High-saturation waterborne refinish paint compositions, methods of making and use thereof

Abstract

The application provides a high-saturation water-based repair paint composition, a preparation method and application thereof. The water-based repair paint composition comprises a color paste, a water-based polyurethane dispersion and water; wherein the color paste comprises a transparent orange pigment and a dispersant, the dispersant is a controlled radical polymerization acrylic block copolymer, the solid content of the controlled radical polymerization acrylic block copolymer is 40-70%, the amine value is 20-40 mg KOH / g, and the controlled radical polymerization acrylic block copolymer has a pigment anchoring group, and the pigment anchoring group is a polar group.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coatings, in particular to a high-saturation water-based touch-up paint composition, a preparation method of the water-based touch-up paint composition and an application of the water-based touch-up paint composition in product exterior coating. BACKGROUND

[0002] Automobile repair refers to the partial repair or recoating of the outer coating of a car due to accident damage or aging after years of use. Specifically, it is different from the general factory coating production line, and the to-be-coated vehicle model, color requirements are different, and the operation cannot be performed according to the specified process sequence, and the maximum baking temperature cannot exceed 60 degrees Celsius, otherwise the plastic accessories will be damaged.

[0003] Therefore, compared with the original factory paint of the car, the automobile repair paint has significant differences in product composition, application window, etc. For example, the repair paint product contains dozens or even hundreds of color masters, and the appropriate color master needs to be used to complete the color matching according to the actual color of the repaired car, and then the binder (to provide film performance) and the thinner (to provide application performance) are added, and manual stirring, filtering and spraying are performed. For the repair paint product, the color gamut space presented by the complete color master system must be able to cover all the colors of the original factory paint of the car, otherwise the color matching of the repair paint will not match the color of the car body, which will affect the repair and delivery.

[0004] At present, the automobile repair paint market in China is still dominated by solvent-based products. However, with the improvement of people's environmental awareness, the government has introduced a series of environmental protection laws, regulations and policies for the coating industry, and various regions have also introduced specific policies for automobile repair coating, which has effectively promoted the development of automobile repair paint from solvent-based to water-based. On the other hand, in recent years, the pursuit of car color on the automobile market is becoming more and more extreme, and some high-saturation metallic colors have appeared on the market, such as the orange color of Mercedes-Benz DESIGNO and the 27 orange color of Great Wall Automobile. Such colors are bright, pure and high in color saturation, which is the future development trend of car colors. In order to better meet the future environmental protection needs of water-based and the popular trend of car colors, it is particularly important and meaningful to have the technical ability to develop high-saturation water-based transparent color master.

[0005] At present, patents related to the preparation technology of high-saturation transparent color master mainly focus on traditional solvent-based coatings. For example, the U.S. invention patent TRANSPARENT PIGMENT DISPERSION PROCESS (Patent No. 4017448) discloses a preparation process of solvent-based transparent pigment paste, which involves transparent orange. In recent years, China has also applied for invention patents for solvent-based transparent orange automobile repair paint and its preparation method (Application Publication No. CN106675216A).

[0006] However, there is no patent publication related to the preparation technology of high-saturation transparent orange color masterbatch in the field of water-based repair paint so far.

[0007] Therefore, it is necessary to provide a new water-based repair paint composition to provide a water-based repair paint composition with pure color and high saturation. SUMMARY

[0008] The purpose of the present application is to provide a high-saturation water-based repair paint composition, its preparation method and application, so as to obtain a high-saturation water-based transparent repair paint composition, expand the color gamut space of the whole set of color masterbatch, and better meet the future market demand.

[0009] In order to achieve the above-mentioned purpose, according to an aspect of the present application, a high-saturation water-based repair paint composition is provided, comprising: color paste, water-based polyurethane dispersion and water; wherein the color paste comprises transparent orange pigment and dispersant, the dispersant is a controlled radical polymerization acrylic block copolymer, the solid content of which is 40-70%, the amine value is 20-40 mgKOH / g, and the controlled radical polymerization acrylic block copolymer has a pigment anchoring group, and the pigment anchoring group is a polar group; preferably, the polar group includes amine group, carboxyl group, phosphate or phosphate ester group, amide group, carbamate group.

[0010] The dispersant is, for example but not limited to, one or more of the following: DISPERBYK-2010 dispersant of BYK-Chemie, or Ultra PX 4575 or Ultra PX 4585 dispersant of BASF (China) Co., Ltd.

[0011] In some embodiments, the fineness of the water-based repair paint composition is less than or equal to 5 microns.

[0012] In some embodiments, the transparent orange pigment is at least one of pyrrolopyrrole pigment, pyrenone pigment and anthraquinone pigment.

[0013] The transparent orange pigment is, for example but not limited to, one or more of the following: Orange L 2985HD, Orange L 2990HD or Orange L 2995HD of BASF (China) Co., Ltd. Orange L 2985HD, Orange L 2990HD or Cosmoray Orange L 2950, or one or more of the products Hostaperm Orange GR, Hostatint Orange DPP 500, Hostaperm Scarlet GO transp., or PV Fast Orange H2GL from Clariant.

[0014] In the present application, by specifically selecting an orange pigment with a special chemical structure and matching a specific controllable free radical polymerization acrylic block copolymer as a dispersant, a high-saturation transparent color paste is obtained by using the specific pigment anchoring group on the molecular chain. In addition, in the present application, a resin-free system as described above is used to obtain a color paste with higher concentration, more suitable for grinding process in production process, and higher cost performance, thereby being able to prepare a waterborne repair paint composition product with higher concentration and finer fineness.

[0015] In some embodiments, the waterborne polyurethane dispersion is at least one of a polycarbonate-modified polyurethane dispersion, an aliphatic waterborne polyurethane dispersion, an aliphatic polycarbonate type waterborne polyurethane dispersion, and a waterborne dispersion of a polyether-based polyurethane, and the average particle size of the waterborne polyurethane dispersion is less than or equal to 60 nm.

[0016] The waterborne polyurethane dispersion is, for example but not limited to, one or more of the products selected from the products of Clariant with model numbers UH2110 or UH2648 / 1, the products of Zannan Resin (China) with model numbers TW6450 / 30WA, the products of Lubrizol with model numbers 898, or the products of DIC Corporation with model number HYDRAN WLS-210.

[0017] In the present application, by specifically selecting a waterborne polyurethane dispersion with small particle size and high molecular weight, the problem of shelf life of only 3-6 months of existing similar products is solved, and a waterborne repair paint composition with a product shelf life of 2-3 years is obtained. In addition, the waterborne polyurethane dispersion selected in the present application contains a high molecular weight polyurethane structure, which can impart excellent comprehensive performance to the paint film. At the same time, the waterborne polyurethane dispersion selected in the present application also plays an auxiliary wetting and dispersing role for the transparent orange pigment in the color paste, thereby further effectively prolonging the storage time of the waterborne repair paint composition. Furthermore, the waterborne polyurethane dispersion selected in the present application has small particle size and has the characteristics of strong permeability, which to some extent reduces the color difference between the wet film and the dry film formed by the waterborne repair paint composition, and further improves the color matching efficiency at the construction site.

[0018] In some embodiments, the water-based repair paint composition comprises, calculated based on the total mass of the water-based repair paint composition: 15-40% by mass of the color paste, and 15-40% by mass of the water-based polyurethane dispersion, with the balance being water.

[0019] In some embodiments, the color paste comprises, calculated based on the total mass of the color paste: 20-40% by mass of the transparent orange pigment, and 10-50% by mass of the dispersant, with the balance being water.

[0020] In some embodiments, the color paste further comprises a first auxiliary agent, which is at least one of a defoaming agent and a wetting dispersant.

[0021] The first auxiliary agent mainly functions as defoaming and auxiliary wetting, such as but not limited to: one or more of a defoaming agent of BYK-011 from BYK-Chemie, a defoaming agent of Foamex 830 from Elementis, a wetting dispersant of GA-210 from Elementis, or a wetting defoaming agent of ADOl from Elementis.

[0022] In some embodiments, the mass percentage of the first auxiliary agent is less than or equal to 10% based on the total mass of the color paste.

[0023] In some embodiments, the water-based repair paint composition further comprises a second auxiliary agent, which is at least one of a viscosity regulator, a wetting agent, a leveling agent, and a pH regulator.

[0024] The second auxiliary agent mainly functions as anti-settling, wetting, leveling, pH adjustment, etc., such as but not limited to: one or more of AQUATIX 8421 wax from BYK-Chemie or AS1130 from BASF (China) Co., Ltd. to regulate the viscosity of the water-based repair paint composition and improve the anti-settling effect of the color masterbatch storage; one or more of BYK-345 or BYK-333 from BYK-Chemie, Twin 4100 or 440 from Elementis to improve the comprehensive effects of leveling, wetting, defoaming, etc. in construction.

[0025] In some embodiments, the pH regulator is N,N-dimethylethylamine (DMEA).

[0026] In some embodiments, the mass percentage of the second auxiliary agent is less than or equal to 10% based on the total mass of the water-based repair paint composition.

[0027] ​​In some embodiments, the aqueous refinish coating composition further comprises an organic solvent, and the organic solvent is a hydrocarbon solvent.

[0028] In some embodiments, the organic solvent is at least one of isomeric alkane solvent, isooctanol, ethylene glycol hexyl ether, ethylene glycol isooctyl ether, isopropyl alcohol, propylene glycol methyl ether, dipropylene glycol methyl ether, and ethylene glycol butyl ether.

[0029] In the present application, the above-mentioned organic solvent is specifically selected to include two types of hydrophobic and hydrophilic: the hydrophobic solvent is one or more of SHELLSOL TK, isooctanol, ethylene glycol hexyl ether, ethylene glycol isooctyl ether; the hydrophilic solvent is one or more of isopropyl alcohol, propylene glycol methyl ether, dipropylene glycol methyl ether, and ethylene glycol butyl ether. The above-mentioned organic solvent has an important role in the adjustment of defoaming, rheology, and volatilization rate of the aqueous refinish coating composition.

[0030] In some embodiments, the mass percentage of the organic solvent is less than or equal to 10% calculated based on the total mass of the aqueous refinish coating composition.

[0031] According to another aspect of the present application, a preparation method of the above-mentioned aqueous refinish coating composition is provided, comprising: a step of providing a color paste and a step of obtaining the aqueous refinish coating composition; wherein the preparation method comprises: a step of providing a color paste and a step of obtaining the aqueous refinish coating composition; wherein,

[0032] In the step of providing the color paste, the color paste comprises a transparent orange pigment and a dispersant, the dispersant is a controlled radical polymerization acrylic block copolymer, the solid content of the controlled radical polymerization acrylic block copolymer is 40-70%, the amine value is 20-40 mg KOH / g, and the controlled radical polymerization acrylic block copolymer has a pigment anchoring group, and the pigment anchoring group is a polar group; preferably, the polar group includes an amine group, a carboxyl group, a phosphoric acid or phosphate group, an amide group, a carbamate group;

[0033] The step of providing the color paste comprises a dispersion step and a grinding step; in the grinding step, the color paste is ground with a grinding medium, so that the fineness of the aqueous refinish coating composition is less than or equal to 5 microns; and,

[0034] In the step of obtaining the aqueous refinish coating composition, the ground color paste is dispersed in an aqueous polyurethane dispersion to obtain the aqueous refinish coating composition.

[0035] In some embodiments, the grinding step is performed in a grinding machine, and the grinding conditions satisfy at least one of the following conditions: i) the particle size of the grinding medium of the grinding machine is 0.6-1.2 mm; ii) the filling rate of the grinding medium of the grinding machine is 75-88%; iii) the flow rate of the color paste is 150-250 kg / h; and iv) the grinding medium is zirconium oxide beads or yttrium-modified zirconium beads.

[0036] In some embodiments, the step of providing the color paste and the step of obtaining the water-based repair paint composition are performed under alkaline conditions.

[0037] In some embodiments, a method for preparing the above-mentioned water-based repair paint composition is provided, comprising:

[0038] The step of providing the color paste comprises: performing first-step dispersion on water, a dispersant, and a first auxiliary agent in the components of the color paste, and then performing second-step dispersion after adding a transparent orange pigment; then, performing a grinding step on the color paste in a grinding machine; wherein the grinding conditions satisfy at least one of the following conditions: i) the particle size of the grinding medium of the grinding machine is 0.6-1.2 mm; ii) the filling rate of the grinding medium of the grinding machine is 75-88%; iii) the flow rate of the color paste is 150-250 kg / h; and iv) the grinding medium is zirconium oxide beads or yttrium-modified zirconium beads; and,

[0039] The step of obtaining the water-based repair paint composition comprises: performing first-step dispersion on water, a water-based polyurethane dispersion, a second auxiliary agent, and an organic solvent in the components of the water-based repair paint composition, and then performing second-step dispersion after adding the ground color paste, to finally obtain the water-based repair paint composition.

[0040] In the present application, by specifically selecting the components of the color paste, combining a high-energy grinding process, and introducing a special water-based polyurethane dispersion, a water-based repair paint composition with high saturation and high stability is obtained. The water-based polyurethane dispersion provided in the present application can meet the environmental protection demand of water-based in the coating industry and the popular trend of automobile colors, expand the color gamut space of the complete set of color masterbatch, and better meet the future market demand. DETAILED DESCRIPTION

[0041] The technical solutions of the present application are described below in combination with some specific embodiments. Those skilled in the art should understand that the specific descriptions below are illustrative and not limiting, and should not limit the protection scope of the present application.

[0042] Unless otherwise specified, the various raw materials used in the present application are commercially available or are prepared according to conventional methods in the art. Unless otherwise specified, all of the professional and scientific terms used in the present application have the same meanings as those familiar to those skilled in the art. Any method or material similar to those described can be applied in the methods of the present application.

[0043] According to one embodiment of the present application, a high-saturation water-based touch-up paint composition is provided, the water-based touch-up paint composition having a fineness of less than or equal to 5 microns, and, based on the total mass of the water-based touch-up paint composition, the water-based touch-up paint composition comprising:

[0044] a color paste having a mass percentage of 15 to 40%;

[0045] a water-based polyurethane dispersion having a mass percentage of 15 to 40%;

[0046] a second auxiliary agent having a mass percentage of less than or equal to 10%;

[0047] an organic solvent having a mass percentage of less than or equal to 10%; and,

[0048] a balance of water; wherein,

[0049] the color paste comprises, based on the total mass of the color paste:

[0050] a transparent orange pigment having a mass percentage of 20 to 40%;

[0051] a dispersant having a mass percentage of 10 to 50%;

[0052] a first auxiliary agent having a mass percentage of less than or equal to 10%; and,

[0053] a balance of water.

[0054] the dispersant is a controlled radical polymerized acrylic block copolymer having a solid content of 40 to 70% and an amine value of 20 to 40 mg KOH / g, and the controlled radical polymerized acrylic block copolymer has a pigment anchoring group, the pigment anchoring group being a polar group; preferably, the polar group includes an amine group, a carboxyl group, a phosphoric acid or phosphate ester group, an amide group, a carbamate group.

[0055] the dispersant is, for example, but not limited to, one or more of the dispersants of the type DISPERBYK-2010 from BYK-Chemie, or the dispersants of the type Ultra PX 4575 or Ultra PX 4585 from BASF (China) Co., Ltd.

[0056] The transparent orange pigment is at least one of a diketopyrrolopyrrole pigment, a pyranthrone pigment, and an anthraquinone pigment. The transparent orange pigment is, for example, but not limited to, one or more of the products of BASF (China) Co., Ltd. with model numbers Orange L2985HD, Orange L 2990HD, or Cosmoray Orange L 2950, or the products of Clariant with model numbers Hostaperm Orange GR, Hostatint Orange DPP 500, Hostaperm Scarlet GO transp., or PV Fast Orange H2GL.

[0057] The aqueous polyurethane dispersion is at least one of a polycarbonate-modified polyurethane dispersion, an aliphatic aqueous polyurethane dispersion, an aliphatic polycarbonate-type aqueous polyurethane dispersion, and an aqueous dispersion of a polyether-based polyurethane, and the average particle size of the aqueous polyurethane dispersion is less than or equal to 60 nm. The aqueous polyurethane dispersion is, for example, but not limited to, one or more of the products of Covestro with model numbers UH2110, or UH2648 / 1, of Zannan Resin (China) Co., Ltd., with model numbers TW 6450 / 30WA, of Dow Corning, with model numbers 898, or the product of DIC Corporation with model number HYDRAN WLS-210.

[0058] The first auxiliary agent mainly functions to defoam and assist in wetting. For example, but not limited to, one or more of the defoaming agents of BYK-Chemie with model number BYK-011, the defoaming agents of Wanhua Industrial Group with model numbers Foamex 830, GA-210, the wetting dispersants of AD01.

[0059] The second auxiliary agent is at least one of a viscosity regulator, a wetting agent, a leveling agent, and a pH regulator. The second auxiliary agent mainly functions to prevent settling, wetting, leveling, pH adjustment, etc. For example, but not limited to, one or more of the wetting agents of BYK-Chemie with model number AQUATIX 8421 wax or the wetting agents of BASF (China) Co., Ltd. with model numbers AS1130 to regulate the viscosity of the aqueous repair paint composition and improve the anti-settling effect of the color masterbatch storage; the leveling agents of BYK-Chemie with model numbers BYK-345 or BYK-333, or the leveling agents of Wanhua Industrial Group with model numbers Twin 4100 or 440, one or several of which are used to improve the overall effect of leveling, wetting, defoaming, etc. in terms of construction. The pH regulator is N,N-dimethylethylamine (DMEA).

[0060] The organic solvent is at least one of isomeric alkane solvents, isooctanol, ethylene glycol hexyl ether, ethylene glycol isooctyl ether, isopropyl alcohol, propylene glycol methyl ether, dipropylene glycol methyl ether, and ethylene glycol butyl ether.

[0061] The preparation method of the water-based repair paint composition comprises:

[0062] S1: a step of providing a color paste

[0063] According to the above formula of the color paste, the water, the dispersant, and the first auxiliary agent in all components of the color paste are dispersed in the first step, and then the transparent orange pigment is added for the second step of dispersion. Then, the color paste is ground in a grinding machine. The grinding conditions meet at least one of the following conditions: i) the particle size of the grinding medium of the grinding machine is 0.6-1.2 mm; ii) the filling rate of the grinding medium of the grinding machine is 75-88%; iii) the flow rate of the color paste is 150-250 kg / h; and iv) the grinding medium is zirconium oxide beads or yttrium modified zirconium beads.

[0064] S2: a step of obtaining the water-based repair paint composition

[0065] According to the above formula of the water-based repair paint composition, the water, the water-based polyurethane dispersion, the second auxiliary agent, and the organic solvent in all components of the water-based repair paint composition are dispersed in the first step, and then the ground color paste is added for the second step of dispersion to finally obtain the water-based repair paint composition.

[0066] Example 1 Water-based repair paint composition 1

[0067] In this embodiment, a water-based repair paint composition 1 is provided, which comprises: 30 kg of color paste, 15 kg of UH2648 / 1 resin, and 10 kg of 898 resin, 33 kg of neutral to slightly alkaline deionized water (pH = 7-8), 5 kg of propylene glycol methyl ether, 2 kg of isopropyl alcohol, 1 kg of SHELLSOL TK, and 0.1 kg of BYK-333, and 1 kg of Twin 4100; at the same time, 2.5 kg of AS1130 is used for viscosity adjustment, and 0.4 kg of DMEA is used for pH adjustment.

[0068] The color paste comprises: 10 kg of Cosmoray Orange L 2950 pigment, 18 kg of neutral to slightly alkaline deionized water (pH = 7-8), 10 kg of Ultra PX 4585 dispersant, 0.4 kg of BYK-011 antifoam agent, and 1.6 kg of GA-210 wetting dispersant.

[0069] The preparation steps of the water-based repair paint composition 1 are as follows:

[0070] (1) Preparation of the color paste

[0071] (1.a) 18 kg of neutral to slightly alkaline deionized water (pH = 7-8), 10 kg of Ultra PX 4585 dispersant, 0.4 kg of BYK-011 antifoam agent, and 1.6 kg of GA-210 wetting dispersant were sequentially added into a 60 L cylinder, and stirred in a high-speed disperser at a speed of 1500 r / min for 20 min;

[0072] (1.b) Then the stirring and dispersing speed was adjusted to 750 r / min, 10 kg of Cosmoray Orange L 2950 pigment was slowly added, and high-speed dispersion was carried out at 2500 r / min for 50 min;

[0073] (1.c) The premixed paste after high-speed dispersion was subjected to circulation grinding with a NETZSCH NEOS horizontal pin sand mill, the type of sanding beads was zirconia beads with a particle size of 0.6-0.8 mm, the filling rate of sanding beads was 82%, and the flow rate of the paste was 200 kg / h; the measured grinding residence time window was 10-20 min;

[0074] (2) Obtain the water-based repair paint composition

[0075] (2.a) 33 kg of neutral to slightly alkaline deionized water (pH = 7-8), 15 kg of UH2648 / 1 resin, and 10 kg of 898 resin were sequentially added into a 150 L cylinder, and stirred in a low-speed disperser at a speed of 150 r / min for 10 min;

[0076] (2.b) Then 8.1 kg of mixed materials (5 kg of propylene glycol methyl ether, 2 kg of isopropyl alcohol, 1 kg of SHELLSOL TK, and 0.1 kg of BYK-333 auxiliary agent were uniformly mixed in another 15 L small cylinder) were slowly added, and 1 kg of Twin 4100, continue to disperse at low speed for 10 min under the condition of 200 r / min;

[0077] (2.c) Next, add 30 kg of the colorant obtained in step (1) and disperse at 300 r / min for 30 min, and confirm that the fineness of the water-based repair paint composition 1 is ≤5 μm.

[0078] In this embodiment, during the grinding process of step (1), the particle size data of the colorant at different grinding residence times were measured using dynamic light scattering DLS, and the particle size data shown in Table 1 were obtained.

[0079] Table 1. Particle size data of the colorant at different grinding residence times

[0080] Grinding residence time D10 / nm D50 / nm D90 / nm 10 min 119 208 286 20 min 87 176 277 30 min 89 182 296 40 min 87 166 301

[0081] Further, the colorimeter test was used to test the color of the paint film formed by the water-based repair paint composition 1 provided in this embodiment after 150 μm scraping, and the data shown in Table 2 were obtained.

[0082] Table 2. Color data of the water-based repair paint composition 1 under scraping conditions

[0083]

[0084] The color difference data between the white and black backgrounds included in the color data of Table 2 are sufficient to prove that the water-based repair paint composition 1 of this embodiment has high saturation and high transparency characteristics.

[0085] In addition, the thermal storage stability of the water-based repair paint composition 1 of this embodiment was further tested, and the viscosity, fineness, pH and color change of the same water-based repair paint composition 1 after different thermal storage times were tested, and the data shown in Table 3 were obtained.

[0086] Table 3. Viscosity, fineness, pH and color change data of the water-based repair paint composition 1 at different thermal storage times

[0087]

[0088] As can be seen from the data in Table 3, the water-based repair paint composition 1 of this embodiment has good thermal storage stability, which meets the special requirements of the repair paint industry for long-term storage. Moreover, experiments have shown that after 40°C*6 months, the performance and application performance of the paint film formed by the water-based repair paint composition 1 of this embodiment still meet the requirements of the repair paint industry.

[0089] Example 2 Water-based repair paint composition 2

[0090] In this embodiment, an aqueous repair paint composition 2 is provided, which comprises: 30 kg of a color paste, 15 kg of UH2648 / 1 resin, and 10 kg of 898 resin, 33 kg of neutral to slightly alkaline deionized water (pH = 7-8), 5 kg of propylene glycol methyl ether, 2 kg of isopropyl alcohol, 1 kg of SHELLSOL TK, and 0.1 kg of BYK-333, and 1 kg of Twin 4100; at the same time, 2.5 kg of AS1130 is used for viscosity adjustment, and 0.4 kg of DMEA is used for pH adjustment.

[0091] The color paste comprises: 10 kg of Cosmoray Orange L 2950 pigment, 18 kg of neutral to slightly alkaline deionized water (pH = 7-8), 10 kg of Ultra PX 4585 dispersant, 0.4 kg of BYK-011 defoaming agent, and 1.6 kg of GA-210 wet dispersant.

[0092] The preparation steps of the aqueous repair paint composition 2 are as follows:

[0093] (1) Preparation of the color paste

[0094] (1.a) 18 kg of neutral to slightly alkaline deionized water (pH = 7-8), 10 kg of Ultra PX 4585 dispersant, 0.4 kg of BYK-011 defoaming agent, and 1.6 kg of GA-210 wet dispersant are sequentially added into a 60 L cylinder, and stirred in a high-speed disperser at a speed of 1500 r / min for 20 min;

[0095] (1.b) Then the stirring and dispersing speed is adjusted to 750 r / min, 10 kg of Cosmoray Orange L 2950 pigment is slowly added, and high-speed dispersion is carried out at 2500 r / min for 50 min;

[0096] (1.c) The premixed slurry after high-speed dispersion is subjected to circulation grinding with a NETZSCH NEOS horizontal pin sand mill, the sand mill bead type is zirconia bead, the particle size is 0.8-1.0 mm, the sand mill bead filling rate is 85%, and the slurry flow rate is 200 kg / h; the measured grinding residence time window is 20-40 min;

[0097] (2) Obtain the aqueous repair paint composition

[0098] (2.a) Into a 150 L beaker, sequentially add 33 kg of neutral to slightly alkaline deionized water (pH = 7-8), 15 kg of UH2648 / 1 resin, 10 kg of 898 resin, and stir in a low-speed disperser at 150 r / min for 10 min;

[0099] (2.b) Then slowly add 8.1 kg of a mixture (5 kg of propylene glycol methyl ether, 2 kg of isopropyl alcohol, 1 kg of SHELLSOL TK, and 0.1 kg of BYK-333 additive are uniformly mixed in another 15 L beaker) and 1 kg of Twin 4100, continue to disperse at 200 r / min for 10 min;

[0100] (2.c) Next, add 30 kg of the colorant obtained in step (1) and disperse at 300 r / min for 30 min, and confirm that the fineness of the water-based repair paint composition 2 is ≤ 5 μm.

[0101] In this example, during the grinding process in step (1), the particle size data of the colorant at different grinding residence times are measured using dynamic light scattering (DLS), and the particle size data shown in Table 4 are obtained.

[0102] Table 4. Particle size data of the colorant at different grinding residence times

[0103] Grinding residence time D10 / nm D50 / nm D90 / nm 5 min 148 225 327 10 min 128 231 367 20 min 102 191 316 25 min 92 182 302 30 min 88 172 307 40 min 88 179 294

[0104] Example 3 Water-based repair paint composition 3

[0105] In this example, a water-based repair paint composition 3 is provided, which comprises: 30 kg of colorant, 25 kg of Covestro’s UH2110 resin, 33 kg of neutral to slightly alkaline deionized water (pH = 7-8), 5 kg of propylene glycol methyl ether, 2 kg of isopropyl alcohol, 1 kg of SHELLSOL TK, and 0.1 kg of BYK-333, and 1 kg of Twin 4100; at the same time, 2.5 kg of AS1130 is used for viscosity adjustment, and 0.4 kg of DMEA is used for pH adjustment.

[0106] The colorant comprises: 10 kg of Cosmoray Orange L 2950 pigment, 18 kg of neutral to slightly alkaline deionized water (pH = 7-8), 10 kg of Ultra PX 4585 dispersant, 0.4 kg of BYK-011 antifoam agent, and 1.6 kg of GA-210 wetting dispersant.

[0107] The preparation steps of the waterborne repair paint composition 3 are as follows:

[0108] (1) Preparation of the color paste

[0109] (1.a) 18 kg of neutral to slightly alkaline deionized water (pH = 7-8), 10 kg of Ultra PX 4585 dispersant, 0.4 kg of BYK-011 antifoam agent, and 1.6 kg of GA-210 wetting dispersant were sequentially added into a 60 L cylinder, and stirred in a high-speed disperser at a speed of 1500 r / min for 20 min;

[0110] (1.b) Then the stirring and dispersing speed was adjusted to 750 r / min, and 10 kg of Cosmoray Orange L 2950 pigment was slowly added, and high-speed dispersion was carried out at 2500 r / min for 50 min;

[0111] (1.c) The premixed paste after high-speed dispersion was subjected to circulation grinding with a NETZSCH NEOS horizontal pin sand mill, the type of sanding beads was zirconia beads with a particle size of 0.6-0.8 mm, the filling rate of sanding beads was 82%, and the flow rate of the paste was 200 kg / h; the measured grinding residence time window was 10-20 min;

[0112] (2) Obtain the waterborne repair paint composition

[0113] (2.a) 33 kg of neutral to slightly alkaline deionized water (pH = 7-8), 25 kg of UH2110 resin of Covestro were sequentially added into a 150 L cylinder, and stirred in a low-speed disperser at a speed of 150 r / min for 10 min;

[0114] (2.b) Then 8.1 kg of mixed materials (5 kg of propylene glycol methyl ether, 2 kg of isopropyl alcohol, 1 kg of SHELLSOL TK, and 0.1 kg of BYK-333 auxiliary agent were uniformly mixed in another 15 L small cylinder) were slowly added, and 1 kg of Twin 4100 was further added, and low-speed dispersion was continued at 200 r / min for 10 min;

[0115] (2.c) Next, 30 kg of the color paste obtained in step (1) was added and dispersed at 300 r / min for 30 min, and the fineness of the water-based repair paint composition 3 was confirmed to be ≤5 μm.

[0116] Experiments show that the water-based repair paint composition 3 of the present embodiment has excellent paint film performance and thermal storage stability, fully meeting the industry requirements for repair paint. Since the UH2110 resin used in the present embodiment has a better permeability than the UH2110 resin used in the water-based repair paint composition 1 of Example 1 or the UH2648 / 1 resin used in the water-based repair paint composition 2 of Example 2, the dry-wet film color difference of the water-based repair paint composition 3 of the present embodiment is smaller than that of the water-based repair paint composition 1 of Example 1. UH2110 resin of the present embodiment has a better permeability than the UH2110 resin used in the water-based repair paint composition 1 of Example 1 or the UH2648 / 1 resin used in the water-based repair paint composition 2 of Example 2, the dry-wet film color difference of the water-based repair paint composition 3 of the present embodiment is smaller than that of the water-based repair paint composition 1 of Example 1. UH2648 / 1, therefore, the dry-wet film color difference of the water-based repair paint composition 3 of the present embodiment is smaller than that of the water-based repair paint composition 1 of Example 1.

[0117] Comparative Example 1

[0118] In the present comparative example, a comparative water-based repair paint composition 1 is provided, in which the orange pigment of the water-based repair paint composition 1 of Example 1 is replaced with an equal amount of an orange pigment of the type Novoperm Orange HL 70 from Clariant Chemicals. Cosmoray Orange L 2950, and the other components are exactly the same as those of the water-based repair paint composition 1 of Example 1.

[0119] In addition, the preparation method of the comparative water-based repair paint composition 1 of the present comparative example is exactly the same as that of the water-based repair paint composition 1 of Example 1.

[0120] In the same test manner as that of Example 1, the color of the paint film formed by the comparative water-based repair paint composition 1 provided in the present comparative example was tested by a color difference meter after 150 μm doctor blade, and the data shown in Table 5 were obtained.

[0121] Table 5. Color data of the comparative water-based repair paint composition 1 under the doctor blade condition

[0122]

[0123] As can be seen from the comparison of the data in Table 5 and Table 2, the color difference data (3.04) of the comparative water-based repair paint composition 1 of the present comparative example between white and black backgrounds after the doctor blade is much smaller than the color difference data (64.83) of the water-based repair paint composition 1 of Example 1, indicating that the transparency of the comparative water-based repair paint composition 1 of the present comparative example is much poorer than that of the water-based repair paint composition 1 of Example 1.

[0124] Comparative Example 2

[0125] In the present comparative example, a comparative water-based repair paint composition 2 is provided, in which the UH2648 / 1 resin used in the water-based repair paint composition 2 of Example 2 is replaced with an equal amount of a resin of the type Dispersant equivalent replacement of Ultra PA4550 in the water-based repair paint composition 1 of Example 1 Ultra PX 4585 dispersant, and the rest of the components are exactly the same as the components and contents of the water-based repair paint composition 1 described in Example 1.

[0126] Also, the preparation method of the comparative water-based repair paint composition 1 of the present comparative example is basically the same as the water-based repair paint composition 1 described in Example 1, except that the step of adding

[0127] Within the interval of 10-40min of grinding residence time, the measured D50 particle size data of the color paste of the comparative water-based repair paint composition 2 of the present comparative example is always greater than 300nm, and cannot reach the D50 particle size level (~200nm) in Example 1.

[0128] Comparative Example 3

[0129] In the present comparative example, a comparative water-based repair paint composition 3 is provided, the components of which are exactly the same as those of the water-based repair paint composition 1 of Example 1, and the preparation method is basically the same as that of Example 1, except that the NETZSCH NEOS described in Example 1 is replaced by a horizontal sand mill NETZSCH LABSTAR without a pin to perform cyclic grinding, and the other preparation steps are exactly the same as those of Example 1.

[0130] Within the interval of 10-40min of grinding residence time, the measured D50 particle size data of the color paste of the comparative water-based repair paint composition 3 of the present comparative example is always greater than 250nm, and cannot reach the D50 particle size level (~200nm) in Example 1.

[0131] Comparative Example 4

[0132] In the present comparative example, a comparative water-based repair paint composition 4 is provided, which does not contain 15kg of UH2648 / 1 resin and 10kg of 898 resin, and the rest of the components are exactly the same as the components and contents of the water-based repair paint composition 1 of Example 1.

[0133] Also, the preparation method of the comparative water-based repair paint composition 1 of the present comparative example is basically the same as the water-based repair paint composition 1 described in Example 1, except that the step of adding UH2648 / 1 resin and 898 resin.

[0134] The thermal storage stability of the comparative water-based repair paint composition 4 of the present comparative example was tested by the same test method as in Example 1, and the data shown in Table 6 were obtained.

[0135] Table 6. Viscosity, fineness, pH and color change data of comparative waterborne refinish composition 4 at different heat storage time

[0136] Comparative Example 4 Fineness / pm B6 viscosity / mPas Initial state 5 pm 1826 40°C * 2 months 15 pm 7700 40°C * 4 months 50 pm 33900

[0137] As can be seen from the comparison of the data in Table 6 and Table 3, the heat storage stability of the comparative waterborne refinish composition 4 of the present comparative example, which lacks the waterborne polyurethane dispersion, is significantly decreased compared to the waterborne refinish composition 1 of Example 1, and cannot meet the special requirements of the refinish industry for long-term storage.

[0138] Comparative Example 5

[0139] In the present comparative example, a comparative waterborne refinish composition 5 is provided, which is prepared by replacing 15 kg of PU 1035W resin in the waterborne refinish composition 1 of Example 1 with 15 kg of UH2648 / 1 resin and 10 kg of 898 resin, and the other components are the same as those in the waterborne refinish composition 1 of Example 1.

[0140] In addition, the preparation method of the comparative waterborne refinish composition 1 of the present comparative example is the same as that of the waterborne refinish composition 1 described in Example 1.

[0141] Experiments show that, The molecular weight of PU 1035W resin is small, and it contains more hydroxyl hydrophilic functional groups. In the case that the refinish system cannot be further crosslinked, it will have a certain negative impact on the performance of the paint film. The use of The comparative waterborne refinish composition 5 of PU 1035W resin can pass the heat storage stability test at 40°C for 6 months, but the paint film has poor water resistance, and the surface is severely blistered after 10 days of 40°C immersion, and the water resistance of the paint film cannot meet the requirements of the refinish industry.

[0142] The present application has been described by the above-mentioned related examples, however, the above-mentioned examples are only examples for implementing the present application. It must be pointed out that the disclosed examples do not limit the scope of the present application. On the contrary, modifications and equivalents included in the spirit and scope of the claims are included in the scope of the present application.

Claims

1. A high-saturation water-based refinish paint composition characterized in that, The water-based repair paint composition comprises: a color paste, a water-based polyurethane dispersion, and water; wherein The color paste comprises a transparent orange pigment and a dispersant, The dispersant is a controlled radical polymerization acrylic block copolymer having a solid content of 40-70% and an amine value of 20-40 mg KOH / g, and the controlled radical polymerization acrylic block copolymer has a pigment anchoring group, and the pigment anchoring group is a polar group, The transparent orange pigment is at least one of a pyrrolopyrrole pigment, a pyrenone pigment, and an anthraquinone pigment; The water-based polyurethane dispersion is at least one of a polycarbonate-modified polyurethane dispersion, an aliphatic water-based polyurethane dispersion, and a water-based dispersion of a polyether-based polyurethane, and the average particle size of the water-based polyurethane dispersion is less than or equal to 60 nm.

2. The aqueous refinish paint composition according to claim 1, characterized in that, The polar group includes an amine group, a carboxyl group, a phosphate or phosphate ester group, an amide group, and a carbamate group.

3. The aqueous refinish paint composition according to claim 1, wherein The water-based repair paint composition has a fineness of less than or equal to 5 microns.

4. The aqueous refinish paint composition according to any one of claims 1 to 3, characterized in that The water-based polyurethane dispersion is an aliphatic polycarbonate water-based polyurethane dispersion.

5. The aqueous refinish paint composition according to claim 4, characterized in that The water-based repair paint composition comprises, based on the total mass of the water-based repair paint composition, 15-40% by mass of the color paste, and 15-40% by mass of the water-based polyurethane dispersion, with the balance being water.

6. The aqueous refinish paint composition according to claim 5, characterized in that The color paste comprises, based on the total mass of the color paste, 20-40% by mass of the transparent orange pigment, and 10-50% by mass of the dispersant, with the balance being water.

7. The aqueous refinish paint composition according to claim 5, wherein The color paste further comprises a first auxiliary agent, and the first auxiliary agent is at least one of a defoaming agent and a wet dispersant.

8. The aqueous refinish paint composition according to claim 7, characterized in that The mass percentage of the first auxiliary agent is less than or equal to 10% based on the total mass of the color paste.

9. The aqueous refinish paint composition according to claim 5, wherein The water-based repair paint composition further comprises a second auxiliary agent, and the second auxiliary agent is at least one of a viscosity modifier, a wetting agent, a leveling agent, and a pH adjuster.

10. The aqueous refinish paint composition according to claim 9, characterized in that The mass percentage of the second auxiliary agent is less than or equal to 10% based on the total mass of the water-based repair paint composition.

11. The aqueous refinish paint composition according to claim 9, characterized in that The water-based repair paint composition further comprises an organic solvent, and the organic solvent is a hydrocarbon solvent.

12. The aqueous refinish paint composition according to claim 11, characterized in that The organic solvent is at least one of an isomeric alkane solvent, isooctanol, ethylene glycol hexyl ether, ethylene glycol isooctyl ether, isopropyl alcohol, propylene glycol methyl ether, dipropylene glycol methyl ether, and ethylene glycol butyl ether.

13. The aqueous refinish paint composition according to claim 12, characterized in that The mass percentage of the organic solvent is less than or equal to 10% based on the total mass of the water-based repair paint composition.

14. A process for the preparation of an aqueous repair paint composition according to any one of claims 1 to 13, characterized in that The preparation method comprises the steps of providing a color paste and obtaining the water-based repair paint composition; wherein The step of providing the color paste comprises a dispersion step and a grinding step; in the grinding step, the color paste is ground with a grinding medium to obtain a water-based repair paint composition having a fineness of less than or equal to 5 microns; and In the step of obtaining the water-based repair paint composition, the ground color paste is dispersed in a water-based polyurethane dispersion to obtain the water-based repair paint composition.

15. The method of preparing an aqueous repair paint composition according to claim 14, characterized in that The grinding step is performed in a grinding machine, and the grinding conditions satisfy at least one of the following conditions: i) the particle size of the grinding media of the mill is from 0.6 to 1.2 mm; ii) the filling rate of the grinding media of the mill is from 75 to 88%; iii) the flow rate of the color paste is from 150 to 250 kg / h; and iv) the grinding media are zirconium oxide beads or zirconium beads modified with silica.

16. The method of preparing an aqueous repair paint composition according to claim 14, characterized in that, The step of providing the color paste and the step of obtaining the aqueous refinish paint composition are carried out under alkaline conditions.

17. Use of the aqueous refinish paint composition according to any one of claims 1 to 13 in the external or internal painting of a product.

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