CN102831991B - Method for manufacturing epoxy-cast insulators - Google Patents
Method for manufacturing epoxy-cast insulators Download PDFInfo
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- CN102831991B CN102831991B CN201210282001.0A CN201210282001A CN102831991B CN 102831991 B CN102831991 B CN 102831991B CN 201210282001 A CN201210282001 A CN 201210282001A CN 102831991 B CN102831991 B CN 102831991B
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- 239000012212 insulator Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 66
- 229910052751 metal Inorganic materials 0.000 claims abstract description 42
- 239000002184 metal Substances 0.000 claims abstract description 42
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000005266 casting Methods 0.000 claims abstract description 27
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 23
- 238000004381 surface treatment Methods 0.000 claims abstract description 19
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 239000004593 Epoxy Substances 0.000 claims description 26
- 239000011259 mixed solution Substances 0.000 claims description 21
- 238000013021 overheating Methods 0.000 claims description 21
- 238000009413 insulation Methods 0.000 claims description 18
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 14
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 claims description 14
- 238000005554 pickling Methods 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 10
- 235000021110 pickles Nutrition 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 5
- 229920005989 resin Polymers 0.000 abstract description 12
- 239000011347 resin Substances 0.000 abstract description 12
- 238000007711 solidification Methods 0.000 abstract description 10
- 230000008023 solidification Effects 0.000 abstract description 10
- 238000004140 cleaning Methods 0.000 abstract description 9
- 239000011159 matrix material Substances 0.000 abstract description 5
- 239000002253 acid Substances 0.000 abstract description 2
- 238000005406 washing Methods 0.000 abstract 7
- 238000000465 moulding Methods 0.000 abstract 2
- 230000003628 erosive effect Effects 0.000 abstract 1
- 238000005488 sandblasting Methods 0.000 abstract 1
- 238000002791 soaking Methods 0.000 abstract 1
- 238000001723 curing Methods 0.000 description 40
- 239000004020 conductor Substances 0.000 description 11
- 230000015556 catabolic process Effects 0.000 description 7
- 239000010410 layer Substances 0.000 description 5
- 238000001938 differential scanning calorimetry curve Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 230000009477 glass transition Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 239000002585 base Substances 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 238000010125 resin casting Methods 0.000 description 2
- 238000004506 ultrasonic cleaning Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000005382 thermal cycling Methods 0.000 description 1
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- Insulators (AREA)
- Insulating Bodies (AREA)
Abstract
The invention relates to a method for manufacturing epoxy-cast insulators. The method includes steps of surface treatment for metal inserts, preparation of castable, moulding of the metal inserts, casting, solidification and demoulding. The step of surface treatment for the metal insert includes sand blasting for the inserts, cleaning of the inserts and gluing of the inserts. The cleaning of the inserts sequentially includes steps of (1), eroding the metal inserts in sodium hydroxide liquor at the temperature of 90+/-5 DEG C for 5 to 20 seconds; (2), washing the metal inserts by hot water at the temperature of 90+/-5 DEG C for 3 to 15 seconds; (3), washing the metal inserts by cold water at the temperature of 25+/-5 DEG C for 3 to 15 seconds; (4), washing the metal inserts by nitric acid at the temperature of 25+/-5 DEG C for 5 to 20 seconds; (5), washing the metal inserts by cold water at the temperature of 25+/-5 DEG C for 3 to 15 seconds; (6), washing the metal inserts by mixed acid of sulfuric acid at the temperature of 25+/-5 DEG C for 5 to 15 minutes; (7), washing the metal inserts by cold water at the temperature of 25+/-5 DEG C for 3 to 15 seconds; (8), washing the metal inserts by hot water at the temperature of 90+/-5 DEG C for 3 to 15 seconds; and (9), soaking the metal inserts in cold water and taking out the metal inserts before moulding for the inserts. The method has the advantages that binding force between the metal insert and a resin matrix is increased by about 50% as compared with the conventional surface treatment process, and bonding strength of the metal inserts and the resin matrix can reach 55MPa.
Description
Technical field
The present invention relates to a kind of epoxy casting insulator manufacture method.
Background technology
For high voltage switchgear, the height of its electric pressure depends primarily on every electricity function index and the mechanical performance index of insulator, electric pressure is higher, just harsher to the requirement of insulator, and insulator mechanical performance index adopts hydraulic pressure breakdown strength to weigh at present.For large-scale insulator, as 1100kV disc insulator (diameter 934mm for GIS, degree of depth 365mm, weight 140kg), requirement must have good mechanical performance meeting under the prerequisite of its electric property, it is the designing requirement that hydraulic pressure breakdown strength must reach regulation, and the height of hydraulic pressure breakdown strength is determined by intensity and the toughness of insulator body, under the certain condition of insulator design size, the curing in its epoxy casting production is key one ring that determines insulator body intensity and toughness.
At present, the conventional manufacture method of epoxy casting insulator mainly comprises following technical process: mould is prepared, the insert surface such as center conductor are processed, preparation castable, inserts dress mould, cast, solidify and the demoulding, wherein solidification process is the key link that affects pouring piece mechanical performance index height, solidification process has persistently overheating generally, insulation and three Main Stage of cooling, the microstructure that the height of curing temperature and the length of curing time directly affect pouring piece forms and contraction situation, curing temperature too high or persistently overheating comparatively fast all can cause pore even shrinkage cavity produce, thereby affect the mechanical performance of pouring piece.
Currently used epoxy resin casting workpiece curing mainly contains two kinds: single hop solidifies with two sections and solidifies, its corresponding curing degree DSC curve as shown in Figure 1, single hop solidifies with two sections and solidifies the top and curve bottom in difference corresponding diagram, from curve shown in figure, single hop solidifies the general relatively low curing temperature of selecting, by adding, improve for a long time curing degree, therefore, adopt the curing insulator curing degree of single hop generally on the low side, in its solidification process, glass transition temperature is low, and has obvious curing exothermic peak; Two sections solidify due to the first stage and second stage temperature spread excessive, in second stage, very easily cause the too high situation of curing degree, in its solidification process, glass transition temperature is high, and flex point is not obvious.The insulator that adopts above-mentioned two kinds of curings cast, when its curing degree is too low, insulator body is partially soft, pliable and tough, but its intensity is less than normal; Although and too high curing degree insulator strength is large, fragility is also large simultaneously, increased the risk of cracking.
In Fig. 1, single hop solidifies with two sections of curing DSC curves known, the intensity of insulator has direct associated with toughness and epoxy casting curing degree, for requiring the large-scale insulator of higher hydraulic pressure breakdown strength, its pouring technology must guarantee that insulator has higher intensity and good toughness, adopt above-mentioned two kinds of epoxy resin casting workpiece curings to produce large-scale insulator and obviously can not reach its requirement to mechanical performance, that is to say that its solidification process need to adopt a brand-new curing, this epoxy casting technique to insulator has proposed a new problem.
In addition, the adhesion of disc insulator center conductor metal insert and resin matrix presses breakdown strength also to have a certain impact to insulator water, so in disc insulator cast production process, before cast, must carry out surface treatment to metal inserts such as center conductors, to improve the adhesion of metal insert and resin matrix, the surface treatment method of currently used routine is that metal insert is carried out to sandblast and Ultrasonic Cleaning, this processing method is simple, can not meet its requirement to inserts and interlaminar resin adhesion for large-scale disc insulator.
Summary of the invention
The object of this invention is to provide a kind of epoxy casting insulator manufacture method that can improve adhesion between the metal inserts such as center conductor and epoxy resin-base.
For achieving the above object, the present invention adopts following technical scheme: epoxy casting insulator manufacture method, comprise the steps: metal insert surface treatment, preparation castable, metal insert dress mould, cast, solidify and the demoulding, wherein, metal insert surface treatment step comprises that inserts sandblast, inserts clean and inserts gluing, and wherein inserts cleans step in the following order and carries out:
(1) 90 ± 5 ℃ of sodium hydroxide solution corrodes 5～20s;
(2) 90 ± 5 ℃ of hot water wash 3～15s;
(3) 25 ± 5 ℃ of cold wash 3～15s;
(4) 25 ± 5 ℃ of nitric acid are washed 5～20s;
(5) 25 ± 5 ℃ of cold wash 3～15s;
(6) 25 ± 5 ℃ of sulfuric acid based are mixed pickling 5～15min;
(7) 25 ± 5 ℃ of cold wash 3～15s;
(8) 90 ± 5 ℃ of hot water wash 3～15s;
(9) cold water soak is taken out to inserts dress mould.
Further, in described step (6), the mixed solution of the mixed solution of mixed solution, sulfuric acid and chromic acid that the pickle that sulfuric acid based mixing pickling is used is sulfuric acid and nitric acid or sulfuric acid and nitric acid, chromic acid.
Further, after the demoulding, also have destressing step, destressing step is that the insulator after the demoulding is kept to 4 ± 0.5h at 145 ± 3 ℃ of temperature.
Curing in the present invention is divided into three phases by solidification process and carries out (below curing of the present invention being solidified referred to as three sections), its curing degree can carry out qualitative evaluation by DSC curve as shown in Figure 1, in Fig. 1, three sections solidify corresponding curve in the middle of being, from Fig. 1, the contrast of three curves can clearly illustrate, the present invention is by the reasonable control to Temperature Distribution in solidification process and duration, make in solidification process persistently overheating mild, and the duration is suitable, in solidification process, glass transition temperature is moderate, flex point is obvious, and without exothermic peak, three sections of curing casting process that make have and two section curing preferably curing degrees more curing than single hop, following table is to adopting intensity that three kinds of samples that curing is poured into a mould carry out and the data of toughness test:
By the comparison of the test data in above table and Fig. 2, Fig. 3 Electronic Speculum figure, the coarse grains that single hop is curing and inhomogeneous, easily surrender causes intensity little, and elongation at break is large; Two sections of curing materials are partially crisp, and easily embrittlement causes intensity little, and elongation at break is little; Use three sections of curing disc insulators for using the curing disc insulator of single hop, uniform crystal particles and tiny, tight type and the uniformity of insulator tissue have significantly been promoted, further make insulator bulk strength obtain obvious lifting, with respect to single hop, solidify with two sections and solidify, adopt three sections of pouring pieces that solidify acquisition when having higher intensity, also to have higher toughness, comprehensive mechanical performance is good.Three sections of curings make to produce the large-scale disc insulator that meets instructions for use becomes possibility, the specification that adopts method manufacture of the present invention is the disc insulator of diameter 934mm, degree of depth 365mm, weight 140kg, after 10 thermal cycling tests of experience, hydraulic pressure breakdown strength is up to 4.4MPa, in addition, the unit thickness breakdown strength of insulator can reach 35kV/mm, has guaranteed the electrical property of insulator.
The present invention, the three sections of curing initial employing of first stage insulation 0.05MPa pressurization measures, can reduce the defects such as shrinking pattern that pouring piece causes because of cure shrinkage, and this has the meaning of outbalance for large-scale pouring piece.
In the present invention, the process of surface treatment that adopts sandblast, cleaning to combine with gluing for metal inserts such as insulator center conductors, cleaning step repeatedly due to cleaning process employing different solutions, not only can remove the insert surface layer materials such as center conductor, can also make through the insert surface fluctuating homogeneous of blasting treatment and closely knit simultaneously, thereby promote the adhesion between center conductor and resin matrix; Use commercial blast to add the mode of Ultrasonic Cleaning, the bond strength of resin and metal is only 25MPa left and right, and the bond strength of metal insert of the present invention and interlaminar resin can reach 55MPa left and right, its adhesion compare conventional process of surface treatment promoted about 50%, for the lifting of disc insulator hydraulic pressure destructive characteristics is laid a good foundation.
In the present invention, after the demoulding, adopt 145 ± 3 ℃/4h destressing to process, fully discharged the Solidifying stress of disc insulator, and the time is appropriate, can not cause that fragility changes.
Accompanying drawing explanation
Fig. 1 be single hop solidify, two sections solidify and the DSC curve comparison of three sections of curing insulator curing degrees of the present invention;
Fig. 2 is the 4000 times of Electronic Speculum figure of disc insulator microstructure that form by single hop curing after epoxy casting;
Fig. 3 is the 4000 times of Electronic Speculum figure of disc insulator microstructure that form according to three sections of curings of the present invention after epoxy casting;
Fig. 4 is three sections of curing temperature-time plots in the present invention;
Fig. 5 is the flow chart of epoxy casting insulator manufacture method embodiment 1 of the present invention.
Embodiment
The embodiment of epoxy casting insulator manufacture method provided by the invention is as follows
Embodiment 1: as shown in Figure 5, epoxy casting insulator manufacture method comprises the steps:
1, mould is prepared: mainly the metal insert surface treatments such as die treatment, center conductor, inserts dress mould and mould preliminary drying, consist of;
2, preparation castable: after completing, resin preliminary drying, curing agent preliminary drying and filler preliminary drying prepare burden, and then static batch mixing; This step is identical with corresponding conventional steps;
3, vacuum pouring: identical with normal pouring mode;
4, solidify: curing schedule is three sections and solidifies, three sections of three phases that solidify by following order form, as shown in Figure 4, the first stage: persistently overheating to 105 ℃ by normal temperature in 2h, and be incubated 15h, the front 6h in this insulation 15h adopts 0.05MPa pressure heat-preserving; Then enter second stage: persistently overheating to 150 ℃ by 105 ℃ in 1h, and be incubated 15h; Then enter the phase III: persistently overheating to 155 ℃ by 150 ℃ in 1h, and be incubated 5h;
5, the demoulding;
6, destressing is processed: destressing step is that the insulator after the demoulding is kept to 4h at 145 ℃ of temperature.
Wherein, the metal insert surface treatments such as the center conductor in step 1 by inserts sandblast, inserts, are cleaned successively and inserts gluing forms, wherein inserts cleaning step in the following order step carry out:
(1) 90 ℃ of sodium hydroxide solution corrodes 12s; Owing to having formed the irregular loose structure of convex-concave on the metal insert surface after blasting treatment, and there is oxide layer in insert surface, after sandblast, with sodium hydroxide solution, this oxide layer is eaten away, the alkali lye of heat can expand the micropore in insert surface, has guaranteed that the oxide layer outside the endoporus of insert surface hole can be etched thoroughly;
(2) 90 ℃ of hot water wash 9s; Adopt with the hot water of alkali lye uniform temp and can make the micropore of insert surface keep the not shrinkage cavity of original reaming state, residual alkali lye and the impurity of being convenient to hole endoporus outer surface to adhere to wash away;
(3) 25 ℃ of cold wash 9s; Further clean the residue of insert surface, improve surface cleanliness;
(4) 25 ℃ of nitric acid are washed 12s; This step adopts nitric acid to carry out acid-base neutralization, removes the alkaline etching layer of insert surface;
(5) 25 ℃ of cold wash 9s; This step washes away raffinate and the impurity that insert surface is adhered to;
(6) 25 ℃ of sulfuric acid based are mixed pickling 9min; Pickle can adopt the mixed solution of the mixed solution of mixed solution, sulfuric acid and chromic acid of sulfuric acid and nitric acid or sulfuric acid and nitric acid, chromic acid; This step is in order to eliminate burr spike of insert surface etc., to make insert surface convex-concave uniformity, to improve the adhesion with resin;
(7) 25 ℃ of cold wash 9s; Remove residual acid solution and impurity that insert surface is adhered to;
(8) 90 ℃ of hot water wash 9s; Adopt hot water again under reaming state, to clean, thoroughly the residue of cleaning hole endoporus outer surface;
(9) cold water soak is taken out to inserts dress mould.If the insert surface after above-mentioned steps is processed contacts certain hour with air very easily oxidized, the oxide layer producing can reduce the adhesion with resin, so in inserts being soaked in to cold water before cast dress mould with air-isolation, prevent oxidized, until inserts is taken out from water when to be cast to dress mould.
Embodiment 2: the epoxy casting insulator manufacture method of the present embodiment and the difference of embodiment 1 are: in step 1 cleaning step of metal insert in the following order step carry out:
(1) 95 ℃ of sodium hydroxide solution corrodes 5s;
(2) 95 ℃ of hot water wash 3s;
(3) 30 ℃ of cold wash 3s;
(4) 30 ℃ of nitric acid are washed 5s;
(5) 30 ℃ of cold wash 3s;
(6) 30 ℃ of sulfuric acid based are mixed pickling 5min; Pickle can adopt the mixed solution of the mixed solution of mixed solution, sulfuric acid and chromic acid of sulfuric acid and nitric acid or sulfuric acid and nitric acid, chromic acid;
(7) 30 ℃ of cold wash 3s;
(8) 95 ℃ of hot water wash 3s;
(9) cold water soak is taken out to inserts dress mould.
In addition, in step 4, the three phases solidifying by following order forms, the first stage: persistently overheating to 102 ℃ by normal temperature in 1.5h, and be incubated 15.5h, the front 6h in this insulation 15.5h is 0.05MPa pressure heat-preserving; Then enter second stage: persistently overheating to 147 ℃ by 102 ℃ in 0.5h, and be incubated 15.5h; Then enter the phase III: persistently overheating to 152 ℃ by 147 ℃ in 0.5h, and be incubated 5.5h.
In step 6, destressing step is that the pouring piece after the demoulding is kept to 4.5h at 142 ℃ of temperature.
Embodiment 3: the epoxy casting insulator manufacture method of the present embodiment and the difference of embodiment 1 are: in step 1 cleaning step of metal insert in the following order step carry out:
(1) 85 ℃ of sodium hydroxide solution corrodes 20s;
(2) 85 ℃ of hot water wash 15s;
(3) 20 ℃ of cold wash 15s;
(4) 20 ℃ of nitric acid are washed 20s;
(5) 20 ℃ of cold wash 15s;
(6) 20 ℃ of sulfuric acid based are mixed pickling 15min; Pickle can adopt the mixed solution of the mixed solution of mixed solution, sulfuric acid and chromic acid of sulfuric acid and nitric acid or sulfuric acid and nitric acid, chromic acid;
(7) 20 ℃ of cold wash 15s;
(8) 85 ℃ of hot water wash 15s;
(9) cold water soak is taken out to inserts dress mould.
In addition, in step 4, the three phases solidifying by following order forms, the first stage: persistently overheating to 108 ℃ by normal temperature in 2.5h, and be incubated 14.5h, the front 6h in this insulation 14.5h is 0.05MPa pressure heat-preserving; Then enter second stage: persistently overheating to 153 ℃ by 108 ℃ in 1.5h, and be incubated 14.5h; Then enter the phase III: persistently overheating to 158 ℃ by 153 ℃ in 1.5h, and be incubated 4.5h.
In step 6, destressing step is that the pouring piece after the demoulding is kept to 3.5h at 148 ℃ of temperature.
Step 4 in above-mentioned three embodiment, three sections solidify front 6h in middle first stage insulating process and adopt the measure of 0.05MPa pressure heat-preserving, all the defects such as shrinking pattern that cause because of cure shrinkage in order to reduce insulator, pressurization feeding has the meaning of outbalance for large-scale insulator, for pony insulator, can depress insulation will not add.
Epoxy casting insulator manufacture method of the present invention, the metal insert surface treatment methods such as center conductor are wherein specially adapted to the production of large-scale disc insulator, the disc insulator that adopts the inventive method to produce, the bond strength of its center conductor metal inserts and interlaminar resin can reach 55MPa left and right, its adhesion compare conventional process of surface treatment promoted about 50%, for the lifting of disc insulator hydraulic pressure destructive characteristics is laid a good foundation.
Claims (9)
1. epoxy casting insulator manufacture method, is characterized in that: comprises the steps: metal insert surface treatment, preparation castable, metal insert dress mould, cast, solidifies and the demoulding, wherein:
Curing schedule has three phases: the first stage, persistently overheating to 105 ℃ of insulation 15h by normal temperature in 2h, the front 6h in this insulation 15h is 0.05MPa pressure heat-preserving; Second stage, persistently overheating to 150 ℃ of insulation 15h by 105 ℃ in 1h; Phase III, persistently overheating to 155 ℃ of insulation 5h by 150 ℃ in 1h;
Metal insert surface treatment step comprises that inserts sandblast, inserts clean and inserts gluing, and wherein inserts cleans step in the following order and carries out:
(1) 90 ± 5 ℃ of sodium hydroxide solution corrodes 5～20s;
(2) 90 ± 5 ℃ of hot water wash 3～15s;
(3) 25 ± 5 ℃ of cold wash 3～15s;
(4) 25 ± 5 ℃ of nitric acid are washed 5～20s;
(5) 25 ± 5 ℃ of cold wash 3～15s;
(6) 25 ± 5 ℃ of sulfuric acid based are mixed pickling 5～15min;
(7) 25 ± 5 ℃ of cold wash 3～15s;
(8) 90 ± 5 ℃ of hot water wash 3～15s;
(9) cold water soak is taken out to inserts dress mould.
2. epoxy casting insulator manufacture method according to claim 1, it is characterized in that: in described step (6), the mixed solution of the mixed solution of mixed solution, sulfuric acid and chromic acid that the pickle that sulfuric acid based mixing pickling is used is sulfuric acid and nitric acid or sulfuric acid and nitric acid, chromic acid.
3. epoxy casting insulator manufacture method according to claim 1 and 2, is characterized in that: after the demoulding, also have destressing step, destressing step is that the insulator after the demoulding is kept to 4 ± 0.5h at 145 ± 3 ℃ of temperature.
4. epoxy casting insulator manufacture method, is characterized in that: comprises the steps: metal insert surface treatment, preparation castable, metal insert dress mould, cast, solidifies and the demoulding, wherein:
Curing schedule has three phases: the first stage, persistently overheating to 102 ℃ of insulation 15.5h by normal temperature in 1.5h, the front 6h in this insulation 15.5h is 0.05MPa pressure heat-preserving; Second stage, persistently overheating to 147 ℃ of insulation 15.5h by 102 ℃ in 0.5h; Phase III, persistently overheating to 152 ℃ of insulation 5.5h by 147 ℃ in 0.5h;
Metal insert surface treatment step comprises that inserts sandblast, inserts clean and inserts gluing, and wherein inserts cleans step in the following order and carries out:
(1) 90 ± 5 ℃ of sodium hydroxide solution corrodes 5～20s;
(2) 90 ± 5 ℃ of hot water wash 3～15s;
(3) 25 ± 5 ℃ of cold wash 3～15s;
(4) 25 ± 5 ℃ of nitric acid are washed 5～20s;
(5) 25 ± 5 ℃ of cold wash 3～15s;
(6) 25 ± 5 ℃ of sulfuric acid based are mixed pickling 5～15min;
(7) 25 ± 5 ℃ of cold wash 3～15s;
(8) 90 ± 5 ℃ of hot water wash 3～15s;
(9) cold water soak is taken out to inserts dress mould.
5. epoxy casting insulator manufacture method according to claim 4, it is characterized in that: in described step (6), the mixed solution of the mixed solution of mixed solution, sulfuric acid and chromic acid that the pickle that sulfuric acid based mixing pickling is used is sulfuric acid and nitric acid or sulfuric acid and nitric acid, chromic acid.
6. according to the epoxy casting insulator manufacture method described in claim 4 or 5, it is characterized in that: after the demoulding, also have destressing step, destressing step is that the insulator after the demoulding is kept to 4 ± 0.5h at 145 ± 3 ℃ of temperature.
7. epoxy casting insulator manufacture method, is characterized in that: comprises the steps: metal insert surface treatment, preparation castable, metal insert dress mould, cast, solidifies and the demoulding, wherein:
Curing schedule has three phases: the first stage, persistently overheating to 108 ℃ of insulation 14.5h by normal temperature in 2.5h, the front 6h in this insulation 14.5h is 0.05MPa pressure heat-preserving; Second stage, persistently overheating to 153 ℃ of insulation 14.5h by 108 ℃ in 1.5h; Phase III, persistently overheating to 158 ℃ of insulation 4.5h by 153 ℃ in 1.5h;
Metal insert surface treatment step comprises that inserts sandblast, inserts clean and inserts gluing, and wherein inserts cleans step in the following order and carries out:
(1) 90 ± 5 ℃ of sodium hydroxide solution corrodes 5～20s;
(2) 90 ± 5 ℃ of hot water wash 3～15s;
(3) 25 ± 5 ℃ of cold wash 3～15s;
(4) 25 ± 5 ℃ of nitric acid are washed 5～20s;
(5) 25 ± 5 ℃ of cold wash 3～15s;
(6) 25 ± 5 ℃ of sulfuric acid based are mixed pickling 5～15min;
(7) 25 ± 5 ℃ of cold wash 3～15s;
(8) 90 ± 5 ℃ of hot water wash 3～15s;
(9) cold water soak is taken out to inserts dress mould.
8. epoxy casting insulator manufacture method according to claim 7, it is characterized in that: in described step (6), the mixed solution of the mixed solution of mixed solution, sulfuric acid and chromic acid that the pickle that sulfuric acid based mixing pickling is used is sulfuric acid and nitric acid or sulfuric acid and nitric acid, chromic acid.
9. according to the epoxy casting insulator manufacture method described in claim 7 or 8, it is characterized in that: after the demoulding, also have destressing step, destressing step is that the insulator after the demoulding is kept to 4 ± 0.5h at 145 ± 3 ℃ of temperature.
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| CN1284190C (en) * | 2004-10-22 | 2006-11-08 | 西安交通大学 | vacuum insulator coating capable of increasing flashover voltage and method of preparation thereof |
| CN101252034B (en) * | 2008-04-03 | 2010-11-24 | 醴陵泓嘉机械实业有限公司 | Column support type hollow combined insulator and production process thereof |
| CN101540225B (en) * | 2009-03-24 | 2011-02-09 | 西安交通大学 | Method for preparing silicon rubber insulator super-hydrophobicity surface |
| CN101859616B (en) * | 2009-04-09 | 2013-12-18 | 何愈 | Method for improving mechanical strength of insulation resin products |
| CN102074323A (en) * | 2009-11-23 | 2011-05-25 | 常熟风范电力设备股份有限公司 | Novel insulating cross arm and manufacturing process thereof |
| CN101840757A (en) * | 2010-05-21 | 2010-09-22 | 扬州东宇电气有限公司 | Manufacturing method for environment-friendly type insulator shell |
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2012
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