CN112337190A - Modified filter material and preparation method thereof - Google Patents
Modified filter material and preparation method thereof Download PDFInfo
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- CN112337190A CN112337190A CN202011120595.6A CN202011120595A CN112337190A CN 112337190 A CN112337190 A CN 112337190A CN 202011120595 A CN202011120595 A CN 202011120595A CN 112337190 A CN112337190 A CN 112337190A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0414—Surface modifiers, e.g. comprising ion exchange groups
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- Chemical Kinetics & Catalysis (AREA)
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- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
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Abstract
The invention belongs to the field of water filtration, and particularly relates to a modified filter material and a preparation method thereof. The method comprises the following steps: the modifier emulsion composed of water-based acrylic resin, rare earth compound, wetting agent, defoaming agent and deionized water is applied to a filter material base material made of microfiber glass wool and 0-20% of skeleton fiber in percentage by mass as a sizing agent, and the rare earth modified glass fiber composite filter material is prepared after subsequent treatment. According to the invention, the compactness of the glass fiber surface modification layer can be effectively and obviously improved by introducing the rare earth into the filter material modifier, so that the high-temperature chemical precipitation resistance of the filter paper is improved, and the waste problems of large usage amount and low efficiency in the use process of the traditional coupling agent are avoided.
Description
Technical Field
The invention belongs to the field of water filtration, and particularly relates to a modified filter material and a preparation method thereof.
Background
The glass fiber filter material is prepared by adopting a traditional wet papermaking forming process, and the main raw material is micro glass fiber cotton. The glass fiber filter material has various pore sizes and distribution modes, and high and low pollutant carrying capacityThe advantages of fluid resistance and the like are advocated in the field of water filtration and separation, and the application is wide. However, the silica skeleton of the glass fiber in water environment is attacked and destroyed by hydroxide ions, which causes the destruction of the surface layer structure, the dissolution and the separation of SiO2Resulting in a shortened life of the filter material and SiO2Water quality can also be affected; the erosion rate is accelerated at high temperatures, SiO2The precipitation was more severe.
In order to solve the above problems, an adhesive or a sizing agent is usually added in the production process of the glass fiber filter material to form a protective layer on the surface of the glass fiber to slow down erosion, and a coupling agent is added to improve the bonding degree of the glass fiber and the protective layer.
Acrylic resin is a commonly used adhesive and modifier, has good temperature resistance and can play a certain protection role on the filter material, but in certain severe working conditions, the temperature resistance and chemical corrosion resistance of the acrylic resin are not enough to meet the use requirements, and the modified filter material can be seriously corroded by SiO under the working condition of high temperature2High precipitation and short service life.
Disclosure of Invention
The invention aims to provide a modified filter material and a preparation method thereof, which adopt a rare earth compound to modify waterborne acrylic resin, can effectively and obviously improve the heat resistance of the filter material, and inhibit a glass fiber filter material from SiO under the working condition of high temperature2And (4) precipitating.
The technical solution for realizing the purpose of the invention is as follows: a modified filter material is characterized in that a glass fiber filter material base material is modified by a modifier containing rare earth elements.
A preparation method of the modified filter material comprises the following steps: the modifier emulsion composed of water-based acrylic resin, rare earth compound, wetting agent, defoaming agent and deionized water is applied to a filter material base material made of microfiber glass wool and 0-20% of skeleton fiber in percentage by mass as a sizing agent, and the rare earth modified glass fiber composite filter material is prepared after subsequent treatment.
Further, the modifier emulsion comprises, by mass, 5% -40% of aqueous acrylic resin, 0.01% -0.5% of rare earth compound, 0.01% -5% of wetting agent, 0.01% -0.5% of defoaming agent and 54% -94.97% of deionized water.
Further, the preparation method of the modifier emulsion comprises the following steps: adding deionized water required for preparing the modifier into a container, sequentially adding the acrylic resin, the rare earth compound, the wetting agent and the defoaming agent, and stirring for 5-30min under the condition that the stirring speed is 100-500r/min to obtain the modifier emulsion.
Further, the water-based acrylic resin is selected from at least one of pure acrylic resin, styrene-acrylic resin, epoxy modified styrene-acrylic resin, organic fluorine modified styrene-acrylic resin, organic silicon modified styrene-acrylic resin, vinyl acetate-acrylic resin, tertiary acrylic resin and silicone-acrylic resin;
the rare earth element in the rare earth compound is one or more of lanthanum, cerium, , terbium or neodymium, and the rare earth compound is one or more of chloride, nitrate, sulfate and acetate of rare earth;
the wetting agent is selected from one or more of polyoxyethylene compounds, octyl phenol ethoxy compounds, acetylene glycol ethoxy compounds and organosilicon wetting agents;
the defoaming agent is selected from one or more of polyacrylate, polydimethylsiloxane and polyether modified polysiloxane;
the polyoxyethylene compound is selected from one or more of polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether and polyoxyethylene polyoxypropylene segmented copolymer.
Further, the preparation method of the filter material base material comprises the following steps:
adding water and a dispersing agent into a fiber raw material consisting of microfiber glass wool and 0-20% of skeleton fibers in percentage by mass, and uniformly dispersing to obtain fiber slurry;
and sequentially deslagging, diluting, molding and dehydrating the obtained fiber slurry to form a filter material base material with uniform thickness.
Further, the skeleton fiber is inorganic fiber or organic fiber;
the dispersant is one or a mixture of more than two of a surfactant, a water-soluble high molecular compound or an acid.
Further, the inorganic fiber is one or more of glass fiber, carbon fiber, quartz fiber, basalt fiber, ceramic fiber and metal fiber;
the organic fiber is preferably one or more of polypropylene fiber, polyester fiber, polyamide fiber, acrylic fiber, aramid fiber, polyethylene fiber, polypropylene fiber, polyamide fiber, polyester fiber, polytetrafluoroethylene fiber and polyether sulfone fiber;
the surfactant is quaternary ammonium salt or fatty acid salt;
the acid is sulfuric acid, acetic acid or oxalic acid;
the water-soluble high molecular compound is polyoxyethylene and polyacrylamide. (ii) a
When the dispersing agent is a surfactant or a water-soluble high molecular compound, the addition mass of the dispersing agent accounts for 0.01-1% of the mass of the fiber slurry; when the dispersing agent is acid, the pH value of the fiber slurry is 2-5;
the concentration of the fiber slurry is 0.5-5%;
the concentration of the fiber slurry after dilution is 0.1-1%.
Further, the subsequent processing specifically comprises: attaching a non-woven fabric to the modified filter material base material to which the modifier emulsion is applied to prepare a rare earth modified glass fiber composite filter material;
the applied mass of the modifier emulsion is 3-30% of the mass of the filter material base material.
A method for improving the binding force of a protective layer of a glass fiber composite filter material is to apply a modifier emulsion containing rare earth elements on the surface of the glass fiber composite filter material.
Compared with the prior art, the invention has the remarkable advantages that:
(1) the modifier containing the rare earth compound is adopted, rare earth elements can be adsorbed to the surface of the glass fiber through chemical bonding and physical adsorption, and a distortion zone is generated near the surface of the fiber, so that the bonding force between the glass fiber and the modification layer can be improved due to the formation of the distortion zone, the compactness of the modification layer is improved, the microcrack on the surface of the glass fiber can be protected, and the water is prevented from permeating into the crack to cause corrosion.
(2) The modifier of the application does not contain a coupling agent, so that the waste of the coupling agent and the interference of the intervention of silane on the formation of a distortion area are avoided.
(3) The modifier avoids too much rare earth elements to obstruct the generation of a fiber surface distortion area through reasonably setting the proportion of various components and components, and adopts a wetting agent to improve the surface tension of the fiber so as to assist the adsorption capacity of the enhanced rare earth and the glass fiber, so that the fiber glass substrate can be better wetted, thereby improving the adhesive force of the modifier on the glass fiber substrate and reducing the cost simultaneously.
(4) The application discloses filter media substrate is made by glass fiber and skeleton fiber doping, and the cotton diameter of microfiber glass is little, has fine filtration adsorption efficiency to tiny particle and molecule after processing into filter paper, and doping skeleton fiber can make the microfiber cotton distribution more even on this basis.
(5) The rare earth modifier and the glass fiber are wrapped more tightly, the erosion rate of the glass fiber in a water environment can be effectively delayed under the working condition of higher temperature, and the SiO of the glass fiber filter material can be better inhibited2And the filter material is separated out, and the service life of the filter material is prolonged.
Detailed Description
The invention provides a preparation method of a modified filter material, which comprises the following steps:
1) pre-dispersing a modifier: adding part of deionized water required by the preparation of the modifier into a container, sequentially adding the water-based acrylic resin, the rare earth compound, the wetting agent and the defoaming agent, and stirring for 5-30min under the condition that the stirring speed is 100-500 r/min.
2) Adding water and a dispersing agent into a fiber raw material, and uniformly dispersing to obtain slurry;
3) sequentially carrying out deslagging, diluting, forming and dehydrating on the slurry obtained in the step 2 to form a wet paper sheet with uniform thickness;
4) applying the emulsion obtained in the step 1 as a sizing agent on the filter material base material obtained in the step 3;
5) and (4) attaching a non-woven fabric to the modified filter material base material obtained in the step (4) to obtain the rare earth modified glass fiber composite filter material.
In the following examples:
SiO2the amount of precipitation was measured in accordance with SL91.2-1994 "measurement of silica (soluble) (silicomolybdenum blue spectrophotometry").
Example 1
The mass percentage of each component in the total mass of the modifier is shown in table 1:
table 1 percentage of each component in example 1
| Components | Mass percent/%) |
| Epoxy modified styrene-acrylic resin | 5 |
| Lanthanum chloride | 0.01 |
| Wetting agent | 0.2 |
| Defoaming agent | 0.01 |
| Deionized water | 94.78 |
Wherein, the wetting agent is octyl phenol polyoxyethylene ether, and the defoaming agent is polydimethylsiloxane.
The preparation method of the modified filter material in the embodiment 1 comprises the following steps:
1) pre-dispersing a modifier: adding deionized water required by the preparation of a modifier into a container, sequentially adding epoxy modified styrene-acrylic resin, lanthanum chloride, a wetting agent, namely octylphenol polyoxyethylene ether, and a defoaming agent, namely polydimethylsiloxane, and stirring at the speed of 300r/min for 15 min.
2) Adding water and acetic acid into 80 wt% of microfiber glass wool and 20 wt% of polypropylene fiber, and uniformly stirring and dispersing by a high-frequency fluffer to obtain slurry with the concentration of 0.5 wt% and the pH value of 5;
3) deslagging and diluting the slurry obtained in the step (4) into suspension liquid with the concentration of 0.1 wt%, and forming and dehydrating to form wet paper sheets;
4) applying the emulsion obtained in the step 1 as a sizing agent on the filter material base material obtained in the step 3, wherein the sizing amount is 3 wt% of the base material;
5) and (4) attaching a non-woven fabric to the modified filter material base material obtained in the step (4) to obtain the rare earth modified glass fiber composite filter material.
Example 2
The percentage of the mass of each component in the total mass of the modifier is shown in table 2:
table 2 percentage of each component in example 2
| Components | Mass percent/%) |
| Pure propylene resin | 32 |
| Styrene-acrylic resin | 8 |
| Cerium acetate | 0.5 |
| Wetting agent | 5 |
| Defoaming agent | 0.3 |
| Deionized water | 54.2 |
Wherein the wetting agent is a polyether organic silicon wetting agent and an acetylene glycol wetting agent in a ratio of 4: 1; the defoaming agent is polyether modified polysiloxane.
The preparation method of the modified filter material in the embodiment 2 comprises the following steps:
1) pre-dispersing a modifier: adding deionized water required by the preparation of a modifier into a container, sequentially adding pure propylene resin, styrene-acrylic resin, cerium nitrate, a polyether organic silicon wetting agent, an acetylene glycol wetting agent and a defoaming agent polyether modified polysiloxane, and stirring at the speed of 250r/min for 30 min.
2) Adding water and sulfuric acid into 100 wt% of glass microfiber cotton, and uniformly stirring by a high-frequency fluffer to obtain slurry with the concentration of 2 wt% and the pH of 3;
3) deslagging and diluting the slurry obtained in the step (4) into a suspension liquid with the concentration of 0.5 wt%, and forming and dehydrating to form a filter material base material;
4) applying the emulsion obtained in the step 1 as a sizing agent on the filter material base material obtained in the step 3, wherein the sizing amount is 20 wt% of the base material;
5) and (4) attaching a non-woven fabric to the modified filter material base material obtained in the step (4) to obtain the rare earth modified glass fiber composite filter material.
Example 3
The percentage of the mass of each component in the total mass of the modifier is shown in table 3:
table 3 percentage of each component in example 3
| Components | Mass percent/%) |
| Organosilicon modified styrene-acrylic resin | 15 |
| Nitric acid | 0.15 |
| Neodymium nitrate | 0.15 |
| Wetting agent | 0.01 |
| Defoaming agent | 0.5 |
| Deionized water | 84.19 |
Wherein the wetting agent is an isomeric fatty alcohol ether wetting agent, and the defoaming agent is polyacrylate.
The preparation method of the modified filter material in the embodiment 3 comprises the following steps:
1) pre-dispersing a modifier: adding 2/3 deionized water required by the preparation of a modifier into a container, sequentially adding organic silicon modified styrene-acrylic resin, nitric acid , neodymium nitrate, wetting agent isomeric fatty alcohol ether and defoaming agent polyacrylate, and stirring at the speed of 500r/min for 5 min.
2) Adding water and polyacrylamide into a mixture of 95 wt% of glass microfiber cotton and 5 wt% of carbon fiber, and uniformly stirring by a high-frequency fluffer to obtain slurry with the concentration of 5 wt% and the pH value of 2;
3) deslagging and diluting the slurry obtained in the step (4) into a suspension liquid with the concentration of 1 wt%, and forming and dehydrating to form a filter material base material;
4) applying the emulsion obtained in the step 1 as a sizing agent on the filter material base material obtained in the step 3, wherein the sizing amount is 30 wt% of the base material;
5) and (4) attaching a non-woven fabric to the modified filter material base material obtained in the step (4) to obtain the rare earth modified glass fiber composite filter material.
Comparative example
The glass fiber filter material is prepared from the conventional acrylic acid adhesive according to the conventional filter material generation process in the field.
Test example
SiO glass fiber filter materials of examples 1-3 and comparative example2The amount of precipitation was measured and the test results are shown in Table 4.
TABLE 4 SiO of glass fiber filter materials of examples 1-3 and comparative examples at different temperatures2Amount of precipitation
As can be seen from the comparison between the above examples and comparative examples, the rare earth modifier can better wrap the glass fiber, effectively delay the erosion rate of the glass fiber in the water environment under the working condition of higher temperature, and better inhibit the SiO of the glass fiber filter material2And the filter material is separated out, and the service life of the filter material is prolonged.
Claims (10)
1. A modified filter material is characterized in that a modifier containing rare earth elements is adopted to modify a glass fiber filter material base material.
2. The preparation method of the modified filter material is characterized by comprising the following steps: the modifier emulsion composed of water-based acrylic resin, rare earth compound, wetting agent, defoaming agent and deionized water is applied to a filter material base material made of microfiber glass wool and 0-20% of skeleton fiber in percentage by mass as a sizing agent, and the rare earth modified glass fiber composite filter material is prepared after subsequent treatment.
3. The method according to claim 2, wherein the composition of the aqueous acrylic resin, the rare earth compound, the wetting agent, the defoaming agent and the deionized water in the modifier emulsion comprises the following components in percentage by mass: 5 to 40 percent of water-based acrylic resin, 0.01 to 0.5 percent of rare earth compound, 0.01 to 5 percent of wetting agent, 0.01 to 0.5 percent of defoaming agent and 54 to 94.97 percent of deionized water.
4. The method of claim 3, wherein the modifier emulsion is prepared by: adding deionized water required for preparing the modifier into a container, sequentially adding the water-based acrylic resin, the rare earth compound, the wetting agent and the defoaming agent, and stirring for 5-30min under the condition that the stirring speed is 100-500r/min to prepare the modifier emulsion.
5. The method according to claim 4, wherein the aqueous acrylic resin is selected from at least one of pure acrylic resin, styrene-acrylic resin, epoxy-modified styrene-acrylic resin, organic fluorine-modified styrene-acrylic resin, organic silicon-modified styrene-acrylic resin, vinyl acetate-acrylic resin, tertiary acrylic resin and silicone acrylic resin;
the rare earth element in the rare earth compound is one or more of lanthanum, cerium, , terbium or neodymium, and the rare earth compound is one or more of chloride, nitrate, sulfate and acetate of rare earth;
the wetting agent is selected from one or more of polyoxyethylene compounds, octyl phenol ethoxy compounds, acetylene glycol ethoxy compounds and organosilicon wetting agents;
the defoaming agent is selected from one or more of polyacrylate, polydimethylsiloxane and polyether modified polysiloxane;
the polyoxyethylene compound is selected from one or more of polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether and polyoxyethylene polyoxypropylene segmented copolymer.
6. The method of claim 2 wherein the filter substrate is prepared by the following steps:
adding water and a dispersing agent into a fiber raw material consisting of microfiber glass wool and 0-20% of skeleton fibers in percentage by mass, and uniformly dispersing to obtain fiber slurry;
and sequentially deslagging, diluting, molding and dehydrating the obtained fiber slurry to form a filter material base material with uniform thickness.
7. The method of claim 6, wherein the skeletal fibers are inorganic fibers or organic fibers;
the dispersant is one or a mixture of more than two of a surfactant, a water-soluble high molecular compound or an acid.
8. The method according to claim 7, wherein the inorganic fiber is one or more of glass fiber, carbon fiber, quartz fiber, basalt fiber, ceramic fiber and metal fiber;
the organic fiber is preferably one or more of polypropylene fiber, polyester fiber, polyamide fiber, acrylic fiber, aramid fiber, polyethylene fiber, polypropylene fiber, polyamide fiber, polyester fiber, polytetrafluoroethylene fiber and polyether sulfone fiber;
the surfactant is quaternary ammonium salt or fatty acid salt;
the acid is sulfuric acid, acetic acid or oxalic acid;
the water-soluble high molecular compound is polyoxyethylene and polyacrylamide. (ii) a
When the dispersing agent is a surfactant or a water-soluble high molecular compound, the addition mass of the dispersing agent accounts for 0.01-1% of the mass of the fiber slurry; when the dispersing agent is acid, the pH value of the fiber slurry is 2-5;
the concentration of the fiber slurry is 0.5-5%;
the concentration of the fiber slurry after dilution is 0.1-1%.
9. The method according to claim 2, wherein the subsequent processing is specifically: attaching a non-woven fabric to the modified filter material base material to which the modifier emulsion is applied to prepare a rare earth modified glass fiber composite filter material;
the applied mass of the modifier emulsion is 3-30% of the mass of the filter material base material.
10. A method for improving the binding force of a protective layer of a glass fiber composite filter material is characterized in that a modifier emulsion containing rare earth elements is applied to the surface of the glass fiber composite filter material.
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| CN202011120595.6A CN112337190A (en) | 2020-10-19 | 2020-10-19 | Modified filter material and preparation method thereof |
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| CN202011120595.6A CN112337190A (en) | 2020-10-19 | 2020-10-19 | Modified filter material and preparation method thereof |
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| CN1487017A (en) * | 2003-07-17 | 2004-04-07 | 上海交通大学 | Prepn of RE-modified composite glass fiber/polypropylene material |
| CN102808326A (en) * | 2012-08-13 | 2012-12-05 | 中材科技股份有限公司 | Preparation method for modified inorganic fiber cloth |
| CN104650729A (en) * | 2015-03-10 | 2015-05-27 | 江苏欣安新材料技术有限公司 | Preparation method of anti-falling corrosion-resistant double-metal composite coating |
| CN105713292A (en) * | 2014-12-03 | 2016-06-29 | 天津滨浦生产力促进有限公司 | Glass-fiber-reinforced polypropylene composite and preparation method thereof |
| CN108842519A (en) * | 2018-06-30 | 2018-11-20 | 泾县道旺环保科技有限公司 | A kind of method of environmentally protective manufacture high-quality air filter paper |
| CN111495036A (en) * | 2020-03-27 | 2020-08-07 | 南京玻璃纤维研究设计院有限公司 | Glass fiber composite filter material, preparation method and application thereof |
-
2020
- 2020-10-19 CN CN202011120595.6A patent/CN112337190A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1487017A (en) * | 2003-07-17 | 2004-04-07 | 上海交通大学 | Prepn of RE-modified composite glass fiber/polypropylene material |
| CN102808326A (en) * | 2012-08-13 | 2012-12-05 | 中材科技股份有限公司 | Preparation method for modified inorganic fiber cloth |
| CN105713292A (en) * | 2014-12-03 | 2016-06-29 | 天津滨浦生产力促进有限公司 | Glass-fiber-reinforced polypropylene composite and preparation method thereof |
| CN104650729A (en) * | 2015-03-10 | 2015-05-27 | 江苏欣安新材料技术有限公司 | Preparation method of anti-falling corrosion-resistant double-metal composite coating |
| CN108842519A (en) * | 2018-06-30 | 2018-11-20 | 泾县道旺环保科技有限公司 | A kind of method of environmentally protective manufacture high-quality air filter paper |
| CN111495036A (en) * | 2020-03-27 | 2020-08-07 | 南京玻璃纤维研究设计院有限公司 | Glass fiber composite filter material, preparation method and application thereof |
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