A corrosion-resistant rubber sealing ring and its preparation process

Abstract

The invention discloses a corrosion-resistant rubber seal ring and a preparation process thereof, and belongs to the field of processing and preparation of rubber seal rings. The preparation process comprises the following steps: putting an organosilicon rubber precursor, an inorganic metal oxide filler, a plasticizer and an antioxidant into a mixer for rubber mixing, and then demolding to obtain the corrosion-resistant rubber seal ring. The invention constructs an aminobenzene compound through a disulfide bond reaction, and then prepares an amino alcohol silane coupling agent through affinity addition of an amino group and an epoxy silane coupling agent, and the amino alcohol silane coupling agent and a hydroxyl-terminated polysilicone oil are catalyzed by an acidic catalyst to obtain a prepolymer emulsion, and the prepolymer emulsion is catalyzed by a titanate catalyst to obtain an organosilicon rubber precursor, and the organosilicon rubber precursor is mixed with an inorganic metal oxide filler, a plasticizer and an antioxidant for rubber mixing, and the obtained corrosion-resistant rubber seal ring has good corrosion resistance, mechanical properties and good toughness at low temperatures.

Description

Technical Field

[0001] The invention belongs to the field of processing and preparing rubber sealing rings, and in particular relates to a corrosion-resistant rubber sealing ring and a preparation process thereof. Background Art

[0002] Rubber is a high-quality polymer material with high elasticity and viscoelasticity. It is widely used in the automotive industry, aerospace industry, construction engineering, medical food, and electronic and electrical industries. my country is a major rubber country in the world, ranking first in the world in both rubber consumption and rubber product output. Rubber materials are mainly divided into two categories: natural rubber and synthetic rubber. Natural rubber is processed and prepared from the extraction of gum from plants such as rubber trees and rubber grass. The main component is cis-1,4-polyisoprene; synthetic rubber is prepared from various monomers through polymerization reactions, mainly including fluororubber, styrene-butadiene rubber, ethylene-propylene rubber, and silicone rubber. Synthetic rubber has good performance in high temperature resistance, aging resistance, and corrosion resistance due to the improvement of the composition structure of rubber.

[0003] Patent CN116218104A discloses a method for preparing a plasma-resistant graphene-based fluororubber sealing ring for semiconductors. The invention uses fluororubber, fluoroelastomer, graphene oxide, hindered phenol, magnesium oxide, vulcanizer, and compatibilizer as synthetic raw materials, and adopts a mechanical blending method to prepare a plasma-resistant graphene-based fluororubber sealing ring for semiconductors. The hexafluorobutyl ester and trifluoromethyl functional groups in the solubilizer enhance the interfacial interaction between the fluororubber compositions, making the combination between the fluoroelastomer, graphene oxide, hindered phenol and magnesium oxide more uniform, thereby improving the mechanical properties and plasma resistance.

[0004] Patent CN108504003A discloses a synthetic rubber sealing ring material and a preparation method thereof. The invention uses fluororubber, 3F fluororubber, bisphenol AF, a vulcanizer, an accelerator BPP, an inorganic filler, calcined diatomaceous earth, tetrafluoro micropowder, a polymer processing aid, benzene wax, a rubber pigment colorant and a fluororubber polymer as raw materials. Through the synergistic effect between tetrafluoro micropowder and fluoropolymer, barium sulfate and calcined diatomaceous earth components, and the use of a low-temperature, long-term and intelligent vulcanization process, the synthetic rubber sealing ring material of the invention has strong chemical inertness and good stability, and has obtained super wear resistance, acid and alkali resistance, corrosion resistance and high temperature resistance.

[0005] Patent CN115873359A discloses a fluororubber ultra-fine seal for protecting the gap of an electrostatic suction cup. The invention prepares a fluorine-containing polymer by mixing tetrafluoroethylene, perfluoroalkyl ethyl compounds, perfluoroalkyl vinyl ether and a cross-linking agent, and then mixes it with an inorganic filler to obtain a fluororubber ultra-fine seal, thereby improving the corrosion resistance and mechanical properties of the fluororubber ultra-fine seal.

[0006] The main raw material of the above-mentioned sealing ring is fluorine-containing material. Since fluorine-containing materials will inevitably produce harmful fluorides during the production, use and disposal process, they have potential safety hazards to the environment and human health. The EU and US FDA have strict requirements on the application of fluorine-containing materials in food, medicine and other fields that have direct or indirect contact with the human body, and have also formulated relevant proposals for a comprehensive ban on fluorine. In addition, fluorine-containing rubber is brittle in low temperature environments, making it not cold-resistant, which affects the application scope of rubber sealing rings.

[0007] Therefore, it is of great significance to design a fluorine-free and corrosion-resistant rubber sealing ring to address the defects of fluorine-containing materials in the application of food, medicine, medical equipment and other fields. Summary of the invention

[0008] In view of the deficiencies of the prior art, the present invention constructs an aminobenzene compound through a disulfide bond reaction, and then prepares an amino alcohol silane coupling agent through affinity addition of an amino group and an epoxy group silane coupling agent, obtains a prepolymer emulsion by the amino alcohol silane coupling agent and a hydroxyl-terminated polysilicone oil under the catalysis of an acidic catalyst, obtains an organosilicon rubber precursor under the accelerated catalytic polymerization of a titanate catalyst, and mixes the organosilicon rubber precursor with an inorganic metal oxide filler, a plasticizer, and an antioxidant to obtain a corrosion-resistant rubber sealing ring, thereby solving the problems raised in the background technology. Specifically, the technical scheme of the present invention includes the following contents:

[0009] A corrosion-resistant rubber sealing ring, comprising the following raw materials in parts by weight:

[0010] 12 to 23 parts by weight of an organic silicone rubber precursor, 4 to 6 parts by weight of an inorganic metal oxide filler, 0.1 to 1 part by weight of a plasticizer and 0.5 to 0.8 part by weight of an antioxidant.

[0011] Furthermore, the preparation method of the organic silicone rubber precursor comprises the following steps:

[0012] The benzene ring derivative and hydrogen peroxide are mixed in a mass ratio of 1:0.2-0.3 and then catalytically reacted at 40°C-50°C for 40min-80min to obtain an aminobenzene compound;

[0013] The aminobenzene compound and the epoxy silane coupling agent are mixed in equal amounts, heated to 30° C. to 40° C., and reacted for 30 min to 50 min to obtain an amino alcohol silane coupling agent;

[0014] The amino alcohol silane coupling agent, hydroxyl-terminated polysilicone oil, nonionic emulsifier, acid catalyst and deionized water are mixed and stirred to form a prepolymer emulsion;

[0015] The prepolymer emulsion and the titanate catalyst are mixed in a mass ratio of 1:0.01-0.05, heated to 60°C-80°C for reaction for 2h-3h, and naturally cooled and solidified to obtain the silicone rubber precursor.

[0016] Furthermore, the benzene ring derivative includes 2-aminothiophenol or 4-aminothiophenol, and the structure of the benzene ring derivative needs to have an amino group, a benzene ring and a thiol group, the benzene ring serves as a functional group for improving corrosion resistance, the thiol group is used to form a disulfide bond, and the amino group is used to undergo nucleophilic addition with an epoxy group.

[0017] Furthermore, the epoxy silane coupling agent includes γ-glycidyloxypropyltrimethoxysilane, γ-glycidyloxypropyltriethoxysilane, 2-(3,4-epoxycyclohexane)ethyltrimethoxysilane or γ-glycidyloxypropylmethyldiethoxysilane.

[0018] Furthermore, the hydroxyl-terminated polysilicone oil includes hydroxyl-terminated polydimethylsiloxane.

[0019] Furthermore, the nonionic emulsifier includes Span 60 or Span 80.

[0020] Furthermore, the acidic catalyst includes thiosalicylic acid, aminosulfonic acid or dodecylbenzenesulfonic acid.

[0021] Furthermore, the titanate catalyst includes tetraethyl titanate, tetrabutyl titanate or isopropyl titanate, and the purpose of the titanate catalyst is to accelerate the cross-linking polymerization of the silane compound in the prepolymer emulsion.

[0022] Furthermore, the mass ratio of the amino alcohol silane coupling agent: hydroxyl-terminated polysilicone oil: non-ionic emulsifier: acidic catalyst: deionized water is 0.1-0.2:1:0.01-0.03:0.02-0.04:0.3-0.4.

[0023] A preparation process of a corrosion-resistant rubber sealing ring, the preparation process comprising the following steps:

[0024] 12 to 23 parts by weight of an organic silicone rubber precursor, 4 to 6 parts by weight of an inorganic metal oxide filler, 0.1 to 1 part by weight of a plasticizer and 0.5 to 0.8 part by weight of an antioxidant are put into a mixer, and the mixture is kneaded for 30 to 50 minutes at 90 to 110° C. and 10 to 15 MPa, and then the corrosion-resistant rubber sealing ring is obtained by demolding.

[0025] Furthermore, the inorganic metal oxide filler includes aluminum oxide powder, cerium oxide powder or iron oxide powder.

[0026] Furthermore, the plasticizer includes dioctyl phthalate, dibutyl phthalate or diisooctyl phthalate.

[0027] Furthermore, the antioxidant includes 2,5-di-tert-butylhydroquinone, N,N'-diphenyl-p-phenylenediamine or 2,6-di-tert-butyl-p-cresol.

[0028] (1) The present invention constructs an aminobenzene compound by initially oxidizing sulfhydryl groups to form disulfide bonds, thereby avoiding the need for an additional high-temperature and high-pressure vulcanization process during rubber refining, thereby reducing production costs and shortening the production process.

[0029] (2) The aminobenzene compound constructed by the present invention uses the nitrogen atom of the amino group as a nucleophilic reagent to attack the carbon atom of the epoxy group on the silane coupling agent of the epoxy group, and a nucleophilic addition reaction occurs, thereby opening the epoxy ring to form an amino alcohol silane coupling agent. The amino alcohol silane coupling agent and the hydroxyl-terminated polysilicone oil are used as raw materials, and hydrolyzed and condensed under the catalytic effect of an acid catalyst to obtain a prepolymer emulsion. The prepolymer emulsion is accelerated to polymerize under the action of a titanate catalyst. The titanium hydroxy compound formed by the titanate catalyst forms a titanium-silicon oxygen bond with the prepolymer emulsion, thereby promoting the cross-linking reaction of the prepolymer emulsion to form an organic silicone rubber precursor. The organic silicone rubber precursor is mixed with an inorganic metal oxide filler, a plasticizer, and an antioxidant to obtain a corrosion-resistant rubber sealing ring. The disulfide bond serves as a "bridge" to connect the benzene ring to the prepolymer emulsion. The amino group is cross-linked to the epoxy silane coupling agent to form a cross-linked network. The highly stable conjugated π electron system and hydrophobicity of the benzene ring reduce the decomposition rate of the molecular chain in an oxidative environment, improve the chemical inertness in an acidic and alkaline environment, and reduce the dissolution and swelling behavior of the polymer. The titanate catalyst further catalyzes the formation of a higher density cross-linked system, thereby increasing the cross-linking density. The inorganic metal oxide forms a dynamic complex structure with the polymer through metal coordination, and then cooperates with the plasticizer and antioxidant to form a silicone rubber precursor with a dynamic interpenetrating polymerization three-dimensional network structure, which not only achieves the technical purpose of fluorine-free, but also ensures that the rubber sealing ring prepared under certain process parameters has good corrosion resistance, mechanical properties and cold resistance.

[0030] (3) It can be seen from the results of Example 6 and Comparative Examples 1 to 2 that the corrosion resistance and mechanical properties of the benzene ring alone are poorly improved. Further increasing the amount of the benzene ring derivative aniline, although the corrosion resistance is improved to a certain extent, the rigidity of the material is greatly improved, the brittleness is increased, and it is not resistant to use in low temperature environments.

[0031] (4) It can be seen from the results of Example 6 and Comparative Examples 3 to 4 that although a rubber sealing ring can be prepared without adding a phthalate catalyst, an inorganic metal oxide, a plasticizer and an antioxidant, due to the reduction in crosslinking density, the corrosion resistance of the rubber sealing ring prepared by simply introducing benzene rings into the rubber through disulfide bonds is poorly improved, and the mechanical properties are also poor. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be clearly and completely described below through 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0033] Unless otherwise specified, the raw materials and reagents used in the present invention are commercially available or can be prepared by known methods.

[0034] Preparation Example 1:

[0035] The preparation of silicone rubber precursor specifically includes the following processes:

[0036] 1 kg of 2-aminobenzenethiol was dissolved in 3 kg of ether solution, 200 g of 30% hydrogen peroxide solution was added and mixed and stirred evenly, then heated to 40°C for 40 min and cooled naturally to obtain an aminobenzene compound solution. Subsequently, 2 kg of γ-glycidyloxypropyltrimethoxysilane was mixed and stirred with 2 kg of aminobenzene compound solution and heated to 30°C for 30 min. After the reaction was completed, the ether was removed by reduced pressure evaporation to recover the amino alcohol silane coupling agent.

[0037] Weigh 1 kg of amino alcohol silane coupling agent, 10 kg of hydroxyl-terminated polydimethylsiloxane, 100 g of Span 60, 200 g of thiosalicylic acid and 3 kg of deionized water, mix them, and stir them at 200 r / min for 20 min to obtain a prepolymer emulsion. Add 143 g of tetraethyl titanate to the prepolymer emulsion, then raise the temperature to 60°C and stir to react for 2 h. Pour it into a mold and naturally cool and solidify to obtain a silicone rubber precursor.

[0038] Preparation Example 2:

[0039] The preparation of silicone rubber precursor specifically includes the following processes:

[0040] 1 kg of 2-aminobenzenethiol was dissolved in 3 kg of ether solution, 220 g of 30% hydrogen peroxide solution was added and mixed and stirred evenly, then heated to 42°C for 50 min and cooled naturally to obtain an aminobenzene compound solution. Subsequently, 2 kg of γ-glycidyloxypropyltrimethoxysilane was mixed and stirred with 2 kg of aminobenzene compound solution and heated to 32°C for 35 min. After the reaction was completed, the ether was removed by reduced pressure evaporation to recover the amino alcohol silane coupling agent.

[0041] Weigh 1 kg of amino alcohol silane coupling agent, 10 kg of hydroxyl-terminated polydimethylsiloxane, 100 g of Span 60, 200 g of thiosalicylic acid and 3 kg of deionized water, mix them, stir at 200 r / min for 20 min to obtain a prepolymer emulsion, add 286 g of tetraethyl titanate to the prepolymer emulsion, then raise the temperature to 65 ° C and stir to react for 2 h, pour it into a mold and naturally cool and solidify to obtain a silicone rubber precursor.

[0042] Preparation Example 3:

[0043] The preparation of silicone rubber precursor specifically includes the following processes:

[0044] 1 kg of 2-aminobenzenethiol was dissolved in 3 kg of ether solution, 240 g of 30% hydrogen peroxide solution was added and mixed and stirred evenly, then heated to 44°C for 60 min and cooled naturally to obtain an aminobenzene compound solution. Subsequently, 2 kg of γ-glycidyloxypropyltriethoxysilane was mixed and stirred with 2 kg of aminobenzene compound solution and heated to 34°C for 40 min. After the reaction was completed, the ether was removed by reduced pressure evaporation to recover the amino alcohol silane coupling agent.

[0045] Weigh 1.5 kg of amino alcohol silane coupling agent, 10 kg of hydroxyl-terminated polydimethylsiloxane, 200 g of Span 60, 300 g of aminosulfonic acid and 3.5 kg of deionized water, mix them, stir at 250 r / min for 25 min to obtain a prepolymer emulsion, add 310 g of tetrabutyl titanate to the prepolymer emulsion, then raise the temperature to 70°C and stir to react for 2.5 h, pour it into a mold and naturally cool and solidify to obtain a silicone rubber precursor.

[0046] Preparation Example 4:

[0047] The preparation of silicone rubber precursor specifically includes the following processes:

[0048] 1 kg of 4-aminobenzenethiol was dissolved in 3 kg of ether solution, 260 g of 30% hydrogen peroxide solution was added and mixed and stirred evenly, then heated to 46°C for 70 min and cooled naturally to obtain an aminobenzene compound solution. Subsequently, 2 kg of 2-(3,4-epoxycyclohexane)ethyltrimethoxysilane was mixed and stirred with 2 kg of aminobenzene compound solution and heated to 36°C for 45 min. After the reaction was completed, the ether was removed by reduced pressure evaporation to obtain an amino alcohol silane coupling agent.

[0049] Weigh 1.5 kg of amino alcohol silane coupling agent, 10 kg of hydroxyl-terminated polydimethylsiloxane, 200 g of Span 80, 300 g of aminosulfonic acid and 3.5 kg of deionized water, mix them, stir at 250 r / min for 25 min to obtain a prepolymer emulsion, add 620 g of tetrabutyl titanate to the prepolymer emulsion, then raise the temperature to 75 ° C and stir to react for 2.5 h, pour it into a mold and naturally cool and solidify to obtain a silicone rubber precursor.

[0050] Preparation Example 5:

[0051] The preparation of silicone rubber precursor specifically includes the following processes:

[0052] 1 kg of 4-aminobenzenethiol was dissolved in 3 kg of ether solution, 280 g of 30% hydrogen peroxide solution was added and mixed and stirred evenly, then heated to 48°C for 80 min of timing reaction and naturally cooled to obtain an aminobenzene compound solution. Subsequently, 2 kg of 2-(3,4-epoxycyclohexane)ethyltrimethoxysilane was mixed and stirred with 2 kg of aminobenzene compound solution and heated to 38°C for 50 min of timing reaction. After the reaction was completed, the ether was removed by reduced pressure evaporation to recover the amino alcohol silane coupling agent.

[0053] Weigh 2kg of amino alcohol silane coupling agent, 10kg of hydroxyl-terminated polydimethylsiloxane, 300g of Span 80, 400g of dodecylbenzenesulfonic acid and 4kg of deionized water, mix them, and stir them at 300r / min for 30min to obtain a prepolymer emulsion. Add 668g of isopropyl titanate to the prepolymer emulsion, then raise the temperature to 80°C and stir to react for 3h. Pour it into a mold and naturally cool and solidify to obtain a silicone rubber precursor.

[0054] Preparation Example 6:

[0055] The preparation of silicone rubber precursor specifically includes the following processes:

[0056] 1 kg of 4-aminobenzenethiol was dissolved in 3 kg of ether solution, 300 g of 30% hydrogen peroxide solution was added and mixed and stirred evenly, then heated to 50°C for 80 min of timed reaction and naturally cooled to obtain an aminobenzene compound solution. Subsequently, 2 kg of γ-glycidyloxypropylmethyldiethoxysilane was mixed and stirred with 2 kg of aminobenzene compound solution and heated to 40°C for 50 min of timed reaction. After the reaction was completed, the ether was removed by reduced pressure evaporation to recover the amino alcohol silane coupling agent.

[0057] Weigh 2kg of amino alcohol silane coupling agent, 10kg of hydroxyl-terminated polydimethylsiloxane, 300g of Span 80, 400g of dodecylbenzene sulfonic acid and 4kg of deionized water, mix them, and stir them at 300r / min for 30min to obtain a prepolymer emulsion. Add 835g of isopropyl titanate to the prepolymer emulsion, then raise the temperature to 80°C and stir to react for 3h. Pour it into a mold and naturally cool and solidify to obtain a silicone rubber precursor.

[0058] Preparation Example 7:

[0059] The preparation of silicone rubber precursor specifically includes the following processes:

[0060] The 4-aminothiophenol in Preparation Example 6 was replaced by aniline, and the other conditions were the same as those in Preparation Example 6.

[0061] Preparation Example 8:

[0062] The preparation of silicone rubber precursor specifically includes the following processes:

[0063] The 4-aminobenzenethiol in Preparation Example 6 was replaced by aniline and the amount was increased to 2 kg. The other conditions were the same as those in Preparation Example 6.

[0064] Preparation Example 9:

[0065] The preparation of silicone rubber precursor specifically includes the following processes:

[0066] The isopropyl titanate catalytic treatment in Preparation Example 6 was removed, and the other conditions remained the same as in Preparation Example 6.

[0067] Embodiment 1:

[0068] A preparation process of a corrosion-resistant rubber sealing ring, specifically comprising the following processes:

[0069] 12 parts by weight of the silicone rubber precursor of Preparation Example 1, 4 parts by weight of aluminum oxide powder, 0.1 parts by weight of dioctyl phthalate and 0.5 parts by weight of 2,5-di-tert-butylhydroquinone were put into a mixer. The temperature of the mixer was controlled to be 90°C and the pressure to be 10 MPa. The rubber was mixed for 30 minutes and then poured into a mold and cooled naturally to obtain a corrosion-resistant rubber sealing ring.

[0070] Embodiment 2:

[0071] A preparation process of a corrosion-resistant rubber sealing ring, specifically comprising the following processes:

[0072] 14 parts by weight of the silicone rubber precursor of Preparation Example 2, 4 parts by weight of aluminum oxide powder, 0.3 parts by weight of dioctyl phthalate and 0.5 parts by weight of 2,5-di-tert-butylhydroquinone were put into a mixer. The temperature of the mixer was controlled to be 95°C and the pressure to be 10 MPa. The rubber was mixed for 35 minutes and then poured into a mold and cooled naturally to obtain a corrosion-resistant rubber sealing ring.

[0073] Embodiment 3:

[0074] A preparation process of a corrosion-resistant rubber sealing ring, specifically comprising the following processes:

[0075] 16 parts by weight of the silicone rubber precursor of Preparation Example 3, 5 parts by weight of cerium oxide powder, 0.5 parts by weight of dibutyl phthalate and 0.6 parts by weight of N,N'-diphenyl-p-phenylenediamine are put into a mixer. The temperature of the mixer is controlled to be 100°C and the pressure is 12 MPa. The rubber is mixed for 40 minutes and then poured into a mold and cooled naturally to obtain a corrosion-resistant rubber sealing ring.

[0076] Embodiment 4:

[0077] A preparation process of a corrosion-resistant rubber sealing ring, specifically comprising the following processes:

[0078] 19 parts by weight of the silicone rubber precursor of Preparation Example 4, 5 parts by weight of cerium oxide powder, 0.7 parts by weight of dibutyl phthalate and 0.6 parts by weight of N,N'-diphenyl-p-phenylenediamine were put into a mixer. The temperature of the mixer was controlled to be 105°C and the pressure to be 12 MPa. The rubber was mixed for 45 minutes and then poured into a mold and cooled naturally to obtain a corrosion-resistant rubber sealing ring.

[0079] Embodiment 5:

[0080] A preparation process of a corrosion-resistant rubber sealing ring, specifically comprising the following processes:

[0081] 21 parts by weight of the silicone rubber precursor of Preparation Example 5, 6 parts by weight of iron oxide powder, 0.9 parts by weight of diisooctyl phthalate and 0.8 parts by weight of 2,6-di-tert-butyl-p-cresol are put into a mixer. The temperature of the mixer is controlled to be 110°C and the pressure is 14 MPa. The rubber is mixed for 50 minutes and then poured into a mold and cooled naturally to obtain a corrosion-resistant rubber sealing ring.

[0082] Embodiment 6:

[0083] A preparation process of a corrosion-resistant rubber sealing ring, specifically comprising the following processes:

[0084] Put 23 parts by weight of the silicone rubber precursor of Preparation Example 6, 6 parts by weight of iron oxide powder, 1 part by weight of di-isooctyl phthalate and 0.8 parts by weight of 2,6-di-tert-butyl-p-cresol into a mixer. Control the temperature of the mixer to 110°C and the pressure to 15 MPa. Mix the rubber for 50 minutes and then pour it into a mold and cool it naturally to obtain a corrosion-resistant rubber sealing ring.

[0085] Comparative Example 1:

[0086] A preparation process of a corrosion-resistant rubber sealing ring, specifically comprising the following processes:

[0087] The organosilicon rubber precursor in Example 6 was replaced by the organosilicon rubber precursor in Preparation Example 7, and the other conditions remained the same as in Example 6.

[0088] Comparative Example 2:

[0089] A preparation process of a corrosion-resistant rubber sealing ring, specifically comprising the following processes:

[0090] The organosilicon rubber precursor in Example 6 was replaced by the organosilicon rubber precursor in Preparation Example 8, and the other conditions remained the same as in Example 6.

[0091] Comparative Example 3:

[0092] A preparation process of a corrosion-resistant rubber sealing ring, specifically comprising the following processes:

[0093] The organosilicon rubber precursor in Example 6 was replaced by the organosilicon rubber precursor in Preparation Example 9, and the other conditions remained the same as in Example 6.

[0094] Comparative Example 4:

[0095] A preparation process of a corrosion-resistant rubber sealing ring, specifically comprising the following processes:

[0096] The iron oxide powder, diisooctyl phthalate and 2,6-di-tert-butyl-p-cresol in Example 6 were removed and not added, and the other conditions remained the same as in Example 6.

[0097] The corrosion-resistant rubber sealing rings obtained in Examples 1 to 6 and Comparative Examples 1 to 4 were tested for tensile strength and acid-base corrosion according to GB / T 528-2009 Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber and GB / T 1763-1979 Determination of chemical resistance of paint films. The impact properties after immersion at -70°C were tested using a plastic low-temperature impact testing machine. The results are shown in the following table:

[0098]

[0099]

[0100] The above-described embodiments provide a detailed description of the technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected.

Claims

1. A corrosion-resistant rubber sealing ring, characterized in that: The corrosion-resistant rubber sealing ring comprises the following raw materials in parts by weight: 12 to 23 parts by weight of an organic silicone rubber precursor, 4 to 6 parts by weight of an inorganic metal oxide filler, 0.1 to 1 part by weight of a plasticizer, and 0.5 to 0.8 part by weight of an antioxidant; The preparation method of the organic silicone rubber precursor comprises the following steps: The benzene ring derivative and hydrogen peroxide are mixed in a mass ratio of 1:0.2-0.3 and then catalytically reacted at 40°C-50°C for 40min-80min to obtain an aminobenzene compound; The aminobenzene compound and the epoxy silane coupling agent are mixed in equal amounts, heated to 30° C. to 40° C., and reacted for 30 min to 50 min to obtain an amino alcohol silane coupling agent; The amino alcohol silane coupling agent, hydroxyl-terminated polysilicone oil, nonionic emulsifier, acid catalyst and deionized water are mixed and stirred to form a prepolymer emulsion; The prepolymer emulsion and the titanate catalyst are mixed in a mass ratio of 1:0.01-0.05, heated to 60°C-80°C for reaction for 2h-3h, and naturally cooled and solidified to obtain the silicone rubber precursor; The benzene ring derivative is 2-aminothiophenol or 4-aminothiophenol.

2. A corrosion-resistant rubber sealing ring according to claim 1, characterized in that: The epoxy silane coupling agent includes γ-glycidyloxypropyltrimethoxysilane, γ-glycidyloxypropyltriethoxysilane, 2-(3,4-epoxycyclohexane)ethyltrimethoxysilane or γ-glycidyloxypropylmethyldiethoxysilane.

3. The corrosion-resistant rubber sealing ring according to claim 1, characterized in that: The hydroxyl-terminated polysilicone oil includes hydroxyl-terminated polydimethylsiloxane.

4. The corrosion-resistant rubber sealing ring according to claim 1, characterized in that: The nonionic emulsifier includes Span 60 or Span 80.

5. The corrosion-resistant rubber sealing ring according to claim 1, characterized in that: The acidic catalyst includes thiosalicylic acid, aminosulfonic acid or dodecylbenzenesulfonic acid.

6. The corrosion-resistant rubber sealing ring according to claim 1, characterized in that: The titanate catalyst includes tetraethyl titanate, tetrabutyl titanate or isopropyl titanate.

7. The corrosion-resistant rubber sealing ring according to claim 1, characterized in that: The mass ratio of the amino alcohol silane coupling agent: hydroxyl-terminated polysilicone oil: non-ionic emulsifier: acid catalyst: deionized water is 0.1-0.2:1:0.01-0.03:0.02-0.04:0.3-0.

4.

8. A process for preparing a corrosion-resistant rubber sealing ring as claimed in any one of claims 1 to 7, characterized in that: The preparation process comprises the following steps: 12 to 23 parts by weight of an organic silicone rubber precursor, 4 to 6 parts by weight of an inorganic metal oxide filler, 0.1 to 1 part by weight of a plasticizer and 0.5 to 0.8 part by weight of an antioxidant are put into a mixer, and the mixture is kneaded for 30 to 50 minutes at 90 to 110° C. and 10 to 15 MPa, and then the corrosion-resistant rubber sealing ring is obtained by demolding.

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