CN115724612A - Calcium silicate board activator and application thereof in preparation of calcium silicate board - Google Patents
Calcium silicate board activator and application thereof in preparation of calcium silicate board Download PDFInfo
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- CN115724612A CN115724612A CN202211526035.XA CN202211526035A CN115724612A CN 115724612 A CN115724612 A CN 115724612A CN 202211526035 A CN202211526035 A CN 202211526035A CN 115724612 A CN115724612 A CN 115724612A
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- calcium silicate
- silicate board
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- 239000000378 calcium silicate Substances 0.000 title claims abstract description 156
- 229910052918 calcium silicate Inorganic materials 0.000 title claims abstract description 156
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 title claims abstract description 156
- 239000012190 activator Substances 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- 239000000243 solution Substances 0.000 claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 239000003513 alkali Substances 0.000 claims abstract description 8
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical class OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000012266 salt solution Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 22
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 19
- 239000000920 calcium hydroxide Substances 0.000 claims description 19
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 19
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 14
- 210000001161 mammalian embryo Anatomy 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 238000003825 pressing Methods 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 12
- 239000010453 quartz Substances 0.000 claims description 12
- 239000011398 Portland cement Substances 0.000 claims description 11
- 239000000292 calcium oxide Substances 0.000 claims description 11
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical group [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 9
- 210000001654 germ layer Anatomy 0.000 claims description 8
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 7
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 claims description 7
- 229910000342 sodium bisulfate Inorganic materials 0.000 claims description 7
- 230000008961 swelling Effects 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- WPJGWJITSIEFRP-UHFFFAOYSA-N 1,3,5-triazine-2,4,6-triamine;hydrate Chemical compound O.NC1=NC(N)=NC(N)=N1 WPJGWJITSIEFRP-UHFFFAOYSA-N 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 229910000343 potassium bisulfate Inorganic materials 0.000 claims description 3
- 238000010025 steaming Methods 0.000 claims description 3
- 238000004381 surface treatment Methods 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-M hydrogensulfate Chemical compound OS([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 claims 2
- JTNCEQNHURODLX-UHFFFAOYSA-N 2-phenylethanimidamide Chemical compound NC(=N)CC1=CC=CC=C1 JTNCEQNHURODLX-UHFFFAOYSA-N 0.000 claims 1
- 239000003469 silicate cement Substances 0.000 claims 1
- 230000000704 physical effect Effects 0.000 abstract description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 13
- 238000005452 bending Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 7
- 239000012535 impurity Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- 239000011575 calcium Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- MKTRXTLKNXLULX-UHFFFAOYSA-P pentacalcium;dioxido(oxo)silane;hydron;tetrahydrate Chemical compound [H+].[H+].O.O.O.O.[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O MKTRXTLKNXLULX-UHFFFAOYSA-P 0.000 description 4
- 239000013543 active substance Substances 0.000 description 3
- 238000007676 flexural strength test Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- CHKVPAROMQMJNQ-UHFFFAOYSA-M potassium bisulfate Chemical compound [K+].OS([O-])(=O)=O CHKVPAROMQMJNQ-UHFFFAOYSA-M 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a calcium silicate board activator, which comprises a component A and a component B; the component A comprises the following raw materials in parts by weight: hydrogen sulfate salt solution: 65.8-70 parts; adding an auxiliary agent: 8-12 parts; the component B comprises the following raw materials in parts by weight: alkali solution: 20-24.2 parts. When the calcium silicate board activator is applied to the preparation of the calcium silicate board, the overall physical property and mechanical property of the calcium silicate board can be effectively improved.
Description
Technical Field
The invention belongs to the technical field of building decoration materials, and particularly relates to a calcium silicate board activator and application thereof in preparation of a calcium silicate board.
Background
The calcium silicate board is a novel decorative material with stable performance invented by American companies in the 70 th century, is widely applied, is mainly used as a partition wall, a suspended ceiling, a ceiling and the like indoors, can be used for functions of exterior wall pictures and the like outdoors, and has continuously increased yield since the introduction of the calcium silicate board into China, so that the calcium silicate board is widely welcomed by the building market.
The calcium silicate board is prepared with silica and calcium as main material, fiber as reinforcing material and other supplementary material. Wherein the calcareous material is mainly provided by calcium oxide which is an active substance in lime, and the siliceous material is provided by silicon dioxide. The content of effective calcium oxide in lime is about 58%, and the low content of calcium oxide means that more useless impurities are brought in the raw materials, which inevitably affects the strength of the product. The strength of the calcium silicate board is mainly derived from calcium silicate hydrate, namely tobermorite, generated by the calcium silicate board under the condition of later-stage high-temperature steam curing, wherein substances participating in the reaction are active calcium hydroxide and silicon dioxide, and the calcium hydroxide is generated by the reaction of the active calcium oxide and water. Meanwhile, the yield of the tobermorite generated in the later period of the calcium silicate board also determines the overall strength and the fire resistance of the calcium silicate board.
The main index of the calcium silicate board is the strength index. However, the overall strength of the calcium silicate board is not high due to various factors in the actual production process, and the application range and use of the calcium silicate board are limited.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a calcium silicate board activator and application thereof in preparation of a calcium silicate board, wherein the calcium silicate board activator can effectively improve the overall physical property and mechanical property of the calcium silicate board when being applied to the preparation of the calcium silicate board.
The technical purpose of the invention is realized by the following technical scheme:
a calcium silicate board activator comprises a component A and a component B; wherein the component A comprises the following raw materials in parts by weight: hydrogen sulfate salt solution: 65.8-70 parts; adding an auxiliary agent: 8-12 parts; the component B comprises the following raw materials in parts by weight: alkali solution: 20-24.2 parts.
Preferably, the concentration of the hydrogen sulfate salt solution is 30% -43%, and the hydrogen sulfate salt solution is at least one of a sodium hydrogen sulfate solution and a potassium hydrogen sulfate solution.
Preferably, the external auxiliary agent is prepared from a water reducing agent and an expanding agent according to the weight ratio (8-8.5): (2-1.5).
Preferably, the water reducing agent is at least one of a liquid polycarboxylic acid water reducing agent or a melamine water reducing agent.
Preferably, the swelling agent is a calcium oxide-based swelling agent.
Preferably, the concentration of the alkali solution is 40% -48%, and the alkali solution is at least one of a potassium hydroxide solution or a sodium hydroxide solution.
The preparation method of the calcium silicate board comprises the following steps of adding the calcium silicate board activator into the preparation process of the calcium silicate board:
(1) Mixing quartz powder, portland cement, hydrated lime, water and the component A in the calcium silicate board activator, stirring and standing to obtain a mixture;
(2) Performing flow slurry on the mixture obtained in the step (1) to form an embryo, and adding a component B in the calcium silicate board activator on the surface of a germinal layer of the embryo to obtain an embryo body;
(3) And (3) pressing, steaming and carrying out surface treatment on the blank obtained in the step (2) to obtain a finished product of the calcium silicate board.
Preferably, in the step (1), the weight ratio of the quartz powder, the portland cement, the hydrated lime and the water is (55-65): (10-20): (20-30): (190-270), the weight ratio of the sum of the weight of the quartz powder, the portland cement, the hydrated lime and the water to the component A in the calcium silicate board activator is (180-230): 1.
preferably, in the step (1), the standing time is 1-5min.
Preferably, in the step (2), the weight ratio of the component B added into the calcium silicate board activator to the germ layer is 1: (350-400).
Preferably, in the step (3), the pressing includes pressing the blank into a calcium silicate board blank, and the thickness of the calcium silicate board blank is 8-8.1mm.
Preferably, in the step (3), the pressing further comprises pressing the calcium silicate board blank, and the pressing pressure of the calcium silicate board blank is 7000-9000 tons.
Preferably, in the step (3), the steam curing temperature is 150-200 ℃, the steam curing pressure is 0.8-1.5MPa, and the steam curing time is 6-10h.
Preferably, in the step (3), the surface treatment refers to sanding and forming.
The invention has the beneficial effects that:
(1) When the calcium silicate board activator is applied to the preparation of the calcium silicate board, the component A is firstly added in the process of preparing calcium silicate board slurry, and the mixture is stirred and stood, so that the following reaction can occur
CaO+H 2 O＝Ca(OH) 2
2HSO 4 - +CaCO 3 ＝CaSO 4 +SO 4 2- +H 2 O+CO 2
CaSO 4 +2H 2 O＝CaSO 4 ·2H 2 O
Calcium carbonate impurities which are not active in the calcium silicate board are effectively consumed in the process, calcium sulfate and calcium hydroxide are generated in the process, wherein the calcium sulfate has water absorption property, and is quickly condensed and hardened to form strength after absorbing water, so that a certain strength is provided for the early stage of the calcium silicate board and the later-stage forming of the calcium silicate board is facilitated;
then, during the formation of an embryo of the calcium silicate board, uniformly adding the component B on the upper surface of the germinal layer, after roller pressing and primary forming, putting the germinal layer into a high-temperature steam curing process until the final surface is sanded and formed, wherein the following reactions can occur during the process:
CaSO 4 +2OH - ＝Ca(OH) 2 +SO 4 2-
Ca(OH) 2 +SiO 2 ＝CaO·SiO·nH 2 o gel
Tobermorite gel-CSH (I) -tobermorite crystal-tobermorite (reaction condition: high temperature steam curing)
During the process, firstly, the alkali liquor reacts with part of calcium sulfate to generate a large amount of calcium hydroxide, and after rolling is finished, high-temperature steaming is carried out, in the process, a large amount of active substance calcium hydroxide and siliceous constituent silicon dioxide in the raw materials of the calcium silicate board generate hydrated calcium silicate crystalline tobermorite under the high-temperature hydrothermal synthesis condition, the reaction in the process is complex and the required time is long, and the strength is generally formed really only at the later stage of the calcium silicate board forming.
(2) When the calcium silicate board activator is applied to the preparation of the calcium silicate board, the problem of high impurity content in the raw materials is effectively solved, impurities in the raw materials are converted into active substance calcium hydroxide beneficial to the strength of the calcium silicate board, the calcium sulfate generated in the early forming stage of the calcium silicate board enhances the strength of the calcium silicate board in the early stage, and under the condition of high-temperature steam curing, the generated active calcium hydroxide reacts with siliceous substance silicon dioxide in the raw materials of the calcium silicate board to generate a large amount of Tobemolelite, so that the problem of insufficient later strength of the calcium silicate board is effectively solved, and the overall physical property and mechanical property of the calcium silicate board are enhanced.
(3) When the calcium silicate board activator is applied to the preparation of the calcium silicate board, the problem of high impurity content of the raw material in the calcium silicate board is effectively solved, the utilization efficiency of the raw material is improved, and meanwhile, the early strength of the calcium silicate board is improved and the problem of insufficient later strength of the calcium silicate board is solved.
(4) When the calcium silicate board activator is applied to the preparation of calcium silicate boards, a large amount of Tobemolite generated by the calcium silicate board activator provides good mechanical properties and physical properties for the calcium silicate boards, wherein the calcium silicate boards particularly and remarkably show extremely high bending flexural strength and fire resistance of flat boards, and the hardness of the surfaces of the calcium silicate boards is improved.
(5) When the calcium silicate board activator is applied to the preparation of the calcium silicate board, the hydration efficiency of the calcium silicate board in the reaction is enhanced by the addition of the auxiliary agent, the durability of the board is improved, and the structural firmness of the board is enhanced.
Drawings
FIG. 1 is a schematic diagram of bending flexural strength and transverse stiffness of a calcium silicate board according to an experimental example of the present invention;
FIG. 2 is a schematic diagram of bending flexural strength and longitudinal stiffness of a calcium silicate board according to an experimental example of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1:
a calcium silicate board activator comprises a component A and a component B; wherein the component A comprises the following raw materials in parts by weight: sodium bisulfate solution: 65.8 parts; liquid polycarboxylic acid water reducing agent: 8.2 parts of; calcium oxide-based swelling agent: 1.8 parts; the component B comprises the following raw materials in parts by weight: potassium hydroxide solution: 24.2 parts. Wherein the concentration of the sodium bisulfate solution is 30 percent, and the concentration of the potassium hydroxide solution is 40 percent.
The preparation method of the calcium silicate board comprises the following steps of adding the calcium silicate board activator into the preparation process of the calcium silicate board:
(1) Mixing 55 parts of quartz powder, 10 parts of portland cement, 20 parts of hydrated lime, 190 parts of water and a component A in a calcium silicate board activator, stirring, and standing for 2min to obtain a mixture, wherein the weight ratio of the sum of the quartz powder, the portland cement, the hydrated lime and the water to the component A in the calcium silicate board activator is 180:1;
(2) And (2) flowing the mixture obtained in the step (1) to form an embryo, adding a component B in the calcium silicate board activator to the surface of a germ layer of the embryo to obtain an embryo body, wherein the weight ratio of the component B added in the calcium silicate board activator to the germ layer is 1:350;
(3) Rolling the blank obtained in the step (2) to form a calcium silicate board blank, wherein the number of rolling turns is controlled to be 8, and the thickness of the obtained calcium silicate board blank is 8.05mm;
(4) And (4) pressing and forming the calcium silicate board blank obtained in the step (3) by a 8000-ton press, then placing the formed calcium silicate board blank into a still kettle for high-temperature steam curing, wherein the steam curing temperature is 180 ℃, the steam curing air pressure is 1MPa, the steam curing time is 8h, and after the steam curing is finished, sanding the surface of the formed calcium silicate board blank to obtain a finished calcium silicate board.
Comparative example 1:
a preparation method of a calcium silicate board is different from that of the calcium silicate board in the embodiment 1 only in that no calcium silicate board activating agent is added in the preparation process, and the rest steps and parameters are completely the same as those of the embodiment 1.
Example 2:
a calcium silicate board activator comprises a component A and a component B; wherein the component A comprises the following raw materials in parts by weight: potassium hydrogen sulfate solution: 68 parts of a mixture; melamine water reducing agent: 8 parts of a mixture; calcium oxide-based swelling agent: 2 parts of a mixture; the component B comprises the following raw materials in parts by weight: sodium hydroxide solution: 22 parts of the raw materials. Wherein the concentration of the sodium bisulfate solution is 43 percent, and the concentration of the potassium hydroxide solution is 48 percent.
The preparation method of the calcium silicate board comprises the following steps of adding the calcium silicate board activator in the preparation process of the calcium silicate board:
(1) Mixing 65 parts of quartz powder, 20 parts of portland cement, 30 parts of hydrated lime, 270 parts of water and a component A in a calcium silicate board activator, stirring, and standing for 2min to obtain a mixture, wherein the weight ratio of the sum of the quartz powder, the portland cement, the hydrated lime and the water to the component A in the calcium silicate board activator is 230:1;
(2) And (2) flowing the mixture obtained in the step (1) to form an embryo, adding a component B in the calcium silicate board activator to the surface of a germ layer of the embryo to obtain an embryo body, wherein the weight ratio of the component B added in the calcium silicate board activator to the germ layer is 1:400;
(3) Rolling the blank obtained in the step (2) to form a calcium silicate board blank, wherein the number of rolling turns is controlled to be 8, and the thickness of the obtained calcium silicate board blank is 8.05mm;
(4) And (4) pressing and forming the calcium silicate board blank obtained in the step (3) by a 8000-ton press, then placing the formed calcium silicate board blank into a still kettle for high-temperature steam curing, wherein the steam curing temperature is 180 ℃, the steam curing air pressure is 1MPa, the steam curing time is 8h, and after the steam curing is finished, sanding the surface of the formed calcium silicate board blank to obtain a finished calcium silicate board.
Comparative example 2:
a preparation method of a calcium silicate board is different from that of the embodiment 2 only in that no calcium silicate board activating agent is added in the preparation process, and the rest steps and parameters are completely the same as those of the embodiment 2.
Example 3:
a calcium silicate board activator comprises a component A and a component B; the component A comprises the following raw materials in parts by weight: sodium bisulfate solution: 70 parts of a binder; melamine water reducing agent: 8.5 parts; calcium oxide-based swelling agent: 1.5 parts; the component B comprises the following raw materials in parts by weight: potassium hydroxide solution: and 20 parts of the components. Wherein the concentration of the sodium bisulfate solution is 40 percent, and the concentration of the potassium hydroxide solution is 45 percent.
The preparation method of the calcium silicate board comprises the following steps of adding the calcium silicate board activator in the preparation process of the calcium silicate board:
(1) Mixing 60 parts of quartz powder, 15 parts of Portland cement, 25 parts of hydrated lime and 200 parts of component A in a calcium silicate board activator, stirring, and standing for 2min to obtain a mixture, wherein the weight ratio of the sum of the quartz powder, the Portland cement, the hydrated lime and the water to the component A in the calcium silicate board activator is 200:1;
(2) And (2) flowing the mixture obtained in the step (1) into a blank, adding a component B in the calcium silicate board activator to the upper surface of a germ layer of the blank to obtain a blank body, wherein the weight ratio of the component B added in the calcium silicate board activator to the germ layer is 1:362;
(3) Rolling the blank obtained in the step (2) to form a calcium silicate board blank, wherein the number of rolling turns is controlled to be 8, and the thickness of the obtained calcium silicate board blank is 8.05mm;
(4) And (4) pressing and forming the calcium silicate board blank obtained in the step (3) by a 8000-ton press, then putting the formed calcium silicate board blank into a still kettle for high-temperature steam curing, wherein the steam curing temperature is 180 ℃, the steam curing pressure is 1MPa, the steam curing time is 8h, and after the steam curing is finished, sanding the surface of the formed calcium silicate board blank to obtain a finished calcium silicate board.
Comparative example 3:
a method for preparing a calcium silicate board, which is different from the method in example 3 only in that no calcium silicate board activator is added in the preparation process, and the rest steps and parameters are completely the same as those in example 3.
Experimental example:
the name of the experiment: test of bending strength of calcium silicate plate
Experimental equipment: the plate bending resistance tester has the numerical value accurate to 0.01Mpa
Preparing a test piece: the 6 molded calcium silicate boards (prepared in experimental examples 1 to 3 and comparative examples 1 to 3) were cut out at symmetrical positions in the middle part of less than 25mm from the edge of the board, and 4 test pieces with the same number of vertical and parallel test pieces and dimensions of 250mm x 250mm were cut out and named as a, B, C and D, respectively.
The experimental steps are as follows:
a) Drying the test piece in a drying oven at 100-105 deg.C for 24 hr, taking out the test piece, and cooling to room temperature
b) The test piece is taken out after being put into water with the temperature of 10 ℃ for 24 hours, the water attached to the surface of the test piece is wiped off by a wet towel, and the test is immediately carried out
c) And (3) placing the test piece on a support with the front side facing upwards, wherein the distance between the supports is 215mm, and the central line of the flat plate is superposed with the loading central line. Controlling the loading speed to fracture the test piece within 30-50 s, reading the breaking load, measuring the width of the test piece at the fracture part and the thicknesses of the two symmetrical points, splicing the test piece again, performing secondary bending resistance in the vertical direction, reading the breaking load, and measuring the width of the fracture part and the thicknesses of the two symmetrical points.
The schematic diagram of the bending flexural strength transverse strength of the calcium silicate plate is shown in fig. 1, and the schematic diagram of the bending flexural strength longitudinal strength of the calcium silicate plate is shown in fig. 2.
The experimental results are as follows:
table 1: bending flexural Strength test (Unit: MPa) for calcium silicate plate of Experimental example 1 and comparative example 1
Table 2: bending flexural Strength test (Unit: MPa) for calcium silicate plate of Experimental example 2 and comparative example 2
Table 3: bending flexural Strength test (Unit: MPa) for calcium silicate plate of Experimental example 3 and comparative example 3
As can be seen from the data in tables 1 to 3, when the calcium silicate board activator of the present invention is applied to the preparation of a calcium silicate board, the average transverse resistance of the calcium silicate board can reach 34.16MPa or more, and the average longitudinal resistance of the calcium silicate board can reach 28.8MPa or more, meanwhile, the bending flexural strength of the calcium silicate board obtained by adding the calcium silicate board activator of the present invention in the preparation process is far higher than that of the calcium silicate board obtained by not adding the calcium silicate board activator of the present invention in the preparation process, as can be seen from comparative example 1, comparative example 2, and comparative example 3.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such modifications are intended to be included in the scope of the present invention.
Claims (10)
1. A calcium silicate board activator is characterized in that: comprises a component A and a component B;
the component A comprises the following raw materials in parts by weight:
hydrogen sulfate salt solution: 65.8-70 parts;
adding an auxiliary agent: 8-12 parts;
the component B comprises the following raw materials in parts by weight:
alkali solution: 20-24.2 parts.
2. The calcium silicate board activator according to claim 1, wherein: the concentration of the bisulfate solution is 30% -43%, and the bisulfate solution is at least one of a sodium bisulfate solution and a potassium bisulfate solution.
3. The calcium silicate board activator according to claim 1, wherein: the external auxiliary agent comprises a water reducing agent and an expanding agent according to the weight ratio (8-8.5): (2-1.5).
4. A calcium silicate board activator according to claim 3, characterized in that: the water reducing agent is at least one of a liquid polycarboxylic acid water reducing agent or a melamine water reducing agent.
5. A calcium silicate board activator according to claim 3, characterized in that: the swelling agent is calcium oxide swelling agent.
6. The calcium silicate board activator according to claim 1, characterized in that: the concentration of the alkali solution is 40% -48%, and the alkali solution is at least one of potassium hydroxide solution or sodium hydroxide solution.
7. A preparation method of a calcium silicate board is characterized by comprising the following steps: the calcium silicate board activator as defined in any one of claims 1 to 6 is added in the preparation process of the calcium silicate board, and comprises the following steps:
(1) Mixing quartz powder, portland cement, hydrated lime, water and the component A in the calcium silicate board activator, stirring and standing to obtain a mixture;
(2) Flowing the mixture obtained in the step (1) into an embryo, and adding the component B in the calcium silicate board activator to the upper surface of the germ layer of the embryo to obtain an embryo body;
(3) And (3) pressing, steaming and performing surface treatment on the blank obtained in the step (2) to obtain a finished product of the calcium silicate board.
8. The method for preparing a calcium silicate board according to claim 7, wherein: in the step (1), the weight ratio of the quartz powder, the silicate cement, the hydrated lime and the water is (55-65): (10-20): (20-30): (190-270), the weight ratio of the sum of the weight of the quartz powder, the portland cement, the hydrated lime and the water to the component A in the calcium silicate board activator is (180-230): 1.
9. the method for preparing a calcium silicate board according to claim 7, wherein: in the step (3), the pressing comprises pressing the blank body into a calcium silicate board blank, wherein the thickness of the calcium silicate board blank is 8-8.1mm.
10. The method for preparing a calcium silicate board according to claim 7, wherein: in the step (3), the steam curing temperature is 150-200 ℃, the steam curing pressure is 0.8-1.5MPa, and the steam curing time is 6-10h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211526035.XA CN115724612B (en) | 2022-12-01 | Calcium silicate board activator and application thereof in preparation of calcium silicate board |
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| CN202211526035.XA CN115724612B (en) | 2022-12-01 | Calcium silicate board activator and application thereof in preparation of calcium silicate board |
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| JP2004075462A (en) * | 2002-08-19 | 2004-03-11 | Asahi Kasei Corp | High strength calcium silicate hardened body |
| JP2010222229A (en) * | 2009-03-25 | 2010-10-07 | Zenichi Tsuruharatani | Surface modifying agent of calcium silicate sheet or cement sheet, and surface modifying method of calcium silicate sheet or cement sheet using the surface modifying agent |
| CN101898770A (en) * | 2010-06-03 | 2010-12-01 | 中南大学 | Method for recycling sodium hydroxide |
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| JP2004075462A (en) * | 2002-08-19 | 2004-03-11 | Asahi Kasei Corp | High strength calcium silicate hardened body |
| JP2010222229A (en) * | 2009-03-25 | 2010-10-07 | Zenichi Tsuruharatani | Surface modifying agent of calcium silicate sheet or cement sheet, and surface modifying method of calcium silicate sheet or cement sheet using the surface modifying agent |
| CN101898770A (en) * | 2010-06-03 | 2010-12-01 | 中南大学 | Method for recycling sodium hydroxide |
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