CN1733831A - Valve bush rubber and its preparation method - Google Patents
Valve bush rubber and its preparation method Download PDFInfo
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- CN1733831A CN1733831A CN 200410020251 CN200410020251A CN1733831A CN 1733831 A CN1733831 A CN 1733831A CN 200410020251 CN200410020251 CN 200410020251 CN 200410020251 A CN200410020251 A CN 200410020251A CN 1733831 A CN1733831 A CN 1733831A
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Abstract
The rubber for valve bushing with well anti-abrasive, chemical-resisting, thermostable and waterproof property comprises constituents as: 60/40 EPT, activated zinc oxide, organic activated agent stearic acid 0, quinoline polymer, HAF, and sulfur. After milling, inject the material with rubber syringe on piston pressure (2.5-3.0)kg/cm2 and temperature of 40-50Deg into directly on the surface of the objective valve part in mould; vulcanizing and covering the rubber layer. The product can be used on pipes for steam and acid/alkali medium more than one year.
Description
Technical field:
The present invention relates to a kind of rubber and preparation method thereof.Particularly a kind of rubber that is used for valve bushing and preparation method thereof.
Background technology:
At oil, chemical industry, pharmacy, generating is in metallurgy and the industries such as food and building, for fluming water, steam, acid, the valve in the piping facility of media such as alkali and organic solution is because the medium of its contact has high temperature, high pressure and chemical corrosivity, general lining rubber bushing on the parts of valve cavity, and rubber bushing completely cuts off the metal parts of medium and valve cavity, in order to avoid damage and corrosion.The metal parts of this rubber bushing and valve cavity is combined into one, and has guaranteed that the high-seal performance of valve also can prolong the work-ing life of valve.
The valve that has rubber bushing occurs at the twentieth century end.But, this valve that has rubber bushing, when the medium temperature of passing through was about 100 ℃ or has chemical corrosivity, the sealing property of valve reduced soon so that can not use, and work-ing life is shorter.Its reason is: the rubber performance of valve lining is low poor, and its abrasion resistance properties is poor, and resistance to elevated temperatures is poor, and water resistance is poor, and resistance to chemical corrosion is poor.Under the general situation, tensile strength is 10-12Mpa; Tensile yield＜250%); Elasticity, wear resistance are undesirable; Heat aging property and acid-proof alkaline are relatively poor; The compression deformation performance is relatively poor, under 100 ℃ * 22 hours condition, and compression deformation rate＞40%.
Because the above performance of valve bushing rubber is lower, when valve opens and closes in high temperature, water or acid-alkali medium repeatedly, wearing and tearing between each parts of the valve etch of medium in addition, make the rubber of valve part lining wear and tear, aging, need to change so that lose sealing property, cause the work-ing life of such valve shorter; Generally speaking, carry acid at present, alkali, organic solution, the valve of the lining rubber of high temperature media such as water or steam, work-ing life is about 3-5 month.
Summary of the invention:
The present invention aims to provide a kind of rubber that is used for valve bushing and preparation method thereof.It wear-resistant, resistance to chemical attack, high temperature resistant, the water-fast performance of soaking is higher.The tensile strength of cross-linked rubber improves 20%, and wear resisting property improves 30%, compression set under 120 ℃ * 22 hours condition＜10%.Carrying acid, alkali, organic solution, in the pipeline of high temperature media such as water or steam, can reach about 1 year work-ing life.
The weight ratio of each component of the present invention is as follows:
60/40 terpolymer EP rubber 50.00-53.00
Active zinc flower 3.00-4.00
Organic active agent stearic acid 0.42-0.60
Quinoline polymkeric substance RD 0.58-0.85
Carbon black HAF 11.50-13.00
Oil base furnace black SRF 17.60-19.00
Silicon-nitrogen compound 5.50-6.80
Dimethyl phthalate 1.90-3.50
Dispersion agent T-78 0.80-1.20
Wetting agent 935P 0.50-0.70
Thiuram 0.10-0.30
Superoxide DCP 2.00-2.50
Sulphur 0.20-0.30
Manufacture craft of the present invention is:
One, batching:
Above each component is standby according to weight ratio weighing successively.
Two, mixing:
1, mixing reinforced order is:
At first 60/40 terpolymer EP rubber is rolled refining, adds following batching then successively:
The first step adds active zinc flower;
Second step added carbon black HAF, oil base furnace black SRF, silicon-nitrogen compound, dimethyl phthalate, dispersion agent T-78;
The 3rd step added organic active agent stearic acid, quinoline polymkeric substance RD, wetting agent 935P;
Add thiuram at last, superoxide DCP, sulphur.
2, mixing processing condition
As adopt mill; The roller temperature is 30-40 ℃, and mixing time is 20 minutes, and roll spacing is 1-5 centimetre:
As to adopt Banbury mixer, roller temperature be 70-80 ℃, and mixing time is 8 minutes.
Three, slice is parked
Sizing material mixing evenly after, put in storage behind the following sheet and park.
Four, injection:
Injection adopts rubber injection machine that the sizing material after mixing is injected mould, places the valve part that needs lining rubber in this mould, and sizing material is injected directly into needs the valve part of lining rubber surface.
During injection, the material feeding tube temperature of rubber injection machine is (40-50) ℃, and annotating plug pressure is (2.5-3.0) kg/cm
2
Five, sulfuration:
Curing temperature is (165-170) ℃, and curing time is (8-15) minute.
Behind over cure, the set surface of valve part can lining rubber.
After testing, the rubber of this valve bushing has following performance:
73 ° of hardness (Shao Er A)
Tensile strength 18-20Mpa,
Tensile yield＞300%
Compression set＜15%
Ozone resistants: examination is stretched to 25%, places 1.5 * 10
-4O
3In the liquid, producing the be full of cracks condition is after 50 ℃ * 200 hours.
Anti-weather: loseed crackle after being exposed to the sun in the sun 2 years.
Resistance to elevated temperatures:
1, in 100 ℃ of water, can reach more than 1 year work-ing life.
2, behind water vapour (198 ℃ * 24 hours), performance variation;
| Hardness (Shao Er A) changes | +5°； |
| Tensile strength changes | -15％； |
| Tensile yield changes | -25％； |
Resistance to chemical corrosion: the changing conditions behind normal temperature * 144 hour;
| Medium | Changes in weight % | Volume change % | The media-resistant coefficient |
| Acetic acid | +6 | +4.5 | 0.85 |
| Sulfuric acid (＜50%) | +6.45 | +3.72 | 0.55 |
| Phosphoric acid (85%) | -0.15 | -0.13 | 1.04 |
| Nitric acid (50%) | +2.55 | +2.12 | 0.75 |
| Hydrochloric acid (＜50%) | +2.3 | +2.17 | 0.81 |
| Sodium hydroxide liquid (saturated) | +0.04 | +0.2 | 1.06 |
| Acetone | +2.24 | +3.2 | - |
| The sulphur phthalic acid dibutyl ester | +1.35 | +1.3 | 0.92 |
| Water (100 ℃ of boiling water) | +2.71 | +2.57 | 0.85 |
| Machine oil | +1.99 | +24.6 | 0.16 |
Show through above-mentioned detected result, valve bushing rubber of the present invention wear-resistant, resistance to chemical attack, high temperature resistant, the water-fast performance of soaking has all had raising.
In component of the present invention, because 60/40 terpolymer EP rubber is saturated carbochain rubber, promptly main chain be-the δ key composition of C-C-, bond energy higher (62.77 kcal/mol); When temperature raises, though molecular motion aggravation, on the major key-the C-C-key remains unchanged, and improves resistance toheat.And in the component of the present invention, adopting superoxide DCP is linking agent, because it decomposites free radical after heating, this free radical can be captured the reactive hydrogen atom on the superpolymer macromole, and constitute the space cancellated-the C-C-chain, bond energy after crosslinked reaches 84 kcal/mol, and the bond distance is 1.54A, i.e. the bond energy height, chain length, therefore, the thermal stability of the rubber behind the sulfidization molding is good, anti-reversion and ageing-resistant performance excellence, compression set is little, i.e. good springiness.
In the component of the present invention, 60/40 terpolymer EP rubber that adopts high iodine absorption value is as matrix, and in component proportioning the thiurams quick acting accelerator, accelerate vulcanization rate, shorten curing time, also help to improve the resistance toheat of moulding rubber.
In the component of the present invention, adopt carbon black HAF as strengthening agent, particle diameter glue is little, is (27-34) millimicron, and iodine absorption value and adsorptive value height are respectively (81-95) mg/g and (85-100) m
2/ g, absorption value is big, is (0.95-1.10) ml/g, the neutral meta-alkalescence of pH value, it easily disperses in rubber, smooth surface, the wear resisting property of the cross-linked rubber after the moulding is good, the intensity height, tension set is little, and heat-resistant aging is good.Weak point is the hardness height, and elongation and tear-resistant performance are relatively poor.
In the component of the present invention, adopt the good springiness of oil base furnace black SRF, particle diameter is big slightly, is the 60-80 millimicron, and iodine absorption value and adsorptive value are on the low side, is respectively (21-30) mg/g and (35-40) m
2/ g, absorption value is moderate, is (0.5-0.7) ml/g, the neutral meta-alkalescence of pH value.It can reach high filler loading capacity in rubber, the dispersing property excellence, and living heat is low, the good springiness of moulding postcure glue, hardness is low, and elongation is big.Weak point is following in the tensile strength, and tensile modulus is little.
Because in the component of the present invention, adopt carbon black HAF and oil base furnace black SRF and suitable proportion thereof as reinforcing filler, the rheological of sizing material is good, smooth surface.The wear resisting property of moulding postcure glue is good, good springiness, and compression set is little, stretch-proof performance and ageing-resistant performance excellence.
All with under the over-all properties prerequisite that does not influence the main body prescription, improve complete processing is that purpose disposes to other auxiliary agent of component of the present invention.Because the viscosity of matrix 60/40 terpolymer EP rubber of component of the present invention is higher, there is additive as carbon black HAP, active zinc flower etc. in each powder to adding with the accumulative form, causes the dispersive resistance in calendering process.Therefore, in component of the present invention, add the dimethyl phthalate that good intermiscibility is arranged with 60/40 terpolymer EP rubber, increased the flexibility and the rheological that has improved sizing material of rubber unvulcanizate; With addition of nontoxic, free of contamination dispersion agent T-78 and wetting agent 935P urge the inside and outside dispersion of sizing material each component lubricated, quicken to disperse, shorten mixing time, and, in moulding process, can eliminate section and surface porosity, the compactness of product is uniform and smooth, and it is stained to suppress gum base ingredients.
In sum, the present invention is a kind of rubber that is used for valve bushing and preparation method thereof.It wear-resistant, resistance to chemical attack, high temperature resistant, the water-fast performance of soaking is higher, the intensity of cross-linked rubber improves 20%, wear resisting property improves 30%, compression set under 120 ℃ * 22 hours condition＜10%.Carrying acid, alkali, organic solution, in the pipeline of high temperature media such as water or steam, can reach about 1 year work-ing life.
Embodiment:
Embodiment 1:
(1) batching; Weighing is standby successively according to the each component of following weight ratio
60/40 terpolymer EP rubber 52.00Kg
Active zinc flower 3.20Kg
Organic active agent stearic acid 0.52Kg
Quinoline polymkeric substance RD 0.62Kg
Carbon black HAF 12.50Kg
Oil base furnace black SRF 18.30Kg
Silicon-nitrogen compound 6.23Kg
Dimethyl phthalate 2.70Kg
Dispersion agent T-78 0.89Kg
Wetting agent 935P 0.63Kg
Thiuram 0.21Kg
Superoxide DCP 2.00Kg
Sulphur 0.20Kg
Add up to 100.00kg
Two, mixing:
It is mixing to use Banbury mixer to carry out, and the roller temperature is 70 ℃, and mixing time is 8 minutes;
At first 60/40 terpolymer EP rubber is rolled refining, add following batching then successively;
1, active zinc flower 2, carbon black HAF, oil base furnace black SRF, silicon-nitrogen compound, dimethyl phthalate, dispersion agent T-78; 3, organic active agent stearic acid, quinoline polymkeric substance RD, wetting agent 935P; 4, thiuram, superoxide DCP, sulphur.
To be mixed evenly after, following sheet cooling back warehouse-in is parked.
Three, injection:
Adopt rubber injection machine that the sizing material after mixing is injected the mould that has valve base cavity, sizing material is injected directly into the surface of valve base cavity.During injection, the material feeding tube temperature of rubber injection machine is 40 ℃, and annotating plug pressure is 2.5kg/cm
2
Four, sulfuration:
Curing temperature is 168 ℃, and curing time is 15 minutes.
Behind over cure, valve base surface can lining rubber.
The rubber bushing of this valve seat after testing, performance is as follows:
Under the normal temperature:
72 ° of hardness (Shao Er A);
Tensile strength 18.1Mpa;
Tensile yield 325%;
Compression set (120 ℃ * 22 hours) 14.5%;
The aging back of warm air (120 ℃ * 24 hours) velocity of variation:
Hardness (Shao Er A)+3 °;
Tensile strength-2.8;
Tensile yield-20.
Embodiment 2
(1) batching; Weighing is standby successively according to the each component of following weight ratio
60/40 terpolymer EP rubber 52.00Kg
Active zinc flower 3.50Kg
Organic active agent stearic acid 0.60Kg
Quinoline polymkeric substance RD 0.83Kg
Carbon black HAP 12.00Kg
Oil base furnace black SRF 18.00Kg
Silicon-nitrogen compound 6.50Kg
Dimethyl phthalate 2.00Kg
Dispersion agent T-78 0.97Kg
Wetting agent 935P 0.70Kg
Thiuram 0.20Kg
Superoxide DCP 2.50Kg
Sulphur 0.20Kg
Amount to 100.00Kg
Two, mixing:
Above component is reinforced according to the reinforced order of embodiment 1; It is mixing to use Banbury mixer to carry out, and the roller temperature is 80 ℃, and mixing time is 8 minutes; To be mixed evenly after, following sheet cooling back warehouse-in is parked.
Three, injection:
Adopt rubber injection machine that the sizing material after mixing is injected the mould that has spool, sizing material is injected directly into spool face.During injection, the material feeding tube temperature of rubber injection machine is 50 ℃, and annotating plug pressure is 2.5kg/cm
2
Four, 168 ℃ of curing temperatures, curing time 15 minutes.
Behind over cure, spool face can lining rubber.
The rubber bushing of this spool after testing, performance is as follows:
Under the normal temperature:
72 ° of hardness (Shao Er A);
Tensile strength 18.6Mpa;
Tensile yield 330%;
Compression set (120 ℃ * 22 hours) 14.5%;
The aging back of warm air (120 ℃ * 24 hours) velocity of variation:
Hardness (Shao Er A)+3 °;
Tensile strength-2.6
Tensile yield-20.5.
Embodiment 3
One, batching; Weighing is standby successively according to the each component of following weight ratio
60/40 terpolymer EP rubber 51.00Kg
Active zinc flower 4.00Kg
Organic active agent stearic acid 0.50Kg
Quinoline polymkeric substance RD 0.65Kg
Carbon black HAP 13.00Kg
Oil base furnace black SRF 18.00Kg
Silicon-nitrogen compound 5.50Kg
Dimethyl phthalate 3.00Kg
Dispersion agent T-78 1.20Kg
Wetting agent 935P 0.70Kg
Thiuram 0.20Kg
Superoxide DCP 2.00Kg
Sulphur 0.25Kg
Add up to 100.00Kg
Two, mixing:
Above component is reinforced according to the reinforced order of embodiment 1; It is mixing to use mill to carry out, and the roller temperature is 40 ℃, and mixing time is 20 minutes; To be mixed evenly after, following sheet cooling back warehouse-in is parked.
Three, injection:
Adopt rubber injection machine that the sizing material after mixing is injected the mould that has valve seat, sizing material is injected directly into valve base surface.During injection, the material feeding tube temperature of rubber injection machine is 50 ℃, and annotating plug pressure is 3.0kg/cm
2
Four, sulfuration:
Curing temperature is 170 ℃, and curing time is 10 minutes.
Behind over cure, valve base surface can lining rubber.
The rubber bushing of this valve seat after testing, performance is as follows:
Under the normal temperature:
74 ° of hardness (Shao Er A);
Tensile strength 19.8Mpa;
Tensile yield 310%;
Compression set (120 ℃ * 22 hours) 13.8%;
The aging back of warm air (120 ℃ * 24 hours) velocity of variation:
Hardness (Shao Er A)+3 °;
Tensile strength-3.4Mpa;
Tensile yield-18.6%.
Among the above embodiment 1,2,3, gained valve bushing rubber all reaches more than 1 year duration of service in acid-alkali medium.
Claims (2)
1, a kind of rubber that is used for valve bushing and preparation method thereof, the weight ratio of rubber each component that it is characterized in that being used for valve bushing is as follows:
The weight ratio of each component of the present invention is as follows:
60/40 terpolymer EP rubber 50.00-53.00
Active zinc flower 3.00-4.00
Organic active agent stearic acid 0.42-0.60
Quinoline polymkeric substance RD 0.58-0.85
Carbon black HAF 11.50-13.00
Oil base furnace black SRF 17.60-19.00
Silicon-nitrogen compound 5.50-6.80
Dimethyl phthalate 1.90-3.50
Dispersion agent T-78 0.80-1.20
Wetting agent 935P 0.50-0.70
Thiuram 0.10-0.30
Superoxide DCP 2.00-2.50
Sulphur 0.20-0.30
2, according to described a kind of rubber that is used for valve bushing of claim 1 and preparation method thereof, the making method that it is characterized in that being used for the rubber of valve bushing is:
One, batching:
Following each component is standby according to weight ratio weighing successively
60/40 terpolymer EP rubber 50.00-53.00
Active zinc flower 3.00-4.00
Organic active agent stearic acid 0.42-0.60
Quinoline polymkeric substance RD 0.58-0.85
Carbon black HAF 11.50-13.00
Oil base furnace black SRF 17.60-19.00
Silicon-nitrogen compound 5.50-6.80
Dimethyl phthalate 1.90-3.50
Dispersion agent T-78 0.80-1.20
Wetting agent 935P 0.50-0.70
Thiuram 0.10-0.30
Superoxide DCP 2.00-2.50
Sulphur 0.20-0.30
Two, mixing:
1, mixing reinforced order is:
At first 60/40 terpolymer EP rubber is rolled refining, adds following batching then successively:
The first step adds active zinc flower;
Second step added carbon black HAF, oil base furnace black SRF, silicon-nitrogen compound, dimethyl phthalate, dispersion agent T-78;
The 3rd step added organic active agent stearic acid, quinoline polymkeric substance RD, wetting agent 935P;
Add thiuram at last, superoxide DCP, sulphur;
2, mixing processing condition
As adopt mill; The roller temperature is 30-40 ℃, and mixing time is 20 minutes, and roll spacing is 1-5 centimetre;
As to adopt Banbury mixer, roller temperature be 70-80 ℃, and mixing time is 8 minutes;
Three, slice is parked
Sizing material mixing evenly after, put in storage behind the following sheet and park;
Four, injection:
Injection adopts rubber injection machine that the sizing material after mixing is injected mould, places the valve part that needs lining rubber in this mould, and sizing material is injected directly into needs the valve part of lining rubber surface;
During injection, the material feeding tube temperature of rubber injection machine is (40-50) ℃, and annotating plug pressure is (2.5-3.0) kg/cm
2
Five, sulfuration:
Curing temperature is (165-170) ℃, and curing time is (8-15) minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410020251 CN1733831A (en) | 2004-08-09 | 2004-08-09 | Valve bush rubber and its preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410020251 CN1733831A (en) | 2004-08-09 | 2004-08-09 | Valve bush rubber and its preparation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1733831A true CN1733831A (en) | 2006-02-15 |
Family
ID=36076465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410020251 Pending CN1733831A (en) | 2004-08-09 | 2004-08-09 | Valve bush rubber and its preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1733831A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101230248B (en) * | 2008-01-04 | 2010-06-16 | 丹阳市万奔汽车配件有限公司 | Sealing strip using EPDM rubber as host material and production method thereof |
| CN101423638B (en) * | 2008-12-05 | 2010-09-29 | 天津鹏翎胶管股份有限公司 | Electrochemical corrosion resistant inner ply compound formula |
| CN101284982B (en) * | 2008-05-30 | 2010-10-27 | 天津天石带压密封有限公司 | EPDM baseband press plugging sealant |
| CN101550254B (en) * | 2009-05-08 | 2012-10-03 | 尤建义 | Preparation technique of high temperature resistant, anti-corona high-resistance ethylene propylene terpolymer |
| CN103062376A (en) * | 2013-01-06 | 2013-04-24 | 沈阳化工大学 | Corrosion-resistant speed reducer box compositely made of terafluoroethylene-propylene rubber |
| CN109210218A (en) * | 2018-09-19 | 2019-01-15 | 姜日静 | A kind of manufacturing process of knife gate valve and valve body inner piece |
-
2004
- 2004-08-09 CN CN 200410020251 patent/CN1733831A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101230248B (en) * | 2008-01-04 | 2010-06-16 | 丹阳市万奔汽车配件有限公司 | Sealing strip using EPDM rubber as host material and production method thereof |
| CN101284982B (en) * | 2008-05-30 | 2010-10-27 | 天津天石带压密封有限公司 | EPDM baseband press plugging sealant |
| CN101423638B (en) * | 2008-12-05 | 2010-09-29 | 天津鹏翎胶管股份有限公司 | Electrochemical corrosion resistant inner ply compound formula |
| CN101550254B (en) * | 2009-05-08 | 2012-10-03 | 尤建义 | Preparation technique of high temperature resistant, anti-corona high-resistance ethylene propylene terpolymer |
| CN103062376A (en) * | 2013-01-06 | 2013-04-24 | 沈阳化工大学 | Corrosion-resistant speed reducer box compositely made of terafluoroethylene-propylene rubber |
| CN109210218A (en) * | 2018-09-19 | 2019-01-15 | 姜日静 | A kind of manufacturing process of knife gate valve and valve body inner piece |
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