CN102921237B - Process for manufacturing high-filtering, high-temperature-resistant and anti-corrosive membrane-covered hybrid fiber punched felt - Google Patents
Process for manufacturing high-filtering, high-temperature-resistant and anti-corrosive membrane-covered hybrid fiber punched felt Download PDFInfo
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- CN102921237B CN102921237B CN201210443627.5A CN201210443627A CN102921237B CN 102921237 B CN102921237 B CN 102921237B CN 201210443627 A CN201210443627 A CN 201210443627A CN 102921237 B CN102921237 B CN 102921237B
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Abstract
The invention relates to a process for manufacturing high-filtering, high-temperature-resistant and anti-corrosive membrane-covered hybrid fiber punched felt. The process comprises the steps of subjecting plain felt of the hybrid fiber punched felt to anti-corrosion treatment through a surface treating agent containing a rear earth surface modification agent, and conducting hot-pressing combination on the plain felt and a polyfluortetraethylene microporous membrane to produce the hybrid fiber punched felt, wherein the surface treating agent comprises, by weight, 10-35% of a polyfluortetraethylene emulsion, 5-20% of a polyacrylic ester emulsion, 0.05-5% of the rear earth surface modification agent and the balance water, and the anti-corrosion treatment comprises the steps of dipping the plain felt of the hybrid fiber punched felt in the surface treating agent, baking at the temperature in a range of 100-250 DEG C for 2-10min in advance, then baking at the temperature in a range of 180-250 DEG C for 2-15min, and obtaining the hybrid fiber punched felt. The hybrid fiber punched felt is resistant to high temperature, good in corrosion resistance, high in filtering efficiency and high in folding resistance, and the service life is greatly prolonged.
Description
Technical field
The manufacture method that the present invention relates to a kind of high filtration, high temperature resistant, anticorrosive overlay film assorted fibre Nomex, belongs to filtering material field.
Background technology
At present, both at home and abroad traditional Nomex filtrate adopts nonwoven needled technique and complex technique, is three-dimensional staggered structure more, and that can give full play to fiber catches dirt function, catches dirt effect stability; Nomex does not have or only has on a small quantity the filling yarn of (have base cloth person) twisting, and its hole is little and porosity is large, is evenly distributed, and overall porosity reaches 70～80%, for generally weaving 1.6～2 times of filtrate, thereby the good permeability of self, resistance is low.But general acupuncture felt filter material is often not fully up to expectations for the filter efficiency of ultrafine dust.In addition, because the dust filtering is with static, causes dust to be condensed in Nomex surface and stop up hole, having affected the filter efficiency of Nomex.
Summary of the invention
The manufacture method that the object of this invention is to provide a kind of high filtration, high temperature resistant, anticorrosive overlay film assorted fibre Nomex, to solve the problems such as filter effect that existing filtering material exists is in actual use undesirable, high temperature resistant, anticorrosive.Assorted fibre Nomex of the present invention can bear the high temperature of 260 ℃
The present invention be by assorted fibre Nomex element felt after the surface conditioning agent processing containing RE surface modifying agent, form by hot pressing cladding with microporous teflon membran; Aforementioned surfaces inorganic agent, formulated by weight by following component:
Ptfe emulsion 10～35%, polyacrylate dispersion 5～20%, RE surface modifying agent 0.05～5%, surplus are water;
Aforementioned processing is performed such: assorted fibre Nomex element felt after surface conditioning agent dipping, preliminary drying 2～10min at 100～250 ℃, then bake 2～15min at 180～250 ℃, the assorted fibre Nomex after being processed.
Above-mentioned assorted fibre Nomex element felt is that the two sides that the two-layer assorted fibre layer being mixed by polyimides short fiber, PTFE short fiber and glass chopped silk is overlying on respectively to base cloth by pre-needling and main acupuncture forms.Specifically by pre-needling, fibrage is tentatively connected with base cloth, then by main acupuncture by its combination securely, make assorted fibre Nomex element felt.Wherein in assorted fibre layer, the weight content of various fibers is:
Polyimide fiber: 5 ~ 30%
PTFE fiber: 40 ~ 90%
Glass fibre: 5 ~ 30%
Above-mentioned base cloth is glass fibre base cloth, PTFE base cloth or a kind of in the base cloth of glass fibre and PTFE fiber blend.
The compound method of the above-mentioned surface conditioning agent containing RE surface modifying agent is: by weight mixture, add water constantly to stir ptfe emulsion, polyacrylate dispersion, RE surface modifying agent, obtain surface conditioning agent after liquid stabilising.
In above-mentioned each component, ptfe emulsion can improve chemical resistance, folding resistance, hydrophobicity and the service life of Nomex, preferably self-cross linking type modified polyacrylate emulsion; Polyacrylate dispersion can make the high resilience of glass filtering material soft smooth, improves its folding, anti-wear performance; With RE surface modifying agent, be used as coupling agent, coupling agent can be divided into Organic Chromium complex compound, silanes, titanate ester and the large class of aluminic acid compound four by chemical constitution and composition, compare with above-mentioned conventional coupling agent, rare earth has special 4f layer structure and the less characteristic of electronegativity, makes it have outstanding chemism.As the rare earth element of surface active element, when surface treatment, be first adsorbed on fiber surface, system capacity is reduced.After absorption, a part of rare earth element is because its electronegativity value is low, and it is by the oxygen of capturing in fiberglass surfacing hydroxyl, and the main component of glass is SiO
2with metal oxide, and at glass surface SiO
2, Al
2o
3content relatively many, thereby improve the interface binding power between glass fibre and matrix.The 4f duplet atomic nucleus bad sealing of rare earth atom, shows larger effective nuclear charge.Electronics to atom around it has stronger attraction.At rare earth element and PTFE interface, the formed RE-F key of rare earth element or RE-C key have stronger ion key.Simultaneously, the rare earth compound that is present in interface, played the effect that is similar to " pinning ", mechanical adhesion between reinforced glass fiber and PTFE, further improved the compatibility between glass fibre and PTFE matrix, therefore RE surface modifying agent has higher heat resistance, and is better than conventional coupling agent for the improvement of glass and PTFE binding ability, so the present invention selects RE surface modifying agent as coupling agent.
The RE surface modifying agent that can adopt in the present invention can be the oxide of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium etc. or the mixture of one or more arbitrary proportions in compound (as rare earth-iron-boron, rare earth nitrades etc.).
The mechanism of above-mentioned corrosion-resistant treatments is:
(1) after treated dose of dipping of assorted fibre Nomex element felt, surface forms one with the mixed uniformly emulsion film of granule form, the coupling agent molecule in carpet veneer surface attachment inorganic agent;
(2), in body of heater, because the evaporation of moisture causes the emulsion film attenuation gradually on assorted fibre felt surface, granule precipitates gradually, on the surface of assorted fibre felt, has formed one deck macromolecule membrane;
(3) under the effect of high temperature; moisture further evaporates; between rare-earth modifier and carpet veneer surface, there is physical-chemical reaction; form chemical bonds, improve fiber surface performance, and rare-earth modifier reacts with organic components granule; generate chemical crosslinking; granule deposit buildup, between granule, melting mutually, forms complete uniform polymer protective film.
Above-mentioned microporous teflon membran is prepared from by weight by following component:
PTFE micro mist: 60～85%, lubricant: 15～40%.
PTFE microporous barrier adopts following conventional technological process preparation, and its aperture is generally between 0.02 μ m～3 μ m, and minimum-value aperture can reach 0.02 μ m:
Mixing → the base of PTFE micro mist, lubricant → push → roll → indulge drawing → horizontal drawing → PTFE microporous barrier.
Above-mentioned hot pressing cladding is to utilize laminating machine, by the compound spiked felt of handling well and the synchronous operation of polytetrafluoroethylene (PTFE) microporous barrier, at hot-pressing roller place, by certain pressure and temperature condition, both is covered to pressure.PTFE microporous barrier at high temperature with the polymer protective film generation melting on assorted fibre felt surface, molecule shifts mutually, thereby makes PTFE microporous barrier firmly be attached to assorted fibre felt surface.Temperature during hot pressing cladding is 280～360 ℃, and pressure is 0.1～2.0MPa.
High temperature resistant (can bear the high temperature of 260 ℃) of the present invention, corrosion resistance are good, and filter efficiency is high, and folding resistance is strong, has obtained larger prolongation service life.
The specific embodiment
Below in conjunction with instantiation, the invention will be further described.
In the chopped strand layer of assorted fibre Nomex element felt, the composition of each fiber is as shown in table 1 by weight ratio:
The part by weight (%) of each fiber in table 1 assorted fibre felt
| Embodiment sequence number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| PTFE fiber | 90 | 85 | 80 | 75 | 65 | 60 | 50 | 40 |
| Polyimide fiber | 5 | 10 | 5 | 15 | 20 | 20 | 25 | 30 |
| Glass fibre | 5 | 5 | 20 | 10 | 15 | 20 | 25 | 30 |
The manufacturing step of assorted fibre Nomex element felt is: in different ratios, take various fibers, the chopped strand preparing is evenly sprinkled into bale opener.After mixing, pre-opener shredding sends into large storehouse blending box (for the present invention and production firm develop jointly, top gas string formula vast capacity blending box).Through the further shredding of refined opener, mix and deliver to the gas feeding hopper that shakes again.By the gas hopper that shakes, by mixing fibrage, feed uniformly corresponding carding machine.Carding machine by the abundant combing of fiber, be mixed into ultimate fibre shape, through condensing after mixed and disorderly, form web, then through lapping machine respectively laying become the fibrage of certain thickness (or grammes per square metre).In two fibrages, place base cloth, through feeding machine, import pre-needling machine pre-needling, then through upper and lower main acupuncture, the needing machine of having a shave to carpet veneer two sides acupuncture winding shaping, make assorted fibre acupuncture element felt.
The formula that table 2-8 are surface conditioning agent of the present invention is enumerated.Wherein PTFE represents ptfe emulsion, and solid content is 60%; PA represents polyacrylate dispersion, the selected self-cross linking type modified polyacrylate emulsion of embodiment (manufacturer is Dow Chemical company, trade mark R-834); Rare earth in RE surface modifying agent can be lanthanum, cerium, praseodymium, etc. oxide or one or more combinations in any proportion in compound (as rare earth-iron-boron, rare earth nitrades etc.).
The formula one of table 2 surface conditioning agent
| Sequence number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| PTFE | 10 | 15 | 20 | 10 | 15 | 20 | 10 | 30 | 35 |
| PA | 15 | 10 | 5 | 10 | 5 | 15 | 5 | 10 | 20 |
| Lanthana | 0.05 | 0.1 | 0.2 | 1.5 | 0.2 | 3 | 0.5 | 4 | 5 |
| Water | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus |
The formula two of table 3 surface conditioning agent
| Sequence number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| PTFE | 10 | 15 | 20 | 10 | 15 | 20 | 10 | 30 | 35 |
| PA | 15 | 10 | 5 | 10 | 5 | 15 | 20 | 10 | 15 |
| Cerium oxide | 0.05 | 1.5 | 0.5 | 1.5 | 0.2 | 0.3 | 5 | 2 | 1.5 |
| Water | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus |
The formula three of table 4 surface conditioning agent
| Sequence number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| PTFE | 10 | 15 | 20 | 10 | 15 | 20 | 10 | 30 | 35 |
| PA | 15 | 10 | 5 | 10 | 5 | 15 | 20 | 10 | 15 |
| Praseodymium oxide | 0.05 | 1.5 | 0.4 | 1.5 | 0.5 | 1 | 4 | 1 | 3 |
| Water | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus |
The formula four of table 5 surface conditioning agent
The formula five of table 6 surface conditioning agent
| Sequence number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| PTFE | 10 | 15 | 20 | 10 | 15 | 20 | 10 | 30 | 35 |
| PA | 15 | 10 | 5 | 10 | 5 | 15 | 5 | 10 | 20 |
| Lanthanum chloride | 0.05 | 0.1 | 0.2 | 1.5 | 0.2 | 3 | 0.5 | 4 | 5 |
| Water | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus |
The formula six of table 7 surface conditioning agent
| Sequence number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| PTFE | 10 | 15 | 20 | 10 | 15 | 20 | 10 | 30 | 35 |
| PA | 15 | 10 | 5 | 10 | 5 | 15 | 20 | 10 | 15 |
| Cerous nitrate | 0.05 | 1.5 | 0.5 | 1.5 | 0.2 | 0.3 | 5 | 2 | 1.5 |
| Water | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus |
The formula seven of table 8 surface conditioning agent
After surface conditioning agent prepares, assorted fibre Nomex element felt is carried out to surface treatment, concrete steps are:
(1) inorganic agent is poured into and soaked in hopper;
(2) by unwinding device, plain felt is delivered to soak in hopper and floods;
(3) the assorted fibre felt after soaking treatment agent is sent into stentering forming stove and be dried, first at 120～160 ℃, dry, then bake at 180～210 ℃;
(4) utilize wrap-up to carry out rolling to the assorted fibre Nomex after processing.
Assorted fibre Nomex element felt utilizes laminating machine laminating polytetrafluoroethylene (PTFE) microporous barrier on assorted fibre felt after processing, and concrete steps are:
(1) assorted fibre Nomex and polytetrafluoroethylene (PTFE) microporous barrier after processing are placed on unwinding device separately, and unreel with identical speed;
(2) under hot-pressing roller, assorted fibre Nomex and PTFE microporous barrier are covered to pressure, temperature is 280～360 ℃, and pressure is 0.1～0.5MPa;
(3) utilize wrap-up by the rolling of overlay film assorted fibre felt.
PTFE microporous barrier at high temperature with the polymer protective film generation melting on assorted fibre Nomex surface, molecule shifts mutually, thereby makes PTFE microporous barrier firmly be attached to assorted fibre felt surface.Assorted fibre Nomex filter efficiency after overlay film is up to more than 99.99%, and long service life, and running resistance is low.
Claims (7)
1. the manufacture method of a high filtration, high temperature resistant, anticorrosive overlay film assorted fibre Nomex, it is characterized in that assorted fibre Nomex element felt to carry out, after corrosion-resistant treatments, forming by hot pressing cladding with microporous teflon membran through the surface conditioning agent containing RE surface modifying agent; Aforementioned surfaces inorganic agent, formulated by weight by following component:
Ptfe emulsion 10～35%, polyacrylate dispersion 5～20%, RE surface modifying agent 0.05～5%, surplus are water;
Aforementioned corrosion-resistant treatments is performed such: assorted fibre Nomex element felt is after surface conditioning agent dipping, and preliminary drying 2～10min at 100～250 ℃, then bake 2～15min at 180～250 ℃, obtains the assorted fibre Nomex of processing.
2. the method for claim 1, it is characterized in that described assorted fibre Nomex element felt is that the two sides that the two-layer assorted fibre layer being mixed by polyimides short fiber, PTFE short fiber and glass chopped silk is overlying on respectively to base cloth by pre-needling and main acupuncture forms, wherein in assorted fibre layer, the weight content of various fibers is:
Glass fibre: 5 ~ 30%
Polyimide fiber: 5 ~ 30%
PTFE fiber: 40 ~ 90%
3. method as claimed in claim 2, is characterized in that described base cloth is glass fibre base cloth, PTFE base cloth or a kind of in the base cloth of glass fibre and PTFE fiber blend.
4. the method as described in claim 1 or 2 or 3, is characterized in that microporous teflon membran is prepared from by weight by following component:
PTFE micro mist: 60～85%, lubricant: 15～40%.
5. method as claimed in claim 4, is characterized in that microporous teflon membran aperture is at 0.02 μ m～3 μ m.
6. the method as described in claim 1 or 2 or 3, the temperature while it is characterized in that hot pressing cladding is 280～360 ℃, pressure is 0.1～2.0MPa.
7. the method as described in claim 1 or 2 or 3, is characterized in that described RE surface modifying agent can be the oxide of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium or the mixture of one or more arbitrary proportions in compound.
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| CN104801109A (en) * | 2014-01-26 | 2015-07-29 | 上海特安纶纤维有限公司 | High-performance high temperature-resistant glass fiber coated nonwoven filter material and preparation method thereof |
| CN104801112A (en) * | 2014-01-26 | 2015-07-29 | 上海特安纶纤维有限公司 | High temperature-resistant polyaryloxadiazole nonwoven filter material and preparation method thereof |
| CN105200670B (en) * | 2015-08-17 | 2017-08-01 | 赖明荣 | A kind of low temperature resistant non-woven fabrics |
| CN106268031B (en) * | 2016-08-09 | 2018-07-10 | 晋江市纯荣纺织科技有限公司 | A kind of fiber crops/graphite composite high-performance filtering material and preparation method thereof |
| CN106432578B (en) * | 2016-10-03 | 2020-03-27 | 辽宁恒星精细化工有限公司 | Glass fiber air filter material treating agent and preparation method thereof |
| CN108057279A (en) * | 2016-11-09 | 2018-05-22 | 浙江严牌过滤技术股份有限公司 | A kind of PTFE membrane filter material and preparation method thereof |
| CN107190503A (en) * | 2017-06-20 | 2017-09-22 | 屈维勇 | A kind of textile fabrics containing rare earth element |
| CN107715707A (en) * | 2017-10-19 | 2018-02-23 | 谢新昇 | A kind of preparation method of corrosion-resistant type miillpore filter |
| CN109663413A (en) * | 2019-03-01 | 2019-04-23 | 抚顺天成环保科技有限公司 | A kind of preparation method of high-temperature-resistant filtering material heat resisting film-coating |
| CN113058344A (en) * | 2021-04-20 | 2021-07-02 | 安徽中电环保材料股份有限公司 | Environment-friendly filter bag for waste incineration plant based on PTFE (polytetrafluoroethylene) film-coated needled felt |
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| CN1768912A (en) * | 2005-10-13 | 2006-05-10 | 中材科技股份有限公司 | High temperature resistant P.T.F.E. coated filter material |
| CN101781444A (en) * | 2010-03-31 | 2010-07-21 | 上海交通大学 | Method for preparing rare-earth-modified glass-fiber epoxy-resin composite materials |
| CN202343014U (en) * | 2011-08-02 | 2012-07-25 | 中材科技股份有限公司 | Hybrid fiber needled felt membrane filter material |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1768912A (en) * | 2005-10-13 | 2006-05-10 | 中材科技股份有限公司 | High temperature resistant P.T.F.E. coated filter material |
| CN101781444A (en) * | 2010-03-31 | 2010-07-21 | 上海交通大学 | Method for preparing rare-earth-modified glass-fiber epoxy-resin composite materials |
| CN202343014U (en) * | 2011-08-02 | 2012-07-25 | 中材科技股份有限公司 | Hybrid fiber needled felt membrane filter material |
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Effective date of registration: 20200220 Address after: 210000 No.30, Andri, Yuhua West Road, Nanjing, Jiangsu Province Patentee after: Nanjing Glass Fibre Research and Design Institute company limited Address before: Jiangning District of Nanjing City, Jiangsu province 211100 Jiangning Science Park Tong Road No. 99 Patentee before: Sinoma Science & Technology Co.,Ltd. |