CN111778765A - High-heat-resistance mica paper and manufacturing method thereof - Google Patents
High-heat-resistance mica paper and manufacturing method thereof Download PDFInfo
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- CN111778765A CN111778765A CN202010563831.5A CN202010563831A CN111778765A CN 111778765 A CN111778765 A CN 111778765A CN 202010563831 A CN202010563831 A CN 202010563831A CN 111778765 A CN111778765 A CN 111778765A
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- Prior art keywords
- mica
- paper
- treatment
- mica paper
- pulp
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/38—Inorganic fibres or flakes siliceous
- D21H13/44—Flakes, e.g. mica, vermiculite
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/56—Insulating bodies
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/04—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances mica
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
The invention provides a method for manufacturing high-heat-resistance mica paper, which comprises the following steps: 1) carrying out heat treatment on the mica material for two times; 2) crushing the mica material after the heat treatment twice to obtain mica pulp sheets; 3) the mica pulp sheet is treated by three-way cyclone rotational flow and three-way grading sieve grading; 4) carrying out high magnetic adsorption treatment on the screened mica pulp sheet; 5) uniformly mixing the mica pulp sheet subjected to adsorption treatment with a high-heat-resistance material to obtain mica pulp; 6) extracting the mica pulp into a cylinder mould machine for papermaking; 7) drying the manufactured mica paper, performing calendaring treatment after cooling treatment by a group of cold cylinders, and then reeling and cutting the mica paper. The high heat resistance material is added in the paper making process by optimizing the process, so that the heat resistance of the mica paper prepared by the process is greatly improved, the electrical performance is not changed due to the addition of the high heat resistance filler and the change of the mica content, the excellent characteristics of the common mica paper are maintained, and the high heat resistance effect is achieved.
Description
Technical Field
The invention belongs to the technical field of mica paper manufacturing, and particularly relates to high-heat-resistance mica paper and a manufacturing method thereof.
Background
Natural mica has excellent physical and chemical stability, especially good insulating properties. The mica paper is a paper-like non-metal insulating material which is made up by using broken mica as raw material and combining the van der Waals force between mica scales and electrostatic attraction force together, and can retain the properties of high-temp. resistance, high-pressure resistance, insulation resistance and corona resistance of natural mica, in particular its high-temp. resistance and reprocessing property can not be substituted by other materials.
In some high-temperature environments, certain heat resistance effect on temperature is required, and normal operation of circuits or instrument equipment in the high-temperature environments is guaranteed. The mica tape made of the high-heat-resistance mica paper is applied to the heat-resistance layers of the wind motor, the hydroelectric generator and the large motor, so that the operation, maintenance and service time of the large generator and the motor can be effectively prolonged, and the service life of the large generator and the motor can be effectively prolonged; high-resistance thermal insulation materials have great application requirements on materials used in the manned aerospace industry, unmanned spacecrafts and rockets.
Disclosure of Invention
The invention aims to provide a method for manufacturing high heat resistance mica paper, which not only maintains the excellent characteristics of common mica paper, but also has high heat resistance effect.
Therefore, the invention provides a method for manufacturing high-heat-resistance mica paper, which comprises the following steps:
1) carrying out heat treatment on the mica material for two times;
2) crushing the mica material subjected to heat treatment twice to obtain mica slurry sheets;
3) the crushed mica pulp sheets are subjected to cyclone treatment by a three-way cyclone and grading treatment by a three-way grading sieve;
4) adsorbing the screened mica pulp sheet by high magnetism;
5) introducing the mica pulp sheets subjected to adsorption treatment into a fine pulp tank, adding a high-heat-resistance material into the fine pulp tank, and uniformly stirring to obtain mica pulp;
6) extracting the mica pulp into a cylinder mould machine for papermaking;
7) drying the mica paper manufactured in the step 6) to enable the water content of the mica paper to be below 0.3%, cooling the mica paper by a group of cold cylinders, performing calendaring treatment by calendaring equipment, and winding and cutting the mica paper.
Further, the two heat treatment processes in the step 1) comprise the steps of firstly keeping the mica master batch at the temperature of 750-850 ℃ for 2 hours, then cooling the mica material to 260-300 ℃ and keeping the mica material for 1 hour.
Further, the crushing pressure of the two crushing treatments in the step 2) is 4.2-6 MPa and 2.5-4 MPa respectively.
Further, the rotational flow pressure of the rotational flow device in the step 3) is 2-3 MPa, and the grading sieve mesh number is 120-200 meshes.
Further, in the step 5), the high heat resistance material is a whisker of titanium oxide.
Further, the mass ratio of the high heat resistance material to the mica pulp sheet is 12: 1.
In addition, the invention also provides high-heat-resistance mica paper prepared by the preparation method.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the manufacturing method of the mica paper with high heat resistance, the high heat resistance whisker is added as a high heat resistance material in the papermaking process, so that the heat resistance of the mica paper prepared by the process is greatly improved, and the change of electrical properties caused by the change of mica content due to the addition of the high heat resistance filler is avoided, so that the excellent characteristics of common mica paper are maintained, and meanwhile, the mica paper has a high heat resistance effect; the mica tape can be made into a mica tape to be applied to wind motors, hydroelectric generators and large-scale motor heat-resistant layers, so that the service lives of the large-scale generators and the motors are effectively prolonged, and the mica tape has great application requirements on materials for manned aerospace industry, unmanned spacecrafts and rockets.
(2) According to the manufacturing method of the high-heat-resistance mica paper, the temperature of the paper surface is cooled by adding a group of cold cylinders at the end of the mica paper drying treatment, so that the speed of reducing the temperature in the paper roll is increased, and the smoothness of the finished paper is improved.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment provides a method for manufacturing high-heat-resistance mica paper, which comprises the following specific processes:
(1) the mica material is subjected to two heat treatments, on one hand, non-mica impurity components can be treated through the two heat treatments, and on the other hand, crystal water among the mica materials is activated through the two heat treatments so as to improve the diameter-thickness ratio of the mica pulp sheet. Specifically, the mica material is treated at the temperature of 750-850 ℃ for 2 hours, and then the mica material is cooled to 260-300 ℃ and kept for 1 hour.
(2) Crushing the mica material subjected to heat treatment twice to obtain mica slurry sheets; the two-time crushing treatment is beneficial to improving the diameter-thickness ratio of the scales, increasing the combination area between the scales and increasing the electrostatic attraction effect between the scales. Specifically, the first crushing pressure is 4.2-6 MPa, and the second crushing pressure is 2.5-4 MPa.
(3) The crushed mica pulp sheet is subjected to classification treatment by three cyclones and three classifying screens, fine scales are removed by screening, and large scales are reserved to improve the void ratio, so that the subsequent combination of the mica pulp sheet and a high-heat-resistance material is facilitated. Specifically, the cyclone pressure of the cyclone is 2-3 MPa, and the grading sieve mesh number is 120-200 meshes.
(4) And adsorbing the screened mica pulp sheet by high magnetism, treating metal ions in the mica pulp sheet, and simultaneously cultivating and activating static electricity among the scales so as to be beneficial to the combination of the subsequent mica pulp sheet and a high-heat-resistance material.
(5) And (3) introducing the mica pulp sheet subjected to adsorption treatment into a fine pulp tank, adding a high-heat-resistance material into the fine pulp tank, and uniformly stirring to obtain the mica pulp. The high-heat-resistance material adopts the methyl titanate whisker, and the mass ratio of the high-heat-resistance material to the mica pulp sheet is 12: 1.
(6) And extracting the mica pulp into a cylinder mould machine for papermaking.
(7) And (3) drying the mica paper manufactured in the step (6) to enable the water content of the mica paper to be below 0.3%, cooling the mica paper by a group of cold cylinders, performing calendaring treatment by calendaring equipment to improve the density and the paper surface smoothness of the mica paper, and finally coiling and cutting the calendered mica paper into finished paper with the specification required by a customer.
The mica paper manufactured by the method of the embodiment has the thermal conductivity not more than 0.1W/mK and excellent heat insulation performance.
In conclusion, the manufacturing method of the mica paper with high heat resistance provided by the invention has the advantages that the mica paper prepared by the process has greatly improved heat resistance by adding the methyl titanate whiskers as the high heat resistance material in the paper making process, and the electrical performance is not changed due to the addition of the high heat resistance filler and the change of the mica content, so that the excellent characteristics of the common mica paper are maintained, and meanwhile, the mica paper has high heat resistance effect; meanwhile, a group of cold cylinders are added at the end of mica paper drying treatment to cool the temperature of the paper surface, so that the temperature reduction speed in the paper roller is increased, and the smoothness of finished paper is improved.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (7)
1. A manufacturing method of high-heat-resistance mica paper is characterized by comprising the following steps:
1) carrying out heat treatment on the mica material for two times;
2) crushing the mica material subjected to heat treatment twice to obtain mica slurry sheets;
3) the crushed mica pulp sheets are subjected to cyclone treatment by a three-way cyclone and grading treatment by a three-way grading sieve;
4) adsorbing the screened mica pulp sheet by high magnetism;
5) introducing the mica pulp sheets subjected to adsorption treatment into a fine pulp tank, adding a high-heat-resistance material into the fine pulp tank, and uniformly stirring to obtain mica pulp;
6) extracting the mica pulp into a cylinder mould machine for papermaking;
7) drying the mica paper manufactured in the step 6) to enable the water content of the mica paper to be below 0.3%, cooling the mica paper by a group of cold cylinders, performing calendaring treatment by calendaring equipment, and winding and cutting the mica paper.
2. The method for manufacturing the high heat resistance mica paper according to claim 1, wherein the two heat treatment processes in the step 1) are that the mica material is firstly kept at the temperature of 750-850 ℃ for 2 hours, and then the mica material is cooled to the temperature of 260-300 ℃ and kept for 1 hour.
3. The method for manufacturing the mica paper with high heat resistance according to claim 1, wherein the crushing pressures of the two crushing treatments in the step 2) are respectively 4.2-6 MPa and 2.5-4 MPa.
4. The method for manufacturing the high heat resistance mica paper according to claim 1, wherein the swirling pressure of the swirler in the step 3) is 2-3 MPa, and the grading mesh number is 120-200 meshes.
5. The method for manufacturing the mica paper with high heat resistance according to claim 1, wherein the high heat resistance material in the step 5) is whisker of titanium oxide.
6. The method for manufacturing the mica paper according to claim 5, wherein the mass ratio of the high heat resistant material to the mica pulp sheets is 12: 1.
7. A high heat resistant mica paper produced by the production method according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010563831.5A CN111778765A (en) | 2020-06-19 | 2020-06-19 | High-heat-resistance mica paper and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010563831.5A CN111778765A (en) | 2020-06-19 | 2020-06-19 | High-heat-resistance mica paper and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111778765A true CN111778765A (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010563831.5A Pending CN111778765A (en) | 2020-06-19 | 2020-06-19 | High-heat-resistance mica paper and manufacturing method thereof |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113430864A (en) * | 2021-05-25 | 2021-09-24 | 上海同立电工材料有限公司 | High-heat-resistance mica paper and manufacturing method thereof |
| CN114197239A (en) * | 2021-12-01 | 2022-03-18 | 湖北平安电工科技股份公司 | Manufacturing method of high-heat-resistance mica plate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070292673A1 (en) * | 2004-11-24 | 2007-12-20 | Yuji Katagiri | Inorganic Fiber Paper |
| CN104631200A (en) * | 2015-01-28 | 2015-05-20 | 陕西科技大学 | Polyimide fiber paper with potassium titanate whiskers, and preparation method of polyimide fiber paper |
| CN106996053A (en) * | 2017-03-17 | 2017-08-01 | 湖北平安电工材料有限公司 | A kind of high heat conduction mica paper manufacture method |
| CN107740178A (en) * | 2017-11-17 | 2018-02-27 | 武汉科技大学 | A kind of crystal whisker of hexa potassium titanate heat-barrier material and preparation method thereof |
-
2020
- 2020-06-19 CN CN202010563831.5A patent/CN111778765A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070292673A1 (en) * | 2004-11-24 | 2007-12-20 | Yuji Katagiri | Inorganic Fiber Paper |
| CN104631200A (en) * | 2015-01-28 | 2015-05-20 | 陕西科技大学 | Polyimide fiber paper with potassium titanate whiskers, and preparation method of polyimide fiber paper |
| CN106996053A (en) * | 2017-03-17 | 2017-08-01 | 湖北平安电工材料有限公司 | A kind of high heat conduction mica paper manufacture method |
| CN107740178A (en) * | 2017-11-17 | 2018-02-27 | 武汉科技大学 | A kind of crystal whisker of hexa potassium titanate heat-barrier material and preparation method thereof |
Non-Patent Citations (1)
| Title |
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| 章桥新等: "新型高温复合隔热纸的制备与性能研究", 《中国造纸》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113430864A (en) * | 2021-05-25 | 2021-09-24 | 上海同立电工材料有限公司 | High-heat-resistance mica paper and manufacturing method thereof |
| CN114197239A (en) * | 2021-12-01 | 2022-03-18 | 湖北平安电工科技股份公司 | Manufacturing method of high-heat-resistance mica plate |
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Application publication date: 20201016 |
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