CN103979916B - A kind of mullite liner skin of auto-exhaust catalyst and preparation method - Google Patents
A kind of mullite liner skin of auto-exhaust catalyst and preparation method Download PDFInfo
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- CN103979916B CN103979916B CN201410177556.8A CN201410177556A CN103979916B CN 103979916 B CN103979916 B CN 103979916B CN 201410177556 A CN201410177556 A CN 201410177556A CN 103979916 B CN103979916 B CN 103979916B
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Abstract
A kind of mullite liner skin of auto-exhaust catalyst and preparation method, described mullite liner skin is made up 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 100% of weight; Described preparation method is: a) take each raw material by proportioning, mix, and obtains slurry through mixing; B) then suction filtration is shaping, and at 190-210 DEG C of temperature, dry 10h obtains finished product; The present invention utilizes modification mullite fiber as main raw material, and it is when overcoming efflorescence, ensure that the excellent fire resistance energy of goods.
Description
Technical field
The present invention relates to a kind of mullite liner skin and preparation method of auto-exhaust catalyst, belong to fire-resistant heat insulating material technical field.
Background technology
Along with China Auto Market, both production and marketing thrive, along with and come be huge environmental protection pressure and the thriving demand of 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 one of effectively measures solving automobile exhaust pollution.Usual vehicle exhaust three unique catalytic converter is made up of parts such as three-way catalyst, liner, shells, and what wherein play catalytic purification effect is three-way catalyst.Along with the further raising of emission standard, catalyzer needs increase carrier number and improve temperature of reaction (250-400 DEG C) near engine further.Therefore originally only play the liner of fixing, buffering and insulation effect, in case of heating larger pressure is produced to thin-walled, cause the serious consequence of fragmentation or inefficacy.The material of current making 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.
Containing vermiculite in traditional inflated insert, this is a kind of silicate of laminate structure.Vermiculite peels off like worm because can produce along the C axle of crystal after being heated to 200-300 DEG C and gains the name, and this mineral have very high coefficient of thermal expansion, can expand about tens times when being heated to about 300 DEG C, and bend.And mullite fiber is as a kind of novel oxidized aluminium base ceramic fiber, under high-temperature oxidation environment, there is high refractoriness, low thermal coefficient of expansion and the advantage such as anti-oxidant, simultaneously in its use temperature more than 1400 DEG C, its modulus still can reach 200-300GPa, is just in the novel blankets work scope required for us.But domestic mullite fiber also 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.In the face of the common problem of industry, structure and fuction integrated ceramic team of Ningbo Material Technology and Engineering Inst. of the Chinese Academy of Sciences proposes microwave method and has prepared mullite fiber (CN201210065441.0), the application of microwave method reduces thermal treatment temp, shorten soaking time, significantly improve production efficiency, and reduce fiber weakness fracture Pulverization ratio.This patent has related to the manufacturing of mullite fiber, needs scale production raw material, not yet in industry extensively popularizes.
Summary of the invention
The object of the invention is to the deficiency overcoming prior art existence, and a kind of mullite liner skin and the preparation method that can realize the auto-exhaust catalyst of anti-powdering object are provided.
In order to realize above-mentioned object, present invention employs following technical scheme: the mullite liner of described auto-exhaust catalyst is outer, it is made up 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 100% of weight.
Described modification mullite fiber is obtained by following steps:
(1) unmodified fibers mixes with silane coupling agent;
(2) said mixture is put into water to infiltrate;
(3) graft reaction is carried out with epoxy resin etc.;
(4) be washed to neutrality then drying obtain modification mullite fiber.
In above-mentioned step (1), silane coupling agent is KH550 and KH570;
In above-mentioned step (2), infiltrate the glycerine of the 5-10% that needs to gain in weight 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-500nm, pH value 3-5; Described additive is methylcellulose gum, and described oily matter is epoxy resin.
The outer field preparation method of mullite liner of auto-exhaust catalyst described above, it comprises the steps:
A) take each raw material by proportioning, mix, obtain slurry through mixing;
B) then suction filtration is shaping, and at 190-210 DEG C of temperature, dry 10h obtains finished product.
Described end properties index has: reheating linear shrinkage ratio < 1.5, linear expansivity≤8x10
-6/ DEG C, thermal conductivity is from 0.10-0.23w/mk, and tensile strength>=0.35MPa, unit weight is from 200-260kg/m
3, refractoriness > 1800, maximum operation (service) temperature > 1500 DEG C, staple length maintains 5-9um.
The present invention is based on long-term refractory materials knowhow, when staying out of mullite fiber and producing, has redesigned the structure of liner, is divided into layer of fibers as outer and ZrO
2ceramic layer, as novel a kind of auto-exhaust catalyst mullite liner of internal layer, reaches the efflorescence stoping liner, optimization production environment, reduces the object of dust pollution.
In of the same trade, other mullite fiber goods are simply to compare at surface smear one deck silicon sol, this liner skin utilizes modification mullite fiber as main raw material, by above-mentioned steps, when overcoming efflorescence, ensure that 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 of auto-exhaust catalyst of the present invention is outer, it is made up 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 100% of weight.
Described modification mullite fiber is obtained by following steps:
(1) unmodified fibers mixes with silane coupling agent;
(2) said mixture is put into water to infiltrate;
(3) graft reaction is carried out with epoxy resin etc.;
(4) be washed to neutrality then drying obtain modification mullite fiber.
In above-mentioned step (1), silane coupling agent is KH550 and KH570;
In above-mentioned step (2), infiltrate the glycerine of the 5-10% that needs to gain in weight 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-500nm, pH value 3-5; Described additive is methylcellulose gum, and described oily matter is epoxy resin.
The outer field preparation method of mullite liner of auto-exhaust catalyst described above, this preparation method comprises the steps:
A) take each raw material by proportioning, mix, obtain slurry through mixing;
B) then suction filtration is shaping, and at 190-210 DEG C of temperature, dry 10h obtains finished product.
Described end properties index is by reheating linear shrinkage ratio < 1.5, linear expansivity≤8x10
-6/ DEG C, thermal conductivity is from 0.10-0.23w/mk, and tensile strength>=0.35MPa, unit weight is from 200-260kg/m
3, refractoriness > 1800, maximum operation (service) temperature > 1500 DEG C, staple length maintains 5-9um.
Embodiment of the present invention is not limited to following three kinds, and the numerous technical scheme that every replacement of any numerical value carried out on the basis of technique scheme or the simple replacement of prior art obtain 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 industrial mixer, add the water of 120 parts, add the 5wt% glycerine of 5 parts, per minute 100 turns of low rate mixing mixed solution upper stratas, after 2 hours, add appropriate boiling water, regulate water temperature to 40 DEG C, then 10 parts of epoxy resin are added, add ammoniacal liquor, adjust ph to 5, simultaneously per minute 500 turns of moderate-speed mixer 4 hours.Then add tap water, until neutral, filter, be placed in 80 DEG C of oven dry in baking oven.Detect analytical results before modified afterwards to show: 72.43wt%Al in modified mullite fiber
2o
3, 25.96%wtSiO
2, oily matter 1.52wt%; Staple length is 8-10um.
The outer field formula of liner is modification mullite fiber 60wt%, Calcined polishing aluminum oxide micro mist 20wt%, silicon sol 10wt%, clorox 1.2wt%, starch 7.3wt%, methylcellulose gum 1.5wt%.Mix, obtain slurry through mixing, then suction filtration is shaping, dry 10h at 210 DEG C.The outer reheating linear shrinkage ratio 0.5, linear expansivity 8x10 of this liner
-6/ DEG C, thermal conductivity is from 0.23w/mk, and tensile strength 0.41MPa, unit weight is from 260kg/m
3, refractoriness 1880, maximum operation (service) temperature 1700 DEG C, staple length maintains 5-9um.
Embodiment 2: the silane coupling agent KH560 of 100 parts of mullite fibers and 1 part is placed in industrial mixer, add the water of 120 parts, add the 5wt% glycerine of 10 parts, per minute 100 turns of low rate mixing mixed solution upper stratas, after 2 hours, add appropriate boiling water, regulate water temperature to 60 DEG C, then 10 parts of epoxy resin are added, add ammoniacal liquor, adjust ph to 6, simultaneously per minute 500 turns of moderate-speed mixer 4 hours.Then add tap water, until neutral, filter, be placed in 90 DEG C of oven dry in baking oven.Detect analytical results before modified afterwards to show: 70.12wt%Al in modified mullite fiber
2o
3, 24.14wt%SiO
2, oily matter 5.74wt%; Staple length is 8-12um.
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, obtain slurry through mixing, then suction filtration is shaping, dry 10h at 190 DEG C.The outer reheating linear shrinkage ratio 1.0, linear expansivity 5x10 of this liner
-6/ DEG C, thermal conductivity is from 0.10w/mk, and tensile strength 0.35MPa, unit weight is from 200kg/m
3, refractoriness 1620, maximum operation (service) temperature 1500 DEG C, staple length maintains 8-11um.
Embodiment 3: silane coupling agent KH560 and KH550 of 100 parts of mullite fibers and each 1 part is placed in industrial mixer, add the water of 120 parts, add the 5wt% glycerine of 8 parts, per minute 100 turns of low rate mixing mixed solution upper stratas, after 2 hours, add appropriate boiling water, regulate water temperature to 60 DEG C, then 10 parts of epoxy resin are added, add ammoniacal liquor, adjust ph to 5, simultaneously per minute 500 turns of moderate-speed mixer 4 hours.Then add tap water, until neutral, filter, be placed in 60 DEG C of oven dry in baking oven.Detect analytical results before modified afterwards to show: 71.27wt%Al in modified mullite fiber
2o3,23.84wt%SiO
2, oily matter 4.89wt%; Staple length is 8-12um.
The outer field formula of liner is modification mullite fiber 75wt%, Calcined polishing aluminum oxide micro mist 8wt%, silicon sol 7.2wt%, clorox 2.6wt%, starch 6wt%, methylcellulose gum 1.2wt%.Mix, obtain slurry through mixing, then suction filtration is shaping, dry 10h at 200 DEG C.The outer reheating linear shrinkage ratio 0.8, linear expansivity 6x10 of this liner
-6/ DEG C, thermal conductivity is from 0.18w/mk, and tensile strength 0.37MPa, unit weight is from 240kg/m
3, refractoriness 1750, maximum operation (service) temperature 1700 DEG C, staple length maintains 6-11um.
Claims (5)
1. the mullite liner of an auto-exhaust catalyst is outer, it is characterized in that described mullite liner skin is made up 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 100% of weight; Described oily matter is epoxy resin;
Described modification mullite fiber is obtained by following steps:
(1) unmodified fibers mixes with silane coupling agent;
(2) said mixture is put into water to infiltrate;
(3) graft reaction is carried out with epoxy resin;
(4) be washed to neutrality then drying obtain modification mullite fiber.
2. the mullite liner of auto-exhaust catalyst according to claim 1 is outer, it is characterized in that in described step (1), silane coupling agent is KH550 and KH570;
In described step (2), infiltrate the glycerine of the 5-10% that needs to gain in weight as lubricant.
3. the mullite liner of auto-exhaust catalyst according to claim 1 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-500nm, pH value 3-5; Described additive is methylcellulose gum, and described oily matter is epoxy resin.
4. the outer field preparation method of mullite liner of auto-exhaust catalyst as described in claim 1 or 2 or 3, is characterized in that described preparation method comprises the steps:
A) take each raw material by proportioning, mix, obtain slurry through mixing;
B) then suction filtration is shaping, and at 190-210 DEG C of temperature, dry 10h obtains finished product.
5. the outer field preparation method of mullite liner of auto-exhaust catalyst according to claim 4, is characterized in that described end properties index is by reheating linear shrinkage ratio < 1.5, linear expansivity≤8x10
-6/ DEG C, thermal conductivity 0.10-0.23W/mk, tensile strength>=0.35MPa, unit weight 200-260Kg/m
3, refractoriness > 1800 DEG C, maximum operation (service) temperature > 1500 DEG C, staple length maintains 5-9 μm.
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| 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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| 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 |
| 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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| JP2009085093A (en) * | 2007-09-28 | 2009-04-23 | Ibiden Co Ltd | Mat member, method for manufacturing mat member, exhaust gas treatment apparatus and muffler |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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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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