CN113372050B - High-strength calcium silicate board and preparation method thereof - Google Patents
High-strength calcium silicate board and preparation method thereof Download PDFInfo
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- CN113372050B CN113372050B CN202110868404.2A CN202110868404A CN113372050B CN 113372050 B CN113372050 B CN 113372050B CN 202110868404 A CN202110868404 A CN 202110868404A CN 113372050 B CN113372050 B CN 113372050B
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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
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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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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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of plates, and discloses a high-strength calcium silicate plate and a preparation method thereof. The composition comprises the following components in parts by weight: 30-35 parts of cement, 55-65 parts of quartz sand, 4-7 parts of paper pulp and 1-4 parts of special cotton pulp; the preparation method of the high-strength calcium silicate board comprises the following steps: firstly, mixing paper pulp and special cotton pulp, and uniformly stirring to obtain prefabricated pulp; adding cement and quartz sand into the prefabricated slurry, and uniformly stirring and mixing to obtain mixed slurry; and (3) feeding the mixed slurry into a plate making machine to prepare a blank plate, putting the blank plate into a mould to be pressed and formed, and then demoulding. The calcium silicate board prepared by the invention has higher mechanical strength.
Description
Technical Field
The invention relates to the technical field of plates, in particular to a high-strength calcium silicate plate and a preparation method thereof.
Background
The building material industry generally develops towards the direction of light weight, high strength, green and environmental protection, the light weight and high strength building material can reduce the dead weight of a building and improve the anti-seismic performance, and the calcium silicate board is a novel inorganic building material, has excellent fireproof performance, moisture resistance and sound insulation effect, and is widely applied to the building engineering of developed countries in the world. The calcium silicate board can be used as a heat insulating material or a decorative material. The calcium silicate board for heat preservation is mainly used for exterior wall cladding, exterior wall poster and the like. The calcium silicate board for decoration is mainly used for suspended ceilings, house partition walls, indoor floors and the like. With the continuous expansion of the market of heat-insulating decorative finished boards, the demand of calcium silicate boards is increased.
Chinese patent publication No. CN109020340 discloses a method for preparing a calcium silicate board by using calcium silicate board leftover materials, which comprises the steps of firstly grinding granite into powder, then mixing the granite powder with saw powder, cement, water and paper pulp to obtain first prefabricated slurry, grinding the calcium silicate board leftover materials into powder, adding water for pulping to obtain calcium silicate slurry, then weighing the calcium silicate board leftover materials, adding the calcium silicate slurry into the calcium silicate slurry to obtain second prefabricated slurry, mixing the first prefabricated slurry and the second prefabricated slurry, dehydrating, preparing a board blank, cooking, maintaining and demolding. According to the technical scheme, the strength of the calcium silicate board is improved by adding the paper pulp in the preparation process of the calcium silicate board, but the improvement of the paper pulp on the strength of the calcium silicate board is limited and needs to be further improved.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a high-strength calcium silicate plate. The calcium silicate board prepared by the invention has excellent rupture strength and heat insulation performance.
The invention also provides a preparation method of the high-strength calcium silicate board.
In order to achieve the purpose, the invention adopts the following technical scheme: a high-strength calcium silicate board comprises the following components in parts by weight:
30-35 parts of cement, namely cement,
55-65 parts of quartz sand,
4-7 parts of paper pulp,
1-4 parts of special cotton pulp.
Preferably, the preparation method of the special cotton pulp comprises the following steps:
1) opening cotton and removing impurities from the cotton linter to obtain impurity-removed cotton linter;
2) mixing alkali liquor, hydrogen peroxide and water to obtain a mixed solution, pumping the mixed solution into a first double-screw extrusion impregnator, adding impurity-removing cotton linters at the same time, and carrying out extrusion impregnation to obtain extrusion impregnation slurry, wherein the current of the first double-screw extrusion impregnator is controlled at 380-420A; then the extrusion dipping slurry and the residual mixed solution react in a reaction bin for 25-35min, the temperature is controlled at 80-90 ℃, after the reaction is finished, the reacted slurry is sent into a second double-screw extrusion dipping machine for extrusion, cutting and water washing to obtain the cotton linter slurry, and the current of the second double-screw extrusion dipping machine is controlled at 420-450A;
3) feeding the cotton linter pulp into a beating machine for beating to obtain beating pulp, feeding the beating pulp into a refiner for refining to obtain refined pulp, feeding the refined pulp into a refiner for refining to obtain milled pulp, and controlling the length range of cotton pulp fibers after the milling to be 1.5-2.0 mm;
4) and (4) feeding the ground pulp into a pulp extruding machine for extruding pulp to obtain the special cotton pulp.
Preferably, the defibering current in the pulping process in the step 3) is less than 120A, and the defibering time is 12-18 min; the tapping current is less than 135A, and the tapping time is 40-60 min.
Preferably, the refining current in the refining process in the step 3) is 320-330A, and the refining time is 70-90 min.
Preferably, the refining current in the refining process in the step 3) is controlled at 220-240A, and the refining time is controlled at 60-80 min.
Preferably, the length of the pulp fibers in the pulp is in the range of 2.0-2.5 mm.
Preferably, the pulp is sulfite wood pulp.
The preparation method of the high-strength calcium silicate board comprises the following steps:
a) mixing paper pulp and special cotton pulp, and uniformly stirring to obtain prefabricated pulp;
b) adding cement and quartz sand into the prefabricated slurry, and uniformly stirring and mixing to obtain mixed slurry;
c) and (3) feeding the mixed slurry into a plate making machine to prepare a blank plate, putting the blank plate into a mould to be pressed and formed, and then demoulding to obtain the composite material.
In the prior art, the mechanical strength of the calcium silicate board is generally improved by adding paper pulp into the calcium silicate board, but the improvement of the mechanical strength of the calcium silicate board by adding the paper pulp alone is limited, and in the prior art, the defect that a single paper pulp fiber reinforces the calcium silicate board is overcome by mixing cotton pulp with the paper pulp to form mixed cotton pulp, but the paper pulp cannot be well dispersed in the calcium silicate board and bonded with materials after being mixed with common cotton pulp, a continuous reinforced grid reinforced structure cannot be formed, a part of a region of the dispersed form in the calcium silicate board often gathers a large amount of paper pulp and cotton pulp fibers, and the other region of the dispersed paper pulp and cotton pulp fibers is smaller, namely a continuously interwoven three-dimensional network structure cannot be formed in the calcium silicate board, so that the further improvement of the strength of the calcium silicate board is influenced. In order to solve the problem, sulfite wood pulp and self-made special cotton pulp are selected as reinforcing components of the calcium silicate board, the sulfite wood pulp takes the mixed solution of sulfurous acid and sulfite as a cooking agent, and the wood pulp fiber has the advantages of softness, high strength, good toughness and good interweaving performance; the surface of the self-made special cotton pulp fiber has rich burr structures, and the rich burr structures on the surface ensure that the special cotton pulp fiber has good interweaving capacity with the sulfite wood pulp fiber. The invention selects the sulfite wood pulp fiber and the self-made special cotton pulp fiber, and can form a continuous interwoven three-dimensional network structure in the calcium silicate board on the premise of controlling the lengths of the sulfite wood pulp fiber and the self-made special cotton pulp fiber (the cotton pulp fiber is 1.5-2.0mm, and the sulfite wood pulp fiber is 2.0-2.5mm), so that a complete reinforced framework is formed in the calcium silicate board, and the mechanical strength of the calcium silicate board is improved.
The preparation of the special cotton pulp is different from the prior common cotton pulp in that: 1) in the preparation process of the common cotton pulp, firstly, cotton linters and chemical assistants are mixed, cooked and removed to remove impurities such as wax, pectin, pentosan and the like in the cotton linters, alpha cellulose and partial lignin are reserved, then, the cotton pulp fibers are cut off and primary walls are damaged through steps such as pulping and the like, the fibers are subjected to devillicate and brooming, the surfaces of the fibers are fluffed, and the binding force of the fibers and other materials is improved. However, it is found through research that the steaming step is not favorable for fluffing on the surface of the cotton pulp fiber in the subsequent pulping step, so that abundant burr structures cannot be formed on the surface of the cotton pulp fiber, and the cotton pulp fiber is not favorable for interweaving with the paper pulp fiber. The invention adopts a mechanical extrusion method to replace the traditional chemical auxiliary agent for cooking to remove impurities such as wax, pectin, pentosan and the like in cotton linters, not only can not influence the fluffing on the surface of cotton pulp fibers in the subsequent steps of pulping and the like, but also increases the burr structure on the surface of the cotton pulp fibers in the extrusion process, thereby enabling the cotton pulp fibers and the paper pulp fibers to form an interwoven structure more easily.
On the other hand, the invention improves the bonding force and the interweaving force of the fiber by devillicate and brooming the fiber through beating and chopping the fiber, sends the beating material into a refiner for refining, further chops the fiber to improve the bonding force of the fiber, and finally sends the refined pulp into a refiner for refining, further improves the evenness and the interweaving force of the fiber; 2) the invention controls the technological parameters in the processes of pulping, fine pulp and pulping, and the cotton pulp fiber with the length of 1.5-2.0mm and the sulfite wood pulp fiber with the length of 2.0-2.5mm can form a continuously interwoven three-dimensional network structure.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples. In the present invention, unless otherwise specified, raw materials, equipment, and the like used are commercially available or commonly used in the art, and the methods in the examples are conventional in the art unless otherwise specified.
In the specific implementation, the paper pulp is sulfite wood pulp, and the length of the sulfite wood pulp fiber is controlled to be 2.0-2.5 mm.
Example 1
The composition comprises the following components in parts by weight:
32 parts of cement, 60 parts of quartz sand, 7 parts of paper pulp and 1 part of special cotton pulp.
The preparation method of the special cotton pulp comprises the following steps:
1) opening cotton and removing impurities from the cotton linter to obtain impurity-removed cotton linter;
2) mixing a sodium hydroxide solution, hydrogen peroxide and water according to a mass ratio of 15:6:10000 to obtain a mixed solution, pumping the mixed solution into a first double-screw extrusion impregnator, adding impurity-removing cotton linters at the same time, wherein the mass ratio of the impurity-removing cotton linters to the mixed solution is 1:10, carrying out extrusion impregnation to obtain extrusion impregnation slurry, and controlling the current of the first double-screw extrusion impregnator at 400A; then feeding the extrusion dipping slurry and the residual mixed solution into a reaction bin for reaction for 30min, controlling the temperature at 85 ℃, feeding the reacted slurry into a second double-screw extrusion dipping machine for extrusion, cutting and washing to obtain cotton linter slurry after the reaction is finished, wherein the current of the second double-screw extrusion dipping machine is controlled at 430A;
3) feeding the cotton linter pulp into a beating machine for beating, wherein the beating current is 100A and the beating time is 15 min; beating current is 120A, beating time is 50min, beating pulp is obtained, the beating pulp is sent into a refiner for refining, refining current is 325A in the refining process, refining time is 80min, refined pulp is obtained, the refined pulp is sent into a refiner for refining, refining current is controlled at 230A in the refining process, refining time is controlled at 70min, the refined pulp is obtained, and the length range of cotton pulp fibers after refining is controlled at 1.5-2.0 mm;
4) and (4) feeding the ground pulp into a pulp extruding machine for extruding pulp to obtain the special cotton pulp.
A preparation method of a high-strength calcium silicate plate comprises the following steps:
a) mixing paper pulp and special cotton pulp, and uniformly stirring to obtain prefabricated pulp;
b) adding cement and quartz sand into the prefabricated slurry, and uniformly stirring and mixing to obtain mixed slurry;
c) and (3) feeding the mixed slurry into a plate making machine to prepare a blank plate, putting the blank plate into a mould to be pressed and formed, and then demoulding to obtain the composite material.
Example 2
The composition comprises the following components in parts by weight:
32 parts of cement, 60 parts of quartz sand, 6 parts of paper pulp and 2 parts of special cotton pulp.
The preparation method of the special cotton pulp comprises the following steps:
1) opening cotton and removing impurities from the cotton linter to obtain impurity-removed cotton linter;
2) mixing a sodium hydroxide solution, hydrogen peroxide and water according to a mass ratio of 15:6:10000 to obtain a mixed solution, pumping the mixed solution into a first double-screw extrusion impregnator, adding impurity-removing cotton linters at the same time, wherein the mass ratio of the impurity-removing cotton linters to the mixed solution is 1:10, carrying out extrusion impregnation to obtain extrusion impregnation slurry, and controlling the current of the first double-screw extrusion impregnator at 400A; then feeding the extrusion dipping slurry and the residual mixed solution into a reaction bin for reaction for 30min, controlling the temperature at 85 ℃, feeding the reacted slurry into a second double-screw extrusion dipping machine for extrusion, cutting and washing to obtain cotton linter slurry after the reaction is finished, wherein the current of the second double-screw extrusion dipping machine is controlled at 430A;
3) feeding the cotton linter pulp into a beating machine for beating, wherein the beating current is 100A and the beating time is 15 min; beating current is 120A, beating time is 50min, beating pulp is obtained, the beating pulp is sent into a refiner for refining, refining current is 325A in the refining process, refining time is 80min, refined pulp is obtained, the refined pulp is sent into a refiner for refining, refining current is controlled at 230A in the refining process, refining time is controlled at 70min, the refined pulp is obtained, and the length range of cotton pulp fibers after refining is controlled at 1.5-2.0 mm;
4) and (4) feeding the ground pulp into a pulp extruding machine for extruding pulp to obtain the special cotton pulp.
A preparation method of a high-strength calcium silicate plate comprises the following steps:
a) mixing paper pulp and special cotton pulp, and uniformly stirring to obtain prefabricated pulp;
b) adding cement and quartz sand into the prefabricated slurry, and uniformly stirring and mixing to obtain mixed slurry;
c) and (3) feeding the mixed slurry into a plate making machine to prepare a blank plate, putting the blank plate into a mould to be pressed and formed, and then demoulding to obtain the composite material.
Example 3
The composition comprises the following components in parts by weight:
32 parts of cement, 60 parts of quartz sand, 5 parts of paper pulp and 3 parts of special cotton pulp.
The preparation method of the special cotton pulp comprises the following steps:
1) opening cotton and removing impurities from the cotton linter to obtain impurity-removed cotton linter;
2) mixing a sodium hydroxide solution, hydrogen peroxide and water according to a mass ratio of 15:6:10000 to obtain a mixed solution, pumping the mixed solution into a first double-screw extrusion impregnator, adding impurity-removing cotton linters at the same time, wherein the mass ratio of the impurity-removing cotton linters to the mixed solution is 1:10, carrying out extrusion impregnation to obtain extrusion impregnation slurry, and controlling the current of the first double-screw extrusion impregnator at 400A; then feeding the extrusion dipping slurry and the residual mixed solution into a reaction bin for reaction for 30min, controlling the temperature at 85 ℃, feeding the reacted slurry into a second double-screw extrusion dipping machine for extrusion, cutting and washing to obtain cotton linter slurry after the reaction is finished, wherein the current of the second double-screw extrusion dipping machine is controlled at 430A;
3) feeding the cotton linter pulp into a beating machine for beating, wherein the beating current is 100A and the beating time is 15 min; beating current is 120A, beating time is 50min, beating pulp is obtained, the beating pulp is sent into a refiner for refining, refining current is 325A in the refining process, refining time is 80min, refined pulp is obtained, the refined pulp is sent into a refiner for refining, refining current is controlled at 230A in the refining process, refining time is controlled at 70min, the refined pulp is obtained, and the length range of cotton pulp fibers after refining is controlled at 1.5-2.0 mm;
4) and (4) feeding the ground pulp into a pulp extruding machine for extruding pulp to obtain the special cotton pulp.
A preparation method of a high-strength calcium silicate plate comprises the following steps:
a) mixing paper pulp and special cotton pulp, and uniformly stirring to obtain prefabricated pulp;
b) adding cement and quartz sand into the prefabricated slurry, and uniformly stirring and mixing to obtain mixed slurry;
c) and (3) feeding the mixed slurry into a plate making machine to prepare a blank plate, putting the blank plate into a mould to be pressed and formed, and then demoulding to obtain the composite material.
Example 4
The composition comprises the following components in parts by weight:
32 parts of cement, 60 parts of quartz sand, 4 parts of paper pulp and 4 parts of special cotton pulp.
The preparation method of the special cotton pulp comprises the following steps:
1) opening cotton and removing impurities from the cotton linter to obtain impurity-removed cotton linter;
2) mixing a sodium hydroxide solution, hydrogen peroxide and water according to a mass ratio of 15:6:10000 to obtain a mixed solution, pumping the mixed solution into a first double-screw extrusion impregnator, adding impurity-removing cotton linters at the same time, wherein the mass ratio of the impurity-removing cotton linters to the mixed solution is 1:10, carrying out extrusion impregnation to obtain extrusion impregnation slurry, and controlling the current of the first double-screw extrusion impregnator at 400A; then feeding the extrusion dipping slurry and the residual mixed solution into a reaction bin for reaction for 30min, controlling the temperature at 85 ℃, feeding the reacted slurry into a second double-screw extrusion dipping machine for extrusion, cutting and washing to obtain cotton linter slurry after the reaction is finished, wherein the current of the second double-screw extrusion dipping machine is controlled at 430A;
3) feeding the cotton linter pulp into a beating machine for beating, wherein the beating current is 100A and the beating time is 15 min; beating current is 120A, beating time is 50min, beating pulp is obtained, the beating pulp is sent into a refiner for refining, refining current is 325A in the refining process, refining time is 80min, refined pulp is obtained, the refined pulp is sent into a refiner for refining, refining current is controlled at 230A in the refining process, refining time is controlled at 70min, the refined pulp is obtained, and the length range of cotton pulp fibers after refining is controlled at 1.5-2.0 mm;
4) and (4) feeding the ground pulp into a pulp extruding machine for extruding pulp to obtain the special cotton pulp.
A preparation method of a high-strength calcium silicate plate comprises the following steps:
a) mixing paper pulp and special cotton pulp, and uniformly stirring to obtain prefabricated pulp;
b) adding cement and quartz sand into the prefabricated slurry, and uniformly stirring and mixing to obtain mixed slurry;
c) and (3) feeding the mixed slurry into a plate making machine to prepare a blank plate, putting the blank plate into a mould to be pressed and formed, and then demoulding to obtain the composite material.
Comparative example 1
Comparative example 1 differs from example 1 in that the specialty cotton pulp is replaced with an equal amount of sulfite wood pulp.
Comparative example 2
Comparative example 2 is different from example 1 in that sulfite wood pulp added in example 1 is replaced with general waste pulp.
Comparative example 3
Comparative example 3 differs from example 1 in that the special cotton pulp is replaced by normal cotton pulp.
And (3) performance testing:
the flexural strength of the calcium silicate board is measured according to a GB/T8040 test method, the thermal conductivity is measured according to a GB/T10294 test method, the thermal shrinkage is measured according to a GB/T10699 test method, and the water content and the density are measured according to a GB/T7019 test method. The performance change of the calcium silicate sheets of examples and comparative examples with respect to the calcium silicate sheet of non-asbestos fiber reinforcement was calculated, respectively, using the calcium silicate sheet of non-asbestos fiber reinforcement purchased from the market as a control.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A high-strength calcium silicate board is characterized by comprising the following components in parts by weight:
30-35 parts of cement, namely cement,
55-65 parts of quartz sand,
4-7 parts of paper pulp,
2-5 parts of special cotton pulp;
the pulp is sulfite wood pulp;
the preparation method of the special cotton pulp comprises the following steps:
1) opening cotton and removing impurities from the cotton linter to obtain impurity-removed cotton linter;
2) mixing alkali liquor, hydrogen peroxide and water to obtain a mixed solution, pumping the mixed solution into a first double-screw extrusion impregnator, adding impurity-removing cotton linters at the same time, and carrying out extrusion impregnation to obtain extrusion impregnation slurry, wherein the current of the first double-screw extrusion impregnator is controlled at 380-420A; then the extrusion dipping slurry and the residual mixed solution react for 25-35min, the temperature is controlled at 80-90 ℃, after the reaction is finished, the reaction material is sent into a second double-screw extrusion dipping machine for extrusion, cutting and water washing to obtain the cotton linter slurry, and the current of the second double-screw extrusion dipping machine is controlled at 420-450A;
3) feeding the cotton linter pulp into a beating machine for beating to obtain beating pulp, feeding the beating pulp into a refiner for refining to obtain refined pulp, feeding the refined pulp into a refiner for refining to obtain milled pulp, and controlling the length range of cotton pulp fibers after the milling to be 1.5-2.0 mm;
4) and (4) feeding the ground pulp into a pulp extruding machine for extruding pulp to obtain the special cotton pulp.
2. The high-strength calcium silicate board as claimed in claim 1, wherein the defibering current in the pulping process in step 3) is less than 120A, and the defibering time is 12-18 min; the tapping current is less than 135A, and the tapping time is 40-60 min.
3. The high-strength calcium silicate board as claimed in claim 1, wherein the slurry refining current in the slurry refining process in step 3) is 320-330A, and the slurry refining time is 70-90 min.
4. The high-strength calcium silicate board as claimed in claim 1, wherein the refining current in the refining process in step 3) is controlled at 220-240A, and the refining time is controlled at 60-80 min.
5. A high strength calcium silicate board as claimed in claim 1, wherein the length of the pulp fibres in the pulp is in the range of 2.0-2.5 mm.
6. A method of manufacturing a high strength calcium silicate board for use in manufacturing a high strength calcium silicate board according to claim 1, comprising the steps of:
a) mixing paper pulp and special cotton pulp, and uniformly stirring to obtain prefabricated pulp;
b) adding cement and quartz sand into the prefabricated slurry, and uniformly stirring and mixing to obtain mixed slurry;
c) and (3) feeding the mixed slurry into a plate making machine to prepare a blank plate, putting the blank plate into a mould to be pressed and formed, and then demoulding to obtain the composite material.
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| CN105198308A (en) * | 2014-06-30 | 2015-12-30 | 中国科学院过程工程研究所 | Method for preparing lightweight calcium silicate board |
| CN111395026A (en) * | 2019-01-03 | 2020-07-10 | 安徽雪龙纤维科技股份有限公司 | Production method of high-viscosity cotton pulp |
| CN111217560A (en) * | 2020-02-21 | 2020-06-02 | 郑州知淘信息科技有限责任公司 | Asbestos-free straw fiber reinforced cement board and preparation method thereof |
| CN112900134A (en) * | 2021-01-25 | 2021-06-04 | 合肥银山棉麻股份有限公司 | Method for improving fracture length index of cotton pulp board |
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