CN103979916A - Mullite liner outer layer for auto-exhaust catalyst and preparation method thereof - Google Patents
Mullite liner outer layer for auto-exhaust catalyst and preparation method thereof Download PDFInfo
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- CN103979916A CN103979916A CN201410177556.8A CN201410177556A CN103979916A CN 103979916 A CN103979916 A CN 103979916A CN 201410177556 A CN201410177556 A CN 201410177556A CN 103979916 A CN103979916 A CN 103979916A
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Abstract
A mullite liner outer layer for an auto-exhaust catalyst and a preparation method thereof are provided. The mullite liner outer layer is composed of the following components by weight percentage: 60-85% of a modified mullite fiber, 5-10% of a calcined alumina micro-powder, 3-10% of silica sol, 1.2-3.8% of sodium hypochlorite, 2.7-7.3% of starch, and 0.5-1.5% of an additive, wherein the sum of the contents of the components is 100%. The modified mullite fiber comprises the chemical components by weight: not less than 70% of Al2O3, not more than 25% of SiO2, and more than 1.5% of an oily substance, wherein the sum of the contents of the chemical components is 100 wt%. The preparation method comprises the steps: a) weighing the raw materials according to the proportion, mixing evenly, and thus obtaining a slurry through mixing; and b) then carrying out suction filtration molding, and drying at a temperature of 190-210 DEG C for 10 h to obtain the finished product. With utilization of the modified mullite fiber as the main raw material and under a condition of overcoming pulverization, an excellent refractory property of the product is ensured.
Description
Technical field
The present invention relates to mullite liner skin and preparation method that a kind of auto-exhaust catalyst is used, belong to fire-resistant heat insulating material technical field.
Background technology
Along with China Auto Market, both production and marketing thrive, along with and what come is the thriving demand of huge environmental protection pressure and exhaust gas treatment catalyst.Vehicle exhaust has become the large mobile source of pollution of human society one, and harm people's is healthy.Vehicle exhaust three unique catalytic converter and EFI closed-loop control are effectively to solve one of measure of automobile exhaust pollution.Conventionally vehicle exhaust three unique catalytic converter partly consists of three-way catalyst, liner, shell etc., and what wherein play catalytic purification effect is three-way catalyst.Along with the further raising of emission standard, catalyzer need to increase carrier number and further near engine, improve temperature of reaction (250-400 ℃).Therefore originally the liner that only plays fixing, buffering and insulation effect produces larger pressure to thin-walled in the situation that of heating, causes the serious consequence of fragmentation or inefficacy.The material of making at present liner has metal, glass fibre or aluminum silicate fiber, and according to the difference of material character, the liner of ternary catalyzing unit can be divided into expansion and unexpansive two classes.
In traditional inflated insert, contain vermiculite, this is a kind of silicate of laminate structure.Vermiculite is because peel off like worm and gain the name being heated to after 200-300 ℃ to produce along the C axle of crystal, and this mineral have very high coefficient of thermal expansion, the tens times of left and right of can expanding when being heated to 300 ℃ of left and right, and bend.And mullite fiber is as a kind of ceramic fiber of novel alumina base, under high-temperature oxidation environment, there is high refractoriness, low thermal coefficient of expansion and the advantage such as anti-oxidant, its its modulus in more than 1400 ℃ use temperatures still can reach 200-300GPa simultaneously, just in our needed novel blankets work scope.But domestic mullite fiber exists the problem of the short and efflorescence of fiber, have a strong impact on the working environment of workers and healthy and cause the decline of forming quality of products and effect of heat insulation.Common problem in the face of industry, Ningbo Material Technology and Engineering Inst. of Chinese Academy of Sciences structure and function integration pottery team have proposed microwave method and have prepared mullite fiber (CN201210065441.0), the application of microwave method has reduced thermal treatment temp, shortened soaking time, significantly promote production efficiency, and reduced fiber weakness fracture Pulverization ratio.This patent has related to the manufacturing of mullite fiber, needs scale production raw material, extensively universal not yet in industry.
summary of the invention
The object of the invention is to overcome the deficiency that prior art exists, and the mullite liner skin and the preparation method that provide a kind of auto-exhaust catalyst that can realize anti-efflorescence object to use.
In order to realize above-mentioned object, the present invention has adopted following technical scheme: the mullite liner that described auto-exhaust catalyst is used is outer, it is following component, to consist of by weight percentage: modification mullite fiber 60-85 %, Calcined polishing aluminum oxide micro mist 5-10%, silicon sol 3-10%, clorox 1.2-3.8%, starch 2.7-7.3%, additive 0.5-1.5%, above-mentioned component sum is 100%; The chemical composition of described modification mullite fiber is Al
2o
3>=70%, SiO
2≤ 25%, oily matter > 1.5%, above-mentioned chemical composition sum is weight 100%.
Described modification mullite fiber obtains by following steps:
(1) unmodified fibers is mixed with silane coupling agent;
(2) said mixture being put into water infiltrates;
(3) with epoxy resin etc., carry out graft reaction;
(4) be washed to the then dry modification mullite fiber that obtains of neutrality.
In above-mentioned step (1), silane coupling agent is KH550 and KH570;
In above-mentioned step (2), infiltration need to be gained in weight the glycerine of 5-10% as lubricant.
Calcined polishing aluminum oxide micro mist of the present invention, its maximum particle diameter≤10mm; In described silicon sol, the particle diameter of silicon-dioxide is 200nm-500 nm, pH value 3-5; Described additive is methylcellulose gum, and described oily matter is epoxy resin.
The outer field preparation method of mullite liner that auto-exhaust catalyst is used as mentioned above, it comprises the steps:
A) by proportioning, take each raw material, mix, through the mixing slurry that obtains;
B) then suction filtration moulding, at 190-210 ℃ of temperature, dry 10 h obtain finished product.
Described end properties index has: reheating linear shrinkage ratio < 1.5, linear expansivity≤8x10
-6/ ℃, thermal conductivity is from 0.10-0.23w/mk, tensile strength>=0.35MPa, and unit weight is from 200-260kg/m
3, refractoriness > 1800,1500 ℃ of maximum operation (service) temperature >, and staple length maintains 5-9 um.
The present invention is the refractory materials knowhow based on long-term, in the situation that staying out of mullite fiber production, has redesigned the structure of liner, is divided into layer of fibers as skin and ZrO
2ceramic layer, as novel a kind of auto-exhaust catalyst mullite liner of internal layer, reaches the efflorescence that stops liner, optimization production environment, the object of reduction dust pollution.
Interior other mullite fiber goods of the same trade are just simply smeared one deck silicon sol and are compared on surface, this liner skin utilizes modification mullite fiber as main raw material, by above-mentioned steps, in the situation that overcoming efflorescence, guaranteed the excellent fire resistance energy of goods.
embodiment
Below in conjunction with specific embodiment, the present invention will be described in detail: the mullite liner that auto-exhaust catalyst of the present invention is used is outer, it is following component, to consist of by weight percentage: modification mullite fiber 60-85 %, Calcined polishing aluminum oxide micro mist 5-10%, silicon sol 3-10%, clorox 1.2-3.8%, starch 2.7-7.3%, additive 0.5-1.5%, above-mentioned component sum is 100%; The chemical composition of described modification mullite fiber is Al
2o
3>=70%, SiO
2≤ 25%, oily matter > 1.5%, above-mentioned chemical composition sum is weight 100%.
Described modification mullite fiber obtains by following steps:
(1) unmodified fibers is mixed with silane coupling agent;
(2) said mixture being put into water infiltrates;
(3) with epoxy resin etc., carry out graft reaction;
(4) be washed to the then dry modification mullite fiber that obtains of neutrality.
In above-mentioned step (1), silane coupling agent is KH550 and KH570;
In above-mentioned step (2), infiltration need to be gained in weight the glycerine of 5-10% as lubricant.
Calcined polishing aluminum oxide micro mist of the present invention, its maximum particle diameter≤10mm; In described silicon sol, the particle diameter of silicon-dioxide is 200nm-500 nm, pH value 3-5; Described additive is methylcellulose gum, and described oily matter is epoxy resin.
The outer field preparation method of mullite liner that auto-exhaust catalyst is used as mentioned above, this preparation method comprises the steps:
A) by proportioning, take each raw material, mix, through the mixing slurry that obtains;
B) then suction filtration moulding, at 190-210 ℃ of temperature, dry 10 h obtain finished product.
Described end properties index is by reheating linear shrinkage ratio < 1.5, linear expansivity≤8x10
-6/ ℃, thermal conductivity is from 0.10-0.23w/mk, tensile strength>=0.35MPa, and unit weight is from 200-260kg/m
3, refractoriness > 1800,1500 ℃ of maximum operation (service) temperature >, and staple length maintains 5-9 um.
Embodiment of the present invention is not limited to following three kinds, and the numerous technical scheme that the simple replacement of the replacement of every any numerical value carrying out on the basis of technique scheme or prior art obtains is embodiments of the invention.
Embodiment 1: the Silane coupling agent KH550 of 100 parts of mullite fibers and 0.5 part is placed in to industrial mixer, the water that adds 120 parts, add the 5wt% glycerine of 5 parts, per minute 100 turned low rate mixing mixed solution upper strata after 2 hours, added appropriate boiling water, regulated water temperature to 40 ℃, then add 10 parts of epoxy resin, add ammoniacal liquor, regulate pH value to 5, per minute 500 turns middling speed stirring 4 hours simultaneously.Then add tap water and rinse, until neutral, filter, be placed in 80 ℃ of oven dry in baking oven.Before and after modification, detecting analytical results shows: 72.43wt% Al in the mullite fiber after modification
2o
3, 25.96%wt SiO
2, oily matter 1.52 wt %; Staple length is 8-10 um.
The outer field formula of liner is modification mullite fiber 60 wt %, Calcined polishing aluminum oxide micro mist 20 wt %, silicon sol 10 wt %, clorox 1.2 wt %, starch 7.3 wt %, methylcellulose gum 1.5 wt %.Mix, through the mixing slurry that obtains, then suction filtration moulding, dry 10 h at 210 ℃.The outer reheating linear shrinkage ratio 0.5 of this liner, linear expansivity 8x10
-6/ ℃, thermal conductivity is from 0.23w/mk, tensile strength 0.41MPa, and unit weight is from 260kg/m
3, refractoriness 1880,1700 ℃ of maximum operation (service) temperatures, staple length maintains 5-9 um.
Embodiment 2: the silane coupling agent KH560 of 100 parts of mullite fibers and 1 part is placed in to industrial mixer, the water that adds 120 parts, add the 5wt% glycerine of 10 parts, per minute 100 turned low rate mixing mixed solution upper strata after 2 hours, added appropriate boiling water, regulated water temperature to 60 ℃, then add 10 parts of epoxy resin, add ammoniacal liquor, regulate pH value to 6, per minute 500 turns middling speed stirring 4 hours simultaneously.Then add tap water and rinse, until neutral, filter, be placed in 90 ℃ of oven dry in baking oven.Before and after modification, detecting analytical results shows: 70.12 wt % Al in the mullite fiber after modification
2o
3, 24.14 wt % SiO
2, oily matter 5.74 wt %; Staple length is 8-12 um.
The outer field formula of liner is modification mullite fiber 85%, Calcined polishing aluminum oxide micro mist 5%, silicon sol 3%, clorox 3.8%, starch 2.7%, methylcellulose gum 0.5%.Mix, through the mixing slurry that obtains, then suction filtration moulding, dry 10 h at 190 ℃.The outer reheating linear shrinkage ratio 1.0 of this liner, linear expansivity 5x10
-6/ ℃, thermal conductivity is from 0.10w/mk, tensile strength 0.35MPa, and unit weight is from 200kg/m
3, refractoriness 1620,1500 ℃ of maximum operation (service) temperatures, staple length maintains 8-11 um.
Embodiment 3: 100 parts of mullite fibers and each silane coupling agent KH560 and the KH550 of 1 part are placed in to industrial mixer, the water that adds 120 parts, add the 5wt% glycerine of 8 parts, per minute 100 turned low rate mixing mixed solution upper strata after 2 hours, added appropriate boiling water, regulated water temperature to 60 ℃, then add 10 parts of epoxy resin, add ammoniacal liquor, regulate pH value to 5, per minute 500 turns middling speed stirring 4 hours simultaneously.Then add tap water and rinse, until neutral, filter, be placed in 60 ℃ of oven dry in baking oven.Before and after modification, detecting analytical results shows: 71.27 wt %Al in the mullite fiber after modification
2o3,23.84 wt % SiO
2, oily matter 4.89 wt %; Staple length is 8-12 um.
The outer field formula of liner is modification mullite fiber 75 wt %, Calcined polishing aluminum oxide micro mist 8 wt %, silicon sol 7.2 wt %, clorox 2.6 wt %, starch 6 wt %, methylcellulose gum 1.2 wt %.Mix, through the mixing slurry that obtains, then suction filtration moulding, dry 10 h at 200 ℃.The outer reheating linear shrinkage ratio 0.8 of this liner, linear expansivity 6x10
-6/ ℃, thermal conductivity is from 0.18w/mk, tensile strength 0.37MPa, and unit weight is from 240kg/m
3, refractoriness 1750,1700 ℃ of maximum operation (service) temperatures, staple length maintains 6-11 um.
Claims (6)
1. the mullite liner that an auto-exhaust catalyst is used is outer, it is characterized in that described mullite liner skin consists of following component by weight percentage: modification mullite fiber 60-85 %, Calcined polishing aluminum oxide micro mist 5-10%, silicon sol 3-10%, clorox 1.2-3.8%, starch 2.7-7.3%, additive 0.5-1.5%, above-mentioned component sum is 100%; The chemical composition of described modification mullite fiber is Al
2o
3>=70%, SiO
2≤ 25%, oily matter > 1.5%, above-mentioned chemical composition sum is weight 100%.
2. the mullite liner that auto-exhaust catalyst according to claim 1 is used is outer, it is characterized in that described modification mullite fiber obtains by following steps:
(1) unmodified fibers is mixed with silane coupling agent;
(2) said mixture being put into water infiltrates;
(3) with epoxy resin etc., carry out graft reaction;
(4) be washed to the then dry modification mullite fiber that obtains of neutrality.
3. the mullite liner that auto-exhaust catalyst according to claim 2 is used is outer, it is characterized in that in described step (1), silane coupling agent is KH550 and KH570;
In described step (2), infiltration need to be gained in weight the glycerine of 5-10% as lubricant.
4. the mullite liner that auto-exhaust catalyst according to claim 1 is used is outer, it is characterized in that described Calcined polishing aluminum oxide micro mist, its maximum particle diameter≤10mm; In described silicon sol, the particle diameter of silicon-dioxide is 200nm-500 nm, pH value 3-5; Described additive is methylcellulose gum, and described oily matter is epoxy resin.
5. the outer field preparation method of mullite liner that auto-exhaust catalyst is used as claimed in claim 1 or 2 or 3 or 4, is characterized in that described preparation method comprises the steps:
A) by proportioning, take each raw material, mix, through the mixing slurry that obtains;
B) then suction filtration moulding, at 190-210 ℃ of temperature, dry 10 h obtain finished product.
6. the outer field preparation method of mullite liner that auto-exhaust catalyst according to claim 1 is used, is characterized in that described end properties index is by reheating linear shrinkage ratio < 1.5, linear expansivity≤8x10
-6/ ℃, thermal conductivity is from 0.10-0.23w/mk, tensile strength>=0.35MPa, and unit weight is from 200-260kg/m
3, refractoriness > 1800,1500 ℃ of maximum operation (service) temperature >, and staple length maintains 5-9 um.
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| CN201410177556.8A CN103979916B (en) | 2014-04-30 | 2014-04-30 | A kind of mullite liner skin of auto-exhaust catalyst and preparation method |
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|---|---|---|---|
| CN201410177556.8A CN103979916B (en) | 2014-04-30 | 2014-04-30 | A kind of mullite liner skin of auto-exhaust catalyst and preparation method |
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| CN103979916B CN103979916B (en) | 2016-02-10 |
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Cited By (5)
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| CN106498752A (en) * | 2016-11-10 | 2017-03-15 | 无锡市明盛强力风机有限公司 | A kind of material modified method of modifying of ternary catalyzing unit liner |
| CN107282871A (en) * | 2017-08-21 | 2017-10-24 | 马鞍山市三川机械制造有限公司 | A kind of Automobile flywheel shell cast paint |
| CN107442741A (en) * | 2017-08-21 | 2017-12-08 | 马鞍山市三川机械制造有限公司 | A kind of preparation method of high-quality cast paint |
| CN108341680A (en) * | 2015-01-22 | 2018-07-31 | 河南省西峡开元冶金材料有限公司 | The production method of ceramic fibre, the processing method of ceramic fibre and ceramic fiber mat |
| 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 |
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| CN101698592A (en) * | 2009-11-13 | 2010-04-28 | 航天特种材料及工艺技术研究所 | Silicon-aluminium aerogel composite material and manufacturing method thereof |
| CN103508750A (en) * | 2013-06-07 | 2014-01-15 | 湖北神雾热能技术有限公司 | Production method of non-polluting low-cost honeycomb ceramic |
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| US20090084268A1 (en) * | 2007-09-28 | 2009-04-02 | Ibiden Co., Ltd. | Mat member, method of fabricating mat member, exhaust gas treating apparatus, and silencing device |
| CN101428216A (en) * | 2007-11-07 | 2009-05-13 | 中国石油化工股份有限公司 | Layered composite carrier for producing shell shaped catalyst |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108341680A (en) * | 2015-01-22 | 2018-07-31 | 河南省西峡开元冶金材料有限公司 | The production method of ceramic fibre, the processing method of ceramic fibre and ceramic fiber mat |
| CN108341680B (en) * | 2015-01-22 | 2021-06-22 | 河南省西峡开元冶金材料有限公司 | Ceramic fiber, method for treating ceramic fiber, and method for producing ceramic fiber mat |
| CN106498752A (en) * | 2016-11-10 | 2017-03-15 | 无锡市明盛强力风机有限公司 | A kind of material modified method of modifying of ternary catalyzing unit liner |
| CN107282871A (en) * | 2017-08-21 | 2017-10-24 | 马鞍山市三川机械制造有限公司 | A kind of Automobile flywheel shell cast paint |
| CN107442741A (en) * | 2017-08-21 | 2017-12-08 | 马鞍山市三川机械制造有限公司 | A kind of preparation method of high-quality cast paint |
| 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 |
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| CN103979916B (en) | 2016-02-10 |
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Denomination of invention: A mullite liner outer layer for automobile exhaust catalyst and its preparation method Effective date of registration: 20220712 Granted publication date: 20160210 Pledgee: Nanxun Zhejiang rural commercial bank Limited by Share Ltd. old branch branch Pledgor: Huzhou Nanxun old museum Jinan Engineering Construction Co.,Ltd. Registration number: Y2022330001341 |
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