Weather-resistant waterproof photocureable coating and preparation method thereof

Abstract

The invention provides the field of photocureable coatings, and particularly discloses a weather-resistant waterproof photocureable coating and a preparation method thereof.The weather-resistant waterproof photocureable coating is prepared from mixed resin, a photoinitiator, mixed filler, a super-hydrophobic auxiliary, a bio-based defoaming agent, a modified polymer thickener and a plant-based solvent; the preparation method comprises the following steps: weighing the mixed resin, the photoinitiator, the mixed filler, the super-hydrophobic additive, the bio-based defoaming agent, the modified polymer thickener and the plant-based solvent in parts by weight for later use; uniformly mixing the mixed resin and the mixed filler mixed solution, and filtering; the photoinitiator, the super-hydrophobic auxiliary agent, the bio-based defoaming agent, the modified polymer thickening agent and the plant-based solvent are sequentially added into the premix, mixing and stirring are conducted again, filtering is conducted, and the required weather-proof and waterproof photocureable coating is obtained and is high in water resistance and weather resistance.

Description

Technical Field

[0001] The present application relates to the field of photocurable coatings, and in particular to a weather-resistant and waterproof photocurable coating and a preparation method thereof. Background Art

[0002] Photocurable coatings, also known as photosensitive coatings, use ultraviolet light as the energy source for coating curing, and are also known as UV-curable coatings. After coating, they can quickly cure into films on materials such as paper, plastic, leather and wood without heating.

[0003] After long-term use, the photocurable coating is easily affected by temperature and water, and will age, turn yellow, and fall off, which will affect the service life of the coating. Based on the above statement, the present application provides a weather-resistant and waterproof photocurable coating and a preparation method thereof. Summary of the invention

[0004] The purpose of the present application is to improve the waterproofness and weather resistance of the photocurable coating, and to provide a weather-resistant and waterproof photocurable coating and a preparation method thereof compared to the prior art.

[0005] In a first aspect, the present application provides a weather-resistant and waterproof photocurable coating, comprising the following raw materials in parts by weight: 75-80 parts of mixed resin, 1-4 parts of photoinitiator, 5-10 parts of mixed filler, 0.2-1.5 parts of superhydrophobic additive, 0.1-0.8 parts of bio-based defoamer, 0.3-1.5 parts of modified polymer thickener, and 1-2 parts of plant-based solvent;

[0006] The mixed resin is prepared by the following method:

[0007] Acrylic resin, plant-based light-curing resin, polyurethane resin and epoxy resin are uniformly mixed in a mass ratio of 50-60:20-30:10-17:3, and then vacuum stirred at a stirring speed of 800-1500r / min. After the mixed resin is formed, it is stored for use at a storage temperature of 15-25°C.

[0008] By adopting the above-mentioned technical scheme, this application selects mixed resin as the main coating material, and adopts a mixing scheme of acrylic resin, plant-based photocurable resin, polyurethane resin and epoxy resin, which can ensure the compatibility between resins to avoid stratification or performance degradation, and increase chemical resistance and mechanical strength while maintaining good flexibility. It has good environmental performance and is suitable for coating applications with high environmental requirements.

[0009] Preferably, the mixed filler comprises flax fiber and talcum powder in a mass ratio of 9-16:3.

[0010] Preferably, the flax fiber is prepared by the following method:

[0011] a. The collected flax plants are defoliated and impurities removed, leaving the stems, washed, dried, chopped, and then mechanically ground through a 20-60 mesh sieve to obtain a fine powder;

[0012] b. Control the material-liquid ratio to 1:4-7, soak the ground fine powder in 0.2-0.4 mol / L sodium hydroxide solution for 4-6 hours, filter, wash and dry to obtain alkaline hydrolyzed flax fiber;

[0013] c. Put the alkaline hydrolyzed flax fiber into 0.7-1 mol / L sodium chloride for bleaching for 5-10 hours to obtain transparent flax fiber;

[0014] d. Mix the flax fiber, linseed oil and silane coupling agent solution and perform ultrasonic treatment. After the treatment, dry the mixture to obtain the desired flax fiber.

[0015] Preferably, the mass ratio of the flax fiber, the linseed oil and the silane coupling agent solution is 1:0.1-0.15:0.2-0.25.

[0016] Preferably, the ultrasonic temperature is 70-82°C, the ultrasonic power is 60-65W, and the ultrasonic time is 35-45min.

[0017] Preferably, the photoinitiator is an isocyanate photoinitiator, the plant-based solvent is soybean oil, the super-hydrophobic additive is a fluorinated polymer, and the modified polymer thickener is a polyvinyl alcohol thickener.

[0018] By adding mixed fillers, using flax fiber and talcum powder as fillers, the flax fiber has good strength and toughness, which can increase the mechanical properties and weather resistance of the resin, and the talcum powder can increase the heat resistance and waterproof properties of the resin, which can further improve the waterproof and weather resistance of the photocuring coating.

[0019] In a second aspect, the present application provides a method for preparing a weather-resistant and waterproof photocurable coating, comprising the following preparation steps:

[0020] S1. Weigh the mixed resin, photoinitiator, mixed filler, super-hydrophobic additive, bio-based defoamer, modified polymer thickener and plant-based solvent by weight for later use;

[0021] S2, after the mixed resin and the mixed filler mixture are evenly mixed, the mixture is filtered to remove undissolved particles or bubbles to obtain a premix;

[0022] S3. Add the photoinitiator, super hydrophobic additive, bio-based defoamer, modified polymer thickener and plant-based solvent to the premix in sequence, mix and stir again, and filter to obtain the desired weather-resistant and waterproof photocurable coating.

[0023] Compared with the prior art, the advantages of the present application are: the present application adopts the above-mentioned technical scheme, the present application selects a mixed resin as the main coating material, and adopts a mixed scheme of acrylic resin, plant-based photocurable resin, polyurethane resin and epoxy resin, which can ensure the compatibility between resins to avoid stratification or performance degradation, and increases chemical resistance and mechanical strength while maintaining good flexibility, has good environmental performance, and is suitable for coating applications with high environmental requirements. By adding mixed fillers, flax fiber and talcum powder are used as fillers, wherein flax fiber has good strength and toughness, which can increase the mechanical properties and weather resistance of the resin, and talcum powder can increase the heat resistance and waterproof performance of the resin, which can further improve the waterproof and weather resistance of the photocurable coating. DETAILED DESCRIPTION

[0024] The present application is further described in detail below with reference to the embodiments.

[0025] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of this application.

[0026] Embodiment 1:

[0027] A weather-resistant and waterproof photocurable coating, comprising the following raw materials in parts by weight: 75 parts of mixed resin, 1 part of photoinitiator, 5 parts of mixed filler, 0.2 parts of super-hydrophobic additive, 0.1 parts of bio-based defoamer, 0.3 parts of modified polymer thickener, and 1 part of plant-based solvent;

[0028] It should be noted that the photoinitiator is an isocyanate photoinitiator, the plant-based solvent is soybean oil, the super-hydrophobic additive is a fluorinated polymer, and the modified polymer thickener is a polyvinyl alcohol thickener.

[0029] The mixed resin is prepared by the following method:

[0030] Acrylic resin, plant-based light-curing resin, polyurethane resin and epoxy resin are evenly mixed in a mass ratio of 50:20:10:3, and then vacuum stirred at a speed of 800 r / min. After the mixed resin is formed, it is stored for later use at a storage temperature of 15°C.

[0031] The mixed filler includes flax fiber and talcum powder in a mass ratio of 9:3.

[0032] Further, the flax fiber is prepared by the following method:

[0033] a. The collected flax plants are defoliated and impurities removed, leaving the stems, washed, dried, chopped, and then mechanically ground through a 20-mesh sieve to obtain fine powder;

[0034] b. Control the material-liquid ratio to 1:4, soak the ground fine powder in 0.2 mol / L sodium hydroxide solution for 4 hours, filter, wash and dry to obtain alkaline hydrolyzed flax fiber;

[0035] c. Put the alkaline hydrolyzed flax fiber into 0.7 mol / L sodium chloride for bleaching for 5 hours to obtain transparent flax fiber;

[0036] d. Mix the flax fiber, linseed oil and silane coupling agent solution and perform ultrasonic treatment. After the treatment, dry the mixture to obtain the desired flax fiber.

[0037] The mass ratio of flax fiber, linseed oil and silane coupling agent solution is 1:0.1:0.2, the ultrasonic temperature is 70°C, the ultrasonic power is 60W, and the ultrasonic time is 35min.

[0038] A method for preparing a weather-resistant and waterproof photocurable coating comprises the following preparation steps:

[0039] S1. Weigh the mixed resin, photoinitiator, mixed filler, super-hydrophobic additive, bio-based defoamer, modified polymer thickener and plant-based solvent by weight for later use;

[0040] S2, after the mixed resin and the mixed filler mixture are evenly mixed, the mixture is filtered to remove undissolved particles or bubbles to obtain a premix;

[0041] S3. Add the photoinitiator, super hydrophobic additive, bio-based defoamer, modified polymer thickener and plant-based solvent to the premix in sequence, mix and stir again, and filter to obtain the desired weather-resistant and waterproof photocurable coating.

[0042] Embodiment 2:

[0043] A weather-resistant and waterproof photocurable coating, comprising the following raw materials in parts by weight: 80 parts of mixed resin, 4 parts of photoinitiator, 10 parts of mixed filler, 1.5 parts of super-hydrophobic additive, 0.8 parts of bio-based defoamer, 1.5 parts of modified polymer thickener, and 2 parts of plant-based solvent;

[0044] It should be noted that the photoinitiator is an isocyanate photoinitiator, the plant-based solvent is soybean oil, the super-hydrophobic additive is a fluorinated polymer, and the modified polymer thickener is a polyvinyl alcohol thickener.

[0045] The mixed resin is prepared by the following method:

[0046] Acrylic resin, plant-based photocurable resin, polyurethane resin and epoxy resin are evenly mixed in a mass ratio of 60:30:17:3, and then vacuum stirred at a stirring speed of 1500r / min. After the mixed resin is formed, it is stored for later use at a storage temperature of 25°C.

[0047] The mixed filler includes flax fiber and talcum powder in a mass ratio of 16:3.

[0048] Further, the flax fiber is prepared by the following method:

[0049] a. The flax plants were collected and the leaves and impurities were removed, leaving the stems, washed, dried, chopped, and then mechanically ground through a 60-mesh sieve to obtain fine powder;

[0050] b. Control the material-liquid ratio to 1:7, soak the ground fine powder in 0.4 mol / L sodium hydroxide solution for 4-6 hours, filter, wash and dry to obtain alkaline hydrolyzed flax fiber;

[0051] c. Put the alkaline hydrolyzed flax fiber into 1 mol / L sodium chloride for bleaching for 5-10 hours to obtain transparent flax fiber;

[0052] d. Mix the flax fiber, linseed oil and silane coupling agent solution and perform ultrasonic treatment. After the treatment, dry the mixture to obtain the desired flax fiber.

[0053] The mass ratio of flax fiber, linseed oil and silane coupling agent solution is 1:0.15:0.25, the ultrasonic temperature is 82°C, the ultrasonic power is 65W, and the ultrasonic time is 45min.

[0054] A method for preparing a weather-resistant and waterproof photocurable coating comprises the following preparation steps:

[0055] S1. Weigh the mixed resin, photoinitiator, mixed filler, super-hydrophobic additive, bio-based defoamer, modified polymer thickener and plant-based solvent by weight for later use;

[0056] S2, after the mixed resin and the mixed filler mixture are evenly mixed, the mixture is filtered to remove undissolved particles or bubbles to obtain a premix;

[0057] S3. Add the photoinitiator, super hydrophobic additive, bio-based defoamer, modified polymer thickener and plant-based solvent to the premix in sequence, mix and stir again, and filter to obtain the desired weather-resistant and waterproof photocurable coating.

[0058] Embodiment 3:

[0059] A weather-resistant and waterproof photocurable coating, comprising the following raw materials in parts by weight: 79 parts of mixed resin, 3 parts of photoinitiator, 6 parts of mixed filler, 1 part of super-hydrophobic additive, 0.5 parts of bio-based defoamer, 1 part of modified polymer thickener, and 1.5 parts of plant-based solvent;

[0060] It should be noted that the photoinitiator is an isocyanate photoinitiator, the plant-based solvent is soybean oil, the super-hydrophobic additive is a fluorinated polymer, and the modified polymer thickener is a polyvinyl alcohol thickener.

[0061] The mixed resin is prepared by the following method:

[0062] Acrylic resin, plant-based photocurable resin, polyurethane resin and epoxy resin are evenly mixed in a mass ratio of 55:25:15:3, and then vacuum stirred at a stirring speed of 1200r / min. After the mixed resin is formed, it is stored for later use at a storage temperature of 20°C.

[0063] The mixed filler includes flax fiber and talcum powder in a mass ratio of 12:3.

[0064] Further, the flax fiber is prepared by the following method:

[0065] a. The flax plants were collected and the leaves and impurities were removed, leaving the stems, which were washed, dried, chopped, and then mechanically ground through a 40-mesh sieve to obtain fine powder;

[0066] b. Control the material-liquid ratio to 1:6, soak the ground fine powder in 0.3 mol / L sodium hydroxide solution for 5 hours, filter, wash and dry to obtain alkaline hydrolyzed flax fiber;

[0067] c. Put the alkaline hydrolyzed flax fiber into 0.9 mol / L sodium chloride for bleaching for 8 hours to obtain transparent flax fiber;

[0068] d. Mix the flax fiber, linseed oil and silane coupling agent solution and perform ultrasonic treatment. After the treatment, dry the mixture to obtain the desired flax fiber.

[0069] The mass ratio of flax fiber, linseed oil and silane coupling agent solution is 1:0.1:0.23, the ultrasonic temperature is 75°C, the ultrasonic power is 62W, and the ultrasonic time is 40min.

[0070] A method for preparing a weather-resistant and waterproof photocurable coating comprises the following preparation steps:

[0071] S1. Weigh the mixed resin, photoinitiator, mixed filler, super-hydrophobic additive, bio-based defoamer, modified polymer thickener and plant-based solvent by weight for later use;

[0072] S2, after the mixed resin and the mixed filler mixture are evenly mixed, the mixture is filtered to remove undissolved particles or bubbles to obtain a premix;

[0073] S3. Add the photoinitiator, super hydrophobic additive, bio-based defoamer, modified polymer thickener and plant-based solvent to the premix in sequence, mix and stir again, and filter to obtain the desired weather-resistant and waterproof photocurable coating.

[0074] In order to verify the comprehensive performance of the weather-resistant and waterproof photocurable coatings prepared in Examples 1-3 of the present application, the applicant set up Comparative Examples 1-2, which are as follows:

[0075] Comparative Example 1:

[0076] A weather-resistant and waterproof photocurable coating, comprising the following raw materials in parts by weight: 75 parts of mixed resin, 1 part of photoinitiator, 5 parts of mixed filler, 0.2 parts of super-hydrophobic additive, 0.1 parts of bio-based defoamer, 0.3 parts of modified polymer thickener, and 1 part of plant-based solvent;

[0077] It should be noted that the photoinitiator is an isocyanate photoinitiator, the plant-based solvent is soybean oil, the super-hydrophobic additive is a fluorinated polymer, and the modified polymer thickener is a polyvinyl alcohol thickener.

[0078] The mixed resin is acrylic resin.

[0079] The mixed filler includes flax fiber and talcum powder in a mass ratio of 9:3.

[0080] Further, the flax fiber is prepared by the following method:

[0081] a. The collected flax plants are defoliated and impurities removed, leaving the stems, washed, dried, chopped, and then mechanically ground through a 20-mesh sieve to obtain fine powder;

[0082] b. Control the material-liquid ratio to 1:4, soak the ground fine powder in 0.2 mol / L sodium hydroxide solution for 4 hours, filter, wash and dry to obtain alkaline hydrolyzed flax fiber;

[0083] c. Put the alkaline hydrolyzed flax fiber into 0.7 mol / L sodium chloride for bleaching for 5 hours to obtain transparent flax fiber;

[0084] d. Mix the flax fiber, linseed oil and silane coupling agent solution and perform ultrasonic treatment. After the treatment, dry the mixture to obtain the desired flax fiber.

[0085] The mass ratio of flax fiber, linseed oil and silane coupling agent solution is 1:0.1:0.2, the ultrasonic temperature is 70°C, the ultrasonic power is 60W, and the ultrasonic time is 35min.

[0086] A method for preparing a weather-resistant and waterproof photocurable coating comprises the following preparation steps:

[0087] S1. Weigh the mixed resin, photoinitiator, mixed filler, super-hydrophobic additive, bio-based defoamer, modified polymer thickener and plant-based solvent by weight for later use;

[0088] S2, after the mixed resin and the mixed filler mixture are evenly mixed, the mixture is filtered to remove undissolved particles or bubbles to obtain a premix;

[0089] S3. Add the photoinitiator, super hydrophobic additive, bio-based defoamer, modified polymer thickener and plant-based solvent to the premix in sequence, mix and stir again, and filter to obtain the desired weather-resistant and waterproof photocurable coating.

[0090] Comparative Example 2:

[0091] A weather-resistant and waterproof photocurable coating, comprising the following raw materials in parts by weight: 75 parts of mixed resin, 1 part of photoinitiator, 5 parts of mixed filler, 0.2 parts of super-hydrophobic additive, 0.1 parts of bio-based defoamer, 0.3 parts of modified polymer thickener, and 1 part of plant-based solvent;

[0092] It should be noted that the photoinitiator is an isocyanate photoinitiator, the plant-based solvent is soybean oil, the super-hydrophobic additive is a fluorinated polymer, and the modified polymer thickener is a polyvinyl alcohol thickener.

[0093] The mixed resin is prepared by the following method:

[0094] Acrylic resin, plant-based light-curing resin, polyurethane resin and epoxy resin are evenly mixed in a mass ratio of 50:20:10:3, and then vacuum stirred at a speed of 800 r / min. After the mixed resin is formed, it is stored for later use at a storage temperature of 15°C.

[0095] Wherein, the mixed filler is talcum powder.

[0096] A method for preparing a weather-resistant and waterproof photocurable coating comprises the following preparation steps:

[0097] S1. Weigh the mixed resin, photoinitiator, mixed filler, super-hydrophobic additive, bio-based defoamer, modified polymer thickener and plant-based solvent by weight for later use;

[0098] S2, after the mixed resin and the mixed filler mixture are evenly mixed, the mixture is filtered to remove undissolved particles or bubbles to obtain a premix;

[0099] S3. Add the photoinitiator, super hydrophobic additive, bio-based defoamer, modified polymer thickener and plant-based solvent to the premix in sequence, mix and stir again, and filter to obtain the desired weather-resistant and waterproof photocurable coating.

[0100] Performance testing:

[0101] According to the test standards, the weather-resistant and waterproof photocurable coatings prepared in Examples 1-3 of the present application and Comparative Examples 1-2 were respectively coated on the surface of the substrate to prepare test specimens, and the test specimens were placed in a test room at a temperature of 25°C and a relative humidity of 55% for 2 hours, and then the performance of the specimens was tested respectively.

[0102] According to GBT 16777-2008 "Test Methods for Building Waterproof Coatings", after the test specimens are coated, the stability of the coating after contact with water is evaluated, and the coating shedding area ratio after the test specimens is detected. The coating range of the specimens is 40cmx40cm and the coating thickness is 50nm.

[0103] According to GB / T 23983-2009 "Determination of Yellowing Resistance of Wood Coatings", the test piece is placed at a temperature of 69-80℃ and an irradiance of 0.68W / m, and exposed to continuous light for 50h or longer. The hardness and discoloration rate of the test piece after the test are tested. The test piece specification is 40cmx40cm, and the coating thickness is 50nm.

[0104] The test results are shown in Table 1 below:

[0105]

[0106]

[0107] It can be seen from the data shown in Table 1 above that the weather-resistant and waterproof photocurable coatings prepared in Examples 1-3 of the present application have high waterproofness and weather resistance and excellent comprehensive performance.

[0108] It can be seen from the data shown in Example 1 and Comparative Example 1 that Example 1 of the present application can further improve the waterproofness and weather resistance of the photocurable coating by pre-preparing acrylic resin, plant-based photocurable resin, polyurethane resin and epoxy resin as a mixed resin.

[0109] It can be seen from the data shown in Example 1 and Comparative Example 2 that Example 1 of the present application can significantly improve the waterproofness and weather resistance of the photocurable coating by pre-preparing flax fiber and talcum powder as mixed fillers, compared with Comparative Example 1 without adding mixed fillers.

[0110] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A weather-resistant and waterproof photocurable coating, characterized in that: The invention comprises the following raw materials in parts by weight: 75-80 parts of mixed resin, 1-4 parts of photoinitiator, 5-10 parts of mixed filler, 0.2-1.5 parts of super hydrophobic additive, 0.1-0.8 parts of bio-based defoamer, 0.3-1.5 parts of modified polymer thickener, and 1-2 parts of plant-based solvent; The mixed resin is prepared by the following method: Acrylic resin, plant-based light-curing resin, polyurethane resin and epoxy resin are uniformly mixed in a mass ratio of 50-60:20-30:10-17:3, and then vacuum stirred at a stirring speed of 800-1500r / min. After the mixed resin is formed, it is stored for use at a storage temperature of 15-25°C.

2. A weather-resistant and waterproof light-curing coating according to claim 1, characterized in that: The mixed filler comprises flax fiber and talc in a ratio of 9-16:

3.

3. A weather-resistant and waterproof light-curing coating according to claim 2, characterized in that: The flax fiber is prepared by the following method: a. The collected flax plants are defoliated and impurities removed, leaving the stems, washed, dried, chopped, and then mechanically ground through a 20-60 mesh sieve to obtain a fine powder; b. Control the material-liquid ratio to 1:4-7, soak the ground fine powder in 0.2-0.4 mol / L sodium hydroxide solution for 4-6 hours, filter, wash and dry to obtain alkaline hydrolyzed flax fiber; c. Put the alkaline hydrolyzed flax fiber into 0.7-1 mol / L sodium chloride for bleaching for 5-10 hours to obtain transparent flax fiber; d. Mix the flax fiber, linseed oil and silane coupling agent solution and perform ultrasonic treatment. After the treatment, dry the mixture to obtain the desired flax fiber.

4. A weather-resistant and waterproof light-curing coating according to claim 3, characterized in that: The mass ratio of the flax fiber, the linseed oil and the silane coupling agent solution is 1:0.1-0.15:0.2-0.

25.

5. The weather-resistant and waterproof photocurable coating according to claim 3, characterized in that: The ultrasonic temperature is 70-82°C, the ultrasonic power is 60-65W, and the ultrasonic time is 35-45min.

6. The weather-resistant and waterproof photocurable coating according to claim 3, characterized in that: The photoinitiator is an isocyanate photoinitiator, the plant-based solvent is soybean oil, the super-hydrophobic auxiliary agent is a fluorinated polymer, and the modified polymer thickener is a polyvinyl alcohol thickener.

7. A method for preparing a weather-resistant and waterproof photocurable coating according to any one of claims 1 to 6, characterized in that: The method comprises the following preparation steps: S1. Weigh the mixed resin, photoinitiator, mixed filler, super-hydrophobic additive, bio-based defoamer, modified polymer thickener and plant-based solvent by weight for later use; S2, after the mixed resin and the mixed filler mixture are evenly mixed, the mixture is filtered to remove undissolved particles or bubbles to obtain a premix; S3. Add the photoinitiator, super hydrophobic additive, bio-based defoamer, modified polymer thickener and plant-based solvent to the premix in sequence, mix and stir again, and filter to obtain the desired weather-resistant and waterproof photocurable coating.

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