Manufacturing method of ultra-thin microporous fire-resistant heat insulation plate

Abstract

The invention relates to the technical field of refractory slab processing, in particular to a manufacturing method of an ultra-thin microporous refractory insulation board, which comprises the following steps: mixing raw materials at a high speed, exhausting to fully cure clinker, and exhausting gas in the raw materials to facilitate later pressing. The density of the primary plate is improved; and the internal stress uniformity of the plate is ensured. In the plate forming stage, the thickness of a primary plate is larger than that of a finished plate, and the margin of secondary rolling in the later period is reserved through the design. According to the invention, after the primary plate is obtained, the primary plate is loaded into the vacuum barrier bag for vacuum packaging, and then the secondary rolling is carried out, so that the toughness of the primary plate is improved by utilizing the vacuum barrier bag, the whole plate is prevented from being broken or broken in the rolling forming step, and the plate can be rolled to be thinner without being damaged. And through vacuum film coating treatment, the finished board does not need to be subjected to secondary packaging and packaging subsequently, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of refractory board processing, and in particular to a method for manufacturing an ultra-thin microporous refractory insulation board. Background Art

[0002] With the continuous development of society and the advancement of science and technology, some precision equipment, instruments and components with very strict volume requirements have emerged. It is undoubtedly a difficult problem to add thermal insulation materials to these equipment, instruments and components with very limited volume and space for thermal insulation and fire protection. At present, there are also some ultra-thin thermal insulation materials on the market, such as thermal insulation paper and thermal insulation felt. The thermal insulation performance of these ultra-thin thermal insulation materials is not ideal. Either the thermal insulation performance is poor but the fireproof performance is good, and the two cannot be balanced.

[0003] With the development of the industry, microporous heat-resistant insulation material is one of the most excellent insulation materials on the market. It has excellent thermal insulation and fireproof properties, but its conventional thickness is ≥5mm, and it cannot be used in the space where the gap of the fireproof insulation layer is ≤3mm. At present, microporous heat-resistant insulation material cannot achieve the specification of thickness ≤3mm. The main reason is that it is largely restricted by the existing production process. In addition, microporous heat-resistant insulation material is generally formed by hot pressing of powder material, which leads to internal stress in the formed plate during the hot pressing process. Since the plate is relatively thin and relatively brittle, during the hot pressing cooling of the plate or in the later use process, the stress inside the plate under the action of external force can easily cause the plate to rupture, thereby affecting the thermal insulation effect of the entire equipment. Summary of the invention

[0004] To achieve the above object, the present invention provides a method for manufacturing an ultra-thin microporous fire-resistant insulation board, comprising the following steps:

[0005] Raw material mixing: conveying inorganic non-metallic oxides, inorganic additives and inorganic fibers to a mixer in a mass ratio of 50%-85%: 5%-30%: 1%-6% for depolymerization and mixing, the line speed of depolymerization and mixing is 2300-4400m / min, the mixing time is 200-600s, and clinker is obtained;

[0006] Exhaust: Exhaust the clinker at normal temperature and pressure differential, and the exhaust time is at least 60s;

[0007] Sheet forming: The exhausted clinker is placed in a hydraulic mold frame forming machine for pressing at room temperature. The pressure during the pressing process is 0.5-3Mpa to obtain a primary sheet. The thickness of the primary sheet is 2-5 times that of the finished sheet.

[0008] Bagging: The primary sheet is placed in a vacuum barrier bag, evacuated and sealed. The vacuum degree of the vacuum barrier bag is less than 200Pa, and the sealing pressure of the vacuum barrier bag is 0.3-0.6Mpa to obtain a packaged sheet;

[0009] Rolling forming: The packaged sheet is placed in a roller press and rolled in a multi-stage rolling manner. The rolling pressure gradually increases as the thickness of the sheet becomes thinner, until the rolling thickness is less than or equal to the preset thickness, thereby obtaining an insulation board;

[0010] Finished product lamination treatment: vacuum lamination is performed on the outside of the insulation board at a lamination temperature of 120-180°C for 5-15 minutes to obtain a finished board.

[0011] In some possible implementations, in the roll-forming step, the packaging sheet needs to be rolled at least twice, with the thickness reduction of each rolling being 0.5-2.0 mm, and the thickness of the last rolling needs to be less than or equal to a preset thickness.

[0012] In some possible implementations, in the roll-forming step, the initial roll-pressing pressure is at least 0.8 MPa.

[0013] In some possible implementations, the vacuum barrier bag has a bag body thickness of 50-100 μm.

[0014] In some possible implementations, the specific steps of the vacuum coating are:

[0015] Preheat the tunnel oven to 120-180℃, place the insulation board into the tunnel oven, keep warm for 5-15 minutes, take it out and quickly cool it to room temperature.

[0016] In some possible implementations, the vacuum barrier bag is made of PE combined with one or more materials selected from NY, PET, VMPET, and AL.

[0017] In some possible implementations, during the bagging step, a heat-sealing layer needs to be added to the opening of the vacuum barrier bag and heat-sealed to connect the two sides of the opening of the vacuum barrier bag.

[0018] In some possible implementations, the inorganic non-metallic oxide is one or two of silicon oxide, magnesium oxide, and aluminum oxide.

[0019] In some possible implementations, the inorganic fiber is one or two of glass fiber, high silica fiber, quartz fiber, basalt fiber, and carbon fiber.

[0020] The beneficial effects of the present invention are as follows: after the raw materials are mixed at high speed, the manufacturing method of the present invention fully matures the clinker by exhausting the gas, and at the same time, the gas in the raw materials is discharged, which is conducive to the later pressing, improving the density of the primary board and ensuring the uniform stress inside the board. In the board forming stage, the thickness of the primary board is greater than that of the finished board. Such a design reserves the margin for the later secondary rolling. After the primary board is obtained, it is placed in a vacuum barrier bag for vacuum packaging, and then a secondary rolling is performed. Such a design uses a vacuum barrier bag to increase the toughness of the primary board, avoids the entire board from breaking or fragmenting during the rolling forming step, and ensures that the board can be rolled thinner without damage. After the insulation board is obtained, a vacuum coating operation is performed. The newly formed film layer outside the vacuum barrier bag can improve the protective ability of the vacuum barrier bag, and at the same time further increase the toughness of the entire formed board, which can reduce the breakage rate and ensure that the overly thin structure has sufficient compression and tensile resistance. Through the vacuum coating process, the finished board does not need to be subsequently packaged and encapsulated, which reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1 A method for manufacturing an ultra-thin microporous fire-resistant insulation board comprises the following steps:

[0025] Raw material mixing: conveying inorganic non-metallic oxides, inorganic additives and inorganic fibers to a mixer in a mass ratio of 50%-85%: 5%-30%: 1%-6% for depolymerization and mixing, the line speed of depolymerization and mixing is 2300-4400m / min, the mixing time is 200-600s, and clinker is obtained;

[0026] Exhaust: Exhaust the clinker at normal temperature and pressure differential, and the exhaust time is at least 60s;

[0027] Sheet forming: The exhausted clinker is placed in a hydraulic mold frame forming machine for pressing at room temperature. The pressure during the pressing process is 0.5-3Mpa to obtain a primary sheet. The thickness of the primary sheet is 2-5 times that of the finished sheet.

[0028] Bagging: The primary sheet is placed in a vacuum barrier bag, evacuated and sealed. The vacuum degree of the vacuum barrier bag is less than 200Pa, and the sealing pressure of the vacuum barrier bag is 0.3-0.6Mpa to obtain a packaged sheet;

[0029] Rolling forming: The packaged sheet is placed in a roller press and rolled in a multi-stage rolling manner. The rolling pressure gradually increases as the thickness of the sheet becomes thinner, until the rolling thickness is less than or equal to the preset thickness, thereby obtaining an insulation board;

[0030] Finished product lamination treatment: vacuum lamination is performed on the outside of the insulation board at a lamination temperature of 120-180°C for 5-15 minutes to obtain a finished board.

[0031] In the step of mixing raw materials, it is necessary to add depolymerization and mixing in multiple times. After each depolymerization and mixing, it is necessary to check whether the mixed clinker is depolymerized. The more raw materials are added each time, the higher the line speed of depolymerization and mixing, and the longer the duration. In the actual depolymerization and mixing process, in order to improve efficiency, the appropriate temperature can be selected according to the material and quantity of different inorganic additives and inorganic fibers. In addition, during the exhaust process, the stirring equipment can be used for regular stirring to facilitate the exhaust of the gas generated by the undepolymerized raw materials during the depolymerization process, so that it can be quickly extruded and dense in the later board forming step, while reducing the bulk density.

[0032] In addition, the inorganic non-metallic oxide can be one or two of silicon oxide, magnesium oxide, and aluminum oxide, the inorganic fiber can also be one or two of glass fiber, high silica fiber, quartz fiber, basalt fiber, and carbon fiber, and the inorganic additive can be an adhesive or a flame retardant and thermal insulation material, such as aluminum hydroxide, aluminum silicate, etc.

[0033] It should be noted that, in the sheet forming step, the thickness of the primary sheet is 2-5 times that of the finished sheet. The main purpose is to reserve rolling margin when performing high-intensity rolling in the subsequent rolling forming step. This also means that the primary sheet is only press-formed, which makes it easier to load the primary sheet into the vacuum barrier bag. In this way, during the first pressing, since it is not pressed and formed in one go, the internal stress of the primary sheet is relatively small and it is not easy to break, which is beneficial to improving the product rate and reducing production costs.

[0034] The manufacturing method of the ultra-thin microporous fire-resistant insulation board is to mix the raw materials at a high speed, and then exhaust the gas to fully mature the clinker, and at the same time discharge the gas in the raw materials, which is conducive to the later pressing, improving the density of the primary board and ensuring the uniform stress inside the board. In the board forming stage, the thickness of the primary board is greater than that of the finished board. Such a design reserves the margin for the later secondary rolling. After the primary board is obtained, it is placed in a vacuum barrier bag for vacuum packaging, and then a secondary rolling is performed. Such a design uses a vacuum barrier bag to increase the toughness of the primary board, avoids the entire board from breaking or breaking during the rolling forming step, and ensures that the board can be rolled thinner without damage. After the insulation board is obtained, a vacuum coating operation is performed. The newly formed film layer outside the vacuum barrier bag can improve the protective ability of the vacuum barrier bag, and at the same time further increase the toughness of the entire formed board, which can reduce the breakage rate and ensure that the overly thin structure has sufficient compressive and tensile resistance. Through the vacuum coating process, the finished board does not need to be subsequently packaged and encapsulated, which reduces the production cost.

[0035] In some possible implementations, the packaged sheet needs to be rolled at least twice in the roll forming step, and the thickness reduction of each roll is 0.5-2.0mm, and the thickness of the last roll needs to be less than or equal to the preset thickness. For example, if the thickness of the finished sheet is required to be 0.8-3mm, the thickness range of the packaged sheet is at least between 1.6-15mm, which is adapted to the aforementioned requirement that the thickness of the primary sheet is 2-5 times that of the finished sheet. At this time, if the thickness of the finished sheet is the minimum 0.8mm, the thickness reduction of each roll is also the minimum value, that is, 0.5mm; if the reserved thickness of the primary sheet is the maximum value of the finished sheet, the number of rolls needs to be increased accordingly, and if the reserved thickness of the primary sheet is the minimum value of the finished sheet, the number of rolls needs to be reduced accordingly. Of course, a nonlinear rolling method can be adopted, that is, the thickness of the first roll is the largest and the thickness of the last roll is the smallest. Since the density of the packaging sheet increases after each rolling, the difficulty of the subsequent rolling increases. Therefore, in the rolling forming step, the pressure of the subsequent rolling needs to be increased after each rolling. The pressure value increased each time is determined by the total number of rolling times. That is, if the total number of rolling times is small, the pressure value increased each time is relatively large. Conversely, the pressure value increased each time is relatively small.

[0036] In the above embodiment, the initial rolling pressure of the roll forming is at least 0.8 MPa. As the number of rolling rounds increases, the pressure value of each rolling increases by at least 0.2 MPa, which is determined according to the actual total number of rolling rounds.

[0037] In some possible implementations, in order to ensure the performance of the entire finished board while reducing the final thickness of the entire finished board, the bag body thickness of the vacuum barrier bag is 50-100 μm, that is, the inner wall thickness of the vacuum barrier bag is 50-100 μm.

[0038] In some possible implementations, the vacuum barrier bag is made of PE composite with one or more materials of NY, PET, VMPET, and AL, which can reduce the overall material cost. At the same time, the PE material has sufficient resistance to low temperatures, is widely available, is cheap, and has good stability at room temperature, so it can be used as the outer layer of the packaging board.

[0039] In some possible implementations, a heat-sealing layer needs to be added to the opening of the vacuum barrier bag during the bagging process to connect the two sides of the opening of the vacuum barrier bag. This design can increase the thickness of the heat-sealed portion of the vacuum barrier bag opening, avoid melting of the vacuum barrier bag opening during the hot-pressing packaging process and reduce the thickness, and to a certain extent ensure that the entire packaged sheet will not leak or be damaged during the roll-forming step. Of course, in actual operation, the above purpose can also be achieved by folding the opening of the vacuum barrier bag in half and then heat-sealing it.

[0040] It should be noted that the material of the vacuum barrier bag is mainly a composite material containing PE.

[0041] In some possible implementations, the specific steps of vacuum lamination are:

[0042] Preheat the tunnel oven to 120-180℃, place the insulation board into the tunnel oven, keep warm for 5-15 minutes, take it out and quickly cool it to room temperature.

[0043] Among them, the preferred preheating temperature of the tunnel oven in this application is 130°C, and the melting point of PE is 130°C. Since the interior of the insulation board is in a vacuum state, after being placed in the tunnel oven, the insulation board is gradually heated until it reaches 130°C. At this time, the PE on the vacuum barrier bag begins to gradually melt. Since the vacuum barrier bag is in a vacuum environment and the tunnel oven is at normal pressure, the melted PE will be directly extruded and attached to the surface of the primary sheet under the action of atmospheric pressure. During the entire heating process, it is necessary to control the heating time so that the entire vacuum barrier bag will not break, but part of the melted PE happens to be attached to the outside of the primary sheet. Of course, when the vacuum barrier bag is a composite material containing PE, its coating effect is better than that of pure PE material. Therefore, the vacuum barrier bag of this application is preferably made of PE composite NY, PET, VMPET, AL or one or more materials, and NY, PET, VMPET, AL all have a melting point higher than 130°C.

[0044] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for manufacturing an ultra-thin microporous fire-resistant insulation board, characterized in that: The following steps are involved: Raw material mixing: conveying inorganic non-metallic oxides, inorganic additives and inorganic fibers to a mixer in a mass ratio of 50%-85%: 5%-30%: 1%-6% for depolymerization and mixing, the line speed of depolymerization and mixing is 2300-4400m / min, the mixing time is 200-600s, and clinker is obtained; Exhaust: Exhaust the clinker at normal temperature and pressure differential, and the exhaust time is at least 60s; Sheet forming: The exhausted clinker is placed in a hydraulic mold frame forming machine for pressing at room temperature. The pressure during the pressing process is 0.5-3Mpa to obtain a primary sheet. The thickness of the primary sheet is 2-5 times that of the finished sheet. Bagging: The primary sheet is placed in a vacuum barrier bag, evacuated and sealed. The vacuum degree of the vacuum barrier bag is less than 200Pa, and the sealing pressure of the vacuum barrier bag is 0.3-0.6Mpa to obtain a packaged sheet; Rolling forming: The packaged sheet is placed in a roller press and rolled in a multi-stage rolling manner. The rolling pressure gradually increases as the thickness of the sheet becomes thinner, until the rolling thickness is less than or equal to the preset thickness, thereby obtaining an insulation board; Finished product lamination treatment: vacuum lamination operation is carried out on the outside of the insulation board, the lamination temperature is 120-180℃, the duration is 5-15min, and the finished board is obtained.

2. The method for manufacturing an ultra-thin microporous fire-resistant insulation board according to claim 1, characterized in that: In the roll forming step, the packaging sheet needs to be rolled at least twice, with the thickness reduction of each rolling being 0.5-2.0 mm, and the thickness of the last rolling needs to be less than or equal to the preset thickness.

3. The method for manufacturing an ultra-thin microporous fire-resistant insulation board according to claim 2, characterized in that: In the roll-forming step, the initial roll-pressing pressure is at least 0.8 MPa.

4. The method for manufacturing an ultra-thin microporous fire-resistant insulation board according to claim 1, characterized in that: The vacuum barrier bag has a bag body thickness of 50-100 μm.

5. The method for manufacturing an ultra-thin microporous fire-resistant insulation board according to claim 1, characterized in that: The specific steps of the vacuum coating are: Preheat the tunnel oven to 120-180℃, place the insulation board into the tunnel oven, keep warm for 5-15 minutes, take it out and quickly cool it to room temperature.

6. The method for manufacturing an ultra-thin microporous fire-resistant insulation board according to claim 1, characterized in that: The vacuum barrier bag is made of PE composite with one or more materials selected from NY, PET, VMPET and AL.

7. The method for manufacturing an ultra-thin microporous fire-resistant insulation board according to claim 1, characterized in that: In the bagging step, a heat-sealing layer needs to be added to the bag opening of the vacuum barrier bag and heat-sealed to connect the two sides of the bag opening of the vacuum barrier bag.

8. The method for manufacturing an ultra-thin microporous fire-resistant insulation board according to claim 1, characterized in that: The inorganic non-metallic oxide is one or two of silicon oxide, magnesium oxide and aluminum oxide.

9. The method for manufacturing an ultra-thin microporous fire-resistant insulation board according to claim 1, characterized in that: The inorganic fiber is one or two of glass fiber, high silica fiber, quartz fiber, basalt fiber and carbon fiber.

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