CN116496683A - Preparation method of water-based UV (ultraviolet) coating - Google Patents
Preparation method of water-based UV (ultraviolet) coating Download PDFInfo
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- CN116496683A CN116496683A CN202310225408.8A CN202310225408A CN116496683A CN 116496683 A CN116496683 A CN 116496683A CN 202310225408 A CN202310225408 A CN 202310225408A CN 116496683 A CN116496683 A CN 116496683A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000011248 coating agent Substances 0.000 title claims abstract description 23
- 238000000576 coating method Methods 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 72
- 239000000839 emulsion Substances 0.000 claims abstract description 66
- 240000000491 Corchorus aestuans Species 0.000 claims abstract description 47
- 235000011777 Corchorus aestuans Nutrition 0.000 claims abstract description 47
- 235000010862 Corchorus capsularis Nutrition 0.000 claims abstract description 47
- 239000000835 fiber Substances 0.000 claims abstract description 47
- HDERJYVLTPVNRI-UHFFFAOYSA-N ethene;ethenyl acetate Chemical group C=C.CC(=O)OC=C HDERJYVLTPVNRI-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229920001038 ethylene copolymer Polymers 0.000 claims abstract description 26
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 229920002635 polyurethane Polymers 0.000 claims abstract description 24
- 239000004814 polyurethane Substances 0.000 claims abstract description 24
- 238000010008 shearing Methods 0.000 claims abstract description 20
- 239000003973 paint Substances 0.000 claims abstract description 15
- 238000001694 spray drying Methods 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 238000005406 washing Methods 0.000 claims description 82
- 239000007788 liquid Substances 0.000 claims description 34
- 239000008367 deionised water Substances 0.000 claims description 33
- 229910021641 deionized water Inorganic materials 0.000 claims description 33
- 239000000706 filtrate Substances 0.000 claims description 32
- 239000000243 solution Substances 0.000 claims description 30
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 238000000926 separation method Methods 0.000 claims description 22
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 15
- 239000006185 dispersion Substances 0.000 claims description 14
- 238000005086 pumping Methods 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 239000002270 dispersing agent Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 239000000080 wetting agent Substances 0.000 claims description 12
- 239000006254 rheological additive Substances 0.000 claims description 11
- 239000007853 buffer solution Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 230000007935 neutral effect Effects 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000002518 antifoaming agent Substances 0.000 claims description 7
- 238000009210 therapy by ultrasound Methods 0.000 claims description 7
- 239000013530 defoamer Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 238000000889 atomisation Methods 0.000 claims description 2
- 239000011347 resin Substances 0.000 abstract description 3
- 229920005989 resin Polymers 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 239000001257 hydrogen Substances 0.000 abstract description 2
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 2
- 238000007781 pre-processing Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 23
- 239000012752 auxiliary agent Substances 0.000 description 13
- 239000007787 solid Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
Classifications
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
- B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
Abstract
The invention provides a preparation method of a water-based UV paint. The preparation method of the water-based UV paint comprises the following steps: selecting raw materials, oscillating and blending, preprocessing jute fiber, spray drying, stirring and dispersing, shearing and dispersing and adjusting viscosity. According to the invention, the aqueous ultraviolet light curing polyurethane emulsion and the vinyl acetate-ethylene copolymer emulsion are blended, more hydrogen bonds are formed between the aqueous ultraviolet light curing polyurethane and the vinyl acetate-ethylene copolymer, the water resistance of the finally prepared aqueous UV coating is improved, and the jute fiber is added into the aqueous UV coating, so that the surface of the jute fiber has more hydroxyl groups, the compatibility of the vinyl acetate-ethylene copolymer emulsion with the aqueous ultraviolet light curing resin emulsion can be improved, the molecular gap of the aqueous UV coating after film formation is reduced, and the water resistance of the aqueous UV coating is improved.
Description
Technical Field
The invention belongs to the technical field of water-based paint, and particularly relates to a preparation method of a water-based UV paint.
Background
The water-based UV paint, namely the water-based ultraviolet light curing paint, is formed by compounding water-based light curing resin, a photoinitiator, pigment and filler and various auxiliary agents, is simple in construction, safe in use and wide in application, can completely replace oily UV paint in many fields, but has the problem of poor water resistance, so that the water-based UV paint is limited in use.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a preparation method of water-based UV.
A preparation method of a water-based UV coating comprises the following steps:
s1: selecting raw materials
75-80 parts of aqueous ultraviolet curing polyurethane emulsion, 15-25 parts of vinyl acetate-ethylene copolymer emulsion, 4-6 parts of jute fiber, 15-25 parts of deionized water, 0.1-0.4 part of wetting agent, 0.1-0.5 part of flatting agent, 0.2-0.4 part of defoamer, 1.5-2 parts of photoinitiator, 0.1-0.3 part of dispersing agent and 0.5-0.8 part of rheological additive are selected for standby;
s2: oscillating blending
Mixing vinyl acetate-ethylene copolymer emulsion and deionized water in an oscillating way, and adding aqueous ultraviolet curing polyurethane aqueous emulsion for blending to obtain blended emulsion;
s3: pretreatment of jute fiber
Crushing jute fibers, washing with deionized water, removing filtrate to obtain filter residue A, adding the filter residue A into NaOH solution, stirring at normal temperature, putting into a washing tank, washing with deionized water until the filtrate is neutral, removing filtrate to obtain filter residue B, washing the filter residue B with absolute ethyl alcohol, and removing filtrate to obtain filter residue C;
s4: spray drying
Adding absolute ethyl alcohol into a washing tank, uniformly mixing the absolute ethyl alcohol with filter residues C to obtain a washing solution, atomizing the washing solution by an atomizer at the upper part of the washing tank, spraying the washing solution into an atomizing tank, simultaneously pumping hot air at 110-130 ℃ into the atomizing tank, and performing spray drying to obtain jute fiber crushed particles;
s5: stirring dispersion and shearing dispersion
Stirring and dispersing the blending emulsion, deionized water, a wetting agent, a leveling agent, a defoaming agent, a dispersing agent, a photoinitiator and jute fiber crushed particles, and then shearing and dispersing to obtain an intermediate;
s6: viscosity adjustment
And adding an rheological additive into the intermediate to adjust the viscosity to the target viscosity, so as to obtain the water-based UV coating.
Further, the oscillating blending in the step S2 specifically includes the following steps:
s2.1: adding the vinyl acetate-ethylene copolymer emulsion into a full-temperature oscillator, adding deionized water to prepare emulsion with the mass fraction of 4-6%, and oscillating for 1-2h at 50-60 ℃;
s2.2: a liquid storage valve in the full-temperature oscillator is opened, the aqueous ultraviolet curing polyurethane emulsion in the liquid storage device flows into the full-temperature oscillator through a liquid storage pipe, the mass of the aqueous ultraviolet curing polyurethane aqueous solution flowing out is 3.5-4.5 times of that of the vinyl acetate-ethylene copolymer emulsion detected by an electromagnetic flowmeter in the liquid storage pipe, and the liquid storage valve is closed and continuously oscillated for 1-2 hours;
s2.3: and (3) performing ultrasonic treatment by an ultrasonic generator in the full-temperature oscillator, and oscillating for 2-3 hours to obtain the blending emulsion.
Further, the pretreatment of jute fiber in the step S3 specifically includes the following steps:
s3.1: crushing jute fibers by using a crusher, putting the crushed jute fibers into a reaction box, adding deionized water, pumping hot air at 60-70 ℃ into the reaction box, filtering again, removing filtrate to obtain filter residue A, adding the filter residue A into NaOH solution, and stirring for 22-25 hours to obtain buffer solution;
s3.2: adding buffer solution and deionized water into the upper layer of a washing box, opening a washing valve at the lower side of a filter screen in the washing box, starting to filter, enabling filtrate to fall on a separation valve below the filter screen, detecting that the filtrate is not neutral by a pH detector in the middle of the washing box, opening the separation valve, enabling the filtrate to fall into the lower layer of the washing box, closing the separation valve and the washing valve, repeating the washing and filtering actions until the pH detector detects that the filtrate is neutral, opening the separation valve, enabling the filtrate to fall into the lower layer of the washing box, and closing the separation valve and the washing valve to obtain filter residues B;
s3.3: and adding absolute ethyl alcohol into a washing box, washing and filtering for 2-4 times to obtain filter residue C.
Further, after the spray drying in the step S4 is completed, the hot air in the atomization tank is pumped into the gas storage tank by the drying air pump through the guide pipe, the temperature detector in the gas storage tank detects the temperature of the hot air, the temperature of the hot air is detected to be not 60-70 ℃, the temperature of the heat insulation board outside the gas storage tank is raised or lowered, the temperature of the air in the gas storage tank is maintained to be 60-70 ℃, and when the hot air is required to be introduced in the step S3.1, the hot air in the gas storage tank is pumped into the reaction tank from the gas storage tank by the heating air pump.
Further, the stirring dispersion and shearing dispersion in the step S5 specifically include the following steps:
placing the blending emulsion into a stirring and dispersing machine, stirring at a stirring speed of 500-600r/min, adding deionized water, a wetting agent, a leveling agent, a defoaming agent and a dispersing agent into the stirring and dispersing machine under stirring, then increasing the stirring speed to 1000-1200r/min, stirring for 10-25min, adding a photoinitiator and jute fiber crushed particles, reducing the stirring speed to 200-400r/min, and obtaining a mixed material after 5-10min, and then placing the mixed material into a shearing and dispersing machine for shearing and dispersing to obtain an intermediate.
Further, the step S6 of adjusting the viscosity specifically includes the following steps:
placing the intermediate into a stirrer, opening a micro valve at the upper side of the inside of the stirrer, enabling the rheological additive in the additive tank to flow into the inside of the stirrer, starting stirring by the stirrer, stopping stirring by the micro valve every 3 minutes, detecting the viscosity of the intermediate by a capillary viscometer, detecting that the viscosity of the intermediate does not reach the target viscosity, continuing adding the rheological additive and stirring until the viscosity of the intermediate is detected to reach the target viscosity, and obtaining the water-based UV coating.
Further, the ultrasonic treatment duration in the step S2.3 is 1-1.5h.
Further, the concentration of the NaOH solution used in the step S3.1 is 1mol/L.
Compared with the prior art, the invention has the advantages that:
1. according to the invention, the water-based ultraviolet light curing polyurethane emulsion and the vinyl acetate-ethylene copolymer emulsion are blended, so that more hydrogen bonds can be formed between the water-based ultraviolet light curing polyurethane emulsion and the vinyl acetate-ethylene copolymer, and the water resistance of the finally prepared water-based UV coating is improved.
2. According to the invention, the jute fiber is added into the water-based UV coating, and the surface of the jute fiber has more hydroxyl groups, so that the compatibility of the vinyl acetate-ethylene copolymer emulsion with the water-based ultraviolet light curing resin emulsion can be improved, the molecular gap of the water-based UV coating after film formation is reduced, and the water resistance of the water-based UV coating is improved.
3. According to the invention, the hot air after spray drying is pumped into the gas storage tank for storage, the heat insulation board only needs to slightly raise or lower the temperature, so that the hot air with the temperature required in the step S3.1 can be obtained, and then the hot air in the gas storage tank is pumped into the reaction tank for heating, so that resources can be saved.
Drawings
FIG. 1 is a flow chart of a method for preparing an aqueous UV coating according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
A preparation method of the water-based UV paint is shown in fig. 1, and comprises the following steps:
s1: selecting raw materials
78 parts of aqueous ultraviolet light curing polyurethane emulsion, 20 parts of vinyl acetate-ethylene copolymer emulsion, 4 parts of jute fiber, 18 parts of deionized water, 0.2 part of wetting agent, 0.3 part of leveling agent, 0.3 part of defoamer, 1.5 parts of photoinitiator, 0.2 part of dispersing agent and 0.6 part of rheological additive are selected for standby, wherein the solid content of the aqueous ultraviolet light curing polyurethane emulsion is 40% +/-1%, the viscosity is 10-200 mPa.s, and the solid content of the vinyl acetate-ethylene copolymer emulsion is 50% +/-5%.
S2: oscillating blending
Adding vinyl acetate-ethylene copolymer emulsion and deionized water into a full-temperature oscillator to prepare emulsion with the mass fraction of 5%, oscillating for 1.5 hours at 55 ℃, arranging a liquid storage valve at the upper side inside the full-temperature oscillator, connecting the liquid storage valve with a liquid storage device through a liquid storage pipe, arranging an electromagnetic flowmeter in the liquid storage pipe, opening the liquid storage valve, enabling aqueous ultraviolet curing polyurethane emulsion in the liquid storage device to enter the full-temperature oscillator, detecting that the mass of the aqueous ultraviolet curing polyurethane emulsion flowing out is 4 times that of the vinyl acetate-ethylene copolymer emulsion by the electromagnetic flowmeter, closing the liquid storage valve, continuing oscillating for 1 hour, arranging an ultrasonic generator in the full-temperature oscillator, starting ultrasonic treatment by the ultrasonic generator for 1 hour, and oscillating for 2 hours to obtain the blending emulsion.
S3: pretreatment of jute fiber
Crushing jute fibers by using a crusher, putting the crushed jute fibers into a reaction box, adding deionized water, connecting the reaction box with an air storage box through a connecting pipe, installing a heating air pump in the connecting pipe, pumping hot air at 65 ℃ in the reaction box into the reaction box by the heating air pump to obtain jute fiber solution, filtering the jute fiber solution, removing filtrate to obtain filter residue A, adding the filter residue A into NaOH solution with the concentration of 1mol/L, stirring for 23h to obtain buffer solution, adding the buffer solution and deionized water into the upper layer of the washing box, opening a washing valve at the lower side of a filter screen in the washing box, starting to filter, allowing the filtrate to fall on a separation valve below the filter screen, closing the separation valve and the washing valve, repeating the washing and filtering actions until the pH detector detects that the filtrate is neutral, opening the separation valve, allowing the filtrate to fall into the lower layer of the washing box, closing the separation valve and the washing valve to obtain filter residue B, adding absolute ethyl alcohol into the washing box, washing and filtering 3 times, and obtaining filter residue C.
S4: spray drying
Adding absolute ethyl alcohol into a washing tank, uniformly mixing the absolute ethyl alcohol with filter residue C to obtain a washing solution, then installing an atomizer at the upper part of the washing tank, atomizing the washing solution by the atomizer and spraying the washing solution into an atomizing tank, pumping hot air at 110 ℃ into the atomizing tank, performing spray drying to obtain jute fiber crushed particles, connecting the atomizing tank with a gas storage tank through a guide pipe, installing a drying air pump in the guide pipe, pumping the hot air into the gas storage tank by the drying air pump, detecting the temperature of the hot air by a temperature detector in the gas storage tank, detecting the temperature of the hot air to be more than 65 ℃, cooling by a heat-insulating plate outside the gas storage tank, and maintaining the temperature of the air in the gas storage tank to be 65 ℃.
S5: stirring dispersion and shearing dispersion
Placing the blended emulsion into a stirring and dispersing machine, stirring at a stirring speed of 500r/min, adding deionized water, a wetting agent, a leveling agent, a defoaming agent and a dispersing agent into the stirring and dispersing machine under stirring, then increasing the stirring speed to 1100r/min, stirring for 10min, adding a photoinitiator and jute fiber crushed particles, reducing the stirring speed to 300r/min, obtaining a mixed material after 6min, and then placing the mixed material into a shearing and dispersing machine for shearing and dispersing to obtain an intermediate.
S6: viscosity adjustment
Placing the intermediate into a stirrer, arranging a micro valve on the upper side of the inside of the stirrer, connecting the micro valve with an auxiliary agent box, opening the micro valve, enabling the rheological auxiliary agent in the auxiliary agent box to flow into the inside of the stirrer, starting stirring by the stirrer, closing the micro valve every 3 minutes, stopping stirring by the stirrer, detecting the viscosity of the intermediate by using a capillary viscometer, detecting that the viscosity of the intermediate does not reach the target viscosity, continuing adding the rheological auxiliary agent, and stirring until the viscosity of the intermediate is detected to reach the target viscosity, thereby obtaining the water-based UV coating.
Example 2
A preparation method of the water-based UV paint is shown in fig. 1, and comprises the following steps:
s1: selecting raw materials
78 parts of aqueous ultraviolet light curing polyurethane emulsion, 20 parts of vinyl acetate-ethylene copolymer emulsion, 5 parts of jute fiber, 18 parts of deionized water, 0.2 part of wetting agent, 0.3 part of leveling agent, 0.3 part of defoamer, 1.5 parts of photoinitiator, 0.2 part of dispersing agent and 0.6 part of rheological additive are selected for standby, wherein the solid content of the aqueous ultraviolet light curing polyurethane emulsion is 40% +/-1%, the viscosity is 10-200 mPa.s, and the solid content of the vinyl acetate-ethylene copolymer emulsion is 50% +/-5%.
S2: oscillating blending
Adding vinyl acetate-ethylene copolymer emulsion and deionized water into a full-temperature oscillator to prepare emulsion with the mass fraction of 5%, oscillating for 1.5 hours at 55 ℃, arranging a liquid storage valve at the upper side inside the full-temperature oscillator, connecting the liquid storage valve with a liquid storage device through a liquid storage pipe, arranging an electromagnetic flowmeter in the liquid storage pipe, opening the liquid storage valve, enabling aqueous ultraviolet curing polyurethane emulsion in the liquid storage device to enter the full-temperature oscillator, detecting that the mass of the aqueous ultraviolet curing polyurethane emulsion flowing out is 4 times that of the vinyl acetate-ethylene copolymer emulsion by the electromagnetic flowmeter, closing the liquid storage valve, continuing oscillating for 1 hour, arranging an ultrasonic generator in the full-temperature oscillator, starting ultrasonic treatment by the ultrasonic generator for 1 hour, and oscillating for 2 hours to obtain the blending emulsion.
S3: pretreatment of jute fiber
Crushing jute fibers by using a crusher, putting the crushed jute fibers into a reaction box, adding deionized water, connecting the reaction box with an air storage box through a connecting pipe, installing a heating air pump in the connecting pipe, pumping hot air at 65 ℃ in the reaction box into the reaction box by the heating air pump to obtain jute fiber solution, filtering the jute fiber solution, removing filtrate to obtain filter residue A, adding the filter residue A into NaOH solution with the concentration of 1mol/L, stirring for 23h to obtain buffer solution, adding the buffer solution and deionized water into the upper layer of the washing box, opening a washing valve at the lower side of a filter screen in the washing box, starting to filter, allowing the filtrate to fall on a separation valve below the filter screen, closing the separation valve and the washing valve, repeating the washing and filtering actions until the pH detector detects that the filtrate is neutral, opening the separation valve, allowing the filtrate to fall into the lower layer of the washing box, closing the separation valve and the washing valve to obtain filter residue B, adding absolute ethyl alcohol into the washing box, washing and filtering 3 times, and obtaining filter residue C.
S4: spray drying
Adding absolute ethyl alcohol into a washing tank, uniformly mixing the absolute ethyl alcohol with filter residue C to obtain a washing solution, then installing an atomizer at the upper part of the washing tank, atomizing the washing solution by the atomizer and spraying the washing solution into an atomizing tank, pumping hot air at 110 ℃ into the atomizing tank, performing spray drying to obtain jute fiber crushed particles, connecting the atomizing tank with a gas storage tank through a guide pipe, installing a drying air pump in the guide pipe, pumping the hot air into the gas storage tank by the drying air pump, detecting the temperature of the hot air by a temperature detector in the gas storage tank, detecting the temperature of the hot air to be more than 65 ℃, cooling by a heat-insulating plate outside the gas storage tank, and maintaining the temperature of the air in the gas storage tank to be 65 ℃.
S5: stirring dispersion and shearing dispersion
Placing the blended emulsion into a stirring and dispersing machine, stirring at a stirring speed of 500r/min, adding deionized water, a wetting agent, a leveling agent, a defoaming agent and a dispersing agent into the stirring and dispersing machine under stirring, then increasing the stirring speed to 1100r/min, stirring for 10min, adding a photoinitiator and jute fiber crushed particles, reducing the stirring speed to 300r/min, obtaining a mixed material after 6min, and then placing the mixed material into a shearing and dispersing machine for shearing and dispersing to obtain an intermediate.
S6: viscosity adjustment
Placing the intermediate into a stirrer, arranging a micro valve on the upper side of the inside of the stirrer, connecting the micro valve with an auxiliary agent box, opening the micro valve, enabling the rheological auxiliary agent in the auxiliary agent box to flow into the inside of the stirrer, starting stirring by the stirrer, closing the micro valve every 3 minutes, stopping stirring by the stirrer, detecting the viscosity of the intermediate by using a capillary viscometer, detecting that the viscosity of the intermediate does not reach the target viscosity, continuing adding the rheological auxiliary agent, and stirring until the viscosity of the intermediate is detected to reach the target viscosity, thereby obtaining the water-based UV coating.
Example 3
A preparation method of the water-based UV paint is shown in fig. 1, and comprises the following steps:
s1: selecting raw materials
78 parts of aqueous ultraviolet light curing polyurethane emulsion, 18 parts of vinyl acetate-ethylene copolymer emulsion, 4 parts of jute fiber, 18 parts of deionized water, 0.2 part of wetting agent, 0.3 part of leveling agent, 0.3 part of defoamer, 1.5 parts of photoinitiator, 0.2 part of dispersing agent and 0.6 part of rheological additive are selected for standby, wherein the solid content of the aqueous ultraviolet light curing polyurethane emulsion is 40% +/-1%, the viscosity is 10-200 mPa.s, and the solid content of the vinyl acetate-ethylene copolymer emulsion is 50% +/-5%.
S2: oscillating blending
Adding vinyl acetate-ethylene copolymer emulsion and deionized water into a full-temperature oscillator to prepare emulsion with the mass fraction of 5%, oscillating for 1.5 hours at 55 ℃, arranging a liquid storage valve at the upper side inside the full-temperature oscillator, connecting the liquid storage valve with a liquid storage device through a liquid storage pipe, arranging an electromagnetic flowmeter in the liquid storage pipe, opening the liquid storage valve, enabling aqueous ultraviolet curing polyurethane emulsion in the liquid storage device to enter the full-temperature oscillator, detecting that the mass of the aqueous ultraviolet curing polyurethane emulsion flowing out is 4 times that of the vinyl acetate-ethylene copolymer emulsion by the electromagnetic flowmeter, closing the liquid storage valve, continuing oscillating for 1 hour, arranging an ultrasonic generator in the full-temperature oscillator, starting ultrasonic treatment by the ultrasonic generator for 1 hour, and oscillating for 2 hours to obtain the blending emulsion.
S3: pretreatment of jute fiber
Crushing jute fibers by using a crusher, putting the crushed jute fibers into a reaction box, adding deionized water, connecting the reaction box with an air storage box through a connecting pipe, installing a heating air pump in the connecting pipe, pumping hot air at 65 ℃ in the reaction box into the reaction box by the heating air pump to obtain jute fiber solution, filtering the jute fiber solution, removing filtrate to obtain filter residue A, adding the filter residue A into NaOH solution with the concentration of 1mol/L, stirring for 23h to obtain buffer solution, adding the buffer solution and deionized water into the upper layer of the washing box, opening a washing valve at the lower side of a filter screen in the washing box, starting to filter, allowing the filtrate to fall on a separation valve below the filter screen, closing the separation valve and the washing valve, repeating the washing and filtering actions until the pH detector detects that the filtrate is neutral, opening the separation valve, allowing the filtrate to fall into the lower layer of the washing box, closing the separation valve and the washing valve to obtain filter residue B, adding absolute ethyl alcohol into the washing box, washing and filtering 3 times, and obtaining filter residue C.
S4: spray drying
Adding absolute ethyl alcohol into a washing tank, uniformly mixing the absolute ethyl alcohol with filter residue C to obtain a washing solution, then installing an atomizer at the upper part of the washing tank, atomizing the washing solution by the atomizer and spraying the washing solution into an atomizing tank, pumping hot air at 110 ℃ into the atomizing tank, performing spray drying to obtain jute fiber crushed particles, connecting the atomizing tank with a gas storage tank through a guide pipe, installing a drying air pump in the guide pipe, pumping the hot air into the gas storage tank by the drying air pump, detecting the temperature of the hot air by a temperature detector in the gas storage tank, detecting the temperature of the hot air to be more than 65 ℃, cooling by a heat-insulating plate outside the gas storage tank, and maintaining the temperature of the air in the gas storage tank to be 65 ℃.
S5: stirring dispersion and shearing dispersion
Placing the blended emulsion into a stirring and dispersing machine, stirring at a stirring speed of 500r/min, adding deionized water, a wetting agent, a leveling agent, a defoaming agent and a dispersing agent into the stirring and dispersing machine under stirring, then increasing the stirring speed to 1100r/min, stirring for 10min, adding a photoinitiator and jute fiber crushed particles, reducing the stirring speed to 300r/min, obtaining a mixed material after 6min, and then placing the mixed material into a shearing and dispersing machine for shearing and dispersing to obtain an intermediate.
S6: viscosity adjustment
Placing the intermediate into a stirrer, arranging a micro valve on the upper side of the inside of the stirrer, connecting the micro valve with an auxiliary agent box, opening the micro valve, enabling the rheological auxiliary agent in the auxiliary agent box to flow into the inside of the stirrer, starting stirring by the stirrer, closing the micro valve every 3 minutes, stopping stirring by the stirrer, detecting the viscosity of the intermediate by using a capillary viscometer, detecting that the viscosity of the intermediate does not reach the target viscosity, continuing adding the rheological auxiliary agent, and stirring until the viscosity of the intermediate is detected to reach the target viscosity, thereby obtaining the water-based UV coating.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (8)
1. The preparation method of the water-based UV paint is characterized by comprising the following steps of:
s1: selecting raw materials
75-80 parts of aqueous ultraviolet curing polyurethane emulsion, 15-25 parts of vinyl acetate-ethylene copolymer emulsion, 4-6 parts of jute fiber, 15-25 parts of deionized water, 0.1-0.4 part of wetting agent, 0.1-0.5 part of flatting agent, 0.2-0.4 part of defoamer, 1.5-2 parts of photoinitiator, 0.1-0.3 part of dispersing agent and 0.5-0.8 part of rheological additive are selected for standby;
s2: oscillating blending
Mixing vinyl acetate-ethylene copolymer emulsion and deionized water in an oscillating way, and adding aqueous ultraviolet curing polyurethane aqueous emulsion for blending to obtain blended emulsion;
s3: pretreatment of jute fiber
Crushing jute fibers, washing with deionized water, removing filtrate to obtain filter residue A, adding the filter residue A into NaOH solution, stirring, putting into a washing box, washing with deionized water until the filtrate is neutral, removing filtrate to obtain filter residue B, washing the filter residue B with absolute ethyl alcohol, and removing filtrate to obtain filter residue C;
s4: spray drying
Adding absolute ethyl alcohol into a washing tank, uniformly mixing the absolute ethyl alcohol with filter residues C to obtain a washing solution, atomizing the washing solution by an atomizer at the upper part of the washing tank, spraying the washing solution into an atomizing tank, simultaneously pumping hot air at 110-130 ℃ into the atomizing tank, and performing spray drying to obtain jute fiber crushed particles;
s5: stirring dispersion and shearing dispersion
Stirring and dispersing the blending emulsion, deionized water, a wetting agent, a leveling agent, a defoaming agent, a dispersing agent, a photoinitiator and jute fiber crushed particles, and then shearing and dispersing to obtain an intermediate;
s6: viscosity adjustment
And adding an rheological additive into the intermediate to adjust the viscosity to the target viscosity, so as to obtain the water-based UV coating.
2. The method for preparing the aqueous UV coating according to claim 1, wherein the oscillating blending in the step S2 specifically comprises the following steps:
s2.1: adding the vinyl acetate-ethylene copolymer emulsion into a full-temperature oscillator, adding deionized water to prepare emulsion with the mass fraction of 4-6%, and oscillating for 1-2h at 50-60 ℃;
s2.2: a liquid storage valve in the full-temperature oscillator is opened, the aqueous ultraviolet curing polyurethane emulsion in the liquid storage device flows into the full-temperature oscillator through a liquid storage pipe, the mass of the aqueous ultraviolet curing polyurethane aqueous solution flowing out is 3.5-4.5 times of that of the vinyl acetate-ethylene copolymer emulsion detected by an electromagnetic flowmeter in the liquid storage pipe, and the liquid storage valve is closed and continuously oscillated for 1-2 hours;
s2.3: and (3) performing ultrasonic treatment by an ultrasonic generator in the full-temperature oscillator, and oscillating for 2-3 hours to obtain the blending emulsion.
3. The method for preparing the aqueous UV paint according to claim 1, wherein the pre-treating jute fiber in the step S3 comprises the following steps:
s3.1: crushing jute fibers by using a crusher, putting the crushed jute fibers into a reaction box, adding deionized water, pumping hot air at 60-70 ℃ into the reaction box, filtering again, removing filtrate to obtain filter residue A, adding the filter residue A into NaOH solution, and stirring for 22-25 hours to obtain buffer solution;
s3.2: adding buffer solution and deionized water into the upper layer of a washing box, opening a washing valve at the lower side of a filter screen in the washing box, starting to filter, enabling filtrate to fall on a separation valve below the filter screen, detecting that the filtrate is not neutral by a pH detector in the middle of the washing box, opening the separation valve, enabling the filtrate to fall into the lower layer of the washing box, closing the separation valve and the washing valve, repeating the washing and filtering actions until the pH detector detects that the filtrate is neutral, opening the separation valve, enabling the filtrate to fall into the lower layer of the washing box, and closing the separation valve and the washing valve to obtain filter residues B;
s3.3: and adding absolute ethyl alcohol into a washing box, washing and filtering for 2-4 times to obtain filter residue C.
4. The method for preparing the water-based UV paint according to claim 1, wherein the spray drying in the step S4 is characterized in that after the spray drying is completed, the hot air in the atomization tank is pumped into the gas storage tank through the guide pipe by the drying air pump, the temperature of the hot air is detected by the temperature detector in the gas storage tank, the temperature of the hot air is detected to be not 60-70 ℃, the temperature of the heat insulation board outside the gas storage tank is raised or lowered, the temperature of the air in the gas storage tank is maintained to be 60-70 ℃, and in the step S3.1, when the hot air is required to be pumped, the hot air in the gas storage tank is pumped into the reaction tank from the gas storage tank by the heating air pump.
5. The method for preparing the aqueous UV coating according to claim 1, wherein the stirring dispersion and the shearing dispersion in the step S5 specifically comprises the following steps:
placing the blending emulsion into a stirring and dispersing machine, stirring at a stirring speed of 500-600r/min, adding deionized water, a wetting agent, a leveling agent, a defoaming agent and a dispersing agent into the stirring and dispersing machine under stirring, then increasing the stirring speed to 1000-1200r/min, stirring for 10-25min, adding a photoinitiator and jute fiber crushed particles, reducing the stirring speed to 200-400r/min, and obtaining a mixed material after 5-10min, and then placing the mixed material into a shearing and dispersing machine for shearing and dispersing to obtain an intermediate.
6. The method for preparing an aqueous UV coating according to claim 1, wherein the step S6 of adjusting the viscosity comprises the following steps:
placing the intermediate into a stirrer, opening a micro valve at the upper side of the inside of the stirrer, enabling the rheological additive in the additive tank to flow into the inside of the stirrer, starting stirring by the stirrer every 2-5min, closing the micro valve, stopping stirring by the stirrer, detecting the viscosity of the intermediate by using a capillary viscometer, detecting that the viscosity of the intermediate does not reach the target viscosity, continuing to add the rheological additive and stirring until the viscosity of the intermediate is detected to reach the target viscosity, and obtaining the water-based UV coating.
7. The method for preparing the water-based UV paint according to claim 2, wherein the ultrasonic treatment duration in S2.3 is 1-1.5h.
8. A method of preparing an aqueous UV coating according to claim 3, wherein the NaOH solution used in S3.1 is 1mol/L.
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