CN111234334A - Asbestos-free sealing gasket and preparation method thereof - Google Patents
Asbestos-free sealing gasket and preparation method thereof Download PDFInfo
- Publication number
- CN111234334A CN111234334A CN202010159792.2A CN202010159792A CN111234334A CN 111234334 A CN111234334 A CN 111234334A CN 202010159792 A CN202010159792 A CN 202010159792A CN 111234334 A CN111234334 A CN 111234334A
- Authority
- CN
- China
- Prior art keywords
- asbestos
- sealing gasket
- parts
- free sealing
- graphene
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L13/00—Compositions of rubbers containing carboxyl groups
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the technical field of sealing, in particular to an asbestos-free sealing gasket and a preparation method thereof. The preparation raw materials comprise, by weight, 15-20 parts of thermoplastic rubber, 5-12 parts of aromatic polyamide, 20-60 parts of filler, 1-5 parts of functional assistant and 0.5-5 parts of vulcanizing agent; the functional auxiliary agent is graphene. The non-asbestos sealing gasket is environment-friendly in raw materials, does not use harmful solvents containing benzene and the like, and does not pollute the environment. In addition, the asbestos-free sealing gasket has excellent mechanical property of sealing performance, and can be widely applied to sealing in the fields of petrochemical industry, steel smelting, drilling platforms, oil and gas exploitation, shipbuilding, papermaking, electric power, pharmacy, general machinery and the like.
Description
Technical Field
The invention relates to the technical field of sealing, in particular to an asbestos-free sealing gasket and a preparation method thereof.
Background
Asbestos sealing materials have been the typical choice for gasket materials for many years because asbestos fibers have excellent load-bearing capacity, chemical, pressure and high temperature resistance, large surface area, good adsorption properties, and the like. Since asbestos is found to be carcinogenic, environmental protection against asbestos is being promoted all over the world, and the preparation of asbestos-free gasket composite materials from asbestos-free fibers instead of asbestos fibers is a necessary trend in the sealing field. The development of asbestos-free gasket composite materials has made certain progress over decades. However, since the asbestos-free fiber is often replaced without achieving the broad performance of asbestos fiber, the asbestos-free mat composite is designed with much more complex design considerations than conventional asbestos mats. Because the preparation process is complicated, a plurality of process flows and process parameters are uncertain, the production quality of the prior asbestos-free gasket is often unstable, and the interior of the polymer has larger stress relaxation, thereby causing the problems that the sealing performance of the asbestos-free sealing gasket is poor and the mechanical property is weakened along with the lapse of time.
Disclosure of Invention
Aiming at the technical problem, the invention provides an asbestos-free sealing gasket, which comprises the following raw materials, by weight, 15-20 parts of thermoplastic rubber, 5-12 parts of aromatic polyamide, 20-60 parts of filler, 1-5 parts of functional assistant and 0.5-5 parts of vulcanizing agent; the functional auxiliary agent is graphene.
As a preferable technical solution, the graphene is an aminated modified graphene.
As a preferable technical scheme, the nitrogen content of the aminated modified graphene is 5-12 wt%.
As a preferable technical scheme, the aminated modified graphene is tetraethylenepentamine-modified graphene.
In a preferred embodiment, the aromatic polyamide is a p-phenylene terephthalamide fiber.
As a preferred technical scheme, the thermoplastic rubber comprises nitrile rubber and carboxylated nitrile rubber.
As a preferred embodiment, the carboxylated nitrile rubber is present in an amount of at least 30 wt.% of the thermoplastic rubber.
As a preferred technical scheme, the content of the carboxylated nitrile rubber at least accounts for 30-55 wt% of the thermoplastic rubber.
In a second aspect, the present invention provides a method for preparing the asbestos-free sealing gasket, which comprises the following steps:
(1) mixing thermoplastic rubber, aromatic polyamide, filler and functional auxiliary agent according to the weight part ratio, and carrying out high-speed centrifugal rotary banburying;
(2) adding a vulcanizing agent into the banburied raw materials, and rolling the mixture into a sheet material in an open mill;
(3) and (3) placing the sheet material in a vulcanizing press mold, heating to 180-200 ℃, curing for 3-5 minutes under the pressure of 8-20 MPa, discharging, and performing post-treatment to obtain the asbestos-free sealing gasket.
A third aspect of the invention provides the use of a non-asbestos sealing gasket as described above in the field of sealing technology.
The non-asbestos sealing gasket is environment-friendly in raw materials, does not use harmful solvents containing benzene and the like, and does not pollute the environment. In addition, the asbestos-free sealing gasket has excellent mechanical property of sealing performance, and can be widely applied to sealing in the fields of petrochemical industry, steel smelting, drilling platforms, oil and gas exploitation, shipbuilding, papermaking, electric power, pharmacy, general machinery and the like.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the stated number clearly indicates that the singular form is intended.
The invention provides an asbestos-free sealing gasket, which comprises the following raw materials, by weight, 15-20 parts of thermoplastic rubber, 5-12 parts of aromatic polyamide, 20-60 parts of filler, 1-5 parts of functional auxiliary agent and 0.5-5 parts of vulcanizing agent; the functional auxiliary agent is graphene.
The thermoplastic rubber is abbreviated as TPE (thermoplastic elastomer) and is a high polymer material which shows rubber elasticity at normal temperature and is plastic when being heated. The thermoplastic rubber is not particularly limited in kind and composition, and includes but is not limited to nitrile rubber, natural rubber, ethylene propylene diene monomer, chloroprene rubber, styrene-butadiene rubber, silicone rubber, fluororubber, etc.
In some embodiments, the thermoplastic rubber comprises nitrile rubber and carboxylated nitrile rubber.
The nitrile rubber is prepared from butadiene and acrylonitrile by an emulsion polymerization method, is mainly produced by a low-temperature emulsion polymerization method, and has the advantages of excellent oil resistance, higher wear resistance, better heat resistance and strong bonding force.
The carboxylated nitrile rubber is prepared by ternary polymerization of butadiene, acrylonitrile and organic acid (acrylic acid, methacrylic acid and the like). Due to the introduction of carboxylation, nitrile rubber molecules are activated, the polarity of nitrile rubber is enhanced, the oil resistance of nitrile rubber is improved, and better mechanical properties can be maintained under the high-temperature working condition of nitrile rubber. In addition, due to the introduction of the carboxylated nitrile rubber, the raw materials for preparing the asbestos-free sealing gasket can be better dispersed and fused with each other, and strong hydrogen bond acting force can be formed between the raw materials and functional additives such as modified graphene while agglomeration between the raw materials is avoided, so that the sealing gasket microstructure is more compact, and the sealing effect and the mechanical property are further remarkably improved.
Further, the carboxylated nitrile rubber is present in an amount of at least 30 wt% of the thermoplastic rubber.
Further, the content of the carboxylated nitrile rubber at least accounts for 30-55 wt% of the thermoplastic rubber.
Further, the carboxylated nitrile rubber is present in an amount of at least 45 wt% of the thermoplastic rubber.
The carboxylated nitrile rubber of the present invention is commercially available, for example, Lanzhou petrochemical carboxylated liquid nitrile rubber SKD, and the like.
The arrangement mode of the carbon atoms in the graphene (graphene) is sp-like the arrangement mode of the graphene monoatomic layer2The hybrid orbit is bonded and has the following characteristics: the carbon atom having 4 valence electrons, 3 of which form sp2Bonds, i.e., each carbon atom contributes an unbound electron located on the pz orbital, the pz orbitals of neighboring atoms perpendicular to the plane can form pi bonds, and the newly formed pi bonds are in a half-filled state. Research proves that the coordination number of carbon atoms in the graphene is 3, and every two adjacent carbon atomsThe bond length between the subunits is 1.42X 10-10Rice, the included angle between the keys is 120 degrees. In addition to the honeycomb-like layered structure in which the σ bond is linked to other carbon atoms in a hexagonal ring, the pz orbital of each carbon atom perpendicular to the plane of the layer can form a large pi bond (similar to a benzene ring) of multiple atoms throughout the entire layer, thus having excellent electrical conductive and optical properties. The graphene in the present invention can be purchased from the market, such as 100019 of Jiangsu Xiancheng nanomaterial science and technology company Limited.
In some embodiments, the graphene is an aminated modified graphene.
Further, the nitrogen content of the aminated modified graphene is 5-12 wt%.
Further, the aminated modified graphene is tetraethylenepentamine modified graphene.
The aromatic polyamide is a linear polymer which is prepared by aromatic diamine, aromatic diacid/diacid chloride and the like through polycondensation, and a molecular chain contains benzene ring groups and amido bonds. The aromatic polyamide has excellent mechanical properties due to its highly linear structure and high benzene ring-containing rigid structure. In the present invention, the specific type of the aromatic polyamide is not particularly limited, and para-phenylene terephthalamide, meta-phenylene isophthalamide, etc. may be used.
In some embodiments, the aromatic polyamide is a para-phenylene terephthalamide fiber.
The filler is not particularly limited in the present invention, and includes, but is not limited to, white carbon black, black carbon black, calcium carbonate, barium sulfate, kaolin, attapulgite, hard china clay, nano zinc oxide, magnesium carbonate, bentonite, zeolite powder, mica powder, coal gangue powder, and the like.
In the present invention, the specific components of the vulcanizing agent are not particularly limited, and include, but are not limited to, sulfur.
In addition, under the premise of not reducing the comprehensive performance of the asbestos-free sealing gasket, auxiliaries such as a heat stabilizer, an ultraviolet absorbent, a flame retardant, a plasticizer, an antioxidant and the like can be added.
The heat stabilizer is not particularly limited, and there may be mentioned: the heat stabilizer comprises basic lead salts, metal soaps, organic tin, organic compounds, polyhydric alcohols and composite stabilizers.
Examples of salt-based lead salt-based heat stabilizers include, but are not limited to: dibasic lead stearate, tribasic lead sulfate, dibasic lead phthalate, dibasic lead phosphite, tribasic lead maleate, basic lead carbonate, basic lead sulfate, basic lead sulfite, lead silicate, coprecipitated basic lead silicate-lead sulfate, coprecipitated orthosilicate-silica gel, chlorosilicate lead compound, chlorophthalic lead silicate, basic sulpho phosphite compound, basic chlorosilicate lead-lead sulfate compound, basic thioester lead-phthalate, tetrabasic lead fumarate, lead salicylate.
The plasticizer is not particularly limited, and there may be mentioned: phthalates, glutarates, adipates, azelates, sebacates, phosphates, stearates, laurates, citrates, oleates, trimellitates, epoxy derivatives, sulfonic acid derivatives, polyol derivatives, maleates, fumarates, itaconates.
The ultraviolet absorber is not particularly limited, and there may be mentioned: benzotriazole-based ultraviolet absorbers such as 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (2-hydroxy-5-butylphenyl) benzotriazole, 2- (2-hydroxy-5-octylphenyl) benzotriazole, 2- (3-tert-butyl-2-hydroxy-5-methylphenyl) -5-chlorobenzotriazole, and 2- (3, 5-di-tert-amyl-2-hydroxyphenyl) benzotriazole; benzophenone-based ultraviolet absorbers such as 2-hydroxy-4-methoxybenzophenone and 2-hydroxy-4-n-octyloxybenzophenone; triazine-based ultraviolet absorbers such as 2- [4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazin-2-yl ] -5- (octyloxy) phenol and 2- (4, 6-diphenyl-1, 3, 5-triazin-2-yl) -5- (hexyloxy) phenol; and salicylate-based ultraviolet absorbers such as p-tert-butyl salicylate and phenyl salicylate.
The flame retardant is not particularly limited, and there may be mentioned: guanidine phosphate, ammonium phosphate, melamine phosphate, triphenyl phosphate, tris (2, 3-dichloropropyl) phosphate, ammonium polyphosphate, phosphate, tricresyl phosphate, trichloroethyl phosphoric acid, and the like.
The antioxidant is not particularly limited, and there may be mentioned: and antioxidants such as phosphorus compounds including copper compounds, organic or inorganic halogen compounds, hindered phenols, hindered amines, hydrazines, sulfur compounds, sodium hypophosphite, potassium hypophosphite, calcium hypophosphite, and magnesium hypophosphite.
In a second aspect, the present invention provides a method for preparing the asbestos-free sealing gasket, which comprises the following steps:
(1) mixing thermoplastic rubber, aromatic polyamide, filler and functional auxiliary agent according to the weight part ratio, and carrying out high-speed centrifugal rotary banburying;
(2) adding a vulcanizing agent into the banburied raw materials, and rolling the mixture into a sheet material in an open mill;
(3) and (3) placing the sheet material in a vulcanizing press mold, heating to 180-200 ℃, curing for 3-5 minutes under the pressure of 8-20 MPa, discharging, and performing post-treatment to obtain the asbestos-free sealing gasket.
A third aspect of the invention provides the use of a non-asbestos sealing gasket as described above in the field of sealing technology.
Examples
Example 1: provides a non-asbestos sealing gasket, which comprises the following raw materials of 20 parts by weight of thermoplastic rubber, 8 parts by weight of aromatic polyamide, 45 parts by weight of filler, 3 parts by weight of functional auxiliary agent and 3 parts by weight of vulcanizing agent; the functional auxiliary agent is graphene.
The thermoplastic rubber is a mixture of nitrile rubber and carboxylated nitrile rubber, and the weight ratio is 55: 45, a first step of; the carboxylated nitrile rubber is carboxyl liquid nitrile rubber SKD of Lanzhou petrochemical rubber; the aromatic polyamide is aramid fiber 1414; the filler is a mixture of white carbon black and mica powder barium sulfate, and the weight ratio is 2: 2: 3; the graphene is 100019 tetraethylenepentamine modified graphene of Jiangsu Xiancheng nano material science and technology limited; the vulcanizing agent is sulfur.
The preparation method of the asbestos-free sealing gasket comprises the following steps:
(1) mixing thermoplastic rubber, aromatic polyamide, filler and functional auxiliary agent according to the weight part ratio, and carrying out high-speed centrifugal rotary banburying;
(2) adding a vulcanizing agent into the banburied raw materials, and rolling the mixture into a sheet material in an open mill;
(3) and (3) placing the sheet material in a vulcanizing press mold, heating to 190 ℃, curing for 4 minutes under the pressure of 12MPa, discharging, cutting and molding to obtain the asbestos-free sealing gasket.
The compression ratio of the asbestos-free sealing gasket in the embodiment is 10.09%, the tensile strength is 19.6MPa, the resilience is 62%, and after the heat treatment at 300 ℃ for 12 overnight, the resilience is basically unchanged, and the excellent sealing effect is still kept.
Example 2: provides a non-asbestos sealing gasket, which comprises the following raw materials of 20 parts by weight of thermoplastic rubber, 8 parts by weight of aromatic polyamide, 45 parts by weight of filler, 3 parts by weight of functional auxiliary agent and 3 parts by weight of vulcanizing agent; the functional auxiliary agent is graphene.
The thermoplastic rubber is nitrile rubber; the aromatic polyamide is aramid fiber 1414; the filler is a mixture of white carbon black and mica powder barium sulfate, and the weight ratio is 2: 2: 3; the graphene is 100019 tetraethylenepentamine modified graphene of Jiangsu Xiancheng nano material science and technology limited; the vulcanizing agent is sulfur.
The preparation method of the asbestos-free sealing gasket comprises the following steps:
(1) mixing thermoplastic rubber, aromatic polyamide, filler and functional auxiliary agent according to the weight part ratio, and carrying out high-speed centrifugal rotary banburying;
(2) adding a vulcanizing agent into the banburied raw materials, and rolling the mixture into a sheet material in an open mill;
(3) and (3) placing the sheet material in a vulcanizing press mold, heating to 190 ℃, curing for 4 minutes under the pressure of 12MPa, discharging, cutting and molding to obtain the asbestos-free sealing gasket.
The compression ratio of the asbestos-free sealing gasket in the embodiment is 14.11%, the tensile strength is 15.2MPa, the resilience is 52%, and after the sealing gasket is subjected to heat treatment at 300 ℃ for 12 overnight, the shape of the sealing gasket is obviously changed, and the resilience is poor.
Example 3: provides a non-asbestos sealing gasket, which comprises the following raw materials of 20 parts by weight of thermoplastic rubber, 8 parts by weight of aromatic polyamide, 45 parts by weight of filler, 3 parts by weight of functional auxiliary agent and 3 parts by weight of vulcanizing agent; the functional auxiliary agent is graphene.
The thermoplastic rubber is carboxylated nitrile rubber; the carboxylated nitrile rubber is carboxyl liquid nitrile rubber SKD of Lanzhou petrochemical rubber; the aromatic polyamide is aramid fiber 1414; the filler is a mixture of white carbon black and mica powder barium sulfate, and the weight ratio is 2: 2: 3; the graphene is 100019 tetraethylenepentamine modified graphene of Jiangsu Xiancheng nano material science and technology limited; the vulcanizing agent is sulfur.
The preparation method of the asbestos-free sealing gasket comprises the following steps:
(1) mixing thermoplastic rubber, aromatic polyamide, filler and functional auxiliary agent according to the weight part ratio, and carrying out high-speed centrifugal rotary banburying;
(2) adding a vulcanizing agent into the banburied raw materials, and rolling the mixture into a sheet material in an open mill;
(3) and (3) placing the sheet material in a vulcanizing press mold, heating to 190 ℃, curing for 4 minutes under the pressure of 12MPa, discharging, cutting and molding to obtain the asbestos-free sealing gasket.
The compression ratio of the asbestos-free sealing gasket in the embodiment is 9.80%, the tensile strength is 17.8MPa, the resilience is 53%, and the resilience is basically not changed after the heat treatment at 300 ℃ for 12 overnight.
Example 4: provides a non-asbestos sealing gasket, which comprises the following raw materials of 20 parts by weight of thermoplastic rubber, 8 parts by weight of aromatic polyamide, 45 parts by weight of filler, 3 parts by weight of functional auxiliary agent and 3 parts by weight of vulcanizing agent; the functional auxiliary agent is graphene.
The thermoplastic rubber is a mixture of nitrile rubber and carboxylated nitrile rubber, and the weight ratio is 55: 45, a first step of; the carboxylated nitrile rubber is carboxyl liquid nitrile rubber SKD of Lanzhou petrochemical rubber; the aromatic polyamide is aramid fiber 1414; the filler is a mixture of white carbon black and mica powder barium sulfate, and the weight ratio is 2: 2: 3; the graphene is a single layer 102296 of Jiangsu Xiancheng nano material science and technology limited; the vulcanizing agent is sulfur.
The preparation method of the asbestos-free sealing gasket comprises the following steps:
(1) mixing thermoplastic rubber, aromatic polyamide, filler and functional auxiliary agent according to the weight part ratio, and carrying out high-speed centrifugal rotary banburying;
(2) adding a vulcanizing agent into the banburied raw materials, and rolling the mixture into a sheet material in an open mill;
(3) and (3) placing the sheet material in a vulcanizing press mold, heating to 190 ℃, curing for 4 minutes under the pressure of 12MPa, discharging, cutting and molding to obtain the asbestos-free sealing gasket.
The compression ratio of the asbestos-free sealing gasket in the embodiment is 12.70%, the tensile strength is 17.4MPa, the resilience is 50%, and the resilience of the asbestos-free sealing gasket is not obviously changed after the asbestos-free sealing gasket is subjected to heat treatment at 300 ℃ for 12 overnight.
Example 5: provides a non-asbestos sealing gasket, which comprises the following raw materials of 20 parts by weight of thermoplastic rubber, 8 parts by weight of aromatic polyamide, 45 parts by weight of filler, 3 parts by weight of functional auxiliary agent and 3 parts by weight of vulcanizing agent; the functional auxiliary agent is graphene.
The thermoplastic rubber is a mixture of nitrile rubber and carboxylated nitrile rubber, and the weight ratio is 55: 45, a first step of; the carboxylated nitrile rubber is carboxyl liquid nitrile rubber SKD of Lanzhou petrochemical rubber; the aromatic polyamide is aramid fiber 1414; the filler is a mixture of white carbon black and mica powder barium sulfate, and the weight ratio is 2: 2: 3; the graphene is 100015 octadecylamine modified aminated graphene (nitrogen content is 3.11 wt%) of Jiangsu Xiancheng nano material science and technology limited; the vulcanizing agent is sulfur.
The preparation method of the asbestos-free sealing gasket comprises the following steps:
(1) mixing thermoplastic rubber, aromatic polyamide, filler and functional auxiliary agent according to the weight part ratio, and carrying out high-speed centrifugal rotary banburying;
(2) adding a vulcanizing agent into the banburied raw materials, and rolling the mixture into a sheet material in an open mill;
(3) and (3) placing the sheet material in a vulcanizing press mold, heating to 190 ℃, curing for 4 minutes under the pressure of 12MPa, discharging, cutting and molding to obtain the asbestos-free sealing gasket.
The compression ratio of the asbestos-free sealing gasket in the embodiment is 13.3%, the tensile strength is 16.4MPa, the resilience is 66%, and after the heat treatment at 300 ℃ for 12 overnight, the shape of the asbestos-free sealing gasket is changed, and the resilience is obviously influenced.
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.
Claims (10)
1. The asbestos-free sealing gasket is characterized by comprising the following raw materials, by weight, 15-20 parts of thermoplastic rubber, 5-12 parts of aromatic polyamide, 20-60 parts of filler, 1-5 parts of functional auxiliary agent and 0.5-5 parts of vulcanizing agent; the functional auxiliary agent is graphene.
2. The asbestos-free sealing gasket of claim 1, wherein the graphene is an aminated modified graphene.
3. The asbestos-free sealing gasket of claim 2, wherein the nitrogen content of the aminated modified graphene is 5-12 wt%.
4. The asbestos-free sealing gasket of claim 2 or 3, wherein the aminated modified graphene is tetraethylenepentamine modified graphene.
5. The asbestos-free sealing gasket of any one of claims 1 to 4, wherein the aromatic polyamide is a para-phenylene terephthalamide fiber.
6. The asbestos-free sealing gasket of any one of claims 1 to 5, wherein said thermoplastic rubber comprises nitrile rubber and carboxylated nitrile rubber.
7. The asbestos-free sealing gasket of claim 7, wherein said carboxylated nitrile rubber is present in an amount of at least 30 weight percent of the thermoplastic rubber.
8. The asbestos-free sealing gasket of claim 7, wherein said carboxylated nitrile rubber is present in an amount of at least 30 to 55 wt.% of the thermoplastic rubber.
9. The method for preparing the asbestos-free sealing gasket according to any one of claims 1 to 8, comprising the following steps:
(1) mixing thermoplastic rubber, aromatic polyamide, filler and functional auxiliary agent according to the weight part ratio, and carrying out high-speed centrifugal rotary banburying;
(2) adding a vulcanizing agent into the banburied raw materials, and rolling the mixture into a sheet material in an open mill;
(3) and (3) placing the sheet material in a vulcanizing press mold, heating to 180-200 ℃, curing for 3-5 minutes under the pressure of 8-20 MPa, discharging, and performing post-treatment to obtain the asbestos-free sealing gasket.
10. Use of the asbestos-free sealing gasket according to any of claims 1 to 8 in the field of sealing technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010159792.2A CN111234334A (en) | 2020-03-10 | 2020-03-10 | Asbestos-free sealing gasket and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010159792.2A CN111234334A (en) | 2020-03-10 | 2020-03-10 | Asbestos-free sealing gasket and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111234334A true CN111234334A (en) | 2020-06-05 |
Family
ID=70873582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010159792.2A Withdrawn CN111234334A (en) | 2020-03-10 | 2020-03-10 | Asbestos-free sealing gasket and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111234334A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114524981A (en) * | 2022-03-17 | 2022-05-24 | 盘锦大奔金蚁橡胶制品有限公司 | Aramid fiber reinforced ether type polymer composite material, preparation method and application |
| CN116200061A (en) * | 2022-12-01 | 2023-06-02 | 上海夏宁新材料科技有限公司 | Graphene-zinc powder composite material and preparation method thereof |
-
2020
- 2020-03-10 CN CN202010159792.2A patent/CN111234334A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114524981A (en) * | 2022-03-17 | 2022-05-24 | 盘锦大奔金蚁橡胶制品有限公司 | Aramid fiber reinforced ether type polymer composite material, preparation method and application |
| CN116200061A (en) * | 2022-12-01 | 2023-06-02 | 上海夏宁新材料科技有限公司 | Graphene-zinc powder composite material and preparation method thereof |
| CN116200061B (en) * | 2022-12-01 | 2023-11-21 | 上海夏宁新材料科技有限公司 | Graphene-zinc powder composite material and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111234334A (en) | Asbestos-free sealing gasket and preparation method thereof | |
| KR101539709B1 (en) | Poly(phenylene sulfide)/poly(ethylene terephthalate) Blend Resin Composition Having High Strength and Method for Preparing the Same | |
| KR101323507B1 (en) | Flame-retardant polyamide composition | |
| CN107325357B (en) | A kind of transparent high thermoplasticity neoprene pipe and preparation method thereof | |
| JPWO2009110480A1 (en) | Flame retardant resin composition | |
| CN105837963B (en) | A kind of butyl rubber composite material applied to curing bag | |
| EP1619427A1 (en) | Gasket sheet and method for manufacturing same | |
| CN104292524A (en) | Modified natural rubber cable sheath material | |
| CN106497043A (en) | Fire-retardant enhancing copolyamide composite and preparation method thereof | |
| JP4744911B2 (en) | High thermal conductive resin composition | |
| CN109054395B (en) | High-temperature-resistant halogen-free flame-retardant silicone rubber and preparation method thereof | |
| CN103013005A (en) | Rubber resistant to hydrochloric acid corrosion | |
| WO2018155411A1 (en) | Polyester elastomer resin composition | |
| JP2021172675A (en) | Polyphenylene sulfide resin composition and molding | |
| CN103613913A (en) | Halogen-free flame-retardant thermoplastic polyester elastomer material and preparation method thereof | |
| JP6361352B2 (en) | Polyamide elastomer composition and molded body using the same | |
| CN115135722B (en) | Polyarylene sulfide resin composition | |
| JP2007106854A (en) | Thermally conductive resin composition | |
| CN110713642A (en) | Chloroprene rubber sole | |
| CN101245180A (en) | Leadless non-nickel epichlorohydrin rubber sizing material | |
| KR102059777B1 (en) | Conductive filaments for 3D printer and manufacturing method thereof | |
| CN114644830A (en) | Polyarylene sulfide resin composition | |
| CN110746669A (en) | Novel high-temperature-resistant flame-retardant rubber material and production process thereof | |
| CN115803368A (en) | Method for suppressing burrs of polyarylene sulfide resin composition | |
| CN110628143A (en) | Fluorine-chlorine elastomer material with various excellent performances and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200605 |
|
| WW01 | Invention patent application withdrawn after publication |