Oil-resistant, corrosion-resistant and anti-aging rubber gasket and processing technology thereof

Abstract

The invention discloses an oil-resistant, corrosion-resistant and anti-aging rubber gasket and a processing technology thereof, and belongs to the technical field of rubber. According to the oil-resistant, corrosion-resistant and anti-aging rubber gasket and the processing technology thereof, the formula of the rubber gasket comprises base materials such as natural rubber, butadiene styrene rubber and fluororubber, and various functional additives such as an antioxidant, an ultraviolet light absorber and an anti-aging agent are combined, so that the oil resistance, the corrosion resistance and the anti-aging performance of rubber are remarkably improved. The rubber gasket adopting the formula has excellent stability and long service life in ultraviolet, thermal oxidation and oil corrosion environments, and is particularly suitable for sealing application in high-temperature, high-pressure and severe environments. In addition, by adding the phosphate additive and the silane coupling agent, the physical and mechanical properties and wear resistance of the rubber are further enhanced. The process is simple, is easy for industrial production, and has a wide application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber, and more specifically, to an oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology. Background Art

[0002] With the continuous advancement of industrial automation and equipment upgrading, the requirements for seals in various industries have become increasingly strict. In the past, traditional rubber gaskets were mainly made by blending single or a few kinds of rubbers, and their oil resistance, corrosion resistance and anti-aging performance were relatively low. When they were in harsh environments such as high temperature, oil stain and chemical media for a long time, problems such as aging, hardening and loss of elasticity were likely to occur, which could not meet the requirements for sealing reliability and long-term stability in the fields of petrochemical industry, automobile, aviation, etc. The limitations of traditional materials often led to seal failure and leakage risks during the operation of equipment, affecting the overall safety and efficiency of the system.

[0003] Currently, new oil-resistant, corrosion-resistant and anti-aging rubber gaskets are made by blending natural rubber, styrene-butadiene rubber and fluororubber, etc., supplemented with functional additives such as antioxidants, ultraviolet absorbers and anti-aging agents, and refined through advanced processing technology. This composite material shows excellent oil resistance and high chemical corrosion resistance in practical applications, significantly delays the aging process, and ensures good sealing performance under high temperature, high pressure and long-term dynamic load. Currently, this technology has been widely applied in petrochemical plants, automobile engines, mechanical equipment and other fields, greatly improving the equipment safety and service life, and has been highly recognized by users.

[0004] Looking ahead, the development of new materials and intelligent manufacturing technology will bring new changes to the rubber gasket industry. On the basis of improving environmental protection and reducing energy consumption, the research and development direction will extend to multi-function, intelligent monitoring and adaptive sealing performance, realizing real-time status feedback and fault warning of the sealing system. With the continuous deepening of industrial upgrading and technological innovation, new rubber gaskets are expected to play a greater role in a wider range of industrial fields, providing a more solid guarantee for industrial safety and efficient operation of equipment. Summary of the Invention

[0005] The purpose of the present invention is to provide an oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology, which has excellent oil resistance, corrosion resistance and anti-aging performance, and is low-cost and environmentally friendly.

[0006] An oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology, characterized in that: an oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology, the component ratio of the oil-resistant, corrosion-resistant and anti-aging rubber gasket is: 30-50 parts of natural rubber, 15-25 parts of styrene-butadiene rubber, 5-15 parts of fluororubber, 1-3 parts of antioxidant, 0.5-1.5 parts of ultraviolet absorber, 0.5-1.5 parts of anti-aging agent, 1-3 parts of 3-aminopropyltriethoxysilane, 1-3 parts of phosphate additive, 10-30 parts of carbon black, 4-7 parts of white carbon black, 0.5-1.5 parts of anti-sticking agent, 4-7 parts of light mineral oil.

[0007] Preferably, the antioxidant is 4020.

[0008] Preferably, the ultraviolet absorber is UV-531.

[0009] Preferably, the anti-aging agent is 2-mercaptobenzothiazole.

[0010] Preferably, the 3-aminopropyltriethoxysilane needs to be dissolved in an ethanol:water solvent with a volume ratio of 8-10:1, control the concentration of 3-aminopropyltriethoxysilane at 2-6 wt%, and carry out ultrasonic reaction at 20-40 °C for 20-40 minutes.

[0011] Preferably, the phosphate additive is tribasic zinc phosphate.

[0012] Preferably, the carbon black is N330.

[0013] Preferably, the white carbon black is silica.

[0014] Preferably, the anti-sticking agent is stearic acid.

[0015] Preferably, the processing technology is to first mix natural rubber, styrene-butadiene rubber, fluororubber, antioxidant, ultraviolet absorber, anti-aging agent, phosphate additive, carbon black, white carbon black, anti-sticking agent, and light mineral oil evenly according to the formula, knead at 100-140 °C for 8-16 minutes. During the kneading process, add the 3-aminopropyltriethoxysilane solution continuously in the form of spraying, then inject the obtained product into a mold to form a gasket shape, place it at 150-190 °C again for vulcanization for 30-60 minutes, age at 50-70 °C for 10-14 h after vulcanization, wash the surface with deionized water, and finally dry it at low temperature.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] (1) In the present invention, the high proportion use of styrene-butadiene rubber and fluororubber enables the rubber gasket to maintain high physical properties for a long time in high-temperature, high-pressure and oily environments, effectively preventing oil penetration and damage, and ensuring the superior performance of the rubber gasket in terms of sealing and durability.

[0018] (2) In the present invention, the addition of fluororubber significantly enhances the corrosion resistance of the gasket in various chemical corrosion environments. Especially in corrosive media such as acids, alkalis, and solvents, the stability of the rubber gasket is greatly improved, making it suitable for highly corrosive applications in industries such as chemical engineering and petroleum.

[0019] (3) In the present invention, antioxidant 4020, ultraviolet absorber UV-531, and anti-aging agent 2-mercaptobenzothiazole are selected. These components can significantly delay the oxidation, ultraviolet aging, and thermal aging of the rubber during long-term use, greatly improving the service life of the rubber gasket and reducing the maintenance and replacement costs.

[0020] (4) In the present invention, after hydrolysis, 3-aminopropyltriethoxysilane can chemically combine with the rubber to form a cross-linked structure, increasing the mechanical strength and tensile resistance of the rubber, improving the overall structural stability of the rubber, and forming a protective film. Zinc tris(phosphate) can form a dense protective film on the rubber surface through a chemical reaction with the rubber, preventing corrosive liquids and chemical substances from directly contacting the rubber, thereby improving the corrosion resistance of the rubber. At the same time, both improve the interfacial bonding between the rubber and the filler, enhancing the overall mechanical properties and fatigue resistance.

[0021] (5) In the present invention, carbon black N330 and white carbon black silica in the formulation play a role in enhancing the mechanical strength and wear resistance of the rubber material, enabling the rubber gasket to significantly improve its tear resistance and compression set resistance during long-term use.

[0022] (6) In the present invention, light mineral oil and an appropriate amount of natural rubber effectively improve the low-temperature flexibility of the rubber gasket, ensuring that the rubber can still maintain good elasticity and sealing performance in low-temperature environments, and avoiding hardening or embrittlement under severe cold conditions.

[0023] (7) In the present invention, the use of anti-sticking agent stearic acid effectively avoids the adhesion of the rubber to other substances during processing or use, ensures the cleanliness of the mold during the production process, and also improves the post-use performance of the rubber, preventing seal failure caused by adhesion.

[0024] (8) In the present invention, all components used comply with environmental protection requirements. Components such as natural rubber and light mineral oil are sustainable materials, which helps to reduce environmental pollution and conforms to the current trend of green and environmentally friendly material applications. Detailed implementation mode

[0025] Example 1:

[0026] An oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology. First, weigh 30 parts of natural rubber, 15 parts of styrene-butadiene rubber, 5 parts of fluororubber, 1 part of antioxidant (4020), 0.5 part of ultraviolet absorber (UV-531), 0.5 part of anti-aging agent (2-mercaptobenzothiazole), 1 part of 3-aminopropyltriethoxysilane, 1 part of phosphate additive (trizinc phosphate), 10 parts of carbon black (N330), 4 parts of white carbon black (silica), 0.5 part of anti-sticking agent (stearic acid), and 4 parts of light mineral oil according to the formula. Then dissolve the weighed 3-aminopropyltriethoxysilane in an ethanol:water solvent with a volume ratio of 8:1, control the concentration of 3-aminopropyltriethoxysilane at 2 wt%, and carry out ultrasonic reaction at 200 °C for 20 minutes to obtain a 3-aminopropyltriethoxysilane solution. Mix the substances other than 3-aminopropyltriethoxysilane evenly, knead at 100 °C for 8 minutes, and continuously add the 3-aminopropyltriethoxysilane solution in the form of spraying during the kneading process. Then inject the obtained product into a mold to form a gasket shape, vulcanize it at 150 °C for 30 minutes again, age it at 50 °C for 10 h after vulcanization, wash the surface with deionized water, and finally dry it at low temperature.

[0027] Example 2:

[0028] An oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology. First, weigh 35 parts of natural rubber, 17.5 parts of styrene-butadiene rubber, 7.5 parts of fluororubber, 1.5 parts of antioxidant (4020), 0.75 part of ultraviolet absorber (UV-531), 0.75 part of anti-aging agent (2-mercaptobenzothiazole), 1.5 parts of 3-aminopropyltriethoxysilane, 1.5 parts of phosphate additive (trizinc phosphate), 15 parts of carbon black (N330), 4.75 parts of white carbon black (silica), 0.75 part of anti-sticking agent (stearic acid), and 4.75 parts of light mineral oil according to the formula. Then dissolve the weighed 3-aminopropyltriethoxysilane in an ethanol:water solvent with a volume ratio of 8.5:1, control the concentration of 3-aminopropyltriethoxysilane at 3 wt%, and carry out ultrasonic reaction at 25 °C for 25 minutes to obtain a 3-aminopropyltriethoxysilane solution. Mix the substances other than 3-aminopropyltriethoxysilane evenly, knead at 110 °C for 10 minutes, and continuously add the 3-aminopropyltriethoxysilane solution in the form of spraying during the kneading process. Then inject the obtained product into a mold to form a gasket shape, vulcanize it at 160 °C for 37 minutes again, age it at 55 °C for 11 h after vulcanization, wash the surface with deionized water, and finally dry it at low temperature.

[0029] Example 3:

[0030] An oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology. First, weigh 40 parts of natural rubber, 20 parts of styrene-butadiene rubber, 10 parts of fluororubber, 2 parts of antioxidant (4020), 1 part of ultraviolet absorber (UV-531), 1 part of anti-aging agent (2-mercaptobenzothiazole), 2 parts of 3-aminopropyltriethoxysilane, 2 parts of phosphate additive (trizinc phosphate), 20 parts of carbon black (N330), 5.5 parts of white carbon black (silica), 1 part of anti-sticking agent (stearic acid), and 5.5 parts of light mineral oil according to the formula. Then dissolve the weighed 3-aminopropyltriethoxysilane in an ethanol:water solvent with a volume ratio of 9:1, control the concentration of 3-aminopropyltriethoxysilane at 4 wt%, and carry out ultrasonic reaction at 30 °C for 30 minutes to obtain a 3-aminopropyltriethoxysilane solution. Mix the substances other than 3-aminopropyltriethoxysilane evenly, knead at 120 °C for 12 minutes. During the kneading process, continuously add the 3-aminopropyltriethoxysilane solution in the form of spraying. Then inject the obtained product into a mold to form a gasket shape, place it at 170 °C again for vulcanization for 45 minutes, age at 60 °C for 12 h after vulcanization, wash the surface with deionized water, and finally dry it at low temperature.

[0031] Example 4:

[0032] An oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology. First, weigh 45 parts of natural rubber, 22.5 parts of styrene-butadiene rubber, 12.5 parts of fluororubber, 2.5 parts of antioxidant (4020), 1.25 parts of ultraviolet absorber (UV-531), 1.25 parts of anti-aging agent (2-mercaptobenzothiazole), 2.5 parts of 3-aminopropyltriethoxysilane, 2.5 parts of phosphate additive (trizinc phosphate), 25 parts of carbon black (N330), 6.25 parts of white carbon black (silica), 1.25 parts of anti-sticking agent (stearic acid), and 6.25 parts of light mineral oil according to the formula. Then dissolve the weighed 3-aminopropyltriethoxysilane in an ethanol:water solvent with a volume ratio of 9.5:1, control the concentration of 3-aminopropyltriethoxysilane at 5 wt%, and carry out ultrasonic reaction at 35 °C for 35 minutes to obtain a 3-aminopropyltriethoxysilane solution. Mix the substances other than 3-aminopropyltriethoxysilane evenly, knead at 130 °C for 14 minutes. During the kneading process, continuously add the 3-aminopropyltriethoxysilane solution in the form of spraying. Then inject the obtained product into a mold to form a gasket shape, place it at 180 °C again for vulcanization for 52 minutes, age at 65 °C for 13 h after vulcanization, wash the surface with deionized water, and finally dry it at low temperature.

[0033] Example 5:

[0034] An oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology. First, weigh 50 parts of natural rubber, 25 parts of styrene-butadiene rubber, 15 parts of fluororubber, 3 parts of antioxidant (4020), 1.5 parts of ultraviolet absorber (UV-531), 1.5 parts of anti-aging agent (2-mercaptobenzothiazole), 3 parts of 3-aminopropyltriethoxysilane, 3 parts of phosphate additive (trizinc phosphate), 30 parts of carbon black (N330), 7 parts of white carbon black (silica), 1.5 parts of anti-sticking agent (stearic acid), and 7 parts of light mineral oil according to the formula. Then dissolve the weighed 3-aminopropyltriethoxysilane in an ethanol:water solvent with a volume ratio of 10:1, control the concentration of 3-aminopropyltriethoxysilane at 6 wt%, and carry out ultrasonic reaction at 20 - 40 °C for 40 minutes to obtain a 3-aminopropyltriethoxysilane solution. Mix the substances other than 3-aminopropyltriethoxysilane evenly, knead at 140 °C for 16 minutes, and continuously add the 3-aminopropyltriethoxysilane solution in the form of spray during the kneading process. Then inject the obtained product into a mold to form a gasket shape, vulcanize it at 190 °C for 60 minutes again, age it at 70 °C for 14 h after vulcanization, wash the surface with deionized water, and finally dry it at low temperature.

[0035] Performance Test

[0036] Oil Resistance Performance Test

[0037] Make the materials obtained in Examples 1 - 5 into a strip with a size of 10 mm × 10 mm × 3 mm, put it into a specified oil medium (such as mineral oil) at a temperature of 70 °C, soak it for 24 hours, and use a Shore hardness tester and a Sartorius BP210S electronic balance to test the hardness and mass before and after soaking respectively, and calculate the swelling rate. The calculation formula is: Swelling rate (%) = [(weight of the sample after soaking - weight of the sample before soaking) / weight of the sample before soaking] × 100%. Referring to the national standard GB / T1681 - 2008, the following table shows the test results:

[0038]

[0039] Corrosion Resistance Performance Test

[0040] The materials obtained in Examples 1-5 were made into a strip with dimensions of 10 mm × 10 mm × 3 mm. It was placed in hydrochloric acid with a concentration of 5% at a temperature of 50 °C and soaked for 24 hours. An Instron 3369 tensile testing machine was used to test the tensile strength and elongation at break after soaking. A Shore hardness tester and a Sartorius BP210S electronic balance were used to test the hardness and mass before and after soaking, and the swelling rate was calculated. The calculation formula is: Swelling rate (%) = [(weight of the sample after soaking - weight of the sample before soaking) / weight of the sample before soaking] × 100%. Referring to the national standard GB / T 5311-2008, the following table shows the test results:

[0041]

[0042]

[0043] Anti-aging performance test

[0044] The materials obtained in Examples 1-5 were made into a strip with dimensions of 10 mm × 10 mm × 3 mm. It was placed in a JBS-100 aging chamber for hot air aging test at a temperature of 70 °C and soaked for 24 hours. An Instron 3369 tensile testing machine was used to test the tensile strength and elongation at break after aging. A Shore hardness tester was used to test the hardness before and after aging. Referring to the national standard GB / T 16584-2008, the following table shows the test results:

[0045]

[0046] Ultraviolet aging test

[0047] The materials obtained in Examples 1-5 were made into a strip with dimensions of 10 mm × 10 mm × 3 mm. It was placed in a Q-LAB ultraviolet aging test machine for ultraviolet aging test with an irradiance of 0.35 W / m2 at a temperature of 70 °C and irradiated for 1000 h. An Instron 3369 tensile testing machine was used to test the tensile strength and elongation at break after aging. A Shore hardness tester was used to test the hardness before and after aging. Referring to the national standard GB / T 16585-2009, the following table shows the test results:

[0048]

Claims

1. An oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology, characterized in that: An oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology. The component ratio of the oil-resistant, corrosion-resistant and anti-aging rubber gasket is as follows: 30-50 parts of natural rubber, 15-25 parts of styrene-butadiene rubber, 5-15 parts of fluororubber, 1-3 parts of antioxidant, 0.5-1.5 parts of ultraviolet absorber, 0.5-1.5 parts of anti-aging agent, 1-3 parts of 3-aminopropyltriethoxysilane, 1-3 parts of phosphate additive, 10-30 parts of carbon black, 4-7 parts of white carbon black, 0.5-1.5 parts of anti-sticking agent, 4-7 parts of light mineral oil.

2. The oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology according to claim 1 are characterized in that: The antioxidant is 4020.

3. A kind of oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology according to claim 1, characterized in that: The ultraviolet absorber is UV-531.

4. A kind of oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology according to claim 3, characterized in that: The anti-aging agent is 2-mercaptobenzothiazole.

5. A kind of oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology according to claim 1, characterized in that: The 3-aminopropyltriethoxysilane needs to be dissolved in an ethanol:water solvent with a volume ratio of 8-10:1, control the concentration of 3-aminopropyltriethoxysilane at 2-6 wt%, and carry out ultrasonic reaction at 20-40 °C for 20-40 minutes.

6. A kind of oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology according to claim 1, characterized in that: The phosphate additive is tribasic zinc phosphate.

7. A kind of oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology according to claim 1, characterized in that: The carbon black is N330.

8. A kind of oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology according to claim 1, characterized in that: The white carbon black is silica.

9. A kind of oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology according to claim 1, characterized in that: The anti-sticking agent is stearic acid.

10. A kind of oil-resistant, corrosion-resistant and anti-aging rubber gasket and its processing technology according to claim 1, characterized in that: The processing technology is as follows: first mix natural rubber, styrene-butadiene rubber, fluororubber, antioxidant, ultraviolet absorber, anti-aging agent, phosphate additive, carbon black, white carbon black, anti-sticking agent, light mineral oil evenly according to the formula, knead at 100-140 °C for 8-16 minutes. During the kneading process, continuously add the 3-aminopropyltriethoxysilane solution in the form of spray. Then inject the obtained product into a mold to form a gasket shape, place it at 150-190 °C again for vulcanization for 30-60 minutes. After the vulcanization is completed, age at 50-70 °C for 10-14 h, then wash the surface with deionized water, and finally dry at low temperature.

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