CN112709820A - Thermoplastic vulcanized elastomer sealing ring - Google Patents
Thermoplastic vulcanized elastomer sealing ring Download PDFInfo
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- CN112709820A CN112709820A CN202011502344.4A CN202011502344A CN112709820A CN 112709820 A CN112709820 A CN 112709820A CN 202011502344 A CN202011502344 A CN 202011502344A CN 112709820 A CN112709820 A CN 112709820A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/102—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by material
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/104—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/04—Thermoplastic elastomer
Abstract
The invention relates to the technical field of sealing rings, in particular to a thermoplastic vulcanized elastomer sealing ring which comprises a first sealing ring, a transition ring and a second sealing ring which are sequentially connected, wherein the transition ring is a concave arc-shaped sealing ring, and the first sealing ring, the transition ring and the second sealing ring are integrally formed by injection molding of a thermoplastic vulcanized elastomer. The special structure of the concave arc-shaped sealing ring between the first sealing ring and the second sealing ring is more beneficial to clamping the thermoplastic vulcanized elastomer sealing ring between the two conveying pipelines, and the sealing effect of the thermoplastic vulcanized elastomer sealing ring on the connection of the conveying pipelines is greatly improved; the first sealing ring, the transition ring and the second sealing ring are combined to be integrally injection-molded by the thermoplastic vulcanized elastomer, and the thermoplastic vulcanized elastomer has high resilience, tensile strength, tearing strength, oil resistance and weather resistance and improves the sealing durability.
Description
Technical Field
The invention relates to the technical field of sealing rings, in particular to a thermoplastic vulcanized elastomer sealing ring.
Background
Most of the existing sealing rings adopt O-shaped sealing rings made of silica gel, nitrile rubber, ethylene propylene diene monomer rubber, styrene butadiene rubber and the like so as to achieve the sealing effect in the connection of conveying pipelines. But because the pipe diameter of the conveying pipeline is larger and the conveying capacity is high, the traditional O-shaped sealing ring is not enough to achieve the lasting sealing effect.
Disclosure of Invention
To overcome the disadvantages and shortcomings of the prior art, it is an object of the present invention to provide a more durable seal for a thermoplastic vulcanizate seal ring.
The purpose of the invention is realized by the following technical scheme: the utility model provides a thermoplasticity vulcanizes elastomer sealing washer, is including the first sealing ring, transition ring and the second sealing ring that connect gradually, the transition ring is concave arc sealing ring, first sealing ring, transition ring and second sealing ring are by the integrative injection moulding of thermoplasticity vulcanizes elastomer.
Preferably, the cross section of the first sealing ring is rectangular, and the inner side corners of the first sealing ring are arranged to be rounded structures.
Preferably, both sides of the transition ring are provided with a rounding structure.
Preferably, the side corners of the second sealing ring close to the transition ring are arranged into a rounded structure; and a first convex tooth and a second convex tooth arranged at an interval with the first convex tooth extend from the outer side wall of the second sealing ring.
Preferably, the ratio of the cross-sectional area of the first tooth to the cross-sectional area of the second tooth is 1.5 to 2: 1.
preferably, the cross section of the first sealing ring is hemispherical, and the inner side surface of the first sealing ring is a smooth surface.
Preferably, the cross section of the second sealing ring is triangular, and the angle of the second sealing ring far away from the transition ring is a right angle.
Preferably, the outer apex of the first seal ring is not flush with the outer side edge of the second seal ring.
Preferably, one side of the transition ring is arranged to be a rounded structure, and the other side of the transition ring is arranged to be an inclined surface.
Preferably, the thermoplastic vulcanized elastomer comprises the following raw materials in parts by weight: 100 parts of reinforced polypropylene, 30-40 parts of ethylene propylene diene monomer, 1-3 parts of dispersant, 3-8 parts of compatilizer, 0.5-2 parts of plasticizer, 3-8 parts of vulcanizing agent and 1-2 parts of vulcanization accelerator.
The invention has the beneficial effects that: according to the thermoplastic vulcanized elastomer sealing ring, the special structure of the concave arc-shaped sealing ring between the first sealing ring and the second sealing ring is more beneficial to clamping the thermoplastic vulcanized elastomer sealing ring between the two conveying pipelines, so that the sealing effect of the thermoplastic vulcanized elastomer sealing ring on the conveying pipelines is greatly improved; the first sealing ring, the transition ring and the second sealing ring are combined to be integrally injection-molded by the thermoplastic vulcanized elastomer, and the thermoplastic vulcanized elastomer has high resilience, tensile strength, tearing strength, oil resistance and weather resistance and improves the sealing durability.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is an enlarged view of A in FIG. 2;
FIG. 4 is a schematic structural diagram of another embodiment of the present invention;
FIG. 5 is a cross-sectional view of FIG. 4;
fig. 6 is an enlarged view of B in fig. 5.
The reference signs are: 1. a first seal ring; 2. a transition ring; 3. a second seal ring; 4. a first lobe; 5. and a second tooth.
Detailed Description
For the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.
As shown in fig. 1 to 6, in an exemplary embodiment of the present application, a thermoplastic vulcanizate seal ring is provided, which includes a first seal ring 1, a transition ring 2, and a second seal ring 3 connected in sequence, where the transition ring 2 is a concave arc-shaped seal ring, and the first seal ring 1, the transition ring 2, and the second seal ring 3 are integrally injection-molded from a thermoplastic vulcanizate.
According to the thermoplastic vulcanized elastomer sealing ring, the special structure of the concave arc-shaped sealing ring between the first sealing ring 1 and the second sealing ring 3 is more beneficial to clamping the thermoplastic vulcanized elastomer sealing ring between two conveying pipelines, so that the sealing effect of the thermoplastic vulcanized elastomer sealing ring on the connection of the conveying pipelines is greatly improved; the first sealing ring 1, the transition ring 2 and the second sealing ring 3 are combined to be formed by integrally injection molding the thermoplastic vulcanized elastomer, and the thermoplastic vulcanized elastomer has high resilience, tensile strength, tearing strength, oil resistance and weather resistance and improves the sealing durability together.
As shown in fig. 1-3, in one embodiment, the cross-section of the first sealing ring 1 is rectangular and the inner corners of the first sealing ring 1 are arranged in a rounded configuration.
By adopting the technical scheme, when the sealing device is used, the inner side surface of the first sealing ring 1 is smooth, has enough area for fitting and tightly abuts against the outer wall of a conveying pipeline, the inner side corner of the first sealing ring 1 is set into a fillet structure, and the phenomenon that the stress is too concentrated to cause self cracking and reduce the sealing durability when the thermoplastic vulcanized elastomer sealing ring is pressed and sealed is avoided.
In one embodiment, both sides of the transition ring 2 are provided with a rounded configuration.
By adopting the technical scheme, the thermoplastic vulcanized elastomer sealing ring is more favorably clamped between the two conveying pipelines, and the sealing effect of the thermoplastic vulcanized elastomer sealing ring on the connection of the conveying pipelines is greatly improved.
In one embodiment, the second seal ring 3 is disposed in a rounded configuration proximate to the side corners of the transition ring 2; the outer side wall of the second sealing ring 3 extends with a first convex tooth 4 and a second convex tooth 5 which is arranged at a distance from the first convex tooth 4.
By adopting the technical scheme, the side corner of the second sealing ring 3 close to the transition ring 2 is arranged into a fillet structure, so that the phenomenon that the sealing durability of the thermoplastic vulcanized elastomer sealing ring is reduced due to self cracking caused by too concentrated stress when the sealing ring is pressed and sealed is avoided. During the use, first dogtooth 4 and second dogtooth 5 act on another pipeline's inner wall jointly, form double seal, improve sealed stability greatly.
In one embodiment, the ratio of the cross-sectional area of the first tooth 4 to the cross-sectional area of the second tooth 5 is 1.5-2: 1.
by adopting the technical scheme, when the device is used, one surface of the first convex tooth 4, which is far away from the second convex tooth 5, is contacted with the outside air, one surface of the second convex tooth 5, which is far away from the first convex tooth 4, is contacted with the conveying fluid of the conveying pipeline, and the ratio of the cross sectional area of the first convex tooth 4 to the cross sectional area of the second convex tooth 5 is 1.5-2: 1, second lobe 5 cushions earlier and blocks the conveying fluid and get into the space of first lobe 4 and the 5 intervals of second lobe, forms double seal, improves sealing stability greatly. Preferably, the ratio of the cross-sectional area of the first tooth 4 to the cross-sectional area of the second tooth 5 is 1.8: 1.
in another embodiment, as shown in fig. 4-6, the cross section of the first sealing ring 1 is hemispherical, and the inner side surface of the first sealing ring 1 is a smooth surface.
By adopting the technical scheme, when the sealing device is used, the inner side surface of the first sealing ring 1 is smooth and has enough area to be attached and tightly abutted against the outer wall of the conveying pipeline; the cross section of the first sealing ring 1 is hemispherical, so that the phenomenon that the sealing durability is reduced due to self cracking caused by over concentrated stress when the thermoplastic vulcanized elastomer sealing ring is pressed for sealing is avoided.
In another embodiment, the cross section of the second sealing ring 3 is triangular, and the angle of the second sealing ring 3 far away from the transition ring 2 is a right angle; the outer apex of the first seal ring 1 is not flush with the outer edge of the second seal ring 3. Specifically, the outer apex of the first seal ring 1 is 2-3mm, preferably 2.5mm, lower than the outer edge of the second seal ring 3.
Adopt above-mentioned technical scheme, during the use, the one side contact outside air of first sealing ring 1 is kept away from to second sealing ring 3, and first sealing ring 1 contacts pipeline's conveying fluid, and first sealing ring 1 cushions earlier and blocks conveying fluid and gets into the space between second sealing ring 3 and the first sealing ring 1, forms double seal, improves sealing stability greatly.
In another embodiment, one side of the transition ring 2 is provided with a rounded structure, and the other side of the transition ring 2 is provided with an inclined surface.
By adopting the technical scheme, the special structure of the concave arc-shaped sealing ring between the first sealing ring 1 and the second sealing ring 3 forms a buffer zone, so that the thermoplastic vulcanized elastomer sealing ring is more favorably clamped between the two conveying pipelines, and the sealing effect of the thermoplastic vulcanized elastomer sealing ring on the connection of the conveying pipelines is greatly improved.
In one embodiment, the thermoplastic vulcanizate comprises the following raw materials in parts by weight: 100 parts of reinforced polypropylene, 30-40 parts of ethylene propylene diene monomer, 1-3 parts of dispersant, 3-8 parts of compatilizer, 0.5-2 parts of plasticizer, 3-8 parts of vulcanizing agent and 1-2 parts of vulcanization accelerator.
By adopting the technical scheme, the reinforced polypropylene and the ethylene propylene diene monomer are taken as main raw materials, the ethylene propylene diene monomer, the dispersing agent, the compatilizer, the plasticizer, the vulcanizing agent and the vulcanization accelerator are added for dynamic vulcanization, the obtained thermoplastic vulcanized elastomer realizes high vulcanization crosslinking, the crosslinked ethylene propylene diene monomer is dispersed into fine particles under the action of the dispersing agent to form the crosslinked ethylene propylene diene monomer which is distributed in a reinforced polypropylene sea phase in small islands and independently wrapped and protected by the reinforced polypropylene, the compatibility of the reinforced polypropylene and the crosslinked ethylene propylene diene monomer is improved by combining the compatilizer, although inorganic filler is not contained for blending modification, the thermoplastic vulcanized elastomer can have the reprocessing performance and the processing flexibility of the polypropylene, and simultaneously has the elastic sealing performance of rubber, higher rebound resilience, tensile strength, tearing strength, Oil resistance and weather resistance, and the density is lower than that of the traditional silicon rubber, and the special structural design of the invention is combined to improve the sealing durability.
In one embodiment, the preparation method of the reinforced polypropylene comprises the following steps: taking bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-phthalic diamide and ethanol according to the weight ratio of 1: 1: 2-5, uniformly mixing to obtain a modifier; soaking polypropylene in a modifier, ultrasonically stirring at the frequency of 6000-8000Hz for 10-20min, taking out, and drying at 60 ℃ for 15-30min to obtain the reinforced polypropylene.
By adopting the technical scheme, the modifier obtained by adding bis (2, 4-dicumylphenyl) pentaerythritol diphosphite and N, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-benzenedicarboxamide into ethanol for blending and diluting is combined with the polypropylene under ultrasonic stirring, so that the obtained reinforced polypropylene has higher thermal stability, and the influence on the overall physical properties of the thermoplastic vulcanized elastomer due to thermal decomposition in the vulcanization process is avoided. Further, the polypropylene is formed by mixing homo-polypropylene and random co-polypropylene according to the weight ratio of 3:1-3, and the melt index of the homo-polypropylene is 3-6g/10min under the conditions that the temperature is 230 ℃ and the pressure load is 2.16 kg; the melt index of the random copolymerization polypropylene under the conditions that the temperature is 230 ℃ and the pressure load is 2.16kg is 6.5-9.5g/10 min; the homopolypropylene and the random copolymerization polypropylene are mixed according to a specific proportion, the wear resistance, the toughness and the aging resistance of the thermoplastic vulcanized elastomer are improved under the combined action of the homopolypropylene and the random copolymerization polypropylene, and the shrinkage rate of the polypropylene is reduced and the hardness of the polypropylene can be maintained by adding the random copolymerization polypropylene.
In one embodiment, the dispersant is 420P and FC-608 mixed in a weight ratio of 3: 1-2; the compatilizer is EBS, EMA or ABS-G-GMA.
By adopting the technical scheme, the dispersing agent compounded by 420P and FC-608 according to a specific proportion acts on a system, so that the ethylene propylene diene monomer rubber is dispersed into a plurality of independent individuals in the system, the average particle size is ensured to be less than 1 mu m, and the compatilizer is added to ensure that the compatibility of the reinforced polypropylene and the crosslinked ethylene propylene diene monomer rubber is better, so that the tensile strength and the tear strength of the thermoplastic vulcanized elastomer are improved.
In one embodiment, the ethylene-propylene-diene monomer has a Mooney viscosity ML (1+4) at 125 ℃ of 19 to 50, an ethylene content of 50 to 71 wt.%, and an ENB content of 3.8 to 5.0 wt.%.
By adopting the technical scheme, the thermoplastic vulcanized elastomer obtained by adding the specific ethylene propylene diene monomer has better wear resistance, oil resistance and elastic effect.
In one embodiment, the plasticizer is dioctyl adipate or di (2-ethylhexyl) sebacate.
By adopting the technical scheme, the mobility of molecular bonds of the resin is increased, the crystallinity of the resin molecules is reduced, the plasticity of the resin molecules is increased, the flexibility of the resin molecules is enhanced, and the resin is easy to process.
In one embodiment, the vulcanizing agent is at least one of tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide, dipentamethylenethiuram tetrasulfide, dipentamethylenethiuram disulfide, dimethyldiphenylthiuram disulfide, diethyldiphenylthiuram disulfide, dipentamethylenethiuram hexasulfide, dimorphine disulfide, and dimorphine tetrasulfide; the vulcanization accelerator is N-tertiary butyl-2-benzothiazole sulfonamide or dibenzothiazyl disulfide.
By adopting the technical scheme, the vulcanization reaction and vulcanization promoting effect are improved, and the tensile strength and the tearing strength of the thermoplastic vulcanized elastomer are further improved.
In one embodiment, the method of preparing the thermoplastic vulcanizate includes the steps of:
(S1) uniformly mixing the reinforced polypropylene, the ethylene propylene diene monomer, the dispersant, the compatilizer, the plasticizer, the vulcanizing agent and the vulcanization accelerator according to the parts by weight to obtain a mixture;
(S2) feeding the mixture into a double-screw extruder for melting, extruding, dynamically crosslinking and granulating to obtain the thermoplastic vulcanized elastomer;
wherein the rotating speed of the screw of the double-screw extruder is 100-120r/min, the length-diameter ratio of the screw is 30-40:1, and the temperature of each zone of the double-screw extruder is set as follows: the first zone is 160-165 ℃, the second zone is 165-170 ℃, the third zone is 170-175 ℃, the fourth zone is 170-175 ℃, the fifth zone is 170-180 ℃, and the die head temperature is 165-170 ℃. The thermoplastic vulcanized elastomer finally reaches the positive vulcanization stage and is discharged, and the raw materials are fully reacted.
The preparation method of the thermoplastic vulcanized elastomer is simple to operate, convenient to control, high in production efficiency and low in production cost, and can be used for large-scale production.
Example 1
As shown in fig. 1-3, a thermoplastic vulcanized elastomer sealing ring comprises a first sealing ring 1, a transition ring 2 and a second sealing ring 3 which are connected in sequence, wherein the transition ring 2 is a concave arc-shaped sealing ring, and the first sealing ring 1, the transition ring 2 and the second sealing ring 3 are formed by integrally injection molding a thermoplastic vulcanized elastomer.
In this embodiment, the cross section of the first sealing ring 1 is rectangular and the inner corners of the first sealing ring 1 are rounded.
In the present embodiment, both sides of the transition ring 2 are provided with a rounded structure.
By adopting the technical scheme, the thermoplastic vulcanized elastomer sealing ring is more favorably clamped between the two conveying pipelines, and the sealing effect of the thermoplastic vulcanized elastomer sealing ring on the connection of the conveying pipelines is greatly improved.
In the embodiment, the side corners of the second sealing ring 3 close to the transition ring 2 are arranged in a rounded structure; the outer side wall of the second sealing ring 3 extends with a first convex tooth 4 and a second convex tooth 5 which is arranged at a distance from the first convex tooth 4.
In the present embodiment, the ratio of the cross-sectional area of the first tooth 4 to the cross-sectional area of the second tooth 5 is 1.8: 1.
example 2
This example differs from example 1 in that:
as shown in fig. 4 to 6, in the present embodiment, the cross section of the first sealing ring 1 is hemispherical, and the inner side surface of the first sealing ring 1 is a smooth surface.
In this embodiment, the cross section of the second sealing ring 3 is triangular, and the angle of the second sealing ring 3 away from the transition ring 2 is a right angle; the outer apex of the first seal ring 1 is not flush with the outer edge of the second seal ring 3. Specifically, the outer apex of the first seal ring 1 is 2.5mm lower than the outer side edge of the second seal ring 3.
In the present embodiment, one side of the transition ring 2 is configured as a rounded structure, and the other side of the transition ring 2 is configured as an inclined surface.
Example 3
This example differs from example 1 in that:
the thermoplastic vulcanized elastomer comprises the following raw materials in parts by weight: 100 parts of reinforced polypropylene, 35 parts of ethylene propylene diene monomer, 2 parts of dispersant, 5 parts of compatilizer, 1 part of plasticizer, 5 parts of vulcanizing agent and 1.5 parts of vulcanization accelerator.
The preparation method of the reinforced polypropylene comprises the following steps: taking bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-phthalic diamide and ethanol according to the weight ratio of 1: 1: 3, uniformly mixing to obtain a modifier; soaking polypropylene in a modifier, then ultrasonically stirring for 15min at the frequency of 7000Hz, taking out and drying for 22min at the temperature of 60 ℃ to obtain the reinforced polypropylene.
The polypropylene is formed by mixing homo-polypropylene and random copolymerization polypropylene according to the weight ratio of 3:2, and the melt index of the homo-polypropylene is 4g/10min under the conditions that the temperature is 230 ℃ and the pressure load is 2.16 kg; the melt index of the random copolymerization polypropylene under the conditions of 230 ℃ and 2.16kg of pressure load is 8g/10 min.
The dispersant is formed by mixing 420P and FC-608 according to the weight ratio of 3: 1.5; the compatilizer is EBS.
The ethylene propylene diene monomer is selected from Dow 4725P.
The plasticizer is dioctyl adipate.
The vulcanizing agent is tetramethyl thiuram disulfide; the vulcanization accelerator is N-tertiary butyl-2-benzothiazole sulfonamide.
The preparation method of the thermoplastic vulcanized elastomer comprises the following steps:
(S1) uniformly mixing the reinforced polypropylene, the ethylene propylene diene monomer, the dispersant, the compatilizer, the plasticizer, the vulcanizing agent and the vulcanization accelerator according to the parts by weight to obtain a mixture;
(S2) feeding the mixture into a double-screw extruder for melting, extruding, dynamically crosslinking and granulating to obtain the thermoplastic vulcanized elastomer;
the rotating speed of a screw of the double-screw extruder is 110r/min, the length-diameter ratio of the screw is 35:1, and the temperature of each zone of the double-screw extruder is set as follows: the first zone was 162 deg.C, the second zone was 168 deg.C, the third zone was 172 deg.C, the fourth zone was 172 deg.C, the fifth zone was 175 deg.C, and the die temperature was 168 deg.C.
Example 4
This example differs from example 1 in that:
the thermoplastic vulcanized elastomer comprises the following raw materials in parts by weight: 100 parts of reinforced polypropylene, 30 parts of ethylene propylene diene monomer, 1 part of dispersant, 3 parts of compatilizer, 0.5 part of plasticizer, 3 parts of vulcanizing agent and 1 part of vulcanization accelerator.
The preparation method of the reinforced polypropylene comprises the following steps: taking bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-phthalic diamide and ethanol according to the weight ratio of 1: 1: 2, uniformly mixing to obtain a modifier; soaking polypropylene in a modifier, ultrasonically stirring at 6000Hz for 20min, taking out, and drying at 60 ℃ for 15min to obtain the reinforced polypropylene.
The polypropylene is formed by mixing homo-polypropylene and random copolymerization polypropylene according to the weight ratio of 3:1, and the melt index of the homo-polypropylene is 3g/10min under the conditions that the temperature is 230 ℃ and the pressure load is 2.16 kg; the melt index of the random copolymerization polypropylene under the conditions of 230 ℃ and 2.16kg of pressure load is 6.5g/10 min.
The dispersant is formed by mixing 420P and FC-608 according to the weight ratio of 3: 1; the compatilizer is EMA.
The ethylene propylene diene monomer is selected from Dow 1520.
The plasticizer is sebacic acid di (2-ethylhexyl) ester.
The vulcanizing agent is diethyl diphenyl thiuram disulfide; the vulcanization accelerator is dibenzothiazyl disulfide.
The preparation method of the thermoplastic vulcanized elastomer comprises the following steps:
(S1) uniformly mixing the reinforced polypropylene, the ethylene propylene diene monomer, the dispersant, the compatilizer, the plasticizer, the vulcanizing agent and the vulcanization accelerator according to the parts by weight to obtain a mixture;
(S2) feeding the mixture into a double-screw extruder for melting, extruding, dynamically crosslinking and granulating to obtain the thermoplastic vulcanized elastomer;
the rotating speed of a screw of the double-screw extruder is 100r/min, the length-diameter ratio of the screw is 30:1, and the temperature of each zone of the double-screw extruder is set as follows: 160 ℃ in the first zone, 165 ℃ in the second zone, 170 ℃ in the third zone, 170 ℃ in the fourth zone, 180 ℃ in the fifth zone and 165 ℃ in the die head.
Example 5
This example differs from example 1 in that:
the thermoplastic vulcanized elastomer comprises the following raw materials in parts by weight: 100 parts of reinforced polypropylene, 40 parts of ethylene propylene diene monomer, 3 parts of dispersant, 8 parts of compatilizer, 2 parts of plasticizer, 8 parts of vulcanizing agent and 2 parts of vulcanization accelerator.
The preparation method of the reinforced polypropylene comprises the following steps: taking bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-phthalic diamide and ethanol according to the weight ratio of 1: 1: 5, uniformly mixing to obtain a modifier; soaking polypropylene in a modifier, then ultrasonically stirring for 10min at the frequency of 8000Hz, taking out and drying for 30min at the temperature of 60 ℃ to obtain the reinforced polypropylene.
The polypropylene is formed by mixing homo-polypropylene and random copolymerization polypropylene according to the weight ratio of 3:3, and the melt index of the homo-polypropylene is 6g/10min under the conditions that the temperature is 230 ℃ and the pressure load is 2.16 kg; the melt index of the random copolymerization polypropylene under the conditions of 230 ℃ and 2.16kg of pressure load is 9.5g/10 min.
The dispersant is formed by mixing 420P and FC-608 according to the weight ratio of 3: 2; the compatilizer is ABS-G-GMA.
The ethylene propylene diene monomer is selected from Exxon Mobil 2504N.
The plasticizer is sebacic acid di (2-ethylhexyl) ester.
The vulcanizing agent is dipentamethylenethiuram hexasulfide; the vulcanization accelerator is dibenzothiazyl disulfide or dibenzothiazyl disulfide.
The preparation method of the thermoplastic vulcanized elastomer comprises the following steps:
(S1) uniformly mixing the reinforced polypropylene, the ethylene propylene diene monomer, the dispersant, the compatilizer, the plasticizer, the vulcanizing agent and the vulcanization accelerator according to the parts by weight to obtain a mixture;
(S2) feeding the mixture into a double-screw extruder for melting, extruding, dynamically crosslinking and granulating to obtain the thermoplastic vulcanized elastomer;
wherein the rotating speed of the screw of the double-screw extruder is 120r/min, the length-diameter ratio of the screw is 40:1, and the temperature of each zone of the double-screw extruder is set as follows: first zone 165 ℃, second zone 170 ℃, third zone 175 ℃, fourth zone 175 ℃, fifth zone 170 ℃ and die temperature 170 ℃.
Example 6
This example differs from example 1 in that:
the thermoplastic vulcanized elastomer comprises the following raw materials in parts by weight: 100 parts of reinforced polypropylene, 38 parts of ethylene propylene diene monomer, 2.5 parts of dispersant, 4 parts of compatilizer, 0.8 part of plasticizer, 4 parts of vulcanizing agent and 1.8 parts of vulcanization accelerator.
The preparation method of the reinforced polypropylene comprises the following steps: taking bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-phthalic diamide and ethanol according to the weight ratio of 1: 1: 4, uniformly mixing to obtain a modifier; soaking polypropylene in a modifier, then ultrasonically stirring for 18min at the frequency of 6500Hz, taking out, and drying for 18min at the temperature of 60 ℃ to obtain the reinforced polypropylene.
The polypropylene is formed by mixing homo-polypropylene and random copolymerization polypropylene according to the weight ratio of 3:1.8, and the melt index of the homo-polypropylene is 5g/10min under the conditions that the temperature is 230 ℃ and the pressure load is 2.16 kg; the melt index of the random copolymerization polypropylene under the conditions of 230 ℃ and 2.16kg of pressure load is 9g/10 min.
The dispersant is formed by mixing 420P and FC-608 according to the weight ratio of 3: 1.8; the compatilizer is EBS.
The ethylene propylene diene monomer is selected from Dow 1520.
The plasticizer is dioctyl adipate.
The vulcanizing agent is tetraethylthiuram disulfide; the vulcanization accelerator is N-tertiary butyl-2-benzothiazole sulfonamide.
The preparation method of the thermoplastic vulcanized elastomer comprises the following steps:
(S1) uniformly mixing the reinforced polypropylene, the ethylene propylene diene monomer, the dispersant, the compatilizer, the plasticizer, the vulcanizing agent and the vulcanization accelerator according to the parts by weight to obtain a mixture;
(S2) feeding the mixture into a double-screw extruder for melting, extruding, dynamically crosslinking and granulating to obtain the thermoplastic vulcanized elastomer;
wherein the rotating speed of the screw of the double-screw extruder is 110r/min, the length-diameter ratio of the screw is 33:1, and the temperature of each zone of the double-screw extruder is set as follows: first zone 165 ℃, second zone 166 ℃, third zone 175 ℃, fourth zone 175 ℃, fifth zone 178 ℃, die temperature 168 ℃.
Comparative example 1
This comparative example differs from example 3 in that:
the thermoplastic vulcanizate is free of a compatibilizer.
Comparative example 2
This comparative example differs from example 3 in that:
the dispersing agent is ethylene bis stearamide.
Comparative example 3
This comparative example differs from example 3 in that:
the dispersant is 420P.
Comparative example 4
This comparative example differs from example 3 in that:
the reinforced polypropylene is replaced by polypropylene.
Comparative example 5
This comparative example differs from example 3 in that:
the reinforced polypropylene is replaced by random copolymerization polypropylene, and the melt index of the random copolymerization polypropylene under the conditions of the temperature of 230 ℃ and the pressure load of 2.16kg is 8g/10 min.
Example 7
The thermoplastic vulcanizate prepared in examples 3-6 and comparative examples 1-5 were tested for tensile strength, tear strength, compression set and weatherability as follows:
tensile strength: according to the regulation of GB/T528-2009, the sample is an A-ring sample, and the tensile strength of the A-ring sample is tested and is in MPa.
Tear strength: the test is carried out according to the method A of GB/T529-.
Compression set: the sample was type A according to the provisions of GB/T7759.1-2015, and the compression set was measured in% at 70 ℃ for 22h at 25% compression.
Weather resistance: the sample 168h was irradiated according to the specifications of GB T3511-2018 and GB/T16422.2-2014, and the retention of tensile strength properties in% was tested and calculated.
The test results are shown in table 1 below:
TABLE 1
| Tensile strength | Tear strength | Compression set | Weather resistance | |
| Example 3 | 17.2 | 88.6 | 5 | 98.5 |
| Example 4 | 14.5 | 85 | 8 | 96.2 |
| Example 5 | 17.8 | 88.8 | 4 | 98.9 |
| Example 6 | 16.3 | 86.2 | 5 | 96.7 |
| Comparative example 1 | 12.5 | 76.3 | 12 | 96.8 |
| Comparative example 2 | 8.3 | 64.4 | 15 | 92 |
| Comparative example 3 | 12.7 | 76.9 | 8 | 94.4 |
| Comparative example 4 | 13.2 | 80.1 | 9 | 82.5 |
| Comparative example 5 | 12.8 | 65.2 | 13 | 80.3 |
As can be seen from the above Table 1, the thermoplastic vulcanized elastomer of the present invention has good elastic sealing performance, high resilience, high tensile strength, high tear strength and high weather resistance, and is more favorable for the sealing durability of the sealing ring of the present invention.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (10)
1. A thermoplastic vulcanized elastomer sealing ring is characterized in that: including first sealing ring, transition ring and the second sealing ring that connects gradually, the transition ring is concave arc sealing ring, first sealing ring, transition ring and second sealing ring are by the integrative injection moulding of thermoplasticity vulcanize elastomer.
2. A thermoplastic vulcanizate seal ring according to claim 1, wherein: the cross section of the first sealing ring is rectangular, and the inner side corners of the first sealing ring are arranged to be in a fillet structure.
3. A thermoplastic vulcanizate seal ring according to claim 1, wherein: both sides of the transition ring are provided with rounding structures.
4. A thermoplastic vulcanizate seal ring according to claim 1, wherein: the side corners of the second sealing ring close to the transition ring are arranged into a fillet structure; and a first convex tooth and a second convex tooth arranged at an interval with the first convex tooth extend from the outer side wall of the second sealing ring.
5. The thermoplastic vulcanizate seal ring according to claim 4, wherein: the ratio of the cross-sectional area of the first lobe to the cross-sectional area of the second lobe is 1.5-2: 1.
6. a thermoplastic vulcanizate seal ring according to claim 1, wherein: the cross section of the first sealing ring is hemispherical, and the inner side surface of the first sealing ring is a smooth surface.
7. The seal ring according to claim 6, wherein: the cross section of the second sealing ring is triangular, and the angle of the second sealing ring far away from the transition ring is a right angle.
8. The thermoplastic vulcanizate seal ring according to claim 7, wherein: the outer side vertex of the first sealing ring is not flush with the outer side edge of the second sealing ring.
9. A thermoplastic vulcanizate seal ring according to claim 1, wherein: one side of the transition ring is arranged to be a rounded corner structure, and the other side of the transition ring is arranged to be an inclined plane.
10. A sealing ring according to any one of claims 1-9, characterized in that: the thermoplastic vulcanized elastomer comprises the following raw materials in parts by weight: 100 parts of reinforced polypropylene, 30-40 parts of ethylene propylene diene monomer, 1-3 parts of dispersant, 3-8 parts of compatilizer, 0.5-2 parts of plasticizer, 3-8 parts of vulcanizing agent and 1-2 parts of vulcanization accelerator.
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| TW200730749A (en) * | 2005-09-20 | 2007-08-16 | Bayer Materialscience Llc | Gasket |
| CN102781746A (en) * | 2010-02-05 | 2012-11-14 | 罗伯特·博世有限公司 | Seal |
| CN103635725A (en) * | 2011-05-24 | 2014-03-12 | 保力马科技(日本)株式会社 | Seal member and composite seal member |
| CN107000274A (en) * | 2014-11-28 | 2017-08-01 | 爱尔铃克铃尔股份公司 | Seal and the method for manufacturing seal |
| CN112029200A (en) * | 2020-08-07 | 2020-12-04 | 东风商用车有限公司 | Low-density thermoplastic dynamic vulcanized rubber material and preparation method and application thereof |
| CN214617835U (en) * | 2020-12-17 | 2021-11-05 | 广东安普智信电气有限公司 | Thermoplastic vulcanized elastomer sealing ring |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200730749A (en) * | 2005-09-20 | 2007-08-16 | Bayer Materialscience Llc | Gasket |
| CN102781746A (en) * | 2010-02-05 | 2012-11-14 | 罗伯特·博世有限公司 | Seal |
| CN103635725A (en) * | 2011-05-24 | 2014-03-12 | 保力马科技(日本)株式会社 | Seal member and composite seal member |
| CN107000274A (en) * | 2014-11-28 | 2017-08-01 | 爱尔铃克铃尔股份公司 | Seal and the method for manufacturing seal |
| CN112029200A (en) * | 2020-08-07 | 2020-12-04 | 东风商用车有限公司 | Low-density thermoplastic dynamic vulcanized rubber material and preparation method and application thereof |
| CN214617835U (en) * | 2020-12-17 | 2021-11-05 | 广东安普智信电气有限公司 | Thermoplastic vulcanized elastomer sealing ring |
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Denomination of invention: A Thermoplastic Vulcanized Elastomer Sealing Ring Effective date of registration: 20230406 Granted publication date: 20220621 Pledgee: Ping An Bank Co.,Ltd. Dongguan Branch Pledgor: GUANGDONG ANPU ZHIXIN ELECTRIC Co.,Ltd. Registration number: Y2023980037507 |