Toughened sealing ring material and preparation method thereof

Abstract

The invention discloses a toughened sealing ring material and a preparation method thereof.The toughened sealing ring material is prepared from, by weight, 100-120 parts of modified polymer, 20-30 parts of modified filler, 20-30 parts of carbon black, 15-30 parts of plasticizer, 5-10 parts of stearic acid and 5-10 parts of zinc oxide, the raw materials are melted and internally mixed and then soaked in deionized water, and the toughened sealing ring material is obtained. And drying and curing to obtain the toughened sealing ring material. A nano domain with a multiple hydrogen bond structure is constructed on the modified polymer, when the material is subjected to external stress, the hydrogen bond structure is damaged to absorb a large amount of energy so as to achieve the toughening effect, and a bimetal organic framework and a silicon dioxide network on the modified filler form a hierarchical porous structure which serves as a nano reinforced phase to effectively hinder crack propagation. A plurality of cross-linking sites are added between the modified polymer and the modified filler, so that external force can be dispersed, stress concentration is avoided, slippage of molecular chains can be inhibited, and the mechanical property of the material is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of sealing ring material preparation, in particular to a toughened sealing ring material and a preparation method thereof. BACKGROUND

[0002] With the development of social productivity and the continuous improvement of industrial manufacturing level, sealing rings are widely used in many fields such as automobiles, aerospace, chemical industry, energy and medical treatment. There are various types of sealing ring materials, and different materials have different characteristics and application scenarios. Rubber products, as an important part of industrial products, are applied to the sealing field due to their unique high-elasticity characteristics. Traditional sealing ring materials mainly rely on natural rubber, nitrile rubber and polyurethane, which perform well under normal temperature and pressure, but have problems such as low hardness, poor tear resistance and compression permanent deformation under high pressure or high-speed friction. At the same time, the friction coefficient between traditional sealing materials and metal equipment is large, which can easily lead to sealing failure. Therefore, a modified sealing ring material with high toughness and mechanical properties needs to be prepared to solve the problems in actual application. SUMMARY

[0003] The application aims to provide a toughened sealing ring material and a preparation method thereof, and solve the problem of poor mechanical properties of the toughened sealing ring material at the present stage.

[0004] The object of the application can be achieved by the following technical solutions.

[0005] A preparation method of a toughened sealing ring material, specifically comprising the following steps:

[0006] The following weight parts of raw materials are weighed: 100-120 parts of modified polymer, 20-30 parts of modified filler, 20-30 parts of carbon black, 15-30 parts of plasticizer, 5-10 parts of stearic acid and 5-10 parts of zinc oxide. The raw materials are melt-densified for 5-20 min under the condition of a rotation speed of 50-70 r / min and a temperature of 110-130 DEG C to obtain a blend. The blend is soaked in deionized water at a temperature of 20-30 DEG C for 2-4 h, and after drying and curing treatment, a toughened sealing ring material is obtained.

[0007] Further, the plasticizer is one or more of dioctyl phthalate, trimethylphenyl phosphate and epoxy fatty acid octyl ester in any proportion.

[0008] Further, the modified polymer is prepared by the following steps:

[0009] Step Al: 2,7-naphthyridin-l-amine, hexamethylene diisocyanate and dimethyl sulfoxide were mixed uniformly, and reacted at 100-120 r / min and 100-130 °C under nitrogen atmosphere for 16-20 h to obtain a urea compound. The urea compound and dimethyl sulfoxide were mixed uniformly, and stirred at 100-120 r / min and 60-80 °C, and p-phenylenediamine was added, and reacted for 2-3 h to prepare a hydrogen-bonding monomer;

[0010] Step A2: ethyl acrylate, butadiene, dimethyl sulfoxide and acryloyl glycine amide were mixed uniformly, and stirred at 150-200 r / min and 50-70 °C, and sodium dodecylbenzenesulfonate and potassium persulfate were added, and reacted for 8-10 h to prepare a chain copolymer. The chain copolymer, tetrahydrofuran, 4-dimethylaminopyridine and the hydrogen-bonding monomer were mixed uniformly, and protected by nitrogen, and reacted at 150-200 r / min and 20-30 °C for 2-3 h to prepare a hydrogen-bonding copolymer.

[0011] Step A3: the hydrogen-bonding copolymer, mercaptotriethoxysilane, benzoin dimethyl ether and tetrahydrofuran were mixed uniformly, and reacted at 100-120 r / min and 20-25 °C under the condition of 4000-4500 μW / cm 2 of ultraviolet light intensity for 30-45 s to obtain a modified polymer.

[0012] Further, the molar ratio of 2,7-naphthyridin-l-amine to hexamethylene diisocyanate in step Al is 1:3, and the molar ratio of isocyanate groups on the urea compound to amino groups on p-phenylenediamine is 1:2.

[0013] Further, the amount ratio of ethyl acrylate, butadiene, acryloyl glycine amide, sodium dodecylbenzenesulfonate and potassium persulfate in step A2 is 1.2 mmol: 1 mmol: 2 mmol: 20 mg: 15 mg, the molar ratio of ester groups on the chain copolymer to amino groups on the hydrogen-bonding monomer is 1:1, and the amount of 4-dimethylaminopyridine is 3-7% of the mass of the chain copolymer.

[0014] Further, the molar ratio of carbon-carbon double bonds on the hydrogen-bonding copolymer to mercapto groups on mercaptotriethoxysilane in step A3 is 1:1.5, and the amount of benzoin dimethyl ether is 2-5% of the mass of the hydrogen-bonding copolymer.

[0015] Further, the modified filler is prepared by the following steps:

[0016] Step B1: Zinc nitrate, methanol, and 2-methylimidazole are mixed evenly and reacted at 150-200 r / min and 100-120℃ for 4-6 hours to obtain zinc-based filler. Copper nitrate, N,N-dimethylformamide, and trimesic acid are mixed evenly and stirred at 150-200 r / min and 100-120℃. The zinc-based filler is then added and reacted for 10-12 hours. After cooling to room temperature, the composite metal filler is obtained.

[0017] Step B2: Mix the composite metal filler, tetraethyl orthosilicate and ethanol evenly, and stir and add γ-methacryloyloxypropyltrimethoxysilane under the conditions of 150-200 r / min, pH 5-6 and temperature 60-70℃, and react for 15-20 h to obtain the pretreated filler.

[0018] Step B3: Mix the pretreated filler, mercaptotriethoxysilane, benzoin dimethyl ether, and tetrahydrofuran evenly, at a speed of 100-120 r / min, a temperature of 20-25℃, and an ultraviolet light intensity of 4000-4500 μW / cm². 2 Under these conditions, the reaction is carried out for 15-20 minutes to obtain the modified filler.

[0019] Furthermore, in step B1, the molar ratio of zinc nitrate to 2-methylimidazole is 1:4, and the ratio of copper nitrate, trimesic acid, and zinc-based filler is 2 mmol:1 mmol:310 mg.

[0020] Furthermore, the ratio of the composite metal filler, tetraethyl orthosilicate, and γ-methacryloyloxypropyltrimethoxysilane used in step B2 is 280 mg: 4 mmol: 1 mmol.

[0021] Furthermore, the ratio of the pretreatment filler, mercaptotriethoxysilane, and benzoin dimethyl ether used in step B3 is 2 mmol:1 mmol:170 mg.

[0022] The beneficial effects of the present invention: The toughened sealing ring material prepared by the present invention includes the following raw materials: modified polymer, modified filler, carbon black, plasticizer, stearic acid and zinc oxide. After uniform mixing, the mixture is melt-extruded to obtain a blend. The blend is soaked in deionized water, and the siloxane on the modified polymer and modified filler is hydrolyzed to generate silanol groups, forming Si-O-Si bonds, thus obtaining the toughened sealing ring material.

[0023] Modified polymer: The amino group on 2,7-naphthidine-1-amine reacts with the isocyanate group on hexamethylene diisocyanate to prepare a urea compound, which then reacts with the amino group on p-phenylenediamine to prepare a hydrogen-bonded monomer. The carbon-carbon double bonds on ethyl acrylate, butadiene, and acryloylglycine are copolymerized under the action of an initiator to prepare a chain copolymer. The amino group on the hydrogen-bonded monomer molecular chain undergoes a nucleophilic substitution reaction with the ester group on the chain copolymer to generate an amide group, thus preparing a hydrogen-bonded copolymer. The mercapto group on mercaptotriethoxysilane and the carbon-carbon double bond on the hydrogen-bonded copolymer molecular chain undergo free radical addition under photoinitiation to prepare a modified polymer.

[0024] Modified filler: Zinc nitrate and 2-methylimidazole dissociate in methanol solvent. The lone pair electrons of zinc ions and imidazole ligands are connected by coordinate bonds to form a core metal-organic framework. Copper nitrate and trimesic acid dissociate in N,N-dimethylformamide solvent. The lone pair electrons of copper ions and carboxyl ligands are connected by coordinate bonds to form a shell metal-organic framework. Tetraethyl orthosilicate is added to form a silica network, which is embedded and coated with the bimetallic organic framework to obtain a pretreated filler. The carbon-carbon double bonds on the pretreated filler undergo free radical addition with the mercapto groups on mercaptotriethoxysilane under photoinitiated conditions to obtain a modified filler.

[0025] Siloxane hydrolysis grafting onto modified polymers and fillers increases the number of crosslinking sites, preventing rapid crack propagation, forcing crack paths to deflect or branch, and increasing fracture surface energy, thereby improving the mechanical properties of the material. Modified polymers prepared by grafting amino and carbonyl chain copolymers with intramolecular hydrogen-bonded structures onto hydrogen-bonded monomers form intermolecular hydrogen bonds, promoting the construction of nanodomains with multiple hydrogen-bonded structures on the molecular chains. These nanodomains not only act as crosslinking agents between molecular chains but also absorb a large amount of energy when the material is subjected to external stress due to the disruption of their internal hydrogen bond structures, providing high toughness. Copper / zinc bimetallic organic frameworks and silica networks form a nanoscale hierarchical porous structure that can be uniformly dispersed in the matrix material. As a nano-reinforcing phase, it effectively hinders crack propagation and the shedding of wear particles, and reduces the coefficient of friction. The bimetallic nodes form dynamic bonds, synergistically improving the mechanical properties of the material. Detailed Implementation

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1: A method for preparing a toughened sealing ring material, specifically including the following steps:

[0028] Weigh the following raw materials in parts by weight: 100 parts modified polymer, 20 parts modified filler, 20 parts carbon black, 15 parts plasticizer, 5 parts stearic acid, and 5 parts zinc oxide. Melt and knead the raw materials at a speed of 50 r / min and a temperature of 110℃ for 5 min to obtain a blend. Immerse the blend in deionized water at a temperature of 20℃ for 2 h. After drying and curing, toughened sealing ring material is obtained.

[0029] The plasticizer is a mixture of dioctyl phthalate and octyl epoxide fatty acid in a mass ratio of 1.3:2.

[0030] The modified polymer is prepared by the following steps:

[0031] Step A1: 2,7-Naphtho-1-amine, hexamethylene diisocyanate and dimethyl sulfoxide are mixed evenly and reacted for 16 h at a speed of 100 r / min, a temperature of 100 °C and a nitrogen atmosphere to obtain a urea compound. The urea compound and dimethyl sulfoxide are mixed evenly and stirred at a speed of 100 r / min and a temperature of 60 °C, and p-phenylenediamine is added. The reaction is carried out for 2 h to obtain a hydrogen-bonded monomer.

[0032] Step A2: Ethyl acrylate, butadiene, dimethyl sulfoxide, and acryloylglycine are mixed evenly. Under the conditions of 150 r / min and 50°C, sodium dodecylbenzenesulfonate and potassium persulfate are added and the mixture is stirred for 8 h to obtain a chain copolymer. The chain copolymer, tetrahydrofuran, 4-dimethylaminopyridine, and hydrogen-bonded monomer are mixed evenly and nitrogen gas is introduced for protection. The mixture is then reacted for 2 h at 150 r / min and 20°C to obtain a hydrogen-bonded copolymer.

[0033] Step A3: Mix the hydrogen-bonded copolymer, mercaptotriethoxysilane, benzoin dimethyl ether, and tetrahydrofuran until homogeneous, at a rotation speed of 100 r / min, a temperature of 20℃, and an ultraviolet light intensity of 4000 μW / cm². 2 Under certain conditions, the reaction was carried out for 30 seconds to obtain the modified polymer.

[0034] The molar ratio of 2,7-naphthidine-1-amine and hexamethylene diisocyanate in step A1 is 1:3, and the molar ratio of isocyanate group on the urea compound to amino group on p-phenylenediamine is 1:2.

[0035] The ratio of ethyl acrylate, butadiene, acryloylglycine, sodium dodecylbenzenesulfonate and potassium persulfate in step A2 is 1.2 mmol:1 mmol:2 mmol:20 mg:15 mg, the molar ratio of ester group on the chain copolymer to amino group on the hydrogen bonded monomer is 1:1, and the amount of 4-dimethylaminopyridine is 3% of the mass of the chain copolymer.

[0036] The molar ratio of carbon-carbon double bonds on the hydrogen-bonded copolymer to mercapto groups on mercaptotriethoxysilane in step A3 is 1:1.5, and the amount of benzoin dimethyl ether used is 2% of the mass of the hydrogen-bonded copolymer.

[0037] The modified filler is prepared by the following steps:

[0038] Step B1: Zinc nitrate, methanol, and 2-methylimidazole are mixed evenly and reacted at 150 r / min and 100℃ for 4 h to obtain zinc-based filler. Copper nitrate, N,N-dimethylformamide, and trimesic acid are mixed evenly and stirred at 150 r / min and 100℃, and zinc-based filler is added. After reacting for 10 h, the mixture is cooled to room temperature to obtain composite metal filler.

[0039] Step B2: Mix the composite metal filler, tetraethyl orthosilicate and ethanol evenly, and stir and add γ-methacryloyloxypropyltrimethoxysilane under the conditions of 150 r / min, pH 5 and temperature 60℃, and react for 15 h to obtain the pretreated filler.

[0040] Step B3: Mix the pretreated filler, mercaptotriethoxysilane, benzoin dimethyl ether, and tetrahydrofuran evenly, at a rotation speed of 100 r / min, a temperature of 20℃, and an ultraviolet light intensity of 4000 μW / cm². 2 Under the specified conditions, the reaction was carried out for 15 minutes to obtain the modified filler.

[0041] The molar ratio of zinc nitrate and 2-methylimidazole in step B1 is 1:4, and the ratio of copper nitrate, trimesic acid and zinc-based filler is 2 mmol:1 mmol:310 mg.

[0042] The ratio of the composite metal filler, tetraethyl orthosilicate, and γ-methacryloyloxypropyltrimethoxysilane used in step B2 is 280 mg: 4 mmol: 1 mmol.

[0043] The ratio of the pretreatment filler, mercaptotriethoxysilane and benzoin dimethyl ether used in step B3 is 2 mmol: 1 mmol: 170 mg.

[0044] Example 2, a method for preparing a toughened sealing ring material, specifically includes the following steps:

[0045] Weigh the following raw materials in parts by weight: 110 parts modified polymer, 25 parts modified filler, 25 parts carbon black, 20 parts plasticizer, 7 parts stearic acid, and 7 parts zinc oxide. Melt and knead the raw materials at a speed of 60 r / min and a temperature of 120℃ for 10 min to obtain a blend. Immerse the blend in deionized water at a temperature of 25℃ for 3 h. After drying and curing, toughened sealing ring material is obtained.

[0046] The plasticizer is a mixture of dioctyl phthalate and tricresyl phosphate in a mass ratio of 1.4:1.8.

[0047] The modified polymer is prepared by the following steps:

[0048] Step A1: 2,7-Naphtho-1-amine, hexamethylene diisocyanate and dimethyl sulfoxide are mixed evenly and reacted for 18 h at a speed of 110 r / min, a temperature of 120 °C and a nitrogen atmosphere to obtain a urea compound. The urea compound and dimethyl sulfoxide are mixed evenly and stirred at a speed of 110 r / min and a temperature of 70 °C, and p-phenylenediamine is added. The reaction is carried out for 2.5 h to obtain a hydrogen-bonded monomer.

[0049] Step A2: Ethyl acrylate, butadiene, dimethyl sulfoxide, and acryloylglycine are mixed evenly. Under the conditions of 160 r / min and 60°C, sodium dodecylbenzenesulfonate and potassium persulfate are added and the mixture is stirred for 9 h to obtain a chain copolymer. The chain copolymer, tetrahydrofuran, 4-dimethylaminopyridine, and hydrogen-bonded monomers are mixed evenly and nitrogen gas is introduced for protection. The mixture is then reacted for 2.5 h at 180 r / min and 25°C to obtain a hydrogen-bonded copolymer.

[0050] Step A3: Mix the hydrogen-bonded copolymer, mercaptotriethoxysilane, benzoin dimethyl ether, and tetrahydrofuran until homogeneous, at a rotation speed of 110 r / min, a temperature of 23℃, and an ultraviolet light intensity of 4200 μW / cm². 2 Under the specified conditions, the reaction was carried out for 35 seconds to obtain the modified polymer.

[0051] The molar ratio of 2,7-naphthidine-1-amine and hexamethylene diisocyanate in step A1 is 1:3, and the molar ratio of isocyanate group on the urea compound to amino group on p-phenylenediamine is 1:2.

[0052] The ratio of ethyl acrylate, butadiene, acryloyl glycine, sodium dodecylbenzenesulfonate, and potassium persulfate in step A2 is 1.2 mmol:1 mmol:2 mmol:20 mg:15 mg. The molar ratio of ester groups on the chain copolymer to amino groups on the hydrogen-bonded monomers is 1:1. The amount of 4-dimethylaminopyridine is 4% of the mass of the chain copolymer.

[0053] In step A3, the molar ratio of carbon-carbon double bonds on the hydrogen-bonded copolymer to mercaptotriethoxysilane is 1:1.5, and the amount of benzoin dimethyl ether used is 3% of the mass of the hydrogen-bonded copolymer.

[0054] The modified filler is prepared by the following steps:

[0055] Step B1: Zinc nitrate, methanol, and 2-methylimidazole are mixed evenly and reacted at 170 r / min and 110°C for 5 h to obtain zinc-based filler. Copper nitrate, N,N-dimethylformamide, and trimesic acid are mixed evenly and stirred at 170 r / min and 110°C, and zinc-based filler is added. After reacting for 11 h, the mixture is cooled to room temperature to obtain composite metal filler.

[0056] Step B2: Mix the composite metal filler, tetraethyl orthosilicate and ethanol evenly, and stir and add γ-methacryloyloxypropyltrimethoxysilane under the conditions of 170 r / min, pH 5 and temperature 65℃, and react for 17 h to obtain the pretreated filler.

[0057] Step B3: Mix the pretreated filler, mercaptotriethoxysilane, benzoin dimethyl ether, and tetrahydrofuran evenly, at a rotation speed of 110 r / min, a temperature of 22℃, and an ultraviolet light intensity of 4200 μW / cm². 2 Under the specified conditions, the reaction was carried out for 16 minutes to obtain the modified filler.

[0058] The molar ratio of zinc nitrate and 2-methylimidazole in step B1 is 1:4, and the ratio of copper nitrate, trimesic acid and zinc-based filler is 2 mmol:1 mmol:310 mg.

[0059] The ratio of the composite metal filler, tetraethyl orthosilicate, and γ-methacryloyloxypropyltrimethoxysilane used in step B2 is 280 mg: 4 mmol: 1 mmol.

[0060] The ratio of the pretreatment filler, mercaptotriethoxysilane and benzoin dimethyl ether used in step B3 is 2 mmol: 1 mmol: 170 mg.

[0061] Example 3, a method for preparing a toughened sealing ring material, specifically includes the following steps:

[0062] A method for preparing a toughened sealing ring material specifically includes the following steps:

[0063] Weigh the following raw materials in parts by weight: 120 parts modified polymer, 30 parts modified filler, 30 parts carbon black, 30 parts plasticizer, 10 parts stearic acid, and 10 parts zinc oxide. Melt and knead the raw materials at a speed of 70 r / min and a temperature of 130℃ for 20 min to obtain a blend. Immerse the blend in deionized water at a temperature of 30℃ for 4 h. After drying and curing, toughened sealing ring material is obtained.

[0064] The plasticizer is a mixture of dioctyl phthalate and tricresyl phosphate in a mass ratio of 1.2:1.3.

[0065] The modified polymer is prepared by the following steps:

[0066] Step A1: 2,7-Naphthid-1-amine, hexamethylene diisocyanate and dimethyl sulfoxide are mixed evenly and reacted for 20 h at a speed of 120 r / min, a temperature of 130 °C and a nitrogen atmosphere to obtain a urea compound. The urea compound and dimethyl sulfoxide are mixed evenly and stirred at a speed of 120 r / min and a temperature of 80 °C, and p-phenylenediamine is added and reacted for 3 h to obtain a hydrogen-bonded monomer.

[0067] Step A2: Ethyl acrylate, butadiene, dimethyl sulfoxide, and acryloylglycine are mixed evenly. Under the conditions of 200 r / min and 70°C, sodium dodecylbenzenesulfonate and potassium persulfate are added and the mixture is stirred for 10 h to obtain a chain copolymer. The chain copolymer, tetrahydrofuran, 4-dimethylaminopyridine, and hydrogen-bonded monomer are mixed evenly and nitrogen gas is introduced for protection. The mixture is then reacted for 3 h at 200 r / min and 30°C to obtain a hydrogen-bonded copolymer.

[0068] Step A3: Mix the hydrogen-bonded copolymer, mercaptotriethoxysilane, benzoin dimethyl ether, and tetrahydrofuran until homogeneous, at a rotation speed of 120 r / min, a temperature of 25℃, and an ultraviolet light intensity of 4500 μW / cm². 2 Under certain conditions, the reaction was carried out for 45 seconds to obtain the modified polymer.

[0069] The molar ratio of 2,7-naphthidine-1-amine and hexamethylene diisocyanate in step A1 is 1:3, and the molar ratio of isocyanate group on the urea compound to amino group on p-phenylenediamine is 1:2.

[0070] The ratio of ethyl acrylate, butadiene, acryloyl glycine, sodium dodecylbenzenesulfonate and potassium persulfate in step A2 is 1.2 mmol:1 mmol:2 mmol:20 mg:15 mg, the molar ratio of ester group on the chain copolymer to amino group on hydrogen bonded monomer is 1:1, and the amount of 4-dimethylaminopyridine is 7% of the mass of the chain copolymer.

[0071] The molar ratio of carbon-carbon double bonds on the hydrogen-bonded copolymer to mercapto groups on mercaptotriethoxysilane in step A3 is 1:1.5, and the amount of benzoin dimethyl ether used is 5% of the mass of the hydrogen-bonded copolymer.

[0072] The modified filler is prepared by the following steps:

[0073] Step B1: Zinc nitrate, methanol, and 2-methylimidazole are mixed evenly and reacted at 200 r / min and 120°C for 6 h to obtain zinc-based filler. Copper nitrate, N,N-dimethylformamide, and trimesic acid are mixed evenly and stirred at 200 r / min and 120°C. The zinc-based filler is then added and reacted for 12 h. After cooling to room temperature, the composite metal filler is obtained.

[0074] Step B2: Mix the composite metal filler, tetraethyl orthosilicate and ethanol evenly, and stir and add γ-methacryloyloxypropyltrimethoxysilane under the conditions of 200 r / min, pH 6 and temperature 70℃, and react for 20 h to obtain the pretreated filler.

[0075] Step B3: Mix the pretreated filler, mercaptotriethoxysilane, benzoin dimethyl ether, and tetrahydrofuran evenly, at a rotation speed of 120 r / min, a temperature of 25℃, and an ultraviolet light intensity of 4500 μW / cm². 2 Under the specified conditions, the reaction was carried out for 20 minutes to obtain the modified filler.

[0076] The molar ratio of zinc nitrate and 2-methylimidazole in step B1 is 1:4, and the ratio of copper nitrate, trimesic acid and zinc-based filler is 2 mmol:1 mmol:310 mg.

[0077] The ratio of the composite metal filler, tetraethyl orthosilicate, and γ-methacryloyloxypropyltrimethoxysilane used in step B2 is 280 mg: 4 mmol: 1 mmol.

[0078] The ratio of the pretreatment filler, mercaptotriethoxysilane and benzoin dimethyl ether used in step B3 is 2 mmol: 1 mmol: 170 mg.

[0079] Comparative Example 1: This comparative example does not contain acryloylglycine, but the other steps are the same as in Example 1.

[0080] Comparative Example 2: This comparative example is the same as Example 1, except that the pretreated packing is used instead of the modified packing.

[0081] Comparative Example 3: This comparative example uses composite metal filler instead of modified filler, but the other steps are the same as in Example 1.

[0082] The wear resistance of the sealing ring materials prepared in Examples 1-3 and Comparative Examples 1-3 was tested according to the standard GB / T1689-2014, and the test results are shown in Table 1. The materials were cut into strips with a length of 235 mm, a width of 12.7 mm, and a thickness of 3.2 mm. The rubber wheel had a diameter of 68 mm and a thickness of 12.7 mm. The samples were pre-ground for 20 min and then subjected to a 1.61 km friction test.

[0083] The sealing ring materials prepared in Examples 1-3 and Comparative Examples 1-3 were tested for tensile strength and tensile elongation according to GB / T528-2009. The test results are shown in Table 1. The dumbbell-shaped specimens were cut with a cutter size of IA, and the standard thickness of the narrow part of the specimen was 2 mm.

[0084] The sealing ring materials prepared in Examples 1-3 and Comparative Examples 1-3 were tested for their compressive modulus at 10% strain according to GB / T7759-2009. The test results are shown in Table 1. Method A was used, with a standard specimen and a metal plate lubricated with a lubricant. The standard specimen was a cylinder with a diameter of 29 mm and a height of 12.5 mm.

[0085] Table 1

[0086]

[0087]

[0088] Table 1 shows that the wear resistance of the toughened sealing ring materials prepared in Examples 1-3 is 0.02-0.03 cm. 3 The tensile strength is 38.5-40.8 MPa, the tensile elongation is 728-754%, and the compressive modulus at 10% strain is 21-22 MPa, indicating that the present invention has good toughening effect and mechanical properties.

[0089] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing a toughened sealing ring material, characterized in that: Specifically, the steps include the following: Weigh the following raw materials in parts by weight: 100-120 parts of modified polymer, 20-30 parts of modified filler, 20-30 parts of carbon black, 15-30 parts of plasticizer, 5-10 parts of stearic acid and 5-10 parts of zinc oxide. Melt and knead the raw materials to obtain a blend. Soak the blend in deionized water and dry and cure it to obtain a toughened sealing ring material. The plasticizer is one or more of dioctyl phthalate, tricresyl phosphate and octyl epoxide fatty acid ester in any proportion.

2. The method for preparing a toughened sealing ring material according to claim 1, characterized in that: The modified polymer is prepared by the following steps: Step A1: Mix 2,7-naphthidine-1-amine, hexamethylene diisocyanate and dimethyl sulfoxide evenly and react to obtain a urea compound. Mix the urea compound and dimethyl sulfoxide, stir and add p-phenylenediamine, and react to obtain a hydrogen-bonded monomer. Step A2: Ethyl acrylate, butadiene, dimethyl sulfoxide and acryloylglycine are mixed and stirred, and sodium dodecylbenzenesulfonate and potassium persulfate are added to react and obtain a chain copolymer. The chain copolymer, tetrahydrofuran, 4-dimethylaminopyridine and hydrogen-bonded monomer are mixed evenly and reacted to obtain a hydrogen-bonded copolymer. Step A3: Mix the hydrogen-bonded copolymer, mercaptotriethoxysilane, benzoin dimethyl ether and tetrahydrofuran evenly and react to obtain the modified polymer.

3. The method for preparing a toughened sealing ring material according to claim 2, characterized in that: The molar ratio of 2,7-naphthidine-1-amine and hexamethylene diisocyanate in step A1 is 1:3, and the molar ratio of isocyanate group on the urea compound to amino group on p-phenylenediamine is 1:

2.

4. The method for preparing a toughened sealing ring material according to claim 2, characterized in that: The ratio of ethyl acrylate, butadiene, acryloylglycine, sodium dodecylbenzenesulfonate and potassium persulfate in step A2 is 1.2 mmol:1 mmol:2 mmol:20 mg:15 mg. The molar ratio of ester group on the chain copolymer to amino group on the hydrogen bond monomer is 1:

1. The amount of 4-dimethylaminopyridine is 3-7% of the mass of the chain copolymer.

5. The method for preparing a toughened sealing ring material according to claim 2, characterized in that: The molar ratio of carbon-carbon double bonds on the hydrogen-bonded copolymer to mercapto groups on mercaptotriethoxysilane in step A3 is 1:1.5, and the amount of benzoin dimethyl ether used is 2-5% of the mass of the hydrogen-bonded copolymer.

6. The method for preparing a toughened sealing ring material according to claim 1, characterized in that: The modified filler is prepared by the following steps: Step B1: Zinc nitrate, methanol and 2-methylimidazole are mixed evenly and reacted to obtain zinc-based filler. Copper nitrate, N,N-dimethylformamide and trimesic acid are mixed and stirred and added to zinc-based filler. After reaction, the mixture is cooled to room temperature to obtain composite metal filler. Step B2: Mix and stir the composite metal filler, tetraethyl orthosilicate and ethanol, and add γ-methacryloyloxypropyltrimethoxysilane to react and obtain the pretreated filler. Step B3: Mix the pretreated filler, mercaptotriethoxysilane, benzoin dimethyl ether and tetrahydrofuran evenly and react to obtain the modified filler.

7. The method for preparing a toughened sealing ring material according to claim 6, characterized in that: The molar ratio of zinc nitrate and 2-methylimidazole in step B1 is 1:4, and the ratio of copper nitrate, trimesic acid and zinc-based filler is 2 mmol:1 mmol:310 mg.

8. The method for preparing a toughened sealing ring material according to claim 6, characterized in that: The ratio of the composite metal filler, tetraethyl orthosilicate, and γ-methacryloyloxypropyltrimethoxysilane used in step B2 is 280 mg: 4 mmol: 1 mmol.

9. The method for preparing a toughened sealing ring material according to claim 6, characterized in that: The ratio of the pretreatment filler, mercaptotriethoxysilane and benzoin dimethyl ether used in step B3 is 2 mmol: 1 mmol: 170 mg.

10. A toughened sealing ring material, characterized in that: Prepared according to any one of the preparation methods described in claims 1-9.

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