CN106811023A - A kind of environment-friendly type wind-driven generator VPI impregnating resins and preparation method thereof - Google Patents
A kind of environment-friendly type wind-driven generator VPI impregnating resins and preparation method thereof Download PDFInfo
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- CN106811023A CN106811023A CN201611113467.2A CN201611113467A CN106811023A CN 106811023 A CN106811023 A CN 106811023A CN 201611113467 A CN201611113467 A CN 201611113467A CN 106811023 A CN106811023 A CN 106811023A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
- C09D167/06—Unsaturated polyesters having carbon-to-carbon unsaturation
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- 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
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/307—Other macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
Abstract
The invention discloses a kind of environment-friendly type wind-driven generator VPI impregnating resins, by mass percentage, component includes：Heat-resisting bicyclic unsaturated polyester resin system, modified epoxy, crosslinking agent, initiator, curing agent and accelerator, heat-resisting bicyclic unsaturated polyester resin system are made up of heat-resisting bicyclic unsaturated polyester resin and crosslinking agent, and system viscosity is 300~400s；Heat-resisting bicyclic unsaturated polyester resin is prepared by dicyclopentadiene, at least one polyacid and at least one polyalcohol through polycondensation reaction；Crosslinking agent is at least one in methyl propenoic acid glycidyl ether, sodium dodecyl allyl base acid esters, diallyphthalate acid esters, trimethylolpropane allyl ester；Modified epoxy is obtained by unsaturated polyester modified.The impregnating resin has that excellent storage stability, heat-resist, cured product high mechanical strength, adhesion strength are high, electrical insulation properties are good, dielectric loss is small, the low feature of water absorption rate, applied widely.
Description
Technical field
The present invention relates to the preparation field of impregnating varnish, more particularly to a kind of environment-friendly type wind-driven generator VPI impregnating resins
And preparation method thereof.
Background technology
VPI is the abbreviation of technique of vacuum pressure for dipping electrical, i.e. Vacuum Pressure Impregnating.VPI is high pressure
Important technique in the electrical equipment such as motor, transformer, power capacitor and paper insulated high voltage power cable and electrical material production
Process, after VPI PROCESS FOR TREATMENTs, the good insulation preformance of the said goods, temperature rise reduction, raising efficiency, the mechanical strength that increases, solution
The loosening phenomenon of running, prevent the insulation faults such as short circuit, improve moisture protection, increase the service life.
Now, domestic each motor manufacturer all employ VPI substantially in production high-voltage motor and small power generation unit
Technology, and manufacturer in middle-size and small-size low voltage motor also has and begin to use this technology, thus in the market to VPI with without molten
Also just increasing, requirement of many producers to solvent-free impregnating resin, except vacuum to be met is measured the need for agent impregnating resin
Special performance requirement of the pressure impregnation to impregnating varnish is outer, it is necessary to which adapting to each factory drop aborning can lower consumption and multiduty need
Will, it is desirable to which height Medium-voltage Motor is general, common electric machine and special machines is general, big motor and general H-C grades of small machine are general.So
Impregnating bath, buying convenience, convenient management, energy-saving can be reduced.
According to the difference of matrix resin, solvent-free impregnating resin generally can be divided into epoxide resin type, unsaturated polyester type, two
Phenylene ether resins type, polyesterimide type, polyimide type and organic silicon type.And wherein, unsaturated polyester type is due to excellent
Chemical-resistance, anti-moisture performance, electrical insulation properties, viscosity is relatively low, bin stability preferably, and can be easy to dipping, turn into
The Main way of domestic and international solvent-free impregnating resin development.But cure shrinkage is larger, adhesion strength is relatively low, air because it has
Oxygen inhibition causes the poor shortcoming of dry tack free performance, therefore it need to be modified.
The Chinese patent literature of Publication No. CN106046731A discloses a kind of environment friendly heat resistant impregnating resin, composition
For：Heat resistant unsaturated polyester resin, cycloaliphatic epoxy resin and bisphenol A epoxide resin, curing agent, DCP, to tert-butyl o benzene two
Phenol, reactive diluent.The impregnating resin is also disclosed in document and can be used for the varnished insulation application of separation generator.The dipping
Although resin formula is with heat resistance higher, have that dielectric loss is big, adhesion strength is low, water absorption rate is high asks mostly
Reactive diluent is added in topic, and formula, also there is a problem of that solidification fugitive constituent is big.
The content of the invention
The invention provides a kind of environment-friendly type wind-driven generator VPI impregnating resins, the impregnating resin has storage stabilization
Good, heat-resist, the cured product high mechanical strength of property, adhesion strength is high, electrical insulation properties are good, dielectric loss is small, water absorption rate
Low feature, it is applied widely.
Specific technical scheme is as follows：
A kind of environment-friendly type wind-driven generator VPI impregnating resins, by mass percentage, its component includes：
Described heat-resisting bicyclic unsaturated polyester resin system includes heat-resisting bicyclic unsaturated polyester resin and crosslinking agent, body
The viscosity of system is 200~300s, and the test of the viscosity uses 4# flow cups, and test temperature is 25 DEG C, similarly hereinafter；
Described heat-resisting bicyclic unsaturated polyester resin is polynary by dicyclopentadiene, at least one polyacid and at least one
Alcohol is prepared through polycondensation reaction；
Described crosslinking agent is sodium dodecyl allyl base acid esters, diallyphthalate acid esters, trimethylolpropane two
One or more in allyl ester；
Described modified epoxy is obtained by unsaturated polyester modified, and the viscosity of unsaturated polyester (UP) is 500~700s.
The system that solvent-free impregnating resin of the invention is made up of heat-resisting bicyclic unsaturated polyester (UP) and extraordinary crosslinking agent, then
What the epoxy blend unsaturated polyester modified with low viscosity was prepared, system has good compatibility and matching in itself
Property, and have the advantages that two systems of unsaturated polyester (UP)-epoxy resin synchronously solidify, then it is equipped with high performance curing agent and friendship
Connection agent, makes to be released without small molecule in its solidification process, therefore curing process is good.Ensure that impregnating resin solidification fugitive constituent it is small,
Excellent storage stability, heat-resist and all kinds of middle glue and dry mica paper tape have good compatibility.Cured product machinery is strong
The features such as degree is high, electrical insulation properties are good, dielectric loss is small, water absorption rate is small.It is true so as to be applied to H, C grade of big-and-middle-sized high-voltage motor
The varnished insulation treatment of pneumatics power mass-impregnation and electrical equipment winding.
Preferably, described polyacid be selected from maleic anhydride, fumaric acid, terephthalic acid (TPA), benzoic acid, oneself two
Acid, dihydromethyl propionic acid, phthalic acid；
Described polyalcohol is selected from neopentyl glycol, methyl propanediol or diglycol.
Further preferably, the acid number of described heat-resisting bicyclic unsaturated polyester resin is controlled in 20~25mgKOH/g.
Further preferably, described heat-resisting bicyclic unsaturated polyester resin is dicyclopentadiene by mol ratio：Maleic anhydride：
Neopentyl glycol：Terephthalic acid (TPA)：Fumaric acid：Methyl propanediol=0.6：0.5：2.3：1.0：1.0：0.6 various of monomer is through contracting
Poly- reaction is prepared.Cooled down after viscosity and acid number reach regulation requirement, add a certain amount of crosslinking agent to be configured to feature and glue
Spend the heat-resisting bicyclic unsaturated polyester resin system of scope.
Preferably, described modified epoxy is by above-mentioned unsaturated polyester (UP) and bisphenol A type epoxy resin, phenolic aldehyde ring
It is obtained through addition reaction for one or more in oxygen tree fat, para-aminophenol epoxy resin.
Further preferably, described unsaturated polyester (UP) be by mol ratio be phthalic anhydride：Neopentyl glycol：One contracting diethyl
Glycol：Benzoic acid：Dihydromethyl propionic acid=0.5：1.2：0.45：1.0：0.2 various of monomer is prepared through through polycondensation reaction,
It is used further to the modified of epoxy resin.
Preferably, described initiator is benzoyl peroxide and/or cumyl peroxide；
Described curing agent is at least one in anhydrides, boron amide class, imidazoles；
Described accelerator is metal salt of organic carboxylic acid and/or acetyl acetone salt.
Further preferably, described curing agent is tung oil acid anhydride or phenylimidazole；
Described accelerator is at least one of aluminium acetylacetonate, isooctyl acid potassium, cobalt naphthenate.
Under above-mentioned preferred each raw material, further, by mass percentage, its component includes：
The invention also discloses the preparation method of above-mentioned environment-friendly type wind-driven generator VPI impregnating resins, step is as follows：
(1) heat-resisting bicyclic unsaturated polyester resin is mixed with a part of crosslinking agent, obtains system viscosity for 100~200s
Heat-resisting bicyclic unsaturated polyester resin system；
(2) after by heat-resisting bicyclic unsaturated polyester resin system, another part crosslinking agent and other components uniformly mixing, obtain
To described environment-friendly type wind-driven generator VPI impregnating resins.
The crosslinking agent used in the present invention point two parts are added, and a part is first mixed with heat-resisting bicyclic unsaturated polyester resin
Close, for adjusting the viscosity of heat-resisting bicyclic unsaturated polyester resin system in suitable scope.Another part is in other groups
Added when dividing blending, it is therefore an objective to adjust the viscosity of impregnating resin.For convenience of producing, the crosslinking agent that two parts are added uses identical
Kind, but different cultivars can be also used, only need to be in the crosslinking agent variety range of above-mentioned restriction.
When impregnating resin is used, can be according to impregnation technology be selected the need for specific, impregnation technology should be that this area institute is public
Know, will not be described in detail herein.Preferred condition of cure is：Solidify 4~6 hours at 140~150 DEG C first, then 170~180
DEG C solidification 8~10 hours.
Due to the implementation of above technical scheme, the present invention has the following advantages that compared with prior art：
Environment-friendly type wind-driven generator VPI impregnating resins disclosed by the invention mainly include heat-resisting bicyclic unsaturated polyester (UP) tree
Resin system, extraordinary crosslinking agent and modified epoxy are well mixed and can be prepared by low viscosity, high bond strength, low dielectric loss
Impregnating resin.Its manufacturing process is simple, composition good stability, stable performance brilliance.
Environment-friendly type wind-driven generator VPI impregnating resins prepared by the present invention are applied widely, are applicable not only to big-and-middle-sized
The varnished insulation treatment of high-voltage motor vacuum pressure mass-impregnation and electrical equipment winding, while being applicable to the electricity of various temperature resistant grades
Machine electric appliance, be also applied for vat immerse, continuously immerse, VPI impregnation technologies, rotary roasting etc. technological requirement.
Specific embodiment
Embodiment 1
The formula of environment-friendly type wind-driven generator VPI impregnating resins is as follows in the present embodiment：
Heat-resisting bicyclic unsaturated polyester (UP) is dicyclopentadiene by mol ratio：Maleic anhydride：Neopentyl glycol：Terephthaldehyde
Acid：Fumaric acid：Methyl propanediol=0.6：0.5：2.3：1.0：1.0：0.6 various of monomer is prepared through polycondensation reaction.
Heat-resisting bicyclic unsaturated polyester (UP) system by above-mentioned preparation heat-resisting bicyclic unsaturated polyester (UP) and trimethylolpropane two
Allyl ester (TMPTA) is 6 in mass ratio:4 are mixed to get.
Modified epoxy presses 10 by unsaturated polyester (UP) and epoxy resin (bisphenol A type epoxy resin):100 mass ratio is mixed
After conjunction, obtained through addition reaction.
Unsaturated polyester (UP) is phthalic anhydride by mol ratio：Neopentyl glycol：Diglycol：Benzoic acid：Dihydroxy first
Base propionic acid=0.5：1.2：0.45：1.0：0.2 various of monomer is prepared through through polycondensation reaction.
It is cumyl peroxide by heat-resisting 50 grams of bicyclic unsaturated polyester (UP) system, modified epoxy 30g, initiator
(DCP) 0.8 gram, crosslinking agent be 15 grams of trimethylolpropane allyl ester (TMPTA), curing agent be 5 grams of tung oil acid anhydride, promote
Agent cobalt naphthenate 0.4g.
After above-mentioned each component is well mixed by formula, that is, environment-friendly type wind-driven generator VPI impregnating resins are obtained.The leaching
Stain resin when in use, should solidify 4~6 hours at 140~150 DEG C first, then solidify 8~10 hours at 170~180 DEG C,
That is curable film-forming.
The preparation of heat-resisting bicyclic unsaturated polyester (UP) in the heat-resisting bicyclic unsaturated polyester (UP) system used in following embodiment
Method and consumption are identical with the embodiment, and the crosslinking agent kind for using is listed in specific embodiment is defined.
Embodiment 2
The formula of the environment-friendly type wind-driven generator VPI impregnating resins of this example is：
50 grams of heat-resisting bicyclic unsaturated polyester (UP), modified epoxy 30g, initiator are benzoyl peroxide (BPO) 1.4
Gram, crosslinking agent be 10 grams of diallyphthalate acid esters (DAP), curing agent be 5 grams of tung oil acid anhydride, accelerator aluminium acetylacetonate
0.6g。
By above-mentioned each component by formula it is well mixed after, then after be well mixed by formula with other each components, i.e., prepared ring
Guarantor's type wind-driven generator VPI impregnating resins.The impregnating resin when in use, should be small in 140~150 DEG C of solidifications 4~6 first
When, then solidify 8~10 hours at 170~180 DEG C, you can film-forming.
Embodiment 3
The formula of the environment-friendly type wind-driven generator VPI impregnating resins of this example is：
50 grams of heat-resisting bicyclic unsaturated polyester (UP), modified epoxy 30g, initiator are benzoyl peroxide (BPO) 1.6
Gram, crosslinking agent be 10 grams of sodium dodecyl allyl base acid esters, 5 grams of diallyphthalate acid esters (DAP), curing agent be phenyl miaow
3 grams of azoles, accelerator aluminium acetylacetonate 0.6g.
By above-mentioned each component by formula it is well mixed after, then after be well mixed by formula with other each components, i.e., prepared ring
Guarantor's type wind-driven generator VPI impregnating resins.The impregnating resin when in use, should be small in 140~150 DEG C of solidifications 4~6 first
When, then solidify 8~10 hours at 170~180 DEG C, you can film-forming.
Embodiment 4
The formula of the environment-friendly type wind-driven generator VPI impregnating resins of this example is：
50 grams of heat-resisting bicyclic unsaturated polyester (UP), modified epoxy 30g, initiator are cumyl peroxide (DCP) 0.8
Gram, crosslinking agent be 10 grams of diallyphthalate acid esters (DAP), curing agent be 3 grams of phenylimidazole, accelerator isooctyl acid potassium
0.1g and cobalt naphthenate 0.3g.
By above-mentioned each component by formula it is well mixed after, then after be well mixed by formula with other each components, i.e., prepared ring
Guarantor's type wind-driven generator VPI impregnating resins.The impregnating resin when in use, should be small in 140~150 DEG C of solidifications 4~6 first
When, then solidify 8~10 hours at 170~180 DEG C, you can film-forming.
Embodiment 5
The formula of the environment-friendly type wind-driven generator VPI impregnating resins of this example is：
50 grams of heat-resisting bicyclic unsaturated polyester (UP), modified epoxy 30g, initiator are cumyl peroxide (DCP) 0.8
Gram, crosslinking agent be 10 grams of trimethylolpropane allyl ester (TMPTA), 5 grams of sodium dodecyl allyl base acid esters, curing agent be paulownia
5 grams of oil anhydride, accelerator isooctyl acid potassium 0.1g and cobalt naphthenate 0.3g.
By above-mentioned each component by formula it is well mixed after, then after be well mixed by formula with other each components, i.e., prepared ring
Guarantor's type wind-driven generator VPI impregnating resins.The impregnating resin when in use, should be small in 140~150 DEG C of solidifications 4~6 first
When, then solidify 8~10 hours at 170~180 DEG C, you can film-forming.
Be the beneficial effect for further proving environment-friendly type wind-driven generator VPI impregnating resins of the present invention, to embodiment 1~
5 performances for preparing product are tested according to the corresponding national standard of insulated paint, the results are shown in Table 1.
Table 1
As shown in Table 1, the present invention prepare environment-friendly type wind-driven generator VPI impregnating resins have excellent storage stability,
Heat-resist, cured product high mechanical strength, adhesion strength are high, electrical insulation properties are good, dielectric loss is small, the low spy of water absorption rate
Point.
Further, the product for being prepared by embodiment in the present invention 1 and H grades of epoxy ester type general on domestic market
VPI impregnating resins contrasted, performance test is carried out according to the national standard of insulated paint, the results are shown in Table 2.
Table 2
As shown in Table 2, the environment-friendly type wind-driven generator VPI impregnating resins that prepared by the present invention, than domestic H grades of general ring
The heat resistance of the VPI impregnating resins of oxygen ester type wants a grade high, the characteristics of its is maximum be that dielectric loss is small, adhesion strength is high,
Water absorption rate is low, storage stability is excellent.
Claims (10)
1. a kind of environment-friendly type wind-driven generator VPI impregnating resins, it is characterised in that by mass percentage, its component includes：
Described heat-resisting bicyclic unsaturated polyester resin system includes heat-resisting bicyclic unsaturated polyester resin and crosslinking agent, system
Viscosity is 100~200s；
Described heat-resisting bicyclic unsaturated polyester resin is passed through by dicyclopentadiene, at least one polyacid and at least one polyalcohol
Polycondensation reaction is prepared；
Described crosslinking agent is methyl propenoic acid glycidyl ether, sodium dodecyl allyl base acid esters, diallyphthalate acid
At least one in ester, trimethylolpropane allyl ester；
Described modified epoxy is obtained by unsaturated polyester modified, and the viscosity of unsaturated polyester (UP) is 500~700s.
2. environment-friendly type wind-driven generator VPI impregnating resins according to claim 1, it is characterised in that described is polynary
Acid is selected from maleic anhydride, fumaric acid, terephthalic acid (TPA), benzoic acid, adipic acid or dihydromethyl propionic acid；
Described polyalcohol is selected from neopentyl glycol, methyl propanediol or diglycol.
3. environment-friendly type wind-driven generator VPI impregnating resins according to claim 2, it is characterised in that described is heat-resisting
The acid number of bicyclic unsaturated polyester resin is controlled in 20~25mgKOH/g.
4. environment-friendly type wind-driven generator VPI impregnating resins according to claim 3, it is characterised in that described is heat-resisting
Bicyclic unsaturated polyester resin is by dicyclopentadiene, maleic anhydride, terephthalic acid (TPA), fumaric acid, neopentyl glycol and methyl
Propane diols is prepared by following mol ratio through polycondensation reaction：
Dicyclopentadiene：Maleic anhydride：Neopentyl glycol：Terephthalic acid (TPA)：Fumaric acid：Methyl propanediol=0.6：0.5：
2.3：1.0：1.0：0.6.
5. environment-friendly type wind-driven generator VPI impregnating resins according to claim 4, it is characterised in that described is heat-resisting
In bicyclic unsaturated polyester resin system, the mass ratio of heat-resisting bicyclic unsaturated polyester resin and crosslinking agent is 6:4.
6. environment-friendly type wind-driven generator VPI impregnating resins according to claim 1, it is characterised in that the unsaturation
Polyester is by phthalic anhydride, benzoic acid, dihydromethyl propionic acid, neopentyl glycol and diglycol by following mol ratio through contracting
Poly- reaction is prepared：
Phthalic anhydride：Neopentyl glycol：Diglycol：Benzoic acid：Dihydromethyl propionic acid=0.5：1.2：0.45：1.0：
0.2。
7. environment-friendly type wind-driven generator VPI impregnating resins according to claim 1, it is characterised in that described initiation
Agent is benzoyl peroxide and/or cumyl peroxide；
Described curing agent is at least one in anhydrides, boron amide class, imidazoles；
Described accelerator is metal salt of organic carboxylic acid and/or acetyl acetone salt.
8. environment-friendly type wind-driven generator VPI impregnating resins according to claim 7, it is characterised in that described solidification
Agent is tung oil acid anhydride or phenylimidazole；
Described accelerator is at least one of aluminium acetylacetonate, isooctyl acid potassium, cobalt naphthenate.
9. the environment-friendly type wind-driven generator VPI impregnating resins according to claim 1~8 any claim, its feature
It is that by mass percentage, its component includes：
10. a kind of environment-friendly type wind-driven generator VPI impregnating resins according to claim 1~9 any claim
Preparation method, it is characterised in that step is as follows：
(1) heat-resisting bicyclic unsaturated polyester resin is mixed with a part of crosslinking agent, it is the resistance to of 100~200s to obtain system viscosity
The bicyclic unsaturated polyester resin system of heat；
(2) after by heat-resisting bicyclic unsaturated polyester resin system, another part crosslinking agent and other components uniformly mixing, institute is obtained
The environment-friendly type wind-driven generator VPI impregnating resins stated.
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| CN108440718A (en) * | 2018-01-27 | 2018-08-24 | 嘉兴市新大陆机电有限公司 | Low volatilization trickle resin of a kind of high bond strength and preparation method thereof |
| CN108441132A (en) * | 2018-01-31 | 2018-08-24 | 嘉兴市新大陆机电有限公司 | A kind of thermosetting resin type insulating self-adhesive band and preparation method thereof |
| CN108441132B (en) * | 2018-01-31 | 2020-10-30 | 浙江博菲电气股份有限公司 | Thermosetting resin type insulating self-adhesive tape and preparation method thereof |
| CN108484920A (en) * | 2018-03-08 | 2018-09-04 | 嘉兴市新大陆机电有限公司 | A kind of high bond strength environment-friendly type vacuum pressure impregnating resin |
| CN108484920B (en) * | 2018-03-08 | 2021-03-23 | 浙江博菲电气股份有限公司 | High-bonding-strength environment-friendly vacuum pressure impregnating resin |
| CN110885543A (en) * | 2019-11-29 | 2020-03-17 | 湖北长海新能源科技有限公司 | Organic silicon modified unsaturated resin insulation impregnating resin and preparation method thereof |
| CN111560101A (en) * | 2020-05-18 | 2020-08-21 | 浙江博菲电气股份有限公司 | Composition for use in VPI process |
| CN111560101B (en) * | 2020-05-18 | 2022-06-17 | 浙江博菲电气股份有限公司 | Composition for use in VPI process |
| CN112408869A (en) * | 2020-11-19 | 2021-02-26 | 贺州学院 | Styrene-free artificial stone and preparation method thereof |
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| CN106811023B (en) | 2019-08-06 |
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