Water-oil universal type nano color paste and preparation method thereof

Abstract

The application relates to the technical field of nano color paste, and discloses a water-oil universal type nano color paste and a preparation method thereof, which is composed of 30-40 parts of water-oil modified polyurethane, 3-5 parts of polyethylene glycol monomethyl ether, 2-6 parts of polyether modified maleic anhydride copolymer, 6-10 parts of polydimethylsiloxanol, 5-8 parts of glycerol, 0.3-0.6 parts of isobutyl alcohol amine, 35-50 parts of deionized water, 20-30 parts of pigment color powder and 10-20 parts of ethanol in terms of weight fraction. The water-oil modified polyurethane has certain hydrophobic performance (provided by an alkyl long chain) and certain hydrophilic performance (provided by sodium sulfonate), the balance of the two performances makes the water-oil modified polyurethane play a stabilizing role in a water-oil mixture, and the water-oil modified polyurethane has good storage stability. The water-oil modified polyurethane has easy preparation, wide application range, is suitable for most oil-based paints and water-based paints on the market, has extremely high transparency, permeability, and excellent effects on coloring and wetting of wood.

Description

Technical Field

[0001] This invention relates to the field of nano-color paste technology, specifically to a water- and oil-based nano-color paste and its preparation method. Background Technology

[0002] Color paste is an important type of pigment concentrate, prepared through various pigment surface treatments, encapsulation techniques, and specific processing methods. With continuous socio-economic development, the color paste market is expanding globally, projected to reach $1.2 billion by 2025. This is primarily driven by increasing demand from industries such as coatings, inks, and plastics, as well as the application of various new materials. Traditional color pastes are mainly divided into two categories: water-based and oil-based. Water-based color pastes are pigment and filler pastes dispersed with surfactants using water as a medium; oil-based color pastes use pure oil as a medium. However, water-based color pastes can only be used in water-based systems, and oil-based color pastes can only be used in oil-based systems, limiting their application scope. In actual production, many companies need to produce both oil-based and water-based products simultaneously, requiring separate purchases of water-based and oil-based color pastes. This not only increases costs but also creates inconvenience in use and management. Furthermore, traditional oil-based color pastes use large amounts of oil-based solvents and resins in their production process, resulting in high production costs, environmental pollution, and harm to the health of production workers.

[0003] The requirements for color pastes are becoming increasingly stringent across various industries. Currently, the wood coatings market offers a wide variety of coatings, such as water-based two-component wood coatings, water-based one-component wood coatings, oil-based PU wood coatings, oil-based NC wood coatings, oil-based PE wood coatings, oil-based UV wood coatings, and oil-based acrylic wood coatings. Traditional color pastes are semi-finished products made by dispersing pigments or fillers in resins or carriers, and cannot be used alone. Typically, oil-based color pastes can only be used in oil-based wood coatings, and water-based color pastes can only be used in water-based wood coatings, causing significant inconvenience to the market. While some patent applications have attempted to prepare universal water-oil color pastes, these applications have several problems. For example, some patent applications still use organic solvents such as propylene glycol and pyrrolidone as the main solvent, which are environmentally unfriendly and have high production costs. This application prepares water-oil modified polyurethane and uses a reasonable high-speed dispersion system to ensure that the pigments are fully dispersed in the water-oil system, thus achieving universal water-oil compatibility. Furthermore, this invention uses water as the main solvent, which has environmentally friendly and non-toxic technical effects, reducing the production cost of the color paste. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art and to provide a water- and oil-based nano pigment and its preparation method. This breaks the traditional application method of pigments, can be well compatible with water-based and oil-based wood coatings on the market, and adopts a nano-manufacturing process to control the particle size of the pigment to 200-300nm. Compared with traditional pigments, it has better coloring power, brightness, penetration and compatibility, and can be well applied in high-end customized wood coatings.

[0005] This invention is achieved through the following technical solution:

[0006] A method for preparing a water-oil universal nano-color paste is carried out according to the following steps: 30-40 parts by weight of water-oil modified polyurethane, 3-5 parts by weight of dispersant and 2-6 parts by weight of dispersant B are added to a high-speed disperser and dispersed evenly at 800-1000 r / min. Then, 6-10 parts by weight of organosilicon surfactant, 5-8 parts by weight of humectant and 0.3-0.6 parts by weight of neutralizer are added and dispersed at 500-600 r / min for 5-15 min. Next, 35-50 parts by weight of deionized water and 20-30 parts by weight of pigment powder are added and dispersed at 1200-1500 r / min for 20-30 min. The uniformly mixed color paste is placed in a nano-level horizontal grinder for grinding. Finally, 10-20 parts by weight of ethanol are added to clean the color paste and the grinding equipment to obtain the water-oil universal nano-color paste.

[0007] The silicone surfactant is polydimethylsiloxane alcohol, the humectant is glycerin, and the neutralizer is isobutanolamine.

[0008] Preferably, dispersant A is polyethylene glycol monomethyl ether; dispersant B is a polyether-modified maleic anhydride copolymer, obtained by esterification reaction of polyether 1009 and styrene-maleic anhydride copolymer.

[0009] Preferably, the pigment is any one of titanium dioxide, carbon black, phthalocyanine blue, iron oxide yellow, anthraquinone red, isoindoline yellow, or benzidine yellow.

[0010] Preferably, the preparation method of water-oil modified polyurethane is carried out according to the following steps:

[0011] Step (1): Under a nitrogen atmosphere, add 100 parts by weight of long-chain amino alcohol and toluene to a reaction flask, stir evenly, then add 145-180 parts of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate and 2-5 parts of catalyst, stir the reaction, filter after the reaction is completed, purify by column chromatography (ethyl acetate / petroleum ether = 1:3), and dry to obtain sodium sulfonate-based long-chain diol.

[0012] Step (2): Under a nitrogen atmosphere, add 100 parts by weight of epoxidized soybean oil and 40-60 parts by weight of sodium sulfonate-based long-chain diol to the reaction flask. Add 10-15 drops of fluoroboric acid while stirring vigorously. After the reaction is completed, cool to room temperature, extract with ethyl acetate and deionized water, concentrate the organic phase, and obtain modified soybean oil polyol.

[0013] Step (3): Under a nitrogen atmosphere, add 40-50 parts by weight of isophorone diisocyanate, 70-90 parts by weight of vacuum-dehydrated polycaprolactone diol, and 10-30 parts by weight of modified soybean oil polyol to a reaction flask equipped with a reflux condenser and a thermometer. Heat to 75-90℃ and react for 2-4 hours. Add 4-8 parts by weight of stannous octoate and continue reacting for 1-3 hours. Add 5-8 parts by weight of 1,4-butanediol and react until -NCO reaches the theoretical value (titrated by di-n-butylamine method). Cool to 35-50℃, add acetone to adjust the viscosity, add 2-10 parts by weight of sodium sulfonate-based long-chain diol and react for 0.5-1 hours. Adjust the pH value with triethylamine, add deionized water and stir at high speed for 10-20 minutes. Distill off acetone under reduced pressure to obtain water-oil modified polyurethane.

[0014] Preferably, the long-chain amino alcohol in step (1) is any one of 8-amino-1-octanol, 10-amino-1-n-decanol, or 12-amino-1-dodecanol.

[0015] Preferably, the catalyst in step (1) is tetrabutylammonium bromide or benzyltriethylammonium chloride.

[0016] Preferably, the reaction temperature in step (1) is 60-80℃ and the reaction time is 3-8h.

[0017] Preferably, the reaction temperature in step (2) is 100-120℃ and the reaction time is 1-3h.

[0018] Preferably, in step (3), the pH value is adjusted to 8-9.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] (1) Polyurethane structures typically contain hydrophilic polyol chains and hydrophobic isocyanate chains. The alternating arrangement of these two chain segments gives polyurethane both certain hydrophilicity and certain hydrophobicity, making it possible for water and oil to be miscible. By introducing nonpolar alkyl long chains with certain hydrophobicity into the molecular structure of epoxidized soybean oil, on the one hand, their spatial arrangement in the molecular chain can form an interlaced arrangement structure, increasing the interaction force between the long-chain alkyl and polyurethane molecules, which helps to disperse and stabilize the nano-color paste. On the other hand, it can enhance the hydrophobic properties of polyurethane, making it easier for polyurethane to interact with oily substances, thereby achieving water and oil miscibility. Sodium sulfonate is a strong acid and strong base salt with good water solubility, making it easier for polyurethane to interact with water molecules, thereby achieving water and oil miscibility. Therefore, water-oil modified polyurethane has both certain hydrophobic properties (provided by the alkyl long chains) and certain hydrophilic properties (provided by sodium sulfonate). The balance of these two properties enables polyurethane to play a stabilizing role in water-oil mixtures and has good storage stability.

[0021] (2) The nano pigment provided by the present invention has good storage stability. After being stored at 50℃ and -50℃ for a month, the particle size does not change significantly. The water-oil universal nano pigment is easy to prepare and has a wide range of applications. It can be used not only for most oil-based paints and water-based paints on the market, but also has extremely high transparency and permeability in practical applications. It has excellent effects on wood coloring and wetting, and can be used for coloring and color repair of high-transparency and semi-transparent coatings.

[0022] (3) The water-oil universal nano pigment prepared in this application has good compatibility with common solvents such as water, ethanol, butyl acetate and xylene. It also has excellent compatibility and suspension properties with common PU paint, NC paint, UV paint, PE paint, as well as water-based single-component and water-based two-component paints. In addition, it has excellent performance in wood base coloring. In combination with the current market development trend, the water-oil universal nano pigment of this application can not only break the constraints of traditional pigment use, but also effectively save customers warehouse inventory and provide convenience for on-site construction. Attached Figure Description

[0023] Figure 1 This is a compatibility test diagram of the water-oil universal nano-color paste prepared in Example 2 with the solvent.

[0024] Figure 2 Comparative test results of adding water-based irradiant main agent to both water- and oil-based universal nano-color paste and ordinary water-based irradiant color paste.

[0025] Figure 3 Comparative test results of adding oil-based ester main agent to water-oil universal nano-color paste and ordinary oil-based ester color paste. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] Unless otherwise stated, all raw materials and reagents used in this application are commercially available products or can be prepared by known methods.

[0028] 8-Amino-1-octanol, CAS number 19008-71-0.

[0029] 10-Amino-1-n-Decanol, CAS number 23160-46-5.

[0030] 12-Amino-1-dodecanool, CAS number 67107-87-3.

[0031] Sodium 3-allyloxy-2-hydroxy-1-propanesulfonate, CAS number 52556-42-0.

[0032] Epoxidized soybean oil, epoxy value 6.1%, purchased from Nantong Haierma Vegetable Oil Co., Ltd.

[0033] Example 1

[0034] (1) Under a nitrogen atmosphere, 10 g of 8-amino-1-octanol and 600 mL of toluene were added to a reaction flask. After stirring until homogeneous, 16.5 g of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate and 3 g of tetrabutylammonium bromide were added. The mixture was reacted at 70 °C for 5 h, filtered, and purified by column chromatography (ethyl acetate / petroleum ether = 1:3). After drying, sodium sulfonate-based long-chain diol was obtained. The preparation reaction formula is as follows:

[0035]

[0036] (2) Under a nitrogen atmosphere, 100g of epoxidized soybean oil and 40g of sodium sulfonate-based long-chain diol were added to a reaction flask. 12 drops of fluoroboric acid were added under vigorous stirring. The reaction was carried out at 110℃ for 2 hours. After cooling to room temperature, the mixture was extracted with ethyl acetate and deionized water. The organic phase was concentrated to obtain modified soybean oil polyol.

[0037] (3) Under a nitrogen atmosphere, 45g of isophorone diisocyanate, 90g of vacuum-dehydrated polycaprolactone diol and 10g of modified soybean oil polyol were added to a reaction flask equipped with a reflux condenser and a thermometer. The mixture was heated to 85℃ and reacted for 3h. 6g of stannous octoate was added and the reaction was continued for 2h. 7g of 1,4-butanediol was added and the reaction was continued until -NCO reached the theoretical value (titrated by di-n-butylamine method). The mixture was cooled to 45℃ and acetone was added to adjust the viscosity. 2g of sodium sulfonate-based long-chain diol was added and the reaction was continued for 0.5h. Triethylamine was added to adjust the pH to 8. Deionized water was added and the mixture was stirred at high speed for 15min. The acetone was removed by vacuum distillation to obtain water-oil modified polyurethane.

[0038] (4) Add 35g of water-oil modified polyurethane, 4g of polyethylene glycol monomethyl ether and 6g of polyether modified maleic anhydride copolymer to a high-speed disperser and disperse evenly at 900r / min. Then add 8g of polydimethylsiloxane alcohol, 6g of glycerol and 0.5g of isobutanolamine and disperse at 550r / min for 10min. Then add 45g of deionized water and 25g of titanium dioxide and disperse at 1350r / min for 25min. Place the evenly mixed pigment paste in a nano-level horizontal grinder for grinding. Finally add 15g of ethanol to clean the pigment paste and grinding equipment to obtain a water-oil universal nano pigment paste.

[0039] Example 2

[0040] (1) Under a nitrogen atmosphere, 10 g of 10-amino-1-n-decyl alcohol and 500 mL of toluene were added to a reaction flask. After stirring evenly, 14.5 g of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate and 2 g of benzyltriethylammonium chloride were added. The reaction was carried out at 80 °C for 3 h. After filtration, the product was purified by column chromatography (ethyl acetate / petroleum ether = 1:3). After drying, sodium sulfonate-based long-chain diol was obtained.

[0041] (2) Under a nitrogen atmosphere, 100g of epoxidized soybean oil and 50g of sodium sulfonate-based long-chain diol were added to a reaction flask. 10 drops of fluoroboric acid were added under vigorous stirring. The reaction was carried out at 120°C for 1 hour. The mixture was cooled to room temperature, extracted with ethyl acetate and deionized water, and the organic phase was concentrated to obtain modified soybean oil polyol.

[0042] (3) Under a nitrogen atmosphere, 40g of isophorone diisocyanate, 80g of vacuum-dehydrated polycaprolactone diol and 230g of modified soybean oil polyol were added to a reaction flask equipped with a reflux condenser and a thermometer. The mixture was heated to 90℃ and reacted for 2h. 4g of stannous octoate was added and the reaction was continued for 1h. 5g of 1,4-butanediol was added and the reaction was continued until -NCO reached the theoretical value (titrated by di-n-butylamine method). The mixture was cooled to 35℃ and acetone was added to adjust the viscosity. 6g of sodium sulfonate-based long-chain diol was added and the reaction was continued for 1h. Triethylamine was added to adjust the pH to 9. Deionized water was added and the mixture was stirred at high speed for 10min. The acetone was removed by vacuum distillation to obtain water-oil modified polyurethane.

[0043] (4) Add 30g of water-oil modified polyurethane, 3g of polyethylene glycol monomethyl ether and 6g of polyether modified maleic anhydride copolymer to a high-speed disperser and disperse evenly at 1000r / min. Then add 6g of polydimethylsiloxane alcohol, 5g of glycerol and 0.3g of isobutanolamine and disperse at 600r / min for 5min. Then add 35g of deionized water and 20g of iron oxide yellow and disperse at 1500r / min for 20min. Place the evenly mixed pigment paste in a nano-level horizontal grinder for grinding. Finally add 10g of ethanol to clean the pigment paste and grinding equipment to obtain a water-oil universal nano pigment paste.

[0044] Example 3

[0045] (1) Under a nitrogen atmosphere, 10 g of 12-amino-1-dodecaneol and 650 mL of toluene were added to a reaction flask. After stirring evenly, 18 g of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate and 5 g of tetrabutylammonium bromide were added. The reaction was carried out at 60 °C for 8 h. After filtration, the product was purified by column chromatography (ethyl acetate / petroleum ether = 1:3). After drying, sodium sulfonate-based long-chain diol was obtained.

[0046] (2) Under a nitrogen atmosphere, 100g of epoxidized soybean oil and 60g of sodium sulfonate-based long-chain diol were added to a reaction flask. 15 drops of fluoroboric acid were added under vigorous stirring. The reaction was carried out at 100℃ for 3h. After cooling to room temperature, the mixture was extracted with ethyl acetate and deionized water. The organic phase was concentrated to obtain modified soybean oil polyol.

[0047] (3) Under a nitrogen atmosphere, 50g of isophorone diisocyanate, 70g of vacuum-dehydrated polycaprolactone diol and 30g of modified soybean oil polyol were added to a reaction flask equipped with a reflux condenser and a thermometer. The mixture was heated to 75°C and reacted for 4 hours. 8g of stannous octoate was added and the reaction was continued for 3 hours. 8g of 1,4-butanediol was added and the reaction was continued until -NCO reached the theoretical value (titrated by di-n-butylamine method). The mixture was cooled to 35°C and acetone was added to adjust the viscosity. 10g of sodium sulfonate-based long-chain diol was added and the reaction was continued for 1 hour. Triethylamine was added to adjust the pH to 8. Deionized water was added and the mixture was stirred at high speed for 20 minutes. The acetone was removed by vacuum distillation to obtain water-oil modified polyurethane.

[0048] (4) Add 40g of water-oil modified polyurethane, 5g of polyethylene glycol monomethyl ether and 6g of polyether modified maleic anhydride copolymer to a high-speed disperser and disperse evenly at 800r / min. Then add 10g of polydimethylsiloxane alcohol, 8g of glycerol and 0.6g of isobutanolamine and disperse at 500r / min for 15min. Then add 50g of deionized water and 30g of phthalocyanine blue and disperse at 1200r / min for 30min. Place the evenly mixed color paste in a nano-level horizontal grinder for grinding. Finally add 20g of ethanol to clean the color paste and grinding equipment to obtain a water-oil universal nano color paste.

[0049] Comparative Example 1

[0050] (1) Under a nitrogen atmosphere, add 100g of epoxidized soybean oil and 40g of isooctanol (CAS No. 26952-21-6, structural formula: ...) to a reaction flask. ), add 12 drops of fluoroboric acid under vigorous stirring, react at 110℃ for 2 hours, cool to room temperature, extract with ethyl acetate and deionized water, concentrate the organic phase, and obtain soybean oil polyol.

[0051] (2) Under a nitrogen atmosphere, 45g of isophorone diisocyanate, 90g of vacuum-dehydrated polycaprolactone diol and 10g of soybean oil polyol were added to a reaction flask equipped with a reflux condenser and a thermometer. The mixture was heated to 85°C and reacted for 3 hours. 6g of stannous octoate was added and the reaction was continued for 2 hours. 7g of 1,4-butanediol was added and the reaction was continued until -NCO reached the theoretical value (titrated by di-n-butylamine method). The mixture was cooled to 45°C, acetone was added to adjust the viscosity, triethylamine was added to adjust the pH to 8, deionized water was added and stirred at high speed for 15 minutes. The acetone was removed by vacuum distillation to obtain modified polyurethane.

[0052] (3) Add 35g of modified polyurethane, 4g of polyethylene glycol monomethyl ether and 6g of polyether-modified maleic anhydride copolymer to a high-speed disperser and disperse evenly at 900r / min. Then add 8g of polydimethylsiloxane alcohol, 6g of glycerol and 0.5g of isobutanolamine and disperse at 550r / min for 10min. Then add 45g of deionized water and 25g of titanium dioxide and disperse at 1350r / min for 25min. Place the evenly mixed color paste in a nano-scale horizontal grinder for grinding. Finally add 15g of ethanol to clean the color paste and grinding equipment to obtain nano-color paste.

[0053] Particle size testing: Following the method in GB / T 18854-2015, 20g of the pigment paste from each grinding stage was taken and analyzed using an optical particle size analyzer. 95 Particle size testing.

[0054] Storage stability test: The prepared nano-color paste was placed at 50℃ and -50℃ for one month respectively, and the change in particle size was tested.

[0055] Table 1. Particle size and storage stability tests

[0056]

[0057] As can be seen from the test results in the table above, the nano-color paste prepared in the example has a good dispersion effect, and the particle size does not change much after being stored in alternating hot and cold conditions for one month, indicating that it has good storage stability. This is because the polyurethane in the example introduces long-chain alkyl groups, whose spatial arrangement in the molecular chain can form an interlaced arrangement structure. This structure can increase the interaction force between the long-chain alkyl groups and the polyurethane molecules, which helps to disperse and stabilize the nano-color paste. Polyurethane structures typically contain hydrophilic polyol chains and hydrophobic isocyanate chains. This alternating arrangement of these two chain segments gives polyurethane both hydrophilic and hydrophobic properties, enabling water-oil miscibility. Introducing hydrophobic nonpolar alkyl long chains into the molecular structure of epoxidized soybean oil enhances the hydrophobic properties of polyurethane, making it easier for it to interact with oily substances, thus achieving water-oil miscibility. Sodium sulfonate, a strong acid and strong base salt with excellent water solubility, further facilitates the interaction of polyurethane with water molecules, thus achieving water-oil miscibility. Therefore, water-oil modified polyurethane possesses both hydrophobic properties (provided by the alkyl long chains) and hydrophilic properties (provided by sodium sulfonate). This balance allows polyurethane to play a stabilizing role in water-oil mixtures, exhibiting good storage stability. In contrast, the polyurethane in Comparative Example 1, without water-oil modification and lacking sodium sulfonate salt and alkyl long chains, shows significant particle size variation and poor storage performance.

[0058] Compatibility test: The experimental environment was in accordance with GB / T 9278-2008, and the sampling was in accordance with the relevant provisions of GB / T3186-2006.

[0059] (1) Solvent compatibility test: The nano pigment prepared in Example 2 was added to deionized water, ethanol, butyl ester, ethyl ester and xylene respectively, with the addition amounts being 5%, 50% and 90% respectively, and the solvent compatibility test was carried out.

[0060] Table 2 Solvent Compatibility Test

[0061]

[0062] From Table 2 and Appendix Figure 1 It is known that the water-oil universal nano-color paste prepared in this application has good compatibility in water, alcohol, ester and benzene solvents, and is not easy to separate into layers.

[0063] (2) Base material compatibility test: The nano pigments prepared in Example 2 were added to PU paint, NC paint, UV paint, PE paint, water-based single-component paint and water-based two-component paint respectively, with addition amounts of 10%, 20% and 30% respectively, and base material compatibility test was conducted.

[0064] Table 3 Solvent compatibility test

[0065]

[0066] As shown in Table 3, the water-oil universal nano-color paste prepared in this application is miscible in PU paint, NC paint, UV paint, PE paint, water-based single-component paint and water-based two-component paint, and no particles are precipitated.

[0067] Thermostatic performance test of nano-pigment: The nano-pigment prepared in Example 2 was divided into two portions, each 500g, and placed into 500mL glass bottles with about 10% space left inside. After sealing, one portion of the sample was placed in a constant temperature oven at (50±2)℃ and labeled as thermostatic pigment; the other portion of the sample was placed in an experimental environment at 25-35℃ and labeled as room temperature pigment. After 7 days, the thermostatic pigment was taken out and placed in a specified room temperature environment for 3 hours.

[0068] (1) Comparison of color change due to heat storage: Prepare 100g samples of base white paint (self-drying type) and heat storage color paste and room temperature color paste respectively, according to the ratio of color paste: base white paint 5:95, and label them as heat storage color paint and room temperature color paint respectively. Take a small amount of room temperature color paint and heat storage color paint respectively, place them on black and white card paper, and use a wet film preparation device (250um) to prepare two uniform opaque coatings with a width of not less than 25mm and a contact edge length of not less than 40mm on the black and white card paper. Place the prepared color paint samples in room temperature to dry for 24h, and test them with a colorimeter according to the dilution method in GB / T 5211.1-1988 7.4.

[0069] Table 4 Color difference data during thermal storage of color pastes

[0070] Color paste serial number Water-oil universal nano pigment △L* 0.11 △a* 0.05 △b* 0.12 △E* 0.17 △Y* -0.83 △C* 1.05 Viscosity change +3KU

[0071] (2) Paint thermal storage test

[0072] The nano-color paste prepared in Example 2 was added to PU base white paint (self-drying type) and water-based base white paint (self-drying type) respectively. 1 kg of paint samples were prepared for each sample at a ratio of color paste to base white paint of 5:95. These samples were divided into two portions and placed in 500 mL glass bottles, leaving approximately 10% space inside. After sealing, one sample was placed in a constant temperature oven at (50±2)℃ and labeled as heat-storage water-based paint and heat-storage PU paint, respectively. The other sample was placed in an experimental environment at 25-35℃ and labeled as room temperature water-based paint and room temperature PU paint. After 7 days, the heat-storage water-based paint and heat-storage PU paint were removed and placed in a specified room temperature environment for 3 hours. Take small amounts of room temperature water-based paint (room temperature PU paint) and heat-storage water-based paint (room temperature PU paint) respectively, and place them on black and white cardstock. Use a wet film preparation device (250um) to prepare two uniform opaque coatings with a width of not less than 25mm and a contact edge length of not less than 40mm on the black and white cardstock. Place the prepared paint samples in room temperature to dry for 24 hours, and test them with a colorimeter according to the dilution method of GB / T 5211.1-19887.4.

[0073] Table 5. Thermal Storage Stability Test of Color Pastes

[0074] Color paste serial number PU base white paint Water-based base white paint △L* 0.14 0.16 △a* 0.14 0.18 △b* 0.10 0.12 △E* 0.22 0.27 △Y* -0.95 -1.01 △C* 1.01 0.98 Viscosity change -3KU -5KU

[0075] As shown in Tables 4 and 5, the water-oil universal nano-pigment prepared in this application exhibits excellent resistance to discoloration and stability during storage, with ΔE≦0.5, and meets the market requirements for pigment storage and use.

[0076] The water-oil universal nano-pigment prepared in this application is easy to prepare and has a wide range of applications. It can be used not only for most oil-based paints and water-based paints on the market, but also has extremely high transparency and permeability in practical applications. It has excellent effects on wood staining and wetting, and can be used for staining and color correction in high-transparency and semi-transparent coating decoration.

[0077] From the appendix Figure 2 and attached Figure 3 The comparative tests show that the water-oil universal nano-pigment prepared in this application has a stronger ability to reveal wood grain and greater permeability.

[0078] In summary, the water-oil universal nano-color paste prepared in this application exhibits good compatibility with common solvents such as water, ethanol, butyl acetate, and xylene. It also demonstrates excellent compatibility and suspension properties with common PU paints, NC paints, UV paints, PE paints, as well as water-based single-component and water-based two-component paints. Furthermore, it shows excellent performance in wood base coloring. Considering current market trends, the water-oil universal nano-color paste of this application not only breaks the constraints of traditional color paste usage but also effectively saves customers on warehousing inventory and provides convenience for on-site construction.

[0079] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A method for preparing a water-oil universal type nano color paste, characterized in that, The preparation method is carried out according to the following steps: 30-40 parts by weight of water-oil modified polyurethane, 3-5 parts by weight of dispersant A and 2-6 parts by weight of dispersant B are added to a high-speed disperser and dispersed evenly at 800-1000 r / min. Then, 6-10 parts by weight of organosilicon surfactant, 5-8 parts by weight of humectant and 0.3-0.6 parts by weight of neutralizer are added and dispersed at 500-600 r / min for 5-15 min. Then, 35-50 parts by weight of deionized water and 20-30 parts by weight of pigment powder are added and dispersed at 1200-1500 r / min for 20-30 min. The evenly mixed color paste is placed in a nano-level horizontal grinder for grinding. Finally, 10-20 parts by weight of ethanol are added to clean the color paste and grinding equipment to obtain a water-oil universal nano color paste. The organosilicon surfactant is polydimethylsiloxane alcohol, the humectant is glycerin, and the neutralizing agent is isobutanolamine; The dispersant A is polyethylene glycol monomethyl ether; the dispersant B is a polyether-modified maleic anhydride copolymer, which is obtained by esterification reaction of polyether 1009 and styrene-maleic anhydride copolymer. The preparation method of the water-oil modified polyurethane is carried out according to the following steps: Step (1): Under a nitrogen atmosphere, add 100 parts by weight of long-chain amino alcohol and toluene to a reaction flask, stir evenly, add 145-180 parts of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate and 2-5 parts of catalyst, stir the reaction, filter, purify by column chromatography, and dry to obtain sodium sulfonate-based long-chain diol. Step (2): Under a nitrogen atmosphere, add 100 parts by weight of epoxidized soybean oil and 40-60 parts by weight of sodium sulfonate-based long-chain diol to the reaction flask. Add 10-15 drops of fluoroboric acid while stirring vigorously. Stir the reaction and after the reaction is completed, cool to room temperature, extract with ethyl acetate and deionized water, concentrate the organic phase, and obtain modified soybean oil polyol. Step (3): Under a nitrogen atmosphere, add 40-50 parts by weight of isophorone diisocyanate, 70-90 parts by weight of vacuum-dehydrated polycaprolactone diol, and 10-30 parts by weight of modified soybean oil polyol to a reaction flask equipped with a reflux condenser and a thermometer. Heat to 75-90℃ and react for 2-4 hours. Add 4-8 parts by weight of stannous octoate and continue reacting for 1-3 hours. Add 5-8 parts by weight of 1,4-butanediol and react until -NCO reaches the theoretical value. Cool to 35-50℃, add acetone to adjust the viscosity, add 2-10 parts by weight of sodium sulfonate-based long-chain diol and react for 0.5-1 hours. Adjust the pH value with triethylamine, add deionized water and stir at high speed for 10-20 minutes. Remove acetone by vacuum distillation to obtain water-oil modified polyurethane.

2. The preparation method of the water-oil universal nano-color paste according to claim 1, characterized in that, The pigment powder is any one of titanium dioxide, carbon black, phthalocyanine blue, iron oxide yellow, anthraquinone red, isoindoline yellow, or benzidine yellow.

3. The method for preparing the water-oil universal nano-color paste according to claim 1, characterized in that, In step (1), the long-chain amino alcohol is any one of 8-amino-1-octanol, 10-amino-1-n-decanol, or 12-amino-1-dodecanol.

4. The preparation method of the water-oil universal nano-color paste according to claim 1, characterized in that, The catalyst in step (1) is tetrabutylammonium bromide or benzyltriethylammonium chloride.

5. The method for preparing the water-oil universal nano-color paste according to claim 1, characterized in that, The reaction temperature in step (1) is 60-80℃ and the reaction time is 3-8h.

6. The method for preparing the water-oil universal nano-color paste according to claim 1, characterized in that, The reaction temperature in step (2) is 100-120℃ and the reaction time is 1-3h.

7. The method for preparing the water-oil universal nano-color paste according to claim 1, characterized in that, In step (3), the pH value is adjusted to 8-9.

8. A water- and oil-based universal nano-color paste, characterized in that, It is obtained by the preparation method according to any one of claims 1-7.

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