CN109305796A - A kind of gasoline engine exhaust aftertreatment honeycomb ceramic filter body and preparation method thereof - Google Patents
A kind of gasoline engine exhaust aftertreatment honeycomb ceramic filter body and preparation method thereof Download PDFInfo
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- CN109305796A CN109305796A CN201811184674.6A CN201811184674A CN109305796A CN 109305796 A CN109305796 A CN 109305796A CN 201811184674 A CN201811184674 A CN 201811184674A CN 109305796 A CN109305796 A CN 109305796A
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- gasoline engine
- engine exhaust
- exhaust aftertreatment
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- C04B33/02—Preparing or treating the raw materials individually or as batches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/30—Particle separators, e.g. dust precipitators, using loose filtering material
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0006—Honeycomb structures
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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
- F01N3/022—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 characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—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 characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
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Abstract
The invention belongs to Extruded Monolithic Celluar Ceramics technical fields, and in particular to a kind of gasoline engine exhaust aftertreatment honeycomb ceramic filter body, and preparation method is further disclosed.Gasoline engine exhaust aftertreatment of the present invention ceramic honey comb GPF filtering body, with talcum, raw kaolin, aluminium oxide, hydrated alumina, silica is basic major ingredient, and add graphene presoma, starch, shell powder, fluoropolymer resin, binder, lubricating oil and brominated flame retardant are as additive, organic matter in GPF sintering procedure can be effectively inhibited to decompose oxidation heat liberation rate, control filtering body radial symmetry gradient, it improves and fires qualification rate, simultaneously, the inhibiting effect of fire retardant can promote filtering body firing kiln furnace temperature rise rate, shorten the firing time, reduce energy consumption, improve production efficiency.
Description
Technical field
The invention belongs to Extruded Monolithic Celluar Ceramics technical fields, and in particular to a kind of gasoline engine exhaust aftertreatment is made pottery with honeycomb
Porcelain filtering body, and preparation method is further disclosed.
Background technique
The advantages that direct spray petrol engine in cylinder (GDI) is because of preferable dynamic property, fuel economy, is cured on passenger car
It is widely applied to be cured.It is expected that the engine quantity of GDI will gradually surmount PFI engine in the year two thousand twenty.But due to GDI gasoline
The fuel oil direct cylinder injection of machine causes air-fuel mixture unevenly and the wet wall of fuel oil keeps granular material discharged quality and quantity significant
Increase.More and more harsh laws and regulations requirement directly jetting gasoline engine all keeps stablizing in the operating condition of wider range and lower PM is arranged
It puts.
Chinese six stage light-duty vehicle pollutant emission standards are to the particulate matter PM mass emission limit value of gasoline car
4.5mg/km is 6.0 × 10 to particulate matter quantity discharge amount limit value11A/km, for direct spray petrol engine in cylinder GDI, such as
Meet emission regulation demands, it is necessary to which gasoline engine ceramic honey comb grain catcher GPF is installed.
Gasoline engine grain catcher (Gasoline Particulate Filter, GPF) is that one kind is mounted on gasoline hair
Ceramic filter in motivation exhaust system, it can be captured before Particulate Emission substance enters atmosphere.GPF filtering
The DPF of mechanism and diesel engine is essentially identical, and with certain flow velocity by porous wall surface, this process is known as " wall for exhaust
Stream " (Wall-Flow).Wall flow type particle trap is made of the ceramic honeycomb with certain hole density, by alternately blocking
Cellular porous ceramic filtering body, exhaust stream are forced to pass through from duct wall surface, particulate matter respectively by diffusion, intercept, gravity and
4 kinds of modes of inertia are captured filtering.
The ingredient of ceramic honey comb GPF manufacturing process is on the basis of basic raw material (kaolin, talcum, aluminium oxide etc.)
On generally require addition binder (such as cellulose ether), dispersing agent (such as alcohol ether type organic) and lubricant (such as oils) add
Add agent, to obtain ideal microcellular structure, it is also necessary to add pore creating material (such as organic micro-spheres starch, graphite or shell class), cause
Content of organics in ceramic honey comb GPF raw material system is set to be up to 30% or more.It is internal in ceramic honey comb GPF sintering procedure
The tartan effect that thousands of cavitys are formed affects organic matter and decomposes the conduction that oxidation generates heat, causes filtering body along diameter
To from center to external margin formation temperature gradient, if temperature gradient is excessive, the excessively high thermal stress that inside generates easily is made
It cracks at GPF, is formed and fire waste product.Yield rate is fired to improve, it is necessary to which organic matter volatilizees in strict control GPF sintering procedure
The temperature rise rate (generally below 5 DEG C/h) of section, causes this section of used time longer (generally more than 90h)；Moreover, even if strict control
The firing qualification rate of temperature rise, GPF is also extremely difficult to 90%.Therefore, (temperature rise rate is no lower than 5 DEG C/h) for traditional GPF sintering procedure
Only production efficiency is low, and the too long firing time causes energy waste and fires being difficult to control for rejection rate, this also becomes
The bottleneck for limiting the development of GPF production line, seriously restricts the reduction of GPF manufacturing cost.It is, thus, sought for a kind of effectively mention
High ceramic honey comb GPF fires yield rate, reduces energy consumption, the method for improving production efficiency.
Summary of the invention
For this purpose, technical problem to be solved by the present invention lies in provide a kind of gasoline engine exhaust aftertreatment ceramic honey comb
Filtering body, and preparation method is further disclosed, finished product is fired to solve gasoline engine honeycomb ceramic filter body in the prior art
The problem that rate is low and production efficiency is lower.
In order to solve the above technical problems, a kind of gasoline engine exhaust aftertreatment honeycomb ceramic filter body of the present invention,
The raw material for preparing of the honeycomb ceramic filter body includes basic major ingredient and additive；
The basis major ingredient is in terms of its total amount, the component including following mass content:
Talcum 35-45wt%；
Raw kaolin 4-8wt%；
Aluminium oxide 10-15wt%；
Hydrated alumina 20-25wt%；
Silica 1 5-20wt%；
The additive includes the brominated flame retardant for accounting for the basic major ingredient total amount 3-7wt%.
Preferably, the additive amount of the brominated flame retardant accounts for the 5wt% of the basic major ingredient total amount.
Preferably, the gasoline engine exhaust aftertreatment honeycomb ceramic filter body, the basis major ingredient is with its total amount
Meter, the component including following mass content:
Talcum 40.30wt%；
Raw kaolin 6wt%；
Aluminium oxide 12.70wt%；
Hydrated alumina 23wt%；
Silica 1 8wt%.
The gasoline engine exhaust aftertreatment honeycomb ceramic filter body, it is described to add in terms of the total amount of the basic major ingredient
Adding agent further includes the component of following mass content:
Graphene presoma 5-10wt%；
Starch 5-10wt%；
Fruit stone powder 20-30wt%；
Fluoropolymer resin 5-15wt%；
Binder 5-10wt%；
Lubricating oil 1-2wt%.
The gasoline engine exhaust aftertreatment honeycomb ceramic filter body, it is described to add in terms of the total amount of the basic major ingredient
Adding agent further includes the component of following mass content:
Graphene presoma 7wt%；
Starch 8wt%；
Fruit stone powder 25wt%；
Fluoropolymer resin 10wt%；
Binder 7.5wt%；
Lubricating oil 1.5wt%.
The brominated flame retardant includes brominated Polystyrene and/or brominated epoxy resin；
The fluoropolymer resin includes polystyrene, polyacrylic resin, polymethyl methacrylate；
The binder includes methylcellulose, hydroxypropyl methyl cellulose, poly-vinyl alcohol solution, starch ether；
The lubricating oil includes base oil, technical white oil, vegetable oil；
The partial size of the fruit stone powder is 20-40 μm.
The invention also discloses a kind of method for preparing the gasoline engine exhaust aftertreatment honeycomb ceramic filter body,
Include the following steps:
(1) a selected amount of talcum, raw kaolin, aluminium oxide, hydrated alumina, silica, graphene forerunner are taken
Body, starch, fruit stone powder, fluoropolymer resin, binder and brominated flame retardant, progress vacuum is dry-mixed, and mixed powder is made；
(2) gained mixed powder is added into water and the lubricating oil, and carries out kneading processing；Then the pug of kneading is practiced
Plasticity mud section is made, and carries out aging processing；
(3) GPF honeycomb structure is made in mud section obtained extrusion, and carries out drying and processing, green body is made；
(4) after the green body after drying being cut to desired height, carry out ceramic honey comb firing, and through punching, plug-hole, enclose
Side processing, finished product.
In the step (4), the temperature controlled processes of the ceramic honey comb the firing step include:
150 DEG C are risen to by room temperature in 60-120min, controlling reaction temperature；
600 DEG C are risen to by 150 DEG C in 630-690min, controlling reaction temperature；
1000 DEG C are risen to by 600 DEG C in 420-480min, controlling reaction temperature；
1100 DEG C are risen to by 1000 DEG C in 180-240min, controlling reaction temperature；
1200 DEG C are risen to by 1100 DEG C in 40-90min, controlling reaction temperature；
1415 DEG C are risen to by 1200 DEG C in 660-780min, controlling reaction temperature；
Then in 1415 DEG C insulation reaction 8-11 hours.
In the step (2):
The additive amount of the water accounts for the 25-35wt% of the mixed powder doses；
The temperature of the aging step is 25 ± 3 DEG C, relative humidity 65 ± 5%.
In the step (3), the GPF honeycomb structure having a size of Ф (93-143.8) × (101.6-481mm),
The hole 200-300/square inch, wall thickness 8-10mil.
Gasoline engine exhaust aftertreatment of the present invention ceramic honey comb GPF filtering body, with talcum, raw kaolin, oxidation
Aluminium, hydrated alumina, silica are basic major ingredient, and add graphene presoma, starch, shell powder, fluoropolymer resin,
Binder, lubricating oil and brominated flame retardant are as additive, especially selection brominated Polystyrene and/or brominated epoxy resin
Class brominated flame retardant can effectively inhibit organic matter in GPF sintering procedure to decompose oxidation heat liberation rate, and control filtering body is radial
Temperature gradient, so that heating rate can be greatly speeded up in organic matter catabolic phase, even if being increased to 40 DEG C/h by 5 DEG C/h,
Product sintering qualified rate can still reach 93% or more, effectively increase the firing qualification rate of product, meanwhile, fire retardant
Inhibiting effect can promote filtering body firing kiln furnace temperature rise rate, shorten the firing time, reduce energy consumption, improve production efficiency.
The preparation method of gasoline engine exhaust aftertreatment ceramic honey comb GPF filtering body of the present invention, according to " mixing-is pinched
Conjunction-pugging-sieving-is aging-molding-sizing-drying-cutting-firing-edging-surrounding edge-plug-hole-flashes back " technical process system
Ceramic honey comb GPF is made, and is controlled by the gradient to temperature in sintering procedure, the yield rate that ceramic honey comb is made is close
100%, and the time of entire sintering procedure is substantially reduced, effectively increase production efficiency.
Detailed description of the invention
In order to make the content of the present invention more clearly understood, it below according to specific embodiments of the present invention and ties
Attached drawing is closed, the present invention is described in further detail, wherein
Fig. 1 is the temperature control curve figure of the firing step in 1-3 of the embodiment of the present invention；
Fig. 2 is the temperature control curve figure of the firing step in comparative example 1 of the present invention.
Specific embodiment
Embodiment 1
Gasoline engine exhaust aftertreatment honeycomb ceramic filter body described in the present embodiment, preparing raw material includes that basis is main
Material and additive；
The basis major ingredient is in terms of its total amount, the component including following mass content:
Talcum 40.30wt%；
Raw kaolin 6wt%；
Aluminium oxide 12.70wt%；
Hydrated alumina 23wt%；
Silica 1 8wt%.
In terms of the total amount of the basic major ingredient, the additive includes the component of following mass content ratio:
Graphene presoma 7wt%；
Starch 8wt%；
Shell powder 25wt%；
Fluoropolymer resin (polymethyl methacrylate) 10wt%；
Binder (hydroxypropyl methyl cellulose) 5wt%；
Lubricating oil (technical white oil) 1.5wt%；
Brominated Polystyrene fire retardant 5.0wt%.
Gasoline engine exhaust aftertreatment honeycomb ceramic filter body described in the present embodiment, preparation method include following step
It is rapid:
(1) in Vacuum mixer, 40.30kg talcum is sequentially added, the raw kaolin of 6.0kg, 12.70kg aluminium oxide,
23.0kg hydrated alumina, 18.0kg silica, 7.0kg graphene presoma, 8.0kg starch, 25.0kg fruit stone powder,
10.0kg fluoropolymer resin, 7.5kg binder, 5.0kg brominated Polystyrene fire retardant, unlatching batch mixer progress vacuum is dry-mixed,
Closelypacked homogeneous mixture, as mixed powder is made；
(2) gained mixed powder is placed in kneader, the water that 47.2kg is added is mediated 7 minutes, later, 1.5kg is added
Lubricating oil further mediate 10 minutes, obtain original pug；Pugging then is carried out to original pug, plasticity mud section is made, and
The aging 48h in 25 ± 3 DEG C, the environment of relative humidity 65 ± 5%；
(3) gained plasticity mud section is extruded into 143.8 × 481mm of Ф, 300 holes/square inch, wall thickness on molding machine
The honeycomb structure of 8mil, then progress microwave sizing, control power 100kw, 0.5 meter per second of charging rate, and in 90-130
It DEG C carries out drying 13 hours or more, green body is made；
(4) green body after drying is cut into the ceramic honey comb green compact semi-finished product for requiring height (157.0mm), according to Fig. 1
Ceramic honey comb GPF firing temperature controlling curve be fired into ceramic honey comb, actual temp control program includes:
Start in reaction to when carrying out to 120min, controls reaction temperature by room temperature and rise to 150 DEG C；
Then in 675min, reaction temperature is controlled by 150 DEG C and rises to 600 DEG C；
Then in 480min, reaction temperature is controlled by 600 DEG C and rises to 1000 DEG C；
Then in 200min, reaction temperature is controlled by 1000 DEG C and rises to 1100 DEG C；
Then in 60min, reaction temperature is controlled by 1100 DEG C and rises to 1200 DEG C；
Then in 720min, reaction temperature is controlled by 1200 DEG C and rises to 1415 DEG C；
Then, in 1415 DEG C progress insulation reaction 8 hours；
Product firing is handled after finishing through punching, plug-hole, surrounding edge, obtains finished product.Through detecting, product sintering qualified rate
It is 100%.
Embodiment 2
Gasoline engine exhaust aftertreatment honeycomb ceramic filter body described in the present embodiment, preparing raw material includes that basis is main
Material and additive；
The basis major ingredient is in terms of its total amount, the component including following mass content:
Talcum 40.30wt%；
Raw kaolin 6wt%；
Aluminium oxide 12.70wt%；
Hydrated alumina 23wt%；
Silica 1 8wt%.
In terms of the total amount of the basic major ingredient, the additive includes the component of following mass content ratio:
Graphene presoma 7wt%；
Starch 8wt%；
Shell powder 25wt%；
Fluoropolymer resin (polystyrene) 10wt%；
Binder (methylcellulose) 5wt%；
Lubricating oil (plant soya-bean oil) 1.5wt%；
Brominated Polystyrene fire retardant 3.0wt%.
Gasoline engine exhaust aftertreatment honeycomb ceramic filter body described in the present embodiment, preparation method include following step
It is rapid:
(1) in Vacuum mixer, 40.30kg talcum is sequentially added, the raw kaolin of 6.0kg, 12.70kg aluminium oxide,
23.0kg hydrated alumina, 18.0kg silica, 7.0kg graphene presoma, 8.0kg starch, 25.0kg fruit stone powder,
10.0kg fluoropolymer resin, 7.5kg binder, 3.0kg brominated Polystyrene fire retardant, unlatching batch mixer progress vacuum is dry-mixed,
Closelypacked homogeneous mixture, as mixed powder is made；
(2) gained mixed powder is placed in kneader, the water that 47.2kg is added is mediated 7 minutes, later, 1.5kg is added
Lubricating oil further mediate 10 minutes, obtain original pug；Pugging then is carried out to original pug, plasticity mud section is made, and
The aging 48h in 25 ± 3 DEG C, the environment of relative humidity 65 ± 5%；
(3) gained plasticity mud section is extruded into 143.8 × 481mm of Ф, 300 holes/square inch, wall thickness on molding machine
The honeycomb structure of 8mil, then progress microwave sizing, control power 100kw, 0.5 meter per second of charging rate, and in 90-130
It DEG C carries out drying and processing 13 hours or more, green body is made；
(4) green body after drying is cut into requirement height (157.0mm) ceramic honey comb green compact semi-finished product, according to the bee of Fig. 1
Nest ceramics GPF firing temperature controlling curve is fired into ceramic honey comb, actual temp control program includes:
In reaction starts to progress to 120min, reaction temperature is controlled by room temperature and rises to 150 DEG C；
Then in 675min, reaction temperature is controlled by 150 DEG C and rises to 600 DEG C；
Then in 480min, reaction temperature is controlled by 600 DEG C and rises to 1000 DEG C；
Then in 200min, reaction temperature is controlled by 1000 DEG C and rises to 1100 DEG C；
Then in 60min, reaction temperature is controlled by 1100 DEG C and rises to 1200 DEG C；
Then in 720min, reaction temperature is controlled by 1200 DEG C and rises to 1415 DEG C；
Then, in 1415 DEG C insulation reaction 8 hours；
Product firing is handled after finishing through punching, plug-hole, surrounding edge, obtains finished product.Through detecting, product sintering qualified rate
It is 97.4%.
Embodiment 3
Gasoline engine exhaust aftertreatment honeycomb ceramic filter body described in the present embodiment, preparing raw material includes that basis is main
Material and additive；
The basis major ingredient is in terms of its total amount, the component including following mass content:
Talcum 40.30wt%；
Raw kaolin 6wt%；
Aluminium oxide 12.70wt%；
Hydrated alumina 23wt%；
Silica 1 8wt%.
In terms of the total amount of the basic major ingredient, the additive includes the component of following mass content ratio:
Graphene presoma 7wt%；
Starch 8wt%；
Shell powder 25wt%；
Fluoropolymer resin (polyacrylic acid) 10wt%；
Binder (hydroxypropyl methyl cellulose) 5wt%；
Lubricating oil (base oil) 1.5wt%；
Brominated Polystyrene fire retardant 7.0wt%.
Gasoline engine exhaust aftertreatment honeycomb ceramic filter body described in the present embodiment, preparation method include following step
It is rapid:
(1) in Vacuum mixer, 40.30kg talcum is sequentially added, the raw kaolin of 6.0kg, 12.70kg aluminium oxide,
23.0kg hydrated alumina, 18.0kg silica, 7.0kg graphene presoma, 8.0kg starch, 25.0kg fruit stone powder,
10.0kg fluoropolymer resin, 7.5kg binder, 5.0kg brominated Polystyrene fire retardant, unlatching batch mixer progress vacuum is dry-mixed,
Closelypacked homogeneous mixture, as mixed powder is made；
(2) gained mixed powder is placed in kneader, the water that 47.2kg is added is mediated 7 minutes, later, 1.5kg is added
Lubricating oil further mediate 10 minutes, obtain original pug；Pugging then is carried out to original pug, plasticity mud section is made, and
The aging 48h in 25 ± 3 DEG C, the environment of relative humidity 65 ± 5%；
(3) gained plasticity mud section is extruded into 143.8 × 481mm of Ф, 300 holes/square inch, wall thickness on molding machine
The honeycomb structure of 8mil, then progress microwave sizing, control microwave power 100kw, 0.5 meter per second of charging rate, and in 90-
130 DEG C progress drying and processing 13 hours or more, green body is made；
(4) green body after drying is cut into requirement height (157.0mm) ceramic honey comb green compact semi-finished product, according to the bee of Fig. 1
Nest ceramics GPF firing temperature controlling curve is fired into ceramic honey comb, and specific temperature control program includes:
In reaction starts to progress to 120min, reaction temperature is controlled by room temperature and rises to 150 DEG C；
Then in 675min, reaction temperature is controlled by 150 DEG C and rises to 600 DEG C；
Then in 480min, reaction temperature is controlled by 600 DEG C and rises to 1000 DEG C；
Then in 200min, reaction temperature is controlled by 1000 DEG C and rises to 1100 DEG C；
Then in 60min, reaction temperature is controlled by 1100 DEG C and rises to 1200 DEG C；
Then in 720min, reaction temperature is controlled by 1200 DEG C and rises to 1415 DEG C；
Then in 1415 DEG C progress insulation reaction 8 hours；
Product firing is handled after finishing through punching, plug-hole, surrounding edge, obtains finished product.Through detecting, product sintering qualified rate
It is 93.2%.
Embodiment 4
Gasoline engine exhaust aftertreatment honeycomb ceramic filter body described in the present embodiment, preparing raw material includes that basis is main
Material and additive；
The basis major ingredient is in terms of its total amount, the component including following mass content:
Talcum 35wt%；
Raw kaolin 5wt%；
Aluminium oxide 15wt%；
Hydrated alumina 25wt%；
Silica 20wt%.
In terms of the total amount of the basic major ingredient, the additive includes the component of following mass content ratio:
Graphene presoma 5wt%；
Starch 10wt%；
Shell powder 20wt%；
Fluoropolymer resin (polyacrylic resin) 15wt%；
Binder (poly-vinyl alcohol solution) 5wt%；
Lubricating oil (plant soybean oil) 2wt%；
Brominated Polystyrene fire retardant 3.0wt%.
The preparation method is the same as that of Example 1 with honeycomb ceramic filter body for gasoline engine exhaust aftertreatment described in the present embodiment.
Embodiment 5
Gasoline engine exhaust aftertreatment honeycomb ceramic filter body described in the present embodiment, preparing raw material includes that basis is main
Material and additive；
The basis major ingredient is in terms of its total amount, the component including following mass content:
Talcum 45wt%；
Raw kaolin 4wt%；
Aluminium oxide 11wt%；
Hydrated alumina 20wt%；
Silica 20wt%.
In terms of the total amount of the basic major ingredient, the additive includes the component of following mass content ratio:
Graphene presoma 10wt%；
Starch 5wt%；
Shell powder 30wt%；
Fluoropolymer resin (polyacrylic resin) 5wt%；
Binder (poly-vinyl alcohol solution) 10wt%；
Lubricating oil (technical white oil) 1wt%；
Brominated Polystyrene fire retardant 7.0wt%.
The preparation method is the same as that of Example 1 with honeycomb ceramic filter body for gasoline engine exhaust aftertreatment described in the present embodiment.
Embodiment 6
Gasoline engine exhaust aftertreatment honeycomb ceramic filter body described in the present embodiment, preparing raw material includes that basis is main
Material and additive；
The basis major ingredient is in terms of its total amount, the component including following mass content:
Talcum 45wt%；
Raw kaolin 8wt%；
Aluminium oxide 10wt%；
Hydrated alumina 22wt%；
Silica 1 5wt%.
In terms of the total amount of the basic major ingredient, the additive includes the component of following mass content ratio:
Graphene presoma 7wt%；
Starch 8wt%；
Shell powder 25wt%；
Fluoropolymer resin (polyacrylic resin) 10wt%；
Binder (methylcellulose) 5wt%；
Lubricating oil (base oil) 1.5wt%；
Brominated Polystyrene fire retardant 5.0wt%.
The preparation method is the same as that of Example 1 with honeycomb ceramic filter body for diesel exhaust aftertreatment described in the present embodiment.
Comparative example 1
Gasoline engine exhaust aftertreatment honeycomb ceramic filter body described in this comparative example, preparing raw material includes that basis is main
Material and additive；
The basis major ingredient is in terms of its total amount, the component including following mass content:
Talcum 40.30wt%；
Raw kaolin 6wt%；
Aluminium oxide 12.70wt%；
Hydrated alumina 23wt%；
Silica 1 8wt%.
In terms of the total amount of the basic major ingredient, the additive includes the component of following mass content ratio:
Graphene presoma 7wt%；
Starch 8wt%；
Shell powder 25wt%；
Fluoropolymer resin (polyacrylic resin) 10wt%；
Binder (methylcellulose) 5wt%；
Lubricating oil (vegetable oil soybean oil) 1.5wt%.
Gasoline engine exhaust aftertreatment honeycomb ceramic filter body described in this comparative example, preparation method include following step
It is rapid:
(1) in Vacuum mixer, 40.30kg talcum is sequentially added, the raw kaolin of 6.0kg, 12.70kg aluminium oxide,
23.0kg hydrated alumina, 18.0kg silica, 7.0kg graphene presoma, 8.0kg starch, 25.0kg fruit stone powder,
10.0kg fluoropolymer resin, 7.5kg binder, unlatching batch mixer progress vacuum is dry-mixed, and closelypacked uniform mixing is made
Object, as mixed powder；
(2) gained mixed powder is placed in kneader, the water that 47.2kg is added is mediated 7 minutes, later, 1.5kg is added
Lubricating oil further mediate 10 minutes, obtain original pug；Pugging then is carried out to original pug, plasticity mud section is made, and
The aging 48h in 25 ± 3 DEG C, the environment of relative humidity 65 ± 5%；
(3) gained plasticity mud section is extruded into 143.8 × 481mm of Ф, 300 holes/square inch, wall thickness on molding machine
The honeycomb structure of 8mil, then progress microwave sizing, control microwave power 100kw, 0.5 meter per second of charging rate, and in 90-
130 DEG C progress drying and processing 13 hours or more, green body is made；
(4) green body after drying is cut into requirement height (157.0mm) ceramic honey comb green compact semi-finished product, shows according to Fig. 2
The traditional ceramic honey comb GPF firing temperature controlling curve of the prior art is fired into ceramic honey comb, and actual temp controls program
Include:
In reaction starts to progress to 120min, reaction temperature is controlled by room temperature and rises to 150 DEG C；
Then in 5400min, reaction temperature is controlled by 150 DEG C and rises to 600 DEG C；
Then in 480min, reaction temperature is controlled by 600 DEG C and rises to 1000 DEG C；
Then in 200min, reaction temperature is controlled by 1000 DEG C and rises to 1100 DEG C；
Then in 60min, reaction temperature is controlled by 1100 DEG C and rises to 1200 DEG C；
Then in 720min, reaction temperature is controlled by 1200 DEG C and rises to 1415 DEG C；
Heat preservation 8 hours is then carried out in 1415 DEG C；Product firing is handled after finishing through punching, plug-hole, surrounding edge, is obtained
Finished product.Through detecting, product sintering qualified rate is 80.1%.
Experimental example
1, sintering procedure parameter testing
Respectively to data such as the product qualification rates of ceramic honey comb sintering procedure described in above-described embodiment 1-3 and comparative example 1
It is measured, specific measurement result see the table below 1.
1 sintering procedure parameter testing result of table compares
From upper table data as it can be seen that fire retardant is to organic in ceramic honey comb GPF sintering process in ceramic honey comb of the present invention
Object catabolic phase heating rate, total firing time, product qualification rate have the influence of highly significant；Add the resistance of 3.0-7.0wt%
Combustion agent can make in GPF sintering procedure organic matter catabolic phase heating rate be increased to 40 DEG C/h, total firing time from 5 DEG C/h
It is reduced to 45.58h from 124.33h, product qualification rate is increased to 93.2% or even 100% from 80.1%.
2, ceramic honey comb properties of product are tested
The performance that ceramic honey comb product is made in above-described embodiment 1-3 and comparative example 1 is tested respectively, test refers to
Mark includes thermal expansion coefficient (- 800 DEG C of room temperature), porosity, average pore size, is parallel to axial compression strength (A axis pressure resistance
Degree), thermal shock resistance；And GPF is packaged, it is installed to the global Light-duty Vehicle of progress on gasoline car and unifies cyclic test WLTC
Test, tests the ceramic honey comb to the filter efficiency of PM and PN, is recorded in the following table 2.
2 ceramic honey comb properties of product test result of table
From upper table data it is found that the product performance index that honeycomb ceramic filter body is made in the method for the invention can reach
To existing product level, meet the performance requirement of finished product GPF, to the filter efficiency of PM and PN more than 95%, can satisfy
The requirement of state's six stages Light-duty Vehicle pollutant emission limit.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.
For those of ordinary skill in the art, other various forms of changes can also be made on the basis of the above description
Change or changes.There is no necessity and possibility to exhaust all the enbodiments.And obvious change extended from this
Change or changes still within the protection scope of the invention.
Claims (10)
1. a kind of gasoline engine exhaust aftertreatment honeycomb ceramic filter body, which is characterized in that the system of the honeycomb ceramic filter body
Standby raw material includes basic major ingredient and additive；
The basis major ingredient is in terms of its total amount, the component including following mass content:
Talcum 35-45wt%；
Raw kaolin 4-8wt%；
Aluminium oxide 10-15wt%；
Hydrated alumina 20-25wt%；
Silica 1 5-20wt%；
The additive includes the brominated flame retardant for accounting for the basic major ingredient total amount 3-7wt%.
2. gasoline engine exhaust aftertreatment honeycomb ceramic filter body according to claim 1, which is characterized in that the bromination
The additive amount of fire retardant accounts for the 5wt% of the basic major ingredient total amount.
3. gasoline engine exhaust aftertreatment honeycomb ceramic filter body according to claim 1 or 2, which is characterized in that described
Basic major ingredient is in terms of its total amount, the component including following mass content:
Talcum 40.30wt%；
Raw kaolin 6wt%；
Aluminium oxide 12.70wt%；
Hydrated alumina 23wt%；
Silica 1 8wt%.
4. gasoline engine exhaust aftertreatment honeycomb ceramic filter body according to claim 1-3, which is characterized in that
In terms of the total amount of the basic major ingredient, the additive further includes the component of following mass content:
Graphene presoma 5-10wt%；
Starch 5-10wt%；
Fruit stone powder 20-30wt%；
Fluoropolymer resin 5-15wt%；
Binder 5-10wt%；
Lubricating oil 1-2wt%.
5. gasoline engine exhaust aftertreatment honeycomb ceramic filter body according to claim 4, which is characterized in that with the base
The total amount meter of plinth major ingredient, the additive further include the component of following mass content:
Graphene presoma 7wt%；
Starch 8wt%；
Fruit stone powder 25wt%；
Fluoropolymer resin 10wt%；
Binder 7.5wt%；
Lubricating oil 1.5wt%.
6. gasoline engine exhaust aftertreatment honeycomb ceramic filter body according to claim 4 or 5, it is characterised in that:
The brominated flame retardant includes brominated Polystyrene and/or brominated epoxy resin；
The fluoropolymer resin includes polystyrene, polyacrylic resin, polymethyl methacrylate；
The binder includes methylcellulose, hydroxypropyl methyl cellulose, poly-vinyl alcohol solution, starch ether；
The lubricating oil includes base oil, technical white oil, vegetable oil；
The partial size of the fruit stone powder is 20-40 μm.
7. a kind of method for preparing gasoline engine exhaust aftertreatment honeycomb ceramic filter body described in any one of claims 1-6,
It is characterized by comprising the following steps:
(1) it takes a selected amount of talcum, raw kaolin, aluminium oxide, hydrated alumina, silica, graphene presoma, form sediment
Powder, fruit stone powder, fluoropolymer resin, binder and brominated flame retardant, progress vacuum is dry-mixed, and mixed powder is made；
(2) gained mixed powder is added into water and the lubricating oil, and carries out kneading processing；Modeling then is made in the pug white silk of kneading
Property mud section, and carry out aging processing；
(3) GPF honeycomb structure is made in mud section obtained extrusion, and carries out drying and processing, green body is made；
(4) after the green body after drying being cut to desired height, carry out ceramic honey comb firing, and through punching, plug-hole, surrounding edge at
Reason, finished product.
8. the method for gasoline engine exhaust aftertreatment honeycomb ceramic filter body described in preparation according to claim 7,
It is characterized in that, in the step (4), the temperature controlled processes of the ceramic honey comb the firing step include:
150 DEG C are risen to by room temperature in 60-120min, controlling reaction temperature；
600 DEG C are risen to by 150 DEG C in 630-690min, controlling reaction temperature；
1000 DEG C are risen to by 600 DEG C in 420-480min, controlling reaction temperature；
1100 DEG C are risen to by 1000 DEG C in 180-240min, controlling reaction temperature；
1200 DEG C are risen to by 1100 DEG C in 40-90min, controlling reaction temperature；
1415 DEG C are risen to by 1200 DEG C in 660-780min, controlling reaction temperature；
Then in 1415 DEG C insulation reaction 8-11 hours.
9. the method for gasoline engine exhaust aftertreatment honeycomb ceramic filter body described in preparation according to claim 7 or 8,
It is characterized in that, in the step (2):
The additive amount of the water accounts for the 25-35wt% of the mixed powder doses；
The temperature of the aging step is 25 ± 3 DEG C, relative humidity 65 ± 5%.
10. according to gasoline engine exhaust aftertreatment honeycomb ceramic filter body described in the described in any item preparations of claim 7-9
Method, which is characterized in that in the step (3), the GPF honeycomb structure is having a size of Ф (93-143.8) × (101.6-
481mm), the hole 200-300/square inch, wall thickness 8-10mil.
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