UV curable resin composition and preparation method thereof

Abstract

The invention provides a UV curable resin composition and a preparation method thereof, and is characterized in that the preparation method comprises the following steps: (1) mixing 30-40 parts by weight of polyol, 20-30 parts by weight of polybasic acid, 40-50 parts by weight of fatty acid and 90-100 parts by weight of xylene, heating to 180-200 DEG C, and reacting to obtain alkyd resin; (2) mixing 30-40 parts by weight of an ester compound and 40-50 parts by weight of isophorone diisocyanate, adding hydroquinone and dibutyltin dilaurate, and carrying out a reaction at 80-90 DEG C to obtain acrylic acid modified polyurethane; and (4) adding alkyd resin, the modified titanium dioxide and the modified kaolin into the acrylic acid modified polyurethane, and reacting at 70-80 DEG C for 2-3 hours to obtain the UV curing resin. The UV-curable resin composition provided by the invention can improve the adhesive force, wear resistance, salt fog resistance and water boiling performance of colored paint.

Description

Technical Field

[0001] The invention belongs to the technical field of resins, and in particular relates to a UV curable resin composition and a preparation method thereof. Background Art

[0002] UV-curable resin is a polymer material that can be cured quickly under ultraviolet (UV) light. This material usually contains one or more photo-initiated prepolymers, monomers and photoinitiators. When these resins are exposed to a UV light source, the photoinitiator absorbs UV energy and activates, which in turn triggers a chemical reaction between the prepolymer and the monomer, causing the resin to change from a liquid to a solid state. This process, called UV curing or light curing, has the following characteristics: Fast curing: UV-curable resins can be cured within seconds to minutes, greatly improving production efficiency and suitable for applications that require rapid prototyping or mass production. Energy saving and environmental protection: Compared with traditional thermal curing methods, UV curing has low energy consumption and produces fewer volatile organic compounds (VOCs), which is beneficial to environmental protection. Excellent performance: The cured resin has good mechanical properties, chemical resistance, wear resistance and gloss, and is suitable for a variety of industrial and commercial uses. Wide application: UV-curable resins are widely used in coatings, inks, adhesives, printed circuit board manufacturing, optical fiber coatings, decoration manufacturing, 3D printing (especially SLA / DLP technology) and other fields. Easy to operate: Since its curing conditions are clear and rapid, it can be carried out at room temperature without high-temperature baking, which simplifies the processing process.

[0003] Paint, also commonly known as colored paint or coloring paint, refers to a paint that adds pigments or other colorants to the base paint (such as varnish) to achieve a specific color effect. Paint is widely used in many fields such as architectural decoration, furniture coating, automotive spray painting, and artistic creation. Its main composition and characteristics include: The main ingredients include resin: as the basis of the paint, it provides adhesion and film-forming properties, affecting the hardness, gloss and durability of the paint film. Solvent: used to dilute resin and pigment to make it easy to apply. After application, the solvent evaporates and the paint film solidifies. Pigment: gives color to the paint, which can be inorganic or organic pigments, affecting the hiding power, color brightness and weather resistance of the paint film. Additives: including dispersants, leveling agents, anti-settling agents, defoaming agents, etc., used to improve the storage stability, construction performance and final paint film performance of the paint. The characteristics of paint are: Rich colors: almost any color can be formulated as needed. Hiding power: depending on the type and amount of pigment, the paint can provide a covering effect from translucent to completely covering. Decorative: enhance the beauty of objects and enhance visual effects. Protectiveness: The paint film can prevent objects from moisture, corrosion, UV damage, etc., and extend the service life. Diversification: Depending on the use environment and needs, there are many types of paints, such as latex paint, alkyd paint, epoxy paint, polyurethane paint, etc. Application areas include: Architectural decoration: interior and exterior wall coatings, providing beauty and protection. Furniture painting: Improving the beauty and durability of furniture. Automotive industry: Car body painting, not only beautifies the vehicle, but also provides anti-rust and anti-scratch functions; Art creation: Oil painting, lacquer painting, etc., for artistic expression and work protection; Electronic products: Provide color and protective layer for electronic equipment.

[0004] However, the existing UV curable resins used to prepare color paints cannot achieve good performance in adhesion, wear resistance, salt spray resistance and water boiling test. Therefore, there is an urgent need for a UV curable resin composition and a preparation method thereof to improve the performance of the existing UV curable resins. Summary of the invention

[0005] The object of the present invention is to provide a UV curable resin composition and a preparation method thereof.

[0006] In order to achieve the above object, the present invention provides the following technical solution: a method for preparing a UV curable resin composition, the preparation method comprising the following steps: (1) Mix 30-40 parts of polyol, 20-30 parts of polyacid, 40-50 parts of fatty acid and 90-100 parts of xylene by weight, heat to 180-200° C., react until the acid value of the system reaches 10-12 mgKOH / g, and cool to 30-35° C. to obtain an alkyd resin; wherein the polyol is a mixture of propylene glycol, ethyl butyl propylene glycol and glycerol in a mass ratio of 1:1.3-1.5:0.2-0.6; (2) 30-40 parts by weight of an ester compound and 40-50 parts by weight of isophorone diisocyanate are mixed, and hydroquinone and dibutyltin dilaurate are added, and the mixture is reacted at 80-90° C. until the mass fraction of the hydroxyl group reaches 0.1-0.2%, and the temperature is lowered to 30-35° C. to obtain an acrylic modified polyurethane; (4) adding 200-240 parts by weight of alkyd resin, 30-40 parts by weight of modified titanium dioxide and 10-20 parts by weight of modified kaolin to acrylic modified polyurethane, reacting at 70-80° C. for 2-3 hours to obtain a UV curable resin; The preparation method of the modified titanium dioxide is as follows: 10-15 parts by mass of polyacrylate emulsion, 3-5 parts by mass of titanium dioxide and 100 parts by mass of water are mixed evenly, and ultrasonically dispersed at 30-34 kHz for 25-30 minutes to obtain a mixture; the mixture is stirred evenly and heated to 90°C-96°C, and kept warm for reaction for 2-3 hours to obtain a reaction product; the reaction product is filtered, dried and crushed to obtain the modified titanium dioxide.

[0007] Furthermore, the polyacid is selected from at least one of phthalic anhydride, terephthalic acid, and adipic acid.

[0008] Furthermore, the polyacid is a compound of phthalic anhydride, terephthalic acid and adipic acid in a mass ratio of 1:0.2-0.4:1.5-1.9.

[0009] Furthermore, the fatty acid is at least one of eleostearic acid, oleic acid, linolenic acid and soy oil acid.

[0010] Furthermore, the ester compound is selected from at least one of hydroxyethyl acrylate, hydroxypropyl acrylate and hydroxyethyl methacrylate.

[0011] Furthermore, the ester compound is a mixture of hydroxyethyl acrylate, hydroxypropyl acrylate and hydroxyethyl methacrylate in a mass ratio of 0.4-0.8:1:1.3-1.7.

[0012] Furthermore, the weight percentage of hydroquinone in the ester compound is 0.4%-0.9%.

[0013] Furthermore, the weight percentage of dibutyltin dilaurate in isophorone diisocyanate is 1%-2%.

[0014] Furthermore, the preparation method of modified kaolin is as follows: by weight, 3-5 parts of silane coupling agent KH550 are added to 300-400 parts of ethanol, mixed evenly, and then 100 parts of kaolin and 1-3 parts of calcium stearate are added, mixed at 73-76° C., and stirred for 10-15 minutes; the temperature is raised to 80-90° C., and then 7-9 parts of isopropyl distearoyloxyaluminate are added, stirred for 10-20 minutes, filtered to obtain a solid, and dried to obtain modified kaolin.

[0015] The invention also provides a UV curable resin composition prepared by the preparation method.

[0016] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: the present invention provides a UV-curable resin composition and a preparation method thereof, which is prepared by selecting polyols and polyacids in a specific ratio, and adding modified titanium dioxide and modified kaolin, which work synergistically to improve the adhesion, wear resistance, salt spray resistance and water boiling performance of the paint. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example 1 This embodiment provides a UV curable resin composition, and the preparation method comprises the following steps: (1) Mix 30 parts of polyol, 20 parts of polyacid, 40 parts of fatty acid and 90 parts of xylene by weight, heat to 180° C., react until the acid value of the system reaches 10 mgKOH / g, and cool to 30° C. to obtain an alkyd resin; wherein the polyol is a mixture of propylene glycol, ethyl butyl propylene glycol and glycerol in a mass ratio of 1:1.3:0.2; (2) 30 parts by weight of an ester compound and 40 parts by weight of isophorone diisocyanate are mixed, and hydroquinone and dibutyltin dilaurate are added, and the mixture is reacted at 80° C. until the mass fraction of the hydroxyl group reaches 0.1%, and the temperature is lowered to 30° C. to obtain an acrylic modified polyurethane; (4) adding 200 parts by weight of alkyd resin, 30 parts by weight of modified titanium dioxide and 10 parts by weight of modified kaolin to acrylic modified polyurethane, reacting at 70° C. for 2 h to obtain a UV curable resin; The preparation method of the modified titanium dioxide is as follows: 10 parts by mass of polyacrylate emulsion, 3 parts by mass of titanium dioxide and 100 parts by mass of water are mixed evenly, and ultrasonically dispersed at 30 kHz for 25 minutes to obtain a mixture; the mixture is stirred evenly and heated to 90°C, and kept warm for 2 hours to obtain a reaction product; the reaction product is filtered, dried and crushed to obtain the modified titanium dioxide.

[0019] The polyacid is a mixture of phthalic anhydride, terephthalic acid and adipic acid in a mass ratio of 1:0.2:1.5.

[0020] The fatty acid is eleostearic acid.

[0021] The ester compound is a mixture of hydroxyethyl acrylate, hydroxypropyl acrylate and hydroxyethyl methacrylate in a mass ratio of 0.4:1:1.3.

[0022] The weight percentage of hydroquinone in the ester compound is 0.4%.

[0023] The weight percentage of dibutyltin dilaurate in isophorone diisocyanate is 2%.

[0024] The preparation method of modified kaolin is as follows: by weight, 3 parts of silane coupling agent KH550 are added to 300 parts of ethanol, mixed evenly, and then 100 parts of kaolin and 1 part of calcium stearate are added, mixed at 73° C., and stirred for 10 minutes; the temperature is raised to 80° C., and then 7 parts of isopropyl distearoyloxyaluminate are added, stirred for 10 minutes, filtered to obtain a solid, and dried to obtain modified kaolin.

[0025] Example 2 This embodiment provides a UV curable resin composition, and the preparation method comprises the following steps: (1) In parts by weight, 40 parts of polyol, 30 parts of polyacid, 50 parts of fatty acid and 100 parts of xylene are mixed, the temperature is raised to 200° C., the reaction is carried out until the acid value of the system reaches 12 mgKOH / g, and the temperature is lowered to 35° C. to obtain an alkyd resin; wherein the polyol is a mixture of propylene glycol, ethyl butyl propylene glycol and glycerol in a mass ratio of 1:1.5:0.6; (2) 40 parts by weight of an ester compound and 50 parts by weight of isophorone diisocyanate are mixed, and hydroquinone and dibutyltin dilaurate are added, and the mixture is reacted at 90° C. until the mass fraction of the hydroxyl group reaches 0.2%, and the temperature is lowered to 35° C. to obtain an acrylic modified polyurethane; (4) adding 240 parts by weight of alkyd resin, 40 parts by weight of modified titanium dioxide and 20 parts by weight of modified kaolin to acrylic modified polyurethane, reacting at 80° C. for 3 h to obtain a UV curable resin; The preparation method of the modified titanium dioxide is as follows: 15 parts by mass of polyacrylate emulsion, 5 parts by mass of titanium dioxide and 100 parts by mass of water are mixed evenly, and ultrasonically dispersed at 34 kHz for 30 minutes to obtain a mixture; the mixture is stirred evenly and heated to 96°C, and kept warm for reaction for 3 hours to obtain a reaction product; the reaction product is filtered, dried and crushed to obtain the modified titanium dioxide.

[0026] The polyacid is a mixture of phthalic anhydride, terephthalic acid and adipic acid in a mass ratio of 1:0.4:1.9.

[0027] The fatty acid is oleic acid.

[0028] The ester compound is a mixture of hydroxyethyl acrylate, hydroxypropyl acrylate and hydroxyethyl methacrylate in a mass ratio of 0.8:1:1.7.

[0029] The weight percentage of hydroquinone in the ester compound is 0.9%.

[0030] The weight percentage of dibutyltin dilaurate in isophorone diisocyanate is 2%.

[0031] The preparation method of modified kaolin is as follows: by weight, 5 parts of silane coupling agent KH550 are added to 400 parts of ethanol, mixed evenly, and then 100 parts of kaolin and 3 parts of calcium stearate are added, mixed, and stirred at 76°C for 15 minutes; the temperature is raised to 90°C, and 9 parts of isopropyl distearoyloxyaluminate are added, stirred for 20 minutes, filtered to obtain a solid, and dried to obtain modified kaolin.

[0032] Example 3 A method for preparing a UV curable resin composition, the preparation method comprising the following steps: (1) In parts by weight, 40 parts of polyol, 20 parts of polyacid, 50 parts of fatty acid and 90 parts of xylene are mixed, the temperature is raised to 200° C., reacted until the acid value of the system reaches 10 mgKOH / g, and the temperature is lowered to 35° C. to obtain an alkyd resin; wherein the polyol is a mixture of propylene glycol, ethyl butyl propylene glycol and glycerol in a mass ratio of 1: 1.5: 0.6; (2) 30 parts by weight of an ester compound and 50 parts by weight of isophorone diisocyanate are mixed, and hydroquinone and dibutyltin dilaurate are added, and the mixture is reacted at 80° C. until the mass fraction of the hydroxyl group reaches 0.2%, and the temperature is lowered to 30° C. to obtain an acrylic modified polyurethane; (4) adding 240 parts by weight of alkyd resin, 30 parts by weight of modified titanium dioxide and 20 parts by weight of modified kaolin to acrylic modified polyurethane, reacting at 70° C. for 3 hours to obtain a UV curable resin; The preparation method of the modified titanium dioxide is as follows: 10 parts by mass of polyacrylate emulsion, 5 parts by mass of titanium dioxide and 100 parts by mass of water are mixed evenly, and ultrasonically dispersed at 30 kHz for 30 minutes to obtain a mixture; the mixture is stirred evenly and heated to 90°C, and kept warm for reaction for 3 hours to obtain a reaction product; the reaction product is filtered, dried and crushed to obtain the modified titanium dioxide.

[0033] The polyacid is a mixture of phthalic anhydride, terephthalic acid and adipic acid in a mass ratio of 1:0.4:1.5.

[0034] The fatty acid is eleostearic acid.

[0035] The ester compound is a mixture of hydroxyethyl acrylate, hydroxypropyl acrylate and hydroxyethyl methacrylate in a mass ratio of 0.8:1:1.3.

[0036] The weight percentage of hydroquinone in the ester compound is 0.4%.

[0037] The weight percentage of dibutyltin dilaurate in isophorone diisocyanate is 2%.

[0038] Furthermore, the preparation method of modified kaolin is as follows: by weight, 5 parts of silane coupling agent KH550 are added to 300 parts of ethanol, mixed evenly, and then 100 parts of kaolin and 3 parts of calcium stearate are added, mixed, and stirred at 73°C for 15 minutes; the temperature is raised to 8°C, and 9 parts of isopropyl distearoyloxyaluminate are added, stirred for 10 minutes, filtered to obtain a solid, and dried to obtain modified kaolin.

[0039] Comparative Example 1 The difference between this comparative example and Example 1 is that the polyol, polyacid and ester compound are all single components.

[0040] A UV curable resin composition, the preparation method comprising the following steps: (1) By weight, 30 parts of polyol, 20 parts of polyacid, 40 parts of fatty acid and 90 parts of xylene are mixed, the temperature is raised to 180° C., reacted until the acid value of the system reaches 10 mgKOH / g, and the temperature is lowered to 30° C. to obtain an alkyd resin; wherein the polyol is propylene glycol; (2) 30 parts by weight of an ester compound and 40 parts by weight of isophorone diisocyanate are mixed, and hydroquinone and dibutyltin dilaurate are added, and the mixture is reacted at 80° C. until the mass fraction of the hydroxyl group reaches 0.1%, and the temperature is lowered to 30° C. to obtain an acrylic modified polyurethane; (4) adding 200 parts by weight of alkyd resin, 30 parts by weight of modified titanium dioxide and 10 parts by weight of modified kaolin to acrylic modified polyurethane, reacting at 70° C. for 2 h to obtain a UV curable resin; The preparation method of the modified titanium dioxide is as follows: 10 parts by mass of polyacrylate emulsion, 3 parts by mass of titanium dioxide and 100 parts by mass of water are mixed evenly, and ultrasonically dispersed at 30 kHz for 25 minutes to obtain a mixture; the mixture is stirred evenly and heated to 90°C, and kept warm for 2 hours to obtain a reaction product; the reaction product is filtered, dried and crushed to obtain the modified titanium dioxide.

[0041] The polyacid is phthalic anhydride.

[0042] The fatty acid is eleostearic acid.

[0043] The ester compound is hydroxyethyl acrylate.

[0044] The weight percentage of hydroquinone in the ester compound is 0.4%.

[0045] The weight percentage of dibutyltin dilaurate in isophorone diisocyanate is 1%.

[0046] The preparation method of modified kaolin is as follows: by weight, 3 parts of silane coupling agent KH550 are added to 300 parts of ethanol, mixed evenly, and then 100 parts of kaolin and 1 part of calcium stearate are added, mixed at 73° C., and stirred for 10 minutes; the temperature is raised to 80° C., and then 7 parts of isopropyl distearoyloxyaluminate are added, stirred for 10 minutes, filtered to obtain a solid, and dried to obtain modified kaolin.

[0047] Comparative Example 2 The difference between this comparative example and Example 1 is that modified titanium dioxide is not included.

[0048] A UV curable resin composition, the preparation method comprising the following steps: (1) Mix 30 parts of polyol, 20 parts of polyacid, 40 parts of fatty acid and 90 parts of xylene by weight, heat to 180° C., react until the acid value of the system reaches 10 mgKOH / g, and cool to 30° C. to obtain an alkyd resin; wherein the polyol is a mixture of propylene glycol, ethyl butyl propylene glycol and glycerol in a mass ratio of 1:1.3:0.2; (2) 30 parts by weight of an ester compound and 40 parts by weight of isophorone diisocyanate are mixed, and hydroquinone and dibutyltin dilaurate are added, and the mixture is reacted at 80° C. until the mass fraction of the hydroxyl group reaches 0.1%, and the temperature is lowered to 30° C. to obtain an acrylic modified polyurethane; (4) Add 200 parts by weight of alkyd resin and 40 parts by weight of modified kaolin to acrylic modified polyurethane, react at 70° C. for 2 h, and obtain a UV curable resin.

[0049] The polyacid is a mixture of phthalic anhydride, terephthalic acid and adipic acid in a mass ratio of 1:0.2:1.5.

[0050] The fatty acid is eleostearic acid.

[0051] The ester compound is a mixture of hydroxyethyl acrylate, hydroxypropyl acrylate and hydroxyethyl methacrylate in a mass ratio of 0.4:1:1.3.

[0052] The weight percentage of hydroquinone in the ester compound is 0.4%.

[0053] The weight percentage of dibutyltin dilaurate in isophorone diisocyanate is 1%.

[0054] The preparation method of modified kaolin is as follows: by weight, 3 parts of silane coupling agent KH550 are added to 300 parts of ethanol, mixed evenly, and then 100 parts of kaolin and 1 part of calcium stearate are added, mixed at 73° C., and stirred for 10 minutes; the temperature is raised to 80° C., and then 7 parts of isopropyl distearoyloxyaluminate are added, stirred for 10 minutes, filtered to obtain a solid, and dried to obtain modified kaolin.

[0055] Comparative Example 3 The difference between this comparative example and Example 1 is that modified kaolin is not included.

[0056] A UV curable resin composition, the preparation method comprising the following steps: (1) Mix 30 parts of polyol, 20 parts of polyacid, 40 parts of fatty acid and 90 parts of xylene by weight, heat to 180° C., react until the acid value of the system reaches 10 mgKOH / g, and cool to 30° C. to obtain an alkyd resin; wherein the polyol is a mixture of propylene glycol, ethyl butyl propylene glycol and glycerol in a mass ratio of 1:1.3:0.2; (2) 30 parts by weight of an ester compound and 40 parts by weight of isophorone diisocyanate are mixed, and hydroquinone and dibutyltin dilaurate are added, and the mixture is reacted at 80° C. until the mass fraction of the hydroxyl group reaches 0.1%, and the temperature is lowered to 30° C. to obtain an acrylic modified polyurethane; (4) adding 200 parts by weight of alkyd resin and 40 parts by weight of modified titanium dioxide to acrylic modified polyurethane, reacting at 70° C. for 2 h to obtain a UV curable resin; The preparation method of the modified titanium dioxide is as follows: 10 parts by mass of polyacrylate emulsion, 3 parts by mass of titanium dioxide and 100 parts by mass of water are mixed evenly, and ultrasonically dispersed at 30 kHz for 25 minutes to obtain a mixture; the mixture is stirred evenly and heated to 90°C, and kept warm for 2 hours to obtain a reaction product; the reaction product is filtered, dried and crushed to obtain the modified titanium dioxide.

[0057] The polyacid is a mixture of phthalic anhydride, terephthalic acid and adipic acid in a mass ratio of 1:0.2:1.5.

[0058] The fatty acid is eleostearic acid.

[0059] The ester compound is a mixture of hydroxyethyl acrylate, hydroxypropyl acrylate and hydroxyethyl methacrylate in a mass ratio of 0.4:1:1.3.

[0060] The weight percentage of hydroquinone in the ester compound is 0.4%.

[0061] The weight percentage of dibutyltin dilaurate in isophorone diisocyanate is 1%.

[0062] Comparative Example 4 The difference between this comparative example and Example 1 is that the contents of modified titanium dioxide and modified kaolin are different.

[0063] A UV curable resin composition, the preparation method comprising the following steps: (1) Mix 30 parts of polyol, 20 parts of polyacid, 40 parts of fatty acid and 90 parts of xylene by weight, heat to 180° C., react until the acid value of the system reaches 10 mgKOH / g, and cool to 30° C. to obtain an alkyd resin; wherein the polyol is a mixture of propylene glycol, ethyl butyl propylene glycol and glycerol in a mass ratio of 1:1.3:0.2; (2) 30 parts by weight of an ester compound and 40 parts by weight of isophorone diisocyanate are mixed, and hydroquinone and dibutyltin dilaurate are added, and the mixture is reacted at 80° C. until the mass fraction of the hydroxyl group reaches 0.1%, and the temperature is lowered to 30° C. to obtain an acrylic modified polyurethane; (4) adding 200 parts by weight of alkyd resin, 10 parts by weight of modified titanium dioxide and 30 parts by weight of modified kaolin to acrylic modified polyurethane, reacting at 70° C. for 2 h to obtain a UV curable resin; The preparation method of the modified titanium dioxide is as follows: 10 parts by mass of polyacrylate emulsion, 3 parts by mass of titanium dioxide and 100 parts by mass of water are mixed evenly, and ultrasonically dispersed at 30 kHz for 25 minutes to obtain a mixture; the mixture is stirred evenly and heated to 90°C, and kept warm for 2 hours to obtain a reaction product; the reaction product is filtered, dried and crushed to obtain the modified titanium dioxide.

[0064] The polyacid is a mixture of phthalic anhydride, terephthalic acid and adipic acid in a mass ratio of 1:0.2:1.5.

[0065] The fatty acid is eleostearic acid.

[0066] The ester compound is a mixture of hydroxyethyl acrylate, hydroxypropyl acrylate and hydroxyethyl methacrylate in a mass ratio of 0.4:1:1.3.

[0067] The weight percentage of hydroquinone in the ester compound is 0.4%.

[0068] The weight percentage of dibutyltin dilaurate in isophorone diisocyanate is 1%.

[0069] The preparation method of modified kaolin is as follows: by weight, 3 parts of silane coupling agent KH550 are added to 300 parts of ethanol, mixed evenly, and then 100 parts of kaolin and 1 part of calcium stearate are added, mixed at 73° C., and stirred for 10 minutes; the temperature is raised to 80° C., and then 7 parts of isopropyl distearoyloxyaluminate are added, stirred for 10 minutes, filtered to obtain a solid, and dried to obtain modified kaolin.

[0070] Performance Testing The UV curable resin compositions of Examples 1-3 and Comparative Examples 1-4 were used to prepare colored paints. The details are as follows: Raw materials for color paint: UV curable resin composition 170g; carbon black 30g; active diluent: propoxylated ditrimethylolpropane tetraacrylate 70g; thermoplastic acrylic resin: Tongde AC-1026M 60g; photoinitiator 2,2-dimethoxy-phenyl ketone 4g; alkyd resin drier: cobalt isooctanoate 0.4g; silicone dispersant: Corning Texaphor 3250 0.7g; silicone defoamer: DECHEM 68000 0.7g; polyether modified silicone leveling agent: EFKA 303 30.9g: Preparation method: Add 30% UV curable resin composition and carbon black at 1800r·min -1 After dispersion for 30 minutes, the mixture was ground with a sand mill until the particle size was less than 20 μm to obtain a color paste. The remaining UV curable resin composition, reactive diluent, thermoplastic acrylic resin, photoinitiator 2,2-dimethoxy-phenyl ketone, alkyd resin drier cobalt isooctanoate, silicone dispersant, silicone defoamer, polyester modified silicone leveling agent were added and the mixture was stirred at 1800 r·min. -1 Disperse for 35 minutes to obtain a colored paint.

[0071] 1. Adhesion: Use the hundred-grid method to test adhesion.

[0072] 2. RCA wear resistance: RCA paper tape 175g force tester; 3. Salt spray: salt spray tester, 5% NaCl, 35°C; 4. Boiling test: boiling at 100℃; Table 1 Paint properties

[0073] The results show that the UV-curable resin compositions of Examples 1-3 are used to prepare color paints, and have good performance in adhesion, abrasion resistance, salt spray resistance and water boiling test. Comparative Examples 1-4 show that changing the preparation conditions cannot achieve a balanced improvement in the four properties.

[0074] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a UV curable resin composition, characterized in that: The preparation method comprises the following steps: (1) Mix 30-40 parts of polyol, 20-30 parts of polyacid, 40-50 parts of fatty acid and 90-100 parts of xylene by weight, heat to 180-200° C., react until the acid value of the system reaches 10-12 mgKOH / g, and cool to 30-35° C. to obtain an alkyd resin; wherein the polyol is a mixture of propylene glycol, ethyl butyl propylene glycol and glycerol in a mass ratio of 1:1.3-1.5:0.2-0.6; (2) 30-40 parts by weight of an ester compound and 40-50 parts by weight of isophorone diisocyanate are mixed, and hydroquinone and dibutyltin dilaurate are added, and the mixture is reacted at 80-90° C. until the mass fraction of the hydroxyl group reaches 0.1-0.2%, and the temperature is lowered to 30-35° C. to obtain an acrylic modified polyurethane; (4) adding 200-240 parts by weight of alkyd resin, 30-40 parts by weight of modified titanium dioxide and 10-20 parts by weight of modified kaolin to acrylic modified polyurethane, reacting at 70-80° C. for 2-3 hours to obtain a UV curable resin; The preparation method of the modified titanium dioxide is as follows: 10-15 parts by mass of polyacrylate emulsion, 3-5 parts by mass of titanium dioxide and 100 parts by mass of water are mixed evenly, and ultrasonically dispersed at 30-34 kHz for 25-30 minutes to obtain a mixture; the mixture is stirred evenly and heated to 90°C-96°C, and kept warm for reaction for 2-3 hours to obtain a reaction product; the reaction product is filtered, dried and crushed to obtain the modified titanium dioxide.

2. The method for preparing a UV curable resin composition according to claim 1, characterized in that: The polyacid is selected from at least one of phthalic anhydride, terephthalic acid and adipic acid.

3. The method for preparing the UV curable resin composition according to claim 2, characterized in that: The polyacid is a mixture of phthalic anhydride, terephthalic acid and adipic acid in a mass ratio of 1:0.2-0.4:1.5-1.

9.

4. The method for preparing the UV curable resin composition according to claim 1, characterized in that: The fatty acid is at least one of eleostearic acid, oleic acid, linolenic acid and soy oil acid.

5. The method for preparing the UV curable resin composition according to claim 1, characterized in that: The ester compound is selected from at least one of hydroxyethyl acrylate, hydroxypropyl acrylate and hydroxyethyl methacrylate.

6. The method for preparing the UV curable resin composition according to claim 5, characterized in that: The ester compound is a mixture of hydroxyethyl acrylate, hydroxypropyl acrylate and hydroxyethyl methacrylate in a mass ratio of 0.4-0.8:1:1.3-1.

7.

7. The method for preparing a UV curable resin composition according to claim 1, characterized in that: The weight percentage of hydroquinone in the ester compound is 0.4%-0.9%.

8. The method for preparing a UV curable resin composition according to claim 1, characterized in that: The weight percentage of dibutyltin dilaurate in isophorone diisocyanate is 1%-2%.

9. The method for preparing a UV curable resin composition according to claim 1, characterized in that: The preparation method of modified kaolin is as follows: by weight, 3-5 parts of silane coupling agent KH550 are added to 300-400 parts of ethanol, mixed evenly, and then 100 parts of kaolin and 1-3 parts of calcium stearate are added, mixed at 73-76°C, and stirred for 10-15 minutes; the temperature is raised to 80-90°C, and then 7-9 parts of isopropyl distearoyloxyaluminate are added, stirred for 10-20 minutes, filtered to obtain a solid, and dried to obtain modified kaolin.

10. A UV curable resin composition obtained by the preparation method according to any one of claims 1 to 9.

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