KR101676864B1 - Composition for non-asbestos gasket with high heat resistance - Google Patents
Composition for non-asbestos gasket with high heat resistance Download PDFInfo
- Publication number
- KR101676864B1 KR101676864B1 KR1020150120290A KR20150120290A KR101676864B1 KR 101676864 B1 KR101676864 B1 KR 101676864B1 KR 1020150120290 A KR1020150120290 A KR 1020150120290A KR 20150120290 A KR20150120290 A KR 20150120290A KR 101676864 B1 KR101676864 B1 KR 101676864B1
- Authority
- KR
- South Korea
- Prior art keywords
- weight
- parts
- composition
- gasket
- fiber
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/02—Copolymers with acrylonitrile
-
- C08K3/0033—
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/06—Elements
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K3/1006—Materials in mouldable or extrudable form for sealing or packing joints or covers characterised by the chemical nature of one of its constituents
- C09K3/1018—Macromolecular compounds having one or more carbon-to-silicon linkages
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The present invention relates to a high heat resistant non-asbestos gasket composition, and more particularly to a high heat resistant non-asbestos gasket composition which comprises a reinforcing fiber (aramid fiber, glass fiber), a filler, (1) to (3), wherein the additive for general gaskets and the cross-linking agent are mixed, carbon fibers are further mixed in addition to the reinforcing fibers, heat resistant non-asbestos gasket composition that has a low gas permeability and a high residual stress of 28 MPa or more by using bis (t-butylperoxy) 3,3,5-trimethylcyclohexane and ZDA (zinc diacrylate) .
Description
(Aramid fiber, glass fiber), a filler, a general gasket additive and a crosslinking agent are mixed with a base material obtained by mixing hydrogenated nitrile butadiene rubber (HNBR) and nitrile butadiene rubber (NBR) (T-butylperoxy) 3,3,5-trimethylcyclohexane and 1,1-bis (tert-butylperoxy) 3,3,5-trimethylcyclohexane and Heat resistant non-asbestos gasket composition which has a low gas permeability and a high residual heat resistance of 28 MPa or more by using ZDA (zinc diacrylate).
Generally, a gasket is a component intended to seal various fluids in a corresponding passage or apparatus. Recently, a non-asbestos gasket not containing asbestos has been mainly used.
On the other hand, in the conventional non-asbestos gasket composition, it is general to knead nitrile rubber swelled with an organic solvent, non-asbestos inorganic fiber, rubber additive, vulcanizing agent and inorganic filler and heat-roll them between hot and cold rolls to produce gaskets .
The patent document 1 is related to a non-asbestos-based sheet gasket, which is constructed so that fibers, graphite, and rubber are stirred with water and laminated and integrated in accordance with a hot press to produce a sheet gasket. Patent Document 2 discloses a joint sheet using fibers other than asbestos and a method of manufacturing the same, and is configured to produce a joint sheet by kneading a fiber, a rubber expanded by a solvent, an active rubber clay, or an acid clay, have. Patent Document 3 discloses a composition for forming a joint sheet, a joint sheet, and a method for producing the same, wherein the composition using non-asbestos inorganic fibers, nitrile rubber, and toluene as an organic solvent is heated and rolled between hot and cold rolls to produce a joint sheet Consists of. Patent Document 4 relates to a method of manufacturing a joint sheet, which is a method of manufacturing a joint sheet produced by putting a mixture obtained by mixing glass fibers, polyamide fibers, natural rubber dissolved in an organic solvent or a synthetic rubber and a filler between cold and hot rolls The seat is open.
However, in order to improve the mechanical strength and heat resistance of the non-asbestos gasket, it is common to use a rubber composition which is swollen in an organic solvent to mix excess filler and fibers. However, the use of a rubber composition through swelling in such an organic solvent has an advantage that an excessive amount of filler can be used, but the mechanical strength of the rubber is lowered and the heat resistance is lowered due to swelling. Further, the crosslinking method of the gasket sheet of the above-mentioned technology has a characteristic that the heat resistance is weaker than that of the peroxide crosslinking method by the sulfur crosslinking method.
Patent Document 5, which was filed and filed by the applicant of the present invention, relates to a non-asbestos sheet and a gasket composition, which comprises 60 to 80 parts by weight of an acrylonitrile butadiene rubber, 10 to 20 parts by weight of a high-density polyethylene resin, 20 to 100 parts by weight of a reinforcing fiber, 10 to 50 parts by weight of silica, 1 to 5 parts by weight of a silane coupling agent, 2 to 5 parts by weight of a metal oxide, 1 to 2 parts by weight of stearic acid, 200 to 600 parts by weight of a filler, and 2 to 5 parts by weight of a peroxide crosslinking agent by a press molding method.
However, in the case of Patent Document 5, heat resistance is comparatively excellent as compared with a conventional gasket sheet production method using an organic solvent in a press molding method by peroxide crosslinking without using an organic solvent. However, Ronitrilbutadiene rubber, high-density polyethylene resin, and natural rubber have problems in that the heat resistance of the gasket sheet is still unsatisfactory because the heat-resistant temperature is low.
The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a reinforcing fiber (aramid fiber, glass fiber), a filler, a general gasket additive and a crosslinking agent Bis (t-butylperoxy) 3,3,5-trimethylcyclohexane (crosslinking agent) is added at the time of crosslinking, 3,3,5-trimethylcyclohexane) and ZDA (zinc diacrylate), it is required to have a high heat resistance with a residual stress of 28 MPa or more while having a low gas permeability.
The present invention provides a non-asbestos gasket composition comprising 50 to 100 parts by weight of reinforcing fibers, 10 to 30 parts by weight of carbon fibers, 50 to 100 parts by weight of fillers 50 to 100 parts by weight of a base material composed of 30 to 50% by weight of HNBR and 50 to 70% To 300 parts by weight, an additive for gaskets, and a cross-linking agent.
The reinforcing fiber is preferably used alone or in combination with the aramid fiber or the glass fiber. The filler is preferably used alone or in combination of two or more of kaolin, barium sulfate, mica or silica, The additive is preferably composed of 1 to 5 parts by weight of zinc oxide, 1 to 3 parts by weight of stearic acid and 1 to 3 parts by weight of an antioxidant based on 100 parts by weight of the base material.
The crosslinking agent is preferably composed of 4 to 8 parts by weight of 1,1-bis (tert-butylperoxy) 3,3,5-trimethylchlorohexane and 1 to 6 parts by weight of ZDA based on 100 parts by weight of the base material.
The present invention has an effect that the maximum continuous operating temperature of the gasket can be used at a high temperature of 300 占 폚 or more and has a high gas permeability and a high heat resistance of a residual stress of 28 Mpa or more.
It should be noted that the present invention is directed to a high heat resistant asbestos gasket composition which is only required to understand the technical structure of the present invention, and the description of other portions will be omitted so as not to obscure the gist of the present invention.
The high heat resistant non-asbestos gasket composition according to the present invention will now be described.
The heat resistant non-asbestos gasket composition according to the present invention comprises 50 to 100 parts by weight of reinforcing fibers, 10 to 30 parts by weight of carbon fibers, 10 to 30 parts by weight of carbon fibers, 50 to 300 parts by weight of a filler, an additive for gaskets and a cross-linking agent.
The nitrile butadiene rubber (NBR) is a known material widely used in a gasket composition and has an effect of improving oil resistance. HNBR (hydrogenated nitrile butadiene rubber) is mixed to improve mechanical properties and heat resistance of a gasket. And the degree of hydrogenation is very variable according to the amount of the catalyst and the reaction conditions, so that it is not particularly limited, and all kinds of known HNBR can be applied.
On the other hand, if the content of HNBR is less than 30% by weight, the effect of improving the heat resistance may be insufficient. If the content exceeds 50% by weight, the oil resistance may be lowered.
The reinforcing fiber is added to reinforce the mechanical properties of the gasket and can be used alone or in combination with aramid fiber or glass fiber. If the content of reinforcing fiber is less than 50 parts by weight, there is a fear that the reinforcing effect will be insufficient If the amount is more than 100 parts by weight, there is a problem that the workability of the composition increases as the viscosity of the composition increases.
Meanwhile, in the present invention, carbon fibers are further mixed in addition to the above reinforcing fibers to further improve heat resistance. As the carbon fiber, a pan type carbon fiber is used for improving dispersibility and heat resistance, but a chopped fiber carbon fiber having a length of 3 to 6 mm is used. If the content of the carbon fibers is less than 10 parts by weight, the heat resistance reinforcing effect may be insufficient. If the content of the carbon fibers exceeds 30 parts by weight, the workability due to the viscosity increase of the composition may be deteriorated.
The filler is added in order to improve the mechanical properties and heat resistance of the gasket. It is used alone or in combination of two or more of kaolin, barium sulfate, mica or silica. When the content of the filler is less than 50 parts by weight, There is a possibility that the composition may be insufficient, and if it exceeds 300 parts by weight, there is a problem that the workability of the composition is deteriorated.
The additive for gaskets is not limited to a specific kind and content as an additive which has been widely used in the technical field, and various well known additives capable of constituting the gasket composition can be applied. For example, in the present invention, 1 to 5 parts by weight of zinc oxide, 1 to 3 parts by weight of stearic acid, and an antioxidant (RD (Taian Flying Chemical Co.), Naugard 445 (Uniroyal Chemical Co.), VESTENAMER 1 to 3 parts by weight), which is usually used in the gasket composition.
The cross-linking agent may also be a variety of known cross-linking agents, which are essentially used in the technical field. In the present invention, in consideration of the realization of low gas permeability, heat resistance and crosslinking, (T-butylperoxy) 3,3,5-trimethylcyclohexane and ZDA (zinc diacrylate) for improving the crosslinking thereof are used.
On the other hand, when the content of 1,1-bis (tert-butylperoxy) 3,3,5-trimethylclohexane is less than 4 parts by weight, crosslinking is not properly carried out and gaskets are not properly produced and heat resistance is poor If it exceeds 8 parts by weight, there is a possibility that the appearance of the gasket becomes poor due to over-crosslinking.
If the content of ZDA is less than 1 part by weight, the effect of improving the degree of crosslinking deteriorates and the effect of improving the heat resistance may be deteriorated. If the content is more than 6 parts by weight, the flexibility of the gasket is deteriorated, Bubbles may be generated.
Hereinafter, the present invention will be described more specifically based on examples, but the present invention is not limited by the following examples.
1. Manufacture of gaskets
(Example 1)
50 parts by weight of aramid fibers, 10 parts by weight of carbon fibers cut into 3 mm, 50 parts by weight of kaolin and barium sulfate, 1 part by weight of zinc oxide, 1 part by weight of stearic acid 1 1 part by weight of 1,1-bis (tert-butylperoxy) 3,3,5-trimethylcyclohexane and 1 part by weight of ZDA were added to a kneader for compound (Niugard 445 (Uniroyal Chemical Co.) At 110 DEG C for about 12 minutes to prepare a compound. The finished compound is then homogeneously blended in an open roll mill to produce a compound on a 2 mm sheet. The thus-prepared sheet-like compound was put into a mold having a mold thickness of 2 mm, press molded at 160 DEG C under 150 kg / cm < 2 > for about 10 minutes, and then heat treated at 200 DEG C for 1 hour to prepare a gasket.
(Example 2)
100 parts by weight of glass fiber, 30 parts by weight of carbon fiber cut to 6 mm, 300 parts by weight of mica and silica, 5 parts by weight of zinc oxide, 3 parts by weight of stearic acid 8 parts by weight of 1,1-bis (tert-butylperoxy) 3,3,5-trimethylcyclohexane and 6 parts by weight of ZDA were kneaded in a kneader which is a compound kneader, 110 parts by weight of an antioxidant (VESTENAMER (Degussa) Lt; 0 > C for about 12 minutes to prepare a compound. The finished compound is then homogeneously blended in an open roll mill to produce a compound on a 2 mm sheet. The thus-prepared sheet-like compound was put into a mold having a mold thickness of 2 mm, press molded at 160 DEG C under 150 kg / cm < 2 > for about 10 minutes, and then heat treated at 200 DEG C for 1 hour to prepare a gasket.
(Comparative Example 1)
(Ethylene propylene rubber) was used instead of HNBR, and carbon fiber was not used. As a crosslinking agent, 1,1-bis (tert-butylperoxy) 3,3,5-trimethyl Gaskets were prepared using dicumyl peroxide without using chlorohexane and ZDA.
(Comparative Example 2)
(Ethylene propylene rubber) was used instead of HNBR, and carbon fiber was not used. As a crosslinking agent, 1,1-bis (tert-butylperoxy) 3,3,5-trimethyl Gaskets were prepared using dicumyl peroxide without using chlorohexane and ZDA.
2. Evaluation of Gasket
The gaskets prepared in Examples 1 and 2 and Comparative Examples 1 and 2 were evaluated by the items and methods as shown in Table 1 below, and the results are also shown in Table 1 below.
(Residual stress)
(Gas permeability)
(Thickness increase)
-Oyl No.3-
(Compressibility)
(Flexibility)
(Recovery)
(Tensile Strength)
The gasket fitted with the recommended surface pressure (400 kgf / cm 2 if not specified) maintains the temperature at the set temperature for 3 days, then, after cooling to room temperature, maintains the pressure at 10 kgf / cm 2 for 10 minutes, Measure
As shown in Table 1, the gaskets according to Examples 1 and 2 of the present invention can be used at a maximum continuous operating temperature of 300 ° C or higher as compared with Comparative Examples 1 and 2, It can be seen that the stress has a high heat resistance of 28 Mpa or more.
As described above, the high heat resistant non-asbestos gasket composition according to the present invention is described through the preferred embodiments and its superiority is confirmed. However, those skilled in the art will recognize that the scope and spirit of the present invention It will be understood that the invention can be variously modified and changed without departing from the spirit and scope of the invention.
Claims (5)
50 to 100 parts by weight of a reinforcing fiber, 10 to 30 parts by weight of a carbon fiber, 50 to 300 parts by weight of a filler, 50 to 300 parts by weight of a reinforcing fiber, 50 to 300 parts by weight of a filler, Respectively,
The reinforcing fiber is used either alone or in combination with aramid fiber or glass fiber,
The filler may be used alone or in combination with two or more of kaolin, barium sulfate, mica or silica,
Wherein the additive for gaskets comprises 1 to 5 parts by weight of zinc oxide, 1 to 3 parts by weight of stearic acid and 1 to 3 parts by weight of an antioxidant based on 100 parts by weight of the base material,
Wherein the crosslinking agent comprises 4 to 8 parts by weight of 1,1-bis (tert-butylperoxy) 3,3,5-trimethylcyclohexane and 1 to 6 parts by weight of ZDA based on 100 parts by weight of the base material. High heat resistant non-asbestos gasket composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150120290A KR101676864B1 (en) | 2015-08-26 | 2015-08-26 | Composition for non-asbestos gasket with high heat resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150120290A KR101676864B1 (en) | 2015-08-26 | 2015-08-26 | Composition for non-asbestos gasket with high heat resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR101676864B1 true KR101676864B1 (en) | 2016-11-17 |
Family
ID=57542332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020150120290A KR101676864B1 (en) | 2015-08-26 | 2015-08-26 | Composition for non-asbestos gasket with high heat resistance |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR101676864B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101754646B1 (en) * | 2016-11-25 | 2017-07-06 | 제일이엔에스(주) | A gasket of low specific gravity using a water soluble organic binder |
| KR102149756B1 (en) * | 2019-04-29 | 2020-09-01 | (주)태화칼파씰 | Method for continuously Manufacturing a non-asbestos gasket |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05162157A (en) | 1991-01-28 | 1993-06-29 | Nichias Corp | Manufacture of joint sheet |
| JPH0953062A (en) * | 1995-08-14 | 1997-02-25 | Nichias Corp | Joint sheet and production thereof |
| JP2000034467A (en) | 1998-07-21 | 2000-02-02 | Nippon Valqua Ind Ltd | Joint sheet-forming composition, joint sheet and its preparation |
| JP2005281463A (en) | 2004-03-29 | 2005-10-13 | Nichias Corp | Joint sheet and method for producing the same |
| JP2008195881A (en) * | 2007-02-15 | 2008-08-28 | Nok Corp | Hydrogenated nbr composition |
| JP2008274053A (en) | 2007-04-26 | 2008-11-13 | Nippon Pillar Packing Co Ltd | Sheet gasket |
| KR101326558B1 (en) | 2011-07-11 | 2013-11-20 | 한국신발피혁연구원 | A composite for non-asbestos sheet and gasket |
| JP5592400B2 (en) * | 2009-12-25 | 2014-09-17 | 日信工業株式会社 | Seal member |
| US20150080517A1 (en) * | 2013-09-17 | 2015-03-19 | Nike, Inc. | Dynamically crosslinked thermoplastic material process |
-
2015
- 2015-08-26 KR KR1020150120290A patent/KR101676864B1/en active IP Right Grant
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05162157A (en) | 1991-01-28 | 1993-06-29 | Nichias Corp | Manufacture of joint sheet |
| JPH0953062A (en) * | 1995-08-14 | 1997-02-25 | Nichias Corp | Joint sheet and production thereof |
| JP2000034467A (en) | 1998-07-21 | 2000-02-02 | Nippon Valqua Ind Ltd | Joint sheet-forming composition, joint sheet and its preparation |
| JP2005281463A (en) | 2004-03-29 | 2005-10-13 | Nichias Corp | Joint sheet and method for producing the same |
| JP2008195881A (en) * | 2007-02-15 | 2008-08-28 | Nok Corp | Hydrogenated nbr composition |
| JP2008274053A (en) | 2007-04-26 | 2008-11-13 | Nippon Pillar Packing Co Ltd | Sheet gasket |
| JP5592400B2 (en) * | 2009-12-25 | 2014-09-17 | 日信工業株式会社 | Seal member |
| KR101326558B1 (en) | 2011-07-11 | 2013-11-20 | 한국신발피혁연구원 | A composite for non-asbestos sheet and gasket |
| US20150080517A1 (en) * | 2013-09-17 | 2015-03-19 | Nike, Inc. | Dynamically crosslinked thermoplastic material process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101754646B1 (en) * | 2016-11-25 | 2017-07-06 | 제일이엔에스(주) | A gasket of low specific gravity using a water soluble organic binder |
| KR102149756B1 (en) * | 2019-04-29 | 2020-09-01 | (주)태화칼파씰 | Method for continuously Manufacturing a non-asbestos gasket |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1985657B1 (en) | Hydrogenated nbr composition | |
| KR20170130700A (en) | Organic-inorganic hybrid composite for non-asbestos gasket with high heat resistance and manufacturing method of composite for gasket using the same | |
| CN106967299A (en) | A kind of low compression set silicon rubber and preparation method thereof | |
| US7173087B2 (en) | Hydrogenated nitrile rubber composition | |
| KR20070092649A (en) | Process for producing sheet-shaped gasket | |
| KR101326558B1 (en) | A composite for non-asbestos sheet and gasket | |
| KR20150044842A (en) | Nbr composition | |
| JP2610145B2 (en) | Rubber composition | |
| KR101676864B1 (en) | Composition for non-asbestos gasket with high heat resistance | |
| KR101666055B1 (en) | Manufacturing method of composite for gasket using the organic-inorganic hybrid composite for non-asbestos gasket with high heat resistance | |
| EP1990360A1 (en) | Nbr composition | |
| KR101261574B1 (en) | Manufacturing method for non-asbestos sheet and gasket | |
| KR101798392B1 (en) | manufacturing method of rubber gasket using the Rubber gasket composition of the plate type Heat Exchanger for high temperature steam with fluororubber | |
| CN105985543A (en) | Rubber composition and preparation method thereof | |
| JP5230107B2 (en) | Tire vulcanization bladder | |
| KR101793662B1 (en) | Mold for vessel expansion joint with a packing seal structure | |
| CN104497584A (en) | Silicone rubber and preparation method thereof | |
| KR102308733B1 (en) | Non-asbestos gasket composition having excellent heat resistant and manufacturing method of gasket using the same | |
| KR20150112462A (en) | Compression sheet type gasket composition using aramid fibers are contained in the master batch and methods for preparing the same | |
| KR100812840B1 (en) | A rubber composition for tire bladder | |
| KR101174389B1 (en) | Rubber composition for cure bladder with improved release effect and method for preparation thereof | |
| KR101230058B1 (en) | Manufacturing method of diffuser membrane for improved elasticity and durability and high efficiency diffuser membrane using thereof | |
| CN106046568A (en) | Graft modified polyethylene anti-wear and enhanced EPDM rubber sealing strip | |
| KR20150125816A (en) | The rubber composition for automobile hoses and the cooling of the composition using a cooling hose | |
| KR101776413B1 (en) | Nano zinc oxide filled weather strip rubber composition and weather strip for car using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| E701 | Decision to grant or registration of patent right | ||
| GRNT | Written decision to grant |