CN111058337A - Composite insulating forming part for oil-immersed transformer and manufacturing method thereof - Google Patents
Composite insulating forming part for oil-immersed transformer and manufacturing method thereof Download PDFInfo
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- CN111058337A CN111058337A CN202010013866.1A CN202010013866A CN111058337A CN 111058337 A CN111058337 A CN 111058337A CN 202010013866 A CN202010013866 A CN 202010013866A CN 111058337 A CN111058337 A CN 111058337A
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- composite insulating
- amino resin
- water
- paper
- fiber paper
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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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
- D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/02—Layered products comprising a layer of paper or cardboard next to a fibrous or filamentary layer
-
- 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
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
Abstract
The invention relates to a composite insulating forming part for an oil-immersed transformer and a manufacturing method thereof. The composite insulation forming part is formed by compounding and forming a surface layer, a bottom layer and a middle layer, wherein the middle layer is positioned between the surface layer and the bottom layer, the surface layer or the bottom layer is made of aramid fiber paper and/or polysulfonamide fiber paper, the binding surface of the aramid fiber paper or the polysulfonamide fiber paper and the middle layer is coated with water-soluble amino resin, and the middle layer is a wood pulp paper blank soaked with the water-soluble amino resin. The middle layer takes wood pulp as a main raw material, and the cost of the wood pulp is far lower than that of polysulfonamide fiber or aramid fiber, so that the cost is saved to a great extent. The invention further comprises a manufacturing method of the composite insulating molding part for the oil-immersed transformer.
Description
Technical Field
The invention relates to the technical field of insulating formed parts, in particular to a composite insulating formed part for an oil-immersed transformer and a manufacturing method thereof.
Background
With the gradual change of the manufacturing technology of the transformer in China and the increasing requirement on the adaptability of the using environment condition of the power transformer in China, the manufacturing of the special-shaped insulating part for leading wire, outgoing wire or supporting insulation of the transformer in an oil immersion state under the B-level insulating condition is provided, and the special-shaped insulating part serving as an economical key insulating part manufactured by the B-level transformer is a vital task for solving the economic problem of expensive materials in scientific and technological development and resolution and meeting the market development requirement.
At present, most of all-aramid fiber or all-polysulfonamide fiber paperboards adopted at home and abroad are degraded and used, the price is high, and the price is difficult to bear by users.
Disclosure of Invention
In order to solve the technical problems, the invention provides a composite insulating formed part and a manufacturing method thereof.
The invention provides a composite insulating molded part which is formed by compounding and molding a surface layer, a bottom layer and a middle layer, wherein the middle layer is positioned between the surface layer and the bottom layer, the surface layer and the bottom layer are made of aramid fiber paper or polysulfonamide fiber paper, the binding surface of the aramid fiber paper or polysulfonamide fiber paper and the middle layer is coated with water-soluble amino resin, and the middle layer is a wood pulp paper blank soaked with the water-soluble amino resin.
Preferably, the concentration of the water-soluble amino resin is 5% -10%.
Preferably, the moisture content of the wood pulp paper base is 70% -75%.
The invention also provides a manufacturing method of the composite insulating molding part, which is characterized by comprising the following steps of:
s1, soaking the wood pulp paper blank in water-soluble amino resin;
s2, coating water-soluble amino resin on one surface of aramid fiber paper or polysulfonamide fiber paper;
and S3, stacking the wood pulp paper blank impregnated with the water-soluble amino resin obtained in the step S1 as a middle layer, and aramid fiber paper or polysulfonamide fiber paper coated with the water-soluble amino resin on one surface in the step S2 as a surface layer and a bottom layer, wherein the surface coated with the water-soluble amino resin in the aramid fiber paper or polysulfonamide fiber paper is attached to the wood pulp paper blank, and performing hot press molding to obtain the composite insulating molded part.
Preferably, in step S1, the wood pulp paper base is soaked in the water-soluble amino resin for 10-30 min.
Preferably, in step S1, the wood pulp web is soaked in a water-soluble amino resin with a concentration of 5% to 10%.
Preferably, in step S3, the composite insulating molded article is obtained by hot press molding at a temperature of 130 to 150 ℃.
Preferably, in step S3, the composite insulating molded article is obtained by hot press molding under a unit area pressure of 1.5 to 4.0 MPa. Further, the composite insulating molded part is a molded composite insulating molded part.
More preferably, in step S3, the composite insulating molded article is obtained by hot press molding at a unit area pressure of 0.2 to 0.6 MPa. Further, the composite insulating molded part is a special-shaped composite insulating molded part.
Preferably, after the step S3, the method further includes pre-drying the composite insulating molded part obtained in the step S3 at a temperature of 70 ℃ to 80 ℃ for 4 to 8 hours, and then drying at a temperature of 95 ℃ to 105 ℃ for 10 to 24 hours.
Compared with the prior art, the invention has the advantages that: the composite paper is formed by compounding and molding a surface layer, a bottom layer and a middle layer, wherein the middle layer is positioned between the surface layer and the bottom layer, the surface layer or the bottom layer is aramid fiber paper and/or polysulfonamide fiber paper, the binding surface of the aramid fiber paper or the polysulfonamide fiber paper and the middle layer is coated with water-soluble amino resin, and the middle layer is a wood pulp paper blank soaked with the water-soluble amino resin. The free electron pair on the nitrogen atom in the amino resin has strong polarity, and forms strong electron polarization effect with the hydroxyl in the natural wood pulp fiber, so that the stability of the wood pulp fiber is improved, and the energy required by hydroxyl separation is improved, thereby improving the temperature resistance and uniformity of the natural fiber; the two surfaces of the wood pulp paper blank are compositely sealed by aramid fiber paper or polysulfonamide fiber paper coated with water-soluble amino resin, so that a higher temperature-resistant layer sealing surface is formed, and the corrosion of free radicals in oil to the paper board in a high-temperature state is isolated and blocked, so that the service life of the insulating paper board in a high-temperature working state of the transformer is prolonged. The middle layer takes wood pulp as a main raw material, and the cost of the wood pulp is far lower than that of polysulfonamide fiber or aramid fiber, so that the cost is saved to a great extent. The prepared composite insulating molded part is a B-grade insulating molded part and can resist the high temperature of 130 ℃.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to make the aforementioned objects, features and advantages of the invention more comprehensible. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The embodiment provides a composite insulation forming part, which is formed by compounding and forming a surface layer, a bottom layer and a middle layer, wherein the middle layer is positioned between the surface layer and the bottom layer, the surface layer and the bottom layer are made of aramid fiber paper or polysulfonamide fiber paper, the binding surface of the aramid fiber paper or polysulfonamide fiber paper and the middle layer is coated with water-soluble amino resin, and the middle layer is a wood pulp paper blank impregnated with water-soluble amino resin with the concentration of 5% -10%. Wherein the water content of the wood pulp paper base is 70-75%.
The embodiment also provides a manufacturing method of the composite insulating molded part, which comprises the following steps:
s1, soaking the wood pulp paper blank in water-soluble amino resin with the concentration of 5% -10% for 10-30 min;
s2, coating water-soluble amino resin on one surface of aramid fiber paper or polysulfonamide fiber paper;
s3, stacking the wood pulp paper blank impregnated with the water-soluble amino resin obtained in the step S1 as a middle layer, and stacking the aramid fiber paper or polysulfonamide fiber paper coated with the water-soluble amino resin on one surface of the wood pulp paper blank in the step S2 as a surface layer and a bottom layer, wherein the surface of the aramid fiber paper or polysulfonamide fiber paper coated with the water-soluble amino resin is attached to the wood pulp paper blank, the thickness ratio of the dried molded product to the wood pulp paper blank is 1: 2.5-4.0, and in a temperature range of 130-150 ℃, setting appropriate press pressure according to the density requirement of the molded product (the unit surface pressure of the low-density molded product is 1.5-2.0 MPa, the unit surface pressure of the medium-density molded product is 2.0-3.0 MPa, and the unit surface pressure of the high-density molded product is 3.0-4.0 MPa), squeezing and dehydrating, and setting hot-pressing drying time according to the thickness of the final; and finally, preparing a high-quality die-pressing insulating forming part suitable for the oil-immersed transformer with the B-level insulation after cooling, cutting and fine trimming, inspection and packaging.
Or after the surface of the aramid fiber paper or polysulfonamide fiber paper coated with the water-soluble amino resin is attached to the wood pulp paper blank, the wood pulp paper blank is manually molded on a corresponding mold in a vacuum mode according to the shape required by a client, then the wood pulp paper blank is subjected to isobaric encryption, proper encryption pressure is set according to the density requirement of the molded part (the unit pressure of a low-density molded part is 0.2-0.3 MPa, the unit pressure of a medium-density molded part is 0.3-0.4 MPa, the unit pressure of a high-density molded part is 0.5-0.6 MPa), the pre-drying is carried out for 4-8 hours at 70-80 ℃, the pre-drying is carried out for 10-24 hours at the temperature of 95-105 ℃, the shape preserving, drying and shaping are carried out, and finally the high-quality special-shaped insulating molded part suitable for the oil-immersed transformer with the. The insulating molded part has excellent insulating properties and heat resistance. The composite insulation forming part suitable for the B-level insulation oil-immersed power transformer becomes a novel composite insulation forming part suitable for the market.
The invention provides a method for manufacturing a composite insulation forming piece, which integrates the composite forming technology of natural fiber wet paper blank and high-temperature-resistant synthetic fiber paper, the temperature-resistant modification technology of amino resin of the natural fiber wet paper blank, on the basis of the existing manufacturing process of the ultrahigh voltage insulation forming part, the composite forming of high-quality natural organic fiber wet paper blanks and high-temperature resistant synthetic fibers is carried out, the temperature resistance of the insulation forming part is improved, and the wet paper blank is impregnated with amino resin with the effect of improving the stability, the temperature resistance and the uniformity of the natural fiber are further improved, the aramid paper sheets or the polysulfonamide paper sheets are covered on the surface layers of the natural fiber paper blanks to form a closed surface of a higher temperature-resistant layer, so that the corrosion of free radicals in oil to the paper board at a high temperature is isolated and blocked, therefore, the temperature resistance and the service life of the insulating paper insulating forming part of the transformer in a high-temperature working state are improved.
The aramid fiber paper and the polysulfonamide fiber paper are long-term verified insulating materials with the grade above F, and the heat aging resistance of the aramid fiber paper and the polysulfonamide fiber paper is undoubted; the free electron pair on the nitrogen atom in the amino resin has strong polarity, and forms strong electron polarization effect with the hydroxyl in the natural wood pulp fiber, so that the stability of the wood pulp fiber is improved, and the energy required by hydroxyl separation is improved. Thus, it was verified experimentally that: the amino resin impregnation is carried out on the existing natural paper insulating material, the aramid fiber paper composite sealing is carried out on the two surfaces of the existing natural paper insulating material, the highest working temperature of the original pure wood pulp fiber insulating formed part is increased from 105 ℃ to 130 ℃, the temperature resistance of the insulating formed part is improved, and the heat resistance requirement of a B-grade insulating oil-immersed transformer in China on basic parts is met. The method comprises the steps of utilizing the existing high-temperature resistant fiber paper resources in China and the high-quality ultra-high voltage natural insulation paper pulp wet paper blank resources owned by companies, adopting the existing insulation molding part production line of companies, selecting thin aromatic (sulfone) polyamide fiber paper with the thickness of 0.1mm according with the requirement, soaking the high-quality natural wood pulp fiber wet paper blank and the aromatic (sulfone) polyamide fiber paper which need to be cut according to the compression ratio in water-soluble amino resin, forming sandwich type surface lamination, and then sending the paper blank and the aromatic (sulfone) polyamide fiber paper into a hot mold molding system for mold pressing and drying molding; or after manual molding on a mold in a shape according to the requirements of customers, carrying out isobaric encryption, shape-preserving drying and shaping, carrying out machine-out cooling, (demolding) cutting and fine-trimming, and inspecting to prepare the high-quality insulating molded part suitable for the oil-immersed transformer with the B-level insulation. The insulating molded part has excellent insulating properties and heat resistance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
Claims (10)
1. The composite insulation forming piece is characterized by being formed by compounding and forming a surface layer, a bottom layer and a middle layer, wherein the middle layer is positioned between the surface layer and the bottom layer, the surface layer and the bottom layer are made of aramid fiber paper or polysulfonamide fiber paper, the binding surface of the aramid fiber paper or polysulfonamide fiber paper and the middle layer is coated with water-soluble amino resin, and the middle layer is a wood pulp paper blank soaked with the water-soluble amino resin.
2. The composite insulating molding according to claim 1, wherein the concentration of the water-soluble amino resin is 5% to 10%.
3. The composite insulation form of claim 1 wherein the wood pulp paper stock has a moisture content of 70% to 75%.
4. A method of making a composite insulating shaped part according to any of claims 1 to 3, comprising the steps of:
s1, soaking the wood pulp paper blank in water-soluble amino resin;
s2, coating water-soluble amino resin on one surface of aramid fiber paper or polysulfonamide fiber paper;
and S3, stacking the wood pulp paper blank impregnated with the water-soluble amino resin obtained in the step S1 as a middle layer, and aramid fiber paper or polysulfonamide fiber paper coated with the water-soluble amino resin on one surface in the step S2 as a surface layer and a bottom layer, wherein the surface coated with the water-soluble amino resin in the aramid fiber paper or polysulfonamide fiber paper is attached to the wood pulp paper blank, and performing hot press molding to obtain the composite insulating molded part.
5. The method of manufacturing a composite insulating molded article according to claim 4, wherein in step S1, the wood pulp paper base is soaked in the water-soluble amino resin for 10 to 30 min.
6. The method of manufacturing a composite insulating molded article according to claim 4, wherein in step S1, the wood pulp paper base is soaked in a water-soluble amino resin having a concentration of 5% to 10%.
7. The method of manufacturing a composite insulating molded article according to claim 4, wherein in step S3, the composite insulating molded article is obtained by hot press molding at a temperature of 130 ℃ to 150 ℃.
8. The method of manufacturing a composite insulating molded article according to claim 4, wherein in step S3, the composite insulating molded article is obtained by hot press molding at a unit area pressure of 1.5 to 4.0 MPa.
9. The method of manufacturing a composite insulating molded article according to claim 4, wherein in step S3, the composite insulating molded article is obtained by hot press molding at a unit area pressure of 0.2 to 0.6 MPa.
10. The method of manufacturing a composite insulating molded article according to claim 4, further comprising, after step S3, pre-drying the composite insulating molded article obtained in step S3 at a temperature of 70 ℃ to 80 ℃ for 4 to 8 hours, and then drying at a temperature of 95 ℃ to 105 ℃ for 10 to 24 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010013866.1A CN111058337B (en) | 2020-01-07 | 2020-01-07 | Composite insulating forming part for oil-immersed transformer and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010013866.1A CN111058337B (en) | 2020-01-07 | 2020-01-07 | Composite insulating forming part for oil-immersed transformer and manufacturing method thereof |
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| Publication Number | Publication Date |
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| CN111058337A true CN111058337A (en) | 2020-04-24 |
| CN111058337B CN111058337B (en) | 2022-03-15 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4572859A (en) * | 1980-05-26 | 1986-02-25 | Kanegafuchi Kagaku Kogyo Kabushiki Kaisha | Electrical laminate comprising a plurality of fibrous layers and cured resin layers |
| WO2007020726A1 (en) * | 2005-08-19 | 2007-02-22 | Asahi Kasei Kabushiki Kaisha | Laminate and process for producing the same |
| CN101458983A (en) * | 2009-01-05 | 2009-06-17 | 中电电气集团有限公司 | Insulation laminated paper board and preparation thereof |
| US20150371730A1 (en) * | 2014-06-20 | 2015-12-24 | Hitachi, Ltd. | Electrical Insulating Paper and Stationary Induction Electrical Apparatus Using the Same |
| CN106223104A (en) * | 2016-07-27 | 2016-12-14 | 陕西科技大学 | A kind of method using PSA fiber to prepare aramid fiber extrusion coating paper |
| CN107867035A (en) * | 2017-10-25 | 2018-04-03 | 苏州巨峰电气绝缘系统股份有限公司 | A kind of H of resistance to gear box oil levels slot insulation material and its application |
-
2020
- 2020-01-07 CN CN202010013866.1A patent/CN111058337B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4572859A (en) * | 1980-05-26 | 1986-02-25 | Kanegafuchi Kagaku Kogyo Kabushiki Kaisha | Electrical laminate comprising a plurality of fibrous layers and cured resin layers |
| WO2007020726A1 (en) * | 2005-08-19 | 2007-02-22 | Asahi Kasei Kabushiki Kaisha | Laminate and process for producing the same |
| CN101458983A (en) * | 2009-01-05 | 2009-06-17 | 中电电气集团有限公司 | Insulation laminated paper board and preparation thereof |
| US20150371730A1 (en) * | 2014-06-20 | 2015-12-24 | Hitachi, Ltd. | Electrical Insulating Paper and Stationary Induction Electrical Apparatus Using the Same |
| CN106223104A (en) * | 2016-07-27 | 2016-12-14 | 陕西科技大学 | A kind of method using PSA fiber to prepare aramid fiber extrusion coating paper |
| CN107867035A (en) * | 2017-10-25 | 2018-04-03 | 苏州巨峰电气绝缘系统股份有限公司 | A kind of H of resistance to gear box oil levels slot insulation material and its application |
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| CN111058337B (en) | 2022-03-15 |
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