CN111439957B - Preparation method of high-temperature-resistant vermiculite wire mesh woven packing - Google Patents
Preparation method of high-temperature-resistant vermiculite wire mesh woven packing Download PDFInfo
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- CN111439957B CN111439957B CN202010261154.1A CN202010261154A CN111439957B CN 111439957 B CN111439957 B CN 111439957B CN 202010261154 A CN202010261154 A CN 202010261154A CN 111439957 B CN111439957 B CN 111439957B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/30—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Other silicon-containing organic compounds; Boron-organic compounds
- C04B26/32—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Other silicon-containing organic compounds; Boron-organic compounds containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
- D04C1/00—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof
- D04C1/02—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof made from particular materials
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04C—BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE
- D04C1/00—Braid or lace, e.g. pillow-lace; Processes for the manufacture thereof
- D04C1/06—Braid or lace serving particular purposes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/26—Sealings between relatively-moving surfaces with stuffing-boxes for rigid sealing rings
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
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- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2251—Oxides; Hydroxides of metals of chromium
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- Textile Engineering (AREA)
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- Structural Engineering (AREA)
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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention discloses a preparation method of a high-temperature-resistant vermiculite wire mesh woven packing, which comprises the steps of batching, coating, knitting, weaving, shaping, spraying and the like, wherein the batching comprises expanded vermiculite, an adhesive, a dispersing agent, siloxane, a foaming agent and an inorganic filler. The invention also sprays protective agent on the outer surface of the packing to form a protective film, which can protect the packing, further improve the heat-resisting temperature to 1100 ℃, and ensure that the packing has good sealing performance and longer service life.
Description
Technical Field
The invention belongs to the technical field of sealing packing, and particularly relates to a preparation method of a high-temperature-resistant vermiculite wire mesh woven packing.
Background
Packing (braided packing), also called sealing packing, is usually braided from relatively soft threads, and strips, usually square or rectangular or circular in cross-section, are filled in a sealing cavity, thereby achieving sealing. The stuffing seal is firstly to prevent the liquid flow from leaking by the fiber plug such as cotton and hemp in the leakage passage, and is mainly used as the shaft seal of the water lifting machine. Packing is now widely used in centrifugal pumps, compressors, vacuum pumps, shaft seals for blenders and marine propellers, piston pumps, reciprocating compressors, reciprocating shaft seals for refrigerators, rotary seals for valve stems of various valves, and the like.
At present, the packing materials commonly used include flexible graphite, PTFE, aramid fiber and the like, and the packing materials have good sealing and chemical resistance. However, for the working condition of high temperature (more than 450 ℃), the material is not free from strength, and some temperature-resistant materials such as mica are poor in sealing property and processability.
Disclosure of Invention
Aiming at the technical problems, the invention provides a preparation method of a high-temperature-resistant vermiculite wire mesh woven packing.
The technical scheme of the invention is as follows: a preparation method of a high-temperature-resistant vermiculite wire mesh woven packing comprises the following steps:
(1) preparing materials: according to the weight components, 40-80 parts of expanded vermiculite, 5-15 parts of adhesive, 3-5 parts of dispersing agent, 1-5 parts of siloxane, 2-4 parts of foaming agent and 30-65 parts of inorganic filler are sequentially added into a solvent, fully homogenized and stirred, and hermetically mixed to obtain dispersed suspension slurry; the concentration of the dispersed suspension slurry is 25-50 wt%;
(2) coating: coating the dispersed suspension slurry on a release film by using a coating machine, drying to obtain a sealing film, and cutting the sealing film to obtain a sealing film strip;
(3) knitting: winding the sealing membrane strip with inconel silk on a knitting machine to prepare a knitting belt wrapped and wound by the inconel silk, wherein the inconel silk accounts for 25-30% of the total mass of the knitting belt;
(4) weaving: knitting the knitting belt into packing of different specifications on a packing knitting machine;
(5) shaping: placing the packing disc into a mold box coated with a release agent, placing the mold box into a vacuum drying box, adjusting the temperature to 195 + 250 ℃, and preserving the heat for 2-4 hours to gradually foam the finished packing in the mold box, and demolding after natural cooling to obtain a foamed packing;
(6) spraying: uniformly spraying a protective agent on the surface of the foaming packing, wherein the spraying quality of the protective agent is 3-5% of that of the foaming packing, and curing and drying at normal temperature to form a film to obtain a finished product.
Further, the inorganic filler comprises the following components in percentage by weight: 10-12% of talc, 7-9% of mica, 7-9% of glass fiber, 1-3% of graphene oxide, 8-10% of chopped refractory fiber, 3-5% of zirconium oxide and the balance of kaolin.
Further, the adhesive comprises any one of nitrile rubber, epoxy resin and polyurethane.
Further, the foaming agent is prepared from a chemical foaming agent azodicarbonamide and a physical foaming agent microsphere foaming powder according to the mass ratio of 0.3: 1, compounding. The physical foaming agent microsphere foaming powder has a solid structure, so that the packing can keep good sealing elasticity and certain mechanical strength after foaming, the chemical foaming agent azodicarbonamide further increases the toughness of the packing, the volume of the packing is increased and the mass of the packing is reduced by mixing the microsphere foaming powder and the azodicarbonamide, and the foaming agent is green, non-toxic and environment-friendly.
Further, the solvent is one or a mixture of more than two of acetone, N-dimethylformamide, tetrahydrofuran and cyclohexane.
Furthermore, the thickness of the sealing membrane strip is 0.3-1.5mm, the width is 2-20mm, and the diameter of the inconel filament is 0.1-0.2 mm.
Further, the model box includes end box, the separation blade is separated to the spiral, the closing cap, end box is cylindrical, the basal surface central point of end box puts and is equipped with the screw rod perpendicularly, the basal surface of end box uses the screw rod to be equipped with as the center and is used for grafting the spiral to separate the slot of separation blade, the spiral separates that the equidistance is equipped with the holding tank between the adjacent two rings of separation blade, the holding tank is used for holding the packing and foams, the center of closing cap is equipped with the screw hole, pass the screw rod lock joint with the screw hole on the closing cap and carry out the shutoff on end box, still there is the balance weight dish through threaded connection on the screw rod.
When the model box uses, at present, the spiral separates the fender and pegs graft in the slot of end box, and at end box bottom surface, the release agent is all smeared to the medial surface that the spiral separated the fender surface and closing cap, then coil the packing in separating the holding tank that the separation blade spirals the interval and go out around the screw, align the screw hole on the closing cap screw rod and screw in downwards until being spacing the end box that covers by spiral separated the fender, cover the counter weight dish on the screw rod with same precession mode and make it hug closely the closing cap upper surface, inject the foaming expansion volume of packing through the model box, utilize the counter weight dish to form certain additional pressure to the packing foaming, not only can obtain the neat and tight foaming packing of specification.
Furthermore, the volume of the accommodating groove is 1.2-1.5 times of the volume of the internal packing, the packing is more compact by limiting the external volume of foaming expansion, the gap rate formed by weaving the packing is reduced, and the sealing performance of the packing is further improved.
Further, the protective agent comprises the following components in percentage by weight: 22-26% of organic silicon resin, 0.5-1.0% of curing agent, 5.5-8.5% of chromium oxide, 2-4% of wetting agent, 1-3% of film-forming agent, 1-3% of dispersing agent and the balance of cyclohexane. The organic silicon resin adopts T8 diyne which can bear the high temperature of 1000 ℃, the chromium oxide can improve the wear resistance of the protective film, the heat-resistant temperature of the protective film can be further improved to 1100 ℃, the protective film formed by the protective agent can play a role in protecting a packing, the sealing performance of the protective film is further improved, and the service life of the protective film is prolonged.
Further, the release agent is prepared from dimethyl polysiloxane, vegetable oil and sorbitan according to the mass ratio of 73:22: 5. The release agent composed of the components has high temperature resistance effect and is easy to release.
The invention has the beneficial effects that: according to the invention, the packing is woven by adopting a material mainly containing expanded vermiculite, the packing is heated and expanded by adding a foaming agent, the foaming expansion volume of the packing is limited by using the model box, and the balance weight plate is adopted to foam the packing to form a certain external pressure, so that the foaming packing with regular and compact specification can be obtained, the compression permanent deformation rate is favorably reduced, and the bearing pressure is improved. In addition, the invention also sprays protective agent on the outer surface of the packing to form a protective film, which can protect the packing, further improve the heat-resisting temperature, the sealing performance and the service life of the packing. In a word, the packing prepared by the method has good flexibility and strength, and meanwhile, the problem of poor heat resistance of common materials such as graphite, PTFE rubber and the like can be solved, and the problem of poor sealing property of traditional heat-resistant materials such as mica, ceramic fiber and the like can also be solved.
Drawings
FIG. 1 is an overall cross-sectional view of the mold box of the present invention;
FIG. 2 is a top plan view of the back box of the present invention;
FIG. 3 is a schematic representation of a knitted ribbon of the present invention with a strip of sealing film wrapped with inconel filament;
fig. 4 is a schematic diagram of the packing woven by the knitted ribbon according to the invention.
Wherein, the box comprises a bottom 1, a spiral separation blade 2, a sealing cover 3, a screw rod 4, a slot 5, an accommodating groove 6, a threaded hole 7 and a counterweight plate 8.
Detailed Description
Example 1
A preparation method of a high-temperature-resistant vermiculite wire mesh woven packing comprises the following steps:
(1) preparing materials: according to the weight components, 30 parts of expanded vermiculite, 7 parts of adhesive, 3 parts of dispersant (DISPER-40715), 2 parts of siloxane and 43 parts of inorganic filler are sequentially added into a solvent, wherein the solvent is acetone, and one or a mixture of more than two of N, N-dimethylformamide, tetrahydrofuran and cyclohexane can also be adopted. Fully homogenizing, stirring and hermetically mixing to obtain dispersed suspension slurry; the concentration of the dispersed suspension slurry was 35 wt%; wherein, the inorganic filler comprises the following components in percentage by weight: 11% of talc, 7% of mica, 7% of glass fiber, 1% of graphene oxide, 8% of chopped refractory fiber, 3% of zirconium oxide and the balance of kaolin. The adhesive is nitrile rubber, and epoxy resin or polyurethane can also be adopted;
(2) coating: coating the dispersed suspension slurry on a release film by using a coating machine, drying to obtain a sealing film, and cutting the sealing film to obtain a sealing film strip;
(3) knitting: winding the sealing membrane strip with inconel wires on a knitting machine to prepare a knitting belt wrapped and wound by the inconel wire mesh, wherein the inconel wires account for 28 percent of the total mass of the knitting belt as shown in figure 3; wherein, the thickness of sealing membrane strip is 0.9mm, and the width is 10mm, and the diameter of inconel silk is 0.15 mm.
(4) Weaving: the knitting belt is knitted into packing of different specifications on a packing knitting machine, and the packing knitting schematic diagram of the embodiment is shown in fig. 4.
Example 2
(1) Preparing materials: according to the weight components, 60 parts of expanded vermiculite, 10 parts of adhesive, 4 parts of dispersing agent (DISPER-40715), 3 parts of siloxane, 3 parts of foaming agent and 47 parts of inorganic filler are sequentially added into a solvent, wherein the solvent is acetone, and one or a mixture of more than two of N, N-dimethylformamide, tetrahydrofuran and cyclohexane can also be adopted. Fully homogenizing, stirring and hermetically mixing to obtain dispersed suspension slurry; the concentration of the dispersed suspension slurry was 35 wt%; wherein, the inorganic filler comprises the following components in percentage by weight: 11% of talc, 8% of mica, 8% of glass fiber, 2% of graphene oxide, 9% of chopped refractory fiber, 4% of zirconium oxide and the balance of kaolin. The adhesive is nitrile rubber, and epoxy resin or polyurethane can also be adopted; the foaming agent is prepared from a chemical foaming agent azodicarbonamide and a physical foaming agent microsphere foaming powder according to the mass ratio of 0.3: 1, compounding. The physical foaming agent microsphere foaming powder has a solid structure, so that the packing can keep good sealing elasticity and certain mechanical strength after foaming, the chemical foaming agent azodicarbonamide further increases the toughness of the packing, the volume of the packing is increased and the mass of the packing is reduced by mixing the microsphere foaming powder and the azodicarbonamide, and the foaming agent is green, non-toxic and environment-friendly.
(2) Coating: coating the dispersed suspension slurry on a release film by using a coating machine, drying to obtain a sealing film, and cutting the sealing film to obtain a sealing film strip;
(3) knitting: winding the sealing membrane strip with inconel wires on a knitting machine to prepare a knitting belt wrapped and wound by the inconel wire mesh, wherein the inconel wires account for 28 percent of the total mass of the knitting belt as shown in figure 3; wherein, the thickness of sealing membrane strip is 0.9mm, and the width is 10mm, and the diameter of inconel silk is 0.15 mm.
(4) Weaving: the knitting belt is knitted into packing of different specifications on a packing knitting machine, and the packing knitting schematic diagram of the embodiment is shown in fig. 4.
(5) Shaping: and (3) placing the packing disc into a mold box coated with a release agent, placing the mold box into a vacuum drying box, adjusting the temperature to 230 ℃, preserving the heat for 3 hours to ensure that the finished packing is gradually foamed in the mold box, and naturally cooling and then demolding to obtain the foamed packing. The release agent is prepared from dimethyl polysiloxane, vegetable oil and sorbitan according to the mass ratio of 73:22: 5. The release agent composed of the components has high temperature resistance effect and is easy to release.
As shown in fig. 1-2, the model box includes a bottom box 1, a spiral separation blade 2, and a sealing cover 3, wherein the bottom box 1 is cylindrical, a screw rod 4 is vertically arranged at the center of the bottom surface of the bottom box 1, a slot 5 for inserting the spiral separation blade 2 is arranged on the bottom surface of the bottom box 1 by taking the screw rod 4 as the center, an accommodating groove 6 is arranged between two adjacent circles of the spiral separation blade 2 at equal distance, the accommodating groove 6 is used for accommodating a packing for foaming, a threaded hole 7 is arranged at the center of the sealing cover 3, the threaded hole 7 on the sealing cover 3 penetrates through the screw rod 4 to be buckled on the bottom box 1 for plugging, and a balance weight disk 8 is further connected to the screw rod 4 through threads.
When the model box uses, separate the separation blade 2 with the spiral now and peg graft in slot 5 of end box 1, and 1 bottom surface at the end box, the release agent is all paintd to the medial surface that the separation blade 2 surface and closing cap 3 are separated to the spiral, then coil the packing in separating the holding tank 6 that the separation blade 2 coiled the interval goes out by the spiral around screw rod 4, the volume of holding tank 6 is 1.2-1.5 times of inside packing volume, make the packing inside inseparabler through the outside volume of restriction foaming inflation, reduce the gap rate that the packing woven the formation, thereby further improve the sealing performance of packing. The threaded hole 7 on the seal cover 3 is aligned with the screw rod 4 and screwed downwards until the threaded hole is limited by the spiral separation blade 2 to cover the bottom box 1, the balance weight disk 8 is sleeved on the screw rod 4 in the same screwing mode to be tightly attached to the upper surface of the seal cover 3, the foaming expansion volume of the packing is limited by the model box, certain external pressure is formed by foaming the packing through the balance weight disk 8, and the foaming packing with the neat and compact specification can be obtained.
Example 3
This embodiment is substantially the same as embodiment 2 except that: the embodiment also comprises a step (6) of spraying after the step (5) of shaping, wherein a protective agent is uniformly sprayed on the surface of the foaming packing, the spraying mass of the protective agent is 4% of the mass of the foaming packing, and the protective agent is cured and dried at normal temperature to form a film, so that a finished product is obtained; the protective agent comprises the following components in percentage by weight: 24% of organic silicon resin, 0.7% of curing agent, 7% of chromium oxide, 3% of wetting agent, 2% of film forming agent, 2% of dispersing agent and the balance of cyclohexane. The organic silicon resin adopts T8 diyne which can bear the high temperature of 1000 ℃, the chromium oxide can improve the wear resistance of the protective film, the heat-resistant temperature of the protective film can be further improved to 1100 ℃, the protective film formed by the protective agent can play a role in protecting a packing, the sealing performance of the protective film is further improved, and the service life of the protective film is prolonged. The wetting agent, the film forming agent and the dispersing agent are all conventional products sold in the market.
Examples of the experiments
The finished packing prepared in examples 1 to 3 was subjected to a sealing performance test, and the test results are shown in table 1:
and (4) conclusion: from the comparison of the embodiments 1 to 3, it can be seen that the finished packing prepared in the embodiment 3 has good performance, and can achieve good sealing performance under the sealing working conditions of dynamic and static states, such as the sealing of a flange surface and the sealing of a stuffing box of a valve. Can well replace the high-temperature application of packing made of graphite and mica.
Claims (9)
1. A preparation method of a high-temperature-resistant vermiculite wire mesh woven packing is characterized by comprising the following steps:
(1) preparing materials: according to the weight components, 40-80 parts of expanded vermiculite, 5-15 parts of adhesive, 3-5 parts of dispersing agent, 1-5 parts of siloxane, 2-4 parts of foaming agent and 30-65 parts of inorganic filler are sequentially added into a solvent, fully homogenized and stirred, and hermetically mixed to obtain dispersed suspension slurry; the concentration of the dispersed suspension slurry is 25-50 wt%;
(2) coating: coating the dispersed suspension slurry on a release film by using a coating machine, drying to obtain a sealing film, and cutting the sealing film to obtain a sealing film strip;
(3) knitting: winding the sealing membrane strip with inconel wires on a knitting machine to prepare a knitting belt wrapped and wound by the inconel wire mesh, wherein the inconel wires account for 25-30% of the total mass of the knitting belt;
(4) weaving: knitting the knitting belt into packing of different specifications on a packing knitting machine;
(5) shaping: placing the packing into a mold box coated with a release agent, placing the mold box into a vacuum drying box, adjusting the temperature to 195-250 ℃, and preserving the heat for 2-4 hours to gradually foam the finished packing in the mold box, and demolding after natural cooling to obtain a foamed packing;
(6) spraying: and uniformly spraying a protective agent on the surface of the foaming packing, wherein the spraying quality of the protective agent is 3-5% of that of the foaming packing, and curing and drying at normal temperature to form a film to obtain a finished product.
2. The method for preparing the high-temperature-resistant vermiculite wire mesh woven packing according to claim 1, wherein the inorganic filler comprises the following components in percentage by weight: 10-12% of talc, 7-9% of mica, 7-9% of glass fiber, 1-3% of graphene oxide, 8-10% of chopped refractory fiber, 3-5% of zirconium oxide and the balance of kaolin.
3. The method for preparing the high-temperature-resistant vermiculite-wire-mesh woven packing according to claim 1, wherein the adhesive comprises any one of nitrile rubber, epoxy resin and polyurethane.
4. The method for preparing the high-temperature-resistant vermiculite-metal wire mesh woven packing as claimed in claim 1, wherein the foaming agent is prepared from a chemical foaming agent azodicarbonamide and a physical foaming agent microsphere foaming powder in a mass ratio of 0.3: 1, compounding.
5. The method for preparing the high-temperature-resistant vermiculite wire mesh woven packing according to claim 1, wherein the solvent is one or a mixture of more than two of acetone, N-dimethylformamide, tetrahydrofuran and cyclohexane.
6. The method for preparing the high-temperature-resistant vermiculite wire mesh woven packing set according to claim 1, wherein the thickness of the sealing membrane strip is 0.3-1.5mm, the width of the sealing membrane strip is 2-20mm, and the diameter of the inconel wire is 0.1-0.2 mm.
7. The preparation method of the high-temperature-resistant vermiculite metal wire mesh woven packing set according to claim 1, wherein the model box in the step (5) comprises a bottom box (1), a spiral separation blade (2) and a sealing cover (3), the bottom box (1) is cylindrical, a screw rod (4) is vertically arranged at the central position of the bottom surface of the bottom box (1), a slot (5) for inserting the spiral separation blade (2) is arranged on the bottom surface of the bottom box (1) by taking the screw rod (4) as the center, accommodating grooves (6) are equidistantly arranged between two adjacent circles of the spiral separation blade (2), the accommodating grooves (6) are used for accommodating the packing set for foaming, a threaded hole (7) is arranged at the center of the sealing cover (3), and the threaded hole (7) on the sealing cover (3) is buckled on the bottom box (1) through the screw rod (4) for sealing, the screw rod (4) is also connected with a balance weight plate (8) through threads.
8. The method for preparing the high-temperature-resistant vermiculite wire mesh woven packing according to claim 1, wherein the protective agent comprises the following components in percentage by weight: 22-26% of organic silicon resin, 0.5-1.0% of curing agent, 5.5-8.5% of chromium oxide, 2-4% of wetting agent, 1-3% of film-forming agent, 1-3% of dispersing agent and the balance of cyclohexane.
9. The method for preparing the high-temperature-resistant vermiculite wire mesh woven packing according to claim 1, wherein the release agent is prepared from dimethyl polysiloxane, vegetable oil and sorbitan according to a mass ratio of 73:22: 5.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000002337A (en) * | 1998-06-18 | 2000-01-07 | Ishikawajima Harima Heavy Ind Co Ltd | Seal structure |
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| CN107032739A (en) * | 2017-06-17 | 2017-08-11 | 合肥市晨雷思建筑材料科技有限公司 | A kind of insulation material and preparation method thereof |
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| JP2000002337A (en) * | 1998-06-18 | 2000-01-07 | Ishikawajima Harima Heavy Ind Co Ltd | Seal structure |
| JP2007155016A (en) * | 2005-12-06 | 2007-06-21 | Nippon Valqua Ind Ltd | Dovetail groove sealing material and vacuum gate valve mounted therewith |
| CN107188453A (en) * | 2017-05-23 | 2017-09-22 | 武汉理工大学 | A kind of preparation method of vermiculite based high-temp-resistant encapsulant |
| CN110304861A (en) * | 2019-07-18 | 2019-10-08 | 佛山市高明金石建材有限公司 | A kind of quartz of high compactness and preparation method thereof |
| CN110803888A (en) * | 2019-11-20 | 2020-02-18 | 杨云 | Vermiculite sealing material for high-temperature fuel cell |
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