CN109808043B - Method for enhancing strength of insulation board - Google Patents
Method for enhancing strength of insulation board Download PDFInfo
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- CN109808043B CN109808043B CN201910144457.2A CN201910144457A CN109808043B CN 109808043 B CN109808043 B CN 109808043B CN 201910144457 A CN201910144457 A CN 201910144457A CN 109808043 B CN109808043 B CN 109808043B
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Abstract
The invention provides a method for enhancing the strength of an insulation board, wherein in the process of preparing the insulation board by adopting a semi-dry pressing method, the working procedures comprise the working procedures of material preparation, staling, semi-dry pressing forming, drying, sintering and the like. The invention obtains the density and the strength of the required plate body by increasing the compression ratio of four sides in the forming procedure, thereby realizing the high strength, the light weight and the low conductivity of the plate body.
Description
Technical Field
The invention relates to the technical field of manufacturing processes of light insulation boards for buildings, in particular to a method for enhancing the strength of an insulation board by increasing the compression ratio of four sides.
Background
The currently available non-combustible heat preservation plates are as follows: rock wool board, foamed cement board, foamed ceramic board, foamed glass board, expanded perlite heat-insulating board, vitrified aggregate ceramic heat-insulating board, light ceramsite board and the like. But the heat conductivity coefficient of the heat-insulating wall body can meet the heat-insulating requirements of only rock wool boards, foamed glass boards, expanded perlite heat-insulating boards and vitrified aggregate ceramic heat-insulating boards. The molding process of the two inorganic insulation boards, namely the expanded perlite insulation board and the vitrified aggregate ceramic insulation board, adopts semi-dry pressing, but the molded boards are homogeneous boards. Thus, the products all present the following problems: the product with better strength has larger heat conductivity coefficient, and the product with smaller heat conductivity coefficient has strength which is difficult to meet the construction requirement.
In chinese patent application nos. 201210259809.7, 201310577279.5, and 201310578688.7, three methods for preparing heat-insulating boards by using a semi-dry press forming machine sintering process are disclosed, all of which are methods for reducing heat conductivity and enhancing green body strength by using methods such as formula adjustment, volume limit compression, binder adjustment, and the like, and the obtained board has a homogeneous density and is not related to a method for enhancing the board strength by changing a mold structure.
Disclosure of Invention
The invention aims to provide a method for enhancing the strength of a heat-insulating plate, in particular to a method for enhancing the strength of the heat-insulating plate by increasing the compression ratio of four sides, which aims to solve the problems that the integral strength of the plate is greatly improved under the condition of maintaining a lower heat conductivity coefficient of the existing semi-dry press-shaped light heat-insulating plate, and the construction damage of the heat-insulating plate is large due to low strength.
The invention provides a method for enhancing the strength of a heat-insulation plate, which specifically comprises the following steps:
(1) preparing materials: expanding the porous granules and a cementing material according to the weight ratio: cement = 1: 0.5-1: 0.8 proportion and mixing evenly;
(2) and (3) staling: aging the uniformly mixed batch for 8-16 hours;
(3) semi-dry pressing and forming: firstly, distributing aged mixture in a central mold cavity and a peripheral mold cavity of a frame, wherein the bottom surfaces of the central mold cavity and the peripheral mold cavity are not on the same horizontal plane; then, the powder in the two die cavities is pressurized at different speeds, so that the powder in the two die cavities rises to the same plane at the same time to form a formed blank, the volume compression ratio of the central part of the formed blank is 1: 0.5-0.8 during pressurization, and the volume compression ratio of the peripheral part of the frame is 1: 0.2-0.3;
(4) drying and sintering: drying the pressed blank at 80-120 ℃ for 30-60 min, sintering in a sintering roller kiln at the sintering temperature: sintering at 800-1000 deg.c for 80-120 min to obtain the heat insulating board.
In the above technical scheme, the blank obtained by the forming in the step (3) is a heterogeneous plate body.
In the technical scheme, the main process parameters are as follows: the volume compression ratio of the central part of the formed blank body is 1: 0.5-0.8 during pressurization, the compression ratio of the frame part is 1: 0.2-0.3, the compression strength of the middle part of the prepared insulation board is 0.125MPa, and the compression strength of the frame is 0.450 MPa.
The core of the method of the invention is as follows: distributing materials in a central die cavity and a die cavity at the periphery of the frame, wherein the bottom surfaces of the central die cavity and the die cavity are not on the same horizontal plane; and then, the powder in the two die cavities is pressurized at unequal speed, so that the powder in the two die cavities simultaneously rises to the same plane to form a formed blank, the volume compression ratio of the central part of the formed blank is 1: 0.5-0.8 during pressurization, and the volume compression ratio of the peripheral part of the frame is 1: 0.2-0.3, so that the middle density of the heat-insulating plate of the formed blank is smaller, the edge density of the heterogeneous plate body is higher, and the integral strength of the heat-insulating plate is enhanced due to the skeleton action of the edge.
Drawings
FIG. 1 is a cloth schematic diagram of the method for enhancing the strength of the insulation board of the present invention;
FIG. 2 is a schematic pressing diagram of the method for enhancing the strength of the insulation board of the present invention;
FIG. 3 is a schematic diagram of the ejection of the method for enhancing the strength of the insulation board according to the present invention;
in the figure, an upper die-1, a lower die-2, a die cavity-3, a compression material-4 and a blank-5.
Detailed Description
Embodiment 1: mixing the expanded perlite granules and the fusible silicate slurry according to the weight ratio of 1:0.5, and adding a green body reinforcing agent accounting for 0.2 percent of the total amount of the materials to prepare a mixture required by molding. Distributing the mixture in a central mold cavity and a peripheral mold cavity of the frame, wherein the bottom surfaces of the central mold cavity and the peripheral mold cavity are not on the same horizontal plane; and then, the powder in the two die cavities is pressurized at different speeds, so that the powder in the two die cavities simultaneously rises to the same plane to form a formed blank. The die cavity depth of the frame is 28cm, the middle die cavity depth is 15cm, and the thickness of the pressed blank is 7 cm. And drying the green body at 120 ℃, and sintering in a roller kiln at 930 ℃ for 90 min. The density of the prepared sintered plate is 167kg/cm3, the heat conductivity coefficient is 0.052 w/(m.k), and the compressive strength is 0.392 MPa.
Embodiment 2: the weight ratio of expanded perlite: cement = 1: 0.55' of ingredients. The particle size of the expanded perlite is 20-60 meshes, the cementing material is a composite slurry of fusible silicate and an organic green body reinforcing agent, and the mixture ratio is 9: 1, the concentration of the composite slurry is 36 percent. And (3) ageing the uniformly mixed batch for 16 hours. Distributing the aged mixture in a central mold cavity and a peripheral mold cavity of the frame, wherein the bottom surfaces of the central mold cavity and the peripheral mold cavity are not on the same horizontal plane; and then, the powder in the two die cavities is pressurized at different speeds, so that the powder in the two die cavities simultaneously rises to the same plane to form a formed blank. When the die is formed, the depth of a die cavity of the frame is 30cm, the depth of a die cavity of the middle part is 15cm, and the thickness of a pressed blank is 7 cm. The pressed green body was dried at 120 ℃. And then sintering in a sintering roller kiln at the sintering temperature of 950 ℃ for 85 min. The density of the sintered plate is 173kg/cm3, the thermal conductivity coefficient is 0.053 w/(m.k), and the compressive strength is 0.413 MPa.
Fig. 1 to 3 are schematic diagrams of a blank forming process of the method for enhancing the strength of the insulation board of the invention; the method comprises the following steps: changing a whole lower module of the semi-dry pressing mould into two parts, namely, a lower module with 2cm around and a lower module with one center; the two material distributing cavities are not in the same plane when forming the material distributing cavities, the peripheral cavities are deep, and the two material distributing cavities rise to the same plane when pressing, so that the strength of the plate body is improved by more than 3 times compared with that of a homogeneous blank body.
The invention is characterized in that the edge density of the plate body is higher than the middle density by adopting a forming mode of increasing the compression ratio of four edges, so that the plate body plays a role of a skeleton, the strength of the plate body is enhanced, the density of the prepared product is 150-180 kg/cm3, the heat conductivity coefficient is 0.045-0.055 w/(m.k), and the compressive strength is more than or equal to 0.39 MPa.
Claims (2)
1. A method for enhancing the strength of an insulation board is characterized by comprising the following steps: (1) preparing materials: expanding the porous granules and a cementing material according to the weight ratio: the cementing material is 1: 0.5-1: 0.8 proportion and mixing evenly; (2) and (3) staling: aging the uniformly mixed batch for 8-16 hours; (3) semi-dry pressing and forming: firstly, distributing aged mixture in a central mold cavity and a peripheral mold cavity of a frame, wherein the bottom surfaces of the central mold cavity and the peripheral mold cavity are not on the same horizontal plane; then, the powder in the two die cavities is pressurized at different speeds, so that the powder in the two die cavities rises to the same plane at the same time to form a formed blank, the volume compression ratio of the central part of the formed blank is 1: 0.5-0.8 during pressurization, and the volume compression ratio of the peripheral part of the frame is 1: 0.2-0.3; (4) drying and sintering: drying the pressed blank at 80-120 ℃ for 30-60 min, sintering in a sintering roller kiln at the sintering temperature: sintering at 800-1000 deg.c for 80-120 min to obtain heat insulating board; the compression strength of the middle part of the insulation board prepared in the step (4) is 0.125MPa, and the compression strength of the frame is 0.450 MPa; and (4) the blank obtained by the step (3) is a heterogeneous plate body.
2. The method for enhancing the strength of the heat insulation board according to claim 1, wherein the volume compression ratio of the central part is 1: 0.5-0.8, and the volume compression ratio of the frame part is 1: 0.2-0.3 during the forming and pressing in the step (3).
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| CN201910144457.2A CN109808043B (en) | 2019-02-27 | 2019-02-27 | Method for enhancing strength of insulation board |
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| CN201910144457.2A CN109808043B (en) | 2019-02-27 | 2019-02-27 | Method for enhancing strength of insulation board |
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| CN109808043A CN109808043A (en) | 2019-05-28 |
| CN109808043B true CN109808043B (en) | 2021-01-01 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201501026U (en) * | 2009-09-30 | 2010-06-09 | 练其辉 | Brick-pressing mold |
| CN203541522U (en) * | 2013-11-01 | 2014-04-16 | 横店集团东磁股份有限公司 | Thin-wall powder metallurgy forming die |
| CN104626340A (en) * | 2015-02-27 | 2015-05-20 | 夹江县巨浪机械有限责任公司 | Ceramic tile forming die and manufacturing method thereof |
| US9649778B2 (en) * | 2013-12-02 | 2017-05-16 | Angelo Risi | Method and mold for manufacturing an interlocking concrete block |
| CN108640644A (en) * | 2018-06-11 | 2018-10-12 | 咸阳陶瓷研究设计院有限公司 | A kind of preparation process of built-in steel wire thermal insulation board |
| CN208133223U (en) * | 2018-04-28 | 2018-11-23 | 郑建立 | Gypsum line molding machine and gypsum line molding equipment |
-
2019
- 2019-02-27 CN CN201910144457.2A patent/CN109808043B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201501026U (en) * | 2009-09-30 | 2010-06-09 | 练其辉 | Brick-pressing mold |
| CN203541522U (en) * | 2013-11-01 | 2014-04-16 | 横店集团东磁股份有限公司 | Thin-wall powder metallurgy forming die |
| US9649778B2 (en) * | 2013-12-02 | 2017-05-16 | Angelo Risi | Method and mold for manufacturing an interlocking concrete block |
| CN104626340A (en) * | 2015-02-27 | 2015-05-20 | 夹江县巨浪机械有限责任公司 | Ceramic tile forming die and manufacturing method thereof |
| CN208133223U (en) * | 2018-04-28 | 2018-11-23 | 郑建立 | Gypsum line molding machine and gypsum line molding equipment |
| CN108640644A (en) * | 2018-06-11 | 2018-10-12 | 咸阳陶瓷研究设计院有限公司 | A kind of preparation process of built-in steel wire thermal insulation board |
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