CN105505136A - UV coating prepared from cyclic carbonate synthesized polyurethane - Google Patents
UV coating prepared from cyclic carbonate synthesized polyurethane Download PDFInfo
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- CN105505136A CN105505136A CN201610004767.0A CN201610004767A CN105505136A CN 105505136 A CN105505136 A CN 105505136A CN 201610004767 A CN201610004767 A CN 201610004767A CN 105505136 A CN105505136 A CN 105505136A
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
- C09D163/10—Epoxy resins modified by unsaturated compounds
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- 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
- C08G71/00—Macromolecular compounds obtained by reactions forming a ureide or urethane link, otherwise, than from isocyanate radicals in the main chain of the macromolecule
- C08G71/04—Polyurethanes
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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
- C09D7/61—Additives non-macromolecular inorganic
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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
-
- 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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Paints Or Removers (AREA)
- Macromonomer-Based Addition Polymer (AREA)
Abstract
The invention provides a UV coating prepared from cyclic carbonate synthesized polyurethane. The UV coating is processed from, by weight, 35-45 parts of epoxy acrylate, 10-20 parts of non-isocyanate polyurethane, 20-25 parts of acrylic acid activated monomers, 0.8-1.2 parts of pentaerythritol, 6-8 parts of silicon oxide nano-particles, 2-3 parts of toluylene biphenyl sodium disulfonate, 2-2.5 parts of photoinitiator, 2.5-3.5 parts of antifoaming agent, 1.5-2.5 parts of US surface improver and 4-8 parts of ABK accelerant. The invention also provides a preparation method of the UV coating. The UV coating is green, environmentally friendly and free of toxicity and has good yellowing resistance; besides, the adhesive force, abrasive resistance and other properties of the coating are greatly improved, and the coating achieves a good effect in terms of application to exterior walls and buildings.
Description
Technical field
The invention belongs to technical field of coatings, particularly a kind of UV coating standby based on the polyurethane of cyclic carbonate ester synthesis, this coating is specially adapted to family or exterior wall building coating.
Background technology
UV coating, i.e. uv radiation curing coating, refer to based on oligopolymer, add specific function monomer, light trigger and auxiliary agent, under uv radiation, light trigger excites and becomes active centre free radical or ion after absorbing energy, thus react containing unsaturated double-bond or epoxy group(ing) material in initiator system, by polymerization, grafting be cross-linked to form cured film.UV is coating material solidified is that the new coating kind on the ground such as America and Europe, Japan is popular at twentieth century end.Be applied to the external coating process of furniture, floor, mobile phone, walkman shell the earliest, its Application Areas now further expands to household appliance technical field and the other fields such as motorcycle and Lacquer finish such as cosmetics containers, televisor and computer.UV photo-cured coating has containing volatile organic compounds (VOC), and environmental pollution is little, and curing speed is fast, save the energy, cured product performance good, be suitable for the advantages such as high-speed automated production.And traditional coating is volatile, curing speed slow, be unfavorable for environment protection.Therefore, UV coating is the main substitute of traditional coating.
Nineteen thirty-seven, since Germanization scholar OttoBayer polyisocyanates and polyol polymerization addition have synthesized urethane, urethane, with outstanding over-all properties, has been widely used in UV coating.All the time, urethane is obtained by reacting by polyisocyanates and polyether glycol, but isocyanic ester itself has severe toxicity, has strong impulse to the eyes of people, skin and respiratory system; Produce the multiplex phosgenation of urethane, phosgene severe toxicity is a kind of strong stimulation, choke damp simultaneously.Suck phosgene and cause pulmonary edema, pneumonia etc., there is lethal danger, to direct labor, there is high risks.
China's paint industry grows stronger day by day under the promotion of downstream industry, and as the building coating of one of them branch, have also been obtained significant progress.Under the guiding of Industry Policy and the pulling in market, China's decorative craft of building will enter new developing period, and the demand of building coating can continue to increase, and industry market development potentiality is huge.In addition, the new countryside construction risen also greatly have stimulated applying of all kinds of building coating.Infer thus, the construction industry of China at least also has the steady progression phase in more than 10 years, also will be 10 years of domestic construction coating production enterprise high speed development.Building coating is mainly used in the coating products of house decoration as a class, and its market development and real estate industry develop closely related.But existing family or non-family safe wall paint contain the objectionable constituent such as isocyanic ester, and adhesivity and wear resistance not good, be for exterior coating by it, easily produce cracking, wear resistance is not good enough, scraping easy damaged.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of standby UV coating of polyurethane based on cyclic carbonate ester synthesis, solving and being existingly applied to the technical problems such as contaminate environment, adhesivity and wear resistance that UV coating used for building exterior wall exists be not good.
The technical solution adopted for the present invention to solve the technical problems is: a kind of UV coating standby based on the polyurethane of cyclic carbonate ester synthesis, is formed by the Raw material processing of following weight part:
Epoxy acrylate 35 ~ 45 parts, non-isocyanate polyurethane 10 ~ 20 parts, vinylformic acid reactive monomer 20 ~ 25 parts, tetramethylolmethane 0.8 ~ 1.2 part, monox nanometer particle 6 ~ 8 parts, stilbene biphenyl sodium disulfonate 2 ~ 3 parts, light trigger 2 ~ 2.5 parts, defoamer 2.5 ~ 3.5 parts, US surface improver 1.5 ~ 2.5 parts, ABK promotor 4 ~ 8 parts;
Wherein said non-isocyanate polyurethane is synthesized by the component of following weight part:
Cyclic carbonate ester 30 ~ 35 parts, binary primary amine compound 60 ~ 65 parts, vinylformic acid reactive monomer 8 ~ 10 parts, E51 epoxy resin 5 ~ 6 parts, bismuth carboxylate 1 ~ 2 part.
Preferably, described binary primary amine compound is diphenyl-methyl methane diamines.
Preferably, described cyclic carbonate ester is preferably terpenyl cyclic carbonate ester.
The above-mentioned UV coating standby based on the polyurethane of cyclic carbonate ester synthesis, its processing step prepared is as follows:
Step one: add a certain amount of epoxy resin, isocaprylic acid zinc and propylene carbonate in autoclave, epoxy resin, mass ratio between isocaprylic acid zinc and propylene carbonate are 5:2:1, are heated to 120 ~ 130 DEG C, pass into CO
2, make pressure remain between 1.3 ~ 1.6MPa, react 5 ~ 6 hours, product is poured out while hot, obtains cyclic carbonate ester through underpressure distillation purifying.
Step 2: cyclic carbonate ester and the E51 epoxy resin of getting respective amount mix in flask, add vinylformic acid reactive monomer and binary primary amine compound successively, control temperature reacts 2 ~ 3 hours between 80 ~ 90 DEG C, drip bismuth carboxylate in reaction process, after reaction terminates, obtain described non-isocyanate polyurethane.
Step 3: stir loading in container after the epoxy acrylate of respective amount and the mixing of vinylformic acid reactive monomer, whipping temp 40 ~ 60 DEG C, stir 2 ~ 3 hours, then the non-isocyanate polyurethane of respective amount, tetramethylolmethane, light trigger, defoamer, stilbene biphenyl sodium disulfonate, ABK promotor is added, mix, add the monox nanometer particle and US surface improver that mix again, stirring is continued 3 hours after being warming up to 60 ~ 80 DEG C, be cooled to room temperature, obtain the described UV coating standby based on the polyurethane of cyclic carbonate ester synthesis.
Positively effect of the present invention: for being applied to speciality coating for building, first UV coating of the present invention is based on non-isocyanate polyurethane, not containing objectionable impuritiess such as isocyanic ester, avoid the pollution to air in coating use procedure, formulation green environment-protecting asepsis of the present invention.The present invention simultaneously utilizes the terpenyl cyclic carbonate ester deriving from the terebinthine epoxy resin of renewable resources and prepare, new direction is opened up in the exploitation that not only can be China's natural reproducible resource, and meet the demand of the people to environment-friendly materials, there is very important economy and social effect.In addition, the present invention adopts epoxy acrylate, non-isocyanate polyurethane collocation vinylformic acid reactive monomer, adding again in conjunction with stilbene biphenyl sodium disulfonate, UV coating is made to have good scratch resistance, US surface improver added with mixing of monox nanometer particle, make nanoparticulate dispersed even, while ensureing not affect photoabsorption, greatly improve the performances such as the sticking power of coating and wear resistance.In a word under the comprehensive action of the present invention's formula, product of the present invention has the advantage that hardness is good, wear resistance is good, adhesive power is good, solvent resistance is good, environmental protection is simultaneously nontoxic, well solve the UV coating Problems existing used in existing family or non-family safe building, on exterior wall is applied, achieve good effect by it.
Embodiment
Below to a preferred embodiment of the present invention will be described in detail.
Embodiment 1
The preferred embodiment of the present invention 1 provides a kind of UV coating standby based on the polyurethane of cyclic carbonate ester synthesis, is formed by the Raw material processing of following weight part:
Epoxy acrylate 35 parts, non-isocyanate polyurethane 10 parts, vinylformic acid reactive monomer 20 parts, tetramethylolmethane 0.8 part, monox nanometer particle 6 parts, stilbene biphenyl sodium disulfonate 2 parts, light trigger 2 parts, defoamer 2.5 parts, US surface improver 1.5 parts, ABK promotor 4 parts;
Wherein said non-isocyanate polyurethane is synthesized by the component of following weight part:
Cyclic carbonate ester 30 parts, binary primary amine compound 60 parts, vinylformic acid reactive monomer 8 parts, E51 epoxy resin 5 parts, bismuth carboxylate 1 part.
Described binary primary amine compound is diphenyl-methyl methane diamines.
Described cyclic carbonate ester is terpenyl cyclic carbonate ester.
Described light trigger is 2-hydroxy-2-methyl-1-phenyl-1-acetone
The above-mentioned UV coating standby based on the polyurethane of cyclic carbonate ester synthesis, its processing step prepared is as follows:
Step one: add a certain amount of epoxy resin, isocaprylic acid zinc and propylene carbonate in autoclave, epoxy resin, mass ratio between isocaprylic acid zinc and propylene carbonate are 5:2:1, are heated to 120 ~ 130 DEG C, pass into CO
2, make pressure remain between 1.3 ~ 1.6MPa, react 5 ~ 6 hours, product is poured out while hot, obtains cyclic carbonate ester through underpressure distillation purifying.
Step 2: cyclic carbonate ester and the E51 epoxy resin of getting respective amount mix in flask, add vinylformic acid reactive monomer and binary primary amine compound successively, control temperature reacts 2 ~ 3 hours between 80 ~ 90 DEG C, drip bismuth carboxylate in reaction process, after reaction terminates, obtain described non-isocyanate polyurethane.
Step 3: stir loading in container after the epoxy acrylate of respective amount and the mixing of vinylformic acid reactive monomer, whipping temp 40 ~ 60 DEG C, stir 2 ~ 3 hours, then the non-isocyanate polyurethane of respective amount, tetramethylolmethane, light trigger, defoamer, stilbene biphenyl sodium disulfonate, ABK promotor is added, mix, add the monox nanometer particle and US surface improver that mix again, stirring is continued 3 hours after being warming up to 60 ~ 80 DEG C, be cooled to room temperature, obtain the described UV coating standby based on the polyurethane of cyclic carbonate ester synthesis.
Embodiment 2
The preferred embodiment of the present invention 2 provides a kind of UV coating standby based on the polyurethane of cyclic carbonate ester synthesis, is formed by the Raw material processing of following weight part:
Epoxy acrylate 45 parts, non-isocyanate polyurethane 20 parts, vinylformic acid reactive monomer 25 parts, tetramethylolmethane 1.2 parts of monox nanometer particles 8 parts, stilbene biphenyl sodium disulfonate 3 parts, light trigger 2.5 parts, defoamer 3.5 parts, US surface improver 2.5 parts, ABK promotor 8 parts;
Wherein said non-isocyanate polyurethane is synthesized by the component of following weight part:
Cyclic carbonate ester 35 parts, binary primary amine compound 65 parts, vinylformic acid reactive monomer 10 parts, E51 epoxy resin 6 parts, bismuth carboxylate 2 parts.
Described binary primary amine compound is diphenyl-methyl methane diamines.
Described cyclic carbonate ester is terpenyl cyclic carbonate ester.
Described light trigger is 2-hydroxy-2-methyl-1-phenyl-1-acetone.
Preparation method is with embodiment 1.
Embodiment 3
The preferred embodiment of the present invention 3 provides a kind of UV coating standby based on the polyurethane of cyclic carbonate ester synthesis, is formed by the Raw material processing of following weight part:
Epoxy acrylate 40 parts, non-isocyanate polyurethane 15 parts, vinylformic acid reactive monomer 22 parts, tetramethylolmethane 1 part, monox nanometer particle 7 parts, stilbene biphenyl sodium disulfonate 2.5 parts, light trigger 2.5 parts, defoamer 3 parts, US surface improver 2 parts, ABK promotor 5 parts;
Wherein said non-isocyanate polyurethane is synthesized by the component of following weight part:
Cyclic carbonate ester 35 parts, binary primary amine compound 62 parts, vinylformic acid reactive monomer 9 parts, E51 epoxy resin 6 parts, bismuth carboxylate 1 part.
Described binary primary amine compound is diphenyl-methyl methane diamines.
Described cyclic carbonate ester is terpenyl cyclic carbonate ester.
Described light trigger is 2-hydroxy-2-methyl-1-phenyl-1-acetone.
Preparation method is with embodiment 1.
Embodiment 4
The preferred embodiment of the present invention 4 provides a kind of UV coating standby based on the polyurethane of cyclic carbonate ester synthesis, same embodiment 3 of filling a prescription, and preparation method comprises following steps:
Step one: add a certain amount of epoxy resin, isocaprylic acid zinc and propylene carbonate in autoclave, epoxy resin, mass ratio between isocaprylic acid zinc and propylene carbonate are 5:2:1, are heated to 120 ~ 130 DEG C, pass into CO
2, make pressure remain between 1.3 ~ 1.6MPa, react 5 ~ 6 hours, product is poured out while hot, obtains cyclic carbonate ester through underpressure distillation purifying.
Step 2: cyclic carbonate ester and the E51 epoxy resin of getting respective amount mix in flask, add vinylformic acid reactive monomer and binary primary amine compound successively, control temperature reacts 2 ~ 3 hours between 80 ~ 90 DEG C, drip bismuth carboxylate in reaction process, after reaction terminates, obtain described non-isocyanate polyurethane.
Step 3: the magnetic field device producing magnetic field is set in the periphery of new reaction vessel, stir loading in new reaction vessel after the epoxy acrylate of respective amount and the mixing of vinylformic acid reactive monomer under the effect of externally-applied magnetic field, whipping temp 40 ~ 60 DEG C, stir 2 ~ 3 hours, then the non-isocyanate polyurethane of respective amount is added, tetramethylolmethane, light trigger, defoamer, stilbene biphenyl sodium disulfonate, ABK promotor, mix, add the monox nanometer particle and US surface improver that mix again, stirring is continued 3 hours after being warming up to 60 ~ 80 DEG C, be cooled to room temperature, obtain the described UV coating standby based on the polyurethane of cyclic carbonate ester synthesis.
Described magnetic field device is made up of iron core and coil, described iron core and coil encircling are around described reaction vessel, and described iron core is in the outside of described coil, the NS pole in described magnetic field is perpendicular to described reaction vessel, and the access of described magnetic field device is direct current.Wherein, magnetic induction density: 0.8-1.2 tesla.
The effect in the present embodiment magnetic field creates material impact to high molecular weight reactive, under additional the action of a magnetic field, obtained coating has better adhesive power and wear resistance, guess its reason may be in polymerization process under additional the action of a magnetic field, hydromagnetics effects that lorentz's force causes high molecular weight reactive, the impact of lorentz's force is subject to during the organic ion stream cutting magnetic line existed in solution, thus make its directed accelerated motion, and serve the effect of stirred solution in the process to a certain extent, make the regularity of final coating, physicalies etc. also can be improved due to the effect in magnetic field.
Embodiment 5 (comparative example)
Based on the UV coating that the polyurethane of cyclic carbonate ester synthesis is standby, formed by the Raw material processing of following weight part:
Epoxy acrylate 40 parts, isocyanate polyurethane 15 parts, light trigger 2.5 parts, defoamer 3 parts, US surface improver 2 parts, ABK promotor 5 parts;
Described light trigger is 2-hydroxy-2-methyl-1-phenyl-1-acetone.
Preparation method: epoxy acrylate, isocyanate polyurethane, 2-hydroxy-2-methyl-1-phenyl-1-acetone are mixed in proportion, and in the container of tape loaded agitator, are warming up to 40 DEG C, stirring velocity 400 revs/min, stir 1 hour; Add all the other raw materials, be warming up to 60 DEG C, stirring velocity 500 revs/min, stir 2 hours, be cooled to room temperature, obtain UV coating.
UV coating prepared in embodiment 1 to 5, its performance test results is in table 1.
Table 1
Wherein, wear resisting property adopts the test of Taber CS17 method, and load 1000g, rotates 2000 weeks, measures paint film weightlessness (i.e. wear(ing)value).For the test of xanthochromia grade, under the irradiation of natural light, evaluated by the xanthochromia grade of appearance method to paint film.
From table 1, UV coating prepared by the present invention has the advantage of environment-protecting asepsis, and its sticking power and wear resistance are all compared the existing coating being applied to external wall and had significant lifting, and it has stronger yellowing resistance.
Above-describedly be only the preferred embodiments of the present invention; be understood that; the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; the protection domain be not intended to limit the present invention; all any amendments, equivalent replacement etc. made within thought of the present invention and principle, all should be included within protection scope of the present invention.
Claims (7)
1., based on the UV coating that the polyurethane of cyclic carbonate ester synthesis is standby, it is characterized in that: formed by the Raw material processing of following weight part:
Epoxy acrylate 35 ~ 45 parts, non-isocyanate polyurethane 10 ~ 20 parts, vinylformic acid reactive monomer 20 ~ 25 parts, tetramethylolmethane 0.8 ~ 1.2 part, silicon oxide particle 6 ~ 8 parts, stilbene biphenyl sodium disulfonate 2 ~ 3 parts, light trigger 2 ~ 2.5 parts, defoamer 2.5 ~ 3.5 parts, US surface improver 1.5 ~ 2.5 parts, ABK promotor 4 ~ 8 parts;
Wherein said non-isocyanate polyurethane is synthesized by the component of following weight part:
Cyclic carbonate ester 30 ~ 35 parts, binary primary amine compound 60 ~ 65 parts, Acrylic Acid Monomer 8 ~ 10 parts, E51 epoxy resin 5 ~ 6 parts, bismuth carboxylate 1 ~ 2 part.
2. UV coating according to claim 1, is characterized in that: described binary primary amine compound is diphenyl-methyl methane diamines.
3. UV coating according to claim 1, is characterized in that: described cyclic carbonate ester terpenyl cyclic carbonate ester.
4. prepare a preparation method for UV coating standby based on the polyurethane of cyclic carbonate ester synthesis as claimed in claim 1, it is characterized in that comprising the steps:
Step one: add a certain amount of epoxy resin, isocaprylic acid zinc and propylene carbonate in autoclave, epoxy resin, mass ratio between isocaprylic acid zinc and propylene carbonate are 5:2:1, are heated to 120 ~ 130 DEG C, pass into CO
2, make pressure remain between 1.3 ~ 1.6MPa, react 5 ~ 6 hours, product is poured out while hot, obtains cyclic carbonate ester through underpressure distillation purifying.
Step 2: cyclic carbonate ester and the E51 epoxy resin of getting respective amount mix in flask, add Acrylic Acid Monomer and binary primary amine compound successively, control temperature reacts 2 ~ 3 hours between 80 ~ 90 DEG C, drip bismuth carboxylate in reaction process, after reaction terminates, obtain described non-isocyanate polyurethane.
Step 3: stir loading in container after the epoxy acrylate of respective amount and the mixing of vinylformic acid reactive monomer, whipping temp 40 ~ 60 DEG C, stir 2 ~ 3 hours, then the non-isocyanate polyurethane of respective amount, tetramethylolmethane, light trigger, defoamer, stilbene biphenyl sodium disulfonate, ABK promotor is added, mix, add the monox nanometer particle and US surface improver that mix again, stirring is continued 3 hours after being warming up to 60 ~ 80 DEG C, be cooled to room temperature, obtain the described UV coating standby based on the polyurethane of cyclic carbonate ester synthesis.
5. the preparation method of a kind of UV coating standby based on the polyurethane of cyclic carbonate ester synthesis according to claim 4, it is characterized in that: described step 3 loads in reaction vessel before stirring after by the epoxy acrylate of respective amount and the mixing of vinylformic acid reactive monomer, first arranges the magnetic field device producing magnetic field in the periphery of its reaction vessel.
6. the preparation method of a kind of UV coating standby based on the polyurethane of cyclic carbonate ester synthesis according to claim 5, it is characterized in that: described magnetic field device is made up of iron core and coil, described iron core and coil encircling are around described reaction vessel, and described iron core is in the outside of described coil, the NS pole in described magnetic field is perpendicular to described reaction vessel, and the access of described magnetic field device is direct current.
7. the preparation method of a kind of UV coating standby based on the polyurethane of cyclic carbonate ester synthesis according to claim 6, is characterized in that: the magnetic induction density of externally-applied magnetic field is 0.8-1.2 tesla.
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