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

Abstract

The invention relates to the technical field of high polymer materials, in particular to a 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 the following raw materials in parts by weight; 40 to 60 parts of polyol; 20 to 30 parts of isocyanate; 1 to 20 parts of F series polyaspartic acid ester resin; 1-20 parts of a chain extender; 0.5-2 parts of a light stabilizer; 0.5 to 2 parts of an antioxidant; 0.5-2 parts of an ultraviolet absorbent; and 0.01 to 0.5 part of a catalyst. The F-series polyaspartic acid ester resin and the hydroxyl-containing polymer are mixed and dissolved and then react with-NCO-containing isocyanate to generate a polyurethane elastomer, so that the wear resistance and high temperature resistance of the material can be effectively improved. The F-series polyaspartic acid ester resin can be well matched with other components in a specific ratio, so that the wear resistance and high temperature resistance of the polyurethane elastomer are further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and particularly relates to a high-temperature resistant and wear-resistant polyurethane elastomer and a preparation method thereof. Background Art

[0002] The physical and chemical properties of polyurethane depend on the types and proportions of raw materials during synthesis. Generally speaking, the types of raw materials, such as the number of functional groups, molecular structure, and molecular weight within each reactant molecule, determine the characteristics of the final polyurethane material and how it will form. Although polyurethane has excellent properties, for extremely special working conditions, many disadvantages will still be exposed, such as poor high-temperature resistance, wear resistance, and weather resistance.

[0003] Currently, mainly through molecular modification design, chemical cross-linking methods are used to increase the connection points between molecules, improve the cross-linking density between polyurethane molecules, and form a more stable network structure, thereby enhancing its wear resistance and mechanical strength. Or by adding inorganic fillers (such as carbon black, silica, molybdenum disulfide, etc.) to polyurethane, its hardness, wear resistance, and thermal stability can be significantly improved. However, methods such as chemical cross-linking and fillers will affect the mechanical properties of the material, reduce mechanical properties such as the elongation at break of the material, and at the same time, the material cannot 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 a preparation method thereof. The high-temperature resistant and wear-resistant polyurethane elastomer provided by the present invention has excellent high-temperature resistance and wear resistance.

[0005] The present 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 - 3000.

[0011] Preferably, the isocyanate includes at least one of toluene diisocyanate, diphenylmethane diisocyanate, dimethylbiphenyl diisocyanate, naphthalene-1,5-diisocyanate, p-phenylene diisocyanate, toluene diisocyanate, and hexamethylene diisocyanate trimer.

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

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

[0014] The antioxidant includes antioxidant 1135;

[0015] The ultraviolet absorber includes UV-531;

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

[0017] The present 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 the condition of a protective gas, polyol, F-series polyaspartate resin, and isocyanate are stirred and reacted to obtain a prepolymer;

[0019] B) The prepolymer, chain extender, light stabilizer, antioxidant, ultraviolet absorber, and catalyst are stirred and mixed evenly, vulcanized and molded, and after curing, a high-temperature resistant and wear-resistant polyurethane elastomer is obtained.

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

[0021] The temperature of the stirring reaction is 75-85°C; the time is 2-3 h.

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

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

[0024] The present invention provides a high-temperature resistant and wear-resistant polyurethane elastomer, which is prepared from raw materials including the following components in parts by weight; 40-60 parts of polyol; 20-30 parts of isocyanate; 1-20 parts of F-series polyaspartate resin; 1-20 parts of chain extender; 0.5-2 parts of light stabilizer; 0.5-2 parts of antioxidant; 0.5-2 parts of ultraviolet absorber; 0.01-0.5 parts of catalyst. In the present invention, after the F-series polyaspartate resin is miscible with the hydroxyl-containing polymer, it reacts with the -NCO-containing isocyanate to form a polyurethane elastomer, which can effectively improve the wear resistance and high-temperature resistance of the material. The F-series polyaspartate resin can cooperate well with other components in a specific ratio, further improving the wear resistance and high-temperature resistance of the polyurethane elastomer. Detailed Description

[0025] Next, in combination with the embodiments of the present invention, the technical solutions of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0026] The present invention provides a high-temperature resistant and wear-resistant polyurethane elastomer, which is prepared from raw materials including the following components 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 fraction of the polyol is 40 to 45 parts, for example, 42.1 parts.

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

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

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

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

[0033] In some embodiments of the present invention, the antioxidant is antioxidant 1135. The weight fraction of the antioxidant is 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 weight parts of the ultraviolet absorber are 0.8 to 1.2 parts, such as 1 part.

[0035] In some embodiments of the present invention, the catalyst is dibutyltin dilaurate and / or stannous zincate. The weight parts of the catalyst are 0.05 to 0.15 parts, such as 0.1 part.

[0036] The present invention also provides a preparation method of the high-temperature resistant and wear-resistant polyurethane elastomer described above, comprising the following steps:

[0037] A) Under the condition of a protective gas, polyol, F-series polyaspartate resin and isocyanate are stirred and reacted to obtain a prepolymer;

[0038] B) The prepolymer, chain extender, light stabilizer, antioxidant, ultraviolet absorber and catalyst are stirred and mixed evenly, vulcanized and molded, and after curing, a high-temperature resistant and wear-resistant polyurethane elastomer is obtained.

[0039] Regarding step A):

[0040] Under the condition of a protective gas, polyol, F-series polyaspartate resin and isocyanate are 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 polyol, F-series polyaspartate resin and isocyanate, it further includes:

[0043] Stir polyol and F-series polyaspartate resin to remove water.

[0044] The temperature of the water removal by stirring is 110 to 120 °C, such as 120 °C; the time is 2 to 3 h, such as 2 h. The water removal by stirring is carried out under the condition of a protective gas. The protective gas can be nitrogen.

[0045] After the vacuum water removal, it further includes: cooling. The cooling can be natural cooling. The temperature after cooling is 55 to 65 °C, such as 60 °C.

[0046] In some embodiments of the present invention, the temperature of the stirring reaction is 75 to 85 °C, such as 75 °C; the time is 2 to 3 h, such as 2 h.

[0047] Regarding step B):

[0048] The prepolymer, chain extender, light stabilizer, antioxidant, ultraviolet absorber and catalyst are stirred and mixed evenly, vulcanized and molded, and after curing, a high-temperature resistant and wear-resistant polyurethane elastomer is obtained.

[0049] In some embodiments of the present invention, the temperature of the vulcanization molding is 115 - 125 °C, such as 120 °C; the time is 1 - 2 h, such as 1 h. The vulcanization molding is carried out in a flat vulcanizer. The vulcanization molding is carried out in a mold. After the vulcanization molding, it further includes: demolding.

[0050] In some embodiments of the present invention, the temperature of the curing is 100 - 120 °C, such as 100 °C; the time is 22 - 26 h, such as 24 h.

[0051] The present invention has no special restrictions on the raw material sources used above, and they can be generally commercially available.

[0052] In order to further illustrate the present invention, the following provides a detailed description of a high-temperature resistant and wear-resistant polyurethane elastomer and its preparation method according to the present invention in combination with examples, but it should not be construed as a limitation to the protection scope 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 polyaspartate resin (F420) were stirred to remove water at 120 °C for 2 h, and then naturally cooled to 60 °C; 26.3 parts by weight of isocyanate (TDI) was added, and the mixture was stirred and reacted at 75 °C for 2 h under nitrogen protection to obtain a prepolymer.

[0055] 2) The prepolymer, 18 parts by weight of chain extender 3,3'-dichloro-4,4'-diaminodiphenylmethane (MOCA), 1 part by weight of light stabilizer triphenyl phosphite, 1 part by weight of antioxidant 1135, 1 part by weight of UV-531 ultraviolet absorber, and 0.1 part by weight of catalyst dibutyltin dilaurate were stirred evenly, poured into a mold, vulcanization molded at 120 °C for 1 h in a flat vulcanizer, demolded, and then post-cured at 100 °C in an oven for 24 h. The specimen was taken out to obtain a high-temperature resistant and wear-resistant polyurethane elastomer, and the performance test was carried out after standing at room temperature for 7 days. The performance test results are shown in Table 1.

[0056] Example 2

[0057] The difference from Example 1 is that:

[0058] The F-series polyaspartate resin (F420) was replaced with the F-series polyaspartate resin (F520).

[0059] The remaining steps were the same as those in Example 1 to obtain a high-temperature resistant and wear-resistant polyurethane elastomer, and the performance test was carried out after standing at room temperature for 7 days. The performance test results are shown in Table 1.

[0060] Example 3

[0061] The difference from Example 1 is that:

[0062] The F-series polyaspartate resin (F420) is replaced with the F-series polyaspartate resin (F524).

[0063] The remaining steps are the same as those in Example 1 to obtain a high-temperature resistant and wear-resistant polyurethane elastomer, and performance testing is carried out after being placed at room temperature for 7 days. 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) was stirred to remove water at 120 °C for 2 h, and then naturally cooled to 60 °C; 26.3 parts by weight of isocyanate (TDI) was added, and the mixture was stirred and reacted at 75 °C for 2 h under nitrogen protection to obtain a prepolymer.

[0066] 2) The prepolymer, 18 parts by weight of chain extender 3,3'-dichloro-4,4'-diaminodiphenylmethane (MOCA), 1 part by weight of light stabilizer triphenyl phosphite, 1 part by weight of antioxidant 1135, 1 part by weight of UV-531 ultraviolet absorber, and 0.1 part by weight of catalyst dibutyltin dilaurate were stirred evenly, poured into a mold, vulcanized and molded at 120 °C for 1 h in a flat vulcanizer, and after demolding, post-cured in an oven at 100 °C for 24 h, and the specimen was taken out to obtain a polyurethane elastomer, and performance testing was carried out after being placed at room temperature for 7 days. The performance test results are shown in Table 1.

[0067] Comparative Example 2

[0068] The difference from Example 2 is that:

[0069] The F-series polyaspartate resin (F520) is replaced with polyaspartate resin 2872.

[0070] The remaining steps are the same as those in Example 2 to obtain a polyurethane elastomer, and performance testing is carried out after being placed at room temperature for 7 days. The performance test results are shown in Table 1.

[0071] In the performance test, the tensile testing instrument is an Instron testing machine, model instro5960; the Akron abrasion test is carried out using an Akron abrasion tester, model GT-7012-A.

[0072] Table 1 Performance test results of polyurethane elastomers in Examples 1 to 3 and Comparative Examples 1 to 2

[0073]

[0074] The description of the above embodiments is only used to help understand the method of the present invention and its core idea. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high temperature and wear resistant polyurethane elastomer, prepared from raw materials comprising the following components in parts by weight; 2. The high temperature and wear resistant polyurethane elastomer according to claim 1, characterized in that: The F series polyaspartic acid ester resin includes at least one of F420, F520 and F524.

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

4. The high temperature 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, p-phenylene diisocyanate, toluene diisocyanate and hexamethylene diisocyanate trimer.

5. The high temperature and wear resistant polyurethane elastomer according to claim 1, characterized in that: The chain extender includes at least one of 1,4-butanediol, 1,6-hexanediol and 3,3'-dichloro-4,4'-diaminodiphenylmethane.

6. The high temperature 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 includes dibutyltin dilaurate and / or stannous zincate.

7. A method for preparing the high temperature resistant and wear resistant polyurethane elastomer according to any one of claims 1 to 6, comprising the following steps: A) under the condition of protective gas, a polyol, an F series polyaspartic acid ester resin and an isocyanate are stirred and reacted to obtain a prepolymer; B) stirring and mixing the prepolymer, chain extender, light stabilizer, antioxidant, ultraviolet absorber and catalyst, vulcanizing and forming, and aging to obtain a high temperature and wear resistant polyurethane elastomer.

8. The preparation method according to claim 7, characterized in that: In step A), the protective gas is nitrogen; The stirring reaction is carried out at a temperature of 75 to 85° C. and for 2 to 3 hours.

9. The preparation method according to claim 7, characterized in that: In step B), the vulcanization molding temperature is 115-125° C. and the time is 1-2 hours.

10. The preparation method according to claim 7, characterized in that: In step B), the aging temperature is 100-120° C. and the time is 22-26 hours.

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