CN117735946B - Magnesium oxychloride low-carbon gel material with excellent carbonization resistance and preparation method thereof - Google Patents
Magnesium oxychloride low-carbon gel material with excellent carbonization resistance and preparation method thereof Download PDFInfo
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- CN117735946B CN117735946B CN202410183362.2A CN202410183362A CN117735946B CN 117735946 B CN117735946 B CN 117735946B CN 202410183362 A CN202410183362 A CN 202410183362A CN 117735946 B CN117735946 B CN 117735946B
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- 239000000463 material Substances 0.000 title claims abstract description 101
- IQYKECCCHDLEPX-UHFFFAOYSA-N chloro hypochlorite;magnesium Chemical compound [Mg].ClOCl IQYKECCCHDLEPX-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 238000003763 carbonization Methods 0.000 title claims abstract description 68
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title abstract description 26
- 229920000734 polysilsesquioxane polymer Polymers 0.000 claims abstract description 39
- 239000000835 fiber Substances 0.000 claims abstract description 35
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 35
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 35
- 239000000203 mixture Substances 0.000 claims abstract description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 106
- 239000000395 magnesium oxide Substances 0.000 claims description 59
- 238000003756 stirring Methods 0.000 claims description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 229940050906 magnesium chloride hexahydrate Drugs 0.000 claims description 31
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 claims description 31
- 239000002994 raw material Substances 0.000 claims description 27
- 239000011268 mixed slurry Substances 0.000 claims description 21
- 239000011259 mixed solution Substances 0.000 claims description 21
- 230000000694 effects Effects 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 11
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 229920002554 vinyl polymer Polymers 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 9
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical group C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 8
- 125000004429 atom Chemical group 0.000 claims description 7
- 238000007792 addition Methods 0.000 claims description 6
- 125000000304 alkynyl group Chemical group 0.000 claims description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 6
- 125000003837 (C1-C20) alkyl group Chemical group 0.000 claims description 4
- 125000002723 alicyclic group Chemical group 0.000 claims description 4
- 125000003342 alkenyl group Chemical group 0.000 claims description 4
- 125000003545 alkoxy group Chemical group 0.000 claims description 4
- 125000003118 aryl group Chemical group 0.000 claims description 4
- 125000005843 halogen group Chemical group 0.000 claims description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 4
- 150000001412 amines Chemical class 0.000 claims description 3
- 125000005395 methacrylic acid group Chemical group 0.000 claims description 3
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 claims description 2
- 125000005504 styryl group Chemical group 0.000 claims description 2
- 125000003396 thiol group Chemical group [H]S* 0.000 claims description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 claims 1
- 125000003277 amino group Chemical group 0.000 claims 1
- 125000003700 epoxy group Chemical group 0.000 claims 1
- 125000005462 imide group Chemical group 0.000 claims 1
- 230000009257 reactivity Effects 0.000 claims 1
- 239000004568 cement Substances 0.000 abstract description 40
- 238000006703 hydration reaction Methods 0.000 abstract description 13
- 230000036571 hydration Effects 0.000 abstract description 12
- 239000011148 porous material Substances 0.000 abstract description 5
- 239000002245 particle Substances 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 25
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical group [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 22
- 239000004567 concrete Substances 0.000 description 20
- -1 polysiloxane Polymers 0.000 description 15
- 239000000047 product Substances 0.000 description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 12
- 229910001629 magnesium chloride Inorganic materials 0.000 description 11
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 8
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 7
- 239000000654 additive Substances 0.000 description 6
- 239000001569 carbon dioxide Substances 0.000 description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 229920001296 polysiloxane Polymers 0.000 description 6
- 230000000996 additive effect Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000007774 longterm Effects 0.000 description 5
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 5
- 239000000347 magnesium hydroxide Substances 0.000 description 5
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 4
- 239000000920 calcium hydroxide Substances 0.000 description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 4
- 235000019341 magnesium sulphate Nutrition 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 229910001388 sodium aluminate Inorganic materials 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 229960002337 magnesium chloride Drugs 0.000 description 3
- MSRJTTSHWYDFIU-UHFFFAOYSA-N octyltriethoxysilane Chemical compound CCCCCCCC[Si](OCC)(OCC)OCC MSRJTTSHWYDFIU-UHFFFAOYSA-N 0.000 description 3
- 229960003493 octyltriethoxysilane Drugs 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007863 gel particle Substances 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 description 2
- 229940051841 polyoxyethylene ether Drugs 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 229910021487 silica fume Inorganic materials 0.000 description 2
- TUZVMPXGFZSNBG-UHFFFAOYSA-N 3-aminopyrrole-2,5-dione Chemical compound NC1=CC(=O)NC1=O TUZVMPXGFZSNBG-UHFFFAOYSA-N 0.000 description 1
- 241001131796 Botaurus stellaris Species 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 125000001309 chloro group Chemical class Cl* 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 description 1
- 229940061634 magnesium sulfate heptahydrate Drugs 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 239000002114 nanocomposite Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- OLZDXDPSDUSGIS-UHFFFAOYSA-N sulfinylmagnesium Chemical compound [Mg].S=O OLZDXDPSDUSGIS-UHFFFAOYSA-N 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application discloses an anti-carbonization magnesium oxychloride low-carbon gel material and a preparation method thereof, and belongs to the technical field of modified magnesium oxychloride materials. The PTFE fiber and the cage polysilsesquioxane with a specific structure are creatively introduced into the magnesium oxychloride cement, so that the stability of a hydration phase and the binding force among internal particles are improved, the internal pores of the gel material are fewer, and the binding strength and the compressive strength of the material are improved. The magnesium oxychloride cementing material obtained by adopting the specific composition of the scheme of the application has good carbonization resistance, and the mechanical properties of cement products prepared by the material are not obviously deteriorated after carbonization for more than 6 months in humid air.
Description
Technical Field
The invention relates to a magnesium oxychloride low-carbon gel material with excellent carbonization resistance and a preparation method thereof, belongs to the field of building material manufacture, and can solve the problems that a system is loose and porous and the material performance is influenced due to the atmospheric carbonization effect of the magnesium oxychloride gel material when the magnesium oxychloride gel material is used for a long time in an air environment.
Background
Magnesium Oxychloride Cement (MOC) is an air hardening cementing material which is prepared by mixing light burned magnesium powder, a blending agent and water according to a certain proportion, wherein the blending agent is magnesium chloride or magnesium sulfate, and compared with silicate cement, the cement has the advantages of low alkalinity, quick setting and hardening, high mechanical strength, high fire resistance, good wear resistance and the like, and can be used for producing light heat insulation materials, decorative materials, building materials, fire resistance materials and the like. Meanwhile, compared with the conversion of limestone into ordinary Portland cement, the method has the advantages of lower calcination temperature for producing MgO, lower carbon dioxide emission, no need of kiln and other specific equipment in the production process, energy conservation and low consumption. In the production and use process, no toxic and volatile gas is generated, and no harm is caused to human body and environment. However, magnesium oxychloride cement has poor water resistance, is easy to absorb moisture, prevent halogen and deform, widely uses a modifier for improving the water resistance of the magnesium oxychloride cement, and can effectively solve the problem of poor water resistance of the magnesium oxychloride cement material at present through researching a large number of modifiers. However, when the cement is used for a long time in an air environment, the magnesium oxychloride cement material can absorb carbon dioxide in the air, so that a large amount of carbon dioxide is sealed in the concrete, and the carbon emission of the building industry is reduced. In the process, ions released by dissolution of 5-phase 5Mg (OH) 2·MgCl2·8H2 O (i.e. 518) and magnesium hydroxide in magnesium oxychloride cement hydrate can form an alkaline environment in the cement material, under the other conditions, the internally stored carbon dioxide can react with the ions to form magnesium carbonate mineral substances, the process firstly can lead to dissolution and loss of part of magnesium chloride, meanwhile, the 5-phase 518 in the material hydrate can be carbonized into Mg (OH) 2·MgCl2·2MgCO3·4H2 O (i.e. 1126) by the atmosphere and further carbonized into 4MgCO 3·Mg(OH)2·4H2 O (i.e. 414), and the large formation of 414 in the outdoor and outdoor environment can not form effective protection effect on the interior of the magnesium oxychloride cement material, so that the performance of the magnesium oxychloride cement material is deteriorated, and the material is durable and ineffective. On the other hand, the hydration alkaline product inside the magnesium oxychloride cement material is neutralized along with carbonization, so that the internal pH value is reduced, steel materials and the like in the concrete lose the protection of strong alkali environment and are corroded, the volume of the concrete expands, the binding force between the concrete and the steel materials is reduced, the structural safety is seriously influenced, and the use of the magnesium oxychloride cement product is greatly adversely affected.
For inhibiting the poor weather resistance caused by long-time carbonization of magnesium oxychloride cement materials, a great deal of research is also carried out at present, and most of the research is focused on the introduction of novel additives and fillers, for example, CN104559770B discloses a high weather-resistant anti-icing polysiloxane material for concrete and a preparation method thereof, wherein the high weather-resistant anti-icing polysiloxane material for concrete comprises the following components in parts by weight: 20-70 parts of amino modified polyether polysiloxane, 10-30 parts of epoxy modified polysiloxane, 10-20 parts of polymethylphenylsilsesquioxane, 5-10 parts of polypropylmethylsilsesquioxane and 5-10 parts of alkoxy silane. The polysiloxane material has excellent flexibility, mechanical strength and lower surface energy, and has very high contact angle and low contact angle hysteresis (rolling angle) to water when polysiloxane chain contains relatively large steric hindrance group and hydrophobic group, and is favorable to self cleaning, ice coating prevention and weather resistance of concrete. CN105693134B discloses a functional concrete admixture, the main raw materials of which are cross-linked polyvinyl siloxane and/or cross-linked poly hexenyl siloxane, polymethylphenylsilsesquioxane, alkoxysilane, stearate, fatty amine polyoxyethylene ether and fatty acid polyoxyethylene ester. The additive is added in the concrete mixing process, and is poured for use after being uniformly mixed with adhesive materials, aggregates and the like, and the functional concrete additive has the effects of inhibiting the transmission of erosion media in the concrete under severe environments, reducing the water absorption rate of the concrete, improving the hydrophobicity of the concrete and inhibiting the transmission of gaps of the erosion media. The invention can greatly improve the erosion resistance of the concrete, thereby obviously improving the durability of the concrete. CN109399997a discloses a high-strength concrete admixture for municipal construction, comprising a nanocomposite filler: 10-30 parts of epoxy modified polysiloxane: 12-17 parts of polypropylmethyl silsesquioxane: 22-25 parts of alkoxy silane: 0.5-1.5 parts of nano silicon dioxide: 2-8 parts of a thickener: 1.2-1.8 parts of a hydrophobizing agent: 2.5-5.5 parts of silica fume: 17-23 parts of fly ash: 12-13 parts of: 55-85 parts of redispersible rubber powder: 0.2-1.1 parts of gypsum powder: 3.5-5 parts of water reducer: 11-14 parts of nano titanium dioxide: 13-18 parts of fatty amine polyoxyethylene ether: 13-17 parts of fatty acid polyoxyethylene ester: 20-23 parts of the additive, which is complementary to the advantages of effectively combining the components, can effectively improve the chlorine salt corrosion resistance of the concrete, so that the durability of the concrete is obviously improved, and simultaneously, the additive has good compressive strength and water permeability. CN110183125B discloses a magnesium oxychloride inorganic gel material with high strength, rapid hardening and low energy consumption and a preparation method thereof, wherein the magnesium oxychloride inorganic gel material is prepared from, by weight, 235-335 parts of light burned magnesium oxide, 150-170 parts of magnesium chloride hexahydrate, 90-100 parts of water and 2-40 parts of sodium aluminate, and during the preparation, the magnesium chloride hexahydrate and the water are mixed according to a proportion, and fully and uniformly stirred to form a transparent mixed solution; adding sodium aluminate according to the proportion, and stirring until uniform; adding light burned magnesia according to the proportion, and stirring for 5 min to obtain uniform cement slurry; pouring the stirred magnesium oxychloride cement into a mould for compaction, solidifying at normal temperature for 24 h, demoulding, and performing air curing at room temperature; the preparation process is simple, and the low-cost sodium aluminate is added, so that a great amount of OH-ions and heat are released by utilizing the hydration reaction of the sodium aluminate, the pH value and the temperature of a hydration system are improved, the mechanical property of magnesium oxychloride cement is effectively improved, the hydration process is accelerated, and the setting time is shortened. CN104926165A discloses an anti-carbonization basic magnesium sulfate cement and a preparation method thereof, wherein the anti-carbonization basic magnesium sulfate cement comprises the following components in percentage by mass: 40-55% of magnesium oxide, 20-25% of magnesium sulfate heptahydrate, 10-20% of industrial waste slag powder, 5-9% of white slag, 3-8% of mineral admixture, 2-4% of desulfurized gypsum, 6-8% of slag, 2-4% of straw, 1-3% of silica fume and 1-3% of coagulant. The basic anti-carbonization magnesium sulfate cement is formed by adding a proper additive into magnesium oxysulfide cement, and the main hydration product is high-strength 517 whisker, which belongs to a novel special cement with self-formation, high strength, high toughness, high folding ratio, carbonization resistance, bittern resistance, water heat resistance, sea water resistance, impact resistance, fatigue resistance, carbonization resistance, steel bar corrosion resistance, high durability and long service life. CN113526937B discloses a method and a product for improving the strength of a calcium hydroxide carbonized hardened body, which are prepared by uniformly mixing a calcium hydroxide raw material, ordinary portland cement, magnesium hydroxide, ceramic sand and water according to the mass ratio of 100:15-20:15-20:40-80:10-20, and performing compression molding, carbonization maintenance and natural maintenance. According to the invention, through the synergistic effect of physical adsorption and chemical reaction, the C-S-H gelation generated by hydration of the cement, the cementing effect of the carbonized product of the magnesium hydroxide and the gas transmission channel and internal curing effect of the ceramic sand further improve the carbonization degree and the gelation of the reaction product while consuming the moisture generated by carbonization of the calcium hydroxide, so that the strength of the carbonized hardened body of the calcium hydroxide is greatly improved.
The addition of a large amount of organic matters increases the production cost, and part of organic matters have toxicity, so that the production is not facilitated; meanwhile, the addition of the solid filler can change the original basic pore structure in the magnesium oxychloride cementing material, and the total porosity of the magnesium oxychloride cementing material can be increased along with the increase of the doping amount of the solid waste filler, so that the harmful pores in the interior are increased, the strength of a cement product is gradually reduced, and the performance of the cementing material is adversely affected.
Therefore, development of a magnesium oxychloride low-carbon gelling material with excellent carbonization resistance and a preparation method thereof have important significance for improving the long-term service life of the magnesium oxychloride gelling material and the safety performance of products.
Disclosure of Invention
In order to solve the defects in the prior art, the application provides a magnesium oxychloride low-carbon gelling material with excellent carbonization resistance and a preparation method thereof, PTFE fibers and cage-type polysilsesquioxane are creatively introduced into the composition of a conventional magnesium oxychloride gelling material, firstly, the PTFE fibers and the cage-type polysilsesquioxane are taken as raw materials, a hydrophobic protective film can be formed on the surfaces of 5-phase 5Mg (OH) 2·MgCl2·8H2 O and 3-phase 3Mg (OH) 2·MgCl2·8H2 O generated by condensation hardening in the magnesium oxychloride gelling material, the protective film can fully wrap an effective hydration phase of cement, so that the cement is prevented from being contacted with water to be dissolved with internal Mg, in addition, the cage-type polysilsesquioxane is in a three-dimensional network structure, and through sufficient stirring in the preparation process, magnesium oxychloride gel particles are tightly fixed on the cage-type polysilsesquioxane to be in a three-dimensional network, so that the stability of the hydration phase and the binding force among internal particles are further improved, the internal pores of the gel material are less, and the bonding strength and compression strength of the material are improved. Most importantly, the applicant finds that the magnesium oxychloride cementing material obtained by adopting the specific composition of the scheme of the application has good carbonization resistance, and the cement product prepared by the material has no obvious deterioration of mechanical properties after carbonization for more than 6 months in humid air, so that the material has long-term stability.
The invention aims to provide a magnesium oxychloride low-carbon gel material with excellent carbonization resistance, which consists of the following raw materials in parts by weight: 100 parts of light burned MgO, 50-80 parts of magnesium chloride hexahydrate, 30-50 parts of water, 0.5-5 parts of PTFE fiber and 5-10 parts of cage polysilsesquioxane. The activity index of the light burned magnesia is 60-70%.
As a preferable scheme, 100 parts of light burned MgO, 50-60 parts of magnesium chloride hexahydrate, 30-40 parts of water, 2-4 parts of PTFE fiber and 7-10 parts of cage polysilsesquioxane.
Further preferably, the mass ratio of the light burned MgO, the magnesium chloride hexahydrate, the water, the PTFE fiber and the cage-type polysilsesquioxane is 100:60:30:3:8.
Cage polysilsesquioxane, english name polyhedraloligomericsilsesquioxane, POSS for short, is an active group-containing oligomeric silsesquioxane (rsio 1.5) n, wherein n is 7, 8, 9, 10 or 12, R is a group attached to eight top Si atoms, wherein R comprises at least two reactive groups, each R group independently being a hydrogen atom, a halogen atom, a hydroxyl group, a C1-20 alkyl group, an alkenyl group, an alkynyl group, an aryl group, an alicyclic group, an alkoxy group, or-OSiR 1R2R3, wherein R 1、R2、R3 is independently a hydrogen atom, a halogen atom, a hydroxyl group, a C1-20 alkyl group, an alkenyl group, an alkynyl group, an aryl group, an alicyclic group, an alkoxy group; wherein the reactive group is one or a mixture of vinyl, allyl, styrene, alkynyl, epoxy, amino, maleimide, glycidyl, acrylic, methacrylic, hydroxyl and mercapto. The structural formula is as follows:
The cage polysilsesquioxane is of various kinds and the specific distinction is mainly based on the kind and number of R groups, and the names are also named according to the difference of R groups, for example, when R groups are vinyl, amino and phenyl, they can be called vinyl POSS, amino POSS and phenyl POSS respectively. The cage polysilsesquioxane related to the invention can be vinyl POSS, amino POSS, methacrylic POSS or styryl POSS, for example, and can be expanded to any one of other end groups, and can be obtained through purchase.
Another object of the present invention is to provide a method for preparing a magnesium oxychloride low-carbon gel material having excellent carbonization resistance, comprising the steps of: (1) Weighing the raw materials according to the following proportion, wherein 100 parts of light burned MgO, 50-80 parts of magnesium chloride hexahydrate, 30-50 parts of water, 0.5-5 parts of PTFE fiber and 5-10 parts of cage polysilsesquioxane; (2) Sequentially adding PTFE fiber and cage-type polysilsesquioxane into water under the stirring condition, continuously stirring for 5min until the PTFE fiber and the cage-type polysilsesquioxane are uniformly dispersed, then adding magnesium chloride hexahydrate, and continuously stirring until the magnesium chloride hexahydrate is completely dissolved to obtain a mixed solution; (3) Adding MgO weighed in the step (1) into the mixed solution obtained in the step (2) twice, wherein the interval between the two MgO additions is at least 10min, and continuously stirring for 30min after all MgO is added to obtain mixed slurry; (4) Pouring the mixed slurry obtained in the step (3) into a stainless steel mold, vibrating and trowelling, and curing to obtain the magnesium oxychloride low-carbon gel material with excellent carbonization resistance. Because MgO activity is high in the process of preparing magnesium oxychloride cement, a large amount of heat can be rapidly generated when raw materials are mixed, such as magnesium oxide is added into magnesium chloride solution at one time, the reaction process is accelerated too fast, the reaction heat release is concentrated, the production operation is influenced, and the product can be deformed in a buckling way. The applicant finds that the problems can be effectively solved by controlling the MgO addition amount through a large number of experiments, the problems can be better overcome by controlling the MgO addition time to 2 times, the heat generation of the system is controllable, and the prepared product is flat.
As a preferable scheme, the mass ratio of the MgO added before and after the MgO in the step (3) is 2:1 or 1:1.
As a preferable scheme, the curing specifically comprises: and (3) placing the die after vibration trowelling in an environment with the temperature of 25 ℃ and the humidity of 50+/-5% for curing, demolding after curing for 24 hours, and then naturally curing indoors for 28 days.
Another object of the present invention is to provide the use of a magnesium oxychloride low carbon gel material having excellent carbonization resistance in a coastal dike dam-dissipating wave-dissipating block, road concrete or non-structural concrete, which has excellent carbonization resistance in a wet environment, and a cement product using the same has no significant deterioration in mechanical properties after carbonization in a wet air for more than 6 months.
Compared with the prior art, the technical scheme of the application has the following beneficial effects:
The application obtains the magnesium oxychloride low-carbon gel material with excellent carbonization resistance, which is obtained by introducing PTFE fibers and cage polysilsesquioxane into the composition of the conventional magnesium oxychloride gel material. The applicant firstly proposes that PTFE fiber and cage-type polysilsesquioxane are used as raw materials for preparing a magnesium oxychloride low-carbon gel material, and discovers that when the PTFE fiber and the cage-type polysilsesquioxane coexist, a hydrophobic protective film can be formed on the surfaces of 5-phase 5Mg (OH) 2·MgCl2·8H2 O and 3-phase 3Mg (OH) 2·MgCl2·8H2 O generated by the coagulation and the hardening of the magnesium oxychloride gel material, the protective film can fully wrap an effective hydration phase of cement, so that the effective hydration phase of the cement is prevented from being contacted with water to be dissolved by the internal Mg, in addition, the cage-type polysilsesquioxane presents a three-dimensional network structure, magnesium oxychloride gel particles can be tightly fixed on the cage-type polysilsesquioxane to present a three-dimensional network through sufficient stirring in the preparation process, the stability of the hydration phase and the binding force among the internal particles are further improved, so that the internal pores of the gel material are fewer, and the binding strength and the compression strength of the material are improved. Most importantly, the applicant finds that the magnesium oxychloride gel material obtained by adopting the specific composition of the scheme of the application has good carbonization resistance. It is known that the initial carbonization of the magnesium oxychloride cement material has a certain benefit to the system, but after the system is stabilized, the carbon dioxide sealed inside and the carbon dioxide in the external environment can react with the effective hydration phase inside the magnesium oxychloride cement material, namely 5-phase 5Mg (OH) 2·MgCl2·8H2 O and 3-phase 3Mg (OH) 2·MgCl2·8H2 O generated by setting and hardening to form magnesium carbonate, so that a new phase, namely 4MgCO 3·Mg(OH)2·4H2 O (namely 414), is obtained, and a large amount of 414 is formed in the outdoor and outdoor environment so as not to form an effective protection effect on the inside of the magnesium oxychloride cement material, thereby causing the degradation of the performance of the magnesium oxychloride cement material and the durability failure of the material. The scheme of the application can effectively solve the carbonization problem of the magnesium oxychloride cementing material, improves the long-term stability of the cementing material, and greatly improves the stability and service life of a product obtained by using the cementing material in a humid environment, and the mechanical property of the cement product prepared by the cementing material is not obviously deteriorated after being carbonized in humid air for more than 6 months, so that the cementing material has long-term stability, and the magnesium oxychloride low-carbon cementing material with excellent carbonization resistance has great commercial value.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention more clear, the technical solutions of the embodiments of the present invention will be described in further detail below, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which a person skilled in the art would obtain without making any inventive effort, are within the scope of the invention.
It is noted that reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The experimental methods in the following examples are conventional methods unless otherwise specified. Materials, reagents and the like used in the examples described below are commercially available unless otherwise specified.
The main device of the carbonization experiment comprises a concrete carbonization test box which meets the requirements of carbonization test equipment in GBJ 82-85 cement long-term durability test. And measuring carbonization performance of the cement paste under the environment of constant temperature, constant humidity and CO 2 concentration. And (3) before carbonization, placing the test piece into a drying oven for standard maintenance to 14 d, and drying 24: 24 h at 60 ℃. Placing the dried test piece into a carbonization box at 25 ℃ and maintaining the test piece at 70+/-5% of humidity until the test piece reaches a specified age. And (3) placing the prepared test piece into a carbonization test box, carbonizing at the concentration and volume fraction of CO 2 of 20.0%, and determining that the strength of the test piece after carbonization for 90 days is 53.5MPa.
Example 1
A magnesium oxychloride low-carbon gel material with excellent carbonization resistance consists of the following raw materials in parts by weight: 100 parts of light burned MgO with the activity index of 60-70%, 50 parts of magnesium chloride hexahydrate, 30 parts of water, 0.5 part of PTFE fiber and 5 parts of cage polysilsesquioxane. The preparation method comprises the following steps: the preparation method comprises the steps of (1) weighing raw materials according to the proportion, wherein cage-type polysilsesquioxane is (RSiO 1.5)8, two of groups connected with eight vertex angle Si atoms are styrene, and the rest are hydrogen atoms, (2) sequentially adding PTFE fiber and styrene-based cage-type polysilsesquioxane into water under stirring conditions, continuously stirring for 5min until the materials are uniformly dispersed, then adding magnesium chloride hexahydrate, continuously stirring until the materials are completely dissolved to obtain a mixed solution, (3) adding 2/3 of MgO weighed in the step (1) into the mixed solution obtained in the step (2), continuously stirring for 10 min, then adding residual MgO, continuously stirring for 30min after all MgO is added to obtain mixed slurry, (4) pouring the mixed slurry obtained in the step (3) into a stainless steel mold, curing the mixed slurry in an environment with the temperature of 25 ℃ and the humidity of 50+/-5% after vibration trowelling, demolding after curing for 24h, and then naturally curing for 28 days indoors to obtain a magnesium oxychloride low carbon gel material with excellent carbonization resistance, and testing the strength of a test piece after carbonization is 54.7MPa.
Example 2
A magnesium oxychloride low-carbon gel material with excellent carbonization resistance consists of the following raw materials in parts by weight: 100 parts of light burned MgO with the activity index of 60-70%, 80 parts of magnesium chloride hexahydrate, 50 parts of water, 5 parts of PTFE fiber and 10 parts of cage polysilsesquioxane. The preparation method comprises the following steps: the preparation method comprises the steps of (1) weighing raw materials according to the proportion, namely (RSiO 1.5)12, two of groups connected by eight vertex angle Si atoms are vinyl groups, and the rest are hydrogen atoms), (2) sequentially adding PTFE fiber and vinyl cage polysilsesquioxane into water under stirring conditions, continuously stirring for 5min until the raw materials are uniformly dispersed, then adding magnesium chloride hexahydrate, continuously stirring until the raw materials are completely dissolved to obtain a mixed solution, (3) adding half of MgO weighed in the step (1) into the mixed solution obtained in the step (2), continuously stirring for 10 min, then adding the rest MgO, continuously stirring for 30min after all MgO is added to obtain mixed slurry, (4) pouring the mixed slurry obtained in the step (3) into a stainless steel mold, placing the mold in an environment with the temperature of 25 ℃ and the humidity of 50+/-5% for curing under vibration trowelling, demolding after the curing is carried out for 24h, and then carrying out indoor natural curing for 28 days to obtain the magnesium oxychloride low-carbon gel material with excellent carbonization resistance, and testing the strength of 67.4MPa after carbonization of a test piece.
Example 3
A magnesium oxychloride low-carbon gel material with excellent carbonization resistance consists of the following raw materials in parts by weight: 100 parts of light burned MgO with the activity index of 60-70%, 60 parts of magnesium chloride hexahydrate, 30 parts of water, 3 parts of PTFE fiber and 8 parts of cage polysilsesquioxane. The preparation method comprises the following steps: the preparation method comprises the steps of (1) weighing raw materials according to the proportion, wherein cage-type polysilsesquioxane is (RSiO 1.5)12, two groups connected by eight vertex angle Si atoms are vinyl and amino respectively, and the rest are hydrogen atoms, (2) sequentially adding PTFE fiber and vinyl amino cage-type polysilsesquioxane into water under stirring conditions, continuously stirring for 5min until the materials are uniformly dispersed, then adding magnesium chloride hexahydrate, continuously stirring until the materials are completely dissolved to obtain a mixed solution, (3) adding half of MgO weighed in the step (1) into the mixed solution obtained in the step (2), continuously stirring for 10min, then adding residual MgO, continuously stirring for 30min after all MgO is added to obtain mixed slurry, (4) pouring the mixed slurry obtained in the step (3) into a stainless steel mold, curing the mold in an environment with the temperature of 25 ℃ and the humidity of 50+/-5% after vibration trowelling, demolding after the curing for 24h, and then naturally curing for 28 days indoors to obtain a magnesium oxychloride low carbon gel material with excellent carbonization resistance, and testing the strength of a test piece after carbonization of 60.3MPa.
Comparative example 1
A magnesium oxychloride low-carbon gel material with excellent carbonization resistance consists of the following raw materials in parts by weight: 100 parts of light burned MgO with the activity index of 60-70%, 40 parts of magnesium chloride hexahydrate, 30 parts of water, 3 parts of PTFE fiber and 8 parts of cage polysilsesquioxane. The preparation method comprises the following steps: the preparation method comprises the steps of (1) weighing raw materials according to the proportion, wherein cage-type polysilsesquioxane is (RSiO 1.5)12, two groups connected by eight vertex angle Si atoms are vinyl and amino respectively, and the rest are hydrogen atoms, (2) sequentially adding PTFE fiber and vinyl amino cage-type polysilsesquioxane into water under stirring conditions, continuously stirring for 5min until the materials are uniformly dispersed, then adding magnesium chloride hexahydrate, continuously stirring until the materials are completely dissolved to obtain a mixed solution, (3) adding half of MgO weighed in the step (1) into the mixed solution obtained in the step (2), continuously stirring for 10min, then adding residual MgO, continuously stirring for 30min after all MgO is added to obtain mixed slurry, (4) pouring the mixed slurry obtained in the step (3) into a stainless steel mold, curing the mold in an environment with the temperature of 25 ℃ and the humidity of 50+/-5% after vibration trowelling, demolding after the curing for 24h, and then naturally curing for 28 days indoors to obtain the magnesium oxychloride low carbon gel material with excellent carbonization resistance, and testing the strength of a test piece after carbonization of 40.9MPa.
Comparative example 2
A magnesium oxychloride low-carbon gel material with excellent carbonization resistance consists of the following raw materials in parts by weight: 100 parts of light burned MgO with the activity index of 60-70%, 40 parts of magnesium chloride hexahydrate, 30 parts of water and 3 parts of PTFE fiber. The preparation method comprises the following steps: (1) weighing the raw materials according to the proportion; (2) Adding PTFE fiber into water under stirring, continuously stirring for 5min until the PTFE fiber is uniformly dispersed, then adding magnesium chloride hexahydrate, and continuously stirring until the PTFE fiber is completely dissolved to obtain a mixed solution; (3) Adding half of MgO weighed in the step (1) into the mixed solution obtained in the step (2), continuously stirring for 10 minutes, then adding the rest MgO, and continuously stirring for 30 minutes after all MgO is added to obtain mixed slurry; (4) Pouring the mixed slurry obtained in the step (3) into a stainless steel mold, vibrating and trowelling, placing the mold into an environment with the temperature of 25 ℃ and the humidity of 50+/-5% for curing, demolding after curing for 24 hours, and then naturally curing for 28 days indoors to obtain the magnesium oxychloride low-carbon gel material with excellent carbonization resistance. The strength of the test piece after carbonization was tested to be 13.4MPa.
Comparative example 3
A magnesium oxychloride low-carbon gel material with excellent carbonization resistance consists of the following raw materials in parts by weight: 100 parts of light burned MgO with the activity index of 60-70%, 60 parts of magnesium chloride hexahydrate, 30 parts of water and 8 parts of cage polysilsesquioxane. The preparation method comprises the following steps: the preparation method comprises the steps of (1) weighing raw materials according to the proportion, namely (RSiO 1.5)12, two groups connected by eight vertex angle Si atoms are vinyl and amino respectively, and the rest are hydrogen atoms), (2) adding the vinyl amino cage polysilsesquioxane into water under stirring, continuously stirring for 5min until the materials are uniformly dispersed, then adding magnesium chloride hexahydrate, continuously stirring until the materials are completely dissolved to obtain a mixed solution, (3) adding half of MgO weighed in the step (1) into the mixed solution obtained in the step (2), continuously stirring for 10 min, then adding the rest MgO, continuously stirring for 30min after all MgO is added to obtain mixed slurry, 4) pouring the mixed slurry obtained in the step (3) into a stainless steel mold, placing the mold in an environment with the temperature of 25 ℃ and the humidity of 50+/-5% for maintenance after vibration trowelling, and then carrying out indoor natural maintenance for 28 days to obtain the magnesium oxychloride low-carbon gel material with excellent carbonization resistance, and testing the strength of a test piece after carbonization is 25.7MPa.
Comparative example 4
A magnesium oxychloride low-carbon gel material with excellent carbonization resistance consists of the following raw materials in parts by weight: 100 parts of light burned MgO with the activity index of 60-70%, 60 parts of magnesium chloride hexahydrate, 30 parts of water, 3 parts of PTFE fiber and 8 parts of triethoxy octyl silane. The preparation method comprises the following steps: (1) weighing the raw materials according to the proportion; (2) Sequentially adding PTFE fiber and triethoxy octyl silane into water under the stirring condition, continuously stirring for 5min until the PTFE fiber and the triethoxy octyl silane are uniformly dispersed, then adding magnesium chloride hexahydrate, and continuously stirring until the magnesium chloride hexahydrate is completely dissolved to obtain a mixed solution; (3) Adding half of MgO weighed in the step (1) into the mixed solution obtained in the step (2), continuously stirring for 10 minutes, then adding the rest MgO, and continuously stirring for 30 minutes after all MgO is added to obtain mixed slurry; (4) Pouring the mixed slurry obtained in the step (3) into a stainless steel mold, vibrating and trowelling, placing the mold in an environment with the temperature of 25 ℃ and the humidity of 50+/-5% for curing, demolding after curing for 24 hours, and then naturally curing for 28 days indoors to obtain the magnesium oxychloride low-carbon gel material with excellent carbonization resistance, wherein the strength of a test piece after carbonization is 10.3MPa through testing.
Comparative example 5
A magnesium oxychloride low-carbon gel material with excellent carbonization resistance consists of the following raw materials in parts by weight: 100 parts of light burned MgO with the activity index of 60-70%, 60 parts of magnesium chloride hexahydrate, 30 parts of water, 3 parts of PTFE fiber and 8 parts of polymethylphenylsilsesquioxane. The preparation method comprises the following steps: (1) weighing the raw materials according to the proportion; (2) Sequentially adding PTFE fiber and polymethylphenylsilsesquioxane into water under stirring, continuously stirring for 5min until the PTFE fiber and the polymethylphenylsilsesquioxane are uniformly dispersed, then adding magnesium chloride hexahydrate, and continuously stirring until the magnesium chloride hexahydrate is completely dissolved to obtain a mixed solution; (3) Adding half of MgO weighed in the step (1) into the mixed solution obtained in the step (2), continuously stirring for 10 minutes, then adding the rest MgO, and continuously stirring for 30 minutes after all MgO is added to obtain mixed slurry; (4) Pouring the mixed slurry obtained in the step (3) into a stainless steel mold, vibrating and trowelling, placing the mold in an environment with the temperature of 25 ℃ and the humidity of 50+/-5% for curing, demolding after curing for 24 hours, and then naturally curing for 28 days indoors to obtain the magnesium oxychloride low-carbon gel material with excellent carbonization resistance, wherein the strength of a test piece after carbonization is 12.7MPa through testing.
The foregoing describes in detail a magnesium oxychloride low-carbon gelling material with excellent carbonization resistance and a method for preparing the same, and the foregoing describes in further detail the present invention in connection with specific preferred embodiments, without recognizing that the practice of the present invention is limited to these descriptions. For those skilled in the art, the architecture of the invention can be flexible and changeable without departing from the concept of the invention, and serial products can be derived. But a few simple derivatives or substitutions should be construed as falling within the scope of the invention as defined by the appended claims.
Claims (7)
1. The magnesium oxychloride low-carbon gel material with excellent carbonization resistance is characterized by comprising the following raw materials in parts by weight: 100 parts of light burned MgO, 50-80 parts of magnesium chloride hexahydrate, 30-50 parts of water, 0.5-5 parts of PTFE fiber and 5-10 parts of cage polysilsesquioxane, wherein the cage polysilsesquioxane is active group-containing oligomeric silsesquioxane (RSiO 1.5)n, wherein n is 7, 8, 9, 10 or 12, R is a group connected with eight top angle Si atoms, wherein R at least comprises two groups with reactivity, R groups are respectively and independently hydrogen atom, halogen atom, hydroxyl group, C1-20 alkyl, alkenyl, alkynyl, aryl, alicyclic group, alkoxy or-OSiR 1R2R3, R 1、R2、R3 is respectively and independently hydrogen atom, halogen atom, hydroxyl group, C1-20 alkyl, alkenyl, alkynyl, aryl, alicyclic group and alkoxy, and the reactive group is one or a mixture of vinyl group, allyl group, styrene, alkynyl group, epoxy group, amino group, imide group, glycidyl group, acrylic group, methacrylic group, hydroxyl group and mercapto group.
2. The magnesium oxychloride low carbon gelling material of claim 1, wherein the light burned magnesium oxide has an activity index of 60-70%.
3. The magnesium oxychloride low carbon gel material according to claim 1, wherein the mass ratio of the light burned MgO, magnesium chloride hexahydrate, water, PTFE fiber and cage polysilsesquioxane is 100:60:30:3:8.
4. The magnesium oxychloride low carbon gelling material of claim 1, wherein the cage polysilsesquioxane is at least one of vinyl POSS, amine POSS, methacrylate POSS, or styryl POSS.
5. A method for preparing a magnesium oxychloride low carbon gel material with excellent carbonization resistance as defined in claim 1, which is characterized by comprising the following steps: (1) Weighing the raw materials according to the following proportion, wherein 100 parts of light burned MgO, 50-80 parts of magnesium chloride hexahydrate, 30-50 parts of water, 0.5-5 parts of PTFE fiber and 5-10 parts of cage polysilsesquioxane; (2) Sequentially adding PTFE fiber and cage-type polysilsesquioxane into water under the stirring condition, continuously stirring for 5min until the PTFE fiber and the cage-type polysilsesquioxane are uniformly dispersed, then adding magnesium chloride hexahydrate, and continuously stirring until the magnesium chloride hexahydrate is completely dissolved to obtain a mixed solution; (3) Adding MgO weighed in the step (1) into the mixed solution obtained in the step (2) twice, wherein the interval between the two MgO additions is at least 10min, and continuously stirring for 30min after all MgO is added to obtain mixed slurry; (4) Pouring the mixed slurry obtained in the step (3) into a stainless steel mold, vibrating and trowelling, and curing to obtain the magnesium oxychloride low-carbon gel material with excellent carbonization resistance.
6. The method for preparing a magnesium oxychloride low carbon gel material according to claim 5, wherein the mass ratio of the MgO added before and after the MgO added in the step (3) is 2:1 or 1:1.
7. The method for preparing the magnesium oxychloride low carbon gel material according to claim 5, wherein the curing is specifically: and (3) placing the die after vibration trowelling in an environment with the temperature of 25 ℃ and the humidity of 50+/-5% for curing, demolding after curing for 24 hours, and then naturally curing indoors for 28 days.
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| CN102036932A (en) * | 2008-05-20 | 2011-04-27 | 保全研究与技术中心 | Durable magnesium oxychloride cement and process therefor |
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