CN109627516A - A kind of sealing ring - Google Patents

A kind of sealing ring Download PDF

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Publication number
CN109627516A
CN109627516A CN201811391492.6A CN201811391492A CN109627516A CN 109627516 A CN109627516 A CN 109627516A CN 201811391492 A CN201811391492 A CN 201811391492A CN 109627516 A CN109627516 A CN 109627516A
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CN
China
Prior art keywords
sealing ring
parts
carbon black
molding
nitrile rubber
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Pending
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CN201811391492.6A
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Chinese (zh)
Inventor
郑政宏
王鑫
王群伟
闵炼
叶炎凯
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NINGBO XUTAI RUBBER INDUSTRY Co Ltd
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NINGBO XUTAI RUBBER INDUSTRY Co Ltd
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Priority to CN201811391492.6A priority Critical patent/CN109627516A/en
Publication of CN109627516A publication Critical patent/CN109627516A/en
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/02Copolymers with acrylonitrile
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00Mixing; Kneading
    • B29B7/002Methods
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32Component parts, details or accessories; Auxiliary operations
    • B29C43/58Measuring, controlling or regulating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/76Measuring, controlling or regulating
    • B29C45/77Measuring, controlling or regulating of velocity or pressure of moulding material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/76Measuring, controlling or regulating
    • B29C45/78Measuring, controlling or regulating of temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32Component parts, details or accessories; Auxiliary operations
    • B29C43/58Measuring, controlling or regulating
    • B29C2043/5808Measuring, controlling or regulating pressure or compressing force
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32Component parts, details or accessories; Auxiliary operations
    • B29C43/58Measuring, controlling or regulating
    • B29C2043/5816Measuring, controlling or regulating temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76494Controlled parameter
    • B29C2945/76498Pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76494Controlled parameter
    • B29C2945/76531Temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/26Sealing devices, e.g. packaging for pistons or pipe joints
    • B29L2031/265Packings, Gaskets
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00Specific properties of additives
    • C08K2201/011Nanostructured additives
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00Specific properties of additives
    • C08K2201/014Additives containing two or more different additives of the same subgroup in C08K
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/03Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035Polymer 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Sealing Material Composition (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The present invention relates to a kind of sealing rings, belong to technical field of polymer materials.Sealing ring of the present invention includes the ingredient of following parts by weight: nitrile rubber: 100 parts, carbon black: 40-80 parts, gutta percha: 15-25 parts, isotactic polypropylene: 15-25 parts, polyether plasticizer: 5-15 parts, modified carbon nano-tube: 2-5 parts, coupling agent: 1-3 parts, organic zinc: 2-8 parts, age resister: 6-10 parts, vulcanizing agent: 3-8 parts.Sealing ring of the present invention compounds addition carbon black and the other compositions such as gutta percha and isotactic polypropylene using nitrile rubber as mainly forming, and by reasonable compatibility between each ingredient, high-performance sealed circle is made to have high resiliency and excellent cryogenic property.

Description

A kind of sealing ring
Technical field
The present invention relates to a kind of sealing rings, belong to technical field of polymer materials.
Background technique
Sealing ring is very common very necessary part in life production, except the general requirement that should have sealing ring material Outside, sealing ring is also noted that following requirement: high resilience, excellent wearability;Mechanical strength appropriate, including expansion are strong Degree, elongation and tearing toughness etc.;Performance is stablized, and is not easy to be swollen in the medium, thermal pinch (Joule effect);Easy processing Molding, and it is able to maintain accurate size;Do not corrode contact surface, not pollution medium etc..Meet above-mentioned requirements be most suitable for and also most Common material is rubber, so sealing ring rubber material multi-purpose greatly is made.The various types of rubber, the selection of sealing ring material To its sealing performance and service life important in inhibiting.The performance of material directly affects the service performance of sealing ring.And NBR fourth Sealing ring made of nitrile rubber is suitable for petroleum hydraulic oil, glycol system hydraulic oil, diester-based lubricating oil, gasoline, water, silicon lubrication It is used in the media such as rouge, silicone oil, general use temperature range is -30~120 DEG C, is the rubber that current purposes is most wide, cost is minimum Glue sealing element.Those skilled in the art, which are also constantly dedicated to improving, improves nitrile rubber sealing ring.
Summary of the invention
The present invention for the problems of prior art defect, provide it is a kind of with high resiliency, excellent low temperature properties Sealing ring.
Above-mentioned purpose of the invention can be realized by the following technical scheme: a kind of sealing ring, and the sealing ring includes The ingredient of following parts by weight:
Nitrile rubber: 100 parts
Carbon black: 40-80 parts
Gutta percha: 15-25 parts
Isotactic polypropylene: 15-25 parts
Polyether plasticizer: 5-15 parts
Modified carbon nano-tube: 2-5 parts
Coupling agent: 1-3 parts
Organic zinc: 2-8 parts
Age resister: 6-10 parts
Vulcanizing agent: 3-8 parts.
Sealing ring of the present invention compounds addition carbon black and gutta percha using nitrile rubber as mainly forming, and complete same The other compositions such as vertical structure polypropylene make high-performance sealed circle have high resiliency and excellent by reasonable compatibility between each ingredient Cryogenic property.
Wherein, isotactic polypropylene is polyacrylic one kind, and the methyl in molecule is in the side of main chain, due to butyronitrile Contain-CN functional group in rubber, after isotactic polypropylene is added, there is good compatibility with nitrile rubber, and complete With the vertical polyacrylic addition of structure, the crystallinity formed in sealing ring can be changed, thus destroy itself have it is supramolecular structured Structure, so that the dispersion degree of sealing ring is improved, to enhance the toughness of sealing ring.Furthermore isotactic polypropylene and carbon black There is same hydrogen bond structure with carbon nanotube, this three is added simultaneously, can be improved mutual compatibility.And carbon black (CB) It has good conductive property, has good reinforcing effect to rubber matrix as conductive filler, there is sealing ring obtained Preferable air-tightness, watertightness, pressure sealing, corrosion resistance, also with density is small, elasticity is good, performance is stable, cheap The advantages that.Carbon black granularity is minimum, is filled in rubber matrix and participates in conductive, the electric conductivity of system by the secondary structure reunited By rubber matrix viscosity, the viscosity of rubber, polarity also will affect the dispersion of carbon black in mixing process.And the polarity of matrix with Carbon blacksurface Electronic interactions and the compatibility and dispersion performance that carbon black and matrix can be influenced.Nitrile rubber is polarity Rubber, the polarity carbochain and carbon blacksurface polar molecule group of matrix attract each other to increase the compatibility of matrix and carbon black, Carbon black pellet is attracted in matrix polar molecule chain.Increase with content of carbon black, the secondary structure grain of carbon black in mixing process The shear action that son is subject to constantly increases, and is also increased by the probability of failure by shear, and the secondary structure of carbon black is caused to rupture, so point It dissipates more evenly.Carbon nanotube be diameter be 1-10nm, length is that tens microns of even greater single layers (single wall) or multilayer are (more Wall) graphite cylinder.The chemical composition and atom combining form of carbon nanotube are simple, and single layer is six face shape planar structures, radial For nano-scale, draw ratio is big (100-1000), compound with regular structure, large specific surface area, and intensity is high, preferably heat-resisting with graphite, Corrosion-resistant, heat shock resistance and self-lubrication, biocompatibility, thermal conductance, electrical conductance.But carbon nanotube assembles (entanglement) tendency It is strong with chemical inertness, dispersibility in rubber and limit its application in rubber with the bond properties difference of rubber need to be to carbon Nanotube carries out surface and is modified, and improves dispersibility of the carbon nanotube in rubber.Isotactic polypropylene in sealing ring of the present invention, Carbon nanotube and carbon black and when being used as reinforcing agent, due to the synergistic effect between three, isotactic polypropylene, carbon nanotube and Carbon black becomes " grape cluster " structure of real meaning in rubber matrix, and this structure can be efficiently modified and isotactic poly is applied alone The performance deficiency of sizing material when propylene, carbon nanotube or carbon black, while reducing the resistance that sealing ring uses.By modified carbon nano-tube (CNTs) it is added in black-reinforced filling system nitrile rubber, causes the rubber vulcanization time to extend, improve the state of cure (vulcanization) of sizing material, It can be improved the antistatic property of sizing material, production antistatic property is excellent and the good rubber product of oil resistance.With modification CNTs dosage increases, and hardness, 100% stress at definite elongation and the tearing strength that black-reinforced fills system nitrile rubber become in increase Gesture, tensile strength slowly decline, and elongation rate of tensile failure reduces.The dispersion performance of carbon black is in opposite trend in nitrile rubber, with charcoal Black content increases and improves, therefore comprehensive each factor, is being used in compounding modified carbon nano-tube and carbon black work in sealing ring of the present invention Under the action of reinforcing agent, need to add 15-25 parts of isotactic polypropylenes, 40-80 parts of carbon blacks and 2-5 parts of modified carbon nano-tubes.
In a kind of above-mentioned sealing ring, the content of acrylonitrile is 45-55% in the nitrile rubber.Nitrile rubber is existing excellent Good oil resistivity and physical mechanical property, and there is preferable heat-resisting, weatherability, and the performance of nitrile rubber also with acrylonitrile Content has relationship.
In a kind of above-mentioned sealing ring, the carbon black is the mixture of carbon black N990, carbon black N550, modified white carbon black, The carbon black N990, carbon black N550, modified white carbon black mass ratio be 1-2:2-3:1.Carbon black N990 big, degree of structuration with particle Height fills the characteristics of medium rubber strength and permanent deformation very little, and carbon black N550 is a kind of good carbon black of reinforcing property, can be assigned Give the preferable processability of sizing material, low pressure denaturation and elasticity;It is modified white carbon black wearability, tear-resistant, heat-resist.In the present invention Carbon black N990, carbon black N550, modified white carbon black are used cooperatively, and further increase the reinforcing effect of carbon black, reduce the pressure of sealing ring Compression permanent deformation improves wearability, the resistance to tearing of sealing ring.Further preferably, the carbon black N550 is by maleic acid Acid anhydride is grafted to carbon blacksurface modified carbon black N550.The graft modification of carbon blacksurface is to be grafted upper polymer chain in carbon blacksurface, by It can be firmly bonded to carbon blacksurface in the polymer in the grafting of this method, while stretching, extension provides enough repulsion in water, It is reassembled between tissue particles.By chemical bond on carbon black particle surface grafting macromolecular chain, and be formed on its surface package Macromolecule layer.The maleic anhydride being grafted up by this method can be firmly bonded to carbon blacksurface, while be grafted on charcoal The amount of the maleic anhydride on black surface is more much larger than the high molecular amount in conjunction with carbon blacksurface, extensible to provide in water enough Repulsion can also make make mutual between carbon black and rubber to improve dispersion stabilization of the carbon black in rubber matrix Effect is enhanced.
In a kind of above-mentioned sealing ring, the mass ratio of the nitrile rubber and gutta percha is (4-5): 1.Gutta percha is A kind of natural high molecular polymer, main component be trans- one polyisoprene of an Isosorbide-5-Nitrae, with natural rubber (NR, cis- 1, 4 one polyisoprene) chemical composition is identical, and isomer, trans- molecular configuration have gutta percha strand each other Three big features: (1) strand is flexible chain, and flexible molecule chain is to constitute the basis of spring chain;(2) contain double bond, can carry out Vulcanization;(3) trans- chain structure orderly easily piles up crystallization.The present invention is used as main body base using nitrile rubber and gutta percha compounding Material, on the one hand, compared with single addition nitrile rubber, sealing ring obtained has superior dynamic tensile fatigue behaviour; On the other hand, currently used carbon black is mostly small molecule, has plasticization to rubber matrix, influences vulcanization to a certain extent The physical property of glue, and gutta percha is the macromolecule polyalcohol containing polar group, can be used as rubber matrix and carbon black circle Face modifying agent can not only improve the dispersibility of carbon black, and contain polarity epoxy group and nonpolar Du in gutta percha Secondary rubber molecule segment, the former can generate strong interaction with carbon black, and the latter has certain compatibility with non-polar rubber again, therefore Gutta percha may be used as the interface modifier of white carbon black Yu non-polar rubber system.
In a kind of above-mentioned sealing ring, the mass ratio of the carbon black and nbr carboxyl terminal is (2-3): 1.The present invention exists Nbr carboxyl terminal is added on the basis of carbon black, it is anti-that with the hydrogen bond in carbon black redox can occur for the carboxyl at both ends It answers, the copolymer segment with cross-linked structure is generated, to increase reinforcing effect of the carbon black in sealing ring;Moreover, 2. with The progress of reaction, nbr carboxyl terminal, which can also be separated out, forms two phase structure with carbon black, and nbr carboxyl terminal is continuous Phase, carbon black are dispersed phase, and carbon black is present in nbr carboxyl terminal with the structure of differential dephasing, i.e. " island structure ", in sea In island structure, these carbon black particles can disperse, absorb external shock stress, prevent the extension of crackle in sealing ring matrix, subtract The fracture of slow material, realizes the Strengthening and Toughening of whole system.Therefore, in the present invention, to carbon black and nbr carboxyl terminal Mass ratio is defined.
In addition, zinc oxide is the vulcanizing agent of the traditional vulcanizing activator of rubber and certain specific rubbers, China rubber at present Glue industry zinc oxide annual consumption is estimated in 200,000 t or more.Common zinc oxide heavy metal zinc content is about 80%, and organic zinc zinc Content can be reduced to 40% or lower.Compared with zinc oxide, organic zinc that the present invention selects has that good dispersion, density be small, sulphur Change fireballing feature, and price is lower.Present invention organic zinc substitute common zinc oxide not only can with the feature of environmental protection of sealing ring, Heavy metal zinc resource is saved, the wear-resisting property and ageing-resistant performance of sealing ring can also be significantly improved.
Preferably, the modified carbon nano-tube is to be modified with dopamine cladding process.Coating modification carbon is received Mitron has good dispersibility, promotes its reinforcing effect, improves the tensile strength and elongation rate of tensile failure of sealing ring composite material, Improve its thermal stability.
Preferably, the age resister includes light stabilizer, heat stabilizer, anti ultraviolet agent, one in antioxidant Kind is a variety of.
Preferably, the vulcanizing agent is sulphur, N, one of N '-penylene bismaleimide, peroxide Or it is a variety of.Before sealing ring is uncured, lack good physical mechanical property, practical value is little.When through addition vulcanizing agent, After vulcanization aid is vulcanized, due to the variation of molecular structure, and make its comprehensive significant modification, especially tensile strength, fixed Stress, elongation, elasticity, wearability, hardness etc. is stretched to become apparent.And the vulcanizing agent being added also helps the solution of carbon nanotube It twines.
Further preferably, sulphur and N in the vulcanizing agent, the mass ratio 1.5- of N '-penylene bismaleimide 2.5:1.Through testing, when vulcanizing agent selects sulphur and N, N '-penylene bismaleimide 1.5-2.5:1 in mass ratio to compound When, vulcanization effect is more preferable, which is because, N, N '-penylene bismaleimide conduct auxiliary vulcanizing agent, significantly improve association Performance improves heat resistance, significantly reduces compression set, moreover it is possible to reduce the dosage of peroxide.
The present invention also provides a kind of processing method of above-mentioned sealing ring, the processing method includes claiming by mentioned component Take raw material, blanking, one section of mixing, two-stage mixing, molding;
Blanking sequence is followed successively by nitrile rubber, isotactic polypropylene, carbon black, polyether plasticizer, modified carbon nano-tube, idol Join agent, organic zinc, age resister, vulcanizing agent;
One section of mixing carries out in mixer, rotor speed 40-45r.min-1, 35-38 DEG C of cooling water, pressure pressure 0.8- 1.2MPa, fill factor 0.75, slice parks 5-8h after dumping.Blanking control of the present invention m- power curve joint control when using Preparation method, i.e. subsection charging use time control act.Last discharge uses power curve control methods, i.e., power rise arrives after oiling Maximum value, then decline simultaneously steadily carries out discharge after a certain period of time.
Two-stage mixing carries out in open mill, and roller temperature is 55-70 DEG C, mixing time 360-500s.
Described one section is also added into the high glue powder that quality is sealing ring quality 2.5-3.7% when being kneaded.It is prepared by the present invention It is also added into high glue powder in the process, the introducing of high glue powder improves the storage modulus, loss modulus and viscosity of composite material, one Determine the nucleation that abscess is inhibited in degree;Compared with being added without high glue powder, the impact that the addition of high glue powder improves sealing ring is strong Degree, when high glue powder content be 2.5-3.7% when, foam structure be improved significantly, cell diameter becomes smaller, and cell density becomes larger. Also, the present invention is added in one section of mixing, can further increase the compatibility of high glue powder Yu sealing ring raw material, guarantee that its is right In the humidification of sealing ring.
Described is shaped to be injection moulded, and injection pressure is 1.52-1.82 × 10 in injection moulding3KN, sulfide stress are 1.92-2.05×103KN, vulcanization time 80-120s.It is handled using injection moulding vulcanization, sizing material has obtained before injecting mold To being fully warmed-up and preplasticizing, good fluidity, be conducive to stabilize and increase product quality;Especially improve the densification of sealing ring Property, precision size degree.
The molding can be compression molding, and upper mold temperature is 180-185 DEG C in compression molding, and lower die temperature is 175- 180 DEG C, molding time 120-180s.
The processing method further includes post-cure processing after compression molding, and the temperature of post-cure processing is 130- 140 DEG C, vulcanization time 90-120min.
Compared with prior art, the invention has the following advantages that
1, sealing ring of the invention compounds on nitrile matrix is added to gutta percha, isotactic polypropylene, changes Property carbon nanotube, the carbon black of compounding, modification white carbon black make reinforcing agent, and be further added with machine zinc, coupling agent, compounding it is anti- Aging agent, vulcanizing agent further increase the tear-resistant, wear-resisting of the comprehensive performance of sealing ring, especially sealing ring, low compression set Deformation.
2, the processing technology of sealing ring of the present invention is simple and easy, is kneaded the performance for further increasing sealing ring by being segmented, Forming method after especially two sections mixings can be selected to be molded to use and be injection moulded.Temperature appropriate and two in compression molding Secondary vulcanizing treatment further increases the intensity of sealing ring, wearability.The good fluidity of sizing material in injection moulding, is conducive to improve close The compactness of seal, and then improve wearability, the crush resistance of sealing ring.
Specific implementation method
In order to which the technical problems, technical solutions and beneficial effects solved by the present invention is more clearly understood, in conjunction with implementation Example, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used to explain this hair It is bright, it is not intended to limit the present invention.
Table 1: the ingredient and its parts by weight of sealing ring in embodiment
Embodiment 1
Blanking: raw material is weighed by raw material described in 1 embodiment 1 of table, successively blanking in the following order: nitrile rubber, complete With vertical structure polypropylene, carbon black, polyether plasticizer, modified carbon nano-tube, coupling agent, organic zinc, age resister, vulcanizing agent.
One section of mixing: one section of mixing carries out in mixer, rotor speed 42r.min-1, 36 DEG C of cooling water, pressure pressure 1.0MPa, fill factor 0.75, slice parks 6h after dumping, and it is sealing ring quality that when one section of mixing, which is also added into quality, 2.5% high glue powder.
Two-stage mixing: two-stage mixing carries out in open mill, and roller temperature is 65 DEG C, mixing time 300s.
Molding: obtaining sealing ring of the present invention by injection moulding vulcanization, and injection pressure is 1.65 × 10 in injection moulding3KN, Sulfide stress is 1.98 × 103KN, vulcanization time 80s.
Embodiment 2
Difference with embodiment 1 is only that, is shaped in the present embodiment by being pressed and molded, upper mold temperature in compression molding It is 180 DEG C, lower die temperature is 175 DEG C, molding time 150s;Post-cure processing, post-cure processing are carried out after compression molding Temperature be 140 DEG C, vulcanization time 100min.
Embodiment 3
Blanking: raw material is weighed by raw material described in 1 embodiment 3 of table, successively blanking in the following order: sound of chopping wood nitrile rubber, Isotactic polypropylene, carbon black, polyether plasticizer, modified carbon nano-tube, coupling agent, organic zinc, age resister, vulcanizing agent.
One section of mixing: one section of mixing carries out in mixer, rotor speed 43r.min-1, 37 DEG C of cooling water, pressure pressure 0.9MPa, fill factor 0.75, slice parks 7h after dumping, and it is sealing ring quality that when one section of mixing, which is also added into quality, 2.8% high glue powder.
Two-stage mixing: two-stage mixing carries out in open mill, and roller temperature is 68 DEG C, mixing time 360s.
Molding: obtaining sealing ring of the present invention by injection moulding vulcanization, and injection pressure is 1.7 × 10 in injection moulding3KN, sulphur Changing pressure is 2.02 × 103KN, vulcanization time 70s.
Embodiment 4
Difference with embodiment 3 is only that, is shaped in the present embodiment by being pressed and molded, upper mold temperature in compression molding It is 185 DEG C, lower die temperature is 180 DEG C, molding time 160s;Post-cure processing, post-cure processing are carried out after compression molding Temperature be 140 DEG C, vulcanization time 100min.
Embodiment 5
Blanking: raw material is weighed by raw material described in 1 embodiment 5 of table, successively blanking in the following order: nitrile rubber, complete With vertical structure polypropylene, carbon black, polyether plasticizer, modified carbon nano-tube, coupling agent, organic zinc, age resister, vulcanizing agent.
One section of mixing: one section of mixing carries out in mixer, rotor speed 44r.min-1, 36 DEG C of cooling water, pressure pressure 1.1MPa, fill factor 0.75, slice parks 6h after dumping, and it is sealing ring quality that when one section of mixing, which is also added into quality, 3.0% high glue powder.
Two-stage mixing: two-stage mixing carries out in open mill, and roller temperature is 60 DEG C, mixing time 300s.
Molding: obtaining sealing ring of the present invention by injection moulding vulcanization, and injection pressure is 1.58 × 10 in injection moulding3KN, Sulfide stress is 1.96 × 103KN, vulcanization time 95s.
Embodiment 6
Difference with embodiment 5 is only that, is shaped in the present embodiment by being pressed and molded, upper mold temperature in compression molding It is 183 DEG C, lower die temperature is 178 DEG C, molding time 170s;Post-cure processing, post-cure processing are carried out after compression molding Temperature be 140 DEG C, vulcanization time 100min.
Embodiment 7
Blanking: raw material is weighed by raw material described in 1 embodiment 7 of table, successively blanking in the following order: nitrile rubber, complete With vertical structure polypropylene, carbon black, polyether plasticizer, modified carbon nano-tube, coupling agent, organic zinc, age resister, vulcanizing agent.
One section of mixing: one section of mixing carries out in mixer, rotor speed 41r.min-1, 37 DEG C of cooling water, pressure pressure 1.0MPa, fill factor 0.75, slice parks 7h after dumping, and it is sealing ring quality that when one section of mixing, which is also added into quality, 3.2% high glue powder.
Two-stage mixing: two-stage mixing carries out in open mill, and roller temperature is 58 DEG C, mixing time 360s.
Molding: obtaining sealing ring of the present invention by injection moulding vulcanization, and injection pressure is 1.78 × 10 in injection moulding3KN, Sulfide stress is 2.02 × 103KN, vulcanization time 65s.
Embodiment 8
Difference with embodiment 7 is only that, is shaped in the present embodiment by being pressed and molded, upper mold temperature in compression molding It is 185 DEG C, lower die temperature is 180 DEG C, molding time 120s;Post-cure processing, post-cure processing are carried out after compression molding Temperature be 140 DEG C, vulcanization time 100min.
Embodiment 9
Blanking: raw material is weighed by raw material described in 1 embodiment 9 of table, successively blanking in the following order: nitrile rubber, complete With vertical structure polypropylene, carbon black, polyether plasticizer, modified carbon nano-tube, coupling agent, organic zinc, age resister, vulcanizing agent.
One section of mixing: one section of mixing carries out in mixer, rotor speed 40r.min-1, 38 DEG C of cooling water, pressure pressure 0.8MPa, fill factor 0.75, slice parks 8h after dumping, and it is sealing ring quality that when one section of mixing, which is also added into quality, 3.5% high glue powder.
Two-stage mixing: two-stage mixing carries out in open mill, and roller temperature is 55 DEG C, mixing time 360s.
Molding: obtaining sealing ring of the present invention by injection moulding vulcanization, and injection pressure is 1.52 × 10 in injection moulding3KN, Sulfide stress is 1.92 × 103KN, vulcanization time 100s.
Embodiment 10
Difference with embodiment 9 is only that, is shaped in the present embodiment by being pressed and molded, upper mold temperature in compression molding It is 185 DEG C, lower die temperature is 180 DEG C, molding time 120s;Post-cure processing, post-cure processing are carried out after compression molding Temperature be 140 DEG C, vulcanization time 100min.
Embodiment 11
Blanking: raw material is weighed by raw material described in 1 embodiment 11 of table, successively blanking in the following order: nitrile rubber, complete With vertical structure polypropylene, carbon black, polyether plasticizer, modified carbon nano-tube, coupling agent, organic zinc, age resister, vulcanizing agent.
One section of mixing: one section of mixing carries out in mixer, rotor speed 45r.min-1, 35 DEG C of cooling water, pressure pressure 1.2MPa, fill factor 0.75, slice parks 5h after dumping, and it is sealing ring quality that when one section of mixing, which is also added into quality, 3.7% high glue powder.
Two-stage mixing: two-stage mixing carries out in open mill, and roller temperature is 70 DEG C, mixing time 360s.
Molding: obtaining sealing ring of the present invention by injection moulding vulcanization, and injection pressure is 1.82 × 10 in injection moulding3KN, Sulfide stress is 2.05 × 103KN, vulcanization time 60s.
Embodiment 12
Difference with embodiment 11 is only that, is shaped in the present embodiment by being pressed and molded, upper mold temperature in compression molding Degree is 183 DEG C, and lower die temperature is 178 DEG C, molding time 180s;Post-cure processing is carried out after compression molding, at post-cure The temperature of reason is 140 DEG C, vulcanization time 100min.
Embodiment 13
Difference with embodiment 1 is only that the mass ratio of nitrile rubber and gutta percha is 3.8:1 in the embodiment.
Embodiment 14
Difference with embodiment 13 is only that, is shaped in the present embodiment by being pressed and molded, upper mold temperature in compression molding Degree is 180 DEG C, and lower die temperature is 175 DEG C, molding time 180s;Post-cure processing is carried out after compression molding, at post-cure The temperature of reason is 140 DEG C, vulcanization time 100min.
Embodiment 15
Difference with embodiment 1 is only that the mass ratio of nitrile rubber and gutta percha is 5.2:1 in the embodiment.
Embodiment 16
Difference with embodiment 15 is only that, is shaped in the present embodiment by being pressed and molded, upper mold temperature in compression molding Degree is 180 DEG C, and lower die temperature is 175 DEG C, molding time 180s;Post-cure processing is carried out after compression molding, at post-cure The temperature of reason is 140 DEG C, vulcanization time 100min.
Embodiment 17
Difference with embodiment 1 is only that the mass ratio of carbon black and nbr carboxyl terminal is 1.8:1 in the embodiment.
Embodiment 18
Difference with embodiment 13 is only that, is shaped in the present embodiment by being pressed and molded, upper mold temperature in compression molding Degree is 180 DEG C, and lower die temperature is 175 DEG C, molding time 180s;Post-cure processing is carried out after compression molding, at post-cure The temperature of reason is 140 DEG C, vulcanization time 100min.
Embodiment 19
Difference with embodiment 1 is only that the mass ratio of carbon black and nbr carboxyl terminal is 3.2:1 in the embodiment.
Embodiment 20
Difference with embodiment 15 is only that, is shaped in the present embodiment by being pressed and molded, upper mold temperature in compression molding Degree is 180 DEG C, and lower die temperature is 175 DEG C, molding time 180s;Post-cure processing is carried out after compression molding, at post-cure The temperature of reason is 140 DEG C, vulcanization time 100min.
Embodiment 21
Difference with embodiment 1 is only that, that high glue powder is not added in the embodiment.
Embodiment 22
Difference with embodiment 21 is only that, is shaped in the present embodiment by being pressed and molded, upper mold temperature in compression molding Degree is 180 DEG C, and lower die temperature is 175 DEG C, molding time 180s;Post-cure processing is carried out after compression molding, at post-cure The temperature of reason is 140 DEG C, vulcanization time 100min.
Comparative example 1
For common commercially available sealing ring in the prior art.
Comparative example 2
Difference with embodiment 1 is only that, is not added with gutta percha in the comparative example.
Comparative example 3
Difference with embodiment 1 is only that, is not added with isotactic polypropylene in the comparative example.
Comparative example 4
Difference with embodiment 1 is only that, is not added with nbr carboxyl terminal in the comparative example
Comparative example 5
Difference with embodiment 1 is only that, is not added with modified carbon nano-tube in the comparative example.
Comparative example 6
Difference with embodiment 1 is only that, is not added with carbon black in the comparative example.
Sealing ring in embodiment 1-20 and comparative example 1-6 is tested for the property, test result is as shown in table 2.
Table 2: the performance test of embodiment 1-20 and the sealing ring in comparative example 1-6
In conclusion passing through comparative example 1-22 and comparative example 1-6 it is found that sealing ring compatibility of the present invention is reasonable, process Simple for process, the sealing ring processed has preferable intensity, wearability, crush resistance.Sealing ring of the invention exists Compounding is added to gutta percha, isotactic polypropylene, modified carbon nano-tube, the carbon black of compounding, modification on nitrile matrix White carbon black make reinforcing agent, and be further added with machine zinc, coupling agent, the age resister of compounding, vulcanizing agent further increase it is close The tear-resistant, wear-resisting of the comprehensive performance of seal, especially sealing ring, low compression set.
Specific embodiment described in the present invention only illustrate the spirit of the present invention by way of example.The neck of technology belonging to the present invention The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
It is skilled to this field although present invention has been described in detail and some specific embodiments have been cited For technical staff, as long as it is obvious for can making various changes or correct without departing from the spirit and scope of the present invention.

Claims (10)

1. a kind of sealing ring, which is characterized in that the sealing ring includes the ingredient of following parts by weight:
Nitrile rubber: 100 parts
Gutta percha: 15-25 parts
Isotactic polypropylene: 15-25 parts
Carbon black: 40-80 parts
Nbr carboxyl terminal: 5-15 parts
Modified carbon nano-tube: 2-5 parts
Coupling agent: 1-3 parts
Organic zinc: 2-8 parts
Age resister: 6-10 parts
Vulcanizing agent: 3-8 parts.
2. sealing ring according to claim 1, which is characterized in that the content of acrylonitrile is 45- in the nitrile rubber 55%.
3. sealing ring according to claim 1, which is characterized in that the carbon black is carbon black N990, carbon black N550, modification The mixture of white carbon black, the carbon black N990, carbon black N550, modified white carbon black mass ratio be 1-2:2-3:1.
4. sealing ring according to claim 1, which is characterized in that the mass ratio of the nitrile rubber and gutta percha is (4-5): 1.
5. sealing ring according to claim 1, which is characterized in that the mass ratio of the carbon black and nbr carboxyl terminal is (2-3):1。
6. a kind of processing method of sealing ring, which is characterized in that the processing method includes claiming by ingredient described in claim 1 Raw material, blanking, one section of mixing, two-stage mixing, molding are taken, blanking sequence is followed successively by nitrile rubber, isotactic polypropylene, charcoal Black, polyether plasticizer, modified carbon nano-tube, coupling agent, organic zinc, age resister, vulcanizing agent;One section be kneaded in mixer into Row, rotor speed 40-45r.min-1, 35-38 DEG C of cooling water, pressure pressure 0.8-1.2MPa, fill factor 0.75 goes out after dumping Piece parks 5-8h;Two-stage mixing carries out in open mill, and roller temperature is 55-70 DEG C, mixing time 360-500s.
7. the processing method of sealing ring according to claim 6, which is characterized in that be also added into matter when one section of mixing Amount is the high glue powder of sealing ring quality 2.5-3.7%.
8. the processing method of sealing ring according to claim 6, which is characterized in that described is shaped to be injection moulded, note Penetrating injection pressure in molding is 1.52-1.82 × 103KN, sulfide stress are 1.92-2.05 × 103KN, vulcanization time 80- 120s。
9. the processing method of sealing ring according to claim 6, which is characterized in that the molding can be to be molded into Type, upper mold temperature is 180-185 DEG C in compression molding, and lower die temperature is 175-180 DEG C, molding time 120-180s.
10. the processing method of sealing ring according to claim 6, which is characterized in that after compression molding further include secondary Vulcanizing treatment, the temperature of post-cure processing are 130-140 DEG C, vulcanization time 90-120min.
CN201811391492.6A 2018-11-21 2018-11-21 A kind of sealing ring Pending CN109627516A (en)

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Publication number Priority date Publication date Assignee Title
CN110982128A (en) * 2019-12-19 2020-04-10 河南省金启橡塑有限公司 High-pressure-resistant self-lubricating sealing ring and preparation method thereof
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CN112608535A (en) * 2020-11-28 2021-04-06 无锡禾杰机械有限公司 Rubber door panel part and preparation method thereof
CN113881117A (en) * 2021-11-01 2022-01-04 昆山恒圣亚五金塑料制品有限公司 High-temperature-resistant and oxidation-resistant rubber ring

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