Acrylic acid non-aqueous dispersion composition as well as preparation method and application thereof

Abstract

The invention provides an acrylic acid non-aqueous dispersion composition as well as a preparation method and application thereof, and belongs to the technical field of polymer compositions. The acrylic acid non-aqueous dispersion composition is prepared from the following components in parts by weight: 50 to 70 parts of acrylic acid non-aqueous dispersion, 20 to 30 parts of amino resin, 5 to 10 parts of nano SiO2 modified acrylic acid non-aqueous dispersion, 2 to 4 parts of a solvent, 0.1 to 0.5 part of a de-foaming agent, 0.5 to 1 part of a closed drier, 1 to 2 parts of a flatting agent and 1 to 2 parts of an anti-aging agent, the acrylic acid non-aqueous dispersion is a dispersion liquid with the solid content of 70-80%, and active components in the dispersion liquid comprise the following components in parts by weight: 5-10 parts of a dispersion stabilizer and 80-90 parts of an acrylate random copolymer with a structure as shown in a formula I; the dispersion stabilizer is allyl polyhydroxyalkanoate; the acrylic acid non-aqueous dispersion has a viscosity of 1000 to 3000 cps at a temperature of 25 DEG C. Formula I.

Description

Technical Field

[0001] This invention relates to the field of polymer composition technology, and more specifically to an acrylic non-aqueous dispersion composition, its preparation method, and its application. Background Technology

[0002] The main technical challenges currently facing the automotive coatings industry include: traditional solvent-based coatings have high VOC emissions (>400g / L) and low solids content (generally below 60%), making it difficult to meet increasingly stringent environmental regulations; insufficient mechanical properties of the coatings result in poor abrasion resistance; and poor chemical resistance. Current non-aqueous dispersion (NAD) coatings use aliphatic hydrocarbons as the dispersion medium and are characterized by high solids content (up to 65%), low viscosity, and good application performance, but their resin preparation is difficult and domestic technological reserves are insufficient.

[0003] Therefore, there is a need to provide a coating composition with excellent comprehensive properties such as high solids content, low viscosity, abrasion resistance, anti-sagging, and chemical resistance. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned deficiencies of existing coatings by providing a high-solids, low-viscosity coating composition capable of producing coatings with excellent comprehensive properties, including low VOC, abrasion resistance, anti-sagging, and chemical resistance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A first aspect of the present invention provides an acrylic non-aqueous dispersion composition comprising the following components in parts by weight: 50-70 parts of non-aqueous acrylic acid dispersion, 20-30 parts of amino resin, 5-10 parts of nano-SiO2 modified non-aqueous acrylic acid dispersion, 2-4 parts of solvent, 0.1-0.5 parts of defoamer, 0.5-1 part of blocked drying agent, 1-2 parts of leveling agent, and 1-2 parts of anti-aging agent. The non-aqueous dispersion of acrylic acid is a dispersion with a solid content of 70-80%, and the active component in the dispersion includes the following components by weight: 5-10 parts of dispersion stabilizer, and 80-90 parts of random copolymer of acrylate having the structure shown in Formula I. Formula I The dispersant stabilizer is a propylene-based polyhydroxy fatty acid ester; The viscosity of the non-aqueous acrylic acid dispersion at 25°C is 1000~3000 cps.

[0006] As an embodiment of the present invention, the average particle size of the active component in the acrylic non-aqueous dispersion is 1~5μm.

[0007] As an embodiment of the present invention, in the random copolymer of acrylate with the structure shown in Formula I, the mass ratio of the segments with a degree of polymerization a, b, c, and d is (5~10):(5~10):(10~20):(15~25).

[0008] As an embodiment of the present invention, the non-aqueous dispersion of acrylic acid is prepared by a method comprising the following steps: S1: Dissolve 12-hydroxystearic acid in a nonpolar solvent and perform a self-polymerization reaction at 120-150°C for 1-1.5 h in an inert atmosphere; then add a monoepoxy compound and keep warm for 0.5-1 h to obtain a dispersion stabilizer; S2: After cooling to 100~120℃, add acrylate monomers, initiators and capping agents to the reaction system of step (1), react for 1~2 hours, and after the reaction is completed, emulsify with a polar solvent to a solid content of 70~80%; The acrylate monomers include methyl methacrylate, acrylic acid, hydroxyethyl acrylate, and isoamyl acrylate, with a mass ratio of methyl methacrylate: acrylic acid: hydroxyethyl acrylate: isoamyl acrylate = (5~10): (5~10): (10~20): (15~25).

[0009] As an embodiment of the present invention, the non-polar solvent mentioned in step S1 includes at least one of xylene, trimethylbenzene, and ethyl oleate.

[0010] As an embodiment of the present invention, the monoepoxy compound mentioned in step S1 includes at least one of phenyl glycidyl ether, propylene glycidyl ether, and dodecyl glycidyl ether.

[0011] As an embodiment of the present invention, in step S1, the molar ratio of 12-hydroxystearic acid and monoepoxy compound is (1~2):1.

[0012] As an embodiment of the present invention, the initiator includes at least one of benzoyl peroxide, tert-butyl peroxide, and azobisisobutyl cyanide.

[0013] As an embodiment of the present invention, the amount of the initiator added is 0.2 to 3.0 wt% of the total mass of the acrylate monomer and the capping agent.

[0014] As an embodiment of the present invention, the capping agent includes, but is not limited to, glycidyl isooctanoate.

[0015] As an embodiment of the present invention, the ratio of the total mass of the acrylic monomer to the mass of the capping agent is (35~65):(20~30).

[0016] As an embodiment of the present invention, in the nano-SiO2 modified acrylic non-aqueous dispersion, the amount of nano-SiO2 added is 10-20% of the mass of the acrylic non-aqueous dispersion.

[0017] As an embodiment of the present invention, the nano-SiO2 modified acrylic non-aqueous dispersion is prepared by a method comprising the following steps: S1: Adjust the pH of nano-SiO2 to 4-6 using organic acid, then add 1-5% of silane coupling agent by mass of nano-SiO2 and stir to mix evenly; S2: After heating to 70~80℃, add the non-aqueous dispersion of acrylic acid, stir and react for 30~45 minutes, cool down to below 30℃, filter, and the filter residue is the non-aqueous dispersion of acrylic acid modified with nano-SiO2.

[0018] As an embodiment of the present invention, the amino resin includes, but is not limited to, etherified amino resin.

[0019] As an embodiment of the present invention, the defoamer includes, but is not limited to, silicone defoamers.

[0020] As an embodiment of the present invention, the leveling agent includes, but is not limited to, acrylic leveling agents.

[0021] As an embodiment of the present invention, the blocked catalyst includes, but is not limited to, at least one of triphenyl phosphate and p-toluenesulfonic acid.

[0022] As an embodiment of the present invention, the anti-aging agent includes, but is not limited to, at least one of 3-[3-(2-benzotriazol-2-yl)-4-hydroxy-5-tert-butylphenyl]-propionic acid-polyethylene glycol 300 ester and 2-hydroxy-4-n-octyloxybenzophenone.

[0023] As an embodiment of the present invention, the solvent includes at least one of n-butanol and trimethylbenzene.

[0024] A second aspect of the present invention provides a method for preparing the acrylic non-aqueous dispersion composition described in the first aspect of the present invention, comprising the following steps: According to the weight parts of the components, all components are stirred evenly to obtain the acrylic non-aqueous dispersion composition.

[0025] A third aspect of the invention also provides the application of the acrylic non-aqueous dispersion composition described in the first aspect of the invention in the field of coating.

[0026] Compared with the prior art, the beneficial effects of the present invention are: This invention innovatively introduces a self-synthesized non-aqueous acrylic resin dispersion, which has high solids and low viscosity, good chemical resistance, and can work together with amino resin to significantly improve anti-sagging properties. The introduction of nano-SiO2 modified non-aqueous acrylic resin dispersion can also improve the wear resistance of the prepared coating. Detailed Implementation

[0027] To better illustrate the purpose, technical solution, and advantages of this invention, specific embodiments will be used to further describe the invention below. However, these embodiments do not limit the invention in any way. Unless otherwise specified, the reagents, methods, and equipment used in this invention are conventional reagents, methods, and equipment in this technical field. Unless otherwise specified, all reagents and materials used in this invention are commercially available.

[0028] In this invention, the technical features described in an open-ended manner include both closed-ended technical solutions composed of the listed features and open-ended technical solutions that include the listed features.

[0029] In this invention, numerical ranges are involved. Unless otherwise specified, the numerical ranges are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe features or characteristics, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are included.

[0030] Unless otherwise specified, all reagents or instruments used in this invention are commercially available products.

[0031] In a first aspect, an example of the present invention provides an acrylic non-aqueous dispersion composition comprising the following components in parts by weight: 50-70 parts of non-aqueous acrylic acid dispersion, 20-30 parts of amino resin, 5-10 parts of nano-SiO2 modified non-aqueous acrylic acid dispersion, 2-4 parts of solvent, 0.1-0.5 parts of defoamer, 0.5-1 part of blocked drying agent, 1-2 parts of leveling agent, and 1-2 parts of anti-aging agent. The non-aqueous dispersion of acrylic acid is a dispersion with a solid content of 70-80%, and the active component in the dispersion includes the following components by weight: 5-10 parts of dispersion stabilizer, and 80-90 parts of random copolymer of acrylate having the structure shown in Formula I. Formula I The dispersant stabilizer is a propylene-based polyhydroxy fatty acid ester; The viscosity of the non-aqueous acrylic acid dispersion at 25°C is 1000~3000 cps.

[0032] This invention innovatively introduces a self-synthesized non-aqueous acrylic resin dispersion, which exhibits high solids content and low viscosity. Even with a solids content of 70-80%, the viscosity can be maintained within a low range (1000-3000 cps), eliminating the need for large amounts of solvents in formulation and significantly reducing VOCs in the product. Furthermore, this resin is a pre-crosslinked oligomer existing in the composition as a dispersion, exhibiting excellent chemical resistance. The formulation of this invention further incorporates nano-SiO2-modified non-aqueous acrylic resin dispersion, which, in conjunction with the non-aqueous acrylic resin dispersion and amino resin, significantly enhances anti-sagging properties. The introduction of nano-SiO2 also improves the wear resistance of the prepared coating.

[0033] In some embodiments of the present invention, the average particle size of the active component in the non-aqueous acrylic acid dispersion is 1-5 μm. In the present invention, the average particle size of the active component in the non-aqueous acrylic acid dispersion is obtained by dynamic light scattering (DLS) testing.

[0034] In some embodiments of the present invention, in the random copolymer of acrylate with the structure shown in Formula I, the mass ratio of segments with a degree of polymerization a, b, c, and d is (5~10):(5~10):(10~20):(15~25). Maintaining the proportion of each segment within the above-mentioned suitable range can stabilize the dispersion of the active component in the non-aqueous acrylic dispersion, and the interaction between the segments gives the non-aqueous acrylic dispersion a certain degree of flexibility and polarity, maximizing the maintenance of high solids and low viscosity characteristics, and compatibility with other components in the system, thereby improving the overall performance of the prepared coating.

[0035] In some embodiments of the present invention, the non-aqueous acrylic dispersion is prepared by a method comprising the following steps: S1: Dissolve 12-hydroxystearic acid in a nonpolar solvent and perform a self-polymerization reaction at 120-150°C for 1-1.5 h in an inert atmosphere; then add a monoepoxy compound and keep warm for 0.5-1 h to obtain a dispersion stabilizer; S2: After cooling to 100~120℃, add acrylate monomers, initiators and capping agents to the reaction system of step (1), react for 1~2 hours, and after the reaction is completed, emulsify with a polar solvent to a solid content of 70~80%; The acrylate monomers include methyl methacrylate, acrylic acid, hydroxyethyl acrylate, and isoamyl acrylate, with a mass ratio of methyl methacrylate: acrylic acid: hydroxyethyl acrylate: isoamyl acrylate = (5~10): (5~10): (10~20): (15~25).

[0036] In some embodiments of the present invention, the nonpolar solvent mentioned in step S1 includes at least one of xylene, trimethylbenzene, and ethyl oleate.

[0037] In some embodiments of the present invention, the monoepoxy compound mentioned in step S1 includes at least one of phenyl glycidyl ether, propylene glycidyl ether, and dodecyl glycidyl ether.

[0038] In some embodiments of the present invention, in step S1, the molar ratio of 12-hydroxystearic acid and the monoepoxy compound is (1~2):1. The amount of 12-hydroxystearic acid and the monoepoxy compound used is within this range, which can enable the non-aqueous dispersion of acrylic acid to form a stable and uniform colloidal dispersion.

[0039] In some embodiments of the present invention, the initiator includes at least one selected from benzoyl peroxide, tert-butyl peroxide, and azobisisobutyl cyanide. Commonly used initiators in the art can all be used in the present invention, as long as they can initiate the polymerization reaction of the dispersion oligomers of the present invention.

[0040] In some embodiments of the present invention, the amount of the initiator added is 0.2 to 3.0 wt% of the total mass of the acrylate monomer and the capping agent.

[0041] In some embodiments of the present invention, the capping agent includes, but is not limited to, glycidyl isooctanoate.

[0042] In some embodiments of the present invention, the ratio of the total mass of the acrylic monomer to the mass of the capping agent is (35~65):(20~30).

[0043] In some embodiments of the present invention, the amount of nano-SiO2 added to the nano-SiO2-modified acrylic non-aqueous dispersion is 10-20% of the mass of the acrylic non-aqueous dispersion. Within this range, the amount of nano-SiO2 added can further improve the wear resistance of the prepared coating without affecting the dispersibility of the acrylic non-aqueous dispersion in the composition.

[0044] In some embodiments of the present invention, the nano-SiO2 modified acrylic non-aqueous dispersion is prepared by a method comprising the following steps: S1: Adjust the pH of nano-SiO2 to 4-6 using organic acid, then add 1-5% of silane coupling agent by mass of nano-SiO2 and stir to mix evenly; S2: After heating to 70~80℃, add the non-aqueous dispersion of acrylic acid, stir and react for 30~45 minutes, cool down to below 30℃, filter, and the filter residue is the non-aqueous dispersion of acrylic acid modified with nano-SiO2.

[0045] In this invention, the type of organic acid used to adjust pH in step S1 is not limited, as long as it has good compatibility with the non-aqueous dispersion of acrylic acid and does not cause phase separation. For example, the organic acid used in this invention can be at least one of cinnamic acid and phthalic acid.

[0046] In this invention, the type of silane coupling agent is not limited, and the silane coupling agent includes, but is not limited to, at least one of γ-aminopropyltriethoxysilane (KH550), γ-glycidoxypropyltrimethoxysilane (KH560), and γ-methacryloyloxypropyltrimethoxysilane (KH570).

[0047] In some embodiments of the present invention, the amino resin includes, but is not limited to, etherified amino resin, specifically at least one of methyl etherified amino resin and butyl etherified amino resin, preferably butyl etherified amino resin; the acid value of the etherified amino resin is between 0.3 and 0.5 mg KOH / g, and the viscosity at 23°C is between 8 and 49 Pa·s. Etherified amino resin is a resin formed by replacing the hydroxymethyl group in an amino resin with a methyl or butyl group. The higher the degree of etherification, the lower the corresponding acid value (also referred to as hydroxyl content in the art), the fewer crosslinkable hydroxymethyl active sites, the lower the degree of crosslinking of the prepared coating, and the lower the wear resistance and chemical resistance. The lower the degree of etherification, the higher the acid value. When mixed with acrylic non-aqueous dispersion, the intermolecular hydrogen bonding is significant, resulting in a lower initial viscosity of the composition; and the curing speed is fast (hydroxymethyl reactivity is high). When applied vertically (such as wall spraying), the coating begins to cure before it is completely leveled, easily forming "tear-like" drips and irregular crosslinked networks. Therefore, amino resins with acid values ​​and viscosities within the aforementioned suitable ranges can possess low viscosity, anti-sagging properties, abrasion resistance, and chemical resistance. The etherified amino resin can be selected from CYMEL 683 or CYMEL 659 butylated amino resins manufactured by Acer Inc., or Resimene BM_5901 butylated amino resin manufactured by INEOS.

[0048] In this invention, the type of defoamer is not particularly limited. Commonly used defoamers in the art can be used to prepare acrylic non-aqueous dispersion compositions in this invention. For example, the defoamer can be an organosilicon defoamer, specifically at least one of the organosilicon defoamers BYK-051, BYK-067A, and BYK-1751 produced by BYK Chemical Company of Germany.

[0049] In this invention, no particular limitation is made on the type of leveling agent. Commonly used leveling agents in the art can be used to prepare acrylic non-aqueous dispersion compositions in this invention. For example, the leveling agent can be an acrylic leveling agent with high compatibility with the composition system of this invention, specifically at least one of Allnex 9200 and Evka F20.

[0050] In this invention, the type of blocked catalyst is not particularly limited. Commonly used blocked catalysts in the art can be used to prepare acrylic non-aqueous dispersion compositions in this invention. For example, the blocked catalyst can be a blocked organic acid, and more specifically, it can be at least one of triphenyl phosphate and p-toluenesulfonic acid.

[0051] In this invention, the type of anti-aging agent is not particularly limited. Commonly used anti-aging agents in the art can be used to prepare acrylic non-aqueous dispersion compositions in this invention. For example, the anti-aging agent can be at least one of Tinuvin 1130 (3-[3-(2-benzotriazol-2-yl)-4-hydroxy-5-tert-butylphenyl]-propionic acid-polyethylene glycol 300) and Ciba 531 (2-hydroxy-4-n-octyloxybenzophenone) produced by BASF.

[0052] In some embodiments of the present invention, the solvent includes at least one of n-butanol and trimethylbenzene.

[0053] A second aspect of the present invention provides a method for preparing the acrylic non-aqueous dispersion composition described in the first aspect of the present invention, comprising the following steps: According to the weight parts of the components, all components are stirred evenly to obtain the acrylic non-aqueous dispersion composition.

[0054] In some embodiments of the present invention, all components may be added in small amounts multiple times during the mixing process. During the mixing process, the viscosity of the composition system is controlled to be maintained at 70-90 s at 25°C using a Forte 4 cup, and the solid content of the non-aqueous acrylic dispersion is 70-80%, with a viscosity of 1000-3000 cps at 25°C.

[0055] A third aspect of the invention provides the application of the acrylic non-aqueous dispersion composition described in the first aspect of the invention in the field of coating. More specifically, the acrylic non-aqueous dispersion composition is used as a coating material to prepare automotive primers or clear coats.

[0056] The following are specific embodiments of the present invention.

[0057] Information on some of the raw materials used in the embodiments of the present invention is listed below. Unless otherwise specified, all raw materials are commercially available products or are prepared by conventional means in the art: #1 Amino Resin: Butyl etherified amino resin, CYMEL 683, viscosity at 23℃ is 49 Pa·s, acid value is 0.3 mgKOH / g, purchased from Zyxel Corporation, USA; 2# Amino Resin: Butyl etherified amino resin, CYMEL 659, viscosity at 23℃ is 8 Pa·s, acid value is 0.5 mg KOH / g, purchased from Zyxel Corporation, USA; Defoamer: BYK-051, purchased from BYK GmbH, Germany; Blocked drying agent: Triphenyl phosphate, commercially available; Leveling agent: Allnex 9200, purchased from Allnex Technologies, Inc., USA; Anti-aging agent: BASF Tinuvin 1130; n-Butanol: Commercially available; Trimethylbenzene: S-100 solvent oil, purchased from Shandong Hongshuo Chemical Technology Co., Ltd.; The non-aqueous dispersion of acrylic acid was prepared in-house, and the preparation method included the following steps: S1: Add S-100 solvent oil to the reactor, heat to 120°C, introduce nitrogen gas, add 12-hydroxystearic acid to dissolve it in S-100 solvent oil, stir and react for 1.2 h, then add monoepoxy compound phenyl glycidyl ether dropwise, keep warm for 0.5 h after the addition is complete to obtain the dispersion stabilizer - propylene-based polyhydroxy fatty acid ester. The molar ratio of 12-hydroxystearic acid (A) to phenyl glycidyl ether (B) is A:B = 1.5:1. S2: After cooling to 110℃, add acrylate monomers, initiator benzoyl peroxide, and end-capping agent glycidyl isooctanoate to the reaction system of step (1) according to the weight parts described in Table 1. React for 1.5h. After the reaction is completed, emulsify with the polar solvent propylene glycol methyl ether acetate to a non-aqueous acrylic acid dispersion (NAD) with a solid content of 75%. See Table 1 for the particle size and viscosity information of the non-aqueous acrylic acid dispersion.

[0058] In Table 1, the average particle size of the non-aqueous acrylic acid dispersion was obtained by dynamic light scattering (DLS); the viscosity of the non-aqueous acrylic acid dispersion was measured at 25°C using a rotational viscometer.

[0059] Table 1. Non-aqueous dispersions of acrylic acid The preparation of nano-SiO2 (nano silicon dioxide, abbreviated as NSD in the embodiments of this invention) modified acrylic non-aqueous dispersion includes the following steps: S1: Adjust the pH of nano-SiO2 (DK-SiO2-60, particle size 60nm, purchased from Deco Island Gold) to 6 using an organic acid (phthalic acid), then add 15% of the mass of nano-SiO2 as silane coupling agent KH-550 and stir to mix evenly. S2: After heating to 80°C, add the acrylic non-aqueous dispersion prepared above, stir and react for 45 min, cool to below 30°C, filter, and the obtained filter residue is the nano-SiO2 modified acrylic non-aqueous dispersion. The nano-SiO2 modified acrylic non-aqueous dispersion is abbreviated as NSD@NAD in the following description of the embodiments of the present invention.

[0060] Examples 1-9, Comparative Examples 1-4 A series of acrylic non-aqueous dispersion compositions are provided, the raw material composition of which is shown in Table 2 (the numbers represent the parts by weight of the raw material), and the preparation method includes the following steps: According to the weight parts of the components described in Table 2, all components are stirred evenly to obtain the acrylic non-aqueous dispersion composition. During the stirring and mixing process, the components can be added in small amounts multiple times. During the stirring process, the viscosity of the composition system at 25°C in the Fore-4 cup should be maintained within the range of 70~90s.

[0061] Table 2. Acrylic non-aqueous dispersion compositions (parts by weight) Table 3. Acrylic non-aqueous dispersion compositions (parts by weight) Comparative Example 5 An acrylic composition is provided, prepared according to the method of Example 1, except that: the non-aqueous acrylic acid dispersion NAD-1 and the nano-SiO2-modified non-aqueous acrylic acid dispersion NSD@NAD-1 are not added; instead, they are replaced with reaction raw materials in the same weight proportions as those in Example 1 ("non-aqueous acrylic acid dispersion NAD-1 and nano-SiO2-modified non-aqueous acrylic acid dispersion NSD@NAD-1"). That is, this comparative example did not prepare a non-aqueous dispersion of acrylic acid in advance, but rather mixed all raw materials to obtain an acrylic composition.

[0062] Performance testing The properties of the compositions prepared in the above examples and comparative examples were tested as follows: 1. Viscosity s (T-4 cup): The test was conducted using a Forte-4 cup at a temperature of 25°C. 2. Solid content: The composition was subjected to rotary evaporation until it was evaporated into a powder, and the following calculations were performed: Solid content (%) = m2 / m1 × 100%, where m2 represents the mass of the powder after evaporation and m1 represents the mass of the composition; 3. VOC (g / L): Tested according to standard GB / T23985-2009; 4. Thermal storage stability Place the mixture at 50°C for 30 days and observe whether any precipitation occurs. No precipitation indicates "passing" and precipitation or stratification indicates "failing". 5. The above composition is sprayed onto the surface of a substrate (e.g., steel plate) and heat-cured at 140°C for 0.5 hours to obtain a coating. The performance of the prepared coating is then tested. 5.1 Gloss The test was conducted according to the standard GB / T 9754-2025, with a geometric condition of 20°. 5.2 Resistant to acids / alkalis / water (1) The acid resistance test shall be conducted in accordance with the standard GB / T 9278-2008. The medium is a 5% sulfuric acid solution by mass, and the test shall be conducted using method A (immersion method) in the test procedure. (2) The acid resistance test shall be conducted in accordance with the standard GB / T 9278-2008. The medium is a 5% sodium hydroxide solution by mass, and the test shall be conducted using method A (immersion method) in the test procedure. (3) The water resistance test shall be conducted in accordance with the standard GB / T 5209-1985, and the test temperature shall be 40℃; 5.3 Abrasion resistance According to the standard ASTM D4060, use a CS-17 grinding wheel to rub back and forth on the coating surface 1000 times and record the mass (mg) of the coating worn away. 5.4 Anti-sagging performance The test was conducted using a sagging tester; a higher value indicates better sagging resistance. The test results are shown in Table 4.

[0063] Table 4 The above results indicate that: The composition of the present invention has the characteristics of high solids and low viscosity, and the coating prepared has good acid and alkali resistance, water resistance, wear resistance and anti-sagging properties, especially excellent anti-sagging properties.

[0064] No dispersant stabilizer was added to the non-aqueous acrylic dispersion in Comparative Example 1, resulting in poor thermal storage stability of the composition and reduced acid and alkali resistance and water resistance of the prepared coating.

[0065] In Comparative Example 2, replacing the amino resin with the commonly used vinyl resin significantly reduced the coating's anti-sagging properties, acid and alkali resistance, and water resistance.

[0066] In Comparative Example 3, the nano-silica was dispersed in the composition without being modified with the non-aqueous dispersion of acrylic acid. The resulting composition exhibited poorer thermal stability, decreased gloss, poorer anti-sagging properties, and worse abrasion resistance compared to the examples.

[0067] In Comparative Example 4, the non-aqueous acrylic dispersion without nano-silica modification resulted in a significant decrease in the wear resistance and anti-sagging properties of the prepared coating.

[0068] Comparative Example 5 involved physically mixing the raw materials for preparing the non-aqueous dispersion of acrylic acid with other components in the composition, without pre-preparing a non-aqueous dispersion of acrylic acid prepolymer colloid. Although the composition could still maintain the characteristics of high solids and low viscosity, the performance of the resulting coating was significantly worse.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An acrylic non-aqueous dispersion composition, characterized in that, The components include the following parts by weight: 50-70 parts of non-aqueous acrylic acid dispersion, 20-30 parts of amino resin, 5-10 parts of nano-SiO2 modified non-aqueous acrylic acid dispersion, 2-4 parts of solvent, 0.1-0.5 parts of defoamer, 0.5-1 part of blocked drying agent, 1-2 parts of leveling agent, and 1-2 parts of anti-aging agent. The non-aqueous dispersion of acrylic acid is a dispersion with a solid content of 70-80%, and the active component in the dispersion includes the following components by weight: 5-10 parts of dispersion stabilizer, and 80-90 parts of random copolymer of acrylate having the structure shown in Formula I. Formula I The dispersant stabilizer is a propylene-based polyhydroxy fatty acid ester; The viscosity of the non-aqueous acrylic acid dispersion at 25°C is 1000~3000 cps.

2. The acrylic non-aqueous dispersion composition according to claim 1, characterized in that, The average particle size of the active component in the non-aqueous acrylic dispersion is 1~5 μm.

3. The acrylic non-aqueous dispersion composition according to claim 1, characterized in that, In the random copolymer of acrylate with the structure shown in Formula I, the mass ratio of the segments with degree of polymerization a, b, c, and d is (5~10):(5~10):(10~20):(15~25).

4. The acrylic non-aqueous dispersion composition according to claim 1, characterized in that, The non-aqueous acrylic acid dispersion was prepared by a method comprising the following steps: S1: Dissolve 12-hydroxystearic acid in a nonpolar solvent and perform a self-polymerization reaction at 120-150°C for 1-1.5 h in an inert atmosphere; then add a monoepoxy compound and keep warm for 0.5-1 h to obtain a dispersion stabilizer; S2: After cooling to 100~120℃, add acrylate monomers, initiators and capping agents to the reaction system of step (1), react for 1~2 hours, and after the reaction is completed, emulsify with a polar solvent to a solid content of 70~80%; The acrylate monomers include methyl methacrylate, acrylic acid, hydroxyethyl acrylate, and isoamyl acrylate, with a mass ratio of methyl methacrylate: acrylic acid: hydroxyethyl acrylate: isoamyl acrylate = (5~10): (5~10): (10~20): (15~25).

5. The acrylic non-aqueous dispersion composition according to claim 4, characterized in that, It satisfies at least one of the following characteristics: (1) The non-polar solvent mentioned in step S1 includes at least one of xylene, trimethylbenzene, and ethyl oleate; (2) The monoepoxy compound mentioned in step S1 includes at least one of phenyl glycidyl ether, propenyl glycidyl ether, and dodecyl glycidyl ether; (3) In step S1, the molar ratio of 12-hydroxystearic acid and monoepoxy compound is (1~2):1; (4) The initiator mentioned in step S2 includes at least one of benzoyl peroxide, tert-butyl peroxide, and azobisisobutyl cyanide; the amount of the initiator added is 0.2 to 3.0 wt% of the total mass of the acrylate monomer and the capping agent. (5) The capping agent includes glycidyl isooctanoate; (6) In step S2, the ratio of the total mass of the acrylic monomer to the mass of the capping agent is (35~65):(20~30).

6. The acrylic non-aqueous dispersion composition according to claim 1, characterized in that, In the nano-SiO2 modified acrylic non-aqueous dispersion, the amount of nano-SiO2 added is 10-20% of the mass of the acrylic non-aqueous dispersion.

7. The acrylic non-aqueous dispersion composition according to claim 1, characterized in that, The nano-SiO2 modified acrylic non-aqueous dispersion was prepared by a method comprising the following steps: S1: Adjust the pH of nano-SiO2 to 4-6 using organic acid, then add 1-5% of silane coupling agent by mass of nano-SiO2 and stir to mix evenly; S2: After heating to 70~80℃, add the non-aqueous dispersion of acrylic acid, stir and react for 30~45 minutes, cool down to below 30℃, filter, and the filter residue is the non-aqueous dispersion of acrylic acid modified with nano-SiO2.

8. The acrylic non-aqueous dispersion composition according to claim 1, characterized in that, It satisfies at least one of the following characteristics: (1) The amino resin includes etherified amino resin; (2) The defoamer includes silicone defoamers; (3) The leveling agent includes an acrylic leveling agent; (4) The blocked catalyst includes at least one of triphenyl phosphate and p-toluenesulfonic acid; (5) The anti-aging agent includes at least one of 3-[3-(2-benzotriazol-2-yl)-4-hydroxy-5-tert-butylphenyl]-propionic acid-polyethylene glycol 300 ester and 2-hydroxy-4-n-octyloxybenzophenone; (6) The solvent includes at least one of n-butanol and tricresylbenzene.

9. A method for preparing the acrylic non-aqueous dispersion composition according to any one of claims 1 to 8, characterized in that, Includes the following steps: According to the weight parts of the components, all components are stirred evenly to obtain the acrylic non-aqueous dispersion composition.

10. The use of the acrylic non-aqueous dispersion composition according to any one of claims 1 to 8 in the field of coating.

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