WO2019227535A1

WO2019227535A1 - High-temperature resistant, soft and flexible sealing gasket, preparation method thereof, and use thereof

Info

Publication number: WO2019227535A1
Application number: PCT/CN2018/091743
Authority: WO
Inventors: 刘开琪; 孙广超; 熊瑞; 陈运法
Original assignee: 中国科学院过程工程研究所
Priority date: 2018-05-29
Filing date: 2018-06-19
Publication date: 2019-12-05
Also published as: CN108928052A; CN108928052B

Abstract

The present invention provides a high-temperature resistant, soft and flexible sealing gasket, a preparation method thereof, and a use thereof. The sealing gasket includes heat-resistant fiber fabric members and a binder slurry. The heat-resistant fiber fabric members are laminated on each other. The binder slurry is provided between adjacent heat-resistant fiber fabric members and at an outer side of the outermost heat-resistant fiber fabric member. The binder slurry comprises the following components, in parts by weight: 50-70 parts of aqueous polyurethane, 10-35 parts of epoxy resin emulsion, 10-15 parts of filler, 1-5 parts of aluminium sol-gel, and 0.5-1 parts of dispersant. The preparation method comprises: 1) preparing a binder slurry; 2) adding the binder slurry from step 1) to adhesion surfaces of heat-resistant fiber fabric members, laminating the heat-resistant fiber fabric members that have been combined with the binder slurry, and molding the same to obtain a sealing gasket. The high-temperature resistant, soft and flexible sealing gasket of the present invention can be used in a high temperature environment for a long time.

Description

High-temperature-resistant flexible elastic gasket and preparation method and application thereof

Technical field

The present disclosure belongs to the field of inorganic non-metal composite materials, and particularly relates to a high-temperature-resistant flexible elastic gasket and a preparation method and application thereof.

Background technique

In recent years, with the continuous development of petrochemical, metallurgy, environmental protection and other industries, higher and higher requirements for the high temperature and high pressure resistance of high-temperature dust-containing gas separation devices have been put forward. One of the important factors of continuous time operation. In the industrial production process, the use of environmental temperature that does not match the sealing material or under thermal overload conditions will accelerate the aging, embrittlement, etc. of the sealing material. The sealing technology of the pipe under high temperature conditions is particularly important, which is also important for the sealing material. Temperature resistance and sealing performance put forward more demanding requirements.

The flexible and elastic sealing technology below 600 ℃ is relatively mature, but the development of high-temperature resistant flexible and elastic sealing materials that have been used for a long time at a high temperature of 700 ~ 1000 ℃ is still lacking.

CN106188897A discloses a high-temperature-resistant ethylene-propylene rubber gasket and a preparation method and application thereof. In this solution, the high-temperature-resistant ethylene-propylene rubber gasket is composed of a binary ethylene-propylene rubber, furnace black, spray carbon black, and zinc oxide. , Alumina, vulcanizing agent, cross-linking agent and antioxidant, etc., which uses fully saturated ethylene-propylene rubber as the rubber raw material.

CN204852334U discloses a high-temperature sealed graphite gasket. The graphite gasket includes a metal inner ring and a metal outer ring. A graphite ring is embedded between the metal inner ring and the metal outer ring. The thickness of the graphite ring is greater than The thickness of the metal inner ring and the metal outer ring. The metal inner ring is an arc-shaped concave structure, the metal outer ring is an arc-shaped convex structure, and the graphite ring is provided with a metal inner ring and a metal outer ring. Curved protrusions.

CN202684067U discloses a refractory fiber gasket. The refractory fiber gasket is made of refractory fiber material and has excellent elasticity on the surface. It is suitable for changing the shape of the plug nozzle, and can effectively seal the plug nozzle.

However, the above three solutions cannot be used for a long time at a high temperature of 700 to 1000 ° C.

In the high-temperature dust-containing flue gas purification technology, high-temperature seals between heterogeneous pipe fittings are usually filled and sealed with refractory fiber cotton and felt, but because of the soft texture, low strength, and poor continuity of fiber cotton and felt, it is easy to break during installation , Resulting in uneven force, poor sealing effect. Under long-term high-temperature operation and mechanical vibration during the backflushing process, due to the poor temperature resistance of the material, the aging is severe, and gas leakage is prone to occur, which has a great adverse effect on the purification efficiency of high-temperature dusty flue gas. In order to solve this technical problem, it is urgent to develop a high-strength, high-temperature-resistant, flexible and elastic sealing material.

Summary of the Invention

The following is an overview of the subject matter described in detail in this disclosure. This summary is not intended to limit the scope of protection of the claims.

Aiming at the problems in the prior art that sealing materials are easily powdered at high temperatures, have poor sealing effects, low mechanical strength, and short life, the purpose of this disclosure is to provide a high-temperature-resistant flexible elastic gasket and a method for preparing the same. And uses. The high-temperature-resistant flexible elastic gasket provided by the present disclosure can be used for a long time in a high-temperature environment.

To achieve the above purpose, the present disclosure adopts the following technical solutions:

In a first aspect, the present disclosure provides a gasket including a refractory fiber cloth and a binder slurry, the refractory fiber cloth is superimposed on each other, and the binder slurry is located between adjacent refractory fiber cloths and The outer side of the outermost refractory fiber cloth;

The binder slurry includes the following components in parts by weight:

In the present disclosure, the binder slurry is 50 to 70 parts by weight, such as 50 parts, 52 parts, 55 parts, 57 parts, 60 parts, 62 parts, 65 parts, 68 parts by weight. Parts or 70 parts, etc., but it is not limited to the listed values, and other unlisted values within this range are also applicable.

The weight of the epoxy resin emulsion is 10 to 35 parts, for example, 10 parts, 13 parts, 16 parts, 18 parts, 20 parts, 22 parts, 25 parts, 28 parts, 30 parts, 33 parts, or 35 parts, etc., but It is not limited to the listed values, and other unlisted values within the range are also applicable.

The weight parts of the filler are 10-15 parts, for example, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, or 15 parts, etc., but it is not limited to the listed values, and other unlisted values in the range are the same Be applicable.

The weight fraction of the aluminum sol is 1 to 5 parts, for example, 1 part, 2 parts, 3 parts, 4 parts, or 5 parts, etc., but it is not limited to the listed values, and other unlisted values in this range are also applicable.

The weight part of the dispersant is 0.5 to 1 part, for example, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, or 1 part, etc., but it is not limited to the listed values, and other unlisted values within this value range The same applies.

In the gasket provided by the present disclosure, the synergy between the binder slurry and the refractory fiber cloth cooperates with each other, so that the overall performance of the gasket is significantly enhanced. Specifically, the present disclosure forms a binder slurry by mixing water-based polyurethane, epoxy resin emulsion, vermiculite particles, mullite short fibers, zirconia short fibers, aluminum sol, and dispersant to ensure adhesiveness and environmental protection. At the same time, it effectively improves the mechanical strength of the material. It has high strength at normal temperature, does not harden, and has good flexibility and brittleness at high temperature, which can better meet the high temperature flexibility of the material. The material has high mechanical strength. At the same time, the multilayer fiber can self-adjust the rigid point stress it receives under pressure and thermal stress. Through gap compensation and excellent corrosion resistance, the material's sealing performance is improved.

Compared with ordinary refractory fiber cotton and felt, the high-temperature-resistant flexible elastic gasket in the present disclosure has superior properties such as high strength, uniform thickness, and good continuity. It can withstand the axial vibration caused by pulse back blowing and dust removal. The thermal stress between the buffer ceramic film and the steel plate provides reliable fixed connection and sealing performance, and also has the advantages of simple manufacturing process and low cost. More importantly, the types of composite products have various forms, which can be made into various shapes, sizes, thicknesses, etc., with low thermal conductivity, non-combustion, high strength-to-weight ratio, good chemical stability, and good retention at high temperatures. Flexibility and other characteristics. The high-temperature-resistant flexible elastic gasket provided by the present disclosure can be used for a long time in an environment of 700-1000 ° C.

The following is a preferred technical solution of the present disclosure, but is not a limitation on the technical solution provided by the present disclosure. Through the following preferred technical solutions, the technical objectives and beneficial effects of the present disclosure can be better achieved and realized.

In the present disclosure, a refractory fiber cloth is used as a base material of a gasket.

As a preferred technical solution of the present disclosure, in the gasket, the refractory fiber cloth includes any one or a combination of at least two of high-silica fiber cloth, quartz fiber cloth, or aluminum silicate fiber cloth. The high-silica fiber cloth is an abbreviation of high-purity silicon oxide amorphous continuous fiber cloth, and its silicon oxide content is 96-98%.

Preferably, in the sealing pad, the weaving manner of the refractory fiber cloth includes, but is not limited to, any one or a combination of at least two of plain weave, twill weave, or satin. However, it is not limited to the above-mentioned weaving methods, and other common weaving methods in the art that can achieve the same effect can also be used in the present disclosure.

As a preferred technical solution of the present disclosure, in the gasket, the binder slurry includes the following components in parts by weight:

Preferably, in the sealing pad, the binder slurry includes the following components in parts by weight:

Preferably, the filler comprises any one or a combination of at least two of vermiculite particles, mullite short fibers, or zirconia short fibers. Typical but non-limiting combinations are: a combination of vermiculite particles and mullite short fibers, a combination of mullite short fibers and zirconia short fibers, a combination of vermiculite particles and zirconia short fibers, vermiculite particles, A combination of short stone fibers and short zirconia fibers. In the present disclosure, the length of the short fibers is 100-500 μm.

The present disclosure adds vermiculite particles, which can effectively increase the temperature resistance performance of the material and extend the use temperature range of the gasket through the dispersion distribution. The present disclosure adds mullite short fibers and zirconia short fibers. They are scattered in different layers between the fiber cloth layers to play a supporting role to improve the resilience of the material.

Preferably, the dispersant includes a dodecylbenzene sulfonate, an alkyl diphenyl ether monosulfonate, an alkyl diphenyl ether disulfonate, an alcohol ether sulfonate, or a phenol ether sulfonate. Any one or a combination of at least two. However, it is not limited to the above-mentioned dispersants, and other common dispersants that can achieve the same effect in the art can also be used in this disclosure, such as other types of anionic surfactants.

In a second aspect, the present disclosure provides a method for preparing a gasket according to the first aspect, the method comprising the following steps:

(1) preparing a binder slurry;

(2) The binder slurry obtained in step (1) is compounded on the side of the refractory fiber cloth that needs to be bonded, and then the obtained refractory fiber cloth with the binder slurry is superimposed, and finally processed to form the seal. pad.

The preparation method provided by the present disclosure has readily available raw materials, environmental protection, simple preparation process, and is suitable for industrial application. The thickness can be controlled by controlling the number of layers of the refractory fiber cloth, and the shape can be controlled by controlling the processing and forming mold.

As a preferred technical solution of the present disclosure, in step (1), the preparation of the binder slurry includes the following steps:

A proportion of a water-based polyurethane, an epoxy resin emulsion, an aluminum sol, and a dispersant are mixed to obtain a mixed emulsion, and a proportion of a filler is added to the mixed emulsion to obtain the binder slurry after dispersion.

As a preferred technical solution of the present disclosure, the dispersant includes, but is not limited to, dodecylbenzenesulfonate, alkyldiphenyl ether monosulfonate, alkyldiphenyl ether disulfonate, and alcohol ether sulfonate Or any one or a combination of at least two of phenol ether sulfonates.

Preferably, the method of mixing comprises stirring.

Preferably, the method of dispersion comprises any one or a combination of at least two of ultrasonic dispersion, stirring or ball milling. Typical but non-limiting combinations are: a combination of ultrasonic dispersion and stirring, a combination of stirring and ball milling, a combination of ultrasonic dispersion and ball milling, and the like.

As a preferred technical solution of the present disclosure, in step (2), the refractory fiber cloth includes any one or a combination of at least two of high-silica fiber cloth, quartz fiber cloth, or aluminum silicate fiber cloth. The high-silica fiber cloth is an abbreviation of high-purity silicon oxide amorphous continuous fiber cloth, and its silicon oxide content is 96-98%.

Preferably, in the step (2), the method for compounding the binder slurry obtained in the step (1) on the surface to be bonded of the refractory fiber cloth is coating or dipping.

Preferably, in the step (2), the amount of the binder slurry compounded on the surface to be bonded of the refractory fiber cloth is 0.01 to 0.5 g / cm ² , for example, 0.01 g / cm ² , 0.05 g / cm ² , 0.1 g ^{^{/ cm 2, 0.2g / cm 2}} , 0.3g / cm 2, 0.4g / cm 2 or 0.5g / cm ² and the like, but are not limited to the exemplified values, other unrecited number within the numerical range applies.

Preferably, in step (2), the superimposing method is to laminate the refractory fiber cloth compounded with the binder slurry in multiple layers and then press-dry it or bake the refractory fiber cloth compounded with the binder slurry in a single layer. After drying, multiple layers of pressure are stacked. In the present disclosure, the multilayer refers to ≥ 2 layers.

Preferably, the pressing pressure is 1 to 10 MPa, for example, 1 MPa, 2 MPa, 3 MPa, 4 MPa, 5 MPa, 6 MPa, 7 MPa, 8 MPa, 9 MPa, or 10 MPa, etc., but is not limited to the listed values. Unlisted values also apply.

Preferably, in step (2), the method of processing and forming is die cutting.

As a preferred technical solution of the present disclosure, in step (2), the refractory fiber cloth is compounded with a binder slurry after pretreatment.

Preferably, the pretreatment is a desizing treatment.

Preferably, the method for the desizing treatment includes drying and / or heating at 600 ° C. after ultrasonic vibration in ethanol. In the present disclosure, the drying after ultrasonic vibration in ethanol and / or heating at 600 ° C. means that drying may be performed after ultrasonic vibration in ethanol, heating may be performed at 600 ° C., or drying after ultrasonic vibration in ethanol may be used. A combination of dry and 600 ° C heating.

As a further preferred technical solution of the preparation method according to the present disclosure, the method includes the following steps:

(1) Mixing a proportion of a water-based polyurethane, an epoxy resin emulsion, an aluminum sol, and a dispersant to obtain a mixed emulsion, and adding a proportion of a filler to the mixed emulsion to obtain the binding agent after dispersion. Slurry

(2) Compounding the binder slurry obtained in step (1) by coating or impregnating it on the surface of the desizing-treated refractory fiber cloth to be bonded, and then combining the obtained refractory fiber with the binder slurry The cloths are superimposed, and finally die-cut to obtain the sealing gasket;

The amount of the binder slurry compounded on the surface to be bonded of the refractory fiber cloth is 0.01 to 0.5 g / cm ² , and the superimposing method is to stack the refractory fiber cloth compounded with the binder slurry in multiple layers, and then Pressure drying or single-layer drying of the refractory fiber cloth combined with the binder slurry is followed by multiple layers of pressure stacking, and the pressing pressure is 1 to 10 MPa.

In a third aspect, the present disclosure provides the use of the gasket according to the first aspect, which is used to seal a connection between rigid heterogeneous pipe fittings. The gasket provided by the present disclosure can be used in the connection of high temperature pipe fittings such as petrochemical industry, metallurgy, building materials, electricity, etc., and is particularly suitable for the contact sealing surface of ceramic film and steel plate, which can well buffer the expansion of the pipe fittings at high temperature Effect and good sealing effect.

Compared with the prior art, the present disclosure has the following beneficial effects:

(1) The present disclosure forms a binder slurry by mixing water-based polyurethane, epoxy resin emulsion, filler, aluminum sol, and dispersant, which effectively improves the mechanical strength of the gasket, while ensuring viscosity and environmental protection, at room temperature. High strength, no hardening, good flexibility at high temperature, no brittle fracture, can better meet the high temperature flexibility of the material;

(2) The present disclosure makes the material have high mechanical strength through multilayer composite of refractory fiber cloth. At the same time, the multilayer fiber can self-adjust the rigid point stress it receives under pressure and thermal stress, through gap compensation and excellent corrosion resistance And improve the sealing performance of the material;

(3) The addition of vermiculite particles in the present disclosure can effectively increase the temperature resistance of the material through the dispersion distribution, and expand the use temperature range of the gasket;

(4) The mullite short fibers and zirconia short fibers are added in the present disclosure, and are randomly dispersed in different directions between the fiber cloth layers to play a supporting role to improve the resilience of the material;

(5) The high-temperature-resistant, flexible and elastic gasket provided in this disclosure can be used for a long time in an environment of 700-1000 ° C, and has a flexible elasticity that is tightly combined with the sealing surface. The joints of rigid and heterogeneous pipe fittings play the role of flexible sealing and cushioning, have good integrity, do not stick to the surface of the pipe fittings, can be cleaned, and are easy to disassemble and replace;

(6) The high-temperature-resistant flexible elastic gaskets provided in the present disclosure have readily available raw materials, are environmentally friendly, have simple preparation processes, and are suitable for industrial applications.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic cross-sectional view (not limited to the number of superimposed layers) of the gasket prepared in Example 1 of the present disclosure, where 1-refractory fiber cloth, 2-binder slurry;

FIG. 2 is a schematic diagram of the overall structure of an O-ring seal prepared in Example 1 of the present disclosure.

Detailed ways

In order to better explain the present disclosure and facilitate understanding of the technical solutions of the present disclosure, the present disclosure is further described in detail below. However, the following embodiments are merely simple examples of the present disclosure, and do not represent or limit the scope of protection of the rights of the present disclosure. The scope of protection of the present disclosure is subject to the claims.

The following are typical but non-limiting examples of this disclosure:

Example 1

Prepare the gasket as follows:

In this embodiment, the components and ratio of the binder slurry of the gasket are selected as: 52 parts of water-based polyurethane, 30 parts of epoxy resin emulsion, 13 parts of filler, 5 parts of aluminum sol, and 0.8 part of dispersion Agent.

(1) Add water-based polyurethane, epoxy resin emulsion, aluminum sol, and dispersant to a high-speed mixer for 20 minutes, mix thoroughly, and then add 13 parts of filler. The composition of the filler is vermiculite particles and mullite short fibers added at a mass ratio of 1 _: 1. A stable binder slurry was formed after ball milling for 1 h. The dispersant is sodium dodecylbenzenesulfonate.

(2) Using plain weave high-silicone fiber cloth with a purity higher than 96% as the substrate, and after high-temperature pretreatment at 600 ° C for 30 minutes, the adhesive slurry is evenly coated on the upper and lower sides of the fiber cloth using an automatic tumbling machine to coat The amount is about 0.1g / cm ^2. After infrared drying at 70 ° C. for 1 hour, a large amount of water is lost, and then the layers are superimposed and compounded under a pressure of 10 MPa. Finally, through die cutting, an O-shaped high-temperature-resistant flexible elastic gasket with an inner diameter of 7 cm and an outer diameter of 9 cm is obtained.

The gasket prepared in this embodiment can be used for sealing high-temperature ceramic membrane filter tubes. It is installed between the porous steel plate and the ceramic filter tube. Under the pressing force of the top of the ceramic tube, the gasket is elastically deformed by compression, thereby filling the high temperature. The gap between the ceramic tube and the porous steel plate achieves an effective sealing effect.

The cross section of the gasket prepared in this embodiment is shown in FIG. 1 (not limited to the number of superimposed layers shown in this figure). The gasket is composed of a refractory fiber cloth 1 and a binder slurry 2. The refractory fiber cloth 1 is superimposed on each other. The binder slurry 2 is located between adjacent refractory fiber cloths 1 and the outer side of the outermost refractory fiber cloth 1.

A schematic diagram of the overall structure of the gasket prepared in this embodiment is shown in FIG. 2 and is an O-ring.

The test results show that the gasket prepared in this embodiment has the flexibility of tightly combining with the sealing surface, plays a role of flexible elastic sealing and buffering stress, and can be used for a long time in an environment of 700-1000 ° C. After a long-term temperature resistance test, it was found that it has a good sealing effect, high integrity and high strength at high temperatures, does not adhere to the surface of the pipe, can be quickly cleaned, and is easy to disassemble and replace. Ceramic membrane filter tubes that can be used for high temperature flue gas purification, such as steel plant flue gas purification and other industrial high temperature flue gas purification equipment.

The five-layer superimposed gasket prepared in this embodiment is used at 1000 ° C. for a long time, and the tensile strength is maintained at about 35.9 MPa.

Example 2

Follow these steps to prepare a heat-resistant, flexible and elastic gasket:

In this embodiment, the binder slurry component and the mixing ratio of the sealing material are selected as: 68 parts of water-based polyurethane, 16 parts of epoxy resin emulsion, 15 parts of filler, 1 part of aluminum sol, and 1 part of dispersant. .

(1) Add water-based polyurethane, epoxy resin emulsion, aluminum sol, and dispersant into a high-speed mixer and stir for 20 minutes. After mixing, add 15 parts of filler. The composition of the filler is vermiculite particles, mullite short fibers and zirconia short fibers added at a mass ratio of 2: 1: 1. After stirring, a stable binder slurry was formed. The stirring speed was controlled at 800 rpm and stirred for 50 minutes. The dispersant is sodium alkyl diphenyl ether monosulfonate.

(2) Using a satin high-silicone fiber cloth with a purity higher than 96% as a substrate, and after ultrasonic vibration of ethanol, drying and high-temperature pretreatment at 600 ° C, the adhesive slurry is evenly and evenly coated with a doctor blade. The upper and lower sides of the fiber cloth are coated with an amount of about 0.3 g / cm ^2. Multi-layer superposition is performed according to the same surface of the cloth texture, and dried at 50 ° C. for 10 hours under a pressure of 1 MPa. Finally, a high-temperature-resistant flexible elastic gasket is obtained by die cutting.

The cross section of the gasket prepared in this embodiment refers to Example 1 (the specific number of layers is not limited to the number of layers in Example 1). The gasket is composed of a refractory fiber cloth 1 and a binder slurry 2. Superposed, the binder slurry 2 is located between adjacent refractory fiber cloths 1 and the outer side of the outermost refractory fiber cloth 1.

The five-layer stacked gasket prepared in this embodiment is used continuously at 1000 ° C. for 20 hours, and the tensile strength is maintained at about 25.2 MPa, and the strength does not decrease.

Example 3

Follow these steps to prepare a heat-resistant, flexible and elastic gasket:

In this embodiment, the binder slurry components and mixing ratio of the high-temperature gasket are selected as follows: 65 parts of water-based polyurethane, 22 parts of epoxy resin emulsion, 10 parts of filler, 3 parts of aluminum sol, and 0.5 part of dispersion Agent.

(1) Add water-based polyurethane, epoxy resin emulsion, aluminum sol, and dispersant to a high-speed mixer for 50 minutes. After stirring, add 10 parts of filler. The composition of the filler is that vermiculite particles and mullite short fibers are added in a mass ratio of 2: 1. After mixing, a stable binder slurry is formed. The dispersant is sodium dodecylbenzenesulfonate.

(2) Using stainless steel wire-reinforced plain-grain aluminum silicate fiber cloth as a base material, the fiber cloth was immersed in the above slurry, and then three layers were stacked, and dried at 60 ° C. for 5 hours under a pressure of 2 MPa. Finally, a high-temperature-resistant flexible elastic gasket is obtained by die cutting.

The cross section of the gasket prepared in this embodiment refers to Example 1 (the specific number of layers is not limited to the number of layers in Example 1). The gasket is composed of a refractory fiber cloth 1 and a binder slurry 2. The refractory fiber cloth 1 is mutually Superposed, the binder slurry 2 is located between adjacent refractory fiber cloths 1 and the outer side of the outermost refractory fiber cloth 1.

The test results show that the gasket prepared in this embodiment has the flexibility of tightly combining with the sealing surface, plays a role of flexible elastic sealing and buffering stress, and can be used for a long time in an environment of 700 ° C. After a long-term temperature resistance test, it was found that it has a good sealing effect, high integrity and high strength at high temperatures, does not adhere to the surface of the pipe, can be quickly cleaned, and is easy to disassemble and replace. Ceramic membrane filter tubes that can be used for high temperature flue gas purification, such as steel plant flue gas purification and other industrial high temperature flue gas purification equipment.

The three-layer stacked gasket prepared in this embodiment is used at 700 ° C. for a long time, and the tensile strength is maintained at about 27.5 MPa.

Example 4

The specific steps of this embodiment refer to Example 1. The difference is that among the components of the binder slurry of the gasket, 50 parts by weight of the aqueous polyurethane and 35 parts by weight of the epoxy resin emulsion; In 2), the coating amount was about 0.01 g / cm ² .

The five-layer stacked gasket prepared in this embodiment is used at 900 ° C. for a long time, and the tensile strength is maintained at about 38.8 MPa.

Example 5

The specific steps of this embodiment refer to Example 1. The difference is that among the components of the binder slurry of the gasket, 70 parts by weight of the aqueous polyurethane and 10 parts by weight of the epoxy resin emulsion; steps ( In 2), the coating amount was about 0.5 g / cm ² .

The five-layer stacked gasket prepared in this embodiment is used at 1000 ° C. for a long time, and the tensile strength is maintained at about 34.3 MPa.

Comparative Example 1

The specific steps of this comparative example refer to Example 1, with the difference that no filler is added to the binder slurry.

The result of this comparative example is that the prepared gasket has a small viscosity due to the absence of fillers, a long drying time after multi-layer superposition, and the water dispersion loss rate at the edge of the material is likely to be significantly different from the water dispersion loss rate at the middle of the material. Lead to adverse consequences such as uneven shrinkage of the material and reduction in flatness.

Based on the above embodiments and comparative examples, it can be seen that the gasket provided by the present disclosure has the characteristics of high temperature resistance and strong flexibility. After multilayer composite, a three-dimensional sealing material with a controllable thickness and a plastic shape can be obtained, and the rigid heterogeneous pipe connection can be achieved. Flexible sealing effect. At the same time, it also has the characteristics of simple manufacturing process and low energy consumption, which can be used in the connection of high temperature pipe fittings such as petrochemical, metallurgy, building materials, and power. The comparative example did not adopt the scheme of the present disclosure, so the effects of the present disclosure could not be obtained.

The applicant states that the above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited to this. Those skilled in the art should understand that any person disclosed in this disclosure by those skilled in the art Within the technical scope, changes or replacements that can be easily conceived all fall within the scope of protection and disclosure of the present invention.

Claims

A gasket comprises a refractory fiber cloth (1) and a binder slurry (2), the refractory fiber cloth (1) is superimposed on each other, and the binder slurry (2) is located in an adjacent refractory fiber cloth ( 1) between and the outer side of the outermost layer of refractory fiber cloth (1);

The binder slurry (2) includes the following components in parts by weight:
The gasket according to claim 1, wherein in the gasket, the refractory fiber cloth (1) includes any one or at least two of high-silica fiber cloth, quartz fiber cloth, or aluminum silicate fiber cloth combination.
The gasket according to claim 1 or 2, wherein the weaving manner of the refractory fiber cloth (1) in the gasket comprises any one of plain weave, twill weave, or satin, or a combination of at least two of them.
The gasket according to any one of claims 1-3, wherein in the gasket, the binder slurry (2) includes the following components in parts by weight:

Preferably, in the gasket, the binder slurry (2) includes the following components in parts by weight:

Preferably, the filler comprises any one or a combination of at least two of vermiculite particles, mullite short fibers, or zirconia short fibers;

Preferably, the dispersant includes a dodecylbenzene sulfonate, an alkyl diphenyl ether monosulfonate, an alkyl diphenyl ether disulfonate, an alcohol ether sulfonate, or a phenol ether sulfonate. Any one or a combination of at least two.
The method for preparing a gasket according to any one of claims 1-4, comprising the following steps:

(1) preparing a binder slurry (2);

(2) The binder slurry (2) obtained in step (1) is compounded on the surface of the refractory fiber cloth (1) to be bonded, and the obtained refractory fiber cloth (1) compounded with the binder slurry (2) is further compounded. ) Superimposing, and finally processing and forming, to obtain the sealing gasket.
The method according to claim 5, wherein in step (1), the step of preparing the binder slurry (2) comprises the following steps:

A proportion of a water-based polyurethane, an epoxy resin emulsion, an aluminum sol, and a dispersant are mixed to obtain a mixed emulsion, and a proportion of a filler is added to the mixed emulsion to obtain the binder slurry (2) after dispersion. ).
The method according to claim 6, wherein the dispersant comprises dodecylbenzenesulfonate, alkyldiphenylether monosulfonate, alkyldiphenylether disulfonate, alcohol ethersulfonic acid Any one or a combination of at least two salts or phenol ether sulfonates;

Preferably, the method of mixing includes stirring;

Preferably, the filler comprises any one or a combination of at least two of vermiculite particles, mullite short fibers, or zirconia short fibers;

Preferably, the method of dispersion comprises any one or a combination of at least two of ultrasonic dispersion, stirring or ball milling.
The preparation method according to any one of claims 5 to 7, wherein the refractory fiber cloth (1) in step (2) comprises any one of a high-silica fiber cloth, a quartz fiber cloth, or an aluminum silicate fiber cloth Or a combination of at least two;

Preferably, in step (2), the method of compounding the binder slurry (2) obtained in step (1) on the surface of the refractory fiber cloth (1) to be bonded is coating or dipping;

Preferably, in the step (2), the amount of the binder slurry (2) compounded on the surface to be bonded of the refractory fiber cloth (1) is 0.01 to 0.5 g / cm 2 ;

Preferably, in step (2), the superimposing method is to laminate the refractory fiber cloth (1) compounded with the binder slurry (2) in multiple layers, and then pressurize and dry it, or compound the binder slurry ( 2) The single layer of refractory fiber cloth (1) is dried and then laminated under pressure;

Preferably, the pressing pressure is 1 to 10 MPa;

Preferably, in step (2), the method of processing and forming is die cutting.
The preparation method according to any one of claims 5 to 8, wherein in step (2), the refractory fiber cloth (1) is pretreated with a binder slurry (2) after being pretreated;

Preferably, the pretreatment is a desizing treatment;

Preferably, the method for the desizing treatment includes drying and / or heating at 600 ° C. after ultrasonic vibration in ethanol.
The preparation method according to any one of claims 5-9, wherein the method comprises the following steps:

(1) Mixing a proportion of a water-based polyurethane, an epoxy resin emulsion, an aluminum sol, and a dispersant to obtain a mixed emulsion, and adding a proportion of a filler to the mixed emulsion to obtain the binder after dispersion. Slurry (2);

(2) Combine the binder slurry (2) obtained in step (1) by coating or impregnating method on the surface of the desizing-resistant refractory fiber cloth (1) that needs to be bonded, and then combine the obtained composite Superimposing the refractory fiber cloth (1) of the agent slurry (2), and finally die cutting to obtain the sealing gasket;

The amount of the binder slurry (2) compounded on the surface to be bonded of the refractory fiber cloth (1) is 0.01 to 0.5 g / cm 2. The superimposing method is to compound the binder slurry (2). Layer of the refractory fiber cloth (1) is laminated and then pressed and dried, or the single layer of the refractory fiber cloth (1) combined with the binder slurry (2) is laminated and laminated and laminated under pressure. The pressure is 1 to 10 MPa.
The use of a gasket according to any one of claims 1-4, which is used to seal the connection between rigid heterogeneous pipe fittings.