present invention, the vulcanization temperature is 115–125°C, for example, 120°C; and the time is 1–2 hours, for example, 1 hour. The vulcanization is performed in a flat vulcanizing machine. The vulcanization is performed in a mold. After vulcanization, the process further includes demolding.

[0050] In some embodiments of the present invention, the curing temperature is 100-120°C, for example 100°C; and the time is 22-26 hours, for example 24 hours.

[0051] The present invention does not impose any special restrictions on the source of the raw materials used above, and they can be commercially available.

[0052] To further illustrate the present invention, the following detailed description of a high-temperature resistant and wear-resistant polyurethane elastomer and its preparation method provided by the present invention is provided in conjunction with embodiments, but it should not be construed as limiting the scope of protection of the present invention.

[0053] Example 1

[0054] 1) Under nitrogen protection, 42.1 parts by weight of polytetrahydrofuran diol (weight average molecular weight 650) and 10.5 parts by weight of F-series polyaspartic acid ester resin (F420) were stirred at 120°C to remove water for 2 hours, and then naturally cooled to 60°C; 26.3 parts by weight of isocyanate (TDI) were added, and the mixture was stirred at 75°C for 2 hours under nitrogen protection to obtain the prepolymer.

[0055] 2) The prepolymer, chain extender 3,3'-dichloro-4,4'-diaminodiphenylmethane (MOCA) 18 parts by weight, light stabilizer triphenyl phosphite 1 part by weight, antioxidant 1135 1 part by weight, UV-531 ultraviolet absorber 1 part by weight, and catalyst dibutyltin dilaurate 0.1 parts by weight were stirred evenly, poured into a mold, and vulcanized at 120℃ for 1 hour in a flat vulcanizing machine. After demolding, it was post-cured in an oven at 100℃ for 24 hours. The sample was then removed to obtain a high-temperature resistant and wear-resistant polyurethane elastomer. After being placed at room temperature for 7 days, performance tests were conducted. The performance test results are shown in Table 1.

[0056] Example 2

[0057] The difference from Example 1 is as follows:

[0058] Replace F-series polyaspartic acid ester resin (F420) with F-series polyaspartic acid ester resin (F520).

[0059] The remaining steps were the same as in Example 1, resulting in a high-temperature resistant and wear-resistant polyurethane elastomer. After being placed at room temperature for 7 days, performance tests were conducted. The performance test results are shown in Table 1.

[0060] Example 3

[0061] The difference from Example 1 is as follows:

[0062] Replace F-series polyaspartic ester resin (F420) with F-series polyaspartic ester resin (F524).

[0063] The remaining steps were the same as in Example 1, resulting in a high-temperature resistant and wear-resistant polyurethane elastomer. After being placed at room temperature for 7 days, performance tests were conducted. The performance test results are shown in Table 1.

[0064] Comparative Example 1

[0065] 1) Under nitrogen protection, 31.5 parts by weight of polytetrahydrofuran diol (weight average molecular weight 650) were stirred at 120°C to remove water for 2 hours, and then naturally cooled to 60°C; 26.3 parts by weight of isocyanate (TDI) were added, and the mixture was stirred at 75°C for 2 hours under nitrogen protection to obtain the prepolymer.

[0066] 2) The prepolymer, chain extender 3,3'-dichloro-4,4'-diaminodiphenylmethane (MOCA) 18 parts by weight, light stabilizer triphenyl phosphite 1 part by weight, antioxidant 1135 1 part by weight, UV-531 ultraviolet absorber 1 part by weight, and catalyst dibutyltin dilaurate 0.1 parts by weight were stirred evenly, poured into a mold, and vulcanized at 120℃ for 1 hour in a flat vulcanizing machine. After demolding, it was post-cured in an oven at 100℃ for 24 hours. The sample was then removed to obtain polyurethane elastomer, which was placed at room temperature for 7 days before performance testing. The performance test results are shown in Table 1.

[0067] Comparative Example 2

[0068] The difference from Example 2 is as follows:

[0069] Replace F-series polyaspartic ester resin (F520) with polyaspartic ester resin 2872.

[0070] The remaining steps were the same as in Example 2, resulting in a polyurethane elastomer, which was then subjected to performance testing after being placed at room temperature for 7 days. The performance test results are shown in Table 1.

[0071] In the performance tests, the tensile testing instrument was an Instro5960 testing machine; the Akron abrasion test was conducted using an Akron abrasion testing machine, model GT-7012-A.

[0072] Table 1. Performance test results of polyurethane elastomers from Examples 1-3 and Comparative Examples 1-2.

[0073]

[0074] The descriptions of the above embodiments are merely illustrative of the methods and core ideas of the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-temperature resistant and wear-resistant polyurethane elastomer, prepared from raw materials comprising the following components in parts by weight; 40-60 parts of polyol; 20-30 parts isocyanate; 1-20 parts of F-series polyaspartic ester resin; Chain extender 1-20 parts; Light stabilizer 0.5-2 parts; Antioxidant 0.5-2 parts; 0.5 to 2 parts of ultraviolet absorber; Catalyst 0.01~0.5 parts; The F-series polyaspartic acid ester resin includes at least one of F420, F520, and F524; The chain extender includes at least one of 1,4-butanediol, 1,6-hexanediol, and 3,3'-dichloro-4,4'-diaminodiphenylmethane.

2. The high-temperature resistant and wear-resistant polyurethane elastomer according to claim 1, characterized in that, The polyols include polyether polyols or polyester polyols; The weight-average molecular weight of the polyol is 500-3000.

3. The high-temperature resistant and wear-resistant polyurethane elastomer according to claim 1, characterized in that, The isocyanate includes at least one of toluene diisocyanate, diphenylmethane diisocyanate, dimethylbiphenyl diisocyanate, naphthalene-1,5-diisocyanate, terephthalic diisocyanate, and hexamethylene diisocyanate trimer.

4. The high-temperature resistant and wear-resistant polyurethane elastomer according to claim 1, characterized in that, The light stabilizer includes triphenyl phosphite; The antioxidant includes antioxidant 1135; The ultraviolet absorber includes UV-531; The catalyst comprises dibutyltin dilaurate and / or stannous zincate.

5. A method for preparing the high-temperature resistant and wear-resistant polyurethane elastomer according to any one of claims 1 to 4, comprising the following steps: A) Under protective gas conditions, polyol, F-series polyaspartic acid ester resin and isocyanate were stirred and reacted to obtain a prepolymer; B) The prepolymer, chain extender, light stabilizer, antioxidant, UV absorber and catalyst are stirred and mixed, vulcanized and molded, and then cured to obtain a high-temperature resistant and wear-resistant polyurethane elastomer.

6. The preparation method according to claim 5, characterized in that, In step A), the protective gas is nitrogen; The stirring reaction is carried out at a temperature of 75-85℃ for 2-3 hours.

7. The preparation method according to claim 5, characterized in that, In step B), the vulcanization molding temperature is 115~125℃ and the time is 1~2 h.

8. The preparation method according to claim 5, characterized in that, In step B), the ripening temperature is 100~120℃ and the time is 22~26 h.

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