CN114394808A - Mineralized composite fiber cement board and preparation method and application thereof - Google Patents
Mineralized composite fiber cement board and preparation method and application thereof Download PDFInfo
- Publication number
- CN114394808A CN114394808A CN202210115725.XA CN202210115725A CN114394808A CN 114394808 A CN114394808 A CN 114394808A CN 202210115725 A CN202210115725 A CN 202210115725A CN 114394808 A CN114394808 A CN 114394808A
- Authority
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- China
- Prior art keywords
- cement board
- fiber
- fiber cement
- mineralized
- acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000835 fiber Substances 0.000 title claims abstract description 102
- 239000004568 cement Substances 0.000 title claims abstract description 68
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 33
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 24
- 230000033558 biomineral tissue development Effects 0.000 claims abstract description 17
- 230000004048 modification Effects 0.000 claims abstract description 17
- 238000012986 modification Methods 0.000 claims abstract description 17
- 229920003043 Cellulose fiber Polymers 0.000 claims description 64
- 239000000843 powder Substances 0.000 claims description 53
- 239000000725 suspension Substances 0.000 claims description 30
- 239000002893 slag Substances 0.000 claims description 29
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 27
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 25
- 235000012241 calcium silicate Nutrition 0.000 claims description 24
- 239000000378 calcium silicate Substances 0.000 claims description 20
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 20
- 239000003377 acid catalyst Substances 0.000 claims description 19
- 239000012209 synthetic fiber Substances 0.000 claims description 17
- 229920002994 synthetic fiber Polymers 0.000 claims description 17
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 16
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 16
- 239000011707 mineral Substances 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 239000000654 additive Substances 0.000 claims description 14
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 13
- 239000011777 magnesium Substances 0.000 claims description 13
- 229910052749 magnesium Inorganic materials 0.000 claims description 13
- 239000003607 modifier Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 13
- 239000002002 slurry Substances 0.000 claims description 13
- 238000012423 maintenance Methods 0.000 claims description 11
- 230000003068 static effect Effects 0.000 claims description 11
- 235000019738 Limestone Nutrition 0.000 claims description 10
- 230000000996 additive effect Effects 0.000 claims description 10
- 239000006028 limestone Substances 0.000 claims description 10
- 239000010451 perlite Substances 0.000 claims description 10
- 235000019362 perlite Nutrition 0.000 claims description 10
- 229910021487 silica fume Inorganic materials 0.000 claims description 10
- 239000012298 atmosphere Substances 0.000 claims description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- 150000007524 organic acids Chemical class 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- XYRAEZLPSATLHH-UHFFFAOYSA-N trisodium methoxy(trioxido)silane Chemical compound [Na+].[Na+].[Na+].CO[Si]([O-])([O-])[O-] XYRAEZLPSATLHH-UHFFFAOYSA-N 0.000 claims description 5
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 4
- ARHMMDOXGIIARL-UHFFFAOYSA-N calcium;dihydroxy(dioxido)silane Chemical compound [Ca+2].O[Si](O)([O-])[O-] ARHMMDOXGIIARL-UHFFFAOYSA-N 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims description 3
- FZVXUPLDQNBUQZ-UHFFFAOYSA-N [Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])([O-])O[Si]([O-])([O-])[O-] Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])([O-])O[Si]([O-])([O-])[O-] FZVXUPLDQNBUQZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000004310 lactic acid Substances 0.000 claims description 3
- 235000014655 lactic acid Nutrition 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 14
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 229920006395 saturated elastomer Polymers 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 description 23
- 239000007789 gas Substances 0.000 description 16
- 238000005507 spraying Methods 0.000 description 14
- 239000000463 material Substances 0.000 description 13
- 239000000243 solution Substances 0.000 description 13
- 239000000203 mixture Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 238000000967 suction filtration Methods 0.000 description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 239000000292 calcium oxide Substances 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
- 239000002440 industrial waste Substances 0.000 description 5
- 239000000376 reactant Substances 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910052681 coesite Inorganic materials 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 239000000395 magnesium oxide Substances 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 229910052682 stishovite Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 238000005034 decoration Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- -1 10.73% of MgO10 Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 125000004185 ester group Chemical group 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 235000019976 tricalcium silicate Nutrition 0.000 description 2
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000001089 mineralizing effect Effects 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
- C04B28/082—Steelmaking slags; Converter slags
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0231—Carbon dioxide hardening
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/49—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes
- C04B41/4905—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon
- C04B41/4922—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon applied to the substrate as monomers, i.e. as organosilanes RnSiX4-n, e.g. alkyltrialkoxysilane, dialkyldialkoxysilane
- C04B41/4927—Alkali metal or ammonium salts
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/62—Coating or impregnation with organic materials
- C04B41/64—Compounds having one or more carbon-to-metal of carbon-to-silicon linkages
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F13/00—Coverings or linings, e.g. for walls or ceilings
- E04F13/07—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor
- E04F13/08—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements
- E04F13/14—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements stone or stone-like materials, e.g. ceramics concrete; of glass or with an outer layer of stone or stone-like materials or glass
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F13/00—Coverings or linings, e.g. for walls or ceilings
- E04F13/07—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor
- E04F13/08—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements
- E04F13/14—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements stone or stone-like materials, e.g. ceramics concrete; of glass or with an outer layer of stone or stone-like materials or glass
- E04F13/141—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements stone or stone-like materials, e.g. ceramics concrete; of glass or with an outer layer of stone or stone-like materials or glass with an outer layer of concrete
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a mineralized composite fiber cement board and a preparation method and application thereof, belonging to the technical field of building materials. The invention adopts hydrophobic modification of fiber surface and CO on the fiber surface2The multiple hydrophobic moisture-proof method of mineralization blocking and product surface protection can greatly reduce the water absorption of the fiber cement board, improve the mechanical property of the fiber cement board after being saturated with water, effectively solve the problem of mechanical and durability reduction of the fiber cement board caused by high water absorption, and prolong the service life of the fiber cement board in a high-humidity environment.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a mineralized composite fiber cement board and a preparation method and application thereof.
Background
A fiber cement board is a composite material mainly composed of an adhesive and other toughness-enhancing materials such as plant fibers, and is generally obtained by laminating several tens of layers of slurry by a sheet-making method. The traditional fiber cement board provides strength by solidifying toughness reinforcing materials such as plant fibers and the like through hydration reaction of common silicate cement, and is widely applied in the fields of indoor suspended ceilings, inner and outer wall boards, decoration, heat preservation, movable houses and the like.
However, the conventional fiber cement board has high water absorption rate and poor water resistance due to plant fibers, and is easy to absorb water and swell when being used in a humid environment, so that the interlayer bonding of the fiber cement board is weakened, the mechanical property and the durability of the fiber cement board are reduced, and the application of the fiber cement board in outdoor and humid environments is severely limited.
Disclosure of Invention
The invention aims to provide a mineralized composite fiber cement board, and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a mineralized composite fiber cement board, which comprises the following steps:
mixing cellulose fibers, a modifier and an acid catalyst, and modifying to obtain modified cellulose fibers; the modifying agent comprises a water-soluble organic acid;
dispersing the modified cellulose fibers and the organic synthetic fibers in water to obtain a fiber suspension;
mixing the fiber suspension, the mineralized gel component and water, sequentially dehydrating, pressing and statically maintaining the obtained slurry, and placing the obtained plate blank in CO2Carrying out mineralization maintenance under the atmosphere to obtain a fiber cement board;
and coating a hydrophobic component on the surface of the fiber cement board to obtain the mineralized composite fiber cement board.
Preferably, the water-soluble organic acid comprises one or more of acetic acid, lactic acid, sulfonic acid and citric acid; the mass of the modifier is 8-20 times of that of the cellulose fiber; the acid catalyst comprises one or more of sulfuric acid, phosphoric acid and hydrochloric acid; the mass of the acid catalyst is 5-10% of the mass of the cellulose fiber.
Preferably, the modification temperature is 40-60 ℃, the modification time is 25-50 min, and the heating rate of heating to the modification temperature is 0.5-2 ℃/min.
Preferably, the length of the cellulose fiber is 1-5 mm; the organic synthetic fiber comprises one or more of PVA, PE and PP fiber.
Preferably, the mineralized gelling component comprises one or more of calcium silicate mineral powder, steel slag powder containing a calcium silicate phase and magnesium slag powder containing the calcium silicate phase, and the particle size of the mineralized gelling component is less than 50 μm; the calcium silicate mineral powder comprises one or more of gamma-type dicalcium silicate, monocalcium silicate and tricalcium disilicate; the mass ratio of the mineralized gelling component to the total mass of the modified cellulose fibers and the organic synthetic fibers is (55-75) to (4-8).
Preferably, the slurry also comprises an additive, wherein the additive comprises one or more of expanded perlite, silica fume, limestone powder and shell powder; the mass ratio of the mineralized gelling component to the additive is (55-75): (17-41).
Preferably, the pressure of the grouting is 300-850 kN, and the pressure maintaining time is 45-60 s; the temperature of the static culture is 40-50 ℃, the relative humidity is less than or equal to 50%, and the time is 1-4 h; the temperature of the mineralization maintenance is 5-90 ℃, the relative humidity is 30-80%, the air pressure is 0.05-0.3 MPa, and the time is 2-48 h.
Preferably, the hydrophobic component comprises one or more of sodium methyl silicate, polyurethane and acrylate.
The invention provides the mineralized composite fiber cement board prepared by the preparation method in the technical scheme.
The invention provides the application of the mineralized composite fiber cement board in the technical scheme in an outdoor decorative board.
The invention provides a preparation method of a mineralized composite fiber cement board, which comprises the following steps: mixing cellulose fibers, a modifier and an acid catalyst, and modifying to obtain modified cellulose fibers; the modifying agent comprises a water-soluble organic acid; dispersing the modified cellulose fibers and the organic synthetic fibers in water to obtain a fiber suspension; mixing the fiber suspension, the mineralized gelling component and water, and feeding the obtained slurry into a reactor in sequenceDewatering, pressing and standing, and placing the obtained plate blank in CO2Carrying out mineralization maintenance under the atmosphere to obtain a fiber cement board; and coating a hydrophobic component on the surface of the fiber cement board to obtain the mineralized composite fiber cement board. The invention utilizes the reaction of carboxyl of a modifier and hydrophilic groups of cellulose fibers to form hydrophobic groups (ester groups), thus reducing the water absorption of the fibers from the root; CO with mineralised cementitious material2Reactivity with CO2The carbon mineralization reaction is carried out, a mineralization product which mainly comprises calcium carbonate is formed and is wrapped on the surface of the cellulose fiber, and the invasion of environmental moisture into the fiber cement board is effectively prevented; and then coating a hydrophobic component on the surface of the fiber to form a hydrophobic film on the surface of the fiber cement board, thereby further reducing the water absorption of the fiber cement board. The invention adopts hydrophobic modification of fiber surface and CO on the fiber surface2The multiple hydrophobic moisture-proof method of mineralization blocking and product surface protection can greatly reduce the water absorption of the fiber cement board, improve the mechanical property of the fiber cement board after being saturated with water, effectively solve the problem of mechanical and durability reduction of the fiber cement board caused by high water absorption, and prolong the service life of the fiber cement board in a high-humidity environment.
The method has simple principle and obvious effect, can obviously improve the water resistance of the fiber cement board without reducing the mechanical property, and further converts the hydration reaction and consolidation of the cement into CO in the preparation method of the fiber cement board2Carbon mineralization consolidation, the water absorption of the plant fiber can be blocked by coating the carbon mineralization product on the surface of the plant fiber, and the CO can be utilized in large quantity2The greenhouse gas or the industrial tail gas has wide application prospect.
Detailed Description
The invention provides a preparation method of a mineralized composite fiber cement board, which comprises the following steps:
mixing cellulose fibers, a modifier and an acid catalyst, and modifying to obtain modified cellulose fibers; the modifying agent comprises a water-soluble organic acid;
dispersing the modified cellulose fibers and the organic synthetic fibers in water to obtain a fiber suspension;
mixing the fiber suspension, the mineralized gel component and water, sequentially dehydrating, pressing and statically maintaining the obtained slurry, and placing the obtained plate blank in CO2Carrying out mineralization maintenance under the atmosphere to obtain a fiber cement board;
and coating a hydrophobic component on the surface of the fiber cement board to obtain the mineralized composite fiber cement board.
In the present invention, unless otherwise specified, all the starting materials required for the preparation are commercially available products well known to those skilled in the art.
The invention mixes cellulose fiber, modifier and acid catalyst to modify, and obtains modified cellulose fiber.
In the present invention, the length of the cellulose fiber is preferably 1 to 5mm, and more preferably 3 mm.
In the present invention, the modifying agent comprises a water-soluble organic acid, preferably comprising one or more of acetic acid, lactic acid, sulfonic acid and citric acid; when the water-soluble organic acid includes two or more of the above, the present invention does not specifically limit the ratio of the different water-soluble organic acids, and any ratio may be used. In the present invention, the mass of the modifier is preferably 8 to 20 times the mass of the cellulose fiber.
In the present invention, the acid catalyst preferably comprises one or more of sulfuric acid, phosphoric acid and hydrochloric acid; when the acid catalyst comprises more than two of the acid catalysts, the proportion of the acid catalysts of different types is not specially limited, and the acid catalysts can be mixed at any proportion; the mass of the acid catalyst is 5-10% of the mass of the cellulose fiber, and more preferably 6-8%. In the invention, the mass fraction of the sulfuric acid is preferably 60-75%, more preferably 70%, and the mass fraction of the phosphoric acid is preferably 75-90%; the mass fraction of the hydrochloric acid is preferably 30-40%.
In the present invention, the mixing of the cellulose fibers, the modifying agent and the acid catalyst preferably includes dispersing the cellulose fibers in a part of the modifying agent to obtain a cellulose fiber suspension, and adding a mixture of the acid catalyst and the remaining modifying agent to the cellulose fiber suspension while stirring. In the invention, the mass fraction of the cellulose fibers in the cellulose fiber suspension is preferably 10-20%, and more preferably 15%; the mass of the residual modifier is 2-8 times, and more preferably 6 times of the mass of the cellulose fiber. The stirring rate is not particularly limited in the present invention, and the materials are uniformly mixed according to a process well known in the art. The invention can fully disperse the cellulose fiber by adding the modifier twice, and then utilizes the acid catalyst to catalyze the modification process.
After the cellulose fibers, the modifier and the acid catalyst are mixed, the obtained reactant solution is stirred and heated under the condition of a water bath kettle for modification; the heating rate of heating to the modification temperature is preferably 0.5-2 ℃/min, and more preferably 1 ℃/min; the modification temperature is preferably 40-60 ℃, and more preferably 50 ℃; the time is preferably 25 to 50min, and more preferably 30 min. The stirring rate is not particularly limited in the present invention, and the reaction can be carried out smoothly according to the procedures known in the art.
In the modification process, carboxyl in the modifier reacts with hydroxyl in the cellulose fiber, and the original hydrophilic hydroxyl in the cellulose fiber structure is replaced by hydrophobic ester group, so that the aim of hydrophobic modification is fulfilled, and the water absorption of the cellulose fiber is reduced.
After the modification is completed, the obtained product is preferably washed and filtered by using ethanol in sequence, and then washed and filtered by using acetone in sequence to obtain the modified cellulose fiber. The washing and suction filtration process is not particularly limited in the present invention, and may be carried out according to a process well known in the art.
After the modified cellulose fiber is obtained, the modified cellulose fiber and the organic synthetic fiber are dispersed in water to obtain a fiber suspension. In the present invention, the organic synthetic fibers preferably include one or more of PVA, PE, and PP fibers; when the organic synthetic fibers comprise more than two of the organic synthetic fibers, the proportion of the organic synthetic fibers of different types is not particularly limited, and the organic synthetic fibers can be prepared in any proportion.
In the invention, the mass ratio of the modified cellulose fibers to the organic synthetic fibers is not particularly limited and can be adjusted according to actual requirements; the mass concentration of the fiber suspension is not particularly limited, and the uniformly dispersed suspension can be obtained. The process of dispersion is not particularly limited in the present invention, and a uniformly dispersed suspension is obtained according to a process well known in the art, and in the embodiment of the present invention, the suspension is formed by stirring in a stirring device; the stirring rate is not particularly limited in the present invention, and the materials are uniformly mixed according to a process well known in the art.
According to the invention, the organic synthetic fibers are added into the cellulose fibers, so that the reduction of the mechanical property of the fiber cement board caused by the water absorption and expansion of the cellulose fibers can be reduced.
After obtaining the fiber suspension, the invention mixes the fiber suspension, the mineralized gel component and water, and carries out dehydration, pulp pressing and static curing on the obtained slurry in sequence, and the obtained plate blank is placed in CO2And carrying out mineralization maintenance in the atmosphere to obtain the fiber cement board. In the present invention, the mineralizing and gelling component preferably includes one or more of calcium silicate mineral powder including gamma-dicalcium silicate (gamma-C), steel slag powder containing a calcium silicate phase, and magnesium slag powder containing a calcium silicate phase2S), monocalcium silicate (CS) and tricalcium disilicate (C)3S2) One or more of the above; when the mineralized gelling components are more than two of the above components, the proportion of different types of gelling components is not specially limited, and any proportion can be adopted; when the calcium silicate mineral powder is more than two of the calcium silicate mineral powder, the proportion of different types of calcium silicate mineral powder is not specially limited, and the calcium silicate mineral powder can be prepared in any proportion. The mineralized gelling component used in the present invention has excellent CO2Reactive with CO2The carbon mineralization reaction is carried out to form a matrix structure which takes calcium carbonate as a component and is the main strength source of the fiber cement board.
In the present invention, the composition of the mineral phase of the slag powder containing a calcium silicate mineral phase preferably includes gamma-dicalcium silicate, RO phase, calcium ferrite, tricalcium silicate, free calcium oxide and free magnesium oxide, wherein silicic acidThe total mass content of dicalcium and tricalcium silicate in the steel slag powder is preferably>40 percent; the source of the calcium silicate mineral phase-containing steel slag powder is not particularly limited in the present invention, and any steel slag powder containing a calcium silicate mineral phase having the above composition, which is known in the art, may be used. In the present invention, the mineral phase composition of the magnesium slag powder containing calcium silicate mineral phase preferably includes gamma-dicalcium silicate, beta-dicalcium silicate and magnesium oxide, wherein the total mass content of dicalcium silicate in the magnesium slag powder is preferably>50 percent. The source of the calcium silicate mineral phase-containing magnesium slag powder is not particularly limited in the present invention, and any magnesium slag powder having the above composition, which is known in the art, may be used. In the embodiment of the invention, the chemical composition of the steel slag powder comprises, by mass percentage, 41.77% of CaO, 10.73% of MgO10, and SiO29.8％，Al2O32.55％，Fe2O329.24 percent; in the chemical composition of the magnesium slag powder, SiO is calculated by mass percentage228.87％，Fe2O38.17％，CaO 53.86％，MgO 7.24％
In the present invention, the particle size of the mineralised gelling component is preferably < 50 μm; the mass ratio of the mineralized gelling component to the total mass of the modified cellulose fibers and the organic synthetic fibers is preferably (55-75): (4-8), and more preferably (60-70): (6-8).
In the invention, during the mixing process of the fiber suspension, the mineralized gelling component and the water, additives are preferably further added, and the additives preferably comprise one or more of expanded perlite, silica fume, limestone powder and shell powder; the mass ratio of the expanded perlite, the silica fume, the limestone powder and the shell powder is preferably (0-10): 4-8): 10-20): 5-10, and more preferably (5-10): 6-8): 15-20): 8-10; the particle size of the expanded perlite is preferably 50-300 mu m; the particle size of the silica fume is preferably 0.2-5 mu m and SiO2The mass content is more than or equal to 90%, the particle size of the limestone powder is preferably 10-20 microns, and the particle size of the shell powder is preferably 10-100 microns. The invention utilizes the additive to improve the pulp wrapping performance of the pulp and the density of the plate blank, and simultaneously reduces the material cost.
In the invention, the mass ratio of the mineralized gelling component to the additive is preferably (55-75): (17-41), more preferably (60-70): (17-34).
In the invention, the process of mixing the fiber suspension, the mineralized gel component, the additive and water comprises the steps of stirring and mixing the mineralized gel component and the additive in a stirring device for 15min to obtain a mixed material; and (3) placing the fiber suspension, the mixed material and water into a beating machine, and stirring for 10min to obtain slurry. In the present invention, the mass concentration of the slurry is preferably 10 to 20%, and more preferably 15%. The stirring rate is not particularly limited in the present invention, and the materials are uniformly mixed according to a process well known in the art. The stirring device and the beater are not particularly limited in the present invention, and corresponding devices well known in the art may be used.
After the process of mixing the fiber suspension, the mineralized gel component, the additive and the water is completed, the invention carries out dehydration, mud jacking and static maintenance on the obtained slurry in sequence. In the present invention, the dewatering mode is preferably suction filtration, and the specific process of the suction filtration is not particularly limited, and may be performed according to a process well known in the art. The invention has no special limit on the water content of the dehydrated plate blank, and the plate blank is filtered until no obvious water flow flows out.
In the present invention, the grouting is preferably carried out in a grouting mould; the invention has no special limitation on the grouting mould, and the grouting mould can be prepared by corresponding equipment well known in the field; the pressure of the grouting is preferably 300-850 kN, more preferably 600-800 kN, and the pressure maintaining time is preferably 45-60 s, more preferably 50-55 s.
In the invention, the temperature of the static culture is preferably 40-50 ℃, the relative humidity is preferably less than or equal to 50%, and the time is preferably 1-4 h, and more preferably 3 h. After the rest is completed, the mass ratio of water to solids in the resulting mat is preferably 0.1: 1. In the present invention, the static curing treatment is preferably performed in a curing box, and the curing box is not particularly limited in the present invention, and any curing box known in the art can achieve the above conditions.
After the static curing is finished, the obtained plate blank is placed in CO2Carrying out mineralization maintenance under the atmosphere to obtain a fiber cement board; the mineralization curing temperature is preferably 5-90 ℃, and more preferably 40-80 ℃; the relative humidity is preferably 30-80%, and more preferably 50-60%; the air pressure is preferably 0.05-0.3 MPa, and more preferably 0.2 MPa; the time is preferably 2 to 48 hours, and more preferably 12 to 24 hours.
In the present invention, the CO is2CO for atmosphere2The source of the gas is preferably CO-rich2Or preferably high concentration CO enriched from various industrial waste gases2A gas; the invention aims at the CO enrichment2And CO in the industrial kiln tail gas2The content is not particularly limited, and may be obtained as industrial kiln exhaust gas in a manner well known in the art.
The type and source of the industrial waste gas are not particularly limited in the present invention, and can be obtained in a manner well known in the art. In the present invention, the high concentration of CO2The volume concentration of the gas is preferably 20-99%. The enrichment process is not particularly limited in the present invention, and the above concentration range of CO can be obtained according to the processes well known in the art2And (3) gas is used. The invention makes full use of CO-rich2The industrial kiln tail gas or high-concentration CO enriched from various industrial waste gases2Gas, has good environmental protection benefit.
After the fiber cement board is obtained, the surface of the fiber cement board is coated with a hydrophobic component to obtain the mineralized composite fiber cement board. In the present invention, the hydrophobic component preferably includes one or more of sodium methyl silicate, polyurethane, and acrylate; when the hydrophobic components are more than two of the above, the proportion of the hydrophobic components of different types is not particularly limited, and the hydrophobic components can be mixed at any proportion. In the present invention, the hydrophobic component is preferably used in the form of a solution, and the mass concentration of the solution of the hydrophobic component is preferably 35 to 70%, and more preferably 45%; the hydrophobic component is preferably used in an amount such that the spraying thickness is 0.8-1.5 mm. The invention utilizes hydrophobic components to improve the moisture resistance of the fiber cement board.
In the invention, the coating mode is preferably spraying; the spraying caliber of the spray gun for spraying is preferably 0.5-3 mm, and more preferably 2 mm; the spraying distance is preferably 15-30 cm, and more preferably 25 cm; the spraying thickness is preferably 0.8-1.5 mm, and more preferably 1.2 mm.
The invention provides the mineralized composite fiber cement board prepared by the preparation method in the technical scheme.
The invention provides the application of the mineralized composite fiber cement board in the technical scheme in an outdoor decorative board. The method of the present invention is not particularly limited, and the method may be applied according to a method known in the art.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following examples, the mineralised gelling component used had a particle size of < 50 μm; the particle size of the expanded perlite is 50-300 mu m, the particle size of the silica fume is 0.2-5 mu m and the particle size of the SiO2The mass content is more than or equal to 90 percent, the particle size of the limestone powder is 10-20 mu m, and the particle size of the shell powder is 10-100 mu m; the cellulose fiber length is 3 mm; the chemical compositions of the steel slag powder comprise, by mass percentage, 41.77% of CaO, 10.73% of MgO10, and SiO29.8％，Al2O32.55％，Fe2O329.24 percent; in the chemical composition of the magnesium slag powder, SiO is calculated by mass percentage228.87％，Fe2O38.17％，CaO 53.86％，MgO 7.24％。
Example 1
In parts by mass, gamma-C260 parts of S, steel slag powder and magnesium slag powder (gamma-C)2S: steel slag: the mass ratio of the magnesium slag is 40: 10: 10) 5 parts of expanded perlite, 6 parts of silica fume, 15 parts of limestone powder, 8 parts of shell powder and 3 parts of PVA fiber;
dispersing 3 parts of cellulose fibers in 17 parts of acetic acid to obtain a cellulose fiber suspension with the mass fraction of 15%;
adding a mixed solution of sulfuric acid (with the mass fraction of 70%) and acetic acid into the cellulose suspension while stirring to obtain a reactant solution containing cellulose fibers; the mass of the sulfuric acid is 5% of that of the cellulose fiber, and the mass of the acetic acid is 6 times of that of the cellulose fiber;
heating the reactant solution to 50 ℃ under stirring in a water bath, keeping the temperature rise rate at 1 ℃/min for 30min, modifying, washing the obtained product with ethanol, performing suction filtration, washing with acetone, and performing suction filtration to obtain modified cellulose fibers;
adding 3 parts of weighed modified cellulose fiber, 3 parts of PVA fiber and 300 parts of water into a stirring device according to a ratio, and stirring to form a suspension;
the weighed mineralized gel component (gamma-C) is mixed according to the mixture ratio2S, mixing steel slag powder and magnesium slag powder) and additives (expanded perlite, silica fume, limestone powder and shell powder) are stirred for 15min in a stirring device to obtain a mixed material;
placing the suspension and the mixed material into a pulping machine, adding water, stirring for 10min, and fully mixing to form slurry with the mass concentration of 15%;
carrying out suction filtration and dehydration on the slurry, transferring the formed plate blank into a grouting mould, and grouting at the pressure of 600kN and the pressure maintaining time of 60 s;
removing the pressed plate blank, and placing the pressed plate blank in a curing box for static curing under the static curing condition of 40 ℃, the relative humidity of 50 percent and the curing time of 3 hours until the mass ratio of water to solid is 0.1: 1;
after standing still, the obtained plate blank is placed in a reaction kettle in CO2Curing in the atmosphere at the temperature of 40 ℃, the relative humidity of 50 percent, the air pressure of 0.2MPa and the time of 12 h; CO 22The gas source is high-concentration CO enriched from industrial waste gas2Gas, CO2The volume concentration is 99 percent;
after the maintenance is finished, obtaining a fiber cement board;
and spraying a sodium methyl silicate solution on the surface of the fiber cement board, wherein the mass concentration of the solution is 45%, the spraying caliber is 2mm, the spraying distance is 25cm, and the spraying thickness is 1.2mm, so that the mineralized composite fiber cement board is obtained.
Example 2
The only difference from example 1 is: the mineralized gelled component is gamma-C2S60 parts; the rest is the same as example 1.
Example 3
The only difference from example 1 is: the mineralized gelling component is 60 parts of steel slag; the rest is the same as example 1.
Example 4
The only difference from example 1 is: the mineralized cementing material is 60 parts of magnesium slag; the rest is the same as example 1.
Comparative example 1
In parts by mass, gamma-C260 parts of S and steel slag powder (gamma-C)2The mass ratio of S to steel slag powder is 40:20), 5 parts of expanded perlite, 6 parts of silica fume, 15 parts of limestone powder, 8 parts of shell powder, 3 parts of cellulose fiber and 3 parts of PVA fiber;
adding the weighed cellulose fibers, PVA fibers and 300 parts of water into a stirring device according to the proportion and stirring to form suspension;
the weighed mineralized gel component (gamma-C) is mixed according to the mixture ratio2S and steel slag) and additives (expanded perlite, silica fume, limestone powder and shell powder) are stirred for 15min in a stirring device to obtain a mixed material;
placing the suspension and the mixed material into a pulping machine, adding water according to the mass concentration of 15% of the pulp, stirring for 10min, and fully mixing to form pulp;
carrying out suction filtration and dehydration on the slurry, transferring the formed plate blank into a grouting mould, and grouting at the pressure of 600kN and the pressure maintaining time of 60 s;
removing the pressed plate blank, and placing the pressed plate blank in a curing box for static curing under the static curing condition of 40 ℃, the relative humidity of 50 percent and the curing time of 3 hours until the mass ratio of water to solid is 0.1: 1;
after standing still, the obtained plate blank is placed in a reaction kettle in CO2Curing under atmosphere at 40 deg.CThe humidity is 50%, the air pressure is 0.2MPa, and the time is 12 h; CO 22The gas source is high-concentration CO enriched from industrial waste gas2Gas, CO2The volume concentration is 99 percent;
and after the maintenance is finished, obtaining the fiber cement board.
Comparative example 2
The only difference from comparative example 1 is: on the basis of comparative example 1, the following steps were added: and spraying a sodium methyl silicate solution on the surface of the prepared fiber cement board, wherein the mass concentration of the solution is 45%, the spraying caliber is 2mm, the spraying distance is 25cm, and the spraying thickness is 1.2 mm.
Comparative example 3
Dispersing cellulose fibers in acetic acid to obtain a cellulose fiber suspension with the mass fraction of 15%;
adding a mixed solution of sulfuric acid (with the mass fraction of 70%) and acetic acid into the cellulose suspension while stirring to obtain a reactant solution containing cellulose fibers; the mass of the sulfuric acid is 5% of that of the cellulose fiber, and the mass of the acetic acid is 6 times of that of the cellulose;
heating the reactant solution to 50 ℃ while stirring in a water bath kettle, keeping the temperature rise rate at 1 ℃/min for 30min, washing the obtained product with ethanol, performing suction filtration, washing with acetone, and performing suction filtration to obtain modified cellulose fibers;
the modified cellulose fibers were formed into a fiber cement board according to the method of comparative example 1, and 3 parts of the cellulose fibers in comparative example 1 were replaced with 3 parts of the modified cellulose fibers.
Performance testing
The physical properties of the fiber cement boards prepared in examples 1-4 and comparative examples 1-3 were tested, and the density in a dry state, the breaking strength after 24h of water retention, and the water absorption were tested according to the method described in GB/T7019-.
TABLE 1 Performance data for fiber cement boards prepared in examples 1-4 and comparative examples 1-3
As can be seen from Table 1, compared with comparative examples 1-3, the fiber cement board prepared by the method of the invention has excellent flexural strength and low water absorption rate, which shows that the fiber cement board has excellent mechanical properties and durability, and shows that the fiber surface modification and CO of the invention are combined2The mineralization blocking and product surface protection triple hydrophobic protection technology can obviously reduce the water absorption of the fiber cement board, solve the problem of mechanical and durability performance reduction of the fiber cement board caused by high water absorption, and prolong the service life of the fiber cement board.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The preparation method of the mineralized composite fiber cement board is characterized by comprising the following steps:
mixing cellulose fibers, a modifier and an acid catalyst, and modifying to obtain modified cellulose fibers; the modifying agent comprises a water-soluble organic acid;
dispersing the modified cellulose fibers and the organic synthetic fibers in water to obtain a fiber suspension;
mixing the fiber suspension, the mineralized gel component and water, sequentially dehydrating, pressing and statically maintaining the obtained slurry, and placing the obtained plate blank in CO2Carrying out mineralization maintenance under the atmosphere to obtain a fiber cement board;
and coating a hydrophobic component on the surface of the fiber cement board to obtain the mineralized composite fiber cement board.
2. The method according to claim 1, wherein the water-soluble organic acid includes one or more of acetic acid, lactic acid, sulfonic acid, and citric acid; the mass of the modifier is 8-20 times of that of the cellulose fiber; the acid catalyst comprises one or more of sulfuric acid, phosphoric acid and hydrochloric acid; the mass of the acid catalyst is 5-10% of the mass of the cellulose fiber.
3. The method according to claim 1, wherein the temperature of the modification is 40 to 60 ℃ for 25 to 50min, and the rate of temperature increase to the temperature of the modification is 0.5 to 2 ℃/min.
4. The method according to claim 1, wherein the length of the cellulose fiber is 1 to 5 mm; the organic synthetic fiber comprises one or more of PVA, PE and PP fiber.
5. The method of claim 1, wherein the mineralized gelling component comprises one or more of calcium silicate mineral powder, steel slag powder containing a calcium silicate phase, and magnesium slag powder containing a calcium silicate phase, and the mineralized gelling component has a particle size of < 50 μm; the calcium silicate mineral powder comprises one or more of gamma-type dicalcium silicate, monocalcium silicate and tricalcium disilicate; the mass ratio of the mineralized gelling component to the total mass of the modified cellulose fibers and the organic synthetic fibers is (55-75) to (4-8).
6. The method of claim 1 or 5, further comprising an additive comprising one or more of expanded perlite, silica fume, limestone powder, and shell powder; the mass ratio of the mineralized gelling component to the additive is (55-75): (17-41).
7. The production method according to claim 1, wherein the pressure of the grouting is 300 to 850kN, and the dwell time is 45 to 60 s; the temperature of the static culture is 40-50 ℃, the relative humidity is less than or equal to 50%, and the time is 1-4 h; the temperature of the mineralization maintenance is 5-90 ℃, the relative humidity is 30-80%, the air pressure is 0.05-0.3 MPa, and the time is 2-48 h.
8. The method of claim 1, wherein the hydrophobic component comprises one or more of sodium methyl silicate, polyurethane, and acrylate.
9. The mineralized composite fiber cement board prepared by the preparation method according to any one of claims 1 to 8.
10. Use of the mineralized composite fiber cement panel according to claim 9 in exterior decorative panels.
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