CN106966684A - A kind of low-temperature expansion type pad and its manufacture method - Google Patents
A kind of low-temperature expansion type pad and its manufacture method Download PDFInfo
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- CN106966684A CN106966684A CN201710218796.1A CN201710218796A CN106966684A CN 106966684 A CN106966684 A CN 106966684A CN 201710218796 A CN201710218796 A CN 201710218796A CN 106966684 A CN106966684 A CN 106966684A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/001—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing unburned clay
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/0211—Arrangements for mounting filtering elements in housing, e.g. with means for compensating thermal expansion or vibration
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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
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/102—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by material
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Dispersion Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Fibers (AREA)
Abstract
A kind of method that the present invention padded and manufactured low-temperature expansion type pad about low-temperature expansion type.The present invention mixes thin diameter amorphous aluminosilicate fiber using thick diameter polycrystalline mullite fibre and mixed in certain proportion, using the organic bond being easily pyrolyzed, and reduces binder dosage, as little as less than 300 degrees Celsius of Initial Dilatation temperature drop for padding intumescent.The low-temperature expansion type pad of the present invention can be applied preferably on the relatively low Vehicular exhaust after-treatment system of operating temperature.
Description
Technical field
A kind of relevant intumescent pad of the present invention and its manufacture method, more particularly to a kind of low-temperature expansion type pad and its system
Make method.
Background technology
Chinese city air pollution faces unprecedented challenge, controls the tail gas pollution of vehicle to be reached to improving urban air-quality
Mark rate is significant.The method of control Vehicular exhaust pollutant emission can be divided into two kinds：One kind is that control pollutant is produced
Source --- combustion process, current this measure can not meet constantly strict discharge standard；Another is by installing additional
Exhaust gas aftertreatment system, passes through the method cleaning of off-gas pollutant of chemical reaction.
Vehicular exhaust after-treatment system can be divided into tail-gas from gasoline automobiles after-treatment system and exhaust gas from diesel vehicle after-treatment system, nothing
By its handle tail gas reaction mechanism how, its design include ceramic monolith (in particle trapper, Diesel
Be carborundum filter core or ceramic element in Particulate Filter, DPF), liner, the part of metal shell three.Sealing
Pad is main wherein to play fixed, sealing, heat-insulated, noise reduction function.
At present, intumescent pad is widely used to Vehicular exhaust after-treatment system, and it belongs to liner, typically by silicon
Sour aluminum fiber, expanding material and adhesive are constituted.Intumescent pad expanded by heating under operating mode, and then sufficient fixed force is provided
To fix ceramic monolith or filter core, prevent it from occurring play and sliding.Heat occurs after heated for the adhesive in intumescent pad
Solution, progressively burns and loses.The expansion character of intumescent pad is characterized by hot expansibility test, and initial expansion temperature is defined as
Pad expansion rate in thermal histories starts increased inflection temperature.The initial expansion temperature of conventional expanded type pad is general about
400 degrees Celsius.
In some designs, due to the reason, Vehicular exhaust post processing such as exhaust temperature is relatively low, the long heat loss of pipeline is excessive
The working temperature of system is relatively low, about 300-400 degrees Celsius, the initial expansion temperature padded less than conventional expanded type.Due to
Pad has good heat-insulating property, and the major part (part especially away from center ceramic carrier) of pad can not be obtained fully
Thermal excitation and cause expansion.Simultaneously, additionally it should be noted that, the organic bond in pad can not be sufficiently pyrolyzed, residual
The adhesive stayed equally limits the expansion of pad.In addition, the caused weight loss of organic bond pyrolysis in pad is on the contrary
The contraction of pad can be caused.The comprehensive function of this three, makes conventional expanded type pad after the relatively low Vehicular exhaust of working temperature
Sufficient fixed force can not be provided in processing system.In vehicle operation, ceramic monolith, the ceramics that cannot fully fix
Filter core, carborundum filter core easily slide, deviate from or damaged, and then cause Vehicular exhaust after-treatment system to fail, vehicle tail
Gas can not be fully purified, and discharge not up to standard.
Therefore, it is necessary to propose a kind of new low-temperature expansion type pad and its manufacture method so that the pad is less than tradition
It can be expanded under the initial expansion temperature of intumescent pad, while can provide fully without excessive expansive force.
The content of the invention
It is an object of the invention to provide a kind of low-temperature expansion type pad and its manufacture method.
According to an aspect of the present invention there is provided a kind of low-temperature expansion type pad, it includes：Thick diameter polycrystalline mullite is fine
Dimension, thin diameter amorphous aluminosilicate fiber, the organic bond being easily pyrolyzed, wherein, the thick diameter polycrystalline mullite fibre is with being somebody's turn to do
The percentage that the weight sum of thin diameter amorphous aluminosilicate fiber accounts for the pad overall weight is 30%~95%, the expanding material
The ratio for accounting for the pad overall weight is 2%~60%, and the weight of the organic bond being easily pyrolyzed accounts for the pad total weight
The percentage of amount is 1%~5%.
It is preferred that, the thick diameter polycrystalline mullite fibre is the polycrystalline mullite fibre of 8-10 microns of average diameter, and this is thin
Diameter amorphous aluminosilicate fiber is the amorphous aluminosilicate fiber of 2-5 microns of average diameter.
It is preferred that, the weight of the thick diameter polycrystalline mullite fibre accounts for the thick diameter polycrystalline mullite fibre and the thin diameter
The percentage of amorphous aluminosilicate fibre weight sum is no more than 50%.
It is preferred that, the organic bond being easily pyrolyzed is in the air that flow velocity is 30mL/ minutes, from 20 degrees Celsius,
When being heated with the heating rate of 10 degrees celsius/minutes, to the weight of loss at least 50% at 350 degrees Celsius.
It is preferred that, shot content as little as less than 5% in the thin diameter amorphous state alumina silicate fibre.
Another aspect of the present invention provides a kind of manufacture method of low-temperature expansion type pad, and its step includes
Step one, it is with slurry：By the polycrystalline mullite fibre of thick diameter, amorphous aluminosilicate fiber, the expanding material of thin diameter
It is added to the water, applies stirring, then add the organic bond being easily pyrolyzed, be configured to slurry.Wherein, the thick diameter mullite
The percentage that the weight sum of fiber and the thin diameter alumina silicate fibre accounts for the pad overall weight is 30%~95%, the expansion
The percentage that the weight of material accounts for the pad overall weight is 2%~60%, and the weight of the organic bond being easily pyrolyzed is accounted for
The percentage of the pad overall weight is 1%~5%.
Step 2: shaping：The slurry is injected into vacuum forming machine or single lead screw ex truding briquetting machine, a shaping wet embryo is obtained.
Step 3: drying：The shaping wet embryo continuous heating is dried, dried pad semi-finished product are obtained.
Step 4: shaping：The dried pad semi-finished product are processed into pad finished product according to thickness, shape.
It is preferred that, the thick diameter polycrystalline mullite fibre is the polycrystalline mullite fibre of 8-10 microns of average diameter, and this is thin
Diameter amorphous aluminosilicate fiber is the amorphous aluminosilicate fiber of 2-5 microns of average diameter.
It is preferred that, the weight of the thick diameter polycrystalline mullite fibre accounts for the thick diameter polycrystalline mullite fibre and the thin diameter
The percentage of amorphous aluminosilicate fibre weight sum is no more than 50%.
It is preferred that, the organic bond being easily pyrolyzed is in the air that flow velocity is 30mL/ minutes, from 20 degrees Celsius,
When being heated with the heating rate of 10 degrees celsius/minutes, to the weight of loss at least 50% at 350 degrees Celsius.
It is preferred that, shot content as little as less than 5% in the thin diameter amorphous state alumina silicate fibre.
Brief description of the drawings
By the way that one embodiment of the present invention is described with reference to accompanying drawing, the present invention may be better understood, attached
In figure：
Fig. 1 show the flow chart of the manufacture method of low-temperature expansion type pad of the present invention.
Fig. 2 show a kind of embodiment of low-temperature expansion type pad of the present invention and the thermal expansivity that conventional expanded type is padded is tried
Test comparative result figure.
Fig. 3 show the thermal expansivity that another embodiment of low-temperature expansion type pad of the present invention is padded with conventional expanded type
Comparison of test results figure.
Fig. 4 show the thermal expansivity that another embodiment of low-temperature expansion type pad of the present invention is padded with conventional expanded type
Comparison of test results figure.
Fig. 5 show the thermal expansivity that another embodiment of low-temperature expansion type pad of the present invention is padded with conventional expanded type
Comparison of test results figure.
Fig. 6 show the thermal expansivity that another embodiment of low-temperature expansion type pad of the present invention is padded with conventional expanded type
Comparison of test results figure.
Fig. 7 show shown in Fig. 6 low-temperature expansion type of the present invention pad embodiment and conventional expanded type pad it is hot
Axial thrust comparison of test results figure.
Embodiment
Unless otherwise defined, technical term or scientific terminology used herein should be in art of the present invention and had
The ordinary meaning that the personage of general technical ability is understood.Used in present patent application specification and claims " the
One " " the second " and similar word are not offered as any order, quantity or importance, and are used only to distinguish different groups
Into part.Equally, the similar word such as " one " or " one " does not indicate that quantity is limited yet, but represents there is at least one." bag
Include " or the similar word such as the "comprising" material or object that mean to appear in before " comprising " or "comprising" cover appearance
In the material or object of " comprising " or "comprising" presented hereinafter and its equivalent, it is not excluded that other materials or object.
Alumina silicate fibre can be divided into crystalline state alumina silicate fibre and amorphous state aluminium silicate fiber according to the arranging situation of interior atoms
Dimension, can be distinguished by X-ray diffraction spectra.Particle is in the row of being repeated cyclically in three dimensions inside crystalline state alumina silicate fibre
Row, the characteristics of with long-range order, it can be common that crystalline phase is the polycrystalline mullite fibre of mullite phase.Amorphous state alumina silicate fibre
Internal particle in three dimensions in being repeated cyclically arrangement, the characteristics of with short-range order, longrange disorder, also known as glassy state
Alumina silicate fibre or amorphous silicic acid aluminum fiber.
It is fine that low-temperature expansion type pad of the present invention includes thick diameter polycrystalline mullite fibre, thin diameter amorphous aluminosilicate
Dimension, expanding material, the organic bond being easily pyrolyzed, particularly, can also include inorganic bond, filler, auxiliary agent etc..
Wherein, the weight sum of the thick diameter polycrystalline mullite fibre and the thin diameter amorphous aluminosilicate fiber accounts for institute
The percentage for stating pad overall weight is 30%~95%, and the ratio that the expanding material accounts for the pad overall weight is 2%
~60%, it is 1%~5% that the weight of the organic bond being easily pyrolyzed, which accounts for the percentage for padding overall weight,.
Polycrystalline mullite fibre in the present invention refers to commercially available polycrystalline mullite fibre (SiO2+Al2O3>=96wt.%,
Al2O3>=72wt.%), the polycrystalline mullite fibre is generally prepared using sol-gal process, it would however also be possible to employ prepared by other method.
The polycrystalline mullite fibre of thick diameter has more excellent mechanical performance relative to the amorphous aluminosilicate fiber of thin diameter, with more preferable
Rebound performance.
Amorphous aluminosilicate fiber in the present invention includes commercially available high-purity amorphous state alumina silicate fibre (SiO2+Al2O3≥
96wt.%, 44wt.%≤Al2O3≤ 50wt.%) and high alumina amorphous state alumina silicate fibre (SiO2+Al2O3>=96wt.%,
50wt.%≤Al2O3≤ 55wt.%), also including the amorphous state alumina silicate fibre (SiO containing zirconium2+Al2O3+ZrO2>=99wt.%,
39wt.%≤Al2O3≤ 40wt.%, 15wt.%≤ZrO2≤ 17wt.%), generally prepared using blowing process with a method is got rid of,
It can be prepared using other method.Mullite fiber of the amorphous state alumina silicate fibre relative to thick diameter of thin diameter is in wet moulding
There is more excellent machinability in technique.
The characteristics of based on fibre manufacturing technique itself, even if cannot guarantee that all fibres are same with a batch of fiber
The diameter of sample, but form certain distribution.Measured in the present invention by electron microscope shooting fibre picture and count a certain
The average diameter of batch fiber is used as diacritical point.Inventor uses average diameter for 8-10 by test of many times and screening, discovery
The polycrystalline mullite fibre of micron is thoroughly mixed to form fibre with the amorphous aluminosilicate fiber of 2-5 microns of average diameter with certain proportion
Tie up after floc sedimentation, the mechanical performance of the pad manufactured more preferably, can just reach good mechanical swelling performance, simultaneously in low temperature
It is more prone to processing.
It is preferred that, in certain embodiments, the weight of thick diameter polycrystalline mullite fibre accounts for the thick diameter polycrystalline and not come
Mineral wool and the percentage of the thin diameter amorphous aluminosilicate fibre weight sum are 0%~50%, namely thin diameter non-crystalline silicon
Sour aluminum fiber weight accounts for remaining 50%~100%.Amorphous aluminosilicate fiber, except the ball that removes slag, contains slag ball by deslagging process
Amount is reduced to less than the 5% of overall weight.
Expanding material includes unexpanded vermiculite, expanded vermiculite, pretreatment vermiculite, expansible graphite or above-mentioned a kind of or many
Plant the combination of composition.The ratio that expanding material accounts for pad overall weight is 2%~60%.
Particularly, invention introduces the organic bond being easily pyrolyzed in the manufacturing process that low-temperature expansion type is padded.
Easily pyrolysis refers to when organic bond is in the air that flow velocity is 30mL/ minutes, from 20 degrees Celsius, with 10 degree mins Celsius
When the heating rate of clock is heated, to the weight of loss at least 50% at 350 degrees Celsius.Pad organic bond after heated is sent out
Raw burn is lost, and the aluminium silicate fiber peacekeeping expanding material fixed before releasing by organic bond allows both in smaller pact
Expanded under beam.In addition, the weight loss that the mistake of organic bond burning is brought in pad can cause organic viscous in the contraction of pad, pad
The amount of mixture is more, and pad tendencies toward shrinkage is bigger caused by organic bond burns and lost, and is ensureing the premise of pad mechanical strength
Under, should try one's best reduction organic agent content.The weight for the organic bond being easily pyrolyzed in the present invention accounts for pad overall weight
Ratio be 1%~5%.The organic bond of common easy pyrolysis includes the vinylacetate latex of low polymerization degree, Malaysia
The combination of anhydride esterifying cornstarch, acrylic latex, polyvinyl alcohol etc. and above-mentioned one or more compositions.
Inorganic bond includes sodium metasilicate, sodium bentonite, calcium-base bentonite, Ludox, Alumina gel, clay or above-mentioned one
The combination of kind or Multiple components, main function is to strengthen the adhesion between alumina silicate fibre, and the ratio for accounting for pad overall weight is
0%~2%.
Filler includes the combination of hollow glass micropearl, mica, perlite or above-mentioned one or more compositions, and main function is
The density of pad is adjusted, the ratio for accounting for pad overall weight is 0%~5%.
Additive includes the combination of surfactant, defoamer, flocculant, dispersant or above-mentioned one or more compositions,
Main function is to increase the operability of production process, and the ratio for accounting for pad overall weight is 0%~5%.
Fig. 1 shows the flow chart of the preparation method of the low-temperature expansion type pad.As shown in figure 1, step one, with slurry：
The amorphous aluminosilicate fiber of the polycrystalline mullite fibre of quantitative thick diameter, thin diameter is added to the water, dispersant is added, is made into
The mixture of certain fibre concentration, preferably 0.01~2% mixture applies high-speed stirred and the solid in slurry is divided
Dissipating makes it be evenly distributed, and disperses certain time, then adds defoamer, adhesive, flocculant, surfactant etc..Expand material
Material and filler can be added before together with thick diameter polycrystalline mullite fibre, thin diameter amorphous aluminosilicate fiber；Can also
It is individually added into again after slurry is formed.Wherein, the weight of the thick diameter mullite fiber and the thin diameter alumina silicate fibre
The percentage that sum accounts for the pad overall weight is 30%~95%, and the weight of the expanding material accounts for the pad total weight
The percentage of amount is 2%~60%, and the weight of the organic bond being easily pyrolyzed accounts for the percentage of the pad overall weight
Than for 1%~5%.
Inventor by test of many times with screening, find use average diameter for 8-10 microns polycrystalline mullite fibre and
The amorphous aluminosilicate fiber of 2-5 microns of average diameter is thoroughly mixed to form after fiber floc sedimentation with certain proportion, the lining manufactured
The mechanical performance of pad more preferably, can just reach good mechanical swelling performance in low temperature, while being more prone to processing.
It is preferred that, in certain embodiments, the weight of thick diameter polycrystalline mullite fibre accounts for the thick diameter polycrystalline and not come
Mineral wool and the percentage of the thin diameter amorphous aluminosilicate fibre weight sum are 0%~50%, namely thin diameter non-crystalline silicon
Sour aluminum fiber weight accounts for remaining 50%~100%.All amorphous aluminosilicate fibers, except the ball that removes slag, make by deslagging process
Shot content is reduced to less than the 5% of overall weight.
Step 2: shaping：The slurry prepared is injected into continuous vacuum forming apparatus or intermittent vacuum forming machine or extruding
Forming machine, makes it be deposited under 0.05~0.1MPa vacuum on mould or silk screen, obtains a shaping wet embryo.
Step 3: drying：The shaping wet embryo continuous heating is dried, dried pad semi-finished product are obtained.Drying side
Method is the combination of convective drying, microwave drying or both；When using only convective drying, the control of hot drying-air temperature 60~
120 DEG C, drying time is 1~12 hour；When using only microwave drying, microwave frequency is 0.5 in 2450 megahertzs of drying times
~2 hours；When convective drying and microwave drying are used in combination, the moisture in liner is removed first with convective drying, then
Pad centers are thermally dried using microwave drying emphasis, remaining moisture is removed.
Step 4: shaping：By dried liner semi-finished product further, according to the processing drawing of actual requirement, make
With pressure roller pressurization regulation thickness, finished product is made using laser cutting, stamping processing mode.
In order to better illustrate the present invention, padded respectively for the low-temperature expansion type manufactured in multiple embodiments of the present invention
Pad, tested using the conventional method of testing of industry with conventional intumescent, be i.e. hot expansibility experiment is tried with hot axial thrust
Test.
Hot expansibility refers to sample under 50psi (pound per square inch is approximately equal to 345kPa) load, in certain temperature
The variation characteristic of liner thickness in cyclic process.Sampling, after being compressed 30 minutes under normal temperature (20 degrees Celsius), 50psi load, note
Its thickness is recorded, original thickness is used as.Under 50psi load, it is warming up to 10-15 degrees celsius/minutes after 750 degrees Celsius, constant temperature
10 minutes, room temperature then is cooled to by 25 degrees celsius/minute speed, a Thermal Cycling is completed, moment records during this
Liner thickness.Wherein pad expansion rate is defined as the ratio of pad actual measurement thickness and original thickness in process of the test.Pad exists
Expansion rate starts the initial expansion temperature that increased inflection temperature is defined as pad in thermal histories.
Hot axial thrust experiment refers to, pad encapsulation to be tested is total to the tail-gas after treatment apparatus of correspondence model
Into.Tail-gas after treatment apparatus assembly after encapsulation is heated to test temperature, mode of heating can be electrical heating, can also be placed in
Heated in the devices such as baking oven.Under test temperature, uniformly applied by diameter 30mm push rod on carrier end face center
Plus the thrust constantly increased.It is corresponding hot under thrust when record carrier is subjected to displacement with respect to housing, the as test temperature
Axial thrust.
Embodiment 1
Purchase after fiber, respectively to certain a batch of polycrystalline mullite fibre and another a batch of amorphous aluminosilicate fiber
Each sampling 5g, takes pictures, each fiber can be clearly apparent under an electron microscope, computer aided calculation can under an electron microscope
Obtain the average diameter of the fiber of the batch.For the fiber of two batches in the present embodiment, polycrystalline mullite fibre is averaged
A diameter of 8.01 microns, the average diameter of amorphous aluminosilicate fiber is 2.06 microns, the shot content of amorphous aluminosilicate fiber
For 3.6%.
In this implementation, average diameter is 8.01 microns of polycrystalline mullite fibre and the non-crystalline silicon of 2.06 microns of average diameter
The percentage that the weight sum of sour aluminum fiber accounts for pad overall weight is 65%, and average diameter is 8.01 microns of polycrystalline mullite
Fiber accounts for the 25% of fiber overall weight, is left the 75% amorphous aluminosilicate fiber for being 2.06 microns of average diameter.Expanding material
Using pretreatment vermiculite, the weight of expanding material accounts for the 30% of pad overall weight, the organic of the easy pyrolysis of addition 4%
Agent, and the sodium metasilicate of 1% weight are used as inorganic bond.
Organic bond uses polyvinyl alcohol in the present embodiment, and the polyvinyl alcohol of certain model is 30mL/ minutes in flow velocity
Air in, from 20 degrees Celsius, with the heating rate of 10 degrees celsius/minutes be heated when, at 300 degrees Celsius loss can
55% weight.According to the manufacture method manufacture shown in Fig. 1, a standard-sized low-temperature expansion type pad is obtained.In order to verify
The performance of the present invention, is made using a traditional intumescent pad (buying certainly external certain pad company, model Interam 100)
For comparative example, hot expansibility experiment is carried out with low-temperature expansion type of the present invention pad.
Hot expansibility experiment is as shown in Figure 2, it is evident that low-temperature expansion type pad initial expansion temperature of the invention is about
237 degrees Celsius, about 380 degrees Celsius of the initial expansion temperature of comparative example conventional expanded type pad.Illustrate the low temperature in the present embodiment
Intumescent pad can reach the effect of low-temperature expansion.
Embodiment 2
The fiber of two batches in the present embodiment, the average diameter of polycrystalline mullite fibre is 9.89 microns, amorphous silicic acid
The average diameter of aluminum fiber is 4.93 microns, and the shot content of amorphous aluminosilicate fiber is 4.3%.
In this implementation, average diameter is 9.89 microns of polycrystalline mullite fibre and the non-crystalline silicon of 4.93 microns of average diameter
The percentage that the weight sum of sour aluminum fiber accounts for pad overall weight is 65%, and average diameter is 9.89 microns of polycrystalline mullite
Fiber accounts for the 1% of fiber overall weight, is left the 99% amorphous aluminosilicate fiber for being 4.93 microns of average diameter.Expanding material is adopted
With the combination of unexpanded vermiculite and pretreatment vermiculite, the weight of expanding material accounts for the 30% of pad overall weight, the appearance of addition 4%
The organic bond being easily pyrolyzed, remaining 1% weight is inorganic bond sodium metasilicate and filler hollow glass micropearl.
Organic bond uses acrylic latex in the present embodiment, and the acrylic latex of certain model is 30mL/ in flow velocity
In the air of minute, from 20 degrees Celsius, when being heated with the heating rate of 10 degrees celsius/minutes, lost during to 300 degrees Celsius
Can 57% weight.According to the manufacture method manufacture shown in Fig. 1, a standard-sized low-temperature expansion type pad is obtained.Equally
, using a traditional intumescent pad (certain pads company, model Interam 100 from foreign countries for buying) as a comparison case,
Hot expansibility experiment is carried out with low-temperature expansion type of the present invention pad.
Hot expansibility experiment is as shown in Figure 3, it is evident that low-temperature expansion type pad initial expansion temperature of the invention is about
258 degrees Celsius, about 380 degrees Celsius of the initial expansion temperature of comparative example conventional expanded type pad.Illustrate the low temperature in the present embodiment
Intumescent pad can reach the effect of low-temperature expansion.
Embodiment 3
The fiber of two batches in the present embodiment, the average diameter of polycrystalline mullite fibre is 8.87 microns, amorphous silicic acid
The average diameter of aluminum fiber is 3.02 microns, and the shot content of amorphous aluminosilicate fiber is 2.7%.
In this implementation, average diameter is 8.87 microns of polycrystalline mullite fibre and the non-crystalline silicon of 3.02 microns of average diameter
The percentage that the weight sum of sour aluminum fiber accounts for pad overall weight is 65%, and average diameter is 8.87 microns of polycrystalline mullite
Fiber accounts for the 50% of fiber overall weight, is left the 50% amorphous aluminosilicate fiber for being 3.02 microns of average diameter.Expanding material
Using the combination of expanded vermiculite and pretreatment vermiculite, the weight of expanding material accounts for the 30% of pad overall weight, addition 4%
The organic bond being easily pyrolyzed, remaining 1% weight is inorganic bond calcium-base bentonite.
Organic bond uses polyvinyl alcohol in the present embodiment, and the polyvinyl alcohol of certain model is 30mL/ minutes in flow velocity
Air in, from 20 degrees Celsius, with the heating rate of 10 degrees celsius/minutes be heated when, at 300 degrees Celsius loss can
55% weight.According to the manufacture method manufacture shown in Fig. 1, a standard-sized low-temperature expansion type pad is obtained.Likewise, adopting
(certain pads company, model Interam 100 from foreign countries for buying) is padded with a traditional intumescent as a comparison case, with this hair
Bright low-temperature expansion type pad carries out hot expansibility experiment.
Hot expansibility experiment is as shown in Figure 4, it is evident that low-temperature expansion type pad initial expansion temperature of the invention is about
232 degrees Celsius, about 380 degrees Celsius of the initial expansion temperature of comparative example conventional expanded type pad.Illustrate the low temperature in the present embodiment
Intumescent pad can reach the effect of low-temperature expansion.
Embodiment 4
The fiber of two batches in the present embodiment, the average diameter of polycrystalline mullite fibre is 9.65 microns, amorphous silicic acid
The average diameter of aluminum fiber is 4.69 microns, and the shot content of amorphous aluminosilicate fiber is 3.5%.
In this implementation, average diameter is 9.65 microns of polycrystalline mullite fibre and the non-crystalline silicon of 4.69 microns of average diameter
The percentage that the weight sum of sour aluminum fiber accounts for pad overall weight is 95%, and average diameter is 9.65 microns of polycrystalline mullite
Fiber accounts for the 25% of fiber overall weight, is left the 75% amorphous aluminosilicate fiber for being 4.69 microns of average diameter.Expanding material
Using expansible graphite, the weight of expanding material accounts for the 2% of pad overall weight, the organic of the easy pyrolysis of addition 1%
Agent, remaining 2% weight is inorganic bond sodium metasilicate and filler hollow glass micropearl.
Organic bond uses the vinylacetate latex of low polymerization degree, the low polymerization degree vinegar of certain model in the present embodiment
Vinyl acetate latex is in the air that flow velocity is 30mL/ minutes, from 20 degrees Celsius, with the heating rate of 10 degrees celsius/minutes
Be heated when, at 300 degrees Celsius loss can 51% weight.According to the manufacture method manufacture shown in Fig. 1, a standard is obtained
The low-temperature expansion type pad of size.Likewise, using a traditional intumescent pad, (from foreign countries, certain pads company, model for buying
For Interam 100) as a comparison case, carry out hot expansibility experiment with low-temperature expansion type of the present invention pad.
Hot expansibility experiment is as shown in Figure 5, it is evident that low-temperature expansion type pad initial expansion temperature of the invention is about
271 degrees Celsius, about 380 degrees Celsius of the initial expansion temperature of comparative example conventional expanded type pad.Illustrate the low temperature in the present embodiment
Intumescent pad can reach the effect of low-temperature expansion.
Embodiment 5
The fiber of two batches in the present embodiment, the average diameter of polycrystalline mullite fibre is 9.03 microns, amorphous silicic acid
The average diameter of aluminum fiber is 4.11 microns, and the shot content of amorphous aluminosilicate fiber is 3.2%.
In this implementation, average diameter is 9.03 microns of polycrystalline mullite fibre and the non-crystalline silicon of 4.11 microns of average diameter
The percentage that the weight sum of sour aluminum fiber accounts for pad overall weight is 30%, and average diameter is 9.03 microns of polycrystalline mullite
Fiber accounts for the 25% of fiber overall weight, is left the 75% amorphous aluminosilicate fiber for being 4.11 microns of average diameter.Expanding material
Using unexpanded vermiculite, the weight of expanding material accounts for the 60% of pad overall weight, the organic of the easy pyrolysis of addition 5%
Agent, remaining 5% weight is inorganic bond sodium metasilicate and filler mica.
Organic bond uses polyvinyl alcohol in the present embodiment, and the polyvinyl alcohol of certain model is 30mL/ minutes in flow velocity
Air in, from 20 degrees Celsius, with the heating rate of 10 degrees celsius/minutes be heated when, at 300 degrees Celsius loss can
55% weight.According to the manufacture method manufacture shown in Fig. 1, a standard-sized low-temperature expansion type pad is obtained.Likewise, adopting
(certain pads company, model Interam 100 from foreign countries for buying) is padded with a traditional intumescent as a comparison case, with this hair
Bright low-temperature expansion type pad carries out hot expansibility experiment.
Hot expansibility experiment is as shown in Figure 5, it is evident that low-temperature expansion type pad initial expansion temperature of the invention is about
242 degrees Celsius, about 380 degrees Celsius of the initial expansion temperature of comparative example conventional expanded type pad.Illustrate the low temperature in the present embodiment
Intumescent pad can reach the effect of low-temperature expansion.
Hot axial thrust experiment is carried out to the present embodiment and the pad of comparative example respectively, as a result as shown in fig. 7, can see
Go out, low-temperature expansion type of the invention is padded under 50~400 degrees Celsius of test temperature, possess relative to conventional expanded type pad
Higher hot axial thrust.
In summary, low-temperature expansion type of the invention pad can reach that the hot axial direction of increase exhaust gas aftertreatment system is pushed away
Power, reduction ceramic monolith comes off the purpose of risk.
Although with reference to specific embodiment, the present invention is described, it will be appreciated by those skilled in the art that
Can be so that many modifications may be made and modification to the present invention.It is therefore contemplated that, being intended to of claims is covered in the present invention
All such modifications and modification in true spirit and scope.
Claims (10)
1. a kind of low-temperature expansion type pad, it includes：It is thick diameter polycrystalline mullite fibre, thin diameter amorphous aluminosilicate fiber, swollen
Swollen material, the organic bond being easily pyrolyzed, wherein, the thick diameter polycrystalline mullite fibre and the thin diameter amorphous silicic acid
The percentage that the weight sum of aluminum fiber accounts for the pad overall weight is 30%~95%, and the expanding material accounts for the pad
The ratio of overall weight is 2%~60%, and the weight of the organic bond being easily pyrolyzed accounts for the pad overall weight
Percentage is 1%~5%.
2. low-temperature expansion type pad as claimed in claim 1, it is characterised in that the thick diameter polycrystalline mullite fibre is flat
The polycrystalline mullite fibre of equal 8-10 microns of diameter, the thin diameter amorphous aluminosilicate fiber is non-for 2-5 microns of average diameter
Brilliant alumina silicate fibre.
3. low-temperature expansion type pad as claimed in claim 2, it is characterised in that the weight of the thick diameter polycrystalline mullite fibre
It is not surpass that amount, which accounts for the thick diameter polycrystalline mullite fibre and the percentage of the thin diameter amorphous aluminosilicate fibre weight sum,
Cross 50%.
4. low-temperature expansion type pad as claimed in claim 3, it is characterised in that the organic bond being easily pyrolyzed is in stream
In the fast air for 30mL/ minutes, from 20 degrees Celsius, when being heated with the heating rate of 10 degrees celsius/minutes, taken the photograph to 350
The weight of loss at least 50% when family name spends.
5. the low-temperature expansion type pad as described in any claim of Claims 1-4, it is characterised in that the thin diameter is non-
Shot content as little as less than 5% in crystalline state alumina silicate fibre.
6. a kind of manufacture method of low-temperature expansion type pad, its step includes
Step one, it is with slurry：The polycrystalline mullite fibre of thick diameter, the amorphous aluminosilicate fiber of thin diameter, expanding material are added
In water, apply stirring, then add the organic bond being easily pyrolyzed, be configured to slurry.Wherein, the thick diameter mullite is fine
The percentage that dimension and the weight sum of the thin diameter alumina silicate fibre account for the pad overall weight is 30%~95%, described
The ratio that expanding material accounts for the pad overall weight is 2%~60%, and the weight of the organic bond being easily pyrolyzed is accounted for
The percentage of the pad overall weight is 1%~5%.
Step 2: shaping：The slurry is injected into vacuum forming machine or single lead screw ex truding briquetting machine, a shaping wet embryo is obtained.
Step 3: drying：The shaping wet embryo continuous heating is dried, dried pad semi-finished product are obtained.
Step 4: shaping：The dried pad semi-finished product are processed into pad finished product according to thickness, shape need.
7. the manufacture method of low-temperature expansion type pad as claimed in claim 6, it is characterised in that the thick diameter polycrystalline does not come
Mineral wool is the polycrystalline mullite fibre of 8-10 microns of average diameter, and the thin diameter amorphous aluminosilicate fiber is average diameter 2-
5 microns of amorphous aluminosilicate fiber.
8. the manufacture method of low-temperature expansion type pad as claimed in claim 7, it is characterised in that the thick diameter polycrystalline does not come
The weight of mineral wool accounts for the hundred of the thick diameter polycrystalline mullite fibre and the thin diameter amorphous aluminosilicate fibre weight sum
Divide than being no more than 50%.
9. the manufacture method of low-temperature expansion type as claimed in claim 8 pad, it is characterised in that it is described be easily pyrolyzed it is organic
Adhesive is in the air that flow velocity is 30mL/ minutes, from 20 degrees Celsius, is heated with the heating rate of 10 degrees celsius/minutes
When, to the weight of loss at least 50% at 350 degrees Celsius.
10. the manufacture method of the low-temperature expansion type pad as described in any claim of claim 6 to 9, it is characterised in that institute
State shot content as little as less than 5% in thin diameter amorphous state alumina silicate fibre.
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| CN108911793A (en) * | 2018-08-23 | 2018-11-30 | 河南省西峡开元冶金材料有限公司 | A kind of modified alumina silicate refractory ceramic fibre and preparation method thereof and a kind of motor-vehicle tail-gas purifying device sealing gasket |
| CN109665751A (en) * | 2018-12-28 | 2019-04-23 | 江苏腾利特种纤维科技有限公司 | The preparation method of ceramic fiber mat |
| CN109879636A (en) * | 2018-10-17 | 2019-06-14 | 江苏腾利特种纤维科技有限公司 | A kind of production method of intumescent heat insulation support liner |
| CN112661527A (en) * | 2020-12-18 | 2021-04-16 | 山东鲁阳浩特高技术纤维有限公司 | Expandable alumina-based fiber module and preparation method thereof |
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| CN105398106A (en) * | 2015-11-25 | 2016-03-16 | 青岛金智高新技术有限公司 | Multi-layered mat and waste gas treatment device |
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| JP2008007342A (en) * | 2006-06-27 | 2008-01-17 | Toshiba Corp | Anisotropic porous ceramic material and method of manufacturing the same |
| CN105398106A (en) * | 2015-11-25 | 2016-03-16 | 青岛金智高新技术有限公司 | Multi-layered mat and waste gas treatment device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108911793A (en) * | 2018-08-23 | 2018-11-30 | 河南省西峡开元冶金材料有限公司 | A kind of modified alumina silicate refractory ceramic fibre and preparation method thereof and a kind of motor-vehicle tail-gas purifying device sealing gasket |
| CN109879636A (en) * | 2018-10-17 | 2019-06-14 | 江苏腾利特种纤维科技有限公司 | A kind of production method of intumescent heat insulation support liner |
| CN109665751A (en) * | 2018-12-28 | 2019-04-23 | 江苏腾利特种纤维科技有限公司 | The preparation method of ceramic fiber mat |
| CN112661527A (en) * | 2020-12-18 | 2021-04-16 | 山东鲁阳浩特高技术纤维有限公司 | Expandable alumina-based fiber module and preparation method thereof |
| CN112661527B (en) * | 2020-12-18 | 2022-09-30 | 山东鲁阳浩特高技术纤维有限公司 | Expandable alumina-based fiber module and preparation method thereof |
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| CN106966684B (en) | 2019-11-22 |
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