Water-oil universal nano color paste and preparation method thereof

Abstract

The invention relates to the technical field of nano color paste, and discloses water-oil universal nano color paste and a preparation method thereof. The water-oil-modified polyurethane ink is prepared from the following components in parts by weight: 30 to 40 parts of water-oil-modified polyurethane, 3 to 5 parts of methoxypolyethylene glycol, 2 to 6 parts of polyether modified maleic anhydride copolymer, 6 to 10 parts of polydimethylsiloxane alcohol, 5 to 8 parts of glycerol, 0.3 to 0.6 part of isobutanol amine, 35 to 50 parts of deionized water, 20 to 30 parts of pigment toner and 10 to 20 parts of ethanol. The water-oil modified polyurethane has a certain hydrophobic property (provided by an alkyl long chain) and a certain hydrophilic property (provided by sodium sulfonate), the balance of the two properties enables the water-oil modified polyurethane to play a stabilizing role in a water-oil mixture, and the water-oil modified polyurethane has good storage stability; the water-based paint has the advantages of easiness in preparation and wide application range, is suitable for most of oil paint and water paint on the market, has extremely high transparency and permeability, and has excellent effects on coloring and wetting wood.

Description

Technical Field

[0001] The invention relates to the technical field of nano-color paste, in particular to a water-oil universal nano-color paste and a preparation method thereof. Background Art

[0002] Color paste is an important pigment concentrate, which is prepared through different pigment surface treatment, encapsulation and other technologies and through specific processing technology. With the continuous development of social economy, the scale of the color paste market has gradually expanded globally, and it is expected to reach US$1.2 billion in 2025. The main reason is the growing demand in industries such as coatings, inks, and plastics. At the same time, the application of various new materials has also promoted the rapid development of the color paste market. Traditional color pastes are mainly divided into two categories: water-based color pastes and oily color pastes. Water-based color pastes are pigment filler pastes dispersed by adding surfactants with water as the medium; oily color pastes are pure oil as the medium, but water-based color pastes can only be used in water-based systems, and oily color pastes can only be used in oily systems, and the scope of application is limited. In actual production, many companies need to produce oily and water-based products at the same time, so they need to purchase water-based color pastes and oily color pastes separately, which not only increases the cost of the company, but also brings inconvenience in use and management. In addition, traditional oily color pastes use a large amount of oily solvents and resins in the production process, which not only has high production costs, but also pollutes the environment and harms the health of production workers.

[0003] The requirements for color pastes in various industries are getting higher and higher. At present, in the wood coating market, there are many kinds 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, oil-based acrylic wood coatings, etc. Traditional color pastes are semi-finished products made by dispersing pigments or fillers in resins or carriers, and cannot be used alone. Usually, oily color pastes can only be used in oily wood coatings, and water-based color pastes can be used in water-based wood coatings, which brings great inconvenience to the market. At present, there are some patent applications for attempting to prepare water-oil universal color pastes, but these applications have some problems. For example, the main solvents used in some patent applications are still organic substances such as propylene glycol and pyrrolidone, which are not environmentally friendly and have high production costs. The present application prepares water-oil modified polyurethane, and through a reasonable high-speed dispersion system, the pigment can be fully dispersed in the water-oil system, thereby achieving water-oil universality. At the same time, the present invention uses water as the main solvent, which has environmentally friendly and non-toxic technical effects and reduces the production cost of the color paste. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art, and to provide a water-oil universal nano-color paste and a preparation method thereof, which breaks the traditional color paste application method, can be well dissolved with water-based and oily wood paints on the market, and adopts a nano-production process to control the color paste particle size to 200-300nm. It has better tinting power, brightness, permeability, solubility, etc. than traditional color paste, and can be well used in high-end customization such as wood coating.

[0005] The present invention is achieved through the following technical solutions:

[0006] The invention discloses a method for preparing a water-oil universal nano-color paste according to the following steps: adding 30-40 parts of water-oil modified polyurethane, 3-5 parts of dispersant and 2-6 parts of dispersant B by weight into a high-speed dispersing machine, dispersing them uniformly at 800-1000 r / min, then adding 6-10 parts of silicone surfactant, 5-8 parts of moisturizing agent and 0.3-0.6 parts of neutralizing agent, dispersing them at 500-600 r / min for 5-15 minutes, then adding 35-50 parts of deionized water and 20-30 parts of pigment toner, dispersing them at a high speed of 1200-1500 r / min for 20-30 minutes, placing the uniformly mixed color paste in a nano-level horizontal grinder for grinding, and finally adding 10-20 parts of ethanol to clean the color paste and the grinding equipment to obtain the water-oil universal nano-color paste.

[0007] The organic silicon surfactant is polydimethylsiloxane alcohol, the moisturizing agent is glycerin, and the neutralizing agent is isobutanolamine.

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

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

[0010] Preferably, the preparation method of the 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 a 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 a catalyst, stir to react, filter after the reaction, purify by column chromatography (ethyl acetate / petroleum ether=1:3), and dry to obtain a 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 into a reaction flask, add 10-15 drops of fluoroboric acid under vigorous stirring, stir to react, and after the reaction is completed, cool to room temperature, extract with ethyl acetate and deionized water, and concentrate the organic phase to obtain a modified soybean oil polyol.

[0013] Step (3), under a nitrogen atmosphere, add 40-50 parts by weight of isophorone diisocyanate, 70-90 parts of vacuum dehydrated polycaprolactone diol and 10-30 parts of modified soybean oil polyol to a reaction flask equipped with a reflux condenser and a thermometer, heat to 75-90° C. and react for 2-4 hours, add 4-8 parts of stannous octoate, continue to react for 1-3 hours, add 5-8 parts of 1,4-butanediol and react until -NCO reaches a theoretical value (titrated by di-n-butylamine method), cool to 35-50° C., add acetone to adjust the viscosity, add 2-10 parts of sodium sulfonate-based long-chain diol and react for 0.5-1 hour, adjust the pH value with triethylamine, add deionized water and stir at high speed for 10-20 minutes, and distill dealcoholized acetone under reduced pressure to obtain a 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, in step (1), the reaction temperature is 60-80° C. and the reaction time is 3-8 h.

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

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

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The structure of polyurethane usually contains hydrophilic polyol chains and hydrophobic isocyanate chains. The alternating arrangement of these two chain segments makes polyurethane both hydrophilic and hydrophobic, which provides the possibility for water-oil miscibility. By introducing non-polar 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 a staggered arrangement structure, increase the interaction force between the long-chain alkyl and polyurethane molecules, and help the dispersion and stability of nano-color paste. On the other hand, it can enhance the hydrophobicity of polyurethane, making it easier for polyurethane to interact with oily substances, thereby achieving water-oil miscibility. Sodium sulfonate is a strong acid and strong alkaline salt with good water solubility, making it easier for polyurethane to interact with water molecules, thereby achieving water-oil miscibility. Therefore, water-oil modified polyurethane has both certain hydrophobicity (provided by the alkyl long chain) and certain hydrophilicity (provided by the 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-color paste provided by the present invention has good storage stability. After being stored alternately at 50°C and -50°C for one month, the particle size does not change significantly. The water-oil universal nano-color paste is easy to prepare and has a wide range of applications. It is not only suitable 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 coloring and wetting wood, and can be used for rubbing and repairing the color of high-transparent and semi-transparent paint decorations.

[0022] (3) The water-oil universal nano-color paste prepared in the present application has good solubility in common solvents such as water, ethanol, butyl ester, and xylene, and has excellent solubility and suspension with common PU paint, NC paint, UV paint, PE paint, and water-based single-component and water-based two-component paints; in addition, it also has very excellent performance effects in the coloring of wood bases; combined with the current market development trend, the water-oil universal nano-color paste of the present application can not only break the constraints of the use of traditional color pastes, but also effectively save storage inventory for customers and provide convenience for on-site construction. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 2 This is a comparative test chart of water-oil universal nano color paste and ordinary water-based color paste with water-based color paste added with water-based color paste.

[0025] Figure 3 This is a comparative test chart of water-oil universal nano color paste and ordinary oil-based Grace color paste with oil-based Grace main agent added respectively. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

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

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

[0029] 10-Amino-1-decanol, CAS number is 23160-46-5.

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

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

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

[0033] Example 1

[0034] (1) Under nitrogen atmosphere, add 10 g of 8-amino-1-octanol and 600 mL of toluene to a reaction flask, stir evenly, add 16.5 g of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate and 3 g of tetrabutylammonium bromide, react at 70° C. for 5 h, filter, purify by column chromatography (ethyl acetate / petroleum ether=1:3), and dry to obtain sodium sulfonate-based long-chain diol. The preparation reaction formula is as follows:

[0035]

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

[0037] (3) Under nitrogen atmosphere, 45 g of isophorone diisocyanate, 90 g of vacuum-dehydrated polycaprolactone diol and 10 g of modified soybean oil polyol were added to a reaction flask equipped with a reflux condenser and a thermometer, the temperature was raised to 85°C for reaction for 3 h, 6 g of stannous octoate was added, the reaction was continued for 2 h, 7 g of 1,4-butanediol was added to react until -NCO reached the theoretical value (titrated by di-n-butylamine method), the temperature was lowered to 45°C, acetone was added to adjust the viscosity, 2 g of sodium sulfonate-based long-chain diol was added to react for 0.5 h, the pH value was adjusted to 8 with triethylamine, deionized water was added and stirred at high speed for 15 min, and the dealcoholized acetone was distilled under reduced pressure to obtain a water-oil modified polyurethane.

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

[0039] Example 2

[0040] (1) Under a nitrogen atmosphere, 10 g of 10-amino-1-n-decanol and 500 mL of toluene were added to a reaction flask, and after stirring, 14.5 g of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate and 2 g of benzyltriethylammonium chloride were added, and the mixture was reacted at 80° C. for 3 h, filtered, purified by column chromatography (ethyl acetate / petroleum ether=1:3), and dried to obtain a sodium sulfonate-based long-chain diol.

[0041] (2) Under nitrogen atmosphere, 100 g of epoxidized soybean oil and 50 g of sodium sulfonate-based long-chain diol were added to a reaction flask, and 10 drops of fluoroboric acid were added under vigorous stirring. The mixture was reacted at 120° C. for 1 h, 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 nitrogen atmosphere, 40 g of isophorone diisocyanate, 80 g of vacuum-dehydrated polycaprolactone diol and 230 g of modified soybean oil polyol were added to a reaction flask equipped with a reflux condenser and a thermometer, the temperature was raised to 90°C for reaction for 2 h, 4 g of stannous octoate was added, the reaction was continued for 1 h, 5 g of 1,4-butanediol was added to react until -NCO reached the theoretical value (titrated by di-n-butylamine method), the temperature was lowered to 35°C, acetone was added to adjust the viscosity, 6 g of sodium sulfonate-based long-chain diol was added to react for 1 h, the pH value was adjusted to 9 with triethylamine, deionized water was added and stirred at high speed for 10 min, and the dealcoholized acetone was distilled under reduced pressure to obtain a water-oil modified polyurethane.

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

[0044] Example 3

[0045] (1) Under a nitrogen atmosphere, 10 g of 12-amino-1-dodecanol and 650 mL of toluene were added to a reaction flask, and after stirring, 18 g of sodium 3-allyloxy-2-hydroxy-1-propanesulfonate and 5 g of tetrabutylammonium bromide were added, and the mixture was reacted at 60° C. for 8 h, filtered, purified by column chromatography (ethyl acetate / petroleum ether=1:3), and dried to obtain a sodium sulfonate-based long-chain diol.

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

[0047] (3) Under nitrogen atmosphere, 50 g of isophorone diisocyanate, 70 g of vacuum-dehydrated polycaprolactone diol and 30 g of modified soybean oil polyol were added to a reaction flask equipped with a reflux condenser and a thermometer, the temperature was raised to 75°C for reaction for 4 h, 8 g of stannous octoate was added, the reaction was continued for 3 h, 8 g of 1,4-butanediol was added to react until -NCO reached the theoretical value (titrated by di-n-butylamine method), the temperature was lowered to 35°C, acetone was added to adjust the viscosity, 10 g of sodium sulfonate-based long-chain diol was added to react for 1 h, the pH value was adjusted to 8 with triethylamine, deionized water was added and stirred at high speed for 20 min, and the dealcoholized acetone was distilled under reduced pressure to obtain a water-oil modified polyurethane.

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

[0049] Comparative Example 1

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

[0051] (2) Under a nitrogen atmosphere, 45 g of isophorone diisocyanate, 90 g of vacuum-dehydrated polycaprolactone diol and 10 g of soybean oil polyol were added to a reaction flask equipped with a reflux condenser and a thermometer. The temperature was raised to 85°C for reaction for 3 h. 6 g of stannous octoate was added and the reaction was continued for 2 h. 7 g of 1,4-butanediol was added and the reaction was continued until -NCO reached the theoretical value (titrated by di-n-butylamine method). The temperature was lowered to 45°C. acetone was added to adjust the viscosity. triethylamine was used to adjust the pH value to 8. Deionized water was added and stirred at high speed for 15 min. The acetone was dealcoholized and distilled under reduced pressure to obtain a modified polyurethane.

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

[0053] Particle size test: According to the method of GB / T 18854-2015, take 20g of the color paste in each grinding process and use an optical particle size analyzer to measure the particle size. 95 Particle size testing.

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

[0055] Table 1 Particle size and storage stability test

[0056]

[0057] It can be seen from the test results in the above table that the nano-color paste prepared in the example has a good dispersion effect, and after being stored alternately in hot and cold conditions for one month, the particle size does not change much, indicating that it has good storage stability; this is because the polyurethane in the example introduces long-chain alkyl groups, and their spatial arrangement in the molecular chain can form an interlaced arrangement structure, which can increase the interaction force between the long-chain alkyl groups and the polyurethane molecules, and is conducive to the dispersion and stability of the nano-color paste. The polyurethane structure usually contains a hydrophilic polyol chain and a hydrophobic isocyanate chain. The alternating arrangement of these two chain segments makes the polyurethane have both a certain hydrophilicity and a certain hydrophobicity, which provides the possibility for water-oil miscibility. By introducing a non-polar alkyl long chain with a certain hydrophobicity into the molecular structure of epoxy soybean oil, the hydrophobicity of the polyurethane can be enhanced, making the polyurethane more likely to interact with oily substances, thereby achieving water-oil miscibility. Sodium sulfonate is a strong acid and strong alkaline salt with good water solubility, making the polyurethane more likely to interact with water molecules, thereby achieving water-oil miscibility. Therefore, the water-oil modified polyurethane has both a certain hydrophobicity (provided by the alkyl long chain) and a certain hydrophilicity (provided by the sodium sulfonate). The balance of these two properties enables the polyurethane to play a stabilizing role in the water-oil mixture and has good storage stability. The polyurethane in Comparative Example 1 is not modified with water and oil, does not contain sodium sulfonate and alkyl long chains, and its particle size changes significantly, and the storage performance is poor.

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

[0059] (1) Solvent compatibility test: The nano-color paste prepared in Example 2 was added to deionized water, ethanol, butyl ester, ethyl ester and xylene in amounts of 5%, 50% and 90% respectively, and a solvent compatibility test was performed.

[0060] Table 2 Solvent compatibility test

[0061]

[0062] From Table 2 and Appendix Figure 1 It can be seen that the water-oil universal nano-color paste prepared in the present application has good solubility in water, alcohol, ester, and benzene solvents, and is not easy to separate.

[0063] (2) Base material compatibility test: The nano color paste prepared in Example 2 was added to PU paint, NC paint, UV paint, PE paint, water-based single-component paint and water-based two-component paint, with the addition amount being 10%, 20% and 30% respectively, and the base material compatibility test was carried out.

[0064] Table 3 Solvent compatibility test

[0065]

[0066] As can be seen from Table 3, the water-oil universal nano-color paste prepared in the present application is soluble in PU paint, NC paint, UV paint, PE paint, water-based one-component paint, and water-based two-component paint without precipitated particles.

[0067] Nano-color paste heat storage performance test: The nano-color paste prepared in Example 2 was divided into two portions, each with 500 g of color paste, and respectively loaded into 500 mL glass bottles, leaving about 10% space in the bottle. After sealing, one of the color samples was placed in a (50±2)°C constant temperature oven and marked as hot storage color paste; the other color sample was placed in an experimental environment at 25-35°C and marked as room temperature color paste; after 7 days, the hot storage color paste was taken out and placed in a specified environment at room temperature for 3 hours.

[0068] (1) Comparison of thermal storage discoloration: The prepared basic white paint (self-drying type) was mixed with the thermal storage color paste and the normal temperature color paste at a ratio of 5:95 to prepare 100g paint samples, which were marked as thermal storage paint and normal temperature paint respectively. A small amount of normal temperature paint and thermal storage paint were taken and placed on black and white cardboard. Two uniform opaque coatings with a width of not less than 25mm and a contact side length of not less than 40mm were prepared using a wet film preparation device (250um) on the black and white cardboard. The prepared paint samples were placed at room temperature to dry for 24 hours, and tested using a colorimeter according to the dilution method in 7.4 of GB / T 5211.1-1988.

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

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

[0071] (2) Paint thermal storage test

[0072] The nano color paste prepared in Example 2 was added to PU basic white paint (self-drying type) and water-based basic white paint (self-drying), respectively, and 1 kg of paint samples were prepared at a ratio of color paste: basic white paint of 5:95. The samples were divided into two portions and respectively loaded into 500 mL glass bottles, leaving about 10% space in the bottles. After sealing, one of the color samples was placed in a (50±2)°C constant temperature oven and marked as hot storage water-based paint and hot storage PU paint respectively; the other color sample was placed in an experimental environment of 25-35°C and marked as room temperature water-based paint and room temperature PU paint. After 7 days, the hot storage water-based paint and hot storage PU paint were taken out and placed in a specified environment at room temperature for 3 hours. Take a small amount of room temperature water-based paint (room temperature PU paint) and heat storage water-based paint (room temperature PU paint) respectively, 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 side length of not less than 40mm on black and white cardboard. Place the prepared paint samples at 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 Color paste thermal storage stability test

[0074] Color paste number PU base white paint Water-based 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 changes -3KU -5KU

[0075] It can be seen from the test results in Tables 4 and 5 that the water-oil universal nano-color paste prepared in the present application has ΔE≦0.5 during storage, has excellent anti-discoloration and stability, and meets the market demand for color paste storage and use.

[0076] The water-oil universal nano-color paste prepared in the present application is easy to prepare and has a wide range of applications. It is not only suitable for most oil-based paints and water-based paints on the market, but also has extremely high transparency and permeability in practical applications, and has excellent effects on coloring and wetting of wood. It can be used for rubbing and repairing color of high-transparent and semi-transparent paint decorations.

[0077] By the attached Figure 2 and attached Figure 3 It can be seen from the comparative test that the water-oil universal nano-color paste prepared in the present application has a stronger ability to show wood grain and permeability to wood.

[0078] In summary, the water-oil universal nano-color paste prepared in the present application has good solubility in common solvents such as water, ethanol, butyl ester, and xylene, and has excellent solubility and suspension with common PU paint, NC paint, UV paint, PE paint, and water-based one-component and water-based two-component paints; in addition, it also has very excellent performance effects in the coloring of wood bases; combined with the current market development trend, the water-oil universal nano-color paste of the present application can not only break the constraints of the use of traditional color pastes, but also effectively save storage inventory for customers and provide convenience for on-site construction.

[0079] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A method for preparing a water-oil universal nano-color paste, characterized in that: The preparation method is carried out according to the following steps: adding 30-40 parts of water-oil modified polyurethane, 3-5 parts of dispersant A and 2-6 parts of dispersant B by weight to a high-speed dispersing machine, dispersing them uniformly at 800-1000 r / min, then adding 6-10 parts of silicone surfactant, 5-8 parts of moisturizer and 0.3-0.6 parts of neutralizer, dispersing them at 500-600 r / min for 5-15 minutes, then adding 35-50 parts of deionized water and 20-30 parts of pigment toner, dispersing them at 1200-1500 r / min for 20-30 minutes, placing the uniformly mixed color paste in a nano-scale horizontal grinder for grinding, and finally adding 10-20 parts of ethanol to clean the color paste and the grinding equipment to obtain a water-oil universal nano color paste; The organic silicon surfactant is polydimethylsiloxane alcohol, the moisturizing agent is glycerin, and the neutralizing agent is isobutanolamine.

2. The method for preparing the water-oil universal nano-color paste according to claim 1, characterized in that: 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.

3. The method for preparing the water-oil universal nano-color paste according to claim 1, characterized in that: The pigment toner is any one of titanium white, carbon black, phthalocyanine blue, iron oxide yellow, anthraquinone red, isoindoline yellow or benzidine yellow.

4. The method for preparing the water-oil universal nano-color paste according to claim 1, characterized in that: 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 a 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 a catalyst, stir to react, filter after the reaction is completed, purify by column chromatography, and dry to obtain a 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 into a reaction flask, add 10-15 drops of fluoroboric acid under vigorous stirring, stir to react, and after the reaction is completed, cool to room temperature, extract with ethyl acetate and deionized water, and concentrate the organic phase to obtain a modified soybean oil polyol; Step (3), under a nitrogen atmosphere, add 40-50 parts by weight of isophorone diisocyanate, 70-90 parts of vacuum dehydrated polycaprolactone diol and 10-30 parts of modified soybean oil polyol to a reaction flask equipped with a reflux condenser and a thermometer, heat to 75-90° C. for reaction for 2-4 hours, add 4-8 parts of stannous octoate, continue to react for 1-3 hours, add 5-8 parts of 1,4-butanediol to react until -NCO reaches a theoretical value, cool to 35-50° C., add acetone to adjust the viscosity, add 2-10 parts of sodium sulfonate-based long-chain diol to react for 0.5-1 hour, adjust the pH value with triethylamine, add deionized water and stir at high speed for 10-20 minutes, and distill dealcoholized acetone under reduced pressure to obtain a water-oil modified polyurethane.

5. The method for preparing the water-oil universal nano-color paste according to claim 4, characterized in that: In the 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.

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

7. The method for preparing the water-oil universal nano-color paste according to claim 4, characterized in that: In the step (1), the reaction temperature is 60-80° C. and the reaction time is 3-8 hours.

8. The method for preparing the water-oil universal nano-color paste according to claim 4, characterized in that: In the step (2), the reaction temperature is 100-120° C. and the reaction time is 1-3 h.

9. The method for preparing the water-oil universal nano-color paste according to claim 4, characterized in that: In the step (3), the pH value is adjusted to 8-9.

10. A water-oil universal nano-color paste, characterized in that: Obtained by the preparation method according to any one of claims 1 to 9.

Images