CN115011217A - Insulating baking varnish and preparation method thereof - Google Patents
Insulating baking varnish and preparation method thereof Download PDFInfo
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- CN115011217A CN115011217A CN202210713429.XA CN202210713429A CN115011217A CN 115011217 A CN115011217 A CN 115011217A CN 202210713429 A CN202210713429 A CN 202210713429A CN 115011217 A CN115011217 A CN 115011217A
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- curing agent
- epoxy resin
- baking varnish
- epoxy
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- 239000002966 varnish Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000004593 Epoxy Substances 0.000 claims abstract description 52
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 42
- 239000003973 paint Substances 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000010276 construction Methods 0.000 claims abstract description 16
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 11
- 239000002270 dispersing agent Substances 0.000 claims abstract description 9
- 239000006184 cosolvent Substances 0.000 claims abstract description 8
- 239000000945 filler Substances 0.000 claims abstract description 7
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 claims abstract description 7
- 239000006254 rheological additive Substances 0.000 claims abstract description 7
- 239000003822 epoxy resin Substances 0.000 claims description 26
- 229920000647 polyepoxide Polymers 0.000 claims description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 239000006185 dispersion Substances 0.000 claims description 18
- 239000004576 sand Substances 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 17
- BDLXTDLGTWNUFM-UHFFFAOYSA-N 2-[(2-methylpropan-2-yl)oxy]ethanol Chemical compound CC(C)(C)OCCO BDLXTDLGTWNUFM-UHFFFAOYSA-N 0.000 claims description 12
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 11
- 229910000077 silane Inorganic materials 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 239000000049 pigment Substances 0.000 claims description 9
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 7
- 239000004841 bisphenol A epoxy resin Substances 0.000 claims description 6
- 238000003801 milling Methods 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- JXUKBNICSRJFAP-UHFFFAOYSA-N triethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCOCC1CO1 JXUKBNICSRJFAP-UHFFFAOYSA-N 0.000 claims description 5
- 239000000440 bentonite Substances 0.000 claims description 4
- 229910000278 bentonite Inorganic materials 0.000 claims description 4
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 238000010790 dilution Methods 0.000 claims description 2
- 239000012895 dilution Substances 0.000 claims description 2
- WHGNXNCOTZPEEK-UHFFFAOYSA-N dimethoxy-methyl-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](C)(OC)CCCOCC1CO1 WHGNXNCOTZPEEK-UHFFFAOYSA-N 0.000 claims description 2
- 229910021485 fumed silica Inorganic materials 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 claims description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000003860 storage Methods 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 description 17
- 238000000576 coating method Methods 0.000 description 17
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 description 16
- 239000000463 material Substances 0.000 description 9
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 239000004848 polyfunctional curative Substances 0.000 description 5
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- CUVLMZNMSPJDON-UHFFFAOYSA-N 1-(1-butoxypropan-2-yloxy)propan-2-ol Chemical compound CCCCOCC(C)OCC(C)O CUVLMZNMSPJDON-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000004408 titanium dioxide Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000010433 feldspar Substances 0.000 description 2
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- 239000011147 inorganic material Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229920000620 organic polymer Polymers 0.000 description 2
- QQQSFSZALRVCSZ-UHFFFAOYSA-N triethoxysilane Chemical compound CCO[SiH](OCC)OCC QQQSFSZALRVCSZ-UHFFFAOYSA-N 0.000 description 2
- CUDYYMUUJHLCGZ-UHFFFAOYSA-N 2-(2-methoxypropoxy)propan-1-ol Chemical compound COC(C)COC(C)CO CUDYYMUUJHLCGZ-UHFFFAOYSA-N 0.000 description 1
- XNSIKGLUWHSURK-UHFFFAOYSA-N C(CC)[Si](OCC)(OCC)OCC.[O] Chemical compound C(CC)[Si](OCC)(OCC)OCC.[O] XNSIKGLUWHSURK-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910018557 Si O Inorganic materials 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 125000003545 alkoxy group Chemical group 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004356 hydroxy functional group Chemical group O* 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000005476 size effect Effects 0.000 description 1
- -1 so that on one hand Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/4007—Curing agents not provided for by the groups C08G59/42 - C08G59/66
- C08G59/4085—Curing agents not provided for by the groups C08G59/42 - C08G59/66 silicon containing compounds
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
-
- 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
- C09D7/20—Diluents or solvents
-
- 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
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
Abstract
The invention relates to the technical field of paint, in particular to insulating baking varnish which comprises the following components in parts by mass: liquid epoxy resin, dispersant, filler, rheological additive and nano SiO 2 Nano MgO, cosolvent and modified epoxy curing agent. Also discloses a preparation method of the insulating baking varnish. The invention improves the heat conductivity, the flame resistance and the insulativity of the insulating baking varnish; the product adopts a mode of adding water during construction, thereby not only reducing the VOC content, but also avoiding directly adding the VOC into the paint liquidThe oil-water separation phenomenon generated by water ensures the storage stability of the paint liquid.
Description
Technical Field
The invention relates to the technical field of paint, in particular to insulating baking varnish and a preparation method thereof.
Background
The magnetic ring is widely used in the fields of electric power, electronics, data communication equipment and the like as an important anti-interference element. In order to ensure the stability of the equipment, the magnetic ring must have good electric breakdown resistance, heat resistance and other characteristics, so a protective layer for protection and insulation needs to be coated on the surface.
The existing magnetic ring protective coating is mostly formed by spraying solvent type magnetic ring insulating paint made of epoxy resin. The common solvent type epoxy magnetic ring insulating paint contains a large amount of organic solvents such as alcohols, aromatic hydrocarbons and the like, the VOC content is far more than 500g/L during construction, the environment is seriously polluted, and the human health is threatened. In some high-performance products, such as high-voltage electrical appliances, the working temperature needs to be more than 200 ℃, and the common magnetic ring insulating paint cannot be used at the temperature; and fire prevention and control of enterprises and companies have been raised to a certain degree today, which requires electronic components to have higher flame resistance. However, when the magnetic ring is used as an anti-interference element, it needs to have very high resistance to electrical breakdown, which must ensure that the edge of the magnetic ring is covered with a thick coating. Therefore, the magnet ring needs to be preheated at high temperature before the magnet ring insulating paint is sprayed, and the environment-friendly water-based epoxy magnet ring insulating paint is also produced at present, but the construction solid content is lower, the thickness of the once sprayed magnet ring is too high, and the defects that the high-temperature magnet ring is easy to generate air holes and the like are overcome.
Disclosure of Invention
The invention provides the insulating baking varnish and the preparation method thereof to solve the technical defects, and the obtained insulating baking varnish has lower VOC content and good heat resistance, flame resistance and insulating property.
The invention discloses an insulating baking varnish which comprises the following components in parts by mass:
21-29 parts of liquid epoxy resin, 0.3-1 part of dispersant, 40-50 parts of filler, 5-15 parts of pigment, 0.3-2 parts of rheological additive and 0.5-3 parts of nano SiO 2 1-3.5 parts of nano MgO, 5-12 parts of cosolvent and 8-17 parts of modified epoxy curing agent.
The liquid epoxy resin is one or more of bisphenol A type epoxy resin E-51, E-44 and E-42.
The dispersing agent is one or more of 760W, BYK-190 and BYK-102.
The filler is one or more of talcum powder, barium sulfate and feldspar powder.
The rheological additive is one or more of BYK-410, bentonite powder and fumed silica.
Nano SiO 2 Has an average particle diameter of 20 nm.
The average grain diameter of the nano MgO is 30 nm.
The cosolvent is one or more of propylene glycol methyl ether, dipropylene glycol butyl ether and ethylene glycol tertiary butyl ether.
The pigment is one or more of titanium dioxide, phthalocyanine blue, 191 pigment yellow and PR-272 red.
The modified epoxy curing agent comprises the following components: 65-74 parts of epoxy curing agent, 15-25 parts of solvent, 8-12 parts of epoxy resin liquid and 1-4 parts of epoxy silane liquid.
The epoxy curing agent is hydroxy alkylated polyurethane, can be selected from model 5769, and is produced by Shanghai resin factory Co.
The solvent is one or more of propylene glycol methyl ether, ethylene glycol tertiary butyl ether and dipropylene glycol methyl ether.
The epoxy resin liquid is a mixed solution of epoxy resin and ethylene glycol tertiary butyl ether 1:1, wherein the epoxy resin is bisphenol A epoxy resin with the molecular weight of 400-30000.
The epoxy silane liquid is a mixed solution of epoxy silane and ethylene glycol tert-butyl ether 1:1-1.2, wherein the epoxy silane is one or more of 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane and 3-glycidoxypropylmethyldimethoxysilane.
The preparation method of the modified epoxy curing agent comprises the steps of adding 65-74 parts of epoxy curing agent and 15-25 parts of solvent into a reactor, heating to 65-70 ℃, then dropwise adding 8-12 parts of epoxy resin liquid for 1-2 hours, keeping the temperature for 2-3 hours after dropwise adding, dropwise adding 1-4 parts of epoxy silane liquid for 1-2 hours, keeping the temperature for 2-3 hours after dropwise adding, cooling to normal temperature, and discharging to obtain the modified epoxy curing agent.
The active hydrogen equivalent of the modified epoxy curing agent is 60-80, the solid content is 70-80%, and the viscosity is less than or equal to 700 mpa.s.
A preparation method of insulating baking varnish comprises the steps of putting 21-29 parts of liquid epoxy resin, 0.3-1 part of dispersing agent and 4-9 parts of cosolvent into a drawn cylinder of a cooling device with a jacket, and regulating the rotation speed of a basket type sand mill to 200r/min for dispersing for 10-20 min; after dispersion, sequentially adding 5-15 parts of pigment, 40-50 parts of filler and 0.3-2 parts of rheological additive, regulating the rotation speed of a basket type sand mill to 600r/min, and controlling the sand milling temperature to be below 45 ℃; sanding until the required fineness is reached, transferring the pulling cylinder to a dispersion machine, regulating the rotating speed to 300r/min, and sequentially adding 0.5-3 parts of nano SiO 2 1-3.5 parts of nano MgO, regulating the rotating speed to 1000r/min after the nano MgO is added, and dispersing at a high speed for 20-30 min; after dispersion, 1-3 parts of cosolvent is used for adjusting the viscosity to be proper, and a standby paint is obtained; during construction, the ratio of the standby paint to the modified epoxy curing agent is 100: 8-10, adding the modified epoxy curing agent into the standby paint vehicle, uniformly stirring, and then adding 18-25 parts of water for dilution to obtain the insulating baking paint.
In the scheme, the insulating baking varnish is a coating, the adopted dispersing agent can greatly improve the wettability of the pigment and the filler, reduce the viscosity of the coating and reduce the time required by the dispersing and grinding processes, and the pigment has excellent colorability and high coating film gloss after water is added; the epoxy resin molecular chain segment is introduced into a specific curing agent molecular structure, and the amino group with the strongest activity in the original curing agent is completely reacted, so that the curing agent and the epoxy resin have similar molecular chain segments, thereby having good compatibility, being capable of emulsifying the low molecular weight epoxy resin, and the product can be used by adding water during construction, so that the prepared coating has low VOC content, simultaneously, the floating color and the blooming phenomenon of the product after adding water is improved, and the phenomena of grain rising and amine white caused by too short curing time during construction are avoided; epoxy functional agglomerated silane chain segments are introduced into molecules of the curing agent, so that on one hand, epoxy functional groups and alkoxy carried by the curing agent have dual reactivity, and can be subjected to bidirectional chemical reaction with inorganic materials and organic polymers to improve the degree of combination, bonding and compatibility between the inorganic materials and the organic polymers, thereby improving the mechanical properties, water resistance and other properties of the coating;on the other hand, since the difference in electronegativity between Si and O atoms is large and the polarity of Si-O bond is large, a shielding effect is exerted on the group to be bonded, and the heat resistance of the coating film is improved. Adding nano SiO into the paint 2 And nano MgO: nano SiO 2 The high fluidity and small size effect of the coating enable the surface of the material to be more compact and finer, the friction coefficient to be smaller, and the hardness and the wear resistance of the coating to be greatly enhanced due to the high strength of the nano particles; and the thermal expansion coefficient and the curing molding shrinkage rate of the composite material can be reduced, the thermal deformation temperature of the polymer is improved, and the heat resistance of the coating is enhanced. During combustion, the nano-MgO can form a more compact and thermally stable carbon layer on the surface of the substrate, and the excellent carbon layer inhibits the transmission of heat and combustible gas, thereby improving the flame resistance.
According to the insulating baking varnish and the preparation method thereof, the obtained insulating baking varnish can be used on the surface of a magnetic ring; has the following beneficial effects:
according to the invention, a specific curing agent is modified, and Si and epoxy resin molecular chain segments are introduced into curing agent molecules, so that on one hand, a paint film has better adhesive force, water resistance and heat resistance after being cured, and on the other hand, the curing agent and the epoxy resin have similar molecular chain segments, so that the curing agent and the epoxy resin have good compatibility, low-molecular-weight epoxy resin can be emulsified, the product can be used by adding water, and the VOC content is reduced;
secondly, the self-made curing agent is applied to the waterborne epoxy insulating baking paint to prepare the high-solid low-viscosity waterborne epoxy insulating baking paint, the VOC content is less than or equal to 200g/L, and the environment is protected; the coating has excellent edge covering performance, an effective thick film is formed at the edge of the magnetic ring, and the voltage resistance is excellent;
thirdly, nano SiO is added into the product 2 The heat resistance and the hardness strength of the coating are enhanced; the nano MgO is added, so that a very fine, uniform and hard net-shaped structure can be formed on the surface of the coating, the coating is protected from being damaged, the wear resistance of the coating is improved, and the hardness of the coating can also be improved; the heat resistance, the flame resistance and the insulativity of the insulating coating are improved by the synergistic effect of the two;
and fourthly, the product adopts a water adding mode during construction, so that the VOC content can be reduced, the oil-water separation phenomenon caused by directly adding water into the paint liquid is avoided, and the storage stability of the paint liquid is ensured.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present invention will be given with reference to the preferred embodiments.
Modified epoxy curing agent 1:
the invention discloses a modified epoxy curing agent, which is prepared by the following steps:
adding 71 kg of 5769 epoxy curing agent and 18 kg of propylene glycol methyl ether into a reaction kettle, heating to 65-70 ℃, firstly dropwise adding 9 kg of 50% E-44 epoxy resin liquid for 2h, keeping the temperature for 2h after dropwise adding, then dropwise adding 2 kg of 50% 3-glycidyl ether oxypropyl triethoxysilane for 2h, keeping the temperature for 2h after dropwise adding, cooling, and discharging to obtain the modified epoxy curing agent. Wherein 50% of E-44 epoxy resin liquid refers to: e-44 bisphenol A epoxy resin and ethylene glycol tertiary butyl ether 1:1 mixed solution; the 50% of 3-glycidyl ether oxygen propyl triethoxysilane refers to: 3-glycidoxypropyltriethoxysilane and ethylene glycol tert-butyl ether 1: 1.
Modified epoxy curing agent 2:
the invention discloses a modified epoxy curing agent, which is prepared by the following steps:
adding 69 kg of 5769 epoxy curing agent and 15 kg of propylene glycol methyl ether into a reaction kettle, heating to 65-70 ℃, firstly dropwise adding 12 kg of 50% E-42 epoxy resin liquid for 1h, keeping the temperature for 2h after dropwise adding, then dropwise adding 4 kg of 50% 3-glycidyl ether oxypropyl triethoxysilane for 1-2h, keeping the temperature for 2h after dropwise adding, cooling, and discharging to obtain the modified epoxy curing agent. Wherein 50% of E-44 epoxy resin liquid refers to: e-42 bisphenol A epoxy resin and ethylene glycol tert-butyl ether 1:1 mixed solution; the 50% of 3-glycidoxypropyltriethoxysilane is: 3-glycidoxypropyltriethoxysilane and ethylene glycol tert-butyl ether 1: 1.
Example 1:
the invention discloses an insulating baking varnish, which is prepared by the following steps:
putting 29 kg of bisphenol A type epoxy resin E-44, 0.6 kg of dispersant 760W and 8 kg of dipropylene glycol butyl ether into a cylinder with a jacket cooling device, and adjusting the rotation speed of a basket type sand mill to 200r/min for dispersing for 20 min; after uniform dispersion, sequentially adding 5 kg of phthalocyanine blue, 50 kg of feldspar powder and 1.5 kg of BYK-410, and adjusting the rotation speed of a basket type sand mill to 600r/min, wherein the sand milling temperature is controlled below 45 ℃; sanding until the required fineness is reached, transferring the pulling cylinder to a dispersion machine, regulating the rotating speed to 300r/min, and sequentially adding 1.6 kg of nano SiO 2 2.3 kg of nano MgO, regulating the rotation speed to 1000r/min after the nano MgO is added, and dispersing for 30min at a high speed; after uniform dispersion, 3 kg of dipropylene glycol butyl ether was added to a suitable viscosity and discharged for use. During construction, according to the spare materials: the modified epoxy hardener 1 was added in an amount of 9.0 kg to the stock, and 25 kg of deionized water was added to the stock to a suitable construction viscosity, and the product was ready for use.
Example 2:
the invention discloses an insulating baking varnish, which is prepared by the following steps:
27 kg of bisphenol A epoxy resin E-42, 0.8 kg of BYK-102 and 7 kg of propylene glycol methyl ether are put into a drawing cylinder of a cooling device with a jacket, the rotational speed of a basket type sand mill is adjusted to 200r/min, and the mixture is dispersed for 20 min; after uniform dispersion, 13 kg of 191 pigment yellow, 46 kg of talcum powder and 0.6 kg of BYK-410 are sequentially added, the rotation speed of a basket type sand mill is adjusted to 600r/min, and the sand milling temperature is controlled below 45 ℃; sanding until the required fineness is reached, transferring the pulling cylinder to a dispersion machine, regulating the rotating speed to 300r/min, and sequentially adding 2 kg of nano SiO 2 1.6 kg of nano MgO, regulating the rotation speed to 1000r/min after the nano MgO is added, and dispersing for 30min at a high speed; after uniform dispersion, 2 kg of propylene glycol methyl ether is added to reach a proper viscosity, and the mixture is discharged for later use. During construction, according to the spare materials: adding 8 kg of modified epoxy curing agent into the spare material according to the proportion of 100:8Curing agent 1, and adding 18 kg of deionized water to a proper construction viscosity.
Example 3:
the invention discloses an insulating baking varnish, which is prepared by the following steps:
putting 26 kg of bisphenol A epoxy resin E-44, 1.0 kg of BYK-190 and 8 kg of propylene glycol methyl ether into a cylinder of a cooling device with a jacket, regulating the rotation speed of a basket type sand mill to 200r/min, and dispersing for 20 min; after uniform dispersion, sequentially adding 8.5 kg of titanium dioxide, 1.5 kg of PR-272 red, 48 kg of talcum powder and 1.0 kg of bentonite powder, and regulating the rotation speed of a basket type sand mill to 600r/min, wherein the sand milling temperature is controlled below 45 ℃; sanding to reach the required fineness, transferring the pulling cylinder to a dispersion machine, regulating the rotating speed to 300r/min, and sequentially adding 1 kg of nano SiO 2 3 kg of nano MgO, regulating the rotating speed to 1000r/min after the nano MgO is put into the reactor, and dispersing the nano MgO at a high speed for 30 min; after uniform dispersion, 2 kg of propylene glycol methyl ether is added to reach a proper viscosity, and the mixture is discharged for later use. During construction, according to the spare materials: the modified epoxy hardener 2 of 9 kg is added into the spare material according to the proportion of 100:9, and 20 kg of deionized water is added to reach the proper construction viscosity, so that the modified epoxy hardener can be used.
Example 4:
the invention discloses an insulating baking varnish, which is prepared by the following steps:
putting 29 kg of bisphenol A type epoxy resin E-51, 1.2 kg of BYK-102 and 6 kg of ethylene glycol tert-butyl ether into a cylinder of a cooling device with a jacket, adjusting the rotation speed of a basket type sand mill to 200r/min, and dispersing for 20 min; after uniform dispersion, sequentially adding 10 kg of titanium dioxide, 46 kg of talcum powder and 1.3 kg of bentonite powder, adjusting the rotation speed of a basket type sand mill to 600r/min, and controlling the sand milling temperature to be below 45 ℃; sanding until the required fineness is reached, transferring the pulling cylinder to a dispersion machine, regulating the rotating speed to 300r/min, and sequentially adding 3 kg of nano SiO 2 1.5 kg of nano MgO, after the nano MgO is added, adjusting the rotation speed to 1000r/min, and dispersing at a high speed for 30 min; after the dispersion is uniform, 2 kg of ethylene glycol tertiary butyl ether is added to reach a proper viscosity, and the mixture is discharged for standby. During construction, according to the spare materials: the modified epoxy curing agent is prepared in a ratio of 10:1 for standby10 kg of modified epoxy curing agent 2 is added into the material, and 20 kg of deionized water is added to reach proper construction viscosity, so that the material can be used.
In the production processes of the above examples 1 to 4, the modified epoxy hardener 1 and the modified epoxy hardener 2, the amounts of the components can be enlarged or reduced in equal proportion.
The insulating baking varnish obtained in the above examples 1 to 4 is used for preparing a varnish film on a magnetic ring according to the following process conditions:
the preheating temperature of the coated object is 125 +/-5 ℃, and the preheating time is 30 min.
The curing conditions of the paint film were (135 ℃ C.) X (30 min).
The paint films were subjected to the performance tests, and the results are shown in Table 1 below.
Table 1 results of performance testing
Although the present invention has been described with reference to the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but may be embodied or carried out in various forms without departing from the spirit and scope of the invention.
Claims (10)
1. An insulating baking varnish is characterized in that: the adhesive comprises the following components in parts by mass:
21-29 parts of liquid epoxy resin, 0.3-1 part of dispersant, 40-50 parts of filler, 5-15 parts of pigment, 0.3-2 parts of rheological additive and 0.5-3 parts of nano SiO 2 1-3.5 parts of nano MgO, 5-12 parts of cosolvent and 8-17 parts of modified epoxy curing agent.
2. The insulating baking varnish as claimed in claim 1, wherein: the liquid epoxy resin is one or more of bisphenol A type epoxy resin E-51, E-44 and E-42.
3. The insulating baking varnish as claimed in claim 1, wherein: the dispersing agent is one or more of 760W, BYK-190 and BYK-102.
4. The insulating baking varnish as claimed in claim 1, wherein: the rheological additive is one or more of BYK-410, bentonite powder and fumed silica.
5. The insulating baking varnish as claimed in claim 1, wherein: the modified epoxy curing agent comprises the following components: 65-74 parts of epoxy curing agent, 15-25 parts of solvent, 8-12 parts of epoxy resin liquid and 1-4 parts of epoxy silane liquid.
6. An insulating baking varnish as claimed in claim 5, wherein: the epoxy curing agent is hydroxyl alkylated polyurethane.
7. An insulating baking varnish as claimed in claim 5, wherein: the epoxy resin liquid is a mixed solution of epoxy resin and ethylene glycol tertiary butyl ether 1:1, wherein the epoxy resin is bisphenol A epoxy resin with the molecular weight of 400-30000.
8. An insulating baking varnish as claimed in claim 5, wherein: the epoxy silane liquid is a mixed solution of epoxy silane and ethylene glycol tert-butyl ether 1:1-1.2, wherein the epoxy silane is one or more of 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane and 3-glycidoxypropylmethyldimethoxysilane.
9. An insulating baking varnish as claimed in claim 5, wherein: the preparation method of the epoxy curing agent comprises the following steps: adding 65-74 parts of epoxy curing agent and 15-25 parts of solvent into a reactor, heating to 65-70 ℃, then dropwise adding 8-12 parts of epoxy resin liquid for 1-2 hours, keeping the temperature for 2-3 hours after dropwise adding, dropwise adding 1-4 parts of epoxy silane liquid for 1-2 hours, keeping the temperature for 2-3 hours after dropwise adding, cooling to normal temperature, and discharging to obtain the modified epoxy curing agent.
10. A method for preparing the insulated baking varnish according to claim 1, wherein the method comprises the following steps: putting 21-29 parts of liquid epoxy resin, 0.3-1 part of dispersant and 4-9 parts of cosolvent into a drawn cylinder, regulating the rotating speed of a basket type sand mill to 200r/min, and dispersing for 10-20 min; after dispersion, sequentially adding 5-15 parts of pigment, 40-50 parts of filler and 0.3-2 parts of rheological additive, regulating the rotation speed of a basket type sand mill to 600r/min, and controlling the sand milling temperature to be below 45 ℃; sanding until the required fineness is reached, transferring the pulling cylinder to a dispersion machine, regulating the rotating speed to 300r/min, and sequentially adding 0.5-3 parts of nano SiO 2 1-3.5 parts of nano MgO, regulating the rotating speed to 1000r/min after the nano MgO is added, and dispersing at a high speed for 20-30 min; after dispersion, 1-3 parts of cosolvent is used for adjusting the viscosity to be proper, and the standby paint is obtained; during construction, the proportion of the standby paint to the modified epoxy curing agent is 100: 8-10, adding a modified epoxy curing agent into the standby paint vehicle, and then adding 18-25 parts of water for dilution to obtain the insulating baking paint.
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