CN112080185A - Waterborne polyurethane industrial paint and preparation method thereof - Google Patents
Waterborne polyurethane industrial paint and preparation method thereof Download PDFInfo
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- CN112080185A CN112080185A CN202011049262.9A CN202011049262A CN112080185A CN 112080185 A CN112080185 A CN 112080185A CN 202011049262 A CN202011049262 A CN 202011049262A CN 112080185 A CN112080185 A CN 112080185A
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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
- C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
- C09D151/08—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/006—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polymers provided for in C08G18/00
- C08F283/008—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polymers provided for in C08G18/00 on to unsaturated polymers
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1656—Antifouling paints; Underwater paints characterised by the film-forming substance
- C09D5/1662—Synthetic film-forming substance
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Abstract
The invention discloses an aqueous polyurethane industrial paint and a preparation method thereof, and particularly relates to the technical field of polyurethane coatings, wherein the preparation raw materials comprise the following components in parts by weight: 5-8 parts of polyether glycol, 3-5 parts of castor oil, 8-15 parts of isophorone diisocyanate, 10-15 parts of dibutyltin dilaurate, 0.5-1.5 parts of 1, 4-butanediol, 1-3 parts of dimethylolpropionic acid, 2-4 parts of epoxy resin, 1-2 parts of trimethylolpropane, 25-40 parts of methyl methacrylate, 1-2 parts of triethylamine, 1-2 parts of ethylenediamine, 0.8-1.2 parts of photoinitiator, 0.5-1 part of film-forming assistant, 0.3-0.6 part of flatting agent, 0.3-0.8 part of thickener, a proper amount of external cross-linking agent, a proper amount of di-n-butylamine and a sufficient amount of dry nitrogen, and the production is carried out through prepolymerization → emulsification → emulsion modification → paint mixing flow. The aqueous polyurethane industrial paint has the advantages of strong storage stability, difficult breakage of a formed paint film, strong water resistance and strong pollution resistance.
Description
Technical Field
The invention relates to the technical field of polyurethane coatings, in particular to an aqueous polyurethane industrial paint and a preparation method thereof.
Background
Polyurethane (PU for short) is a polymer prepared from raw materials such as polyisocyanate and polyether polyol or polyester polyol or/and chain extenders or cross-linking agents such as micromolecular polyol, polyamine or water. By changing the types and compositions of the raw materials, the product form and the performance can be greatly changed, and a final product from soft to hard can be obtained, and the application is wide. The polyurethane paint is a common paint, has tough paint film, plump luster, strong adhesive force, water resistance, wear resistance and corrosion resistance, can be used as finish paint for high-grade wood furniture or antirust paint for metal surfaces, and is widely applied to various fields of wood, automobiles, airplanes, machinery, electrical appliances, instruments and meters, plastics, leather, paper, fabrics, petrochemical industry and the like. However, it is a water-insoluble oily polymer, and therefore, it cannot be used in combination with hydrophilic materials, and has problems of foaming in the presence of moisture, powdering of paint film, or yellowing. On the other hand, the solvent-based coating widely used at present contains a large amount of Volatile Organic Compounds (VOC), which are toxic, flammable, pollute the atmosphere and cause harm to the environment and human body. Therefore, there is a necessary trend to reduce the emission of Volatile Organic Compounds (VOC), protect the ecological environment, reduce the greenhouse effect, and vigorously develop low-pollution paint products. With the continuous progress of society, the environmental protection consciousness of the people is continuously improved, and the water-based paint is listed in the development direction in the future. In the industrial paint market for trial application, the water-based industrial paints mainly include alkyd water-based paints, single-component polyurethane water-based paints, acrylic water-based paints, epoxy water-based industrial paints, and the like. The alkyd water paint has good brightness, low hardness and poor corrosion resistance; the single-component polyurethane water paint has good flexibility, low hardness and higher cost; the acrylic acid water-based paint has good hardness, but poor toughness and poor adhesion; the epoxy water-based industrial paint has good corrosion resistance, but poor surface effect and poor decoration. Therefore, most of the existing water-based industrial paints on the market have certain defects.
Such as the existing water-based polyurethane industrial paint on the market, but when the paint is actually used, the paint still has more defects, such as poor storage stability, easy breakage of a formed paint film at low temperature, poor water resistance and poor pollution resistance.
The above information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
In order to overcome the above defects in the prior art, the embodiment of the invention provides an aqueous polyurethane industrial paint and a preparation method thereof, aiming at solving the following technical problems: to improve the storage stability, low-temperature toughness, water resistance and stain resistance of the formed paint film of the aqueous polyurethane industrial paint.
In order to achieve the purpose, the invention provides the following technical scheme: the waterborne polyurethane industrial paint comprises the following raw materials in parts by weight: 5-8 parts of polyether glycol, 3-5 parts of castor oil, 8-15 parts of isophorone diisocyanate, 10-15 parts of dibutyltin dilaurate, 0.5-1.5 parts of 1, 4-butanediol, 1-3 parts of dimethylolpropionic acid, 2-4 parts of epoxy resin, 1-2 parts of trimethylolpropane, 25-40 parts of methyl methacrylate, 1-2 parts of triethylamine, 1-2 parts of ethylenediamine, 0.8-1.2 parts of photoinitiator, 0.5-1 part of film-forming assistant, 0.3-0.6 part of flatting agent, 0.3-0.8 part of thickening agent, a proper amount of external cross-linking agent, a proper amount of di-n-butylamine and a sufficient amount of dry nitrogen.
In a preferred embodiment, the polyether glycol, castor oil, isophorone diisocyanate, and dibutyltin dilaurate described above are all subjected to a dehydration treatment.
In a preferred embodiment, the triethylamine and ethylenediamine are dried by 4A molecular sieve before use.
In a preferred embodiment, the external crosslinker is an aziridine.
The invention also provides a preparation method of the waterborne polyurethane industrial paint, which comprises the following operation steps:
the method comprises the following steps: pre-polymerization: under the protection of dry nitrogen, adding dehydrated polyether glycol, castor oil, isophorone diisocyanate and dibutyltin dilaurate into a container provided with a thermometer, a stirring device and a reflux condenser, measuring the isocyanate group value of a system to be close to a theoretical value by a di-n-butylamine titration method, then dropwise adding 1, 4-butanediol, preserving heat for 1h, adding dimethylolpropionic acid, epoxy resin and trimethylolpropane after the isocyanate group reaches the theoretical value, reacting until the isocyanate group reaches a specified value, and then cooling and adding methyl methacrylate to obtain a polyurethane/methyl methacrylate prepolymer;
step two: emulsification:
(3) and (3) emulsification at normal temperature: neutralizing the prepolymer in the step one with triethylamine, emulsifying in normal-temperature water, and then chain extending with ethylenediamine to obtain polyurethane/methyl methacrylate emulsion A;
(4) emulsification with warm water: neutralizing the prepolymer in the step one with triethylamine, emulsifying in warm water at 45 ℃, and then chain extending with ethylenediamine to obtain polyurethane/methyl methacrylate emulsion B;
step three: and (3) emulsion modification treatment: mixing the emulsion A and the emulsion B in the step two, heating to 70-75 ℃, uniformly dropwise adding an initiator solution within 3h, keeping the temperature for 1-2h after dropwise adding is finished, testing the conversion rate of methyl methacrylate until the conversion rate is unchanged, then cooling, discharging, and filtering by using a 200-mesh screen to obtain a filtrate, namely the modified polyurethane emulsion;
step four: preparing paint: stirring the modified polyurethane emulsion in the third step at a certain rotating speed, then sequentially adding the film-forming aid, the leveling agent and the external crosslinking agent, then adding the thickening agent to adjust the viscosity to a proper value, and uniformly stirring to obtain the varnish, namely the target product.
In a preferred embodiment, in the third step, the ratio of the amount of emulsion A to the amount of emulsion B is 2: 3.
In a preferred embodiment, in the fourth step, the amount of the external crosslinking agent is 3-5% of the amount of the modified polyurethane.
The invention has the technical effects and advantages that:
the aqueous polyurethane industrial paint prepared by the preparation method and the raw material formula has the advantages that under the same conditions, the storage stability, the low-temperature toughness, the water resistance and the pollution resistance of the formed paint film are obviously superior to those of the existing aqueous polyurethane industrial paint on the market, the curing time of the aqueous industrial paint is short, the formed paint film is fine and smooth, and the aqueous industrial paint is suitable for popularization and use.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more example embodiments. In the following description, numerous specific details are provided to give a thorough understanding of example embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, steps, and so forth. In other instances, well-known structures, methods, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
Example 1
The invention provides an aqueous polyurethane industrial paint, which comprises the following components in parts by weight: 5 parts of polyether glycol, 3 parts of castor oil, 8 parts of isophorone diisocyanate (IPDI), 10 parts of dibutyltin dilaurate (DBTDL), 0.5 part of 1, 4-Butanediol (BDO), 1 part of dimethylolpropionic acid (DMPA), 2 parts of epoxy resin, 1 part of Trimethylolpropane (TMP), 25 parts of Methyl Methacrylate (MMA), 1 part of triethylamine, 1 part of ethylenediamine, 0.8 part of photoinitiator, 0.5 part of film-forming assistant, 0.3 part of flatting agent, 0.3 part of thickening agent, a proper amount of external crosslinking agent, a proper amount of di-n-butylamine and a sufficient amount of dry nitrogen.
Further, the polyether glycol, the castor oil, the isophorone diisocyanate and the dibutyltin dilaurate are dehydrated.
Furthermore, the triethylamine and the ethylenediamine are dried by a 4A molecular sieve before use.
Further, the external crosslinking agent is aziridine.
The invention also provides a preparation method of the waterborne polyurethane industrial paint, which comprises the following operation steps:
the method comprises the following steps: pre-polymerization: under the protection of dry nitrogen, adding dehydrated polyether glycol, castor oil, isophorone diisocyanate (IPDI) and dibutyltin dilaurate (DBTDL) into a container provided with a thermometer, a stirring device and a reflux condenser, measuring the isocyanate group (-NCO) value of a system to be close to a theoretical value by a di-n-butylamine titration method, then dropwise adding 1, 4-Butanediol (BDO), preserving heat for 1h, adding dimethylolpropionic acid (DMPA), epoxy resin and Trimethylolpropane (TMP) after the isocyanate group (-NCO) reaches the theoretical value, reacting until the isocyanate group (-NCO) reaches a specified value, and then cooling and adding Methyl Methacrylate (MMA) to obtain a polyurethane/methyl methacrylate (PU/MMA) prepolymer;
step two: emulsification:
(5) and (3) emulsification at normal temperature: neutralizing the prepolymer in the step one with triethylamine, emulsifying in normal-temperature water, and then chain extending with ethylenediamine to obtain polyurethane/methyl methacrylate (PU/MMA) emulsion A;
(6) emulsification with warm water: neutralizing the prepolymer in the step one with triethylamine, emulsifying in warm water at 45 ℃, and then using ethylenediamine for chain extension to obtain polyurethane/methyl methacrylate (PU/MMA) emulsion B;
step three: and (3) emulsion modification treatment: mixing the emulsion A and the emulsion B in the step two according to a ratio of 2:3, heating to 70-75 ℃, uniformly dropwise adding an initiator solution within 3h, keeping the temperature for 1-2h after dropwise adding is finished, testing the conversion rate of Methyl Methacrylate (MMA) until the conversion rate is unchanged, then cooling, discharging, and filtering by using a 200-mesh screen, wherein the obtained filtrate is the modified Polyurethane (PUA) emulsion;
step four: preparing paint: stirring the modified Polyurethane (PUA) emulsion in the third step at a certain rotating speed, then sequentially adding the film-forming assistant, the leveling agent and the external cross-linking agent with the amount of 3-5% of the modified Polyurethane (PUA), adding the thickening agent to adjust the viscosity to a proper value, and uniformly stirring to obtain the varnish, namely the target product.
Example 2
The invention provides an aqueous polyurethane industrial paint, which comprises the following components in parts by weight: 7 parts of polyether glycol, 4 parts of castor oil, 12 parts of isophorone diisocyanate (IPDI), 12 parts of dibutyltin dilaurate (DBTDL), 1 part of 1, 4-Butanediol (BDO), 2 parts of dimethylolpropionic acid (DMPA), 3 parts of epoxy resin, 1.6 parts of Trimethylolpropane (TMP), 34 parts of Methyl Methacrylate (MMA), 1.5 parts of triethylamine, 1.5 parts of ethylenediamine, 1 part of photoinitiator, 0.8 part of film-forming assistant, 0.4 part of leveling agent, 0.5 part of thickening agent, a proper amount of external crosslinking agent, a proper amount of di-n-butylamine and a sufficient amount of dry nitrogen.
Further, the polyether glycol, the castor oil, the isophorone diisocyanate and the dibutyltin dilaurate are dehydrated.
Furthermore, the triethylamine and the ethylenediamine are dried by a 4A molecular sieve before use.
Further, the external crosslinking agent is aziridine.
The invention also provides a preparation method of the waterborne polyurethane industrial paint, which comprises the following operation steps:
the method comprises the following steps: pre-polymerization: under the protection of dry nitrogen, adding dehydrated polyether glycol, castor oil, isophorone diisocyanate (IPDI) and dibutyltin dilaurate (DBTDL) into a container provided with a thermometer, a stirring device and a reflux condenser, measuring the isocyanate group (-NCO) value of a system to be close to a theoretical value by a di-n-butylamine titration method, then dropwise adding 1, 4-Butanediol (BDO), preserving heat for 1h, adding dimethylolpropionic acid (DMPA), epoxy resin and Trimethylolpropane (TMP) after the isocyanate group (-NCO) reaches the theoretical value, reacting until the isocyanate group (-NCO) reaches a specified value, and then cooling and adding Methyl Methacrylate (MMA) to obtain a polyurethane/methyl methacrylate (PU/MMA) prepolymer;
step two: emulsification:
(7) and (3) emulsification at normal temperature: neutralizing the prepolymer in the step one with triethylamine, emulsifying in normal-temperature water, and then chain extending with ethylenediamine to obtain polyurethane/methyl methacrylate (PU/MMA) emulsion A;
(8) emulsification with warm water: neutralizing the prepolymer in the step one with triethylamine, emulsifying in warm water at 45 ℃, and then using ethylenediamine for chain extension to obtain polyurethane/methyl methacrylate (PU/MMA) emulsion B;
step three: and (3) emulsion modification treatment: mixing the emulsion A and the emulsion B in the step two according to a ratio of 2:3, heating to 70-75 ℃, uniformly dropwise adding an initiator solution within 3h, keeping the temperature for 1-2h after dropwise adding is finished, testing the conversion rate of Methyl Methacrylate (MMA) until the conversion rate is unchanged, then cooling, discharging, and filtering by using a 200-mesh screen, wherein the obtained filtrate is the modified Polyurethane (PUA) emulsion;
step four: preparing paint: stirring the modified Polyurethane (PUA) emulsion in the third step at a certain rotating speed, then sequentially adding the film-forming assistant, the leveling agent and the external cross-linking agent with the amount of 3-5% of the modified Polyurethane (PUA), adding the thickening agent to adjust the viscosity to a proper value, and uniformly stirring to obtain the varnish, namely the target product.
Example 3
The invention provides an aqueous polyurethane industrial paint, which comprises the following components in parts by weight: 8 parts of polyether glycol, 5 parts of castor oil, 15 parts of isophorone diisocyanate (IPDI), 15 parts of dibutyltin dilaurate (DBTDL), 1.5 parts of 1, 4-Butanediol (BDO), 3 parts of dimethylolpropionic acid (DMPA), 4 parts of epoxy resin, 2 parts of Trimethylolpropane (TMP), 40 parts of Methyl Methacrylate (MMA), 2 parts of triethylamine, 2 parts of ethylenediamine, 1.2 parts of a photoinitiator, 1 part of a film-forming aid, 0.6 part of a leveling agent, 0.8 part of a thickening agent, a proper amount of an external crosslinking agent, a proper amount of di-n-butylamine and a sufficient amount of dry nitrogen.
Further, the polyether glycol, the castor oil, the isophorone diisocyanate and the dibutyltin dilaurate are dehydrated.
Furthermore, the triethylamine and the ethylenediamine are dried by a 4A molecular sieve before use.
Further, the external crosslinking agent is aziridine.
The invention also provides a preparation method of the waterborne polyurethane industrial paint, which comprises the following operation steps:
the method comprises the following steps: pre-polymerization: under the protection of dry nitrogen, adding dehydrated polyether glycol, castor oil, isophorone diisocyanate (IPDI) and dibutyltin dilaurate (DBTDL) into a container provided with a thermometer, a stirring device and a reflux condenser, measuring the isocyanate group (-NCO) value of a system to be close to a theoretical value by a di-n-butylamine titration method, then dropwise adding 1, 4-Butanediol (BDO), preserving heat for 1h, adding dimethylolpropionic acid (DMPA), epoxy resin and Trimethylolpropane (TMP) after the isocyanate group (-NCO) reaches the theoretical value, reacting until the isocyanate group (-NCO) reaches a specified value, and then cooling and adding Methyl Methacrylate (MMA) to obtain a polyurethane/methyl methacrylate (PU/MMA) prepolymer;
step two: emulsification:
(9) and (3) emulsification at normal temperature: neutralizing the prepolymer in the step one with triethylamine, emulsifying in normal-temperature water, and then chain extending with ethylenediamine to obtain polyurethane/methyl methacrylate (PU/MMA) emulsion A;
(10) emulsification with warm water: neutralizing the prepolymer in the step one with triethylamine, emulsifying in warm water at 45 ℃, and then using ethylenediamine for chain extension to obtain polyurethane/methyl methacrylate (PU/MMA) emulsion B;
step three: and (3) emulsion modification treatment: mixing the emulsion A and the emulsion B in the step two according to a ratio of 2:3, heating to 70-75 ℃, uniformly dropwise adding an initiator solution within 3h, keeping the temperature for 1-2h after dropwise adding is finished, testing the conversion rate of Methyl Methacrylate (MMA) until the conversion rate is unchanged, then cooling, discharging, and filtering by using a 200-mesh screen, wherein the obtained filtrate is the modified Polyurethane (PUA) emulsion;
step four: preparing paint: stirring the modified Polyurethane (PUA) emulsion in the third step at a certain rotating speed, then sequentially adding the film-forming assistant, the leveling agent and the external cross-linking agent with the amount of 3-5% of the modified Polyurethane (PUA), adding the thickening agent to adjust the viscosity to a proper value, and uniformly stirring to obtain the varnish, namely the target product.
Comparative examples 1 to 3, the storage stability, low-temperature toughness, water resistance, stain resistance and photocuring time of the resulting aqueous polyurethane industrial paints were compared and compared with those of the prior art aqueous polyurethane industrial paints, see in particular the following tables:
in the above table:
(1) the method for testing the photocuring time comprises the following steps: coating the water-based industrial paint on a base surface, irradiating the base surface in an ultraviolet environment, and measuring the film forming time;
(2) the method for testing the storage stability of the industrial paint comprises the following steps: placing part of the water-based industrial paint in a glass container or a plastic container, reserving 10% of space, sealing, placing in a constant-temperature drying oven at 50 ℃ for 7 days, taking out, and then placing at normal temperature (25 ℃) for 3 hours to see whether the water-based industrial paint is uniformly stirred without hard lumps or not;
(3) the method for testing the low-temperature toughness of the paint film comprises the following steps: coating the water-based industrial paint on a polypropylene film at room temperature, drying for 7 days, tearing off the polypropylene film, treating at-20 ℃ for 24 hours, and folding the paint film at-20 ℃ left and right to see whether the paint film has the phenomena of fracture, deformation, color loss, wrinkling and the like;
(4) the method for testing the stain resistance of the paint film comprises the following steps: covering a layer of pure black ink on the surface of the test board coated with the water-based industrial paint, standing for 5 hours at normal temperature, and observing whether ink stains which cannot be removed remain on the surface of a coating film;
(5) the method for testing the water resistance of the paint film comprises the following steps: attaching filter paper wetted by distilled water to the surface of a test board coated with the water-based industrial paint, removing the filter paper after 72h (the filter paper is always kept in a wetted state), standing for 2h, and observing the test board in sunlight to see whether the test board has the coating ill-conditioned phenomena such as foaming, cracking, peeling and the like;
according to the comparison of data in the table, the following results are obtained: the aqueous polyurethane industrial paint prepared by the preparation method and the raw material formula has the advantages of obviously superior storage stability, low-temperature toughness of a formed paint film, water resistance and pollution resistance to the existing aqueous polyurethane industrial paint on the market, short curing time and suitability for popularization and application.
Finally, it should be noted that: although the present invention has been described in detail with reference to the general description and the specific embodiments, on the basis of the present invention, the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. An aqueous polyurethane industrial paint is characterized in that: the preparation raw materials comprise the following components in parts by weight: 5-8 parts of polyether glycol, 3-5 parts of castor oil, 8-15 parts of isophorone diisocyanate, 10-15 parts of dibutyltin dilaurate, 0.5-1.5 parts of 1, 4-butanediol, 1-3 parts of dimethylolpropionic acid, 2-4 parts of epoxy resin, 1-2 parts of trimethylolpropane, 25-40 parts of methyl methacrylate, 1-2 parts of triethylamine, 1-2 parts of ethylenediamine, 0.8-1.2 parts of photoinitiator, 0.5-1 part of film-forming assistant, 0.3-0.6 part of flatting agent, 0.3-0.8 part of thickening agent, a proper amount of external cross-linking agent, a proper amount of di-n-butylamine and a sufficient amount of dry nitrogen.
2. The aqueous polyurethane industrial paint according to claim 1, characterized in that: the polyether glycol, castor oil, isophorone diisocyanate and dibutyltin dilaurate all need to be dehydrated.
3. The aqueous polyurethane industrial paint according to claim 1, characterized in that: the triethylamine and the ethylenediamine are dried by a 4A molecular sieve before use.
4. The aqueous polyurethane industrial paint according to claim 1, characterized in that: the external crosslinker is aziridine.
5. A method for preparing an aqueous polyurethane industrial paint according to any one of claims 1 to 4, characterized in that: the method specifically comprises the following operation steps:
the method comprises the following steps: pre-polymerization: under the protection of dry nitrogen, adding dehydrated polyether glycol, castor oil, isophorone diisocyanate and dibutyltin dilaurate into a container provided with a thermometer, a stirring device and a reflux condenser, measuring the isocyanate group value of a system to be close to a theoretical value by a di-n-butylamine titration method, then dropwise adding 1, 4-butanediol, preserving heat for 1h, adding dimethylolpropionic acid, epoxy resin and trimethylolpropane after the isocyanate group reaches the theoretical value, reacting until the isocyanate group reaches a specified value, and then cooling and adding methyl methacrylate to obtain a polyurethane/methyl methacrylate prepolymer;
step two: emulsification:
(1) and (3) emulsification at normal temperature: neutralizing the prepolymer in the step one with triethylamine, emulsifying in normal-temperature water, and then chain extending with ethylenediamine to obtain polyurethane/methyl methacrylate emulsion A;
(2) emulsification with warm water: neutralizing the prepolymer in the step one with triethylamine, emulsifying in warm water at 45 ℃, and then chain extending with ethylenediamine to obtain polyurethane/methyl methacrylate emulsion B;
step three: and (3) emulsion modification treatment: mixing the emulsion A and the emulsion B in the step two, heating to 70-75 ℃, uniformly dropwise adding an initiator solution within 3h, keeping the temperature for 1-2h after dropwise adding is finished, testing the conversion rate of methyl methacrylate until the conversion rate is unchanged, then cooling, discharging, and filtering by using a 200-mesh screen to obtain a filtrate, namely the modified polyurethane emulsion;
step four: preparing paint: stirring the modified polyurethane emulsion in the third step at a certain rotating speed, then sequentially adding the film-forming aid, the leveling agent and the external crosslinking agent, then adding the thickening agent to adjust the viscosity to a proper value, and uniformly stirring to obtain the varnish, namely the target product.
6. The preparation method of the aqueous polyurethane industrial paint according to claim 5, characterized in that: in the third step, the dosage ratio of the emulsion A to the emulsion B is 2: 3.
7. The preparation method of the aqueous polyurethane industrial paint according to claim 5, characterized in that: in the fourth step, the dosage of the external cross-linking agent is 3-5% of the dosage of the modified polyurethane.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112724338A (en) * | 2020-12-24 | 2021-04-30 | 浩力森涂料（上海）有限公司 | Castor oil modified emulsion for improving directionality of silver powder of water-based silver powder coating and preparation method of castor oil modified emulsion |
| CN113122102A (en) * | 2021-05-27 | 2021-07-16 | 临海市国盛泰工艺品股份有限公司 | Low-pollution high-flatness spray paint and spray paint process thereof |
| CN115636951A (en) * | 2022-10-12 | 2023-01-24 | 安徽衡光新材料科技有限公司 | Modified water-based single-component epoxy emulsion, self-drying epoxy primer and preparation method thereof |
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| CN112724338A (en) * | 2020-12-24 | 2021-04-30 | 浩力森涂料（上海）有限公司 | Castor oil modified emulsion for improving directionality of silver powder of water-based silver powder coating and preparation method of castor oil modified emulsion |
| CN112724338B (en) * | 2020-12-24 | 2022-08-12 | 浩力森涂料（上海）有限公司 | Castor oil modified emulsion for improving directionality of silver powder of water-based silver powder coating and preparation method of castor oil modified emulsion |
| CN113122102A (en) * | 2021-05-27 | 2021-07-16 | 临海市国盛泰工艺品股份有限公司 | Low-pollution high-flatness spray paint and spray paint process thereof |
| CN113122102B (en) * | 2021-05-27 | 2021-12-17 | 临海市国盛泰工艺品股份有限公司 | Low-pollution high-flatness spray paint and spray paint process thereof |
| CN115636951A (en) * | 2022-10-12 | 2023-01-24 | 安徽衡光新材料科技有限公司 | Modified water-based single-component epoxy emulsion, self-drying epoxy primer and preparation method thereof |
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Application publication date: 20201215 |