CN111592021B - 一种改性水滑石及其制备方法 - Google Patents
一种改性水滑石及其制备方法 Download PDFInfo
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- CN111592021B CN111592021B CN202010477433.1A CN202010477433A CN111592021B CN 111592021 B CN111592021 B CN 111592021B CN 202010477433 A CN202010477433 A CN 202010477433A CN 111592021 B CN111592021 B CN 111592021B
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- Prior art keywords
- magnesium
- hydrotalcite
- aluminum
- slurry
- modified hydrotalcite
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- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical class [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 title claims abstract description 102
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 229910001701 hydrotalcite Inorganic materials 0.000 claims abstract description 57
- 229960001545 hydrotalcite Drugs 0.000 claims abstract description 57
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000002002 slurry Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 22
- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 22
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 18
- UJOHNXQDVUADCG-UHFFFAOYSA-L aluminum;magnesium;carbonate Chemical compound [Mg+2].[Al+3].[O-]C([O-])=O UJOHNXQDVUADCG-UHFFFAOYSA-L 0.000 claims abstract description 17
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 239000002243 precursor Substances 0.000 claims description 8
- 238000000498 ball milling Methods 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 4
- 229910001948 sodium oxide Inorganic materials 0.000 claims description 4
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000391 magnesium silicate Substances 0.000 claims description 3
- 229910052919 magnesium silicate Inorganic materials 0.000 claims description 3
- 235000019792 magnesium silicate Nutrition 0.000 claims description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 abstract description 11
- 239000003063 flame retardant Substances 0.000 abstract description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 7
- 239000001301 oxygen Substances 0.000 abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 abstract description 7
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 238000002955 isolation Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 239000012467 final product Substances 0.000 abstract description 2
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 abstract 1
- 239000013078 crystal Substances 0.000 description 13
- 239000000463 material Substances 0.000 description 12
- 238000001179 sorption measurement Methods 0.000 description 11
- 239000000243 solution Substances 0.000 description 9
- GANNOFFDYMSBSZ-UHFFFAOYSA-N [AlH3].[Mg] Chemical class [AlH3].[Mg] GANNOFFDYMSBSZ-UHFFFAOYSA-N 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 239000000779 smoke Substances 0.000 description 7
- 239000002131 composite material Substances 0.000 description 6
- 239000008367 deionised water Substances 0.000 description 6
- 229910021641 deionized water Inorganic materials 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 229910001385 heavy metal Inorganic materials 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- 229910021645 metal ion Inorganic materials 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000004005 microsphere Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- -1 zinc-magnesium-aluminum Chemical compound 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- JLDSOYXADOWAKB-UHFFFAOYSA-N aluminium nitrate Chemical compound [Al+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O JLDSOYXADOWAKB-UHFFFAOYSA-N 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 235000010410 calcium alginate Nutrition 0.000 description 2
- 239000000648 calcium alginate Substances 0.000 description 2
- 229960002681 calcium alginate Drugs 0.000 description 2
- OKHHGHGGPDJQHR-YMOPUZKJSA-L calcium;(2s,3s,4s,5s,6r)-6-[(2r,3s,4r,5s,6r)-2-carboxy-6-[(2r,3s,4r,5s,6r)-2-carboxylato-4,5,6-trihydroxyoxan-3-yl]oxy-4,5-dihydroxyoxan-3-yl]oxy-3,4,5-trihydroxyoxane-2-carboxylate Chemical compound [Ca+2].O[C@@H]1[C@H](O)[C@H](O)O[C@@H](C([O-])=O)[C@H]1O[C@H]1[C@@H](O)[C@@H](O)[C@H](O[C@H]2[C@H]([C@@H](O)[C@H](O)[C@H](O2)C([O-])=O)O)[C@H](C(O)=O)O1 OKHHGHGGPDJQHR-YMOPUZKJSA-L 0.000 description 2
- 238000000975 co-precipitation Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- OEIWPNWSDYFMIL-UHFFFAOYSA-N dioctyl benzene-1,4-dicarboxylate Chemical compound CCCCCCCCOC(=O)C1=CC=C(C(=O)OCCCCCCCC)C=C1 OEIWPNWSDYFMIL-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000001027 hydrothermal synthesis Methods 0.000 description 2
- 238000009616 inductively coupled plasma Methods 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 159000000003 magnesium salts Chemical class 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000004014 plasticizer Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000003980 solgel method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 1
- 150000000703 Cerium Chemical class 0.000 description 1
- 102100035474 DNA polymerase kappa Human genes 0.000 description 1
- 101710108091 DNA polymerase kappa Proteins 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- IHBCFWWEZXPPLG-UHFFFAOYSA-N [Ca].[Zn] Chemical compound [Ca].[Zn] IHBCFWWEZXPPLG-UHFFFAOYSA-N 0.000 description 1
- 125000003545 alkoxy group Chemical group 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000012496 blank sample Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- HBGGXOJOCNVPFY-UHFFFAOYSA-N diisononyl phthalate Chemical compound CC(C)CCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCC(C)C HBGGXOJOCNVPFY-UHFFFAOYSA-N 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Inorganic materials [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 229940005550 sodium alginate Drugs 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/78—Compounds containing aluminium and two or more other elements, with the exception of oxygen and hydrogen
- C01F7/784—Layered double hydroxide, e.g. comprising nitrate, sulfate or carbonate ions as intercalating anions
- C01F7/785—Hydrotalcite
-
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/16—Alumino-silicates
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28033—Membrane, sheet, cloth, pad, lamellar or mat
- B01J20/28035—Membrane, sheet, cloth, pad, lamellar or mat with more than one layer, e.g. laminates, separated sheets
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/26—Aluminium-containing silicates, i.e. silico-aluminates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/34—Silicon-containing compounds
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K9/02—Ingredients treated with inorganic substances
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09C1/407—Aluminium oxides or hydroxides
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
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- C09C3/06—Treatment with inorganic compounds
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
Abstract
本发明涉及一种改性水滑石及其制备方法,所述改性水滑石的制备方法包括:(1)将氢氧化镁、氢氧化铝、碳酸钠和水进行反应制得碳酸镁铝水滑石浆料;(2)将氢氧化镁、氢氧化铝、水玻璃和水反应制得硅酸镁铝浆料;(3)将碳酸镁铝水滑石浆料和硅酸镁铝浆料混合均匀后继续反应晶化,制得本发明最终产物改性水滑石。本发明合成出的改性水滑石在水中具有良好的稳定性、分散性和吸附性,并且制备的改性水滑石中包含具有不燃烧,隔绝氧气特性的硅酸镁铝成分,有极好的阻燃抑烟作用。
Description
技术领域
本发明涉及一种改性水滑石及其制备方法,属于水滑石制备技术领域。
背景技术
随着水滑石应用领域的不断扩展,水滑石的制备研究也得到了迅速的发展。现如今水滑石的制备方法仍以共沉淀法为主,同时还有水热法、溶胶-凝胶法、离子交换法和焙烧热还原法等,但是现有的水滑石制备方法中均存在一些不足。
共沉淀法多采用可溶性铝盐和镁盐做为铝源和镁源,在生产过程中,会产生低价值的钠盐,生产成本高,也不利于环保;溶胶-凝胶法则采用金属的烷氧基化合物为原料,价格昂贵,水解过程不容易控制;而且在生产过程中需要使用大量的有机溶剂,会造成环境污染;离子交换法生产过程比较复杂,而且原料本身就要求是类水滑石材料,经济效益不高;焙烧热还原法需要高温煅烧设备,而且煅烧后仍需要水化,在最终产物中会有一定量的尖晶石杂质,产品质量不高。
水滑石强大的比表面积和多孔结构使其具有较强的吸附能力,是去除水中重金属的有效吸附剂。但是由于常规的水滑石由于颗粒小,团聚并严重吸水,因此分散性差,如:中国专利文献CN106241856A公开了一种锌镁铝类水滑石的制备方法,称取0.5603g Zn(NO3)2·6H2O、1.9329g Mg(NO3)2·6H2O、0.7779g Al(NO3)3·9H2O和1.3959g尿素加到装有40mL去离子水的烧杯中,搅拌溶解后;室温下全部转移到50mL水热反应釜的聚四氟乙烯的内衬中,拧紧反应釜盖,置于鼓风干燥箱,待自然冷却后取出;将反应液全部转移到离心管中,使用离心机离心分离,收集沉淀,用无水乙醇离心洗涤两次,蒸馏水离心洗涤三次;然后置于70℃鼓风干燥箱中干燥24h,研磨即制备得到锌镁铝三元水滑石材料。但该方法制备的水滑石在水中分散性不佳。
另外水滑石可以有效吸附有机气体,水滑石本身在燃烧过程中会释放出结晶水,来降低物体表面温度,因此水滑石在电缆料中具有阻燃抑烟作用,但阻燃性不佳,如:中国专利文献CN106006705A公开一种阻燃抑烟材料及其制备方法,材料中二价金属离子和三价金属离子的摩尔比为(1.3:1)~(1.7:1),其中,二价金属离子为Mg2+,三价金属离子为摩尔比为(14:1)~(18:1)的Al3+和Ce3+;制备时将镁盐、铝盐、铈盐溶解于去离子水中得到溶液A,将NaOH和Na2CO3溶解于去离子水中得到溶液B,用溶液B调节溶液A的pH值为7.5~8后,置于140℃下热处理10~12h,将沉淀过滤、洗涤、干燥、压片、筛分,得到阻燃抑烟材料。该离子工艺制备的水滑石晶核多晶粒小,结晶度低,而且水洗环节较难洗涤,会产生大量废水,副产物较多,后处理成本较大。
发明内容
针对现有技术的不足,本发明提供一种改性水滑石及其制备方法,目的是提高水滑石的吸附和阻燃抑烟能力,解决水滑石在水中分散性不佳,制备工艺复杂等问题。
本发明的技术方案如下:
一种改性水滑石的制备方法,包括步骤如下:
(1)将氢氧化镁、氢氧化铝和水放入球磨机中球磨1~2h,球磨后的浆料升温至90~110℃,搅拌1~2h,然后加入碳酸钠,反应1~4h,得到碳酸镁铝水滑石浆料;
(2)将氢氧化铝和水玻璃混合后,升温至90~100℃,搅拌反应1~2h,得到硅酸镁铝前驱体;将氢氧化镁和水放入球磨机中研磨1~2h,取出浆料加入至硅酸镁铝前驱体中混合均匀,继续反应1~4h,得到硅酸镁铝浆料;
(3)将碳酸镁铝水滑石浆料和硅酸镁铝浆料混合均匀,在90~110℃下晶化2~6h,经固液分离,干燥磨粉后,得到改性水滑石。
根据本发明优选的,步骤(1)中,氢氧化镁和氢氧化铝的纯度大于97%,白度大于95%。
根据本发明优选的,步骤(1)中,氢氧化镁、氢氧化铝和碳酸钠摩尔比为(1.5~3):1:(0.5~1)。
根据本发明优选的,步骤(1)和步骤(2)中,球磨机中研磨球的直径为4~8mm。
根据本发明优选的,步骤(1)中,球磨后的浆料中固含量为10~20%。
根据本发明优选的,步骤(2)中,氢氧化铝、氢氧化镁与水玻璃中二氧化硅的摩尔比为(1.5~3):1:(1.5~3)。
根据本发明优选的,步骤(2)中,球磨后的浆料中固含量为10~20%。
根据本发明优选的,步骤(2)中,水玻璃的模数为3.1~3.4,二氧化硅含量>26%,氧化钠含量>7.5%,铁含量<0.1%。
根据本发明优选的,步骤(3)中,碳酸镁铝水滑石浆料和硅酸镁铝浆料的摩尔比为(3~6):1,均以氢氧化镁的摩尔数计算。
本发明还提供根据上述制备方法所制得的改性水滑石。
本发明的技术特点:
本发明以硅酸镁铝复合改性镁铝水滑石,由于碳酸镁铝水滑石晶种多,晶种之间吸附叠加,而形成粒径不规则,分布范围较宽的产品,而硅酸镁铝为一种多层阴离子物质,在水中会形成立体网状结构,能够使碳酸镁铝水滑石在晶体生长过程中形成较好的诱导模板作用,使碳酸镁铝水滑石生长形成规则的大晶粒,提高了自身的热分解温度,最终得到的改性水滑石具有多层及多孔结构具有水和气的透过性、流变性,在水中分散性和悬浮性极好,可以大大提高碳酸镁铝的吸附性能,并且制备的改性水滑石中包含具有不燃烧,隔绝氧气特性的硅酸镁铝成分,有极好的阻燃抑烟作用。
本发明的有益效果:
(1)本发明以硅酸镁铝复合改性镁铝水滑石,两者的结合,使两者的优点大大提升,使镁铝水滑石这种双层状功能材料包含具有不燃烧,隔绝氧气特性的硅酸镁铝成分,硅酸镁铝在水中具有良好的稳定性、分散性和吸附性,使得改性水滑石的吸附、分散、阻燃性能得到极大的提高,同时符合当今环保形势的要求,可以用于制备电缆等工业用品,能够更好的服务于环保材料,并且也是一种新型的吸附剂,可以用来去除废水中的重金属离子。
(2)本发明使用的原料成本低,制备工艺简单,便于操作,同时制备过程中无废水排放,工艺绿色环保,不会对环境产生影响。
附图说明
图1是为本发明实施例1所得改性水滑石的XRD图。
图2是为本发明实施例1所得改性水滑石的粒径分布图。
图3是为本发明实施例1所得改性水滑石的SEM图。
具体实施方式
以下对本发明的具体实施方式进行详细说明。应当理解的是,此处所描述的具体实施方式仅用于说明和解释本发明,并不用于限制本发明。
市售国产镁铝水滑石,成分:碳酸根型镁铝水滑石,纯度96%以上。
实施例1
一种改性水滑石的制备方法,包括步骤如下:
(1)将232g氢氧化镁、180g氢氧化铝和水5000g放入球磨机中,研磨1h,球磨机中研磨球的直径为5mm;取出固含量为15%的浆料置于反应器中,升温至100℃,搅拌2h,然后加入140g碳酸钠,继续反应2h,得到碳酸镁铝水滑石晶种;
(2)将160g氢氧化铝和230g水玻璃加入反应器中升温至90℃,搅拌反应1h,得到硅酸镁铝前驱体;然后将58g氢氧化镁和500g水放入球磨机中研磨1h,球磨机中研磨球的直径为5mm,取出浆料加入至硅酸镁铝前驱体中混合均匀,继续反应2h,得到硅酸镁铝晶种;
(3)将碳酸镁铝水滑石浆料和硅酸镁铝浆料混合均匀,在100℃下晶化4h,经固液分离,干燥磨粉后,得到改性水滑石。
其中,步骤(1)中氢氧化镁和氢氧化铝的纯度为99%,白度为98%;水玻璃的模数为3.1~3.4,二氧化硅含量>26%,氧化钠含量>7.5%,铁含量<0.1%;步骤(3)中,碳酸镁铝水滑石浆料和硅酸镁铝浆料的摩尔比为4:1,均以氢氧化镁的摩尔数计算。
本实施例制备的改性水滑石为735g,其XRD谱图,如图1所示。由图1可知,2θ值为11.59、23.42、34.07等处衍射峰为水滑石类化合物的衍射峰,产品单一,并且这3个衍射峰成倍数关系,表明改性水滑石具有良好的层状结构。其粒度分布图,如图2所示。由图2可知,所制备的改性水滑石微粒分布均匀,粒度集中度高,50%的微粒分布在4~5μm。其SEM图,如图3所示,由图3可知,所制备的改性水滑石呈现典型的层状结构。
实施例2
一种改性水滑石的制备方法,包括步骤如下:
(1)将200g氢氧化镁、160g氢氧化铝和4000g水放入球磨机中,研磨1h,球磨机中研磨球的直径为5mm;取出固含量为20%的浆料置于反应器中,升温至100℃,搅拌2h,然后加入120g碳酸钠,继续反应2h,得到碳酸镁铝水滑石晶种;
(2)将140g氢氧化铝和200g水玻璃加入反应器中升温至90℃,搅拌反应1h,得到硅酸镁铝前驱体;然后将58g氢氧化镁和500g水放入球磨机中研磨1h,球磨机中研磨球的直径为5mm,取出浆料加入至硅酸镁铝前驱体中混合均匀,继续反应2h,得到硅酸镁铝晶种;
(3)将碳酸镁铝水滑石晶种和硅酸镁铝晶种混合均匀,在100℃下晶化4h,经固液分离,干燥磨粉后,得到改性水滑石。
其中,步骤(1)中氢氧化镁和氢氧化铝的纯度为99%,白度为98%;水玻璃的模数为3.1~3.4,二氧化硅含量>26%,氧化钠含量>7.5%,铁含量<0.1%;步骤(3)中,碳酸镁铝水滑石浆料和硅酸镁铝浆料的摩尔比为4:1,均以氢氧化镁的摩尔数计算。
本实施例制备的改性水滑石为720g,50%的微粒分布在4~5μm。
对实施例1和市售国产镁铝水滑石进行性能测试。
试验例1:重金属吸附试验测试
具体测试方法:将实施例1制备的镁铝水滑石和市售国产镁铝水滑石分别按照配方:海藻酸钠盐3g、水滑石5g,聚乙二醇(聚合度800)5mL,去离子水100mL,加入到超声器中水浴超声分散1h,将分散液分别通过滴定管缓慢滴加到质量分数为3%的CaCl2水溶液中,形成的微球在溶液中浸泡12h,然后过滤用去离子水洗涤干净,60度干燥24h,得到水滑石海藻酸钙微球,用同样的方法设置空白组。
分别用去离子水配置重金属离子溶液,Cu2+溶液浓度为100mg/L,Cd2+溶液浓度为100mg/L,Pd2+溶液浓度为60mg/L,将水滑石海藻酸钙微球和空白组分别放入不同的样品浸泡50h后,过滤,通过ICP测定滤液的离子浓度,得到不同样品的吸附率,结果如表1所示
表1
不同重金属离子吸附率 | 实施例1 | 市售国产镁铝水滑石 | 空白组 |
Cu<sup>2+</sup>(100mg/L) | 80% | 71% | 66% |
Cd<sup>2+</sup>(100mg/L) | 81% | 72% | 66% |
Pd<sup>2+</sup>(60mg/L) | 89% | 77% | 69% |
由表1可知,实施例1制备的改性水滑石对Cu2+、Cd2+和Pd2+的吸附率达到了80%以上,市售国产镁铝水滑石的吸附率仅有70%左右,说明本发明制备的改性水滑石对金属离子的吸附能力明显增强,吸附效率提升了9~12%,说明实施例1制备的改性水滑石在水中分散能力明显高于市售的镁铝水滑石。
试验例2:电缆材料阻燃抑烟性能测试
具体测试方法:将实施例1制备的镁铝水滑石和市售国产镁铝水滑石分别按照配方:聚氯乙烯(PVC)100g、钙锌稳定剂5g、对苯二甲酸二辛酯(DOTP)40g、增塑剂DINP30g、辅助增塑剂10g、润滑剂2g、阻燃填充助剂30g、水滑石8g,混合均匀,通过挤出机制得试验片材,根据国标要求制成标准形状,进行拉伸强度、断裂伸长率、氧指数试验,发烟量测试,结果如表2所示:
表2
不同样品测试指标 | 实施例1 | 市售国产镁铝水滑石 | 空白样品 |
拉伸强度 | 15.2 | 11.03 | 12.03 |
断裂伸长率 | 153.01 | 121.05 | 154.15 |
氧指数 | 36 | 32 | 30 |
发烟量 | 极少 | 少 | 多 |
由表1可知,实施例1制备的改性水滑石在拉伸强度和断裂伸长率上明显优于市售镁铝产品;应用实施例1改性水滑石的电缆材料的氧指数达到了36,具有极高阻燃性能且发烟量极少,市售国产镁铝水滑石的氧指数为32,仅具有阻燃性能,且发烟量较实施例1稍多,说明实施例1制备的改性水滑石在阻燃抑烟方面也明显优于市售产品。
Claims (9)
1.一种改性水滑石的制备方法,包括步骤如下:
(1)将氢氧化镁、氢氧化铝和水放入球磨机中球磨1~2h,球磨后的浆料升温至90~110℃,搅拌1~2h,然后加入碳酸钠,反应1~4h,得到碳酸镁铝水滑石浆料;
(2)将氢氧化铝和水玻璃混合后,升温至90~100℃,搅拌反应1~2h,得到硅酸镁铝前驱体;将氢氧化镁和水放入球磨机中研磨1~2h,取出浆料加入至硅酸镁铝前驱体中混合均匀,继续反应1~4h,得到硅酸镁铝浆料;
(3)将碳酸镁铝水滑石浆料和硅酸镁铝浆料混合均匀,在90~110℃下晶化2~6h,经固液分离,干燥磨粉后,得到改性水滑石;
其中,碳酸镁铝水滑石浆料和硅酸镁铝浆料,以氢氧化镁的摩尔数计算,摩尔比为(3~6):1。
2.如权利要求1所述的改性水滑石的制备方法,其特征在于,步骤(1)中,氢氧化镁和氢氧化铝的纯度大于97%,白度大于95%。
3.如权利要求1所述的改性水滑石的制备方法,其特征在于,步骤(1)中,氢氧化镁、氢氧化铝和碳酸钠摩尔比为(1.5~3):1:(0.5~1)。
4.如权利要求1所述的改性水滑石的制备方法,其特征在于,步骤(1)和步骤(2)中,球磨机中研磨球的直径为4~8mm。
5.如权利要求1所述的改性水滑石的制备方法,其特征在于,步骤(1)中,球磨后的浆料中固含量为10~20%。
6.如权利要求1所述的改性水滑石的制备方法,其特征在于,步骤(2)中,氢氧化铝、氢氧化镁与水玻璃中二氧化硅的摩尔比为(1.5~3):1:(1.5~3)。
7.如权利要求1所述的改性水滑石的制备方法,其特征在于,步骤(2)中,球磨后的浆料中固含量为10~20%。
8.如权利要求1所述的改性水滑石的制备方法,其特征在于,步骤(2)中,水玻璃的模数为3.1~3.4,二氧化硅含量>26%,氧化钠含量>7.5%,铁含量<0.1%。
9.一种改性水滑石,其特征在于,按照权利要求1~8任意一项所述制备方法制备得到。
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