CN109650934A - The method for preparing gasoline car grain catcher using fumed silica - Google Patents
The method for preparing gasoline car grain catcher using fumed silica Download PDFInfo
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- CN109650934A CN109650934A CN201910099893.2A CN201910099893A CN109650934A CN 109650934 A CN109650934 A CN 109650934A CN 201910099893 A CN201910099893 A CN 201910099893A CN 109650934 A CN109650934 A CN 109650934A
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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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0006—Honeycomb structures
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- C04B33/02—Preparing or treating the raw materials individually or as batches
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- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/131—Inorganic additives
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Abstract
The present invention relates to pollutant of gasoline engine exhaust gas post-processing technology fields, and in particular to a method of low pressure drop, low-expansion coefficient cordierite gasoline vehicle exhaust grain catcher are prepared using fumed silica.Method of the invention includes the steps that following: (1) dry mixed inorganic raw material, and binder is added；(2) it mediates；(3) practice system；(4) it squeezes out, microwave, drying；(5) it cuts, be sintered；(6) enter kiln after punching, plug-hole to flash back.Use fumed silica material for raw material trap, pore-creating significant effect, microporous connectivity is preferable, therefore can reduce pressure drop and the thermal expansion coefficient of trap；Fumed silica can substitute general silica simultaneously, not only haved the function that as inorganic component, but also play pore-creating effect, can reduce the additive amount of organic pore-forming agents；The use of fumed silica can not only satisfy the use demand, while reduce production cost, improve production efficiency.
Description
Technical field
The present invention relates to pollutant of gasoline engine exhaust gas post-processing technology fields, and in particular to a kind of low pressure drop, low bulk system
The preparation method of number cordierite gasoline vehicle exhaust grain catcher, more particularly to low pressure is prepared using fumed silica
Drop, the method for low-expansion coefficient cordierite gasoline vehicle exhaust grain catcher.
Background technique
The increase of automobile quantity leads to the increase of granular material discharged quantity, and haze weather is got worse.In-cylinder direct-jet gasoline
The advantages that machine (GDI) is because of its preferable dynamic property, fuel economy, driving and discharge, obtains more and more extensive use, but
The concentration distribution of gaseous mixture is uneven in GDI cylinder of internal-combustion engine, directly causes a large amount of formation and discharge of particulate matter.With environmental protection
Regulation it is increasingly strict, gasoline engine particulate matter trap (GPF) is most effective, the most reliable technology hand for solving the problems, such as this
Section.
Diesel particulate trap and diesel particulate trap are closely similar in structure, and this kind of trap is typically designed wall-forming
The inlet end of streaming structure, duct is opening pattern, and outlet side is usually blocked with ceramic plugging cement, and end face is made to form chessboard mould
Cigarette ash is captured in by the blocking pattern of formula when exhaust gas is by the porous ceramic walls of trap air intake duct and adjacent gas off-take
On the porous channel wall of cellular filter bodies, so that cigarette ash be separated from gasoline exhaust stream.
This kind of trap is more demanding to pressure drop and filter efficiency, and lower pressure drop is the base realized compared with filtration efficiency
Plinth.In trap the source of pressure drop be mainly entrance pressure losses, the friction loss for flowing through duct, the pressure loss for flowing through wall,
Four part of the export expansion pressure loss, the pressure loss for flowing through wall is the main pressure loss.Reduction flows through the pressure loss of wall just
It is required that material not only has porosity, but also microporous connectivity is preferable.Therefore, high porosity is one of GPF very crucial
Technical indicator, generally 60% or more, this is also a very important technological difficulties in the development and production of trap.This be because
More organic pore-forming agents will be added by meaning that for high porosity, and the additive amount of organic pore-forming agents is to influence product firing qualification
One extremely important factor of rate.
The applicant is to use general silica as raw material before improving and obtaining technical solution of the present invention,
Pore-creating is carried out by addition organic pore-forming agents.In order to guarantee that product has lower pressure drop, organic pore-forming agents additive amount is more, and
And the decomposition temperature of organic pore-forming agents is more concentrated, and be will lead to green body and is easy kindling in sintering process, product is caused to crack.
Therefore, it in order to improve above-mentioned deficiency, that is, avoids the occurrence of green body and is easy kindling in sintering process, product is caused to open
The phenomenon that splitting needs to invent the trap of a kind of low pressure drop and low thermal coefficient of expansion.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of purifying vehicle exhaust ceramic honeycomb substrates, especially
It is related to particle purifying cordierite diesel particulate trap product in tail-gas from gasoline automobiles, solves height existing for current trap
The problem of pressure drop, high thermal expansion coefficient, while solving the problems, such as that qualification rate is lower during preparing trap, significantly reduces life
Cost is produced, production efficiency is improved.
The present invention is realized by following technical solutions:
Gasoline car grain catcher is prepared using fumed silica, it is major ingredient preparation which, which is by raw material below,
It is obtained:
Talcum；Aluminium oxide, hydrated alumina, at least one of fumed silica and/or silica, graphite, shallow lake
Powder, binder.
Maximum feature of the invention is, in above-mentioned formula, uses fumed silica, its advantage is that: gas phase dioxy
SiClx is a kind of purity is high, large specific surface area, high temperature resistant, nontoxic and pollution-free environmentally protective new material, and the material is loose because of its
Porous structure have more excellent pore-creating effect, while in the material silica content it is higher, silica is also
A kind of composition of cordierite material is formed, so, fumed silica both reached as a kind of inorganic pore creating material, its use
Pore-creating purpose, while reducing the dosage of pore creating material, it is most important that the sintering qualified rate of product is significantly improved, is substantially reduced
Production cost, improves production efficiency.The present inventor is answered fumed silica by many experiments and creative work
In production for trap of the invention, a kind of two kinds of functions of material are realized, and have trap product obtained
There is the characteristics of low pressure drop and low thermal coefficient of expansion.
Specifically, the parts by weight of each raw material dosage are as follows in above-mentioned trap:
35~45 parts of talcum, 0~15 part of kaolin a, 0~15 part of kaolin b；Kaolin a is: raw kaolin；Kaolinite
Native b is: calcined kaolin；
10~35 parts of aluminium oxide；
0~25 part of hydrated alumina；
0~25 part of fumed silica, 0~25 part of silica；
5~15 parts of graphite, 15~35 parts of starch, 5~10 parts of binder；
In fumed silica and silica, must there are a kind of presence, i.e. fumed silica and silica, the two
Parts by weight cannot simultaneously be 0.
The porosity of above-mentioned trap is 60~70%.
The above-mentioned method for preparing gasoline car grain catcher using fumed silica, includes the following steps:
(1) dry mixed talcum, aluminium oxide, hydrated alumina, fumed silica, silica, graphite, starch add
Enter binder；
(2) it mediates；
(3) practice the pug of system kneading into mud section；
(4) band crust squeezes out mud section, then microwave treatment, drying；
(5) it cuts, be sintered；
(6) enter kiln after punching, plug-hole to flash back；
The above-mentioned method for preparing gasoline car grain catcher using fumed silica, includes the following steps:
(1) dry mixed talcum, kaolin a, kaolin b, aluminium oxide, hydrated alumina, fumed silica, titanium dioxide
Binder is added in silicon, graphite, starch；
(2) it mediates；
(3) practice the pug of system kneading into mud section；
(4) band crust squeezes out mud section, then microwave, drying；
(5) it cuts, be sintered；
(6) enter kiln after punching, plug-hole to flash back.
Preferably, above-mentioned step (1) inorganic component following using dry mixed: the cunning of 35.0~45.0 parts by weight
Stone, the aluminium oxide of 12~26 parts by weight, the hydrated alumina of 6~18 parts by weight, the fumed silica of 5~25 parts by weight, 6~
The silica of 25 parts by weight；
It takes again and accounts for 13~15% graphite of inorganic component total weight, 24~26% starch, be added in above-mentioned inorganic component,
Obtain mixed material；
It is eventually adding binder, the additional amount of binder accounts for the 8% of mixed material total weight；
Kaolin is either added in the feed, specific as follows:
(1) inorganic component following using dry mixed: the talcum of 35.0~45.0 parts by weight, the oxygen of 12~26 parts by weight
Change aluminium, the hydrated alumina of 6~18 parts by weight, the fumed silica of 5~25 parts by weight, the silica of 6~25 parts by weight,
The kaolin a of 0~15.0 parts by weight, the kaolin b of 0~15.0 parts by weight (both kaolin a and kaolin b are not 0 simultaneously)；
The starch for taking the graphite, 24~26% that account for inorganic component total weight 13~15% again is added to above-mentioned no unit
In point, mixed material is obtained；
It is eventually adding binder, the additional amount of binder accounts for the 8% of mixed material total weight；
(2) 28~32% weight waters that the raw material that mixing finishes is placed in addition total raw material in kneading machine are subjected to kneading 6
~8 minutes, the additive that 0.8~1.2% weight of total raw material is added was mediated 8~12 minutes.
(3) practice the pug mediated in step (2) processed into mud section.
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
As a preferred scheme, the side of gasoline car grain catcher is prepared in the present invention using fumed silica
Method includes the steps that following:
(1) inorganic component following using dry mixed: the talcum of 40.47 parts by weight, the kaolin a of 8 parts by weight,
The aluminium oxide of 18.93 parts by weight, the hydrated alumina of 15 parts by weight, the silica of 9.6 parts by weight, the gas phase two of 8 parts by weight
Silica；
It takes again and accounts for 14% graphite of inorganic component total weight, 25% starch, be added in above-mentioned inorganic component, obtain mixture
Material；
It is eventually adding binder, the additional amount of binder accounts for the 8% of mixed material total weight；
(2) 30% weight water that the raw material that mixing finishes is placed in addition total raw material in kneading machine mediate 7 minutes,
The additive that 1% weight of total raw material is added is mediated 10 minutes；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
As another preferred scheme, the method for preparing gasoline car grain catcher using fumed silica, including
Following steps:
(1) inorganic component following using dry mixed: the talcum of 40.99 parts by weight, the aluminium oxide of 22.38 parts by weight,
The hydrated alumina of 15 parts by weight, the silica of 15.63 parts by weight, the fumed silica of 6 parts by weight；
It takes again and accounts for 14% graphite of inorganic component total weight, 25% starch, be added in above-mentioned inorganic component, obtain mixture
Material；
It is eventually adding binder, the additional amount of binder accounts for the 8% of mixed material total weight；
(2) 30% weight water that the raw material that mixing finishes is placed in addition total raw material in kneading machine mediate 7 minutes,
The additive that 1% weight of total raw material is added is mediated 10 minutes；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
The present invention prepares the side of low pressure drop, low-expansion cordierite diesel particulate trap using fumed silica
Method, the trap have lower pressure drop, the lower coefficient of expansion and higher sintering qualified rate.The porosity of such trap
Generally 60~70%, porosity is mainly realized by pore creating material, is left hole after pore creating material sintering and is achieved the purpose that pore-creating, high
Porosity is then intended to add larger amount of pore creating material, this has vital influence to the sintering qualified rate of product.
The pore creating material used on trap at present is generally organic pore-forming agents, and the amount of pore creating material means that they burn
The complete time used is longer, so that a possibility that illustrating firing cracking is bigger, it is furtherly exactly that sintering qualified rate is lower.Gas phase
Earth silicon material has loose porous structure, and this material has apparent advantage for pore-creating, can increase micropore
Connectivity, it is often more important that its main ingredient be silica, be a kind of inorganic material, and purity is higher, specific surface
Product is big, easy-sintering, and its sintering temperature is different from the sintering temperature section of common organic pore-forming agents, and pore creating materials a variety of in this way exist
Different temperature range sintering advantageously reduce the intracorporal temperature difference of filtering, shorten the sintering time in a certain temperature range, significantly
Improve sintering qualified rate.Fumed silica pore-creating significant effect simultaneously, microporous connectivity is preferable, therefore can reduce trapping
The pressure drop of device and thermal expansion coefficient.
Fumed silica is a kind of composition for forming cordierite, can substitute general silica, both reach conduct
The effect of inorganic component, and pore-creating effect is played, the additive amount of organic pore-forming agents can be reduced.So fumed silica
Using can not only satisfy the use demand, while production cost is reduced, improves production efficiency.
The beneficial effects of the present invention are use fumed silica material for raw material trap, pore-creating significant effect is micro-
Hole connectivity is preferable, therefore can reduce pressure drop and the thermal expansion coefficient of trap；Fumed silica can substitute general simultaneously
Logical silica has not only haved the function that as inorganic component, but also has played pore-creating effect, can reduce adding for organic pore-forming agents
Dosage also solves the lower problem of qualification rate during preparing trap；The use of fumed silica can not only meet
Use demand, while production cost is reduced, improve production efficiency.
Detailed description of the invention
Fig. 1 is fumed silica micro image, amplification factor 1K；
Fig. 2 is fumed silica micro image, amplification factor 10K；
Fig. 3 is diesel particulate trap micro image in embodiment 8；
Fig. 4 is diesel particulate trap micro image in comparative example 1；
Fig. 5 is diesel particulate trap micro image in embodiment 3；
Fig. 6 is the flow chart that diesel particulate filter device is prepared using fumed silica.
Specific embodiment
The present invention will be further explained combined with specific embodiments below, so that those skilled in the art knows more about
The present invention, but be not intended to limit the present invention.
Kaolin a mentioned in the present invention is: raw kaolin；
Kaolin b is: calcined kaolin；Following embodiment comparative example is same, unless otherwise specified.
Embodiment 1
(1) using dry mixed inorganic component: the talcum of 40.35% weight, the kaolin a of 7% weight, 7% weight
Kaolin b, the aluminium oxide of 15.43% weight, the hydrated alumina of 16% weight, the fumed silica of 7.11% weight,
The silica of 7.11% weight；(inorganic component in following embodiment herewith, unless otherwise specified)
Dry mixed: weighed solid powder being placed in agravic batch mixer and mixes the set time, by various raw material
Uniformly mixing；(following embodiment and comparative example is same)
Then the graphite of 14% weight, the starch of 25% weight, the binder methylcellulose of 8% weight, system are added
Must have closelypacked homogeneous mixture, wherein graphite, starch additive amount added on the basis of inorganic component, bond
The additive amount of agent adds on the basis of total mixed component；
Binder is mainly water-soluble high-molecular material, plays the role of being bonded pug offer plasticity, mainly includes methyl
Cellulose, hydroxypropyl methyl cellulose, hydroxyethylmethylcellulose, hydroxyethyl cellulose, carboxymethyl cellulose, polyvinyl alcohol,
Starch ether, dispersible regenerative latex powder etc., for above raw material as binder, the effect reached is almost the same；
(2) water that the powder that mixing finishes is placed in kneading machine 30% weight that total powder is added is carried out mediating 7 points
Clock, the additive that 1% weight is added are mediated 10 minutes, and the additive amount of additive is added on the basis of total mixed component；Add
Agent is added to be primarily referred to as any one of stearic acid, oleic acid, lauric acid, soya-bean oil, tung oil etc., additive used in Example 1 is
Stearic acid；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
The binder used in following embodiment and comparative example is methylcellulose, and additive is stearic acid, such as
Without specified otherwise.
Embodiment 2
(1) using dry mixed inorganic component: the talcum of 40.35% weight, the kaolin a of 7% weight, 7% weight
Kaolin b, the aluminium oxide of 15.43% weight, the hydrated alumina of 16% weight, the fumed silica of 14.22% weight；
Then the graphite of 14% weight, the starch of 25% weight, the binder methylcellulose of 8% weight, system are added
Must have closelypacked homogeneous mixture, wherein graphite, starch additive amount added on the basis of inorganic component, bond
The additive amount of agent adds on the basis of total mixed component；
(2) water that the powder that mixing finishes is placed in kneading machine 30% weight that total powder is added is carried out mediating 7 points
Clock, the additive stearic acid that 1% weight is added are mediated 10 minutes, and the additive amount of additive is added on the basis of total mixed component
Add；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
Embodiment 3
(1) use 40.53% weight of dry mixed talcum, the kaolin a of 4% weight, the kaolin b of 10% weight,
The aluminium oxide of 15.36% weight, the hydrated alumina of 16% weight, the fumed silica of 14.11% weight；
The graphite of 14% weight, the starch of 25% weight are added, the binder of 8% weight is made with tightly packed
Homogeneous mixture, wherein graphite, starch additive amount added on the basis of inorganic component, the additive amount of binder is total
It is added on the basis of mixed component；
(2) water that the powder that mixing finishes is placed in kneading machine 30% weight that total powder is added is carried out mediating 7 points
Clock, the additive that 1% weight is added are mediated 10 minutes, and the additive amount of additive is added on the basis of total mixed component；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
Embodiment 4
(1) talcum of 38.70% weight of dry mixed, the kaolin b of 13% weight, the oxidation of 24.62% weight are used
Aluminium, the hydrated alumina of 11.68% weight, the fumed silica of 12% weight；
The graphite of 14% weight, the starch of 25% weight are added, the binder of 8% weight is made with tightly packed
Homogeneous mixture, wherein graphite, starch additive amount added on the basis of inorganic component, the additive amount of binder is total
It is added on the basis of mixed component；
(2) water that the powder that mixing finishes is placed in kneading machine 30% weight that total powder is added is carried out mediating 7 points
Clock, the additive that 1% weight is added are mediated 10 minutes, and the additive amount of additive is added on the basis of total mixed component；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
Embodiment 5
(1) talcum of 40.47% weight of dry mixed, the kaolin a of 8% weight, the oxidation of 18.93% weight are used
Aluminium, the hydrated alumina of 15% weight, the fumed silica of 8% weight, the silica of 9.6% weight；
The graphite of 14% weight, the starch of 25% weight are added, the binder of 8% weight is made with tightly packed
Homogeneous mixture, wherein graphite, starch additive amount added on the basis of inorganic component, the additive amount of binder is total
It is added on the basis of mixed component；
(2) water that the powder that mixing finishes is placed in kneading machine 30% weight that total powder is added is carried out mediating 7 points
Clock, the additive that 1% weight is added are mediated 10 minutes, and the additive amount of additive is added on the basis of total mixed component；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
Embodiment 6
(1) talcum of 41.37% weight of dry mixed, the kaolin b of 12% weight, the oxidation of 19.28% weight are used
Aluminium, the hydrated alumina of 12% weight, the silica of 9.35% weight, the fumed silica of 6% weight；
The graphite of 14% weight, the starch of 25% weight are added, the binder of 8% weight is made with tightly packed
Homogeneous mixture, wherein graphite, starch additive amount added on the basis of inorganic component, the additive amount of binder is total
It is added on the basis of mixed component；
(2) water that the powder that mixing finishes is placed in kneading machine 30% weight that total powder is added is carried out mediating 7 points
Clock, the additive that 1% weight is added are mediated 10 minutes, and the additive amount of additive is added on the basis of total mixed component；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
Embodiment 7
(1) talcum of 40.99% weight of dry mixed, the aluminium oxide of 22.38% weight, the hydration oxygen of 15% weight are used
Change aluminium, the fumed silica of 21.63% weight；
The graphite of 14% weight, the starch of 25% weight are added, the binder of 8% weight is made with tightly packed
Homogeneous mixture, wherein graphite, starch additive amount added on the basis of inorganic component, the additive amount of binder is total
It is added on the basis of mixed component；
(2) water that the powder that mixing finishes is placed in kneading machine 30% weight that total powder is added is carried out mediating 7 points
Clock, the additive that 1% weight is added are mediated 10 minutes, and the additive amount of additive is added on the basis of total mixed component；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
Embodiment 8
(1) talcum of 40.99% weight of dry mixed, the aluminium oxide of 22.38% weight, the hydration oxygen of 15% weight are used
Change aluminium, the silica of 15.63% weight, the fumed silica of 6% weight；
The graphite of 14% weight, the starch of 25% weight are added, the binder of 8% weight is made with tightly packed
Homogeneous mixture, wherein graphite, starch additive amount added on the basis of inorganic component, the additive amount of binder is total
It is added on the basis of mixed component；
(2) water that the powder that mixing finishes is placed in kneading machine 30% weight that total powder is added is carried out mediating 7 points
Clock, the additive that 1% weight is added are mediated 10 minutes, and the additive amount of additive is added on the basis of total mixed component；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
Comparative example 1
(1) use 40.35% weight of dry mixed talcum, the kaolin a of 7% weight, the kaolin b of 7% weight,
The aluminium oxide of 15.43% weight, the hydrated alumina of 16% weight, the silica of 14.22% weight；
The graphite of 14% weight, the starch of 25% weight are added, the binder of 8% weight is made with tightly packed
Homogeneous mixture, wherein graphite, starch additive amount added on the basis of inorganic component, the additive amount of binder is total
It is added on the basis of mixed component；
(2) water that the powder that mixing finishes is placed in kneading machine 30% weight that total powder is added is carried out mediating 7 points
Clock, the additive that 1% weight is added are mediated 10 minutes, and the additive amount of additive is added on the basis of total mixed component；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
Comparative example 2
(1) use 40.53% weight of dry mixed talcum, the kaolin a of 4% weight, the kaolin b of 10% weight,
The aluminium oxide of 15.36% weight, the hydrated alumina of 16% weight, the silica of 14.11% weight；
The graphite of 14% weight, the starch of 25% weight are added, the binder of 8% weight is made with tightly packed
Homogeneous mixture, wherein graphite, starch additive amount added on the basis of inorganic component, the additive amount of binder is total
It is added on the basis of mixed component；
(2) water that the powder that mixing finishes is placed in kneading machine 30% weight that total powder is added is carried out mediating 7 points
Clock, the additive that 1% weight is added are mediated 10 minutes, and the additive amount of additive is added on the basis of total mixed component；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
Comparative example 3
(1) talcum of 38.70% weight of dry mixed, the kaolin b of 13% weight, the oxidation of 24.62% weight are used
Aluminium, the hydrated alumina of 11.68% weight, the silica of 12% weight；
The graphite of 14% weight, the starch of 25% weight are added, the binder of 8% weight is made with tightly packed
Homogeneous mixture, wherein graphite, starch additive amount added on the basis of inorganic component, the additive amount of binder is total
It is added on the basis of mixed component；
(2) water that the powder that mixing finishes is placed in kneading machine 30% weight that total powder is added is carried out mediating 7 points
Clock, the additive that 1% weight is added are mediated 10 minutes, and the additive amount of additive is added on the basis of total mixed component；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
Comparative example 4
(1) talcum of 40.47% weight of dry mixed, the kaolin a of 8% weight, the oxidation of 18.93% weight are used
Aluminium, the hydrated alumina of 15% weight, the silica of 17.6% weight；
The graphite of 14% weight, the starch of 25% weight are added, the binder of 8% weight is made with tightly packed
Homogeneous mixture, wherein graphite, starch additive amount added on the basis of inorganic component, the additive amount of binder is total
It is added on the basis of mixed component；
(2) water that the powder that mixing finishes is placed in kneading machine 30% weight that total powder is added is carried out mediating 7 points
Clock, the additive that 1% weight is added are mediated 10 minutes, and the additive amount of additive is added on the basis of total mixed component；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
Comparative example 5
(1) talcum of 41.37% weight of dry mixed, the kaolin b of 12% weight, the oxidation of 19.28% weight are used
Aluminium, the hydrated alumina of 12% weight, the silica of 15.35% weight；
The graphite of 14% weight, the starch of 25% weight are added, the binder of 8% weight is made with tightly packed
Homogeneous mixture, wherein graphite, starch additive amount added on the basis of inorganic component, the additive amount of binder is total
It is added on the basis of mixed component；
(2) water that the powder that mixing finishes is placed in kneading machine 30% weight that total powder is added is carried out mediating 7 points
Clock, the additive that 1% weight is added are mediated 10 minutes, and the additive amount of additive is added on the basis of total mixed component；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
Comparative example 6
(1) talcum of 40.99% weight of dry mixed, the aluminium oxide of 22.38% weight, the hydration oxygen of 15% weight are used
Change aluminium, the silica of 21.63% weight；
The graphite of 14% weight, the starch of 25% weight are added, the binder of 8% weight is made with tightly packed
Homogeneous mixture, wherein graphite, starch additive amount added on the basis of inorganic component, the additive amount of binder is total
It is added on the basis of mixed component；
(2) water that the powder that mixing finishes is placed in kneading machine 30% weight that total powder is added is carried out mediating 7 points
Clock, the additive that 1% weight is added are mediated 10 minutes, and the additive amount of additive is added on the basis of total mixed component；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
Each comparative example, the test result of embodiment enumerated in the present invention are shown in Table 1, table 2.
Wherein: the test condition of pressure drop is room temperature, normal pressure, flow 400Nm3/h；CTE Range of measuring temp is room temperature-
800℃。
The test method of pressure drop: after equipment operates normally, placing product to be measured, and adjustment equipment reaches target flow, will
Pressure gauge is reset, and records pressure value when flowmeter instantaneous flow reaches target flow；
The test method of CTE: EN 821: " Advanced Technical Ceramics " examination criteria is referred to.
Test result table in 1 Examples 1 to 9 of table
Test result table in 2 comparative example 1~5 of table
| Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | Comparative example 6 | |
| CTE×10-6(/℃) | 1.10 | 1.00 | 0.92 | 0.78 | 0.80 | 0.86 |
| Porosity (%) | 60.2 | 62.3 | 63.0 | 62.8 | 63.3 | 63.1 |
| Pressure drop (kPa) | 0.954 | 0.936 | 0.939 | 0.940 | 0.936 | 0.939 |
| Qualification rate (%) | 88 | 90 | 97 | 93 | 97 | 100 |
In order to which the pressure drop to embodiment compares, it is prepared for diameter 118.4mm, height 152.4mm, hole density here
The product diameter of 300cpsi, the sample of wall thickness 8mil, each embodiment and comparative example is 118.4mm, height 152.4mm, Kong Mi
Spend 300cpsi, wall thickness 8mil.Diameter, height, hole density and the wall thickness of certain material are not limited solely to this.
Test result in contrast table 1, it can be seen that material porosity can be increased by adding suitable fumed silica.
It can be seen by comparative example 1-2 and comparative example 1, embodiment 6 and comparative example 5, embodiment 7-8 and comparative example 6
Out, in other identical situations of raw material additive amount, if fumed silica additive amount is excessive, porosity reduces instead,
The porosity of material can be increased by adding suitable fumed silica, reduced product pressure drop, improved the qualification rate of product；Pass through
Comparative example 3 and comparative example 2, embodiment 4 and comparative example 3, embodiment 5 and comparative example 4 are as can be seen that fumed silica adds
In the case that dosage is excessive, compared with adding silica, material porosity and pressure drop will not be improved instead, so according to formula
It needs to select a suitable additive amount very crucial.
Can be seen that the suitable fumed silica of addition by the comparative analysis to above embodiments and comparative example can
The porosity of material is turned up, reduces product pressure drop, fumed silica, which is also illustrated, in this has preferable pore-creating effect, can reduce
A possibility that additive amount of pore creating material, the reduction of pore creating material additive amount reduces sintering cracking, the firing for improving material are qualified
Rate significantly reduces production cost, improves production efficiency；Silica does not under cryogenic react simultaneously,
It is different from the decomposition temperature section of organic pore-forming agents, pore creating material is also avoided in this way concentrates the possibility decomposed and product is caused to crack
Property, improve sintering qualified rate.
Simultaneously by a series of comparison, it is also seen that lower using the CTE of the example of fumed silica, this also with
Its pore-creating effect has well certain relationship, this is because microporous connectivity is good, expansion joint is played in connection gap when heated is reduced
The thermal expansion of cordierite, so that the cordierite bodies that the coefficient of expansion is bad lower than microporous connectivity.Simultaneously it can also be seen that using closing
The example of suitable additive amount fumed silica has lower pressure drop, this connects with material vapor silica with preferable micropore
The general character has relationship.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. preparing gasoline car grain catcher using fumed silica, which is characterized in that the trap is by raw material below
It is prepared for major ingredient obtained:
Talcum；
Aluminium oxide, hydrated alumina, at least one of fumed silica and/or silica, graphite, starch, binder.
2. preparing gasoline car grain catcher using fumed silica as described in claim 1, which is characterized in that each raw material
The parts by weight of dosage are as follows:
35~45 parts of talcum, 0~15 part of kaolin a, 0~15 part of kaolin b；Kaolin a is: raw kaolin；Kaolin b
It is: calcined kaolin；
10~35 parts of aluminium oxide；
0~25 part of hydrated alumina；
0~25 part of fumed silica, 0~25 part of silica；
5~15 parts of graphite, 15~35 parts of starch, 5~10 parts of binder；
In fumed silica and silica, there must be a kind of presence.
3. preparing gasoline car grain catcher using fumed silica as described in claim 1, which is characterized in that the trapping
The porosity of device is 60~70%.
4. the method for preparing gasoline car grain catcher using fumed silica as described in claim 1, including it is below
Step:
(1) dry mixed talcum, aluminium oxide, hydrated alumina, fumed silica, silica, graphite, starch are added viscous
Tie agent；
(2) it mediates；
(3) practice the pug of system kneading into mud section；
(4) band crust squeezes out mud section, then microwave treatment, drying；
(5) it cuts, be sintered；
(6) enter kiln after punching, plug-hole to flash back；
Either:
(1) dry mixed talcum, kaolin a, kaolin b, aluminium oxide, hydrated alumina, fumed silica, silica,
Binder is added in graphite, starch；
(2) it mediates；
(3) practice the pug of system kneading into mud section；
(4) band crust squeezes out mud section, then microwave treatment, drying；
(5) it cuts, be sintered；
(6) enter kiln after punching, plug-hole to flash back.
5. the method for preparing gasoline car grain catcher using fumed silica as claimed in claim 4, it is characterised in that:
(1) inorganic component following using dry mixed: the talcum of 35.0~45.0 parts by weight, the oxidation of 12~26 parts by weight
Aluminium, the hydrated alumina of 6~18 parts by weight, the fumed silica of 5~25 parts by weight, the silica of 6~25 parts by weight；
The starch for taking the graphite, 24~26% that account for inorganic component total weight 13~15% again, is added in above-mentioned inorganic component,
Obtain mixed material；
It is eventually adding binder, the additional amount of binder accounts for the 8% of mixed material total weight；
Either:
(1) inorganic component following using dry mixed: the talcum of 35.0~45.0 parts by weight, the oxidation of 12~26 parts by weight
Aluminium, the hydrated alumina of 6~18 parts by weight, the fumed silica of 5~25 parts by weight, the silica of 6~25 parts by weight, 0
The kaolin a of~15.0 parts by weight, the kaolin b of 0~15.0 parts by weight；
The starch for taking the graphite, 24~26% that account for inorganic component total weight 13~15% again, is added in above-mentioned inorganic component,
Obtain mixed material；
It is eventually adding binder, the additional amount of binder accounts for the 8% of mixed material total weight.
6. the method for preparing gasoline car grain catcher using fumed silica as claimed in claim 4, it is characterised in that:
(2) 28~32% weight waters that the raw material that mixing finishes is placed in addition total raw material in kneading machine are carried out 6~8 points of kneading
Clock, the additive that 0.8~1.2% weight of total raw material is added are mediated 8~12 minutes.
7. the method for preparing gasoline car grain catcher using fumed silica as claimed in claim 4, it is characterised in that:
(3) practice the pug mediated in step (2) processed into mud section.
8. the method for preparing gasoline car grain catcher using fumed silica as claimed in claim 4, it is characterised in that:
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave treatment, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
9. the method for preparing gasoline car grain catcher using fumed silica as claimed in claim 4, including following
Step:
(1) inorganic component following using dry mixed: the talcum of 40.47 parts by weight, the kaolin a of 8 parts by weight, 18.93 weights
Measure the aluminium oxide of part, the hydrated alumina of 15 parts by weight, the silica of 9.60 parts by weight, the fumed silica of 8 parts by weight；
The starch for taking the graphite, 25% that account for inorganic component total weight 14% again, is added in above-mentioned inorganic component, obtains mixture
Material；
It is eventually adding binder, the additional amount of binder accounts for the 8% of mixed material total weight；
(2) 30% weight water that the raw material that mixing finishes is placed in addition total raw material in kneading machine mediate 7 minutes, be added
The additive of 1% weight of total raw material is mediated 10 minutes；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave treatment, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
10. the method for preparing gasoline car grain catcher using fumed silica as claimed in claim 4, including following
Step:
(1) inorganic component following using dry mixed: the talcum of 40.99 parts by weight, the aluminium oxide of 22.38 parts by weight, 15 weights
Measure the hydrated alumina of part, the silica of 15.63 parts by weight, the fumed silica of 6 parts by weight；
It takes again and accounts for 14% graphite of inorganic component total weight, 25% starch, be added in above-mentioned inorganic component, obtain mixed material；
It is eventually adding binder, the additional amount of binder accounts for the 8% of mixed material total weight；
(2) 30% weight water that the raw material that mixing finishes is placed in addition total raw material in kneading machine mediate 7 minutes, be added
The additive of 1% weight of total raw material is mediated 10 minutes；
(3) practice the pug mediated in step (2) processed into mud section；
(4) the mud section with plasticity is extruded into honeycomb structure, band crust squeezes out, and then carries out microwave treatment, drying；
(5) green body after drying is sintered in 1425~1445 DEG C of high temperature after being cut into fixed height；
(6) sintered green body is punched, kiln is entered after plug-hole flashes back.
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Cited By (3)
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| CN111892384A (en) * | 2020-08-18 | 2020-11-06 | 重庆奥福精细陶瓷有限公司 | Wall-flow cordierite gasoline particle filter and preparation method thereof |
| CN111892385A (en) * | 2020-08-18 | 2020-11-06 | 重庆奥福精细陶瓷有限公司 | Preparation method of large-size diesel particle filter |
| CN113860852A (en) * | 2021-09-22 | 2021-12-31 | 云南菲尔特环保科技股份有限公司 | Cordierite gasoline engine particulate trap and preparation method thereof |
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