A composite method for fireproof and heat-insulating integrated plates

Abstract

A composite method for fireproof and heat-insulating integrated plates. The present invention belongs to the field of building materials. The present invention aims to solve the problems that the fireproof and heat-insulating integrated materials prepared by existing methods are prone to cracking and falling off during use, and at the same time, the use of adhesives increases production costs and environmental pollution. Method: First, weigh; second, prepare gypsum board slurry; third, pour and composite; fourth, apply pressure; fifth, demold. The present invention is used for the composite of fireproof and heat-insulating integrated plates.

Description

Technical Field

[0001] The present invention belongs to the field of building materials. Background Art

[0002] At present, the fireproof boards and thermal insulation boards widely used in the construction field each have their own advantages and disadvantages. The fireproof boards for construction are mainly cementitious boards such as gypsum boards, which have good fireproof performance but poor thermal insulation performance; while the thermal insulation boards mainly include materials such as rock wool boards and aluminum silicate fiber boards, which have good thermal insulation performance. Therefore, in practical applications, it is necessary to combine the two to achieve the effects of both fireproof and thermal insulation.

[0003] Traditionally, gypsum boards and building thermal insulation boards need to be installed separately during use, which increases the construction difficulty and cost. Therefore, the composite preparation of fireproof and thermal insulation integrated boards from gypsum boards and building thermal insulation boards has become the development direction. In the prior art, when preparing fireproof and thermal insulation integrated materials, the commonly used composite methods are bonding with adhesives and fixing with screws: adhesives usually use fireproof adhesives to bond gypsum boards and thermal insulation board materials together; screw fixing usually uses self-tapping screws to nail gypsum boards and thermal insulation board materials together. However, the above two methods will cause the composite boards to be prone to cracking and peeling during use, and at the same time, the use of adhesives will also increase production costs and environmental pollution. Summary of the Invention

[0004] The present invention aims to solve the problems that the fireproof and thermal insulation integrated materials prepared by the existing methods are prone to cracking and peeling during use, and at the same time, the use of adhesives increases production costs and environmental pollution, and further provides a composite method for fireproof and thermal insulation integrated boards.

[0005] A composite method for fireproof and thermal insulation integrated boards is carried out according to the following steps:

[0006] I. Weighing:

[0007] Weigh 800 parts to 1000 parts of calcined gypsum powder, 10 parts to 12 parts of modified starch ether, 20 parts to 30 parts of redispersible latex, 200 parts to 300 parts of gum arabic, 0.5 parts to 2.5 parts of citric acid retarder, 0.5 parts to 0.7 parts of silicone defoamer, 30 parts to 50 parts of inorganic fiber and 600 parts to 670 parts of water by mass.

[0008] II. Preparing gypsum board slurry:

[0009] Mix 0.5 to 2.5 parts of citric acid retarder with 600 to 670 parts of water until completely dissolved, then add 30 to 50 parts of inorganic fiber and stir until the inorganic fiber is evenly dispersed. Next, add 800 to 1000 parts of calcined gypsum powder and stir evenly. Finally, add 10 to 12 parts of modified starch ether, 20 to 30 parts of redispersible latex, 200 to 300 parts of gum arabic, and 0.5 to 0.7 parts of silicone defoamer and stir evenly to obtain the gypsum board slurry;

[0010] III. Pouring into the mold and compounding:

[0011] Pour the gypsum board slurry into the mold for initial setting to obtain the initially set gypsum slurry, then place the insulation board on the initially set gypsum slurry to obtain the board to be pressed;

[0012] IV. Pressurizing:

[0013] Pressurize the board to be pressed to obtain the initially set and pressurized board. Then, under the conditions of a temperature of 20°C to 25°C and a humidity of 60% to 65%, increase the pressing pressure from 0.5 MPa / min to 1 MPa / min to 3 MPa to 3.5 MPa in a gradient manner, and under the condition of a pressing pressure of 3 MPa to 3.5 MPa, press for 3 min to 5 min. Then, under the conditions of a temperature of 20°C to 25°C and a humidity of 60% to 65%, increase the pressing pressure from 0.5 MPa / min to 1 MPa / min to 4 MPa to 5 MPa in a gradient manner, and under the condition of a pressing pressure of 4 MPa to 5 MPa, press for 5 min to 10 min to obtain the board after the pressing treatment;

[0014] V. Demolding:

[0015] Let the board after the pressing treatment stand at room temperature until completely solidified, then demold and dry to obtain the fireproof and heat-insulating integrated board.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. In the initial setting stage of the fireproof board material (gypsum board slurry), the present invention composites the building insulation board with the fireproof board material and forms it by gradient pressing, which not only ensures the uniform thickness of the fireproof board but also ensures the bonding strength between the two;

[0018] 2. The present invention does not require the additional use of adhesives. Modified starch ether, redispersible latex, and gum arabic are incorporated into the gypsum board slurry as adhesives, which greatly improves the bonding strength between the fireproof material and the heat-insulating material, enables the heat-insulating material to have fireproof advantages and can be seamlessly bonded to the fireproof board. The prepared fireproof and heat-insulating integrated board has a synchronous composite process and strong adhesion force, reducing the production cost and use cost.

[0019] 3. The bonding strength of the fireproof and heat-insulating integrated board of the present invention can reach 1.5 MPa to 5 MPa, with both fireproof and heat-insulating effects. The thermal conductivity is as low as 0.07 W / (m·K) to 0.15 W / (m·K), and the fire resistance limit reaches 30 min to 3 h.

[0020] 4. The fireproof and heat-insulating integrated board prepared by the present invention has good use effect and stability. The stability is specifically judged by the permanent linear change of the board during heating and the water content. The measured permanent linear change of the board during heating is 0.3% to 0.5%, and the water content is as low as 0.3%.

[0021] In summary, the process of compounding the fireproof board and the building heat-insulating board to prepare the fireproof and heat-insulating integrated board proposed by the present invention has practicability, innovation and economy, has broad application prospects and market value, and meets the protection requirements stipulated by the Patent Law.

[0022] The present invention is used for a method of compounding a fireproof and heat-insulating integrated board. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the fireproof and heat-insulating integrated board prepared in Example 1. 1 is the heat-insulating board, and 2 is the fireproof board;

[0024] Figure 2 It is a physical diagram of the fireproof and heat-insulating integrated board prepared in Example 1. 1 is the heat-insulating board, and 2 is the fireproof board;

[0025] Figure 3 It is a micrograph of the interface between the two of the fireproof and heat-insulating integrated board prepared in Example 1;

[0026] Figure 4 It is a micrograph of the interface between the two of the fireproof and heat-insulating integrated board prepared in Example 2. Detailed Embodiments

[0027] The technical solution of the present invention is not limited to the following specific embodiments, and also includes any combination between the specific embodiments.

[0028] Specific Embodiment 1: A method for compounding a fireproof and heat-insulating integrated board in this embodiment is carried out according to the following steps:

[0029] 1. Weighing:

[0030] Weigh 800 parts to 1000 parts of gypsum powder, 10 parts to 12 parts of modified starch ether, 20 parts to 30 parts of redispersible latex, 200 parts to 300 parts of gum arabic, 0.5 part to 2.5 parts of citric acid retarder, 0.5 part to 0.7 part of silicone defoamer, 30 parts to 50 parts of inorganic fiber and 600 parts to 670 parts of water by mass;

[0031] II. Preparation of gypsum board slurry:

[0032] Mix 0.5 to 2.5 parts of citric acid retarder with 600 to 670 parts of water until completely dissolved, then add 30 to 50 parts of inorganic fiber and stir until the inorganic fiber is evenly dispersed. Then add 800 to 1000 parts of calcined gypsum powder and stir evenly. Finally, add 10 to 12 parts of modified starch ether, 20 to 30 parts of redispersible latex, 200 to 300 parts of gum arabic, and 0.5 to 0.7 parts of silicone defoamer and stir evenly to obtain the gypsum board slurry;

[0033] III. Pouring into mold and lamination:

[0034] Pour the gypsum board slurry into the mold for initial setting to obtain the initially set gypsum board slurry, and then place the insulation board on the initially set gypsum board slurry to obtain the board to be pressed;

[0035] IV. Pressurization:

[0036] Pressurize the board to be pressed to obtain the initially set and pressurized board. Then, under the conditions of a temperature of 20°C to 25°C and a humidity of 60% to 65%, increase the pressing pressure from 0 to 3 MPa to 3 MPa to 3.5 MPa at a gradient of 0.5 MPa / min to 1 MPa / min, and under the condition that the pressing pressure is 3 MPa to 3.5 MPa, press for 3 min to 5 min. Then, under the conditions of a temperature of 20°C to 25°C and a humidity of 60% to 65%, increase the pressing pressure from 3 MPa to 3.5 MPa to 4 MPa to 5 MPa at a gradient of 0.5 MPa / min to 1 MPa / min, and under the condition that the pressing pressure is 4 MPa to 5 MPa, press for 5 min to 10 min to obtain the pressed board;

[0037] V. Demolding:

[0038] Let the pressed board stand at room temperature until completely solidified, and then demold and dry to obtain the integrated fireproof and heat-insulating board.

[0039] In step V of this embodiment, the board is naturally dried at room temperature or excess moisture is removed using a drying device.

[0040] The beneficial effects of this embodiment are:

[0041] 1. In the initial setting stage of the fireproof board material (gypsum board slurry) in this embodiment, the building insulation board is laminated with the fireproof board material and formed by gradient pressurization, which not only ensures the uniform thickness of the fireproof board but also ensures the bonding strength between the two;

[0042] 2. This embodiment does not require additional adhesives. Modified starch ether, redispersible latex and gum arabic are added to the gypsum board slurry as adhesives, which greatly improves the bonding strength between the fireproof material and the thermal insulation material, so that the thermal insulation material has both fireproof advantages and can be seamlessly bonded with the fireproof board. The prepared fireproof and thermal insulation integrated board has a synchronous composite process and strong bonding strength, which reduces production costs and use costs.

[0043] 3. The bonding strength of the fireproof and heat-insulating integrated board in this embodiment can reach 1.5MPa to 5MPa, and it has both fireproof and heat-insulating effects. The thermal conductivity is as low as 0.07W / (mK) to 0.15W / (mK), and the fire protection limit reaches 30min to 3h.

[0044] 4. The fireproof and heat-insulating integrated board prepared in this embodiment has good use effect and stability. The stability is specifically evaluated by using the permanent line change of the board heating and the water content as indicators. The measured permanent line change of the board heating is 0.3% to 0.5%, and the water content is as low as 0.3%.

[0045] In summary, the process of preparing fireproof and thermal insulation integrated panels by composite fireproof panels and building insulation panels proposed in this embodiment is practical, innovative and economical, has broad application prospects and market value, and meets the protection requirements stipulated in the Patent Law.

[0046] Specific implementation method 2: This implementation method is different from the specific implementation method 1 in that the modified starch ether described in step 1 is starch. The rest is the same as the specific implementation method 1.

[0047] Specific implementation method 3: This implementation method is different from specific implementation method 1 or 2 in that the redispersible latex in step 1 is polyvinyl acetate. Other aspects are the same as specific implementation method 1 or 2.

[0048] Specific embodiment 4: This embodiment is different from specific embodiments 1 to 3 in that the organosilicon defoaming agent in step 1 is polydimethylsiloxane. The rest is the same as specific embodiments 1 to 3.

[0049] Specific embodiment 5: This embodiment differs from specific embodiments 1 to 4 in that the inorganic fiber described in step 1 is glass fiber, ceramic fiber or basalt fiber, with a length of 3 mm to 5 mm and a diameter of 2 μm to 3 μm; the insulation board described in step 3 is rock wool board or aluminum silicate fiber board. The rest is the same as specific embodiment 4.

[0050] Specific implementation example 6: This implementation example is different from specific implementation examples 1 to 5 in that the inorganic fibers described in step 1 are of the same type as the fibers in the insulation board described in step 3. Other aspects are the same as specific implementation examples 1 to 5.

[0051] Embodiment Seven: The difference between this embodiment and any one of Embodiments One to Six is that in Step Three, the gypsum board slurry is poured into a mold and vibrated with a vibrator until the surface of the slurry is level and there are no obvious bubbles. Others are the same as those in Embodiments One to Six.

[0052] Embodiment Eight: The difference between this embodiment and any one of Embodiments One to Seven is that in Step Three, the initial setting specifically means placing the gypsum board slurry for 1 min to 2 min under the conditions of a temperature of 20°C to 25°C and a humidity of 85% to 90%. Others are the same as those in Embodiments One to Seven.

[0053] Embodiment Nine: The difference between this embodiment and any one of Embodiments One to Eight is that in Step Four, under the conditions of a temperature of 20°C to 25°C, a humidity of 60% to 80%, and a pressing pressure of 1 MPa to 1.5 MPa, the sheet to be pressed is pressed for 1 min to 2 min to obtain an initially set and pressed sheet. Others are the same as those in Embodiments One to Eight.

[0054] Embodiment Ten: The difference between this embodiment and any one of Embodiments One to Nine is that in Step Five, the drying specifically means drying at a temperature of 55°C to 60°C for 24 h to 30 h. Others are the same as those in Embodiments One to Nine.

[0055] The following examples are used to verify the beneficial effects of the present invention:

[0056] Example One, combined with Figure 1 Specific description:

[0057] A method for compounding a fireproof and heat-insulating integrated board, which is carried out according to the following steps:

[0058] One, weighing:

[0059] Weigh 850 parts of calcined gypsum powder, 11 parts of modified starch ether, 25 parts of redispersible latex, 255 parts of gum arabic, 0.5 part of citric acid retarder, 0.6 part of silicone defoamer, 40 parts of inorganic fiber, and 650 parts of water by mass;

[0060] Two, preparing gypsum board slurry:

[0061] 0.5 parts of citric acid retarder and 650 parts of water were mixed until completely dissolved, and then 40 parts of inorganic fiber were added, and the mixture was stirred for 10 minutes at a rotation speed of 1500 r / min until the inorganic fiber was evenly dispersed, and then 850 parts of gypsum powder were added, and the mixture was stirred for 2 minutes at a rotation speed of 1000 r / min until the mixture was evenly dispersed, and finally 11 parts of modified starch ether, 25 parts of redispersible latex, 255 parts of gum arabic and 0.6 parts of silicone defoamer were added in sequence, and the mixture was stirred for 5 minutes at a rotation speed of 2000 r / min until the mixture was evenly dispersed, to obtain gypsum board slurry;

[0062] 3. Casting and compounding:

[0063] Pour the gypsum board slurry into the mold and vibrate it with a vibrator until the slurry surface is leveled and there are no obvious bubbles. Place the gypsum board slurry for 1.5 minutes at a temperature of 25°C and a humidity of 90% to obtain the initial setting gypsum slurry. Then place the insulation board on the initial setting gypsum slurry to obtain the board to be pressed.

[0064] 4. Pressurization:

[0065] Under the conditions of temperature of 25°C, humidity of 70% and pressing pressure of 1MPa, the sheet to be pressed is pressed for 2min to obtain an initial setting pressurized sheet, and then under the conditions of temperature of 25°C and humidity of 60%, the pressing pressure is increased to 3MPa at a gradient of 0.5MPa / min, and pressed for 4min under the condition of pressing pressure of 3MPa, and then under the conditions of temperature of 25°C and humidity of 60%, the pressing pressure is increased to 4MPa at a gradient of 0.5MPa / min, and pressed for 5min under the condition of pressing pressure of 4MPa to obtain a pressurized sheet;

[0066] 5. Demolding:

[0067] The pressurized board is left to stand at room temperature for 24 hours until it is completely solidified, then demoulded and dried to obtain a fireproof and heat-insulating integrated board.

[0068] The modified starch ether described in step 1 is starch.

[0069] The redispersible latex described in step 1 is polyvinyl acetate.

[0070] The organosilicon defoamer described in step 1 is polydimethylsiloxane.

[0071] The inorganic fiber described in step 1 is a ceramic fiber with a length of 3 mm and a diameter of 2 μm.

[0072] The insulation board described in step three is aluminum silicate fiberboard, purchased from Anyida's aluminum silicate ceramic fiberboard high-aluminum inorganic series, model SYGX-234, with a thickness of 20 mm and good fire resistance.

[0073] The drying described in Step 5 is specifically carried out at a temperature of 60°C for 24 hours.

[0074] Example 2: The difference between this example and Example 1 is that: the inorganic fiber described in Step 1 is basalt fiber; the insulation board described in Step 3 is a rock wool board, purchased from the MF-S80 model in the Rockwool High Compressive Floor Series of Rockwool, with a thickness of 50 mm, which is a fireproof insulation board with a certain rigidity. Others are the same as in Example 1.

[0075] The fireproof and heat-insulating integrated board prepared in Step 5 of Example 1 is composed of an insulation board and a fireproof board (gypsum board), as Figure 2 shown. Figure 2 Fig. is the physical diagram of the fireproof and heat-insulating integrated board prepared in Example 1, 1 is the insulation board, and 2 is the fireproof board; among them, the size of the insulation board is 400 mm × 600 mm, the thickness is 20 mm, the fireproof board is a gypsum board, the size is 400 × 600 mm, and the thickness is 4.5 mm.

[0076] Figure 3 Fig. is the micrograph of the interface between the two of the fireproof and heat-insulating integrated board prepared in Example 1; it can be seen from the figure that the cementitious material in the gypsum board fills the "pits" on the surface of the heat-insulating material and penetrates about 100 microns into the material interior, and the cementitious material and the heat-insulating material are intertwined with each other, and the bonding strength of the prepared fireproof and heat-insulating integrated material is strong, realizing seamless connection.

[0077] Figure 4 Fig. is the micrograph of the interface between the two of the fireproof and heat-insulating integrated board prepared in Example 2; it can be seen from the figure that the rock wool fibers and the gypsum board are intertwined tightly, the rock wool fibers penetrate about 500 microns into the interior of the gypsum board, and are firmly embedded in the interior of the gypsum board, and the composite effect is good.

[0078] It can be seen from this that in Example 1 and Example 2, the aluminosilicate fiber board and rock wool are respectively compounded with gypsum slurry. Therefore, the inorganic fibers incorporated in the compounded gypsum slurry are ceramic fibers and basalt fibers respectively. From Figure 3 and Figure 4 it can be seen that the fiber types used for the insulation board and the fireproof board are the same, and the two can be intertwined better and have a stronger bonding force.

[0079] According to the test method of GB / T 10294 of the national standard, the thermal conductivity of the fireproof and heat-insulating integrated board prepared in Example 1 is as low as 0.1 W / (m·K), and the thermal conductivity of the fireproof and heat-insulating integrated board prepared in Example 2 is as low as 0.13 W / (m·K).

[0080] According to the test method of BS 476: Part 22, the fire resistance limit of the fireproof and heat-insulating integrated board prepared in Example 1 reached 2 hours and 25 minutes, and the integrity was good. The fire resistance limit measured in Example 2 reached 2 hours and 10 minutes, and the integrity was good.

[0081] According to the test method of the standard high compressive strength QJ 1634A, the tensile strength of the connecting joint in the fireproof and heat-insulating integrated board prepared in Example 1 was 4.5 MPa; the tensile strength of the connecting joint in the fireproof and heat-insulating integrated board prepared in Example 2 was 5 MPa.

[0082] According to the test method of the standard GB / T 17911, the heating permanent linear change of the fireproof and heat-insulating integrated board prepared in Example 1 was 0.5%, and the water content was as low as 0.3%; the heating permanent linear change of the fireproof and heat-insulating integrated board prepared in Example 2 was 0.3%, and the water content was as low as 0.3%.

Claims

1. A composite method for fireproof and heat-insulating integrated plates, characterized in that It is carried out in the following steps:

1. Weighing: Weigh 800 to 1000 parts of gypsum powder, 10 to 12 parts of modified starch ether, 20 to 30 parts of redispersible latex, 200 to 300 parts of gum arabic, 0.5 to 2.5 parts of citric acid retarder, 0.5 to 0.7 parts of organosilicon defoamer, 30 to 50 parts of inorganic fiber and 600 to 670 parts of water according to mass proportion; 2. Preparation of gypsum board slurry: 0.5 to 2.5 parts of citric acid retarder are mixed with 600 to 670 parts of water until completely dissolved, then 30 to 50 parts of inorganic fiber are added, stirred until the inorganic fiber is evenly dispersed, then 800 to 1000 parts of gypsum powder are added and stirred evenly, finally 10 to 12 parts of modified starch ether, 20 to 30 parts of redispersible latex, 200 to 300 parts of gum arabic and 0.5 to 0.7 parts of silicone defoamer are added in sequence and stirred evenly to obtain gypsum board slurry; 3. Casting and compounding: Pour the gypsum board slurry into the mold for initial setting to obtain the initial setting gypsum slurry, and then place the insulation board on the initial setting gypsum slurry to obtain the board to be pressed; 4. Pressurization: The sheet to be pressed is subjected to pressure treatment to obtain an initial setting pressurized sheet, and then the pressing pressure is increased to 3MPa-3.5MPa at a gradient of 0.5MPa / min-1MPa / min at a temperature of 20°C-25°C and a humidity of 60%-65%, and the pressing pressure is pressed for 3min-5min at a pressure of 3MPa-3.5MPa, and then the pressing pressure is increased to 4MPa-5MPa at a gradient of 0.5MPa / min-1MPa / min at a temperature of 20°C-25°C and a humidity of 60%-65%, and the pressing pressure is pressed for 5min-10min at a pressure of 4MPa-5MPa to obtain a pressurized sheet; 5. Demolding: The pressurized board is left to stand at room temperature until it is completely solidified, then demoulded and dried to obtain a fireproof and heat-insulating integrated board.

2. A method for compounding a fireproof and heat-insulating integrated board according to claim 1, characterized in that The redispersible latex described in step 1 is polyvinyl acetate.

3. A method for composite of fireproof and heat-insulating integrated board according to claim 1, characterized in that The organosilicon defoamer described in step 1 is polydimethylsiloxane.

4. A method for composite of fireproof and heat-insulating integrated board according to claim 1, characterized in that The inorganic fiber described in step one is glass fiber, ceramic fiber or basalt fiber, with a length of 3mm to 5mm and a diameter of 2μm to 3μm; the insulation board described in step three is rock wool board or aluminum silicate fiber board.

5. A method for composite of fireproof and heat-insulating integrated board according to claim 4, characterized in that The inorganic fibers described in step one are of the same type as the fibers in the insulation board described in step three.

6. A method for composite of fireproof and heat-insulating integrated board according to claim 1, characterized in that Step 3: Pour the gypsum board slurry into the mold and vibrate it with a vibrator until the surface of the slurry is level and there are no obvious bubbles.

7. A method for composite of fireproof and heat-insulating integrated board according to claim 1, characterized in that The initial setting described in step 3 is specifically to place the gypsum board slurry for 1 min to 2 min at a temperature of 20° C. to 25° C. and a humidity of 85% to 90%.

8. A method for composite of a fireproof and heat-insulating integrated board according to claim 1, characterized in that In step 4, the sheet to be pressed is pressed for 1 min to 2 min under the conditions of a temperature of 20° C. to 25° C., a humidity of 60% to 80% and a pressing pressure of 1 MPa to 1.5 MPa to obtain an initially set pressurized sheet.

9. A method for composite of fireproof and heat-insulating integrated board according to claim 1, characterized in that The drying described in step 5 is specifically carried out at a temperature of 55° C. to 60° C. for 24 h to 30 h.

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