CN112390597B - Preparation method of composite plant fiber cement board - Google Patents
Preparation method of composite plant fiber cement board Download PDFInfo
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- CN112390597B CN112390597B CN202011433826.9A CN202011433826A CN112390597B CN 112390597 B CN112390597 B CN 112390597B CN 202011433826 A CN202011433826 A CN 202011433826A CN 112390597 B CN112390597 B CN 112390597B
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- 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
- C04B28/04—Portland cements
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- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/022—Carbon
- C04B14/026—Carbon of particular shape, e.g. nanotubes
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- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/46—Rock wool ; Ceramic or silicate fibres
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- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/18—Waste materials; Refuse organic
- C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
- C04B18/248—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork from specific plants, e.g. hemp fibres
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- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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- 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
- C04B28/06—Aluminous cements
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- 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
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- 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
Abstract
The invention belongs to the technical field of building materials, and discloses a preparation method of a composite plant fiber cement board. The preparation method comprises the following steps: (1) Taking plant straw fiber, a sodium hydroxide solution and a zinc oxide solution, and stirring and mixing the plant straw fiber, the sodium hydroxide solution and the zinc oxide solution with a precooled urea solution to obtain a plant straw fiber solution; (2) Adding the activated fly ash fiber into a mixed solution of a silane coupling agent, dodecyl trimethyl ammonium chloride and PVA, and carrying out ultrasonic treatment to obtain a modified fly ash fiber; (3) Mixing the plant straw fiber solution and the modified fly ash fiber, adding an etherifying agent, urease and a calcium nitrate solution, stirring at 70-85 ℃, and adding a carboxylated carbon nanotube to obtain a modified fiber solution; (4) And (3) uniformly stirring and mixing cement, the modified fiber solution, the water reducing agent and the defoaming agent, then performing injection molding, demolding and maintaining. The invention modifies plant straw fiber and fly ash fiber, and improves the mechanical property of fiber cement board.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a preparation method of a composite plant fiber cement board.
Background
The fiber cement board is a board prepared by taking cement as a basic material and an adhesive and taking mineral fiber cement and other fibers as reinforcing materials through the processes of pulping, forming, maintaining and the like. The application range of the composite board is very wide, the thin board can be used as a ceiling material, the thin board can be used as a perforated sound-absorbing ceiling, the conventional board can be used as a wall body and/or a decorative material, an indoor partition board curtain wall lining board, a composite wall panel, an outdoor billboard, a metallurgical/electric furnace heat insulation board, an electrical power distribution cabinet, a transformer partition board and the like, and the thick board can be used as a LOFT steel structure floor board, a LOFT floor board, an outer wall heat insulation board, an outer wall hanging board and the like.
In the production process of the fiber cement board, a stirring and mixing mode is usually adopted, the fiber is coated with a layer of slurry, but when the board is stressed in use, the coated fiber is easy to slide, cannot bear the force with the base material at the same time, and the board is easy to crack. In order to prevent cracks, a certain amount of polypropylene fibers or glass fibers can be added to improve the crack resistance of the plate to a certain extent. However, the addition of polypropylene fibers or glass fibers leads to increased porosity of the contact surface between the fibers and cement, and the water absorption performance of the board is enhanced, so that the breaking strength is reduced, and the strength of the product cannot be ensured. The addition of the asbestos fiber can enable the fiber cement board to have good mechanical properties, and the asbestos fiber is widely applied to fiber cement boards, but the asbestos fiber is easy to induce lung diseases such as lung cancer and the like.
Chinese patent document CN108546029A discloses a preparation method of a composite fiber cement board, which comprises the steps of mixing microcrystalline cellulose and a sodium hydroxide solution, cooling, adding a precooled urea solution, stirring and mixing, centrifuging to prepare a microcrystalline cellulose solution, adding an etherifying agent dropwise into the microcrystalline cellulose solution, stirring at a constant temperature for reaction, cooling, adding urease and a calcium nitrate solution, continuing to react, concentrating and drying to obtain etherified microcrystalline cellulose, performing heat preservation and pressure maintenance reaction on the etherified microcrystalline cellulose and a sodium methoxide solution, cooling, adding methane chloride, performing heat preservation and pressure maintenance reaction again, concentrating under reduced pressure, drying to obtain modified microcrystalline cellulose, then mixing cement, the modified microcrystalline cellulose, a water reducing agent and a defoaming agent, performing injection molding, and maintaining to obtain the composite fiber cement board, wherein the composite fiber cement board has excellent mechanical properties. However, the process for preparing the modified fiber by the method is complex, and needs to add colorless and combustible toxic gas, namely methane chloride, and a corrosive and spontaneous flammable hazardous chemical product, namely sodium methoxide, so that the method is not suitable for industrial large-scale production.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provides a preparation method of a composite plant fiber cement board. The composite plant fiber cement board uses plant straw fibers and fly ash fibers as fiber raw materials, and the plant straw fibers and the fly ash fibers are modified, so that the compatibility of the plant straw fibers and the fly ash fibers and the bonding strength of the obtained modified fibers and a cement material are improved, and the mechanical property of the fiber cement board is further improved.
In order to achieve the purpose of the invention, the preparation method of the composite plant fiber cement board comprises the following steps:
(1) Sequentially taking 60-80 parts by weight of crushed plant straw fiber, 200-300 parts by weight of 15-23% sodium hydroxide solution and 100-150 parts by weight of 10-18% zinc oxide solution, mixing, cooling to below 0 ℃ to obtain a mixture A, precooling the urea solution to-4-0 ℃ to obtain a precooled urea solution, adding the precooled urea solution into the mixture A, and stirring and mixing to obtain a plant straw fiber solution;
(2) Immersing 40-60 parts of fly ash fiber in a sulfuric acid solution, performing ultrasonic treatment for 1-2h at 40-50 ℃, cooling to room temperature, performing suction filtration, washing, adding the obtained product into a mixed solution of 60-80 parts of silane coupling agent, dodecyl trimethyl ammonium chloride and PVA, performing ultrasonic treatment for 2-3h at 50-60 ℃, cooling to room temperature, performing suction filtration, washing, and drying to obtain a modified fly ash fiber;
(3) Mixing the plant straw fiber solution obtained in the step (1) and the modified fly ash fiber obtained in the step (2), adding 4-6 parts of etherifying agent, 0.3-0.6 part of urease and 8-20 parts of calcium nitrate solution, stirring at the constant temperature of 70-85 ℃ for 4-6 hours, adding 6-10 parts of carboxylated carbon nanotubes, and stirring again to obtain a modified fiber solution;
(4) According to the weight parts, 80-100 parts of cement, 10-15 parts of modified fiber solution, 3-5 parts of water reducing agent and 1-3 parts of defoaming agent are sequentially taken, uniformly stirred and mixed, and then subjected to injection molding, demolding and curing to obtain the composite fiber cement board.
Furthermore, the plant straw is one or more of rape straw, reed straw, cotton straw, rice straw or corn straw.
Further, the etherifying agent is one or more of 3-chloro-2-hydroxy-trimethyl ammonium chloride and 3-chloro-2-hydroxy sodium propane sulfonate.
Further, the cement is one or more of portland cement, aluminate cement and sulphoaluminate cement.
Further, the water reducing agent is one or more of sodium lignosulfonate and a polycarboxylic type water reducing agent.
Further, the defoaming agent is one or more of silicone emulsion, polydimethylsiloxane and polyoxyethylene oxypropylamine ether.
Further, the mass ratio of the silane coupling agent to the dodecyltrimethylammonium chloride to the PVA in the mixed solution of the silane coupling agent, the dodecyltrimethylammonium chloride and the PVA is 1:1-3:1-2.
Further, the silane coupling agent is one or more of a silane coupling agent KH550, a silane coupling agent KH560 and a silane coupling agent KH 570.
Compared with the prior art, the invention has the following advantages:
(1) The plant straw fiber and the fly ash fiber are raw materials obtained by recycling waste, the modified fiber obtained by using the plant straw fiber and the fly ash fiber is economic and environment-friendly, the material cost is favorably reduced, and the modification process is obviously superior to the prior art and is favorable for large-scale industrial production;
(2) According to the invention, the fly ash fiber activated by sulfuric acid is modified by using a mixed solution of a silane coupling agent, dodecyl trimethyl ammonium chloride and PVA, so that the compatibility of the fly ash fiber and plant straw fiber is improved, and the mechanical property of the material is improved;
(3) According to the invention, the modified fiber solution is obtained by further adding the carboxylated carbon nanotubes on the basis of the prior art, and the carboxylated carbon nanotubes are filled in fiber pores and are modified in a matching manner, so that the fibers are not easy to slip, and the strength of the material is improved.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention. It is to be understood that the following description is only illustrative of the present invention and is not to be construed as limiting the present invention.
The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
The indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the number clearly indicates only the singular. The technical features of the embodiments of the present invention may be combined with each other as long as they do not conflict with each other.
Example 1
A preparation method of a composite plant fiber cement board comprises the following steps:
(1) Taking 70 parts by weight of crushed plant straw fiber, 250 parts by weight of sodium hydroxide solution with the mass concentration of 18% and 125 parts by weight of zinc oxide solution with the mass concentration of 14% in sequence, mixing, cooling to below 0 ℃ to obtain a mixture A, precooling a urea solution to-2 ℃ to obtain a precooled urea solution, adding the precooled urea solution into the mixture A, and stirring and mixing to obtain a plant straw fiber solution;
(2) Immersing 50 parts of fly ash fiber in a sulfuric acid solution, performing ultrasonic treatment at 45 ℃ for 1h, cooling to room temperature, performing suction filtration, washing, adding the obtained product into a mixed solution of 70 parts of silane coupling agent KH550, dodecyl trimethyl ammonium chloride and PVA, performing ultrasonic treatment at 55 ℃ for 2h, cooling to room temperature, performing suction filtration, washing, and drying to obtain a modified fly ash fiber;
(3) Mixing the plant straw fiber solution obtained in the step (1) and the modified fly ash fiber obtained in the step (2), adding 5 parts of etherifying agent, 0.4 part of urease and 14 parts of calcium nitrate solution, stirring at the constant temperature of 77 ℃ for 5 hours, adding 8 parts of carboxylated carbon nanotubes, and stirring again to obtain a modified fiber solution;
(4) According to the weight parts, 90 parts of cement, 12 parts of modified fiber solution, 4 parts of water reducing agent and 2 parts of defoaming agent are sequentially taken, uniformly stirred and mixed, then injection molding and demolding are carried out to obtain a cement slab, and then the cement slab is naturally cured for 28 days to obtain the composite plant fiber cement board.
Wherein the plant straw is corn straw; the etherifying agent is 3-chloro-2-hydroxy-trimethyl ammonium chloride; the cement is portland cement; the water reducing agent is sodium lignosulphonate; the defoaming agent is polydimethylsiloxane; the mass ratio of the silane coupling agent KH550 to the dodecyl trimethyl ammonium chloride to the PVA in the mixed solution of the silane coupling agent KH550 and the dodecyl trimethyl ammonium chloride to the PVA is 1:2:1.5.
example 2
A preparation method of a composite plant fiber cement board comprises the following steps:
(1) According to the weight parts, sequentially taking 80 parts of crushed plant straw fiber, 300 parts of sodium hydroxide solution with the mass concentration of 23% and 150 parts of zinc oxide solution with the mass concentration of 18%, mixing, cooling to below 0 ℃ to obtain a mixture A, precooling a urea solution to-4 ℃ to obtain a precooled urea solution, adding the precooled urea solution into the mixture A, and stirring and mixing to obtain a plant straw fiber solution;
(2) Immersing 60 parts of fly ash fiber in a sulfuric acid solution, performing ultrasonic treatment at 50 ℃ for 1h, cooling to room temperature, performing suction filtration, washing, adding into a mixed solution of 80 parts of silane coupling agent KH560, dodecyl trimethyl ammonium chloride and PVA, performing ultrasonic treatment at 60 ℃ for 2h, cooling to room temperature, performing suction filtration, washing, and drying to obtain a modified fly ash fiber;
(3) Mixing the plant straw fiber solution obtained in the step (1) and the modified fly ash fiber obtained in the step (2), adding 6 parts of etherifying agent, 0.6 part of urease and 20 parts of calcium nitrate solution, stirring at the constant temperature of 85 ℃ for 6 hours, adding 10 parts of carboxylated carbon nanotubes, and stirring again to obtain a modified fiber solution;
(4) And (2) taking 100 parts of cement, 15 parts of modified fiber solution, 5 parts of water reducing agent and 3 parts of defoaming agent in sequence according to parts by weight, uniformly stirring and mixing, then carrying out injection molding, demolding to obtain a cement slab, and naturally curing the cement slab for 28 days to obtain the composite plant fiber cement board.
Wherein the plant straw is rape straw; the etherifying agent is 3-chloro-2-hydroxypropanesulfonic acid sodium salt; the cement is sulphoaluminate cement; the water reducing agent is a TH-928 polycarboxylic water reducing agent; the defoaming agent is emulsified silicone oil; the mass ratio of the silane coupling agent KH560 to the dodecyl trimethyl ammonium chloride to the PVA in the mixed solution of the silane coupling agent KH560 to the dodecyl trimethyl ammonium chloride to the PVA is 1:3:2.
example 3
A preparation method of a composite plant fiber cement board comprises the following steps:
(1) Taking 60 parts by weight of crushed plant straw fiber, 200 parts by weight of 15% sodium hydroxide solution and 100 parts by weight of 10% zinc oxide solution in sequence, mixing, cooling to below 0 ℃ to obtain a mixture A, precooling the urea solution to 0 ℃ to obtain a precooled urea solution, adding the precooled urea solution into the mixture A, and stirring and mixing to obtain a plant straw fiber solution;
(2) Immersing 40 parts of fly ash fiber in a sulfuric acid solution, performing ultrasonic treatment at 40 ℃ for 2h, cooling to room temperature, performing suction filtration, washing, adding the obtained product into a mixed solution of 60 parts of silane coupling agent KH570, dodecyl trimethyl ammonium chloride and PVA, performing ultrasonic treatment at 60 ℃ for 3h, cooling to room temperature, performing suction filtration, washing, and drying to obtain a modified fly ash fiber;
(3) Mixing the plant straw fiber solution obtained in the step (1) and the modified fly ash fiber obtained in the step (2), adding 4 parts of etherifying agent, 0.3 part of urease and 8 parts of calcium nitrate solution, stirring at the constant temperature of 70 ℃ for 4 hours, adding 6 parts of carboxylated carbon nanotube, and stirring again to obtain a modified fiber solution;
(4) According to the weight parts, 80 parts of cement, 10 parts of modified fiber solution, 3 parts of water reducing agent and 1 part of defoaming agent are sequentially taken, uniformly stirred and mixed, then injection molding and demolding are carried out to obtain a cement slab, and then the cement slab is naturally cured for 28 days to obtain the composite plant fiber cement board.
Wherein the plant straw is cotton straw; the etherifying agent is 3-chloro-2-hydroxypropanesulfonic acid sodium salt; the cement is portland cement; the water reducing agent is sodium lignosulphonate; the defoaming agent is polyoxyethylene oxypropylamine ether; the mass ratio of the silane coupling agent KH570 to the dodecyl trimethyl ammonium chloride to the PVA in the mixed solution of the silane coupling agent KH570 and the dodecyl trimethyl ammonium chloride to the PVA is 1:1-3:1-2.
Comparative example 1
A preparation method of a composite plant fiber cement board comprises the following steps:
(1) According to the weight parts, sequentially taking 70 parts of crushed plant straw fiber, 250 parts of sodium hydroxide solution with the mass concentration of 18% and 125 parts of zinc oxide solution with the mass concentration of 14%, mixing, cooling to below 0 ℃ to obtain a mixture A, precooling a urea solution to-2 ℃ to obtain a precooled urea solution, adding the precooled urea solution into the mixture A, and stirring and mixing to obtain a plant straw fiber solution;
(2) Immersing 50 parts of fly ash fiber in a sulfuric acid solution, performing ultrasonic treatment at 45 ℃ for 1h, cooling to room temperature, performing suction filtration, washing, adding into 70 parts of silane coupling agent KH550 solution, performing ultrasonic treatment at 55 ℃ for 2h, cooling to room temperature, performing suction filtration, washing, and drying to obtain a modified fly ash fiber;
(3) Mixing the plant straw fiber solution obtained in the step (1) and the modified fly ash fiber obtained in the step (2), adding 5 parts of etherifying agent, 0.4 part of urease and 14 parts of calcium nitrate solution, stirring at the constant temperature of 77 ℃ for 5 hours, adding 8 parts of carboxylated carbon nanotube, and stirring again to obtain a modified fiber solution;
(4) According to the weight parts, 90 parts of cement, 12 parts of modified fiber solution, 4 parts of water reducing agent and 2 parts of defoaming agent are sequentially taken, uniformly stirred and mixed, then injection molding and demolding are carried out to obtain a cement slab, and then the cement slab is naturally cured for 28 days to obtain the composite plant fiber cement board.
Wherein the plant straw is corn straw; the etherifying agent is 3-chlorine-2-hydroxyl-trimethyl ammonium chloride; the cement is portland cement; the water reducing agent is sodium lignosulphonate; the defoaming agent is polydimethylsiloxane.
Comparative example 2
A preparation method of a composite plant fiber cement board comprises the following steps:
(1) Taking 70 parts by weight of crushed plant straw fiber, 250 parts by weight of sodium hydroxide solution with the mass concentration of 18% and 125 parts by weight of zinc oxide solution with the mass concentration of 14% in sequence, mixing, cooling to below 0 ℃ to obtain a mixture A, precooling a urea solution to-2 ℃ to obtain a precooled urea solution, adding the precooled urea solution into the mixture A, and stirring and mixing to obtain a plant straw fiber solution;
(2) Immersing 50 parts of fly ash fiber in a sulfuric acid solution, performing ultrasonic treatment at 45 ℃ for 1h, cooling to room temperature, performing suction filtration, washing, adding the obtained product into a mixed solution of 70 parts of silane coupling agent KH550, dodecyl trimethyl ammonium chloride and PVA, performing ultrasonic treatment at 55 ℃ for 2h, cooling to room temperature, performing suction filtration, washing, and drying to obtain a modified fly ash fiber;
(3) Mixing the plant straw fiber solution obtained in the step (1) and the modified fly ash fiber obtained in the step (2), adding 5 parts of etherifying agent, 0.4 part of urease and 14 parts of calcium nitrate solution, and stirring at the constant temperature of 77 ℃ for 5 hours to obtain a modified fiber solution;
(4) According to the weight parts, sequentially taking 90 parts of cement, 12 parts of modified fiber solution, 4 parts of water reducing agent and 2 parts of defoaming agent, stirring and mixing uniformly, then performing injection molding and demolding to obtain a cement slab, and then naturally curing the cement slab for 28 days to obtain the composite plant fiber cement board.
Wherein the plant straw is corn straw; the etherifying agent is 3-chlorine-2-hydroxyl-trimethyl ammonium chloride; the cement is portland cement; the water reducing agent is sodium lignosulphonate; the defoaming agent is polydimethylsiloxane; the mass ratio of the silane coupling agent KH550 to the dodecyl trimethyl ammonium chloride to the PVA in the mixed solution of the silane coupling agent KH550 and the dodecyl trimethyl ammonium chloride to the PVA is 1:2:1.5.
the composite plant fiber cement boards obtained in examples 1 to 3 and comparative examples 1 to 2 were subjected to performance tests, and the test results are shown in the following table, wherein the flexural strength and the elastic modulus were measured in accordance with GB/T7019.
| Test item | Flexural strength/Mpa | Modulus of elasticity/MPa |
| Example 1 | 36.9 | 14685 |
| Example 2 | 37.1 | 14237 |
| Example 3 | 36.8 | 14316 |
| Comparative example 1 | 25.4 | 10898 |
| Comparative example 2 | 29.1 | 11973 |
It will be understood by those skilled in the art that the foregoing is only exemplary of the present invention, and is not intended to limit the invention, which is intended to cover any variations, equivalents, or improvements therein, which fall within the spirit and scope of the invention.
Claims (7)
1. The preparation method of the composite plant fiber cement board is characterized by comprising the following steps of:
(1) Sequentially taking 60-80 parts by weight of crushed plant straw fiber, 200-300 parts by weight of 15-23% sodium hydroxide solution and 100-150 parts by weight of 10-18% zinc oxide solution, mixing, cooling to below 0 ℃ to obtain a mixture A, precooling the urea solution to-4-0 ℃ to obtain a precooled urea solution, adding the precooled urea solution into the mixture A, and stirring and mixing to obtain a plant straw fiber solution;
(2) Immersing 40-60 parts of fly ash fiber in a sulfuric acid solution, performing ultrasonic treatment for 1-2h at 40-50 ℃, cooling to room temperature, performing suction filtration, washing, adding into a mixed solution of 60-80 parts of silane coupling agent, dodecyl trimethyl ammonium chloride and PVA, performing ultrasonic treatment for 2-3h at 50-60 ℃, cooling to room temperature, performing suction filtration, washing, and drying to obtain a modified fly ash fiber;
(3) Mixing the plant straw fiber solution obtained in the step (1) and the modified fly ash fiber obtained in the step (2), adding 4-6 parts of etherifying agent, 0.3-0.6 part of urease and 8-20 parts of calcium nitrate solution, stirring at the constant temperature of 70-85 ℃ for 4-6 hours, adding 6-10 parts of carboxylated carbon nanotubes, and stirring again to obtain a modified fiber solution;
(4) According to the weight parts, sequentially taking 80-100 parts of cement, 10-15 parts of modified fiber solution, 3-5 parts of water reducing agent and 1-3 parts of defoaming agent, stirring and mixing uniformly, then performing injection molding, demolding and maintaining to obtain the composite fiber cement board;
the mass ratio of the silane coupling agent to the dodecyl trimethyl ammonium chloride to the PVA in the mixed solution of the silane coupling agent, the dodecyl trimethyl ammonium chloride and the PVA is 1:1-3:1-2.
2. The method of claim 1, wherein the plant stalks are one or more of rape stalks, reed stalks, cotton stalks, rice stalks or corn stalks.
3. The method of claim 1, wherein the etherifying agent is one or more of 3-chloro-2-hydroxy-trimethyl ammonium chloride and sodium 3-chloro-2-hydroxypropanesulfonate.
4. The method for preparing a composite plant fiber cement board according to claim 1, wherein the cement is one or more of portland cement, aluminate cement and sulphoaluminate cement.
5. The method for preparing the composite plant fiber cement board as claimed in claim 1, wherein the water reducing agent is one or more of sodium lignosulfonate and polycarboxylic type water reducing agent.
6. The method for preparing a composite plant fiber cement board according to claim 1, wherein the antifoaming agent is one or more of silicone emulsion, polydimethylsiloxane and polyoxyethylene oxypropylamine ether.
7. The method for preparing a composite plant fiber cement board as claimed in claim 1, wherein the silane coupling agent is one or more of a silane coupling agent KH550, a silane coupling agent KH560 and a silane coupling agent KH 570.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011433826.9A CN112390597B (en) | 2020-12-10 | 2020-12-10 | Preparation method of composite plant fiber cement board |
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