CN102723152A - Modifying method for improving puncture strength of cellulose insulation paper and insulation paper - Google Patents
Modifying method for improving puncture strength of cellulose insulation paper and insulation paper Download PDFInfo
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- CN102723152A CN102723152A CN2012102345375A CN201210234537A CN102723152A CN 102723152 A CN102723152 A CN 102723152A CN 2012102345375 A CN2012102345375 A CN 2012102345375A CN 201210234537 A CN201210234537 A CN 201210234537A CN 102723152 A CN102723152 A CN 102723152A
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Abstract
The invention discloses a modifying method for improving the puncture strength of cellulose insulation paper and insulation paper. The modifying method comprises the steps of adding 6-10% MMT ethanol mixed solution based on the weight of insulation paper pulp, and stirring and dissolving in a cellulose dissociator for 3-30mins. The method for preparing the MMT ethanol mixed solution comprises the steps of dissolving montmorillonoid in absolute ethyl alcohol according to the mass proportion of 1:100, and stirring in a magnetic stirrer for 10min. The power frequency puncture voltage of the novel insulation paper prepared by the method is 53.5kv/mm-56.9kv/mm, increased by 6.4-13.1% compared to the puncture voltage of plain paper of 50.3kv, and the power frequency relative dielectric constant is 2.29-2.42, decreased by 4.3-9.5% compared to the dielectric constant of plain paper of 2.53.
Description
Technical field
What the present invention relates to is a kind of method of modifying and insulating paper that improves cellulose insulation paper breakdown strength.
Background technology
Transformer is the nucleus equipment in the electric power system; The paper oil insulation system plays main insulating effect in transformer; The factor affecting such as electricity, heat that in the long-time running process, receive insulating paper and transformer oil take place aging; Cause transformer insulated decreased performance, can cause transformer main insulation or longitudinal insulation fault.The paper oil insulation ageing process is irreversible, and its performance quality is the useful life of decision transformer directly.The oil-paper that transformer uses is commonly called as brown paper; Main component is a native cellulose; Just extensively be used in the oil-immersed type power equipment nineties in last century; Brown paper is because its cheap price good mechanical strength and electrical strength when initial makes that brown paper is first-selected insulating material in most oil-filled transformers all the time.
Yet the native cellulose polymer is prone to take place thermal degradation, oxidative degradation and hydrolysis in the transformer running, generate small-molecule substance, thereby the degree of polymerization reduces to make mechanical strength to reduce, and influences the security of operation of transformer.Through the native cellulose insulating paper is carried out modification, thus the puncture voltage that improves insulating paper with reduce its relative dielectric constant and delay it and agingly just become an important problem.The method to the modification of native cellulose insulating paper of comparative maturity has two kinds at present, and one of them carries out chemical modification to paper pulp exactly, makes the more stable group replacement of suction group hydroxyl quilt in the insulating paper main component cellulose, like cyanogen secondization, acetylation.Intensity and the hydrogen bond between the cellulose chain that the mechanical strength of insulating paper mainly comes from cellulose chain self connect.After the hydrophilic radical hydroxyl in the cellulose was substituted, the hydroxyl on the cellulose chain tailed off, and the connection between the cellulose chain will be destroyed, machinery intensity decreases when causing into paper, and this is cyanogen secondization, the maximum shortcoming of acetylation insulating paper.Second method is in insulating paper, to add heat stabilizer, and heat stabilizer and moisture, acid etc. influence the aging composition reaction of insulating paper, thereby the protection insulating paper slows down its degraded.It mainly is aminated compounds that institute adds heat stabilizer, and dicyandiamide is exactly one of heat stabilizer commonly used.Because stabilizer that insulating paper adds influences in the cellulose the key hydroxyl, compare with the insulating paper of the chemical modification variation of initial mechanical intensity of the insulating paper behind the interpolation stabilizer is negligible.What the transformer overwhelming majority who therefore, is moving now adopted is the insulating paper that carries out modification with second method.
Summary of the invention
The objective of the invention is to provides a kind of method of modifying and insulating paper that improves cellulose insulation paper breakdown strength to the deficiency of prior art.
The present invention adopts following technical scheme:
A kind of method of modifying that improves cellulose insulation paper breakdown strength is a benchmark with insulation paper pulp weight, adds the MMT alcohol mixed solution of 6%-10%, in fiber dissociates device, stirs, dissociates, and mixing time is 3-30mins; Described MMT alcohol mixed solution preparation method is: the mass ratio of imvite with 1:100 is dissolved in the absolute ethyl alcohol, on magnetic stirring apparatus, stirs 10min, get the MMT alcohol mixed solution.
Frequency breakdown voltage according to the novel insulating paper of method for preparing is: 53.5kv/mm～56.9kv/mm, improved 6.4%～13.1% (the plain pape puncture voltage is 50.3kv); The power frequency relative dielectric constant is: 2.29～2.42, reduced by 4.3%～9.5% (dielectric constant of plain pape is 2.53).
Embodiment
Below in conjunction with specific embodiment, the present invention is elaborated.
The method of modifying of raising cellulose insulation paper breakdown strength of the present invention may further comprise the steps:
(1) making beating
Slurry need be pulled an oar before manufacturing paper with pulp into paper, through the mechanical treatment of beater, makes fiber stand the effect of mechanical force and produces variations such as cut-out, conquassation, swollen and fibrillating, and this test beating degree generally is controlled at about 40 ° of SR, and paper pulp must insulate.
(2) preparation imvite (MMT)
The mass ratio of imvite (MMT) with 1: 100 is dissolved in the absolute ethyl alcohol, on magnetic stirring apparatus, stirs 10min, get the MMT alcohol mixed solution.
(3) dissociate and add the MMT alcohol mixed solution
With insulation paper pulp weight is benchmark, adds the MMT alcohol mixed solution of 6%-10%, in fiber dissociates device, dissociates with the stir speed (S.S.) of 3000rpm, and mixing time is 3-30mins.
(4) manufacture paper with pulp
Obtaining 120g/m through filtered water (film-making moulding), after taking off the oven dry of paper and the scraps of paper
2Novel insulating paper (handsheet).
(5) handsheet immersion oil
Handsheet is cut into the disk of diameter 4cm, puts into the different glass bottle.Put into dry 48 hours of the vacuum chamber of 90oC afterwards, again the vacuum chamber temperature is dropped to 40oC, and in bottle, add insulating oil, under the vacuum environment dry 24 hours, obtain impregnated insulation paper and be used to test puncture voltage.
Embodiment 1
The MMT alcohol mixed solution that adds in the insulation paper pulp is 6%, and the MMT alcohol mixed solution is 3min with the mixing time of insulation paper pulp.
Embodiment 2
The MMT alcohol mixed solution that adds in the insulation paper pulp is 9%, and the MMT alcohol mixed solution is 3min with the mixing time of insulation paper pulp.
Embodiment 3
The MMT alcohol mixed solution that adds in the insulation paper pulp is 9%, and the MMT alcohol mixed solution is 5min with the mixing time of insulation paper pulp.
Embodiment 4
The MMT alcohol mixed solution that adds in the insulation paper pulp is 9%, and the MMT alcohol mixed solution is 8min with the mixing time of insulation paper pulp.
Embodiment 5
The MMT alcohol mixed solution that adds in the insulation paper pulp is 9%, and the MMT alcohol mixed solution is 12min with the mixing time of insulation paper pulp.
Embodiment 6
The MMT alcohol mixed solution that adds in the insulation paper pulp is 9%, and the MMT alcohol mixed solution is 30min with the mixing time of insulation paper pulp.
The novel insulating paper leading indicator of the present invention's preparation is following:
| Parameter | Blank | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 |
| Puncture voltage | 50.3 | 55.8 | 56.86 | 58.6 | 59.5 | 59.8 | 60 |
| The power frequency relative dielectric constant | 2.53 | 2.42 | 2.28 | 2.29 | 2.30 | 2.31 | 2.31 |
Should be understood that, concerning those of ordinary skills, can improve or conversion, and all these improvement and conversion all should belong to the protection range of accompanying claims of the present invention according to above-mentioned explanation.
Claims (2)
1. a method of modifying that improves cellulose insulation paper breakdown strength is characterized in that, is benchmark with insulation paper pulp weight, adds the MMT alcohol mixed solution of 6%-10%, in fiber dissociates device, stirs, dissociates, and mixing time is 3-30mins; Described MMT alcohol mixed solution preparation method is: the mass ratio of imvite with 1: 100 is dissolved in the absolute ethyl alcohol, on magnetic stirring apparatus, stirs 10min, get the MMT alcohol mixed solution.
2. the insulating paper of method of modifying preparation according to claim 1 is characterized in that frequency breakdown voltage is: 53.5kv/mm～56.9kv/mm; The power frequency relative dielectric constant is: 2.29～2.42.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012102345375A CN102723152A (en) | 2012-07-09 | 2012-07-09 | Modifying method for improving puncture strength of cellulose insulation paper and insulation paper |
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| CN2012102345375A CN102723152A (en) | 2012-07-09 | 2012-07-09 | Modifying method for improving puncture strength of cellulose insulation paper and insulation paper |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266535A (en) * | 2013-05-27 | 2013-08-28 | 长沙理工大学 | Preparation method of anti-aging agent for transformer insulation paper |
| WO2016112523A1 (en) * | 2015-01-16 | 2016-07-21 | 阿尔斯通技术有限公司 | Nanometer aluminium oxide modified insulation paper and preparation method thereof |
| CN111243683A (en) * | 2020-01-13 | 2020-06-05 | 重庆大学 | Method for guiding cellulose molecule design and dielectric property evaluation |
| CN112265349A (en) * | 2020-10-13 | 2021-01-26 | 江苏亚振电力有限公司 | Shielding insulation paper for extra-high voltage transformer |
| CN116283362A (en) * | 2023-02-09 | 2023-06-23 | 萍乡市锦宏瓷业有限公司 | Hydrophobic porcelain insulator and preparation method thereof |
Citations (3)
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| SU937591A1 (en) * | 1980-05-19 | 1982-06-23 | за витель Н.П.Маркова | Method of making electrically insulating paper |
| CN101369481A (en) * | 2008-06-24 | 2009-02-18 | 保定天威集团有限公司 | Application of TIII sheet paper in oil-immersed type transformer as low-dielectric constant insulation material |
| CN101949082A (en) * | 2010-08-31 | 2011-01-19 | 天津工业大学 | Method for preparing polyphenylene sulfide fiber insulation paper |
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2012
- 2012-07-09 CN CN2012102345375A patent/CN102723152A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU937591A1 (en) * | 1980-05-19 | 1982-06-23 | за витель Н.П.Маркова | Method of making electrically insulating paper |
| CN101369481A (en) * | 2008-06-24 | 2009-02-18 | 保定天威集团有限公司 | Application of TIII sheet paper in oil-immersed type transformer as low-dielectric constant insulation material |
| CN101949082A (en) * | 2010-08-31 | 2011-01-19 | 天津工业大学 | Method for preparing polyphenylene sulfide fiber insulation paper |
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| 张福州 等: "低介电常数绝缘纸的制备及其击穿性能", 《高电压技术》 * |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266535A (en) * | 2013-05-27 | 2013-08-28 | 长沙理工大学 | Preparation method of anti-aging agent for transformer insulation paper |
| WO2016112523A1 (en) * | 2015-01-16 | 2016-07-21 | 阿尔斯通技术有限公司 | Nanometer aluminium oxide modified insulation paper and preparation method thereof |
| CN111243683A (en) * | 2020-01-13 | 2020-06-05 | 重庆大学 | Method for guiding cellulose molecule design and dielectric property evaluation |
| CN111243683B (en) * | 2020-01-13 | 2023-04-07 | 重庆大学 | Method for guiding cellulose molecule design and dielectric property evaluation |
| CN112265349A (en) * | 2020-10-13 | 2021-01-26 | 江苏亚振电力有限公司 | Shielding insulation paper for extra-high voltage transformer |
| CN116283362A (en) * | 2023-02-09 | 2023-06-23 | 萍乡市锦宏瓷业有限公司 | Hydrophobic porcelain insulator and preparation method thereof |
| CN116283362B (en) * | 2023-02-09 | 2024-02-23 | 萍乡市锦宏瓷业有限公司 | Hydrophobic porcelain insulator and preparation method thereof |
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Application publication date: 20121010 |