CN116042067A - Preparation and application of bio-based thick-coatable aqueous two-component transparent primer - Google Patents
Preparation and application of bio-based thick-coatable aqueous two-component transparent primer Download PDFInfo
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- CN116042067A CN116042067A CN202310024144.XA CN202310024144A CN116042067A CN 116042067 A CN116042067 A CN 116042067A CN 202310024144 A CN202310024144 A CN 202310024144A CN 116042067 A CN116042067 A CN 116042067A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 44
- 239000013530 defoamer Substances 0.000 claims abstract description 30
- 239000008367 deionised water Substances 0.000 claims abstract description 30
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 30
- 239000003973 paint Substances 0.000 claims abstract description 23
- 239000004814 polyurethane Substances 0.000 claims abstract description 22
- 229920002635 polyurethane Polymers 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 14
- 239000002270 dispersing agent Substances 0.000 claims abstract description 13
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 229910052664 nepheline Inorganic materials 0.000 claims abstract description 12
- 239000010434 nepheline Substances 0.000 claims abstract description 12
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229920000180 alkyd Polymers 0.000 claims abstract description 10
- 238000011049 filling Methods 0.000 claims abstract description 10
- 150000003672 ureas Chemical class 0.000 claims abstract description 10
- 239000000080 wetting agent Substances 0.000 claims abstract description 10
- 239000005058 Isophorone diisocyanate Substances 0.000 claims abstract description 9
- 239000012024 dehydrating agents Substances 0.000 claims abstract description 9
- 150000002505 iron Chemical class 0.000 claims abstract description 9
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000009736 wetting Methods 0.000 claims abstract description 7
- 239000002562 thickening agent Substances 0.000 claims abstract description 6
- 238000000576 coating method Methods 0.000 claims description 18
- 239000011248 coating agent Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000006254 rheological additive Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 229920001296 polysiloxane Polymers 0.000 claims description 6
- 239000002023 wood Substances 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000012752 auxiliary agent Substances 0.000 claims description 2
- 239000006221 furniture coating Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 229910000859 α-Fe Inorganic materials 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000000518 rheometry Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 229910014314 BYK190 Inorganic materials 0.000 description 4
- 206010027627 Miliaria Diseases 0.000 description 4
- 201000004169 miliaria rubra Diseases 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000000839 emulsion Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229920003009 polyurethane dispersion Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- 241000084370 Catalpa bungei Species 0.000 description 1
- 240000007049 Juglans regia Species 0.000 description 1
- 235000009496 Juglans regia Nutrition 0.000 description 1
- 241001448624 Miliaria Species 0.000 description 1
- 235000006040 Prunus persica var persica Nutrition 0.000 description 1
- 240000006413 Prunus persica var. persica Species 0.000 description 1
- 229920002531 Rubberwood Polymers 0.000 description 1
- 241001106462 Ulmus Species 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 235000020234 walnut Nutrition 0.000 description 1
- 230000002087 whitening effect Effects 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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
- C09D167/08—Polyesters modified with higher fatty oils or their acids, or with natural resins or resin acids
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/002—Priming paints
-
- 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
- C09F—NATURAL RESINS; FRENCH POLISH; DRYING-OILS; OIL DRYING AGENTS, i.e. SICCATIVES; TURPENTINE
- C09F9/00—Compounds to be used as driers, i.e. siccatives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0893—Zinc
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to a bio-based thick coatable aqueous two-component transparent primer, which consists of main paint and a curing agent 2: the main paint is prepared by mixing, wherein the main paint consists of waterborne polyurethane modified alkyd resin, a wetting dispersant, deionized water, an organosilicon defoamer 1, an organosilicon defoamer 2, a base material wetting agent, an iron salt drier, a modified urea rheological aid, nepheline powder, zinc powder, an associated polyurethane thickener, a silicate rheological aid and the like, and the curing agent consists of an HDI type waterborne curing agent, an IPDI type waterborne curing agent, a dehydrating agent and the like. The invention discloses a preparation method and application of a bio-based thick-coatable aqueous double-component transparent primer, which has high paint film fullness, good filling property, long service time, safety and environmental protection, and can be coated once or repeatedly.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to preparation and application of a bio-based thick-coatable aqueous double-component transparent primer.
Background
In recent years, with the development of furniture manufacturing industry and decoration industry in China, the oil-to-water technology is gradually carried out in the field of high-end custom-made solid wood which only needs high resistance, high hardness and high permeability, and a full-water product and a construction process are adopted. In the field of high-end custom-made solid wood furniture, most of furniture substrates are peach hearts, walnut, elm, catalpa bungei, and the like with deeper ducts and distinct layers, and the coating process is basically a full-closed coating effect. The conventional water paint on the market is easy to cause the problems of fullness, poor filling property, white prickly heat at thick coating and edge accumulation, influence on transparency due to repeated coating, sinking at the later stage and the like. The problem is mainly that the conventional water-based transparent primer is easy to shrink after a paint film is dried, and meanwhile, thick coating and repeated coating cannot be performed once, so that better filling property and fullness cannot be provided, and the environment-friendly requirement cannot be met when an oily PU product is used.
Therefore, there is a need to provide a preparation and application of a bio-based thick coatable aqueous two-component transparent primer to solve the above problems.
Disclosure of Invention
The invention aims to overcome the defects and the defects of the prior art, and provides the preparation and the application of the bio-based thick-coatable aqueous double-component transparent primer, which has high paint film fullness, good filling property, long service time and more safety and environmental protection, and can be thick-coated once or repeatedly coated.
The aim of the invention is realized by the following technical scheme:
a bio-based thick coatable aqueous two-component clear primer consisting of a main paint and a curing agent 2:1, wherein the main paint is prepared by mixing the following raw materials in percentage by weight:
65 to 55 percent of water-based polyurethane modified alkyd resin,
0.2 to 0.4 percent of wetting dispersant,
16 to 22 percent of deionized water,
1.3 to 0.8 percent of organic silicon defoamer,
2.3 to 0.8 percent of organic silicon defoamer,
0.3 to 0.8 percent of base material wetting agent,
0.3 to 0.8 percent of ferrite drier,
0.1 to 0.3 percent of modified urea rheological additive,
3 to 10 percent of nepheline powder,
zinc powder 0.5-2%,
0.2 to 0.4 percent of associative polyurethane thickener,
silicate rheological auxiliary agent 1-3%;
the curing agent is prepared by mixing the following raw materials in percentage by weight:
40% of HDI type water-based curing agent,
59.8% of IPDI type water-based curing agent,
0.2% of dehydrating agent.
As a preferred embodiment of the present invention, the silicone defoamer 1 adopts TEGO902W, and the silicone defoamer 2 adopts BYK022.
As a preferable technical scheme of the invention, the deionized water is divided into first deionized water and second deionized water, wherein the first deionized water accounts for 1% -2%, and the second deionized water accounts for 15% -20%.
As a preferable technical scheme of the invention, the preparation steps of the main paint are as follows:
firstly, a special clean container is taken to add waterborne polyurethane modified alkyd resin into a dispersing cylinder, a dispersing machine is started to stir at 500r/min, then a dispersing agent is wetted, the rotating speed is adjusted to 1000r/min, and the dispersing agent is dispersed for 5 minutes to obtain a mixture A;
step two, taking a clean container, premixing first deionized water, an organosilicon defoamer 1 and an organosilicon defoamer 2, and then adding the premixed first deionized water, the organosilicon defoamer 1 and the organosilicon defoamer 2 into a mixture A of a dispersing cylinder at a dispersing speed of 1000r/min at a flow rate of 2-3 KG/min; the rotating speed is adjusted to 800r/min, a base material wetting agent, an iron salt drier, a modified urea rheological additive, nepheline powder and zinc powder are sequentially added, the rotating speed is adjusted to 1300r/min, the high-speed dispersion is carried out for 20-30min, a mixture B is obtained, QC detection fineness of the mixture B is less than 30, and the drawing plate has no shrinkage cavity;
and thirdly, adjusting the rotating speed to 800r/min, sequentially adding the second deionized water, the associative polyurethane thickener and the silicate rheological additive into a dispersing cylinder, and stirring at a medium speed for 20-30min until the scraping plate has no shrinkage cavity, so as to prepare the transparent main paint.
5. The preparation of the bio-based thick coatable aqueous two-component clear primer according to claim 1, wherein the preparation of the curing agent comprises the steps of:
step A, taking a special clean container, sequentially adding an HDI type water-based curing agent, an IPDI type water-based curing agent and a dehydrating agent into a dispersing cylinder, starting a dispersing machine, uniformly stirring at 800r/min, and stirring for 10 minutes to obtain the curing agent;
and B, taking a clean packaging tank, flushing nitrogen N2, filling the mixed curing agent into the tank, and immediately sealing for later use.
As a preferable embodiment of the present invention, the HDI-type aqueous curing agent is DNW5500, and the IPDI-type aqueous curing agent is OS9402.
As a preferable technical scheme of the invention, the solid content of the transparent primer is 35+/-2%, the viscosity of the transparent primer is 88-96KU, and the PH value of the transparent primer is 7.
Based on the same conception, the invention also provides application of the bio-based thick coatable aqueous two-component transparent primer in solid wood furniture coating.
Further, the construction mode of the transparent primer adopts manual diaphragm pump spraying, the coating weight is 180-220 g/square meter, the drying adopts normal temperature leveling for 2-3h, and the baking is carried out for 12-16h at 35-40 ℃.
By adopting the technical scheme, the invention has the following advantages:
1. the waterborne polyurethane modified alkyd resin AKD2734 adopted by the invention has the characteristics of high fullness, no prickly heat in thick coating and no influence on transparency in one-time recoating, and has better prickly heat prevention and whitening effects compared with the conventional waterborne high-hydroxyl emulsion, and has better fullness compared with the conventional waterborne polyurethane emulsion.
2. According to the invention, the special nepheline powder Finex12 is selected as the filling powder, so that the influence of the powder on the transparency is reduced to the maximum extent while the filling property of the product is ensured, and the hardness of a product system can be improved, so that the product has excellent transparency.
3. According to the invention, the iron salt drier 1101 is adopted to be matched with the selected waterborne polyurethane modified alkyd resin AKD2734, so that the dryness, the hardness rising speed and the final hardness index of a product system are effectively improved.
4. Compared with bentonite-type rheological additives, the silicate rheological additive BYS 482 adopted by the invention has good sagging resistance, and has small influence on the transparency of a product system, so that the product has excellent transparency and recoating transparency.
5. The curing agent adopts the HDI type water-based curing agent DNW5500 and the IPDI type water-based curing agent OS9402, can effectively prolong the service life of the product and helps to promote the fullness.
6. The preparation and application of the bio-based thick coatable aqueous double-component transparent primer provided by the patent solve the problems of fullness, poor filling property, whiteness and miliaria at thick coating and edge accumulation, influence on transparency due to repeated re-coating, subsidence at the later stage and the like of the aqueous coating and similar oily PE product, and the formula product provides a formula solution for the disposable thick coating process of the aqueous coating.
Detailed Description
In order to make the technical scheme and gist of the present invention more clear, the following further describes the embodiments of the present invention in detail.
The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention.
Example 1:
the main paint is prepared by mixing the following raw materials in percentage by weight: 70% of polyurethane modified alkyd resin AKD2734, 0.2% of wetting dispersant BYK190, 1% of first deionized water, 0.5% of organosilicon defoamer TEGO902W, 0.3% of organosilicon defoamer BYK022, 0.3% of base material wetting agent TEGO4100, 0.5% of iron salt drier 1101, 0.1% of modified urea rheology aid BYK7420ES, 5% of nepheline powder Finex12, 1% of zinc powder PLG, 18.8% of second deionized water, 0.3% of associative polyurethane rheology aid PUR44 and 2% of silicate rheology aid BYKS 482.
Comparative example 1-1:
the main paint is prepared by mixing the following raw materials in percentage by weight: 70% of aqueous hydroxyl acrylic emulsion XP2470, 0.2% of wetting dispersant BYK190, 1% of first deionized water, 0.5% of organosilicon defoamer TEGO902W, 0.3% of organosilicon defoamer BYK022, 0.3% of base material wetting agent TEGO4100, 0.5% of iron salt drier 1101, 0.1% of modified urea rheology aid BYK7420ES, 5% of nepheline powder Finex12, 1% of zinc powder PLG, 18.8% of second deionized water, 0.3% of associative polyurethane rheology aid PUR44 and 2% of silicate rheology aid BYKS 482.
Comparative examples 1-2:
the main paint is prepared by mixing the following raw materials in percentage by weight: 70% of aqueous polyurethane dispersion R2180, 0.2% of wetting dispersant BYK190, 1% of first deionized water, 0.5% of organosilicon defoamer TEGO902W, 0.3% of organosilicon defoamer BYK022, 0.3% of base material wetting agent TEGO4100, 0.5% of iron salt drier 1101, 0.1% of modified urea rheology aid BYK7420ES, 5% of nepheline powder Finex12, 1% of zinc powder PLG, 18.8% of second deionized water, 0.3% of associative polyurethane rheology aid PUR44 and 2% of silicate rheology aid BYKS482 aqueous solution.
Comparative examples 1-3:
the main paint is prepared by mixing the following raw materials in percentage by weight: 70% vegetable oil modified polyurethane dispersion 4101, 0.2% wetting dispersant BYK190, 1% first deionized water, 0.5% silicone defoamer TEGO902W, 0.3% silicone defoamer BYK022, 0.3% base material wetting agent TEGO4100, 0.5% iron salt drier 1101, 0.1% modified urea rheology aid BYK7420ES, 5% nepheline powder Finex12, 1% zinc powder PLG, 18.8% second deionized water, 0.3% associative polyurethane rheology aid PUR44, 2% silicate rheology aid BYKS482 aqueous solution.
The main paint was prepared according to the following preparation method by using example 1 and comparative examples 1-1, 1-2 and 1-3, and the specific steps are as follows:
firstly, a special clean container is taken to add waterborne polyurethane modified alkyd resin into a dispersing cylinder, a dispersing machine is started to stir at 500r/min, then a dispersing agent is wetted, the rotating speed is adjusted to 1000r/min, and the dispersing agent is dispersed for 5 minutes to obtain a mixture A;
step two, taking a clean container, premixing first deionized water, an organosilicon defoamer 1 and an organosilicon defoamer 2, and then adding the premixed first deionized water, the organosilicon defoamer 1 and the organosilicon defoamer 2 into a mixture A of a dispersing cylinder at a dispersing speed of 1000r/min at a flow rate of 2-3 KG/min; the rotating speed is adjusted to 800r/min, a base material wetting agent, an iron salt drier, a modified urea rheological additive, nepheline powder and zinc powder are sequentially added, the rotating speed is adjusted to 1300r/min, the high-speed dispersion is carried out for 20-30min, a mixture B is obtained, QC detection fineness of the mixture B is less than 30, and the drawing plate has no shrinkage cavity;
and thirdly, adjusting the rotating speed to 800r/min, sequentially adding the second deionized water, the associative polyurethane thickener and the silicate rheological additive into a dispersing cylinder, and stirring at a medium speed for 20-30min until the scraping plate has no shrinkage cavity, so as to prepare the transparent main paint.
Example 2:
the curing agent is prepared by mixing the following raw materials in percentage by weight: 40% of HDI type aqueous curing agent DNW5500, 59.8% of IPDI type aqueous curing agent OS9402 and 0.2% of dehydrating agent.
Comparative example 2-1:
the curing agent is prepared by mixing the following raw materials in percentage by weight: 80% of HDI type water-based curing agent 268, 19.8% of high-boiling-point slow-drying solvent PMA and 0.2% of dehydrating agent.
Comparative example 2-2:
the curing agent is prepared by mixing the following raw materials in percentage by weight: 80% of HDI type water-based curing agent 305, 19.8% of high-boiling-point slow-drying solvent PGDA and 0.2% of dehydrating agent.
The preparation of the curing agent was carried out according to the following preparation method by using example 2 and comparative examples 2-1, 2-2, and the specific steps are as follows:
step A, taking a special clean container, sequentially adding an HDI type water-based curing agent, an IPDI type water-based curing agent and a dehydrating agent into a dispersing cylinder, starting a dispersing machine, uniformly stirring at 800r/min, and stirring for 10 minutes to obtain the curing agent;
and B, taking a clean packaging tank, flushing nitrogen N2, filling the mixed curing agent into the tank, and immediately sealing for later use.
The main paint is prepared under the same experimental condition: the curing agent is 2:1, the experimental conditions are as follows:
drying temperature: room temperature (20-25 ℃);
drying for 30min, and baking at 40deg.C for 16 hr;
a substrate: rubber wood solid wood.
The example 1, the comparative examples 1-1, 1-2, 1-3 and the example 2, the comparative examples 2-1, 2-2 were cross-compounded and the comparative tests gave different performance results as shown in the following table:
note that: the score 0-5, "5" indicates best and "0" indicates worst.
As can be seen by combining the test results of the table, the embodiment 1 is matched with the embodiments of different curing agents, other performance performances except hardness are optimal, and the requirements of high fullness, no prickly heat caused by one thick coating and no influence on transparency caused by heavy coating are met; example 2, with different main paints, has better activation period performance than examples 2-1 and 2-2, and can be used for a longer time; thus, example 1+example 2 works best.
The invention also discloses application of the bio-based thick coatable aqueous double-component transparent primer, the viscosity of the primer prepared by the aqueous double-component transparent primer is 88-96KU, the solid content is 35+/-2%, the PH value is 7, the construction mode is manual diaphragm pump spraying, the coating weight is 180-220 g/square meter, the drying mode adopts normal temperature leveling for 2-3h, and the baking is carried out for 12-16h at 35-40 ℃.
In addition, the waterborne polyurethane modified alkyd resin AKD2734, ferric salt drier 1101, nepheline powder Finex12, silicate rheological additive BYKS482 and curing agent DNW5500+OS9402 used in the invention are the most effective; with the development of technology, newly developed raw materials have the possibility of replacing the materials, so that the materials can be replaced, and the improvement and upgrading of the primer formulation in the later stage are facilitated.
Claims (9)
1. The preparation of the bio-based thick coatable aqueous two-component transparent primer is characterized in that the transparent primer comprises a main paint and a curing agent 2:1, wherein the main paint is prepared by mixing the following raw materials in percentage by weight:
65 to 55 percent of water-based polyurethane modified alkyd resin,
0.2 to 0.4 percent of wetting dispersant,
16 to 22 percent of deionized water,
1.3 to 0.8 percent of organic silicon defoamer,
2.3 to 0.8 percent of organic silicon defoamer,
0.3 to 0.8 percent of base material wetting agent,
0.3 to 0.8 percent of ferrite drier,
0.1 to 0.3 percent of modified urea rheological additive,
3 to 10 percent of nepheline powder,
zinc powder 0.5-2%,
0.2 to 0.4 percent of associative polyurethane thickener,
silicate rheological auxiliary agent 1-3%;
the curing agent is prepared by mixing the following raw materials in percentage by weight:
40% of HDI type water-based curing agent,
59.8% of IPDI type water-based curing agent,
0.2% of dehydrating agent.
2. The preparation of a bio-based thick coatable aqueous two-component clear primer according to claim 1, wherein silicone defoamer 1 is TEGO902W and silicone defoamer 2 is BYK022.
3. The method for preparing the bio-based thick coatable aqueous two-component transparent primer according to claim 1, wherein the deionized water is divided into a first deionized water and a second deionized water, the first deionized water accounts for 1% -2%, and the second deionized water accounts for 15% -20%.
4. Preparation of a bio-based thick coatable aqueous two-component clear primer according to claim 3, characterized in that the main paint is prepared by the steps of:
firstly, a special clean container is taken to add waterborne polyurethane modified alkyd resin into a dispersing cylinder, a dispersing machine is started to stir at 500r/min, then a dispersing agent is wetted, the rotating speed is adjusted to 1000r/min, and the dispersing agent is dispersed for 5 minutes to obtain a mixture A;
step two, taking a clean container, premixing first deionized water, an organosilicon defoamer 1 and an organosilicon defoamer 2, and then adding the premixed first deionized water, the organosilicon defoamer 1 and the organosilicon defoamer 2 into a mixture A of a dispersing cylinder at a dispersing speed of 1000r/min at a flow rate of 2-3 KG/min; the rotating speed is adjusted to 800r/min, a base material wetting agent, an iron salt drier, a modified urea rheological additive, nepheline powder and zinc powder are sequentially added, the rotating speed is adjusted to 1300r/min, the high-speed dispersion is carried out for 20-30min, a mixture B is obtained, QC detection fineness of the mixture B is less than 30, and the drawing plate has no shrinkage cavity;
and thirdly, adjusting the rotating speed to 800r/min, sequentially adding the second deionized water, the associative polyurethane thickener and the silicate rheological additive into a dispersing cylinder, and stirring at a medium speed for 20-30min until the scraping plate has no shrinkage cavity, so as to prepare the transparent main paint.
5. The preparation of the bio-based thick coatable aqueous two-component clear primer according to claim 1, wherein the preparation of the curing agent comprises the steps of:
step A, taking a special clean container, sequentially adding an HDI type water-based curing agent, an IPDI type water-based curing agent and a dehydrating agent into a dispersing cylinder, starting a dispersing machine, uniformly stirring at 800r/min, and stirring for 10 minutes to obtain the curing agent;
and B, taking a clean packaging tank, flushing nitrogen N2, filling the mixed curing agent into the tank, and immediately sealing for later use.
6. The preparation of a bio-based thick coatable aqueous two-component clear primer according to claim 1, wherein the HDI type aqueous curing agent is DNW5500 and the IPDI type aqueous curing agent is OS9402.
7. The preparation of a bio-based thick coatable aqueous two-component clear primer according to claim 1, wherein the clear primer has a solids content of 35 ± 2%, the clear primer has a viscosity of 88-96KU, and the clear primer has a PH of 7.
8. Use of the biobased thick coatable aqueous two-component clear primer according to any one of claims 1-7 in solid wood furniture coating.
9. The use according to claim 7, wherein the transparent primer is applied by spraying with a manual diaphragm pump, the coating amount is 180-220 g/square meter, the drying is carried out at normal temperature for 2-3h, and the baking is carried out at 35-40 ℃ for 12-16h.
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