High-wear-resistance polyurethane packaging material for electronic products and preparation method of high-wear-resistance polyurethane packaging material

Abstract

The invention relates to the technical field of polyurethane packaging materials, and discloses a high-wear-resistance polyurethane packaging material for electronic products and a preparation method thereof.The preparation method specifically comprises the following steps that sulfur-containing modified polyurethane, sodium sulfonate modified adamantane, an antioxidant 245 and silicon carbide are stirred and mixed, then water is added into the mixture, stirring foaming is conducted, the stirring rotating speed is 1000-1100 r / min, stirring is conducted for 30-60 min, and the high-wear-resistance polyurethane packaging material is obtained. And injecting the foamed mixture into a mold, and curing and molding to obtain the high-wear-resistance polyurethane packaging material. The high-wear-resistance polyurethane packaging material disclosed by the invention has relatively good flame-retardant and wear-resistant effects.

Description

Technical Field

[0001] The present application relates to the technical field of polyurethane packaging materials, and more specifically, to a highly wear-resistant polyurethane packaging material for electronic products and a preparation method thereof. Background Art

[0002] With the widespread application of electronic products in today's society, the requirements for electronic product packaging materials are also increasing. Traditional packaging materials have deficiencies in wear resistance, which can easily lead to wear during storage and use, thus affecting their normal use. Therefore, it is of great significance to develop an electronic product packaging material with high wear resistance and environmental protection. The Chinese invention patent application with publication number CN115873206B discloses a flame retardant polyurethane material and a preparation method thereof. The polyurethane material of the invention has good flame retardancy and is green and environmentally friendly, but its wear resistance has not been improved. Summary of the invention

[0003] In order to prepare a flame-retardant and wear-resistant polyurethane packaging material, the present application provides a highly wear-resistant polyurethane packaging material for electronic products and a preparation method thereof.

[0004] The present application provides a highly wear-resistant polyurethane packaging material for electronic products and a preparation method thereof, which adopts the following technical scheme:

[0005] A highly wear-resistant polyurethane packaging material for electronic products, comprising the following components by weight: 40-60 parts by weight of sulfur-containing modified polyurethane, 2-3 parts by weight of sodium sulfonate modified adamantane, 1-2 parts by weight of antioxidant 245, 2-4 parts by weight of silicon carbide, and 2-3 parts by weight of water;

[0006] The preparation method of the sulfur-containing modified polyurethane is:

[0007] S1. Add 1,3,5-trihydroxyadamantane and 4-aminophenylboronic acid to tetrahydrofuran solvent, stir and mix, continue to add anhydrous magnesium sulfate, heat to 50-65°C, stir at 300-350r / min for 4-6h, and vacuum dry to obtain aminoadamantane;

[0008] S2. Adding amino adamantane and pyridine catalyst to N,N-dimethylformamide solvent, stirring and dissolving, and then adding 4-vinylbenzoyl chloride to it, reacting at 30-40° C., and concentrating the solution after completion, washing, and obtaining alkenyl adamantane;

[0009] S3. Add olefinated adamantane to N,N-dimethylformamide solvent, stir and disperse, add mercaptoethylamine and benzoin dimethyl ether photoinitiator, irradiate with 365nm ultraviolet light at 25-40°C for 2-5h, centrifuge, wash and dry to obtain adamantyl chain extender;

[0010] S4. After removing water from polytetrahydrofuran diol, mix it evenly with hexamethylene diisocyanate, introduce nitrogen, then add dibutyltin dilaurate catalyst dropwise, react at 60-75°C for 2-5h, perform prepolymerization, then add adamantyl chain extender, stir to continue chain extension reaction, react at 50-60°C for 4-6h, after the reaction is completed, cool and discharge to obtain sulfur-modified polyurethane.

[0011] Furthermore, the mass ratio of 1,3,5-trihydroxyadamantane, 4-aminophenylboric acid and anhydrous magnesium sulfate in S1 is 1.24-1.33 g: 0.7-0.84 g: 0.013-0.021 g.

[0012] Furthermore, the mass ratio of the aminoadamantane, the pyridine catalyst and the 4-vinylbenzoyl chloride in S2 is 1 g: 0.014-0.023 g: 2.36-2.58 g.

[0013] Furthermore, the reaction time in S2 is 5-7h.

[0014] Furthermore, the mass ratio of olefinated adamantane, mercaptoethylamine and benzoin dimethyl ether photoinitiator in S3 is 1.26-1.35 g: 3.1-3.32 g: 0.026-0.028 g.

[0015] Furthermore, the mass ratio of polytetrahydrofuran diol, hexamethylene diisocyanate, dibutyltin dilaurate catalyst, and adamantyl chain extender in S4 is 1.33-1.5g: 0.82-0.9g: 0.02-0.024g: 0.3-0.5g.

[0016] Furthermore, the preparation method of the sodium sulfonate modified adamantane is: add 1.4-1.6g of adamantyl chain extender and 1.34-1.53g of propenyl-1,3-sultone into tetrahydrofuran solvent for dissolution, then dropwise add 3-5mL of 2-4% sodium hydroxide solution, react at 60-66°C for 5-7h, concentrate under reduced pressure after the reaction to remove the solvent, wash, and obtain the sodium sulfonate modified adamantane.

[0017] In the above reaction process, the amino group in the adamantyl chain extender reacts with propenyl-1,3-sultone to generate a sodium sulfonate group, thereby obtaining a sodium sulfonate-modified adamantane.

[0018] Furthermore, the preparation method of the highly wear-resistant polyurethane packaging material is: sulfur-modified polyurethane, sodium sulfonate-modified adamantane, antioxidant 245, and silicon carbide are stirred and mixed, and then water is added thereto, stirred and foamed, and the stirring speed is 1000-1100r / min, and the foamed mixture is injected into a mold, and matured and formed to obtain a highly wear-resistant polyurethane packaging material.

[0019] In the above reaction process, the hydroxyl group in 1,3,5-trihydroxyadamantane and the boric acid group in 4-aminophenylboronic acid are subjected to esterification reaction to introduce the amino group, and then the reaction with the acyl chloride in 4-vinylbenzoyl chloride is continued to introduce the olefinic group, and then the click reaction with the thiol group in mercaptoethylamine is carried out to introduce the amine group, thereby obtaining the adamantyl chain extender; after dehydrating the polytetrahydrofuran diol, it is evenly mixed with hexamethylene diisocyanate, and then the dibutyltin dilaurate catalyst is added dropwise to carry out prepolymerization, and then the adamantyl chain extender is added to obtain the sulfur-containing modified polyurethane.

[0020] In summary, this application has the following beneficial effects:

[0021] The invention comprises the following steps: mixing sulfur-containing modified polyurethane, sodium sulfonate modified adamantane, antioxidant 245 and silicon carbide, adding water thereto, stirring and foaming the mixture at a stirring speed of 1000-1100 r / min, injecting the foamed mixture into a mold, and ripening and forming the mixture to obtain a highly wear-resistant polyurethane packaging material.

[0022] 1. The sulfur and boron elements contained in sulfur-modified polyurethane and the sodium sulfonate group in sodium sulfonate-modified adamantane have good flame retardant effects. When heated, silicon can produce a glassy substance on the surface of the material, isolating material transport and energy transfer, and has a flame retardant effect. The sodium sulfonate group can promote the release of carbon dioxide and water during combustion, which helps to improve the flame retardant effect. Boron melts at high temperatures to form a glassy covering layer that covers the surface of the burning material, isolating oxygen and heat, and achieves a flame retardant effect.

[0023] 2. The chains in the sulfur-modified polyurethane will cross-link with the molecular chains of sodium sulfonate-modified adamantane, which strengthens the connection and interaction between molecules, makes the material tighter, better able to resist external forces, and achieves a better friction effect. The adamantane groups in polyurethane and sodium sulfonate-modified adamantane have good rigidity and also have a good wear-resistant effect. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] S1. Add 1.24 g of 1,3,5-trihydroxyadamantane and 0.7 g of 4-aminophenylboronic acid to 35 mL of tetrahydrofuran solvent, stir and mix, continue to add 0.013 g of anhydrous magnesium sulfate, heat to 50°C, stir at 300 r / min for 4 h, and vacuum dry to obtain aminoadamantane;

[0027] S2. Add 1 g of amino adamantane and 0.014 g of pyridine catalyst to 40 mL of N,N-dimethylformamide solvent, stir to dissolve, then add 2.36 g of 4-vinylbenzoyl chloride, react at 30 ° C for 5 h, concentrate the solution after reaction, wash, and obtain alkenyl adamantane;

[0028] S3. Add 1.26 g of olefinated adamantane to 35 mL of N,N-dimethylformamide solvent, stir and disperse, then add 3.1 g of mercaptoethylamine and 0.026 g of benzoin dimethyl ether photoinitiator, irradiate with 365 nm ultraviolet light at 25 ° C for 2 h, centrifuge, wash and dry to obtain adamantane chain extender;

[0029] S4. 1.33 g of polytetrahydrofuran diol was removed from water and mixed with 0.82 g of hexamethylene diisocyanate, nitrogen was introduced, and then 0.02 g of dibutyltin dilaurate catalyst was added dropwise, and the mixture was reacted at 60 ° C for 2 h to perform prepolymerization, and then 0.3 g of adamantyl chain extender was added, and the chain extension reaction was continued with stirring, and the reaction was performed at 50 ° C for 4 h. After the reaction was completed, the mixture was cooled and discharged to obtain sulfur-modified polyurethane;

[0030] S5. Add 1.4 g of adamantyl chain extender and 1.34 g of propenyl-1,3-sultone to 40 mL of tetrahydrofuran solvent to dissolve, then dropwise add 3 mL of 2% sodium hydroxide solution, react at 60° C. for 5 h, concentrate under reduced pressure to remove the solvent, wash, and obtain sodium sulfonate modified adamantane;

[0031] S6. 40 parts by weight of sulfur-modified polyurethane, 2 parts by weight of sodium sulfonate-modified adamantane, 1 part by weight of antioxidant 245, and 2 parts by weight of silicon carbide are stirred and mixed, and then 2 parts by weight of water are added thereto, and stirred and foamed at a stirring speed of 1000 r / min. The foamed mixture is injected into a mold, matured and formed, and a highly wear-resistant polyurethane packaging material is obtained.

[0032] Example 2

[0033] S1. Add 1.33 g of 1,3,5-trihydroxyadamantane and 0.84 g of 4-aminophenylboronic acid to 45 mL of tetrahydrofuran solvent, stir and mix, continue to add 0.021 g of anhydrous magnesium sulfate, heat to 65 ° C, stir at 350 r / min for 6 hours, and vacuum dry to obtain amino adamantane;

[0034] S2. Add 1 g of amino adamantane and 0.023 g of pyridine catalyst to 50 mL of N,N-dimethylformamide solvent, stir to dissolve, then add 2.58 g of 4-vinylbenzoyl chloride, react at 40 ° C for 7 h, concentrate the solution after reaction, wash, and obtain alkenyl adamantane;

[0035] S3. Add 1.35 g of olefinated adamantane to 46 mL of N,N-dimethylformamide solvent, stir and disperse, then add 3.32 g of mercaptoethylamine and 0.028 g of benzoin dimethyl ether photoinitiator, irradiate with 365 nm ultraviolet light at 40 ° C for 5 h, centrifuge, wash and dry to obtain an adamantyl chain extender;

[0036] S4. 1.5 g of polytetrahydrofuran diol was removed from water and mixed with 0.9 g of hexamethylene diisocyanate, nitrogen was introduced, and then 0.024 g of dibutyltin dilaurate catalyst was added dropwise, and the mixture was reacted at 75 ° C for 5 h to perform prepolymerization, and then 0.5 g of adamantyl chain extender was added, and the chain extension reaction was continued with stirring, and the reaction was performed at 60 ° C for 6 h. After the reaction was completed, the mixture was cooled and discharged to obtain sulfur-modified polyurethane;

[0037] S5. 1.6 g of adamantyl chain extender and 1.53 g of propenyl-1,3-sultone were added to 55 mL of tetrahydrofuran solvent for dissolution, and then 5 mL of 4% sodium hydroxide solution was added dropwise, and the mixture was reacted at 66° C. for 7 h. After the reaction, the solvent was removed by concentration under reduced pressure, and the mixture was washed to obtain sodium sulfonate modified adamantane;

[0038] S6. 60 parts by weight of sulfur-modified polyurethane, 3 parts by weight of sodium sulfonate-modified adamantane, 2 parts by weight of antioxidant 245, and 4 parts by weight of silicon carbide are stirred and mixed, and then 3 parts by weight of water are added thereto, and stirred and foamed at a stirring speed of 1100 r / min. The foamed mixture is injected into a mold, matured and formed, and a highly wear-resistant polyurethane packaging material is obtained.

[0039] Example 3

[0040] S1. Add 1.31 g of 1,3,5-trihydroxyadamantane and 0.81 g of 4-aminophenylboronic acid to 40 mL of tetrahydrofuran solvent, stir and mix, continue to add 0.017 g of anhydrous magnesium sulfate, heat to 55 ° C, stir at 320 r / min for 5 h, and vacuum dry to obtain aminoadamantane;

[0041] S2. Add 1 g of amino adamantane and 0.018 g of pyridine catalyst to 45 mL of N,N-dimethylformamide solvent, stir to dissolve, then add 2.46 g of 4-vinylbenzoyl chloride, react at 35 °C for 6 h, concentrate the solution after reaction, wash, and obtain alkenyl adamantane;

[0042] S3. Add 1.29 g of olefinated adamantane to 42 mL of N,N-dimethylformamide solvent, stir and disperse, then add 3.25 g of mercaptoethylamine and 0.027 g of benzoin dimethyl ether photoinitiator, irradiate with 365 nm ultraviolet light at 30 ° C for 4 h, centrifuge, wash and dry to obtain an adamantyl chain extender;

[0043] S4. 1.43 g of polytetrahydrofuran diol was removed from water and mixed with 0.85 g of hexamethylene diisocyanate, nitrogen was introduced, and then 0.022 g of dibutyltin dilaurate catalyst was added dropwise, and the mixture was reacted at 73 ° C for 3 h to perform prepolymerization, and then 0.4 g of adamantyl chain extender was added, and the chain extension reaction was continued with stirring, and the reaction was performed at 55 ° C for 5 h. After the reaction was completed, the mixture was cooled and discharged to obtain sulfur-modified polyurethane;

[0044] S5. 1.5 g of adamantyl chain extender and 1.47 g of propenyl-1,3-sultone were added to 52 mL of tetrahydrofuran solvent to dissolve, and then 4 mL of 3% sodium hydroxide solution was added dropwise, and the mixture was reacted at 63° C. for 6 h. After the reaction, the solvent was removed by concentration under reduced pressure, and the mixture was washed to obtain sodium sulfonate modified adamantane;

[0045] S6. 45 parts by weight of sulfur-modified polyurethane, 2.5 parts by weight of sodium sulfonate-modified adamantane, 1.5 parts by weight of antioxidant 245, and 3 parts by weight of silicon carbide are stirred and mixed, and then 2 parts by weight of water are added thereto, and stirred and foamed at a stirring speed of 1050 r / min. The foamed mixture is injected into a mold, matured and formed, and a highly wear-resistant polyurethane packaging material is obtained.

[0046] Example 4

[0047] S1. Add 1.24 g of 1,3,5-trihydroxyadamantane and 0.7 g of 4-aminophenylboronic acid to 35 mL of tetrahydrofuran solvent, stir and mix, continue to add 0.013 g of anhydrous magnesium sulfate, heat to 50°C, stir at 300 r / min for 4 h, and vacuum dry to obtain aminoadamantane;

[0048] S2. Add 1 g of amino adamantane and 0.014 g of pyridine catalyst to 40 mL of N,N-dimethylformamide solvent, stir to dissolve, then add 2.36 g of 4-vinylbenzoyl chloride, react at 30 ° C for 5 h, concentrate the solution after reaction, wash, and obtain alkenyl adamantane;

[0049] S3. Add 1.35 g of olefinated adamantane to 46 mL of N,N-dimethylformamide solvent, stir and disperse, then add 3.32 g of mercaptoethylamine and 0.028 g of benzoin dimethyl ether photoinitiator, irradiate with 365 nm ultraviolet light at 40 ° C for 5 h, centrifuge, wash and dry to obtain an adamantyl chain extender;

[0050] S4. 1.5 g of polytetrahydrofuran diol was removed from water and mixed with 0.9 g of hexamethylene diisocyanate, nitrogen was introduced, and then 0.024 g of dibutyltin dilaurate catalyst was added dropwise, and the mixture was reacted at 75 ° C for 5 h to perform prepolymerization, and then 0.5 g of adamantyl chain extender was added, and the chain extension reaction was continued with stirring, and the reaction was performed at 60 ° C for 6 h. After the reaction was completed, the mixture was cooled and discharged to obtain sulfur-modified polyurethane;

[0051] S5. 1.5 g of adamantyl chain extender and 1.47 g of propenyl-1,3-sultone were added to 52 mL of tetrahydrofuran solvent to dissolve, and then 4 mL of 3% sodium hydroxide solution was added dropwise, and the mixture was reacted at 63° C. for 6 h. After the reaction, the solvent was removed by concentration under reduced pressure, and the mixture was washed to obtain sodium sulfonate modified adamantane;

[0052] S6. 45 parts by weight of sulfur-modified polyurethane, 2 parts by weight of sodium sulfonate-modified adamantane, 1.5 parts by weight of antioxidant 245, and 3 parts by weight of silicon carbide are stirred and mixed, and then 2 parts by weight of water are added thereto, stirred and foamed at a stirring speed of 1050 r / min, and the foamed mixture is injected into a mold, matured and formed, to obtain a highly wear-resistant polyurethane packaging material.

[0053] Example 5

[0054] S1. Add 1.33 g of 1,3,5-trihydroxyadamantane and 0.84 g of 4-aminophenylboronic acid to 45 mL of tetrahydrofuran solvent, stir and mix, continue to add 0.021 g of anhydrous magnesium sulfate, heat to 65 ° C, stir at 350 r / min for 6 hours, and vacuum dry to obtain amino adamantane;

[0055] S2. Add 1 g of amino adamantane and 0.023 g of pyridine catalyst to 50 mL of N,N-dimethylformamide solvent, stir to dissolve, then add 2.58 g of 4-vinylbenzoyl chloride, react at 40 ° C for 7 h, concentrate the solution after reaction, wash, and obtain alkenyl adamantane;

[0056] S3. Add 1.29 g of olefinated adamantane to 42 mL of N,N-dimethylformamide solvent, stir and disperse, then add 3.25 g of mercaptoethylamine and 0.027 g of benzoin dimethyl ether photoinitiator, irradiate with 365 nm ultraviolet light at 30 ° C for 4 h, centrifuge, wash and dry to obtain an adamantyl chain extender;

[0057] S4. 1.43 g of polytetrahydrofuran diol was removed from water and mixed with 0.85 g of hexamethylene diisocyanate, nitrogen was introduced, and then 0.022 g of dibutyltin dilaurate catalyst was added dropwise, and the mixture was reacted at 73 ° C for 3 h to perform prepolymerization, and then 0.4 g of adamantyl chain extender was added, and the chain extension reaction was continued with stirring, and the reaction was performed at 55 ° C for 5 h. After the reaction was completed, the mixture was cooled and discharged to obtain sulfur-modified polyurethane;

[0058] S5. Add 1.4 g of adamantyl chain extender and 1.34 g of propenyl-1,3-sultone to 40 mL of tetrahydrofuran solvent to dissolve, then dropwise add 3 mL of 2% sodium hydroxide solution, react at 60° C. for 5 h, concentrate under reduced pressure to remove the solvent, wash, and obtain sodium sulfonate modified adamantane;

[0059] S6. 40 parts by weight of sulfur-modified polyurethane, 3 parts by weight of sodium sulfonate-modified adamantane, 1 part by weight of antioxidant 245, and 2 parts by weight of silicon carbide are stirred and mixed, and then 2 parts by weight of water are added thereto, and stirred and foamed at a stirring speed of 1000 r / min. The foamed mixture is injected into a mold, matured and formed, and a highly wear-resistant polyurethane packaging material is obtained.

[0060] Example 6

[0061] S1. Add 1.31 g of 1,3,5-trihydroxyadamantane and 0.81 g of 4-aminophenylboronic acid to 40 mL of tetrahydrofuran solvent, stir and mix, continue to add 0.017 g of anhydrous magnesium sulfate, heat to 55 ° C, stir at 320 r / min for 5 h, and vacuum dry to obtain aminoadamantane;

[0062] S2. Add 1 g of amino adamantane and 0.018 g of pyridine catalyst to 45 mL of N,N-dimethylformamide solvent, stir to dissolve, then add 2.46 g of 4-vinylbenzoyl chloride, react at 35 °C for 6 h, concentrate the solution after reaction, wash, and obtain alkenyl adamantane;

[0063] S3. Add 1.26 g of olefinated adamantane to 35 mL of N,N-dimethylformamide solvent, stir and disperse, then add 3.1 g of mercaptoethylamine and 0.026 g of benzoin dimethyl ether photoinitiator, irradiate with 365 nm ultraviolet light at 25 ° C for 2 h, centrifuge, wash and dry to obtain adamantane chain extender;

[0064] S4. 1.5 g of polytetrahydrofuran diol was removed from water and mixed with 0.9 g of hexamethylene diisocyanate, nitrogen was introduced, and then 0.024 g of dibutyltin dilaurate catalyst was added dropwise, and the mixture was reacted at 75 ° C for 5 h to perform prepolymerization, and then 0.5 g of adamantyl chain extender was added, and the chain extension reaction was continued with stirring, and the reaction was performed at 60 ° C for 6 h. After the reaction was completed, the mixture was cooled and discharged to obtain sulfur-modified polyurethane;

[0065] S5. 1.6 g of adamantyl chain extender and 1.53 g of propenyl-1,3-sultone were added to 55 mL of tetrahydrofuran solvent for dissolution, and then 5 mL of 4% sodium hydroxide solution was added dropwise, and the mixture was reacted at 66° C. for 7 h. After the reaction, the solvent was removed by concentration under reduced pressure, and the mixture was washed to obtain sodium sulfonate modified adamantane;

[0066] S6. 60 parts by weight of sulfur-modified polyurethane, 2.5 parts by weight of sodium sulfonate-modified adamantane, 2 parts by weight of antioxidant 245, and 4 parts by weight of silicon carbide are stirred and mixed, and then 3 parts by weight of water are added thereto, and stirred and foamed at a stirring speed of 1100 r / min. The foamed mixture is injected into a mold, matured and formed, and a highly wear-resistant polyurethane packaging material is obtained.

[0067] Comparative Example 1

[0068] Compared with Example 6, this comparative example differs in that an adamantane chain extender is used instead of sodium sulfonate to modify adamantane.

[0069] Comparative Example 2

[0070] Compared with Example 6, the difference between this comparative example is that no adamantyl chain extender is added to S4.

[0071] Performance test (flame retardancy test, abrasion resistance test)

[0072] Referring to the method described in the national standard GB / T 2406, an oxygen index meter is used to test the limiting oxygen index of the material; a horizontal and vertical combustion instrument is used to test the combustion grade of the material.

[0073] Table 1: Flame retardancy tests.

[0074] project Limiting oxygen index (%) Combustion level Example 1 31.25 V-0 Example 2 33.48 V-0 Example 3 32.71 V-0 Example 4 32.64 V-0 Example 5 31.07 V-0 Example 6 32.49 V-0 Comparative Example 1 23.59 V-1 Comparative Example 2 21.15 V-1

[0075] As shown in Table 1, the flame retardant effect of Examples 1-6 is better than that of Comparative Examples 1-2, indicating that the flame retardant effect of the high wear-resistant polyurethane packaging material prepared by the present invention is good. As shown in the results of Comparative Example 1, after the adamantane chain extender is used instead of sodium sulfonate to modify adamantane, the flame retardant performance of the obtained high wear-resistant polyurethane packaging material decreases. As shown in the results of Comparative Example 2, after the adamantane chain extender is not added to S4, the flame retardant performance of the obtained high wear-resistant polyurethane packaging material decreases.

[0076] The highly wear-resistant polyurethane packaging materials obtained in the above Examples 1-6 and Comparative Examples 1-2 were placed in an abrasion machine for wear resistance testing, and the test was performed with reference to the method described in GB / T 26689. The specific parameters were set as follows:

[0077] Speed: 72RPM, Grinding wheel: CS-10, Load: 1 kg, Number of rotations: 1000 times.

[0078] Table 2: Abrasion resistance test.

[0079] project Initial mass (g) Mass after wear (g) Wear amount (g) Example 1 10.000 9.948 0.052 Example 2 10.000 9.953 0.047 Example 3 10.000 9.949 0.051 Example 4 10.000 9.952 0.048 Example 5 10.000 9.951 0.049 Example 6 10.000 9.948 0.052 Comparative Example 1 10.000 9.946 0.054 Comparative Example 2 10.000 9.928 0.072

[0080] As shown in Table 2, the wear amount of Examples 1-6 and Comparative Example 1 is less than that of Comparative Example 2, indicating that the high wear-resistant polyurethane packaging material prepared by the present invention has good wear resistance. As shown in the results of Comparative Example 2, after no adamantyl chain extender is added to S4, the wear resistance of the obtained high wear-resistant polyurethane packaging material decreases.

[0081] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0082] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A highly wear-resistant polyurethane packaging material for electronic products, characterized in that: The invention comprises the following components by weight: 40-60 parts by weight of sulfur-containing modified polyurethane, 2-3 parts by weight of sodium sulfonate modified adamantane, 1-2 parts by weight of antioxidant 245, 2-4 parts by weight of silicon carbide, and 2-3 parts by weight of water; The preparation method of the sulfur-containing modified polyurethane is: S1. Add 1,3,5-trihydroxyadamantane and 4-aminophenylboronic acid to tetrahydrofuran solvent, stir and mix, continue to add anhydrous magnesium sulfate, heat to 50-65°C, stir at 300-350r / min for 4-6h, and vacuum dry to obtain aminoadamantane; S2. Adding amino adamantane and pyridine catalyst to N,N-dimethylformamide solvent, stirring and dissolving, and then adding 4-vinylbenzoyl chloride to it, reacting at 30-40° C., and concentrating the solution after completion, washing, and obtaining alkenyl adamantane; S3. Add olefinated adamantane to N,N-dimethylformamide solvent, stir and disperse, add mercaptoethylamine and benzoin dimethyl ether photoinitiator, irradiate with 365nm ultraviolet light at 25-40°C for 2-5h, centrifuge, wash and dry to obtain adamantyl chain extender; S4. After removing water from polytetrahydrofuran diol, mix it evenly with hexamethylene diisocyanate, introduce nitrogen, then add dibutyltin dilaurate catalyst dropwise, react at 60-75°C for 2-5h, perform prepolymerization, then add adamantyl chain extender, stir to continue chain extension reaction, react at 50-60°C for 4-6h, after the reaction is completed, cool and discharge to obtain sulfur-modified polyurethane.

2. The highly wear-resistant polyurethane packaging material for electronic products according to claim 1, characterized in that: The mass ratio of 1,3,5-trihydroxyadamantane, 4-aminophenylboric acid and anhydrous magnesium sulfate in S1 is 1.24-1.33 g: 0.7-0.84 g: 0.013-0.021 g.

3. The highly wear-resistant polyurethane packaging material for electronic products according to claim 1, characterized in that: The mass ratio of amination adamantane, pyridine catalyst and 4-vinylbenzoyl chloride in S2 is 1g:0.014-0.023g:2.36-2.58g.

4. The highly wear-resistant polyurethane packaging material for electronic products according to claim 1, characterized in that: The reaction time in S2 is 5-7h.

5. The highly wear-resistant polyurethane packaging material for electronic products according to claim 1, characterized in that: The mass ratio of olefinated adamantane, mercaptoethylamine and benzoin dimethyl ether photoinitiator in S3 is 1.26-1.35g:3.1-3.32g:0.026-0.028g.

6. The highly wear-resistant polyurethane packaging material for electronic products according to claim 1, characterized in that: The mass ratio of polytetrahydrofuran diol, hexamethylene diisocyanate, dibutyltin dilaurate catalyst and adamantyl chain extender in S4 is 1.33-1.5g: 0.82-0.9g: 0.02-0.024g: 0.3-0.5g.

7. The highly wear-resistant polyurethane packaging material for electronic products according to claim 1, characterized in that: The preparation method of the sodium sulfonate modified adamantane comprises: adding 1.4-1.6 g of adamantyl chain extender and 1.34-1.53 ​​g of propenyl-1,3-sultone into tetrahydrofuran solvent for dissolution, then dripping 3-5 mL of a sodium hydroxide solution with a mass fraction of 2-4%, reacting at 60-66° C. for 5-7 hours, concentrating under reduced pressure to remove the solvent after the reaction, and washing to obtain the sodium sulfonate modified adamantane.

8. A method for preparing a highly wear-resistant polyurethane packaging material for electronic products as claimed in any one of claims 1 to 7, characterized in that: The preparation method of the highly wear-resistant polyurethane packaging material comprises the following steps: mixing sulfur-modified polyurethane, sodium sulfonate-modified adamantane, antioxidant 245 and silicon carbide, adding water thereto, stirring and foaming at a stirring speed of 1000-1100 r / min, injecting the foamed mixture into a mold, and ripening and forming the mixture to obtain the highly wear-resistant polyurethane packaging material.