CN118126623A - Preparation method and application of fast-curing protective coating - Google Patents
Preparation method and application of fast-curing protective coating Download PDFInfo
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- 239000011253 protective coating Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 72
- 238000000576 coating method Methods 0.000 claims abstract description 62
- -1 acrylic ester Chemical class 0.000 claims abstract description 42
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 29
- 229920000570 polyether Polymers 0.000 claims abstract description 29
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000178 monomer Substances 0.000 claims abstract description 23
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 19
- 125000005442 diisocyanate group Chemical group 0.000 claims abstract description 17
- 238000001723 curing Methods 0.000 claims description 75
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- 238000006116 polymerization reaction Methods 0.000 claims description 25
- 239000007788 liquid Substances 0.000 claims description 18
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- 239000003054 catalyst Substances 0.000 claims description 17
- 239000003112 inhibitor Substances 0.000 claims description 16
- 239000003973 paint Substances 0.000 claims description 16
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- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- MZRQZJOUYWKDNH-UHFFFAOYSA-N diphenylphosphoryl-(2,3,4-trimethylphenyl)methanone Chemical compound CC1=C(C)C(C)=CC=C1C(=O)P(=O)(C=1C=CC=CC=1)C1=CC=CC=C1 MZRQZJOUYWKDNH-UHFFFAOYSA-N 0.000 claims description 13
- NWVVVBRKAWDGAB-UHFFFAOYSA-N p-methoxyphenol Chemical group COC1=CC=C(O)C=C1 NWVVVBRKAWDGAB-UHFFFAOYSA-N 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 8
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 claims description 7
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- IAXXETNIOYFMLW-COPLHBTASA-N [(1s,3s,4s)-4,7,7-trimethyl-3-bicyclo[2.2.1]heptanyl] 2-methylprop-2-enoate Chemical compound C1C[C@]2(C)[C@@H](OC(=O)C(=C)C)C[C@H]1C2(C)C IAXXETNIOYFMLW-COPLHBTASA-N 0.000 claims description 7
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 7
- 230000001680 brushing effect Effects 0.000 claims description 7
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
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- 238000005507 spraying Methods 0.000 claims description 6
- 238000001291 vacuum drying Methods 0.000 claims description 6
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 5
- 150000002430 hydrocarbons Chemical group 0.000 claims description 4
- 125000004386 diacrylate group Chemical group 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 229920001451 polypropylene glycol Polymers 0.000 claims description 3
- IMNIMPAHZVJRPE-UHFFFAOYSA-N triethylenediamine Chemical compound C1CN2CCN1CC2 IMNIMPAHZVJRPE-UHFFFAOYSA-N 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 2
- XMLYCEVDHLAQEL-UHFFFAOYSA-N 2-hydroxy-2-methyl-1-phenylpropan-1-one Chemical compound CC(C)(O)C(=O)C1=CC=CC=C1 XMLYCEVDHLAQEL-UHFFFAOYSA-N 0.000 claims 2
- 230000018044 dehydration Effects 0.000 claims 1
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- 238000007599 discharging Methods 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 238000004078 waterproofing Methods 0.000 claims 1
- 238000007334 copolymerization reaction Methods 0.000 abstract 1
- 150000003254 radicals Chemical class 0.000 abstract 1
- YPFDHNVEDLHUCE-UHFFFAOYSA-N 1,3-propanediol Substances OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N acetone Substances CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 10
- 239000000203 mixture Substances 0.000 description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 238000003848 UV Light-Curing Methods 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- DNIAPMSPPWPWGF-VKHMYHEASA-N (+)-propylene glycol Chemical compound C[C@H](O)CO DNIAPMSPPWPWGF-VKHMYHEASA-N 0.000 description 6
- 229940035437 1,3-propanediol Drugs 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 238000013008 moisture curing Methods 0.000 description 6
- 229920000166 polytrimethylene carbonate Polymers 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000011056 performance test Methods 0.000 description 5
- 239000003208 petroleum Substances 0.000 description 5
- 239000004814 polyurethane Substances 0.000 description 5
- 229920002635 polyurethane Polymers 0.000 description 5
- JQVDAXLFBXTEQA-UHFFFAOYSA-N dibutylamine Chemical compound CCCCNCCCC JQVDAXLFBXTEQA-UHFFFAOYSA-N 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 3
- 230000005587 bubbling Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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- 239000008103 glucose Substances 0.000 description 3
- 239000005431 greenhouse gas Substances 0.000 description 3
- 229920005862 polyol Polymers 0.000 description 3
- 150000003077 polyols Chemical class 0.000 description 3
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 3
- FRPHFZCDPYBUAU-UHFFFAOYSA-N Bromocresolgreen Chemical compound CC1=C(Br)C(O)=C(Br)C=C1C1(C=2C(=C(Br)C(O)=C(Br)C=2)C)C2=CC=CC=C2S(=O)(=O)O1 FRPHFZCDPYBUAU-UHFFFAOYSA-N 0.000 description 2
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 2
- 239000005058 Isophorone diisocyanate Substances 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- 240000008042 Zea mays Species 0.000 description 2
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 2
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 235000005822 corn Nutrition 0.000 description 2
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- 150000002009 diols Chemical class 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- DDKIXUQHRSUCMN-UHFFFAOYSA-N n-butylbutan-1-amine;propan-2-one Chemical compound CC(C)=O.CCCCNCCCC DDKIXUQHRSUCMN-UHFFFAOYSA-N 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
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- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 description 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- 229920002261 Corn starch Polymers 0.000 description 1
- 238000001157 Fourier transform infrared spectrum Methods 0.000 description 1
- 229920001730 Moisture cure polyurethane Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000002519 antifouling agent Substances 0.000 description 1
- HIFVAOIJYDXIJG-UHFFFAOYSA-N benzylbenzene;isocyanic acid Chemical group N=C=O.N=C=O.C=1C=CC=CC=1CC1=CC=CC=C1 HIFVAOIJYDXIJG-UHFFFAOYSA-N 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
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- 229910052740 iodine Inorganic materials 0.000 description 1
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- 150000002513 isocyanates Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000000691 measurement method Methods 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- DNIAPMSPPWPWGF-UHFFFAOYSA-N monopropylene glycol Natural products CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 1
- 239000003348 petrochemical agent Substances 0.000 description 1
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- 238000000016 photochemical curing Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
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- Paints Or Removers (AREA)
Abstract
The invention relates to a preparation method of a fast-curing protective coating, and belongs to the technical field of coatings. The protective coating consists of polyether glycol, diisocyanate, hydroxyl-containing acrylic ester, photoinitiator and acrylic ester monomer, and is prepared by ultraviolet light-excited free radical copolymerization, and then is crosslinked and cured by moisture in the air. The polyether glycol is polytrimethylene ether glycol with molecular weight in the range of 1000-2000. The fast-curing protective coating can be fast cured by ultraviolet light, can be completely cured in air, and has good performance.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a preparation method of a rapid-curing protective coating.
Background
Along with the rapid development of economic technology, the coating technology and the product are applied to the aspects of daily life of people. The Ultraviolet (UV) curing coating has the advantages of high curing speed, low energy consumption, cleanness, environmental protection and the like, and is favored by the market. The composition of the UV curable coating typically includes acrylate monomers or prepolymers, reactive diluents, photoinitiators, catalysts, and the like. Wherein the structure and composition of the acrylate monomers determine the properties of the film after curing of the coating. In recent years, polyurethane has a unique soft and hard segment microphase separation structure, so that the polyurethane has the characteristics of excellent tensile strength, tear resistance, wear resistance, flexibility, elasticity, good weather resistance, chemical corrosion resistance and the like. The UV-cured polyurethane acrylate copolymer coating can be prepared by combining the polyurethane serving as a resin matrix with an acrylic active monomer or a prepolymer and a photo-curing technology, so that the UV-cured polyurethane acrylate copolymer coating has a wide application prospect.
However, under some applications and conditions, the UV-curable protective coating may cause incomplete curing of the coating surface and tackiness, which may seriously affect the protective properties of the coating. The partially cured protective coating has the defect of insufficient mechanical properties, and the coating is easy to damage during transportation or use. Some polyether diols used in UV curable protective coating formulations, such as poly (1, 2-propanediol), polytetrahydrofuran diol, and the like, are petroleum petrochemicals, and petroleum is a non-renewable resource.
The polyether glycol used in the fast-curing protective coating prepared by the invention is polytrimethylene ether glycol (PO 3G), and the PO3G is polymerized from 1, 3-propanediol or a byproduct generated in the production process of the 1, 3-propanediol. According to US20050020805, starch in corn is extracted and converted into glucose, then 1, 3-propylene glycol can be produced through fermentation means, PO3G can be produced through polymerization of the 1, 3-propylene glycol, and according to WO2008039466, PO3G is a biological base material and is an ideal substitute for petroleum-derived polyol, so that greenhouse gas emission and non-renewable energy consumption can be reduced, and the method is very green and environment-friendly.
Disclosure of Invention
The invention relates to a preparation method and application of a fast-curing protective coating, which can be fast cured by UV (ultraviolet) within 5-10s and can be cured thoroughly by finishing surface moisture curing within 1 hour. The coating has high gel rate and good comprehensive properties such as mechanical property, water resistance and the like. The application of the rapid curing protective coating can be used for dust prevention and water prevention on a printed circuit board, and plays a role in protecting the circuit board. The rapid curing protective coating can realize rapid ultraviolet curing and complete curing after being placed in air. The ultraviolet light cured film has short surface drying time and good mechanical properties (tensile strength and elongation at break). The polyether glycol is PO3G, the PO3G is polymerized from 1, 3-propanediol, starch in corn is extracted according to U.S. patent No. 20050020805 and is converted into glucose, 1, 3-propanediol can be produced by fermentation means, and the PO3G can be produced by polymerizing the 1, 3-propanediol; chinese patent application CN1816509a describes a method for purifying 1, 3-propanediol, using the kettle residue to produce PO3G, providing the possibility for such by-products to be fully utilized; according to WO2008039466, PO3G is a bio-based material, is an ideal substitute for petroleum-derived polyol, can reduce non-renewable energy consumption and greenhouse gas emission, is very green and environment-friendly, and accords with the national current carbon peak and carbon neutralization 'double carbon' policy.
The invention relates to a rapid curing protective coating, which consists of polyether glycol, diisocyanate, hydroxyl-containing acrylic ester, a catalyst, a polymerization inhibitor, a photoinitiator and an acrylic ester monomer, wherein the polyether glycol is polytrimethylene ether glycol, and the molecular weight is controlled between 1000 (PO 3G-H1000) and 2000 (PO 3G-H2000);
The diisocyanate comprises one or more of Toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI) and isophorone diisocyanate (IPDI);
the hydroxyl-containing acrylate comprises one of hydroxyethyl methacrylate (HEMA) and hydroxyethyl acrylate (HEA);
the catalyst comprises one of 1, 4-diazabicyclo [2.2.2] octane (DABCO) and dibutyl tin dilaurate (DBTDL);
The polymerization inhibitor is p-hydroxyanisole (MEHQ);
The photoinitiator is one of 2-hydroxy-2-methyl-1-phenyl-1-acetone (UV-1173) and trimethylbenzoyl-diphenyl phosphine oxide (TPO).
The acrylic ester monomer is one or more of isobornyl acrylate (IBOA), isobornyl methacrylate (IBOMA) and polypropylene glycol (n=13) diacrylate (PPGDA).
The polyether glycol accounts for 55-75% of the total mass of the paint, the diisocyanate accounts for 8-15% of the total mass of the paint, the hydroxyl-containing acrylic ester accounts for 0.1-5% of the total mass of the paint, the photoinitiator accounts for 1-4% of the total mass of the paint, the acrylic ester monomer accounts for 15-30% of the total mass of the paint, the catalyst accounts for 0.09-1% of the total mass of the paint, the polymerization inhibitor accounts for 0.09-1% of the total mass of the paint, and the specific preparation steps are as follows:
S1, under the protection of nitrogen, placing polyether glycol after vacuum drying and water removal into a container, heating to 75-90 ℃ and stirring, then adding diisocyanate monomer, hydroxyl-containing acrylic ester, polymerization inhibitor and catalyst, controlling the temperature to 75-90 ℃ and stirring and reacting for 2-3 hours, and after the reaction is finished, adding acrylic ester monomer and photoinitiator into the container, and uniformly mixing;
S2, curing and film forming: spraying/brushing the mixed solution on the surface of an object to be protected, placing the object in an ultraviolet curing machine, irradiating the object with ultraviolet rays for 5-10s to cure the object into a film, and placing the film in air for 3-10 days to realize complete curing.
Preferably, polyether glycol accounts for 70.65% of the total mass of the coating, diisocyanate accounts for 8.20% of the total mass of the coating, hydroxyl-containing acrylic ester accounts for 1.67% of the total mass of the coating, photoinitiator accounts for 3.30% of the total mass of the coating, acrylic ester monomer accounts for 15.99% of the total mass of the coating, catalyst accounts for 0.09% of the total mass of the coating, and polymerization inhibitor accounts for 0.09% of the total mass of the coating;
Preferably, the polyether glycol is polytrimethylene ether glycol comprising one or more of PO3G-H1000, PO3G-H2000, the structural formula of PO3G is as follows:
wherein n is the degree of polymerization of the polymerized repeat unit, ranging from 17 to 35;
Preferably, the application method of the coating liquid in step S2 is as follows: spraying or brushing the protective coating liquid on the surface to be protected to form a liquid film with the thickness of 1-2000 um, then curing in general ultraviolet curing equipment, and then placing in air for 5-7 days to realize complete curing.
The specific preparation method is as follows:
S1, under the protection of nitrogen, placing PO3G-H2000 subjected to vacuum drying and water removal into a container, heating to 90 ℃ and stirring, adding TDI, HEA, MEHQ and DABCO, and controlling the temperature to 90 ℃ and stirring and reacting for 3 hours to obtain the oligomer with the following structure.
Wherein R 1 is a polyether chain structure corresponding to polytrimethylene ether glycol PO 3G-H2000; r 2 is the corresponding hydrocarbon chain structure in TDI; r 3、R4 is one of-NCO and-NHCOOCH 2CH2OCOCH＝CH2 respectively; n is the average degree of polymerization and is between 1 and 5 (theoretical value).
After the reaction is finished, adding IBOA, PPGDA and TPO into a container, and uniformly mixing;
S2, curing and film forming: pouring the mixed solution into a tetrafluoroethylene mold with the depth of 2mm, spreading and leveling to prepare a coating, curing the coating into a film by irradiation of an ultraviolet lamp for 10s in a BFDUV-XIK ultraviolet curing machine manufactured by Shenzhen Bofeida technology Co., ltd, and placing the film in the air for one week to realize complete curing.
Meanwhile, corresponding performance tests are respectively carried out after ultraviolet light curing and moisture thoroughly curing.
Compared with the prior art, the invention has the technical effects and advantages that:
(1) The fast-curing protective coating prepared by the invention can be fast cured at normal temperature, can be completely cured by reacting with moisture in air, has the surface drying time of less than or equal to 1h, and solves the problem of surface tackiness of the traditional ultraviolet curing coating. The UV rapid curing can be realized, and then the UV rapid curing can be rapidly and thoroughly cured in the air, so that the comprehensive protective performance of the coating is improved.
(2) The rapid-curing protective coating prepared by the invention has good mechanical properties, and the curing conditions are simple and rapid. The invention is a solvent-free system, has the characteristics of low energy consumption and no solvent residue, has better application prospect, and can be widely applied to the surface protection of various materials such as printed circuit boards and the like. The obtained protective coating has low viscosity and good workability, can be infiltrated on the surface of a circuit board, can not generate bubbling after UV curing, and has good comprehensive protective performance.
(3) The invention relates to a rapid curing protective coating, wherein the polyether glycol is PO3G, can be prepared from fermentation products such as corn starch or glucose, belongs to the category of biological bases, is an ideal substitute for petroleum source polyol, can reduce non-renewable energy consumption and greenhouse gas emission caused by using petroleum products, has the characteristics of environmental protection and carbon emission reduction, and accords with the national 'double carbon' policy of carbon peak and carbon neutralization.
(4) Obtained unexpectedly by a number of experiments: the specific ingredients and mass fractions of example 5 were such that complete UV curing could be achieved and the surface drying time was the shortest, and the best performance ratios for tensile strength, elongation at break, gel fraction and water absorption could be achieved, with the best results as fast curing protective coatings.
Drawings
FIG. 1 is a FTIR spectrum of example 5.
Fig. 2 is a photograph of a printed circuit board before protection.
FIG. 3 is a photograph of a printed circuit board protected by the coating mixture prepared in example 5.
Detailed Description
The present invention will be further described in detail by way of examples with reference to the following examples. The described embodiments are only some of the embodiments of the present invention and do not limit the other claims of the present invention.
A fast-curing protective coating is composed of polyether glycol, diisocyanate, hydroxyl-containing acrylate, catalyst, polymerization inhibitor, photoinitiator and acrylate monomer;
the polyether glycol is polytrimethylene ether glycol PO3G, with molecular weights of 1000 (PO 3G-H1000) and 2000 (PO 3G-H2000), purchased from Du Bangtai Telaier, U.S.A.;
The diisocyanate comprises one or more of Toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI) and isophorone diisocyanate (IPDI), wherein TDI and IPDI are purchased from Shanghai Bi to get medical science and technology Co., ltd, and MDI is purchased from Wanhua chemical Co., ltd;
The hydroxyl-containing acrylic ester comprises one of hydroxyethyl methacrylate (HEMA) and hydroxyethyl acrylate (HEA), and is purchased from Guangzhou Hui and chemical industry Co., ltd;
The catalyst comprises one of 1, 4-diazabicyclo [2.2.2] octane (DABCO) and dibutyl tin dilaurate (DBTDL), which are purchased from Aba Ding Shiji (Shanghai) limited company;
the polymerization inhibitor is p-hydroxyanisole (MEHQ) purchased from Shanghai Bi to be obtained from medical science and technology Co., ltd;
the photoinitiator is one of 2-hydroxy-2-methyl-1-phenyl-1-acetone (UV-1173) and trimethyl benzoyl-diphenyl phosphine oxide (TPO) and is purchased from Shanghai Bi to be obtained from medical science and technology Co., ltd;
The polymerizable (methyl) acrylic ester monomer is one or more of isobornyl acrylate (IBOA), isobornyl methacrylate (IBOMA) and polypropylene glycol (n=13) diacrylate (PPGDA), and the three materials are purchased from Shanghai Michelin Biochemical technology Co., ltd.
The polyether glycol accounts for 55-75% of the total mass of the paint, the diisocyanate accounts for 8-15% of the total mass of the paint, the hydroxyl-containing acrylic ester accounts for 0.1-5% of the total mass of the paint, the photoinitiator accounts for 1-4% of the total mass of the paint, the acrylic ester monomer accounts for 15-30% of the total mass of the paint, the catalyst accounts for 0.09-1% of the total mass of the paint, the polymerization inhibitor accounts for 0.09-1% of the total mass of the paint, and the specific preparation steps are as follows:
S1, under the protection of nitrogen, placing polyether glycol after vacuum drying and water removal into a container, heating to 75-90 ℃ and stirring, then adding diisocyanate monomer, hydroxyl-containing acrylic ester, polymerization inhibitor and catalyst, controlling the temperature to 75-90 ℃ and stirring and reacting for 2-3 hours, and after the reaction is finished, adding acrylic ester monomer and photoinitiator into the container, and uniformly mixing;
S2, curing and film forming: spraying or brushing the protective coating liquid on the surface to be protected to form a liquid film with the thickness of 1-2000 um, curing in general ultraviolet curing equipment, and then placing in air for 3-10 days to realize complete curing.
Preferably, polyether glycol accounts for 70.65% of the total mass of the coating, diisocyanate accounts for 8.20% of the total mass of the coating, hydroxyl-containing acrylic ester accounts for 1.67% of the total mass of the coating, photoinitiator accounts for 3.30% of the total mass of the coating, acrylic ester monomer accounts for 15.99% of the total mass of the coating, catalyst accounts for 0.09% of the total mass of the coating, and polymerization inhibitor accounts for 0.09% of the total mass of the coating;
The polyether glycol is polytrimethylene ether glycol PO3G, and comprises one or more of PO3G-H1000 and PO3G-H2000, and the structural formula of the PO3G is as follows:
Wherein n is the polymerization degree of the polymerization repeating unit and is 17-35;
and S2, the thickness of the coating is controlled to be 1-2000 um, the coating is irradiated in an ultraviolet curing box, and after the ultraviolet curing is finished, the coating is placed in the air for a period of time to realize complete curing.
The specific preparation method is as follows:
S1, under the protection of nitrogen, placing PO3G-H2000 subjected to vacuum drying and water removal into a container, heating to 90 ℃ and stirring, adding TDI, HEA, MEHQ and DABCO, and controlling the temperature to 90 ℃ and stirring and reacting for 3 hours to obtain the oligomer with the following structure.
Wherein R 1 is a polyether chain structure corresponding to polytrimethylene ether glycol PO 3G-H2000; r 2 is the corresponding hydrocarbon chain structure in TDI; r 3、R4 is one of-NCO and-NHCOOCH 2CH2OCOCH＝CH2 respectively; n is the average degree of polymerization and is between 1 and 5 (theoretical value).
After the reaction is finished, adding IBOA, PPGDA and TPO into a container, and uniformly mixing;
S2, spraying or brushing the protective coating liquid on the surface to be protected to form a liquid film with the thickness of 1-2000 um, curing in common ultraviolet curing equipment, and then placing in air for 5-7 days to realize complete curing;
In order to test the performance of the cured protective film, the mixed solution is poured into a tetrafluoroethylene mold with the depth of 2mm to be scraped, and the film is put into a BFDUV-XIK ultraviolet curing machine (a 365nm light source is adopted by an ultraviolet lamp, the power density is 60W/cm 2, and the distance between a sample and light is 10 cm) manufactured by Shenzhen Bofeida technology Co., ltd, and after the film is irradiated by the ultraviolet lamp for 10 seconds, the film is placed in the air for one week to realize complete curing.
Meanwhile, corresponding performance tests are respectively carried out after ultraviolet light curing and moisture thoroughly curing.
Brushing a thin layer on the printed circuit board uniformly by using a brush, putting the printed circuit board into a ultraviolet curing machine (365 nm light source is adopted by ultraviolet lamp, the power density is 60W/cm 2, and the distance between a sample and light is 10 cm) of BFDUV-XIK of Shenzhen Bofeida technology Co., ltd, taking out the printed circuit board after 10s irradiation by the ultraviolet lamp, and placing the printed circuit board in a room temperature environment for 7 days, so as to compare the appearance and the protective performance of the printed circuit board before and after the printed circuit board is protected by the coating mixed liquid.
The following are specific examples:
Examples 1 to 9
The quick-curing protective coating is prepared from the following raw materials in parts by weight:
table 1: examples 1 to 9 raw materials:
The rapid curing protective coating obtained in the above examples 1-9 was poured into a tetrafluoroethylene mold with a depth of 2mm, scraped, put into a ultraviolet curing machine (365 nm light source is adopted by ultraviolet lamp, power density is 60W/cm 2, and the distance between the sample and the lamp light is 10 cm) of Shenzhen Bofeida technology Co., ltd BFDUV-XIK, and after 10s irradiation by ultraviolet lamp, the UV curing condition of each example was examined. The UV cure was determined by touching the side of the film that was not exposed to air, and if very dry (good), it was considered to be completely UV cured, and if liquid or sticky, it was not completely UV cured (poor). After ultraviolet curing, the mixture is placed in air to be subjected to moisture curing, and the surface drying time is recorded to show the moisture curing speed. The tensile strength, elongation at break and gel fraction were tested after one week, and the test performance results of the obtained cured protective paint of the above formula are shown in table 2:
Table 2: performance of examples 1 to 9:
Comparative examples 1 to 2
The quick-curing protective coating is prepared from the following raw materials in parts by weight:
Table 3: comparative examples 1 to 2 parts by weight of raw materials
| Name of the name | Comparative example 1 | Comparative example 2 |
| IPDI/part | 0 | 0 |
| TDI/part | 3.48 | 3.48 |
| MDI (diphenyl methane diisocyanate) part | 0 | 0 |
| PO 3G-H2000/serving | 30.00 | 30.00 |
| PO 3G-H1000/parts | 0 | 0 |
| HEMA/serving | 0.00 | 1.30 |
| HEA/part | 0 | 0 |
| DBTDL/serving | 0.04 | 0.04 |
| DABCO/part | 0 | 0 |
| MEHQ/part | 0.04 | 0.04 |
| IBOA/serving | 0 | 0 |
| IBOMA/part | 1.94 | 1.94 |
| PPGDA/part | 5.06 | 5.06 |
| UV-1173/part | 1.4 | 1.4 |
| TPO/part | 0 | 0 |
The curing and testing methods are the same as in examples 1-9, and the test performance results of the above comparative examples 1-2 are shown in Table 4:
Table 4: performance test of comparative examples 1 to 2:
Example 10
Application example of the coating: the coating liquid mixture obtained in example 5 was uniformly brushed with a thin layer on a printed circuit board (size 9cm x 15 cm), put into a Shenzhen Bofeida technology Co., ltd. BFDUV-XIK ultraviolet curing machine (ultraviolet lamp using 365nm light source with power density 60W/cm 2 and sample distance 10cm from light), taken out after 10s irradiation by ultraviolet lamp, and left in room temperature environment for 7 days, and photographs of the printed circuit board before and after protection by the coating liquid mixture are shown in FIG. 2 (before protection) and FIG. 3 (after protection).
As can be seen from fig. 3, the coating can be uniformly coated on the circuit board, and has good appearance, flatness and transparency after curing, and no wrinkling; good adhesion to the substrate and no bubbling. The properties of the cured film coated on the circuit board are shown in table 5:
table 5: performance test of example 10:
| UV curing conditions | Surface dry time/h | Film thickness/mm | Gel fraction/% | Whether or not to foam | |
| Example 10 | Good quality | 0.9 | ～0.10 | 97.89 | Whether or not |
It was found from examples 1 to 9 that when the amount of the hydroxyl-containing acrylate added is small, complete UV curing was not achieved, and when the mass fraction of-NCO was too low by adding too much hydroxyl-containing acrylate, moisture curing was hardly achieved, and the proportion of complete UV curing and moisture curing time was short was: -the mass fraction of NCO is above 0.25% and the mass fraction of c=c is above 1.47%; the optimal proportion is as follows: the mass fraction of NCO is 0.41%, the mass fraction of c=c is 1.71%, i.e. the addition ratio of all components in example 5 is more appropriate, the mass fraction of carbon-carbon double bonds is higher while ensuring a higher mass fraction of NCO, and the moisture curing rate is also faster while achieving full UV curing. After mechanical property test, the composite material has excellent physical properties, high gel rate, high tensile strength and high elongation at break, and good comprehensive properties. The mass fractions of the components of example 5 are as follows:
30 parts of PO3G-H2000,3.48 parts of TDI,0.71 part of HEA,0.04 part of DABCO,0.04 part of MEHQ,1.73 parts of IBOA,5.06 parts of PPGDA and 1.4 parts of TPO;
Namely, polyether glycol accounts for 70.65% of the total mass of the coating, diisocyanate accounts for 8.20% of the total mass of the coating, hydroxyl-containing acrylic ester accounts for 1.67% of the total mass of the coating, photoinitiator accounts for 3.30% of the total mass of the coating, acrylic ester monomers (IBOA and PPGDA) account for 15.99% of the total mass of the coating, catalyst accounts for 0.09% of the total mass of the coating, and polymerization inhibitor accounts for 0.09% of the total mass of the coating;
the specific preparation method is as follows:
S1, under the protection of nitrogen, placing PO3G-H2000 subjected to vacuum drying and water removal into a container, heating to 90 ℃ and stirring, adding TDI, HEA, MEHQ and DABCO, and controlling the temperature to 90 ℃ and stirring and reacting for 3 hours to obtain the oligomer with the following structure.
Wherein R 1 is a polyether chain structure corresponding to polytrimethylene ether glycol PO 3G-H2000; r 2 is the corresponding hydrocarbon chain structure in TDI; r 3、R4 is one of-NCO and-NHCOOCH 2CH2OCOCH＝CH2; n is the average degree of polymerization and is between 1 and 5.
After the reaction is finished, adding IBOA, PPGDA and TPO into a container, uniformly mixing, and measuring the-NCO mass fraction in the mixture, wherein the test method adopts an acetone-di-n-butylamine method; meanwhile, calculating the mass fraction of the carbon-carbon double bonds according to the added amount HEA, IBOA, PPGDA;
S2, curing and film forming: pouring the mixed solution into a mould, spreading and flattening to prepare a coating, curing for 10s in a ultraviolet curing machine BFDUV-XIK of Shenzhen Bofeida technology Co., ltd., to form a film, placing the film in air, and testing the performance after one week.
As can be seen from example 10, the protective coating liquid obtained by the invention has good appearance, is flat and transparent and does not wrinkle after the printed circuit board is coated and cured; has good adhesion with the base material, no bubbling and good protective performance.
The performance test methods and criteria in tables 1 to 5 are as follows:
(1) -NCO mass fraction determination: the method adopts an acetone-di-n-butylamine method, and the measurement method comprises the following steps: accurately weighing the mass of the measured object to be m (g), adding the measured object to an iodometric bottle, and adding V 1 (mL) acetone to the iodometric bottle to enable the acetone to be completely dissolved. Adding V 2 (mL) di-n-butylamine (enough) into an acetone solution of the polyurethane prepolymer, dripping 3 drops of bromocresol green indicator, shaking uniformly, and standing for 15min. Hydrochloric acid of concentration C (mol/L) was added to an acid burette, titrated into an iodometric flask, and when the color just changed from blue to yellow, the volume of hydrochloric acid consumed at this time was recorded as V 3 (mL). Another iodine flask was used for blank experiments: to this was added acetone of V 1 (mL) and di-n-butylamine of V 2 (mL), 3 drops of bromocresol green indicator were added dropwise, and after shaking, the mixture was shaken and allowed to stand for 15min. Titration with hydrochloric acid at a concentration of C (mol/L) was performed, and the volume of consumed hydrochloric acid was V 4 (mL).
The mass fraction of isocyanate (-NCO) can be calculated according to the following formula, wherein 42.02 is the relative mass of-NCO:
(2) UV cure degree: the side of the touch film that is not exposed to air is considered to be completely UV cured (good) if it is very dry and not completely UV cured (poor) if it is tacky or liquid.
(3) Surface drying time: testing (finger touch) according to GB/T1728-2020 paint film, putty film drying time determination method;
(4) Tensile strength and elongation at break: adopting a CTM2050 microcomputer to control an electronic universal tester, wherein the slicing die is 50 mm or 4mm, and the stretching speed is 10mm/min;
(5) Gel fraction: testing is carried out according to GB/T18447-2001 'test method for crosslinking degree of crosslinked polyethylene (PE-X) pipe and pipe fitting';
(6) Fourier transform infrared spectroscopy FTIR characterization: an NEXUS model 870 infrared spectrometer from NICOLET was used.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the application. Various changes or modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the application. The embodiments of the application and the features of the embodiments may be combined with each other arbitrarily without conflict.
Claims (6)
1. The fast curing protective coating is characterized by comprising polyether glycol, diisocyanate, hydroxyl-containing acrylic ester, a catalyst, a polymerization inhibitor, a photoinitiator and an acrylic ester monomer, wherein the polyether glycol is polytrimethylene ether glycol, and the molecular weight is controlled to be 1000 (PO 3G-H1000) to 2000 (PO 3G-H2000);
The diisocyanate comprises one or more of Toluene Diisocyanate (TDI), diphenylmethane diisocyanate (MDI) and isophorone diisocyanate (IPDI);
the hydroxyl-containing acrylate comprises one of hydroxyethyl methacrylate (HEMA) and hydroxyethyl acrylate (HEA);
the catalyst comprises one of 1, 4-diazabicyclo [2.2.2] octane (DABCO) and dibutyl tin dilaurate (DBTDL);
The polymerization inhibitor is p-hydroxyanisole (MEHQ);
the photoinitiator comprises one of 2-hydroxy-2-methyl-1-phenyl-1-propanone (UV-1173) and trimethylbenzoyl-diphenyl phosphine oxide (TPO).
The acrylate monomer comprises one or more of isobornyl acrylate (IBOA), isobornyl methacrylate (IBOMA), polypropylene glycol (n=13) diacrylate (PPGDA).
2. The method for preparing the rapid curing protective coating according to claim 1, wherein the polyether glycol accounts for 55% -75% of the total mass of the coating, the diisocyanate accounts for 8% -15% of the total mass of the coating, the hydroxyl-containing acrylic ester accounts for 0.1% -5% of the total mass of the coating, the photoinitiator accounts for 1% -4% of the total mass of the coating, the acrylic ester monomer accounts for 15% -30% of the total mass of the coating, the catalyst accounts for 0.09% -1% of the total mass of the coating, and the polymerization inhibitor accounts for 0.09% -1% of the total mass of the coating, and the specific preparation steps are as follows:
S1, under the protection of nitrogen, placing polyether glycol after vacuum dehydration into a container, heating to 75-90 ℃ and stirring, then adding diisocyanate monomer, hydroxyl-containing acrylic ester, polymerization inhibitor and catalyst, controlling the temperature to 75-90 ℃ and stirring and reacting for 2-3 hours, and after the reaction is finished, adding acrylic ester monomer and photoinitiator into the container, and uniformly mixing to obtain the rapid curing protective coating;
S2, curing and film forming: spraying/brushing the mixed solution on the surface of an object to be protected, placing the object in an ultraviolet curing machine, irradiating the object with ultraviolet rays for 5-10s to cure the object into a film, and placing the film in air for 3-10 days to realize complete curing.
3. The method for preparing the rapid curing protective coating according to claim 2, wherein polyether glycol accounts for 70.65% of the total mass of the coating, diisocyanate accounts for 8.20% of the total mass of the coating, hydroxyl-containing acrylic ester accounts for 1.67% of the total mass of the coating, photoinitiator accounts for 3.30% of the total mass of the coating, acrylic ester monomer accounts for 15.99% of the total mass of the coating, catalyst accounts for 0.09% of the total mass of the coating, and polymerization inhibitor accounts for 0.09% of the total mass of the coating.
4. The method of preparing a rapid curing protective coating according to claim 2, wherein the polyether glycol is polytrimethylene ether glycol comprising one or more of PO3G-H1000, PO3G-H2000 having the following structural formula:
wherein n is the degree of polymerization and n is 17 to 35.
5. The preparation method of the rapid-curing protective coating according to claim 2, wherein the rapid-curing protective coating comprises the following components in parts by mass:
the formula of the paint is as follows: 30 parts of PO3G-H2000,3.48 parts of TDI,0.71 part of HEA,0.04 part of DABCO,0.04 part of MEHQ,1.73 parts of IBOA,5.06 parts of PPGDA and 1.4 parts of TPO;
the specific preparation method is as follows:
S1, under the protection of nitrogen, placing PO3G-H2000 subjected to vacuum drying and water removal into a container, heating to 90 ℃ and stirring, adding TDI, HEA, MEHQ and DABCO, and controlling the temperature to 90 ℃ and stirring and reacting for 3 hours to obtain an oligomer with the following structure;
Wherein R 1 is a polyether chain structure corresponding to polytrimethylene ether glycol PO 3G-H2000; r 2 is the corresponding hydrocarbon chain structure in TDI; r 3 is one of-NCO, -NHCOOCH 2CH2OCOCH＝CH2, and R 4 is one of-NCO, -NHCOOCH 2CH2OCOCH＝CH2; n is the average degree of polymerization, between 1 and 5;
After the reaction is finished, adding IBOA, PPGDA and TPO into a container, uniformly mixing to obtain a mixed solution, discharging, sealing and storing;
S2, curing and film forming: spraying/brushing the mixed solution on the surface of an object to be protected to form a liquid film with the thickness of 1-2000 um, placing the liquid film in an ultraviolet curing machine, irradiating the liquid film for 5-10s by ultraviolet rays to cure the liquid film, and placing the liquid film in air for 5-7 days to realize complete curing.
6. The use of a fast curing protective coating according to claim 1, wherein the fast curing protective coating can be used for dust and water proofing on printed circuit boards and serves as a protective circuit board.
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