Corrosion-resistant gear shaft and surface treatment process thereof

Abstract

The present application relates to the technical field of mechanical parts manufacturing, in particular to a corrosion-resistant gear shaft and a surface treatment process thereof. The present application obtains vanillin diphenol by adding vanillin, tetrahydrofuran, deionized water and sodium percarbonate. The vanillin diphenol, a catalyst, potassium carbonate and acryloyl chloride are mixed to obtain vanillin diene. The vanillin diene, 2-amino-5-sulfhydryl-1,3,4-thiadiazole and photoinitiator 1173 are mixed to obtain vanillin diamine. Non-isocyanate polyurethane is obtained by taking vinyl carbonate, vanillin diamine and itaconic acid as main raw materials. Finally, the non-isocyanate polyurethane, condensed water, photoinitiator 651 and accelerant are mixed to obtain photocuring paint. The photocuring paint is coated on the surface of the gear shaft, and the finished product is obtained by ultraviolet curing. The finished product obtained by the present application has good corrosion resistance, antibacterial property and wear resistance, so it has a wide application prospect in the technical field of mechanical parts manufacturing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical parts manufacturing, and particularly relates to a corrosion-resistant gear shaft and a surface treatment process thereof. BACKGROUND

[0002] The gear shaft is an indispensable element in the mechanical transmission system, and has important and irreplaceable value in modern industrial production. The gear shaft realizes the normal operation of various mechanical equipment through the mode of power transmission and torque transmission, and is widely used in many fields, mainly embodied in: (1) as a core component for transmitting power, the gear shaft can transmit power of an engine or a motor to other mechanical components to realize the operation of mechanical equipment, and the gear shaft plays a crucial role in improving the working efficiency and stability of mechanical equipment. (2) In the automobile industry, the gear shaft is widely used in the gearbox and transmission system, and has important functions such as transmitting torque, providing transmission ratio, and realizing power output. In summary, the modern value of the gear shaft cannot be underestimated, and its continuous development and optimization not only relates to the development of the mechanical engineering field, but also relates to the progress and improvement of the entire industrial manufacturing. However, since the gear shaft is often in a harsh environment of contact with moisture and corrosive medium, it is easily affected by corrosion, resulting in surface damage and material fatigue. In addition, in a humid or high-temperature environment, microorganisms can form bacteria or fungi on the surface of the gear shaft, accelerating corrosion and oxidation, thereby affecting the performance and stability of the gear shaft. At the same time, when the gear shaft is under high load or high-speed operation, long-time friction and wear will cause gear surface wear, deformation or fracture, thereby reducing transmission efficiency, increasing noise and vibration.

[0003] In order to overcome the defects of the prior art, the present application provides a corrosion-resistant gear shaft and a surface treatment process thereof. SUMMARY

[0004] The purpose of the present application is to provide a corrosion-resistant gear shaft and a surface treatment process thereof to solve the problems in the prior art.

[0005] In order to solve the above technical problems, the present application provides the following technical scheme:

[0006] A surface treatment process of a corrosion-resistant gear shaft, comprising the following steps:

[0007] Step one: dissolve vanillin in tetrahydrofuran, then add deionized water and sodium percarbonate in sequence, and react at 25-30 DEG C for 4-5 h, then neutralize with hydrochloric acid, rotary evaporate, extract, wash, dry, and obtain vanillin diphenol; dissolve the vanillin diphenol in acetone, then add catalyst, potassium carbonate and acryloyl chloride in sequence, and reflux at 65-75 DEG C for 45-55 h, then dissolve with water, extract, wash, dry, rotary evaporate, and separate and purify to obtain vanillin diene;

[0008] Step two: dissolve vanillin diene, 2-amino-5-mercapto-1, 3, 4-thiadiazole and photoinitiator 1173 in dichloromethane, and react under the condition of ultraviolet light irradiation at 25-28℃ for 15-18h, after the reaction is completed, wash, dry, rotary evaporation to obtain vanillin diamine; mix ethylene carbonate, vanillin diamine and acetone, stir well, react at 30-40℃ for 12-18h, after the reaction is completed, filter, grind, dry to obtain non-isocyanate polyurethane monomer;

[0009] Step three: mix itaconic acid, non-isocyanate polyurethane monomer, catalyst, polymerization inhibitor, silane coupling agent under nitrogen environment, heat to 120-130℃ and react for 1-2h, then vacuum the system to-0.1-0kPa, continue to react for 3-5h, then add dibutyltin dilaurate, and react at 160-170℃, 0.09-0.10MPa for 4-8h, after the reaction is completed, cool to obtain non-isocyanate polyurethane;

[0010] Step four: mix non-isocyanate polyurethane and condensed water under nitrogen environment, mechanically stir at 80-90℃ for 60-70min to obtain non-isocyanate polyurethane emulsion, then add photoinitiator 651 and accelerator, stir well to obtain photocuring coating; sequentially perform surface water washing and alcohol washing on the surface of the gear shaft, after the cleaning is completed, coat the photocuring coating on the surface of the gear shaft, and photocure under the condition of ultraviolet light irradiation for 10-15min to obtain the finished product.

[0011] More preferably, in step one, the content of each component of vanillin diphenol is: 5-7 parts of vanillin, 60-70 parts of tetrahydrofuran, 50-55 parts of deionized water, and 12-15 parts of sodium percarbonate.

[0012] More preferably, in step one, when preparing vanillin diene, the reaction molar ratio of vanillin diphenol and acryloyl chloride is 1:(2-2.5); the catalyst is tetrabutylammonium bromide.

[0013] More preferably, in step two, when preparing vanillin diamine, the reaction molar ratio of vanillin diene and 2-amino-5-mercapto-1, 3, 4-thiadiazole is 1:(3-4).

[0014] More preferably, in step two, when preparing non-isocyanate polyurethane monomer, the reaction molar ratio of ethylene carbonate and vanillin diamine is(2.2-2.5):1.

[0015] More preferably, in step three, the non-isocyanate polyurethane component content is: 15-18 parts by mass of itaconic acid, 47-55 parts by mass of non-isocyanate polyurethane monomer, 0.11-0.13 parts by mass of catalyst, 0.3-0.5 parts by mass of polymerization inhibitor, 0.3-0.5 parts by mass of silane coupling agent, and 0.3-0.5 parts by mass of dibutyltin dilaurate.

[0016] More preferably, the catalyst is p-toluenesulfonic acid monohydrate; the polymerization inhibitor is hydroquinone; and the silane coupling agent is vinyltriethoxysilane.

[0017] More preferably, in step four, the light-cured coating component content is: 20-30 parts by mass of non-isocyanate polyurethane, 25-30 parts by mass of condensed water, 0.6-0.8 parts by mass of photoinitiator 651, and 0.4-0.5 parts by mass of accelerator; the accelerator is triethanolamine.

[0018] More preferably, in steps two and four, the power of the ultraviolet light lamp is 500-520 W.

[0019] More preferably, in step four, the finished product coating thickness is 0.5-0.7 mm.

[0020] Advantages of the present application:

[0021] The present application adds vanillin, tetrahydrofuran, deionized water, and sodium percarbonate to prepare vanillin diphenol. Vanillin diphenol, catalyst, potassium carbonate, and acryloyl chloride are mixed to prepare vanillin diene. Vanillin diene, 2-amino-5-mercapto-1,3,4-thiadiazole, and photoinitiator 1173 are mixed to prepare vanillin diamine. Non-isocyanate polyurethane monomer is prepared using ethylene carbonate, vanillin diamine, and acetone as raw materials. Itaconic acid, non-isocyanate polyurethane monomer, catalyst, polymerization inhibitor, silane coupling agent, and dibutyltin dilaurate are mixed to obtain non-isocyanate polyurethane. Finally, light-cured coating is prepared using non-isocyanate polyurethane, condensed water, photoinitiator 651, and accelerator as raw materials. The light-cured coating is applied to the surface of the gear shaft, and the finished product is obtained after ultraviolet curing.

[0022] The application is characterized in that, in step one, vanillin diphenol is prepared by adding vanillin, tetrahydrofuran, deionized water and sodium percarbonate. Vanillin diphenol, a catalyst, potassium carbonate and acryloyl chloride are mixed to prepare vanillin diene. The reaction principle of step one is that vanillin loses one carbon atom through Darkin reaction to obtain vanillin-based diphenol, and then the vanillin diphenol undergoes allylation reaction under the catalysis of a catalyst to obtain vanillin diene. In step two, vanillin diene, 2-amino-5-mercapto-1,3,4-thiadiazole and photoinitiator 1173 are mixed to prepare vanillin diamine. Non-isocyanate polyurethane monomer is prepared by using ethylene carbonate, vanillin diamine and acetone as raw materials. The reaction principle of step two is that vanillin diene and 2-amino-5-mercapto-1,3,4-thiadiazole undergo thiol-ene click reaction under the action of photoinitiator 1173 to obtain vanillin diamine; vanillin diamine and ethylene carbonate undergo addition reaction to prepare non-isocyanate polyurethane monomer. The above steps use cheap and easily available renewable resources vanillin as starting material, and the non-isocyanate polyurethane material prepared based on renewable resources vanillin not only has environmental protection, but also can provide a new idea and possibility for the development of green materials to replace traditional petrochemical raw materials. In addition, the traditional synthesis of polyurethane usually needs isocyanate substances, however, the synthesis process of such substances usually involves a highly toxic phosgene reaction, which has a serious threat to human health. However, in the preparation process of non-isocyanate polyurethane monomer, isocyanate substances are not usually used, the raw materials are produced in a green way and the production process has less by-products, at the same time, the two side hydroxyl groups of non-isocyanate polyurethane monomer have strong chemical reactivity, so various performance reaction groups can be introduced to improve the performance of polyurethane.

[0023] In the third and fourth steps, itaconic acid, non-isocyanate polyurethane monomer, catalyst, polymerization inhibitor, silane coupling agent and dibutyltin dilaurate are mixed to obtain non-isocyanate polyurethane. Then, the non-isocyanate polyurethane, condensed water, photoinitiator 651 and accelerator are mixed to prepare a photocuring coating. The itaconic acid and non-isocyanate polyurethane monomer are subjected to polyester polycondensation to obtain non-isocyanate polyurethane. On the one hand, the non-isocyanate polyurethane is prepared through the continuous reaction of the first, second and third steps, and the non-isocyanate polyurethane contains a certain amount of antibacterial element sulfur. Therefore, the photocuring coating containing the antibacterial element sulfur is coated on the surface of the gear shaft to form an antibacterial protective film on the surface of the gear shaft, so as to inhibit the growth of bacteria, fungi and other microorganisms and thus maintain the cleanliness and hygiene of the surface of the gear shaft. In addition, the presence of the antibacterial element sulfur can help improve the corrosion resistance of the coating and reduce the corrosion and damage of the surface of the gear shaft caused by bacterial erosion. On the other hand, the non-isocyanate polyurethane has a relatively dense molecular structure and good chemical inertness, and has a certain resistance to acid and alkali media. Therefore, the photocuring coating prepared by taking the non-isocyanate polyurethane as the main resin is coated on the surface of the gear shaft to effectively prevent the corrosion medium from eroding the surface of the gear shaft. In addition, the non-isocyanate polyurethane has certain elasticity and toughness, can reduce friction loss during the operation of the gear, has high wear resistance and can protect the surface of the gear shaft from wear. DETAILED DESCRIPTION

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

[0025] Raw material sources:

[0026] The gear shaft was provided by Renqiu Renyan Machinery Parts Co., Ltd. and the model was 5521. The polyurethane resin was provided by Anhui Mingyi Silicon Industry Co., Ltd. and the model was MY8815. One part was 1 g in terms of mass fraction.

[0027] Example 1: Step 1: 5 g of vanillin was dissolved in 60 g of tetrahydrofuran, and then 50 g of deionized water and 12 g of sodium percarbonate were added in sequence, and the reaction was carried out at 30℃ for 5 h. After the reaction was completed, neutralization was carried out with hydrochloric acid, rotary evaporation was carried out, extraction was carried out, washing was carried out, drying was carried out, and vanillin diphenol was obtained. 0.1 mol of vanillin diphenol was dissolved in acetone, and then 2.5 g of tetrabutylammonium bromide, 14 g of potassium carbonate and 0.23 mol of acryloyl chloride were added in sequence, and the reaction was carried out at 75℃ for 55 h. After the reaction was completed, water was added for dissolution, extraction was carried out, washing was carried out, drying was carried out, rotary evaporation was carried out, and vanillin diene was obtained through separation and purification.

[0028] Step two: 1 mol of vanillin diene, 3 mol of 2-amino-5-mercapto-1,3,4-thiadiazole and 0.02 mol of photoinitiator 1173 were dissolved in dichloromethane, and reacted at 28°C under the condition of 520W ultraviolet light for 18h. After the reaction was completed, washing, drying and rotary evaporation were performed to obtain vanillin diamine. 2.3 mol of ethylene carbonate, 1 mol of vanillin diamine and acetone were mixed, and fully stirred. The reaction was carried out at 40°C for 18h. After the reaction was completed, suction filtration, grinding and drying were performed to obtain a non-isocyanate polyurethane monomer;

[0029] Step three: 15g of itaconic acid, 47g of non-isocyanate polyurethane monomer, 0.11g of p-toluenesulfonic acid monohydrate, 0.3g of hydroquinone and 0.3g of vinyltriethoxysilane were mixed, and the temperature was raised to 130°C for reaction for 2h. The system was then vacuumized to 0kPa, and the reaction was continued for 5h. Then, 0.3g of dibutyltin dilaurate was added, and the reaction was carried out at 170°C and 0.10MPa for 8h. After the reaction was completed, cooling was performed to obtain a non-isocyanate polyurethane.

[0030] Step four: 20g of non-isocyanate polyurethane and 25g of condensed water were mixed under a nitrogen environment, and mechanical stirring was carried out at 90°C for 70min to obtain a non-isocyanate polyurethane emulsion. Then, 0.6g of photoinitiator 651 and 0.4g of triethanolamine were added, and fully stirred to obtain a photocuring coating. The surface of the gear shaft was sequentially subjected to surface water washing and alcohol washing. After the cleaning was completed, the photocuring coating was coated on the surface of the gear shaft, and photocuring was carried out under the condition of 520W ultraviolet light for 15min to prepare a finished product with a coating thickness of 0.7mm.

[0031] Example 2: Step one: 5g of vanillin was dissolved in 60g of tetrahydrofuran, and then 50g of deionized water and 12g of sodium percarbonate were sequentially added. The reaction was carried out at 28°C for 4.7h. After the reaction was completed, neutralization with hydrochloric acid, rotary evaporation, extraction, washing and drying were performed to obtain vanillin diphenol. 0.1mol of vanillin diphenol was dissolved in acetone, and then 2.5g of tetrabutylammonium bromide, 14g of potassium carbonate and 0.23mol of acryloyl chloride were sequentially added. The reaction was carried out at 70°C under reflux for 52h. After the reaction was completed, water dissolution, extraction, washing, drying, rotary evaporation and separation and purification were performed to obtain vanillin diene.

[0032] Step two: 1 mol of vanillin diene, 3 mol of 2-amino-5-mercapto-1,3,4-thiadiazole and 0.02 mol of photoinitiator 1173 were dissolved in dichloromethane, and reacted under the condition of 520 W ultraviolet light irradiation at 27℃ for 17.5 h. After the reaction was completed, washing, drying and rotary evaporation were performed to obtain vanillin diamine. 2.3 mol of ethylene carbonate, 1 mol of vanillin diamine and acetone were mixed, and fully stirred. Reaction was carried out at 37℃ for 16 h. After the reaction was completed, suction filtration, grinding and drying were performed to obtain a non-isocyanate polyurethane monomer;

[0033] Step three: 15 g of itaconic acid, 47 g of non-isocyanate polyurethane monomer, 0.11 g of p-toluenesulfonic acid monohydrate, 0.3 g of hydroquinone and 0.3 g of vinyltriethoxysilane were mixed, and the temperature was raised to 127℃ for reaction for 1.7 h. Then the system was vacuumized to-0.05 kPa, and the reaction was continued for 4.5 h. Then 0.3 g of dibutyltin dilaurate was added, and the reaction was carried out at 167℃ and 0.095 MPa for 7 h. After the reaction was completed, cooling was performed to obtain a non-isocyanate polyurethane.

[0034] Step four: 20 g of non-isocyanate polyurethane and 25 g of condensed water were mixed under nitrogen environment, and mechanical stirring was carried out at 87℃ for 67 min to obtain a non-isocyanate polyurethane emulsion. Then 0.6 g of photoinitiator 651 and 0.4 g of triethanolamine were added, and fully stirred to obtain a photocuring coating. The surface of the gear shaft was sequentially subjected to surface water washing and alcohol washing. After the cleaning was completed, the photocuring coating was coated on the surface of the gear shaft, and photocuring was carried out under the condition of 520 W ultraviolet light irradiation for 14 min to prepare a finished product with a coating thickness of 0.65 mm.

[0035] Example 3: Step one: 5 g of vanillin was dissolved in 60 g of tetrahydrofuran, and then 50 g of deionized water and 12 g of sodium percarbonate were sequentially added. Reaction was carried out at 27℃ for 4.5 h. After the reaction was completed, neutralization with hydrochloric acid, rotary evaporation, extraction, washing and drying were performed to obtain vanillin diphenol. 0.1 mol of vanillin diphenol was dissolved in acetone, and then 2.5 g of tetrabutylammonium bromide, 14 g of potassium carbonate and 0.23 mol of acryloyl chloride were sequentially added. Reaction was carried out at 70℃ for 50 h. After the reaction was completed, water dissolution, extraction, washing, drying, rotary evaporation and separation and purification were performed to obtain vanillin diene.

[0036] Step two: 1 mol of vanillin diene, 3 mol of 2-amino-5-mercapto-1,3,4-thiadiazole and 0.02 mol of photoinitiator 1173 were dissolved in dichloromethane, and reacted under the condition of 520 W ultraviolet light irradiation at 27℃ for 17 h. After the reaction was completed, washing, drying and rotary evaporation were performed to obtain vanillin diamine. 2.3 mol of ethylene carbonate, 1 mol of vanillin diamine and acetone were mixed, and fully stirred. Reaction was carried out at 35℃ for 14 h. After the reaction was completed, suction filtration, grinding and drying were performed to obtain a non-isocyanate polyurethane monomer;

[0037] Step three: 15 g of itaconic acid, 47 g of non-isocyanate polyurethane monomer, 0.11 g of p-toluenesulfonic acid monohydrate, 0.3 g of hydroquinone, 0.3 g of vinyl triethoxysilane were mixed, and the temperature was raised to 125℃ for reaction for 1.5 h. The system was then vacuumed to-0.05 kPa, and the reaction was continued for 4 h. Then 0.3 g of dibutyltin dilaurate was added, and the reaction was carried out at 165℃ and 0.095 MPa for 6 h. After the reaction was completed, cooling was performed to obtain a non-isocyanate polyurethane.

[0038] Step four: 20 g of non-isocyanate polyurethane and 25 g of condensed water were mixed under a nitrogen environment, and mechanical stirring was carried out at 85℃ for 65 min to obtain a non-isocyanate polyurethane emulsion. Then 0.6 g of photoinitiator 651 and 0.4 g of triethanolamine were added, and fully stirred to obtain a photocurable coating. The surface of the gear shaft was sequentially washed with water and alcohol. After the cleaning was completed, the photocurable coating was coated on the surface of the gear shaft, and photocuring was carried out under the condition of 520 W ultraviolet light irradiation for 13 min to prepare a finished product with a coating thickness of 0.6 mm.

[0039] Example 4: Step one: 5 g of vanillin was dissolved in 60 g of tetrahydrofuran, and then 50 g of deionized water and 12 g of sodium percarbonate were sequentially added. Reaction was carried out at 26℃ for 4.3 h. After the reaction was completed, neutralization with hydrochloric acid, rotary evaporation, extraction, washing and drying were performed to obtain vanillin diphenol. 0.1 mol of vanillin diphenol was dissolved in acetone, and then 2.5 g of tetrabutylammonium bromide, 14 g of potassium carbonate and 0.23 mol of acryloyl chloride were sequentially added. Reaction was carried out at 67℃ under reflux for 47 h. After the reaction was completed, water dissolution, extraction, washing, drying, rotary evaporation and separation and purification were performed to obtain vanillin diene.

[0040] Step two: 1 mol of vanillin diene, 3 mol of 2-amino-5-mercapto-1,3,4-thiadiazole and 0.02 mol of photoinitiator 1173 were dissolved in dichloromethane, and reacted under the condition of 520 W ultraviolet light irradiation at 26℃ for 16 h. After the reaction was completed, washing, drying and rotary evaporation were performed to obtain vanillin diamine. 2.3 mol of ethylene carbonate, 1 mol of vanillin diamine and acetone were mixed, and fully stirred to react at 33℃ for 13 h. After the reaction was completed, suction filtration, grinding and drying were performed to obtain a non-isocyanate polyurethane monomer;

[0041] Step three: 15 g of itaconic acid, 47 g of non-isocyanate polyurethane monomer, 0.11 g of p-toluenesulfonic acid monohydrate, 0.3 g of hydroquinone and 0.3 g of vinyltriethoxysilane were mixed, and heated to 123℃ to react for 1.3 h. Then the system was vacuumized to-0.1 kPa, and continued to react for 3.5 h. 0.3 g of dibutyltin dilaurate was added, and reacted at 163℃ and 0.09 MPa for 5 h. After the reaction was completed, cooling was performed to obtain a non-isocyanate polyurethane;

[0042] Step four: 20 g of non-isocyanate polyurethane and 25 g of condensed water were mixed under a nitrogen environment, and mechanically stirred at 83℃ for 63 min to obtain a non-isocyanate polyurethane emulsion. 0.6 g of photoinitiator 651 and 0.4 g of triethanolamine were added, and fully stirred to obtain a photocuring coating. The surface of the gear shaft was sequentially subjected to surface water washing and alcohol washing. After the cleaning was completed, the photocuring coating was coated on the surface of the gear shaft, and photocured under the condition of 520 W ultraviolet light irradiation for 11 min to prepare a finished product with a coating thickness of 0.55 mm.

[0043] Example 5: Step one: 5 g of vanillin was dissolved in 60 g of tetrahydrofuran, and then 50 g of deionized water and 12 g of sodium percarbonate were sequentially added. The reaction was carried out at 25℃ for 4 h. After the reaction was completed, neutralization with hydrochloric acid, rotary evaporation, extraction, washing and drying were performed to obtain vanillin diphenol. 0.1 mol of vanillin diphenol was dissolved in acetone, and then 2.5 g of tetrabutylammonium bromide, 14 g of potassium carbonate and 0.23 mol of acryloyl chloride were sequentially added. The reaction was carried out at 65℃ under reflux for 45 h. After the reaction was completed, water dissolution, extraction, washing, drying, rotary evaporation and separation and purification were performed to obtain vanillin diene;

[0044] Step two: 1 mol of vanillin diene, 3 mol of 2-amino-5-mercapto-1,3,4-thiadiazole and 0.02 mol of photoinitiator 1173 were dissolved in dichloromethane, and reacted at 25℃ under the condition of 520W ultraviolet light for 15h. After the reaction was completed, washing, drying and rotary evaporation were performed to obtain vanillin diamine. 2.3 mol of ethylene carbonate, 1 mol of vanillin diamine and acetone were mixed, fully stirred, and reacted at 30℃ for 12h. After the reaction was completed, suction filtration, grinding and drying were performed to obtain a non-isocyanate polyurethane monomer;

[0045] Step three: 15g of itaconic acid, 47g of non-isocyanate polyurethane monomer, 0.11g of p-toluenesulfonic acid monohydrate, 0.3g of hydroquinone, 0.3g of vinyl triethoxysilane were mixed under a nitrogen environment, and the temperature was raised to 120℃ for 1h. Then the system was vacuumized to-0.1kPa, and the reaction was continued for 3h. Then 0.3g of dibutyltin dilaurate was added, and the reaction was carried out at 160℃ and 0.09MPa for 4h. After the reaction was completed, cooling was performed to obtain a non-isocyanate polyurethane.

[0046] Step four: 20g of non-isocyanate polyurethane and 25g of condensed water were mixed under a nitrogen environment, and mechanical stirring was carried out at 80℃ for 60min to obtain a non-isocyanate polyurethane emulsion. Then 0.6g of photoinitiator 651 and 0.4g of triethanolamine were added, and fully stirred to obtain a photocuring coating. The surface of the gear shaft was sequentially subjected to surface water washing and alcohol washing. After the cleaning was completed, the photocuring coating was coated on the surface of the gear shaft, and photocuring was carried out under the condition of 520W ultraviolet light for 10min to prepare a finished product with a coating thickness of 0.5mm.

[0047] Comparative example 1: the non-isocyanate polyurethane was replaced by a polyurethane resin provided by Anhui Mingyi Silicon Industry Co., Ltd., and the rest was the same as example 1. The specific steps were as follows: step one: 20g of polyurethane resin and 25g of condensed water were mixed under a nitrogen environment, and mechanical stirring was carried out at 90℃ for 70min to obtain a non-isocyanate polyurethane emulsion. Then 0.6g of photoinitiator 651 and 0.4g of triethanolamine were added, and fully stirred to obtain a photocuring coating. The surface of the gear shaft was sequentially subjected to surface water washing and alcohol washing. After the cleaning was completed, the photocuring coating was coated on the surface of the gear shaft, and photocuring was carried out under the condition of 520W ultraviolet light for 15min to prepare a finished product with a coating thickness of 0.7mm.

[0048] Detection test:

[0049] Corrosion resistance test: according to the standard of GB / T 10125-2012, the finished product prepared by the present application was cut into a sample with a size of 15mm×7mm, and a 55g / L NaCI solution was prepared. The sample was placed in a test box for 50h salt spray test, and the mass loss was calculated after the test was completed.

[0050] Wear resistance test: the finished product prepared by the present application is cut into a sample with a size of 15 mm x 7 mm, and a MMW-1 vertical universal wear tester is used to test the wear amount, under an experimental load of 50 N and a rotating speed of 1200 r / min, for 30 min, and the wear amount is calculated by recording the weight before and after wear.

[0051] Antibacterial performance test: the photocuring coating prepared by the present application is prepared into a solution of 3 μg / mL using a phosphate buffer, 10 mL of inoculated Staphylococcus aureus solution is added, incubated at 28°C for 30 min, then diluted and inoculated into culture medium, incubated at 28°C for 20 h, and the number of bacterial colonies is observed and recorded to calculate the antibacterial rate. The results are as follows:

[0052] mass loss / (g / m 2 ) Wear amount / mg Antibacterial rate / % Example 1 25 0.9 96 Example 2 26 1.0 95 Example 3 27 1.0 94 Example 4 28 1.1 94 Example 5 29 1.2 93 Comparative Example 1 36 1.7 75

[0053] Conclusion: the dosage of examples 1-5 remains unchanged, only the reaction parameters are modified. According to the experimental data, the performance of the sample does not change significantly. Comparative example 1: the non-isocyanate polyurethane is replaced by a polyurethane resin provided by Anhui Mingyi Silicon Industry Co., Ltd., and the rest is the same as example 1. According to the experimental data, compared with example 1, the mass loss increases to 36 g / m 2 , the wear amount increases to 1.7 mg, and the antibacterial rate decreases to 75%. The analysis is as follows: the photocuring coating prepared by the present application contains a certain amount of antibacterial element sulfur, which can form an antibacterial protective film on the surface of the gear shaft to inhibit the growth of bacteria, fungi and other microorganisms. Therefore, after replacing the non-isocyanate polyurethane with the polyurethane resin provided by Anhui Mingyi Silicon Industry Co., Ltd., the antibacterial rate is significantly reduced. In addition, the photocuring coating of the present application is rapidly cross-linked by photocuring to form a dense surface protective film, so it has good corrosion resistance and wear resistance. Therefore, after replacing the non-isocyanate polyurethane with the polyurethane resin provided by Anhui Mingyi Silicon Industry Co., Ltd., the mass loss and wear amount will increase.

[0054] It should be noted that in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process method article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process method article or equipment.

[0055] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that the technical solutions described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalent ones. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A surface treatment process for corrosion resistant gear shafts, characterized by: The method comprises the following steps: Step one: dissolve vanillin in tetrahydrofuran, then add deionized water and sodium percarbonate in sequence, and react at 25-30℃ for 4-5h; after the reaction, neutralize with hydrochloric acid, spin evaporation, extraction, washing, drying, to obtain vanillin diphenol; dissolve vanillin diphenol in acetone, then add catalyst, potassium carbonate and acryloyl chloride in sequence, and reflux at 65-75℃ for 45-55h; after the reaction, dissolve in water, extract, wash, dry, spin evaporation, and separate and purify, to obtain vanillin diene; Step two: dissolve vanillin diene, 2-amino-5-mercapto-1,3,4-thiadiazole and photoinitiator 1173 in dichloromethane, and react under ultraviolet light at 25-28℃ for 15-18h; after the reaction, wash, dry, spin evaporation, to obtain vanillin diamine; mix ethylene carbonate, vanillin diamine and acetone, fully stir, and react at 30-40℃ for 12-18h; after the reaction, filter, grind and dry, to obtain non-isocyanate polyurethane monomer; Step three: under nitrogen environment, mix itaconic acid, non-isocyanate polyurethane monomer, catalyst, polymerization inhibitor and silane coupling agent, heat to 120-130℃ and react for 1-2h; then vacuumize the system to-0.1-0kPa and continue to react for 3-5h; then add dibutyltin dilaurate, and react at 160-170℃ and 0.09-0.10MPa for 4-8h; after the reaction, cool, to obtain non-isocyanate polyurethane; Step four: under nitrogen environment, mix non-isocyanate polyurethane and condensed water, mechanically stir at 80-90℃ for 60-70min, to obtain non-isocyanate polyurethane emulsion; then add photoinitiator 651 and accelerator, fully stir, to obtain photocuring coating; wash the surface of gear shaft with water and alcohol in sequence, then coat the photocuring coating on the surface of gear shaft, and photocure under ultraviolet light for 10-15min, to obtain finished product.

2. A surface treatment process for corrosion resistant gear shaft as claimed in claim 1 wherein: In step one, the content of vanillin diphenol is as follows: 5-7 parts of vanillin, 60-70 parts of tetrahydrofuran, 50-55 parts of deionized water and 12-15 parts of sodium percarbonate.

3. A surface treatment process for corrosion resistant gear shaft as claimed in claim 1 wherein: In step one, when preparing vanillin diene, the reaction molar ratio of vanillin diphenol and acryloyl chloride is 1:(2-2.5); the catalyst is tetrabutylammonium bromide.

4. A surface treatment process for corrosion resistant gear shaft as claimed in claim 1 wherein: In step two, when preparing vanillin diamine, the reaction molar ratio of vanillin diene and 2-amino-5-mercapto-1,3,4-thiadiazole is 1:(3-4).

5. A surface treatment process for corrosion resistant gear shaft as claimed in claim 1 wherein: In step two, when preparing non-isocyanate polyurethane monomer, the reaction molar ratio of ethylene carbonate and vanillin diamine is (2.2-2.5):

1.

6. A surface treatment process for corrosion resistant gear shaft as claimed in claim 1 wherein: In step three, the content of non-isocyanate polyurethane is as follows: 15-18 parts of itaconic acid, 47-55 parts of non-isocyanate polyurethane monomer, 0.11-0.13 parts of catalyst, 0.3-0.5 parts of polymerization inhibitor, 0.3-0.5 parts of silane coupling agent and 0.3-0.5 parts of dibutyltin dilaurate.

7. A surface treatment process for corrosion resistant gear shaft as claimed in claim 6 wherein: The catalyst is p-toluenesulfonic acid monohydrate; the polymerization inhibitor is hydroquinone; and the silane coupling agent is vinyltriethoxysilane.

8. A surface treatment process for corrosion resistant gear shaft as claimed in claim 1 wherein: In step four, the content of each component of the photocuring coating is as follows: 20-30 parts of non-isocyanate polyurethane, 25-30 parts of condensed water, 0.6-0.8 parts of photoinitiator 651, and 0.4-0.5 parts of accelerator; the accelerator is triethanolamine.

9. A surface treatment process for corrosion resistant gear shaft as claimed in claim 1 wherein: In step two and step four, the power of the ultraviolet light is 500-520 W.

10. A surface treatment process for corrosion resistant gear shaft as claimed in claim 1 wherein: In step four, the thickness of the finished coating is 0.5-0.7 mm.