A kind of EPDM sealing elementTechnical field
The invention belongs to sealing element technical fields, and in particular to a kind of EPDM sealing element.
Background technique
Rubber seal is a kind of general basic element in sealing device, is played the part of in leaking and sealing this conflictHighly important role is widely applied one kind rubber product in sealing technique.Rubber seal have well elasticity, compared withWide temperature range, biggish deformation will be generated by giving lesser stress in different media, and this deformation can be provided and be connectTouch pressure compensates leakage-gap, achievees the purpose that sealing.There are many rubber types for rubber seal, and wherein EPDM glue occupiesLarger proportion has the characteristics that good ozone resistance, electrical insulation capability.
Application number CN2014103260778 Chinese patent application discloses " a kind of EPDM sealing strips for windshield ", includingFollowing raw material: 80-120 parts of ethylene propylene diene rubber, 3-7 parts of zinc oxide, 0.5-1.5 parts of stearic acid, 1-2 parts of paraffin,N660120-200 parts, 100-140 parts of naphthenic oil, Z1-3 parts of accelerant B, 1-1.6 parts of altax, Vulcanization accelerator TMTD 0.4-0.8Part, 1-2 parts of sulphur.The invention is formulated simple and practical advantage, but since the high temperature that outdoor sunlight is exposed to the sun conducts and hot spokeIt penetrates, is chronically under outdoor ambient temperature and works, sealing element stress relaxation, resilience cannot persistently be kept, and be thus difficult to fullFoot needs the use that these performance requirement high fields are closed.
The Chinese patent application of application number CN2016103482321 discloses a kind of super high- and low-temperature resistance sealing element ternaryThird material of second and preparation method thereof, composition and weight fraction are as follows: EPDM578f, EPDM834A30, EPDM4045 30, HAY haveMachine zinc 1-5, carbon black N33010-50, paraffin oil 5-20, vulcanizing agent 1-10, assistant crosslinking agent 1-8, peroxide 1-5.The invention is adoptedImproved with different compounding techniques and special auxiliary agent and optimize its characteristic, it is made to keep sealing effect, but the equal source of primary raw materialIn overseas-funded enterprise, the cost of raw material is higher.
The Chinese patent application of application number CN2015101406765 discloses a kind of EPDM sealing element, has studied EPDMThe antibacterial and mouldproof performance of sealing element does not make a search to stability, the heat resistance of sealing property of sealing component.
Summary of the invention
For the deficiency of existing issue, the object of the present invention is to provide a kind of EPDM sealing elements, can keep for a long time excellentDifferent sealing performance, temperature tolerance and corrosion resistance and good, and it is low in cost, preparation method is simple.
The technical solution used to solve the technical problems of the present invention is that:
A kind of EPDM sealing element, main component and corresponding parts by weight are as follows: 80-90 parts of EPDM, 20-30 parts of SBS, SEBS10-20 parts, it is 10-20 parts of PHB, 3-5 parts of anti-aging agent, 2-5 parts of nano zircite, tantalum 1-3 parts nano oxidized, 2-5 parts of vulcanizing agent,3-6 parts of niobium carbide powder, the average grain diameter of the niobium carbide is 200-400 mesh, wherein the EPDM sealing element is thick by surfaceRough processing forms.
As the optimal technical scheme of the application, the niobium carbide powder the preparation method comprises the following steps:
(1) ratio of 10:0.5-2 weighs niobium pentaoxide and epoxy resin, after mixing, 80-120 DEG C in mass ratioSolidification obtains raw material 1 after crushing；
(2) raw material 1 and epoxy resin will be weighed according to mass ratio 10:1-3, after mixing, 80-100 DEG C of solidification crushesRaw material 2 is obtained afterwards；
(3) by the pressurization briquetting of raw material 2, niobium carbide block is made in the 6-8h that then burns paper as sacrificial offerings under 1200-1700 DEG C of argon atmosphere；
(4) 10h decarburization is kept the temperature under 300-500 DEG C of oxidizing atmosphere, prepares niobium carbide powder after cooling.
As the optimal technical scheme of the application, the method for the rough surface processing includes the following steps: EPDM is closeSealing is existing to impregnate 5-10min in concentrated sulfuric acid, then impregnates 5-10min with the ammonium hydroxide of 5-10%, then successively clear with acetone, waterIt is clean to wash surface.
As the optimal technical scheme of the application, the anti-aging agent is antioxidant MB or anti-aging agent RD.
As the optimal technical scheme of the application, the vulcanizing agent is cumyl peroxide.
EPDM sealing element provided by the invention has the advantages that compared with prior art
(1) adding SBS and SEBS improves the elasticity of EPDM sealing element, to improve its sealing performance, addition PHB improves closeThe thermal insulation property of sealing, and by adjusting the cooperation of appropriate proportioning and auxiliary agent, it improves it and uses the time；
(2) nano zircite and nano oxidized tantalum are added, in mixing process, nano zircite and nano oxidized tantalum are uniformIt is distributed between rubber components, and in sulfidation, even into rubber network inside, improves the intensity of sealing element；
(3) niobium carbide powder is added, first is that the intensity of sealing element is improved, second is that EPDM sealing element can be improved in niobium carbideCapability of resistance to radiation, and radiation is a major reason of EPDM sealing element aging；
(4) it is handled by rough surface, guarantees when in use wear surface protrusion particle first, and then improve EPDM sealingThe wear-resisting property of part in use；
(5) excellent sealing performance, temperature tolerance and corrosion resistance and good, and low in cost, preparation method can be kept for a long timeSimply.
Specific embodiment
The present invention is described in further details with reference to embodiments.Production is not specified in agents useful for same or instrument and equipmentManufacturer, it is accordingly to be regarded as the conventional products that can be bought by market.
Embodiment 1:
A kind of EPDM sealing element, main component and corresponding parts by weight are as follows: 80 parts of EPDM, SBS20 parts, SEBS10 parts,PHB10 parts, 3 parts of antioxidant MB, 2 parts of nano zircite, 1 part of nano oxidized tantalum, 2 parts of vulcanizing agent cumyl peroxide, carbonization3 parts of niobium powder body, the average grain diameter of the niobium carbide is 200 mesh, wherein the EPDM sealing element passes through rough surface processingIt forms.
Niobium carbide powder described above the preparation method comprises the following steps:
(1) ratio of 10:0.5 weighs niobium pentaoxide and epoxy resin in mass ratio, after mixing, 80 DEG C of solidifications,Raw material 1 is obtained after crushing；
(2) raw material 1 and epoxy resin will be weighed according to mass ratio 10:1, after mixing, 80 DEG C of solidifications obtain former after crushingMaterial 2；
(3) by the pressurization briquetting of raw material 2, niobium carbide block is made in the 6h that then burns paper as sacrificial offerings under 1200 DEG C of argon atmosphere；
10h decarburization is kept the temperature under (4) 300 DEG C of oxidizing atmospheres, prepares niobium carbide powder after cooling.
The method of above-mentioned rough surface processing includes the following steps: to show EPDM sealing element impregnates 5min in concentrated sulfuric acid,Then 5min is impregnated with 5% ammonium hydroxide, it is then successively clean with acetone, water clean the surface.
Embodiment 2:
A kind of EPDM sealing element, main component and corresponding parts by weight are as follows: 85 parts of EPDM, 25 parts of SBS, 15 parts of SEBS,15 parts of PHB, 4 parts of anti-aging agent RD, 2 parts of nano zircite, 2 parts of nano oxidized tantalum, 4 parts of vulcanizing agent cumyl peroxide, carbonChange 5 parts of niobium powder body, the average grain diameter of the niobium carbide is 300 mesh, wherein the EPDM sealing element is handled by rough surface to be addedWork forms.
It is above-mentioned state niobium carbide powder the preparation method comprises the following steps:
(1) ratio of 10:1 weighs niobium pentaoxide and epoxy resin in mass ratio, after mixing, 100 DEG C of solidifications, powderRaw material 1 is obtained after broken；
(2) raw material 1 and epoxy resin will be weighed according to mass ratio 10:1-3, after mixing, 100 DEG C of solidifications, after crushingObtain raw material 2；
(3) by the pressurization briquetting of raw material 2, niobium carbide block is made in the 7h that then burns paper as sacrificial offerings under 1500 DEG C of argon atmosphere；
10h decarburization is kept the temperature under (4) 400 DEG C of oxidizing atmospheres, prepares niobium carbide powder after cooling.
The method of above-mentioned rough surface processing includes the following steps: to show EPDM sealing element impregnates 8min in concentrated sulfuric acid,Then 7min is impregnated with 8% ammonium hydroxide, it is then successively clean with acetone, water clean the surface.
Embodiment 3:
A kind of EPDM sealing element, main component and corresponding parts by weight are as follows: 90 parts of EPDM, 30 parts of SBS, 20 parts of SEBS,20 parts of PHB, 2 parts of antioxidant MB, 3 parts of anti-aging agent RD, 5 parts of nano zircite, 3 parts of nano oxidized tantalum, vulcanizing agent peroxidating two5 parts of isopropylbenzene, 6 parts of niobium carbide powder, the average grain diameter of the niobium carbide is 400 mesh, wherein the EPDM sealing element passes through tableThe coarse processing in face forms.
Above-mentioned niobium carbide powder the preparation method comprises the following steps:
(1) ratio of 10:2 weighs niobium pentaoxide and epoxy resin in mass ratio, after mixing, 120 DEG C of solidifications, powderRaw material 1 is obtained after broken；
(2) raw material 1 and epoxy resin will be weighed according to mass ratio 10:3, after mixing, 100 DEG C of solidifications, after crushingRaw material 2；
(3) by the pressurization briquetting of raw material 2, niobium carbide block is made in the 8h that then burns paper as sacrificial offerings under 1700 DEG C of argon atmosphere；
10h decarburization is kept the temperature under (4) 500 DEG C of oxidizing atmospheres, prepares niobium carbide powder after cooling.
The method of above-mentioned rough surface processing includes the following steps: to show EPDM sealing element impregnates 10min in concentrated sulfuric acid,Then 10min is impregnated with 10% ammonium hydroxide, it is then successively clean with acetone, water clean the surface.
Comparative example 1
For other operating procedures of comparative example 1 with embodiment 2, difference is only that EPDM sealing element is handled without rough surface.
Comparative example 2
For other operating procedures of comparative example 2 with embodiment 2, difference is only that EPDM sealing element does not add niobium carbide powder.
Following table is that Examples 1 to 3 and 1~2 wear-resisting property of comparative example and aging speed compare
It, can be long-term by experiment it can be found that EPDM sealing element of the invention is significantly lower than control group in aging speedExcellent sealing performance is maintained, does not have slight crack in -60 DEG C of tests of low temperature, in 170 DEG C of 168h, aging period compressive deformation is lower than5%, while wear-resisting property is also greatly improved.
Protection content of the invention is not limited to above embodiments.Without departing from the spirit and scope of the invention, originallyField technical staff it is conceivable that variation and advantage be all included in the present invention, and with the attached claims be protectionRange.