CN115260889A - Thick-coating type two-component waterborne polyurethane protective finish - Google Patents
Thick-coating type two-component waterborne polyurethane protective finish Download PDFInfo
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- CN115260889A CN115260889A CN202210901000.3A CN202210901000A CN115260889A CN 115260889 A CN115260889 A CN 115260889A CN 202210901000 A CN202210901000 A CN 202210901000A CN 115260889 A CN115260889 A CN 115260889A
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- waterborne polyurethane
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- 230000001681 protective effect Effects 0.000 title claims abstract description 89
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 72
- 239000004814 polyurethane Substances 0.000 title claims abstract description 72
- 239000011248 coating agent Substances 0.000 title claims abstract description 58
- 238000000576 coating method Methods 0.000 title claims abstract description 58
- 239000003973 paint Substances 0.000 claims abstract description 91
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 45
- GUBGYTABKSRVRQ-UHFFFAOYSA-N 2-(hydroxymethyl)-6-[4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxane-3,4,5-triol Chemical compound OCC1OC(OC2C(O)C(O)C(O)OC2CO)C(O)C(O)C1O GUBGYTABKSRVRQ-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 239000004952 Polyamide Substances 0.000 claims abstract description 20
- 229920002647 polyamide Polymers 0.000 claims abstract description 20
- 239000003349 gelling agent Substances 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 36
- 239000003638 chemical reducing agent Substances 0.000 claims description 34
- 238000003756 stirring Methods 0.000 claims description 32
- 239000002562 thickening agent Substances 0.000 claims description 30
- 239000002253 acid Substances 0.000 claims description 25
- 239000002518 antifoaming agent Substances 0.000 claims description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 15
- 229920000570 polyether Polymers 0.000 claims description 15
- 239000004034 viscosity adjusting agent Substances 0.000 claims description 15
- 229920000151 polyglycol Polymers 0.000 claims description 12
- 239000010695 polyglycol Substances 0.000 claims description 12
- 235000019353 potassium silicate Nutrition 0.000 claims description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 11
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 10
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 10
- 239000002274 desiccant Substances 0.000 claims description 10
- 125000005456 glyceride group Chemical group 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 10
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 229920003009 polyurethane dispersion Polymers 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 9
- 239000005056 polyisocyanate Substances 0.000 claims description 8
- 229920001228 polyisocyanate Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 7
- 229920005989 resin Polymers 0.000 claims description 7
- 125000002723 alicyclic group Chemical group 0.000 claims description 6
- 239000013530 defoamer Substances 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 5
- 229920000168 Microcrystalline cellulose Polymers 0.000 claims description 5
- FACXGONDLDSNOE-UHFFFAOYSA-N buta-1,3-diene;styrene Chemical compound C=CC=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 FACXGONDLDSNOE-UHFFFAOYSA-N 0.000 claims description 5
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 5
- 229940016286 microcrystalline cellulose Drugs 0.000 claims description 5
- 235000019813 microcrystalline cellulose Nutrition 0.000 claims description 5
- 239000008108 microcrystalline cellulose Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000003607 modifier Substances 0.000 claims description 5
- 239000003960 organic solvent Substances 0.000 claims description 5
- 229910001415 sodium ion Inorganic materials 0.000 claims description 5
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 claims description 5
- 150000003505 terpenes Chemical class 0.000 claims description 5
- 235000007586 terpenes Nutrition 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- -1 polyethylene Polymers 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 3
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 3
- 239000005062 Polybutadiene Substances 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 3
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 3
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 3
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 3
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 3
- 229920000609 methyl cellulose Polymers 0.000 claims description 3
- 239000001923 methylcellulose Substances 0.000 claims description 3
- 235000010981 methylcellulose Nutrition 0.000 claims description 3
- 239000011268 mixed slurry Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229920002857 polybutadiene Polymers 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 238000006116 polymerization reaction Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- LNAZSHAWQACDHT-XIYTZBAFSA-N (2r,3r,4s,5r,6s)-4,5-dimethoxy-2-(methoxymethyl)-3-[(2s,3r,4s,5r,6r)-3,4,5-trimethoxy-6-(methoxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6r)-4,5,6-trimethoxy-2-(methoxymethyl)oxan-3-yl]oxyoxane Chemical compound CO[C@@H]1[C@@H](OC)[C@H](OC)[C@@H](COC)O[C@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@H](O[C@H]2[C@@H]([C@@H](OC)[C@H](OC)O[C@@H]2COC)OC)O[C@@H]1COC LNAZSHAWQACDHT-XIYTZBAFSA-N 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N Acrylic acid Chemical compound OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- 229920002125 Sokalan® Polymers 0.000 claims description 2
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 2
- 229960000892 attapulgite Drugs 0.000 claims description 2
- 229960001631 carbomer Drugs 0.000 claims description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 2
- 239000002808 molecular sieve Substances 0.000 claims description 2
- 229910052625 palygorskite Inorganic materials 0.000 claims description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 2
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 2
- 239000000126 substance Substances 0.000 abstract description 4
- 238000005507 spraying Methods 0.000 description 6
- 238000005187 foaming Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000005909 Kieselgur Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 210000001724 microfibril Anatomy 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- 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
- 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
- C09D7/65—Additives macromolecular
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a thick-coating type two-component waterborne polyurethane protective finish, which is characterized by comprising a waterborne polyurethane finish and a waterborne curing agent; the weight ratio of the waterborne polyurethane finish paint to the waterborne curing agent is 20-10; the waterborne polyurethane finish paint comprises the following raw materials in parts by weight. According to the protective finishing paint, the gelling agent is mixed with other components and then exists in the mixed liquid in a net structure, the tightness among the molecules of the other components in the protective finishing paint can be effectively enhanced, the toughness, the density, the surface smoothness and the strength of the protective finishing paint can be effectively improved, meanwhile, the oily substances in the polyamide wax in the protective finishing paint are effectively emulsified through the silicified microcrystalline cellulose powder, so that the surface smoothness and the uniform thickness of the protective finishing paint during thick coating are ensured, the protective finishing paint can be subjected to one-time thick coating, bubbles and pinholes are not generated, and the problem that the existing protective finishing paint cannot be subjected to one-time thick coating is well solved.
Description
Technical Field
The invention relates to the technical field of protective finish paint, in particular to thick-coating type two-component waterborne polyurethane protective finish paint.
Background
The protective finish paint is a typical volume agent type paint, is a final coating of coating, is a layer finally coated in the decoration of a building wall, and shows the overall effect after the decoration. Therefore, the material has high requirements on the used materials, not only has good chromaticity and brightness, but also has the characteristics of good pollution resistance, aging resistance, moisture resistance, mildew resistance, good adsorption force, difficult foaming, pin holes and the like.
However, when the existing protective finish paint is used, in order to ensure that the spraying surface does not generate the phenomena of foaming and pinholes, the protective finish paint is diluted to the maximum extent, so that the spraying thickness of the protective finish paint is insufficient, and the protective finish paint needs to be repeatedly sprayed for two or more times to ensure that the protective finish paint reaches a certain thickness. That is to say, the existing protective finish paint can not reach a certain thickness at one time when in use, and the phenomenon of foaming and pinholes can easily occur when the existing protective finish paint can reach a certain thickness at one time, so that the existing protective finish paint has the problem that the existing protective finish paint can not be thickly coated at one time. Therefore, there is a need to develop a protective topcoat that can achieve the desired thickness without repeated spraying, and that ensures that the finish does not exhibit blistering and pinholes.
Disclosure of Invention
The invention aims to solve the problems and provides a thick coating type two-component waterborne polyurethane protective finish which can reach the required coating thickness without repeated coating and can ensure that the coating surface does not generate foaming and pinhole phenomena, and a preparation method thereof.
The purpose of the invention is realized by the following technical scheme:
a thick-coating type two-component waterborne polyurethane protective finish comprises a waterborne polyurethane finish and a waterborne curing agent; the weight ratio of the waterborne polyurethane finish paint to the waterborne curing agent is 20-10; the waterborne polyurethane finish paint comprises the following raw materials in parts by weight; 8-12 parts of gelling agent, 75-80 parts of aqueous polyurethane dispersoid, 10-15 parts of color paste, 0.3-0.5 part of polyglycol-based defoaming agent, 1-2 parts of water reducing agent, 0.3-0.5 part of polyether defoaming agent, 0.1-0.3 part of thickening agent A, 0.1-0.3 part of thickening agent B, 2-4 parts of slow drying agent, 6-8 parts of silicified microcrystalline cellulose powder, 1-2 parts of polyamide wax and 4-5.5 parts of adhesion liquid.
The weight ratio of the waterborne polyurethane finish paint to the waterborne curing agent is 15; the waterborne polyurethane finish paint comprises the following raw materials in parts by weight: 8 parts of gelling agent, 80 parts of aqueous polyurethane dispersion, 13 parts of color paste, 0.4 part of polyglycol-based defoaming agent, 2 parts of water reducing agent, 0.4 part of polyether defoaming agent, 0.2 part of thickening agent A, 0.2 part of thickening agent B, 3 parts of slow drying agent, 7 parts of silicified microcrystalline cellulose powder, 1.5 parts of polyamide wax and 4.8 parts of adhesion liquid.
The mass ratio of the microcrystalline cellulose to the silicon dioxide in the silicified microcrystalline cellulose powder is 90 to 95, and the silicified microcrystalline cellulose powder has a particle diameter of 15 to 20Lm and a limiting degree of polymerization (LODP) of 386.
In a further preferred embodiment of the present invention, the polyethylene glycol-based antifoaming agent has an ethylene oxide content of 15 to 20%.
In a more preferred embodiment of the present invention, the polyether defoamer has a pH of 4.5 to 6, an acid value ≦ 0.45mgkoH/g, and a hydroxyl value of 52. + -. 4mgkoH/g.
In a further preferred embodiment of the present invention, the thickener a is one or a mixture of two of diatomaceous earth, low molecular polyethylene wax, carbomer resin, attapulgite, molecular sieve and silica gel.
In a further preferred embodiment of the present invention, the thickener B is one or a mixture of two of methylcellulose, hydroxypropyl methylcellulose, sodium carboxymethylcellulose, hydroxyethyl cellulose, butadiene rubber and styrene-butadiene rubber.
As a further preferable embodiment of the present invention, the aqueous curing agent is a mixture of one or two of an aqueous HDI curing agent, an aliphatic amine, an alicyclic enantiomer, and a polyamide with a polyisocyanate.
As a further preferable scheme of the invention, the content of Na + ions in the adhesion liquid is less than or equal to 0.5 percent, and the adhesion liquid comprises the following raw materials in parts by weight: 5-7 parts of styrene-butadiene-styrene copolymer, 4-6 parts of terpene resin, 2-4 parts of rosin glyceride, 4-8 parts of water and 3-6 parts of organic solvent; the relative density of the rosin glyceride is 1.1g/cm3The softening point is not less than 90 ℃, and the acid value is less than 9mgKOH/g.
As a further preferred embodiment of the present invention, the gelling agent packComprises the following raw materials in parts by weight: 3-6 parts of water glass, 12-20 parts of dilute sodium hydroxide solution and 3-5 parts of citric acid; the density of the water glass is 1.26-1.30 g/cm3The density of the citric acid is 1.67-1.71 g/cm3。
In a further preferred embodiment of the present invention, the water reducing agent is a polycarboxylic acid water reducing agent, a viscosity modifier is added to the polycarboxylic acid water reducing agent, the weight percentage of the viscosity modifier added to the polycarboxylic acid water reducing agent is 0.1 to 0.5%, and the viscosity modifier is an oily modifier having a relative molecular mass of 1600 g/mol.
In addition, the preparation method of the thick-coating type two-component waterborne polyurethane protective finish paint comprises the following steps:
(1) Preparing a water-based polyurethane finish:
placing the aqueous polyurethane dispersion and the silicified microcrystalline cellulose powder into a preparation container, stirring for 5-10 minutes at 380-400rpm by using a stirrer, adding the polyglycol-based defoaming agent, stirring at 100-200rpm until no bubbles emerge, and stopping stirring; standing for 30 minutes, adding polyamide wax, adhesion liquid and a thickening agent A, heating the container to 60-70 ℃, uniformly stirring at 200-400rpm in the heating process to ensure that the mixed slurry can be uniformly heated and uniformly mixed, and standing for 2 hours after heating and stirring to cool the container and the slurry in the container to normal temperature; and after the container and the slurry in the container are cooled to normal temperature, sequentially adding a gelatinizing agent, a water reducing agent, a thickening agent B, a slow drying agent and color paste, stirring at 1000-2000rpm until the color of the slurry is one, stopping stirring, standing for 1 hour, adding a polyether defoaming agent, stirring at 100-200rpm until no bubbles emerge, stopping stirring, standing for 1 hour again, vibrating for 30 minutes by using a vibration pump, and standing to obtain the waterborne polyurethane finish.
(2) Preparation of the aqueous curing agent:
one or two of aqueous HDI curing agent, aliphatic amine, alicyclic enantiomer and polyamide is/are mixed with polyisocyanate, stirred for 1.5 hours at 1000-2000rpm, kept stand for 3 hours, vibrated for 10 minutes by a vibration pump and kept stand to obtain the aqueous curing agent.
And finally, mixing the waterborne polyurethane finish paint and the waterborne curing agent according to a selected proportion, stirring at 2000-23000rpm for 1 hour, standing for 4 hours, and introducing into a storage barrel for sealing to obtain the final thick-coating type two-component waterborne polyurethane protective finish paint.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) According to the protective finish paint, the gelling agent is mixed with other components and then exists in the mixed liquid in a net structure, so that the tightness among molecules of the other components in the protective finish paint can be effectively enhanced, the toughness, density, surface smoothness and strength of the protective finish paint can be effectively improved, and meanwhile, oily substances in polyamide wax in the protective finish paint are effectively emulsified through the silicified microcrystalline cellulose powder, so that the surface smoothness and uniform thickness of the protective finish paint during thick coating are ensured, the protective finish paint can be subjected to one-time thick coating, bubbles and pinholes are not generated, and the problem that the existing protective finish paint cannot be subjected to one-time thick coating is well solved.
(2) According to the invention, the water reducing agent and the adhesion liquid phase are matched, so that the dispersity and the fluidity of the protective finishing paint can be effectively improved, the surface smoothness of the protective finishing paint thick coating is further reduced, and bubbles and pinholes can be effectively prevented from appearing on the surface of the protective finishing paint thick coating.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
The thick-coating type two-component waterborne polyurethane protective finish paint comprises a waterborne polyurethane finish paint and a waterborne curing agent. The weight ratio of the waterborne polyurethane finish paint to the waterborne curing agent is 20. The waterborne polyurethane finish paint comprises the following raw materials in parts by weight. 8 parts of gelling agent, 80 parts of aqueous polyurethane dispersion, 15 parts of color paste, 0.5 part of polyglycol-based defoaming agent, 2 parts of water reducing agent, 0.5 part of polyether defoaming agent, 0.3 part of thickening agent A, 0.3 part of thickening agent B, 4 parts of slow drying agent, 8 parts of silicified microcrystalline cellulose powder, 2 parts of polyamide wax and 5.5 parts of adhesion liquid.
Wherein the aqueous curing agent is a mixture of an aqueous HDI curing agent and alicyclic enantiomer and polyisocyanate.
Further, the mass ratio of the microcrystalline cellulose to the silicon dioxide in the silicified microcrystalline cellulose powder was 90. The polyethylene glycol-based antifoaming agent had an ethylene oxide content of 15%. The pH value of the polyether defoamer is 4.5, the acid value is less than or equal to 0.45mgkoH/g, and the hydroxyl value is 52 +/-4 mgkoH/g. The thickener A is a mixture of diatomite and low-molecular polyethylene wax. Thickener B is a mixture of methylcellulose and hydroxypropyl methylcellulose.
Furthermore, the content of Na + ions in the adhesion liquid is less than or equal to 0.5 percent, and the adhesion liquid comprises the following raw materials in parts by weight: 5 parts of styrene-butadiene-styrene copolymer, 6 parts of terpene resin, 4 parts of rosin glyceride, 8 parts of water and 3 parts of organic solvent. Wherein the relative density of rosin glyceride is 1.1g/cm3The softening point is not less than 90 ℃, and the acid value is less than 9mgKOH/g.
Meanwhile, the gelling agent comprises the following raw materials in parts by weight: 6 parts of water glass, 12 parts of dilute sodium hydroxide solution and 3 parts of citric acid. The density of the water glass is 1.26g/cm3The density of citric acid is 1.67g/cm3。
The water reducing agent is a polycarboxylic acid water reducing agent, a viscosity modifier is added to the polycarboxylic acid water reducing agent, the weight percentage of the viscosity modifier added to the polycarboxylic acid water reducing agent is 0.5%, and the viscosity modifier is an oily modifier with the relative molecular mass of 1600 g/mol.
Example 2
The thick-coating type two-component waterborne polyurethane protective finish paint comprises a waterborne polyurethane finish paint and a waterborne curing agent. The weight ratio of the waterborne polyurethane finish paint to the waterborne curing agent is 15. The waterborne polyurethane finish paint comprises the following raw materials in parts by weight. 8 parts of gelling agent, 80 parts of aqueous polyurethane dispersion, 13 parts of color paste, 0.4 part of polyglycol-based defoaming agent, 2 parts of water reducing agent, 0.4 part of polyether defoaming agent, 0.2 part of thickening agent A, 0.2 part of thickening agent B, 3 parts of slow drying agent, 7 parts of silicified microcrystalline cellulose powder, 1.5 parts of polyamide wax and 4.8 parts of adhesion liquid.
Wherein the water-based curing agent is a mixture of a water-based HDI curing agent and polyisocyanate.
Further, the mass ratio of the microcrystalline cellulose to the silicon dioxide in the silicified microcrystalline cellulose powder was 95. The ethylene oxide content of the polyglycol-based antifoam agent was 17%. The pH value of the polyether defoamer is 5.5, the acid value is less than or equal to 0.45mgkoH/g, and the hydroxyl value is 52 +/-4 mgkoH/g. The thickener A is a mixture of silica gel and low molecular polyethylene wax. The thickener B is hydroxyethyl cellulose.
Furthermore, the content of Na + ions in the adhesion liquid is less than or equal to 0.5 percent, and the adhesion liquid comprises the following raw materials in parts by weight: 6 parts of styrene-butadiene-styrene copolymer, 5 parts of terpene resin, 3 parts of rosin glyceride, 6 parts of water and 5 parts of organic solvent. Wherein the relative density of rosin glyceride is 1.1g/cm3The softening point is not less than 90 ℃, and the acid value is less than 9mgKOH/g.
Meanwhile, the gelling agent comprises the following raw materials in parts by weight: 4.5 parts of water glass, 15 parts of dilute sodium hydroxide solution and 4 parts of citric acid. The density of the water glass is 1.28g/cm3The density of citric acid is 1.69g/cm3。
The water reducing agent is a polycarboxylic acid water reducing agent, a viscosity modifier is added to the polycarboxylic acid water reducing agent, the weight percentage of the viscosity modifier added to the polycarboxylic acid water reducing agent is 0.3%, and the viscosity modifier is an oily modifier with the relative molecular mass of 1600 g/mol.
Example 3
The thick-coating type two-component waterborne polyurethane protective finish comprises waterborne polyurethane finish and a waterborne curing agent; the weight ratio of the waterborne polyurethane finish paint to the waterborne curing agent is 10; the waterborne polyurethane finish paint comprises the following raw materials in parts by weight; 12 parts of gelling agent, 75 parts of aqueous polyurethane dispersion, 10 parts of color paste, 0.3 part of polyglycol-based defoaming agent, 1 part of water reducing agent, 0.3 part of polyether defoaming agent, 0.1 part of thickening agent A, 0.1 part of thickening agent B, 2 parts of slow drying agent, 6 parts of silicified microcrystalline cellulose powder, 1 part of polyamide wax and 4 parts of adhesion liquid.
Wherein the aqueous curing agent is a mixture of an aqueous HDI curing agent and polyamide and polyisocyanate.
Further, the mass ratio of the microcrystalline cellulose to the silicon dioxide in the silicified microcrystalline cellulose powder was 93. The ethylene oxide content of the polyglycol-based antifoam agent was 20%. The pH value of the polyether defoamer is 6, the acid value is less than or equal to 0.45mgkoH/g, and the hydroxyl value is 52 +/-4 mgkoH/g. Thickener a is a silicone gel. The thickener B is a mixture of butadiene rubber and fatty amine.
Furthermore, the content of Na + ions in the adhesion liquid is less than or equal to 0.5 percent, and the adhesion liquid comprises the following raw materials in parts by weight: 7 parts of styrene-butadiene-styrene copolymer, 4 parts of terpene resin, 2 parts of rosin glyceride, 4 parts of water and 6 parts of organic solvent. Wherein the relative density of rosin glyceride is 1.1g/cm3The softening point is not less than 90 ℃, and the acid value is less than 9mgKOH/g.
Meanwhile, the gelling agent comprises the following raw materials in parts by weight: 3 parts of water glass, 20 parts of dilute sodium hydroxide solution and 5 parts of citric acid. The density of the water glass is 1.30g/cm3The density of citric acid is 1.71g/cm3。
The water reducing agent is a polycarboxylic acid water reducing agent, a viscosity modifier is added to the polycarboxylic acid water reducing agent, the weight percentage of the viscosity modifier added to the polycarboxylic acid water reducing agent is 0.1%, and the viscosity modifier is an oily modifier with the relative molecular mass of 1600 g/mol.
The preparation method of the thick-coating type two-component waterborne polyurethane protective finish paint in the above embodiment 1, embodiment 2 and embodiment 3 is as follows:
(1) Preparing a water-based polyurethane finish:
placing the aqueous polyurethane dispersion and the silicified microcrystalline cellulose powder into a preparation container, stirring the mixture for 5 to 10 minutes at 380 to 400rpm by using a stirrer, adding the polyglycol-based antifoaming agent, stirring the mixture at 100 to 200rpm until no bubbles emerge, and stopping stirring. Standing for 30 minutes, adding the polyamide wax, the adhesion liquid and the thickening agent A, heating the container to 60-70 ℃, uniformly stirring at 200-400rpm in the heating process to ensure that the mixed slurry can be uniformly heated and uniformly mixed, and standing for 2 hours after heating and stirring to cool the container and the slurry in the container to normal temperature. And after the container and the slurry in the container are cooled to normal temperature, sequentially adding a gelatinizing agent, a water reducing agent, a thickening agent B, a slow drying agent and color paste, stirring at 1000-2000rpm until the color of the slurry is one, stopping stirring, standing for 1 hour, adding a polyether defoaming agent, stirring at 100-200rpm until no bubbles emerge, stopping stirring, standing for 1 hour again, vibrating for 30 minutes by using a vibration pump, and standing to obtain the waterborne polyurethane finish.
(2) Preparation of the aqueous curing agent:
mixing one or two of aqueous HDI curing agent, aliphatic amine, alicyclic enantiomer and polyamide with polyisocyanate, stirring at 1000-2000rpm for 1.5 hr, standing for 3 hr, vibrating with vibration pump for 10 min, and standing to obtain the aqueous curing agent.
And finally, mixing the waterborne polyurethane finish paint and the waterborne curing agent according to a selected proportion, stirring at 2000-23000rpm for 1 hour, standing for 4 hours, and introducing into a storage barrel for sealing to obtain the final thick-coating type two-component waterborne polyurethane protective finish paint.
During specific implementation, the gelling agent is mixed with other components and then exists in the mixed liquid in a net structure, so that the tightness among molecules of the other components in the protective finish paint can be effectively enhanced, the toughness, the density, the surface smoothness and the strength of the protective finish paint can be effectively improved, and meanwhile, the oily substances in the polyamide wax in the protective finish paint are effectively emulsified by the silicified microcrystalline cellulose powder, so that the surface smoothness and the uniform thickness of the protective finish paint during thick coating are ensured. The water reducing agent and the adhesion liquid phase are matched, so that the dispersibility and the flowability of the protective finish can be effectively improved, the surface smoothness of the protective finish is further reduced, bubbles and pinholes can be effectively prevented from appearing on the surface of the protective finish, the protective finish can be subjected to one-time thick coating, the bubbles and the pinholes cannot be generated, and the problem that the existing protective finish cannot be subjected to one-time thick coating is well solved.
In order to illustrate various performances of the thick-coating type two-component waterborne polyurethane protective finish paint prepared in the embodiments 1 to 3, the applicant detects the viscosity, the adhesive force and the fineness of the thick-coating type two-component waterborne polyurethane protective finish paint prepared in the embodiments 1 to 3, and compares various performance parameters of the thick-coating type two-component waterborne polyurethane protective finish paint with the viscosity, the adhesive force and the fineness of the existing protective finish paint, wherein the parameters of the performances of the thick-coating type two-component waterborne polyurethane protective finish paint and the existing protective finish paint are as shown in the following table 1:
TABLE 1
In addition, the applicant also respectively detects the surface drying time, surface bubbles, surface pores, 24h hardness and 7-day hardness of the thick-coating type two-component waterborne polyurethane protective finish paint with the one-time spraying thickness of 200 μm in the case of different weight ratios of the waterborne polyurethane finish paint and the waterborne curing agent in the embodiments 1 to 3 of the application and the conventional protective finish paint with the multiple spraying thickness of 200 μm, and compares the detection and comparison results with the following table 2:
| detecting items | Example one (20 | Example two (15 | Example three (10 | Prior Art |
| Open time | 40min | 40min | 30min | 50min |
| Surface bubbles | Bubble-free | Micro-bubble | Small amount of bubbles | A large number of bubbles |
| Surface pinhole | No pinhole | No pinhole | No pinhole | A large number of pinholes |
| Hardness of 24h | B | B | B | B2 |
| Hardness of 7 days | H | H | H | H1 |
TABLE 2
From the data shown in the table 1 of the data of the performance test of the thick-coating type two-component waterborne polyurethane protective finish paint, the physical property viscosity, fineness and adhesive force of the thick-coating type two-component waterborne polyurethane protective finish paint are superior to those of the existing protective finish paint when the component amount of the thick-coating type two-component waterborne polyurethane protective finish paint is changed. According to the data shown in table 2, it can be fully demonstrated that the thick-coating type two-component waterborne polyurethane protective finish can realize one-time thick coating, and the surface drying time, surface bubbles, surface pores, 24h hardness and 7-day hardness of the one-time thick coating are superior to those of the protective finish in the prior art after being sprayed for multiple times. Meanwhile, the same amount of the gelling agent and the water reducing agent is adopted, and when the density of water glass in the components of the gelling agent, the density of citric acid and the component of silicified microcrystalline cellulose powder are different, the viscosity, the density and the surface drying time, surface bubbles, surface pores, the hardness of 24h and the hardness of 7 days of the thick-coating type two-component waterborne polyurethane protective finish paint are different, namely the viscosity, the density and the density of citric acid in the components of the gelling agent and the weight ratio of the component of the silicified microcrystalline cellulose powder, the waterborne polyurethane finish paint and the waterborne curing agent are changed, so that the control of the viscosity, the density, the foaming rate and the pinhole rate of spraying of the thick-coating type two-component waterborne polyurethane protective finish paint can be realized.
Further, as is clear from the test data in tables 1 and 2, when the weight ratio of the aqueous polyurethane top coat to the aqueous curing agent is 15, the mass ratio of the microfibril to the silicon dioxide in the silicified microcrystalline cellulose powder is 95, and the particle size of the silicified microcrystalline cellulose powder is 15Lm and the limiting degree of polymerization (LODP) is 386, the physical properties, the surface drying time, the surface blisters, the surface blistering, the 24h hardness, and the 7 day hardness of the thick coating type two-component aqueous polyurethane protective top coat are optimal.
According to the invention, the gelling agent exists in the mixed liquid in a net structure after being mixed with other components, the tightness among molecules of other components in the protective finish paint can be effectively enhanced, the toughness, density, surface smoothness and strength of the protective finish paint can be effectively improved, and meanwhile, the oily substances in the polyamide wax in the protective finish paint are effectively emulsified through the silicified microcrystalline cellulose powder, so that the surface smoothness and uniform thickness of the protective finish paint during thick coating are ensured. The water reducing agent and the adhesion liquid phase are matched, so that the dispersibility and the flowability of the protective finish can be effectively improved, the surface smoothness of the protective finish is further reduced, and bubbles and pinholes can be effectively prevented from appearing on the surface of the protective finish, so that the protective finish can be subjected to one-time thick coating without generating bubbles and pinholes, and the problem that the existing protective finish cannot be subjected to one-time thick coating is well solved.
As described above, the present invention can be preferably realized.
Claims (10)
1. A thick-coating type two-component waterborne polyurethane protective finish is characterized by comprising a waterborne polyurethane finish and a waterborne curing agent; the weight ratio of the waterborne polyurethane finish paint to the waterborne curing agent is 20-10; the waterborne polyurethane finish paint comprises the following raw materials in parts by weight: 8-12 parts of gelling agent, 75-80 parts of aqueous polyurethane dispersion, 10-15 parts of color paste, 0.3-0.5 part of polyglycol-based defoaming agent, 1-2 parts of water reducing agent, 0.3-0.5 part of polyether defoaming agent, 0.1-0.3 part of thickening agent A, 0.1-0.3 part of thickening agent B, 2-4 parts of slow drying agent, 6-8 parts of silicified microcrystalline cellulose powder, 1-2 parts of polyamide wax and 4-5.5 parts of adhesive liquid;
the waterborne curing agent is a mixture of polyisocyanate and one or two of waterborne HDI curing agent, aliphatic amine, alicyclic enantiomer and polyamide;
the mass ratio of the microcrystalline cellulose to the silicon dioxide in the silicified microcrystalline cellulose powder is 90 to 95, and the silicified microcrystalline cellulose powder has a particle diameter of 15 to 20Lm and a limiting degree of polymerization (LODP) of 386.
2. The thick-coating two-component waterborne polyurethane protective finish paint according to claim 1, wherein the weight ratio of the waterborne polyurethane finish paint to the waterborne curing agent is 15; the waterborne polyurethane finish paint comprises the following raw materials in parts by weight: 8 parts of gelling agent, 80 parts of aqueous polyurethane dispersion, 13 parts of color paste, 0.4 part of polyglycol-based defoaming agent, 2 parts of water reducing agent, 0.4 part of polyether defoaming agent, 0.2 part of thickening agent A, 0.2 part of thickening agent B, 3 parts of slow drying agent, 7 parts of silicified microcrystalline cellulose powder, 1.5 parts of polyamide wax and 4.8 parts of adhesion liquid.
3. The thick-coating two-component waterborne polyurethane protective finish according to claim 2, wherein the polyethylene glycol defoamer has an ethylene oxide content of 15-20%.
4. The thick-coating two-component waterborne polyurethane protective finish paint according to claim 3, wherein the polyether defoamer has a pH value of 4.5-6, an acid value less than or equal to 0.45mgkoH/g, and a hydroxyl value of 52 +/-4 mgkoH/g.
5. The heavy coating type two-component waterborne polyurethane protective finishing paint of claim 4, wherein the thickener A is one or a mixture of two of diatomite, low-molecular polyethylene wax, carbomer resin, attapulgite, a molecular sieve and silica gel.
6. The thick-coating two-component waterborne polyurethane protective finishing paint according to claim 5, wherein the thickener B is one or a mixture of two of methyl cellulose, hydroxypropyl methyl cellulose, sodium carboxymethyl cellulose, hydroxyethyl cellulose, butadiene rubber and styrene butadiene rubber.
7. The thick-coating type two-component waterborne polyurethane protective finish paint according to claim 6, wherein the content of Na + ions in the adhesion liquid is less than or equal to 0.5%, and the adhesion liquid comprises the following raw materials in parts by weight: 5-7 parts of styrene-butadiene-styrene copolymer, 4-6 parts of terpene resin, 2-4 parts of rosin glyceride, 4-8 parts of water and 3-6 parts of organic solvent; the relative density of the rosin glyceride is 1.1g/cm3The softening point is not less than 90 ℃, and the acid value is less than 9mgKOH/g.
8. The thick-coating type two-component waterborne polyurethane protective finish paint as claimed in claim 7, wherein the gelling agent comprises the following raw materials in parts by weight: 3-6 parts of water glass, 12-20 parts of dilute sodium hydroxide solution and 3-5 parts of citric acid; the density of the water glass is 1.26-1.30 g/cm3The density of the citric acid is 1.67-1.71 g/cm3。
9. The thick-coating type two-component waterborne polyurethane protective finishing paint according to claim 8, wherein the water reducing agent is a polycarboxylic acid water reducing agent, a viscosity modifier is added into the polycarboxylic acid water reducing agent, the weight percentage of the viscosity modifier added into the polycarboxylic acid water reducing agent is 0.1-0.5%, and the viscosity modifier is an oily modifier with the relative molecular mass of 1600 g/mol.
10. The thick-coating type two-component waterborne polyurethane protective finish paint as claimed in any one of claims 1 to 9, wherein the preparation method of the thick-coating type two-component waterborne polyurethane protective finish paint is as follows:
(1) Preparing a water-based polyurethane finish:
placing the aqueous polyurethane dispersion and the silicified microcrystalline cellulose powder into a preparation container, stirring for 5-10 minutes at 380-400rpm by using a stirrer, adding the polyglycol-based defoaming agent, stirring at 100-200rpm until no bubbles emerge, and stopping stirring; standing for 30 minutes, adding polyamide wax, adhesion liquid and a thickening agent A, heating the container to 60-70 ℃, uniformly stirring at 200-400rpm in the heating process to ensure that the mixed slurry can be uniformly heated and uniformly mixed, and standing for 2 hours after heating and stirring to cool the container and the slurry in the container to normal temperature; after the container and the slurry in the container are cooled to normal temperature, sequentially adding a gelatinizing agent, a water reducing agent, a thickening agent B, a slow drying agent and color paste, stirring at 1000-2000rpm until the color of the slurry is one, stopping stirring, standing for 1 hour, adding a polyether defoaming agent, stirring at 100-200rpm until no bubbles emerge, stopping stirring, standing for 1 hour again, vibrating for 30 minutes by using a vibration pump, and standing to obtain the waterborne polyurethane finish;
(2) Preparation of the aqueous curing agent:
mixing one or two of aqueous HDI curing agent, aliphatic amine, alicyclic enantiomer and polyamide with polyisocyanate, stirring at 1000-2000rpm for 1.5 hours, standing for 3 hours, vibrating by a vibration pump for 10 minutes, and standing to obtain the aqueous curing agent;
and finally, mixing the waterborne polyurethane finish paint and the waterborne curing agent according to a selected proportion, stirring at 2000-2300rpm for 1 hour, standing for 4 hours, and introducing into a storage barrel for sealing to obtain the final thick-coating type double-component waterborne polyurethane protective finish paint.
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