High abrasion resistant polyurethane packaging material for electronic products and method for preparing the same

Abstract

The application 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, which is prepared by the following steps: stirring and mixing sulfur-containing modified polyurethane, sodium sulfonate modified adamantane, antioxidant 245 and silicon carbide, then adding water, stirring and foaming, wherein the stirring speed is 1000-1100 r / min, pouring the foamed mixture into a mold, and curing and forming to obtain the high-wear-resistance polyurethane packaging material. The high-wear-resistance polyurethane packaging material has good flame-retardant and wear-resistant effects.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of polyurethane packaging materials, in particular to a high-wear-resistance polyurethane packaging material for electronic products and a preparation method thereof. BACKGROUND

[0002] With the wide application of electronic products in today's society, the requirements for electronic product packaging materials are also increasing. Traditional packaging materials have shortcomings in wear resistance, which can easily lead to wear during storage and use, thereby affecting normal use. Therefore, it is of great significance to develop an electronic product packaging material with high wear resistance and environmental protection. A kind of flame-retardant polyurethane material and its preparation method are disclosed in Chinese patent application publication No. CN115873206B. The polyurethane material of the invention has good flame retardance and is green and environmentally friendly, but its wear resistance has not been improved. SUMMARY

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

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

[0005] A high-wear-resistance polyurethane packaging material for electronic products 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.

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

[0007] S1. 1,3,5-trihydroxyadamantane and 4-aminobenzeneboronic acid are added to a tetrahydrofuran solvent, stirred and mixed, anhydrous magnesium sulfate is continuously added, the temperature is raised to 50-65℃, and stirring is carried out at 300-350r / min for 4-6h, and vacuum drying is carried out to obtain aminated adamantane;

[0008] S2. Aminated adamantane and a pyridine catalyst are added to an N,N-dimethylformamide solvent, stirred and dissolved, 4-vinylbenzoyl chloride is continuously added, and reaction is carried out at 30-40℃, after the end, the solution is concentrated, washed, and aminated adamantane is obtained;

[0009] S3. The aminated adamantane is added to an N,N-dimethylformamide solvent, stirred and dispersed, mercaptoethylamine and benzoin dimethyl ether photoinitiator are added, and irradiation is carried out under 365nm ultraviolet light at 25-40℃ for 2-5h, after the end, centrifugal separation is carried out, and the product is washed and dried to obtain an adamantyl chain extender.

[0010] S4. After the polytetrahydrofuran diol is dehydrated, it is mixed with hexamethylene diisocyanate, nitrogen is introduced, and then dibutyl tin dilaurate catalyst is added dropwise, and the pre-polymerization is carried out at 60-75℃ for 2-5h, then adamantyl chain extender is added, and the chain extension reaction is continued at 50-60℃ for 4-6h, after the reaction is completed, it is cooled, discharged, and the sulfur-modified polyurethane is obtained.

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

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

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

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

[0015] Further, the mass ratio of polytetrahydrofuran diol, hexamethylene diisocyanate, dibutyl tin 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] Further, the preparation method of the sodium sulfonate modified adamantane is: 1.4-1.6g of adamantyl chain extender and 1.34-1.53g of propenyl-1,3-sulfonyl lactone are dissolved in tetrahydrofuran solvent, then 3-5mL of 2-4% mass fraction sodium hydroxide solution is added dropwise, and the reaction is carried out at 60-66℃ for 5-7h, after the reaction, the solvent is removed by reduced pressure concentration, and the sodium sulfonate modified adamantane is obtained after washing.

[0017] In the above reaction process, the amino group in the adamantyl chain extender and the propenyl-1,3-sulfonyl lactone are reacted to generate a sodium sulfonate group, thereby obtaining the sodium sulfonate modified adamantane.

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

[0019] In the above reaction process, the hydroxyl group in the 1,3,5-trihydroxyadamantane and the boronic acid group in the 4-aminobenzeneboronic acid are subjected to esterification reaction, and the amino group is introduced, then the acyl chloride in the 4-vinylbenzoyl chloride is reacted, and the alkenyl group is introduced, then the thiol group in the mercaptoethylamine is subjected to click reaction, and the amine group is introduced, so that the adamantyl chain extender is obtained; the polytetrahydrofuran diol is dehydrated, mixed with hexamethylene diisocyanate, then the dibutyltin dilaurate catalyst is added dropwise, and the pre-polymerization is carried out, then the adamantyl chain extender is added, so that the sulfur-containing modified polyurethane is obtained.

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

[0021] The present application obtains the high wear-resistant polyurethane packaging material by stirring and mixing the sulfur-containing modified polyurethane, the sodium sulfonate modified adamantane, the antioxidant 245 and the silicon carbide, then adding water to the mixture, stirring and foaming, injecting the foamed mixture into a mold, and curing and forming the mixture.

[0022] 1. The sulfur element and the boron element contained in the sulfur-containing modified polyurethane, and the sodium sulfonate group in the sodium sulfonate modified adamantane all have good flame retardant effect. The silicon element can produce a glass-like substance on the surface of the material when heated, which can isolate material transportation and energy transmission, and has the effect of flame retardation. The sodium sulfonate group can promote the release of carbon dioxide and water during combustion, which helps to improve the flame retardant effect. The boron element melts at high temperature to form a glassy covering layer on the surface of the burning material, which can isolate oxygen and heat, and has the effect of flame retardation.

[0023] 2. The chains in the sulfur-containing modified polyurethane can crosslink with the molecular chains of the sodium sulfonate modified adamantane, which enhances the connection and interaction between molecules, makes the material more compact, and can better resist external force, and has good friction effect. The adamantane group in the polyurethane and the sodium sulfonate modified adamantane has good rigidity, and also has good wear resistance. DETAILED DESCRIPTION

[0024] With reference to the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0025] Embodiment 1

[0026] S1. 1.24 g of 1,3,5-trihydroxyadamantane, 0.7 g of 4-aminobenzoic acid were added to 35 mL of tetrahydrofuran solvent, the mixture was stirred, 0.013 g of anhydrous magnesium sulfate was continuously added, the temperature was raised to 50 DEG C, and the reaction was stirred at 300 r / min for 4 h, and then vacuum dried to obtain aminated adamantane;

[0027] S2. 1 g of aminated adamantane and 0.014 g of pyridine catalyst were added to 40 mL of N,N-dimethylformamide solvent, after stirring and dissolving, 2.36 g of 4-vinylbenzoyl chloride was continuously added, and the reaction was carried out at 30 DEG C for 5 h, after the reaction was completed, the solution was concentrated, washed, and aminated adamantane was obtained;

[0028] S3. 1.26 g of aminated adamantane was added to 35 mL of N,N-dimethylformamide solvent, and stirred and dispersed, then 3.1 g of mercaptoethylamine and 0.026 g of benzoin dimethyl ether photoinitiator were added, and the reaction was carried out under 365 nm ultraviolet light at 25 DEG C for 2 h, after the reaction was completed, centrifugal separation, washing and drying were carried out, and adamantyl chain extender was obtained;

[0029] S4. 1.33 g of polytetrahydrofuran diol was mixed with 0.82 g of hexamethylene diisocyanate after water removal, nitrogen was introduced, and then 0.02 g of dibutyl tin dilaurylate catalyst was added dropwise, and the pre-polymerization was carried out at 60 DEG C for 2 h, then 0.3 g of adamantyl chain extender was added, and the chain extension reaction was carried out at 50 DEG C for 4 h, after the reaction was completed, the reaction was cooled, discharged, and sulfur-containing modified polyurethane was obtained;

[0030] S5. 1.4 g of adamantyl chain extender and 1.34 g of propenyl-1,3-sulfonic acid lactone were dissolved in 40 mL of tetrahydrofuran solvent, then 3 mL of 2% sodium hydroxide solution was added dropwise, and the reaction was carried out at 60 DEG C for 5 h, after the reaction, the solvent was removed by reduced pressure concentration, and washing was carried out, and sodium sulfonate modified adamantane was obtained;

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

[0032] Example 2

[0033] S1. 1.33 g of 1,3,5-trihydroxyadamantane, 0.84 g of 4-aminobenzoic acid is added to 45 mL of tetrahydrofuran solvent, stirred and mixed, 0.021 g of anhydrous magnesium sulfate is continuously added, heated to 65℃, stirred at 350 r / min for 6 h, and vacuum dried to obtain aminated adamantane;

[0034] S2. 1 g of aminated adamantane and 0.023 g of pyridine catalyst are added to 50 mL of N,N-dimethylformamide solvent, stirred and dissolved, then 2.58 g of 4-vinylbenzoyl chloride is continuously added, and reacted at 40℃ for 7 h. After the reaction is completed, the solution is concentrated, washed, and aminated adamantane is obtained;

[0035] S3. 1.35 g of aminated adamantane is added to 46 mL of N,N-dimethylformamide solvent, stirred and dispersed, then 3.32 g of mercaptoethylamine and 0.028 g of benzoin dimethyl ether photoinitiator are added, and irradiated with ultraviolet light at 365 nm at 40℃ for 5 h. After the reaction is completed, centrifugal separation, washing and drying are carried out to obtain an adamantyl chain extender;

[0036] S4. 1.5 g of polytetrahydrofuran diol is dehydrated and mixed with 0.9 g of hexamethylene diisocyanate, nitrogen is introduced, then 0.024 g of dibutyltin dilaurate catalyst is added dropwise, and pre-polymerization is carried out at 75℃ for 5 h. Then 0.5 g of adamantyl chain extender is added, and chain extension reaction is carried out at 60℃ for 6 h. After the reaction is completed, cooling and discharging are carried out to obtain sulfur-containing modified polyurethane;

[0037] S5. 1.6 g of adamantyl chain extender and 1.53 g of propenyl-1,3-sulfonic acid lactone are dissolved in 55 mL of tetrahydrofuran solvent, then 5 mL of 4% mass fraction sodium hydroxide solution is added dropwise, and reacted at 66℃ for 7 h. After the reaction, the solvent is removed by reduced pressure concentration, and washed to obtain sodium sulfonate modified adamantane;

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

[0039] Example 3

[0040] S1. 1.31 g of 1,3,5-trihydroxyadamantane, 0.81 g of 4-aminobenzoic acid is added to 40 mL of tetrahydrofuran solvent, stirred and mixed, 0.017 g of anhydrous magnesium sulfate is continuously added, heated to 55°C, stirred at 320 r / min for 5 h, and vacuum dried to obtain aminated adamantane;

[0041] S2. 1 g of aminated adamantane and 0.018 g of pyridine catalyst are added to 45 mL of N,N-dimethylformamide solvent, stirred and dissolved, then 2.46 g of 4-vinylbenzoyl chloride is continuously added, reacted at 35°C for 6 h, and after the reaction is completed, the solution is concentrated, washed, and aminated adamantane is obtained;

[0042] S3. 1.29 g of aminated adamantane is added to 42 mL of N,N-dimethylformamide solvent, stirred and dispersed, then 3.25 g of mercaptoethylamine and 0.027 g of benzoin dimethyl ether photoinitiator are added, and irradiated with ultraviolet light at 365 nm at 30°C for 4 h, and after the reaction is completed, centrifugal separation, washing and drying are carried out to obtain an adamantyl chain extender;

[0043] S4. 1.43 g of polytetrahydrofuran diol is dried and mixed with 0.85 g of hexamethylene diisocyanate, nitrogen is introduced, then 0.022 g of dibutyltin dilaurate catalyst is added dropwise, and pre-polymerization is carried out at 73°C for 3 h, then 0.4 g of adamantyl chain extender is added, and chain extension reaction is carried out at 55°C for 5 h, after the reaction is completed, cooling, and discharging to obtain sulfur-containing modified polyurethane;

[0044] S5. 1.5 g of adamantyl chain extender and 1.47 g of propenyl-1,3-sulfonic acid lactone are dissolved in 52 mL of tetrahydrofuran solvent, then 4 mL of 3% sodium hydroxide solution is added dropwise, and reacted at 63°C for 6 h, after the reaction, the solvent is removed by reduced pressure concentration, and washed to obtain sodium sulfonate modified adamantane;

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

[0046] Example 4

[0047] S1. 1.24 g of 1,3,5-trihydroxyadamantane, 0.7 g of 4-aminobenzoic acid are added to 35 mL of tetrahydrofuran solvent, stirred and mixed, 0.013 g of anhydrous magnesium sulfate is continuously added, heated to 50°C, and stirred at 300 r / min for 4 h, and vacuum dried to obtain aminated adamantane;

[0048] S2. 1 g of aminated adamantane and 0.014 g of pyridine catalyst are added to 40 mL of N,N-dimethylformamide solvent, stirred and dissolved, then 2.36 g of 4-vinylbenzoyl chloride is continuously added, reacted at 30°C for 5 h, and after the reaction is completed, the solution is concentrated, washed, and aminated adamantane is obtained;

[0049] S3. 1.35 g of aminated adamantane is added to 46 mL of N,N-dimethylformamide solvent, stirred and dispersed, then 3.32 g of mercaptoethylamine and 0.028 g of benzoin dimethyl ether photoinitiator are added, irradiated with ultraviolet light of 365 nm at 40°C for 5 h, and after the reaction is completed, centrifugal separation, washing and drying are carried out to obtain an adamantyl chain extender;

[0050] S4. 1.5 g of polytetrahydrofuran diol is dehydrated and mixed with 0.9 g of hexamethylene diisocyanate, nitrogen is introduced, then 0.024 g of dibutyltin dilaurate catalyst is added dropwise, pre-polymerization is carried out at 75°C for 5 h, then 0.5 g of adamantyl chain extender is added, chain extension reaction is continued, and the reaction is carried out at 60°C for 6 h, after the reaction is completed, the product is cooled, discharged, and a sulfur-containing modified polyurethane is obtained;

[0051] S5. 1.5 g of adamantyl chain extender and 1.47 g of propenyl-1,3-sulfonic acid lactone are dissolved in 52 mL of tetrahydrofuran solvent, then 4 mL of 3% sodium hydroxide solution is added dropwise, and the reaction is carried out at 63°C for 6 h, after the reaction, the solvent is removed by reduced pressure concentration, and washing to obtain sodium sulfonate modified adamantane;

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

[0053] Example 5

[0054] S1. 1.33 g of 1,3,5-trihydroxyadamantane, 0.84 g of 4-aminobenzoic acid are added to 45 mL of tetrahydrofuran solvent, stirred and mixed, 0.021 g of anhydrous magnesium sulfate is continuously added, heated to 65°C, stirred at 350 r / min for 6 h, and vacuum dried to obtain aminated adamantane;

[0055] S2. 1 g of aminated adamantane and 0.023 g of pyridine catalyst are added to 50 mL of N,N-dimethylformamide solvent, stirred and dissolved, then 2.58 g of 4-vinylbenzoyl chloride is continuously added, reacted at 40°C for 7 h, and then the solution is concentrated, washed, and aminated adamantane is obtained;

[0056] S3. 1.29 g of aminated adamantane is added to 42 mL of N,N-dimethylformamide solvent, stirred and dispersed, then 3.25 g of mercaptoethylamine and 0.027 g of benzoin dimethyl ether photoinitiator are added, irradiated with 365 nm ultraviolet light at 30°C for 4 h, then centrifuged, washed and dried to obtain adamantane-based chain extender;

[0057] S4. 1.43 g of polytetrahydrofuran diol is dried and mixed with 0.85 g of hexamethylene diisocyanate, nitrogen is introduced, then 0.022 g of dibutyltin dilaurate catalyst is added dropwise, pre-polymerized at 73°C for 3 h, then 0.4 g of adamantane-based chain extender is added, and the chain extension reaction is continued, and the reaction is carried out at 55°C for 5 h, then cooled, discharged, and sulfur-containing modified polyurethane is obtained;

[0058] S5. 1.4 g of adamantane-based chain extender and 1.34 g of propenyl-1,3-sulfonic acid lactone are dissolved in 40 mL of tetrahydrofuran solvent, then 3 mL of 2% sodium hydroxide solution is added dropwise, and the reaction is carried out at 60°C for 5 h, then the solvent is removed by reduced pressure concentration after the reaction, and washed to obtain sodium sulfonate modified adamantane;

[0059] S6. Mix 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. Then add 2 parts by weight of water and stir to foam at a speed of 1000 r / min. Pour the foamed mixture into a mold and cure to obtain a high wear-resistant polyurethane packaging material.

[0060] Example 6

[0061] S1. 1.31 g of 1,3,5-trihydroxyadamantane and 0.81 g of 4-aminophenylboronic acid were added to 40 mL of tetrahydrofuran solvent, stirred and mixed, and 0.017 g of anhydrous magnesium sulfate was added. The mixture was heated to 55 °C and stirred at 320 r / min for 5 h. The mixture was then dried under vacuum to obtain aminoadamantane.

[0062] S2. Add 1 g of aminoadamantane and 0.018 g of pyridine catalyst to 45 mL of N,N-dimethylformamide solvent, stir to dissolve, and then add 2.46 g of 4-vinylbenzoyl chloride. React at 35 °C for 6 h. After the reaction is completed, concentrate the solution and wash to obtain alkenyladamantane.

[0063] S3. Add 1.26 g of alkenyl 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 after the irradiation, wash and dry to obtain adamantane chain extender;

[0064] S4. After removing water from 1.5g of polytetrahydrofuran glycol, mix it evenly with 0.9g of hexamethylene diisocyanate, purge with nitrogen, and then add 0.024g of dibutyltin dilaurate catalyst dropwise. React at 75℃ for 5h to carry out prepolymerization. Then add 0.5g of adamantyl alkyl chain extender, stir to continue the chain extension reaction, and react at 60℃ for 6h. After the reaction is completed, cool and discharge to obtain sulfur-modified polyurethane.

[0065] S5. Add 1.6 g of adamantyl chain extender and 1.53 g of propenyl-1,3-sulfonyl lactone to 55 mL of tetrahydrofuran solvent for dissolution, then add 5 mL of 4% sodium hydroxide solution dropwise, and react at 66 °C for 7 h. After the reaction, concentrate under reduced pressure to remove the solvent, wash, and obtain sodium sulfonate modified adamantyl.

[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, 4 parts by weight of silicon carbide were stirred and mixed, then 3 parts by weight of water was added thereto, and the mixture was stirred and foamed at a stirring speed of 1100 r / min. The foamed mixture was injected into a mold, and cured and formed to obtain a high wear-resistant polyurethane packaging material.

[0067] Comparative Example 1

[0068] The difference between this comparative example and Example 6 is that adamantane-based chain extender is used instead of sodium sulfonate-modified adamantane.

[0069] Comparative Example 2

[0070] The difference between this comparative example and Example 6 is that no adamantane-based chain extender is added in S4.

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

[0072] The limiting oxygen index of the material was tested using an oxygen index instrument according to the method described in the national standard GB / T 2406; and the combustion grade of the material was tested using a horizontal and vertical burning instrument.

[0073] Table 1: Flame retardancy test

[0074] Item Limiting oxygen index (%) Flame class 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 can be seen from Table 1, the flame retardant effect of Examples 1-6 is better than that of Comparative Examples 1-2, indicating that the high wear-resistant polyurethane packaging material prepared by the present application has good flame retardant effect. As can be seen from the results of Comparative Example 1, after using adamantane-based chain extender instead of sodium sulfonate-modified adamantane, the flame retardant performance of the obtained high wear-resistant polyurethane packaging material decreases. As can be seen from the results of Comparative Example 2, after no adamantane-based chain extender is added in S4, the flame retardant performance of the obtained high wear-resistant polyurethane packaging material decreases.

[0076] The high wear-resistant polyurethane packaging materials obtained in Examples 1-6 and Comparative Examples 1-2 above were subjected to wear resistance test in an abrasion tester, and the test was performed according to the method described in GB / T 26689, with the following specific parameter settings:

[0077] Speed: 72 RPM, grinding wheel: CS-10, load: 1 kg, number of rotations: 1000 times.

[0078] Table 2: Wear resistance test

[0079] Item Initial mass (g) Mass after abrasion (g) Amount of abrasion (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 abrasion loss of Examples 1-6 and Comparative Example 1 is less than that of Comparative Example 2, which indicates that the high abrasion resistant polyurethane packaging material prepared in the present application has good abrasion resistance. As shown in the results of Comparative Example 2, after not adding adamantyl chain extender in S4, the abrasion resistance of the obtained high abrasion resistant polyurethane packaging material decreases.

[0081] In the description of the specification, the description of the terms "one embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do 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 is only an example and description of the present application, and those skilled in the art can make various modifications or supplements to the described specific embodiments or replace them with similar ways, as long as they do not deviate from the invention or exceed the scope defined by the present claims, which shall belong to the protection scope of the present application.

Claims

1. A high-wear-resistant polyurethane packaging material for electronic products, characterized in that, It includes 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-modified polyurethane is as follows: 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℃, stir the reaction at 300-350r / min for 4-6h, and dry under vacuum to obtain aminoadamantane. S2. Add amino-modified adamantane and pyridine catalyst to N,N-dimethylformamide solvent, stir to dissolve, and then add 4-vinylbenzoyl chloride. React at 30-40℃. After the reaction is completed, concentrate the solution and wash to obtain alkenyl-modified adamantane. S3. Add alkenyl adamantane to N,N-dimethylformamide solvent, stir and disperse, then add mercaptoethylamine and benzoin dimethyl ether photoinitiator, irradiate with 365nm ultraviolet light at 25-40℃ for 2-5h, centrifuge, wash and dry to obtain adamantane chain extender; S4. After dehydrating polytetrahydrofuran glycol, mix it evenly with hexamethylene diisocyanate, purge with nitrogen, then add dibutyltin dilaurate catalyst dropwise, and react at 60-75℃ for 2-5 hours to carry out prepolymerization. Then add adamantyl alkyl chain extender, stir and continue the chain extension reaction at 50-60℃ for 4-6 hours. After the reaction is completed, cool and discharge the material to obtain sulfur-modified polyurethane. The method for preparing sodium sulfonate-modified adamantane is as follows: 1.4-1.6 g of adamantane chain extender and 1.34-1.53 ​​g of propenyl-1,3-sulfonyl lactone are added to a tetrahydrofuran solvent for dissolution. Then, 3-5 mL of a 2-4% sodium hydroxide solution is added dropwise. The reaction is carried out at 60-66℃ for 5-7 h. After the reaction, the solvent is removed by concentration under reduced pressure, and the mixture is washed to obtain sodium sulfonate-modified adamantane.

2. The high abrasion-resistant polyurethane packaging material for electronic products according to claim 1, characterized in that, The mass ratio of 1,3,5-trihydroxyadamantane, 4-aminophenylboronic 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 high abrasion-resistant polyurethane packaging material for electronic products according to claim 1, characterized in that, The mass ratio of aminoadamantane, pyridine catalyst, and 4-vinylbenzoyl chloride in S2 is 1g:0.014-0.023g:2.36-2.58g.

4. The high abrasion-resistant polyurethane packaging material for electronic products according to claim 1, characterized in that, The reaction time in S2 is 5-7 hours.

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

6. The high abrasion-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. A method for preparing a high abrasion-resistant polyurethane packaging material for electronic products as described in any one of claims 1-6, characterized in that, The preparation method of the high wear-resistant polyurethane packaging material is as follows: sulfur-modified polyurethane, sodium sulfonate-modified adamantane, antioxidant 245 and silicon carbide are stirred and mixed, then water is added, and the mixture is stirred and foamed at a speed of 1000-1100 r / min. The foamed mixture is then injected into a mold and cured to obtain the high wear-resistant polyurethane packaging material.