A crack-resistant and high-adhesion UV-curing coating and its preparation method

Abstract

The invention discloses a kind of anti-cracking high-adhesion UV-curing coating, preparation raw materials include by weight: monomer combination 115 220 parts, copolyamine acrylic resin 15 20 parts, mixed high molecular polymer 0.5 5 parts, acrylic copolymer solution 0.5 5 parts, dispersant 0.5 5 parts, initiator 10 30 parts, modified acrylate 50 80 parts, solid filler 35 105 parts.Monomer combination of the present invention adopts less than 70 parts by weight, can obtain the UV-curing coating that viscosity and surface tension match, reach good construction and coating effect.Using the auxiliary agent of multiple acrylic resin polymer, the final coating effect of coating can be optimized, coating is applied in the base material of bamboo and wood material, can realize the wear resistance of coating, surface touch is smooth, coating can decompose the harmful substances in plate in coating process, and by ultraviolet light curing drying process, product is more healthy and environmentally friendly.

Description

Technical Field

[0001] The present invention relates to a crack-resistant and high-adhesion ultraviolet-curing coating and a preparation method thereof, and relates to C09D, in particular to the field of coating compositions. Background Art

[0002] As people pay more and more attention to environmental protection and health, the coatings used in furniture and other decoration industries for a long time are mostly PU or PE coatings, which have a high degree of pollution and affect the health of construction workers. The preparation of light-cured coatings is green and environmentally friendly, low-cost, and easy to operate mechanically. Existing coatings for protecting furniture are mostly surface paint products. Although they are cheap, the coating surface is not scratch-resistant and the wear resistance of the coating is poor. Especially for the surface coating of paint products, spraying them on the surface of wooden furniture will produce color difference, reduce the construction effect, and cause the color of the wooden furniture to be unnatural. Therefore, it is very important to develop a green and environmentally friendly light-curing coating with excellent construction effect.

[0003] Chinese invention patent CN201511007830.8 discloses a UV-curable protective coating and its preparation method. It uses a certain weight ratio of acrylate resin, acrylate monomer, citrate, photoinitiator, and demolding aid, and disperses and mixes them evenly. When used, the UV-curable protective coating of the present invention is applied to the surface of the object to be protected and cured by ultraviolet irradiation to form a protective film. The coating has a strong adhesion effect, but there is a certain color difference during use. Chinese invention patent CN201811573437.9 discloses a high-toughness epoxy powder coating. It uses bisphenol A epoxy resin and hyperbranched polyamide resin to work together to achieve high toughness and high adhesion. However, there is color difference after construction, and the use effect is not good. Summary of the Invention

[0004] In order to improve the crack resistance and high adhesion performance of UV-curing coatings, the first aspect of the present invention provides a UV-curing coating with crack resistance and high adhesion. The raw materials for preparation include, by weight: 45-70 parts of a monomer combination, 1-10 parts of a copolymerized amine acrylic resin, 0.1-2 parts of a mixed high molecular polymer, 0.1-4 parts of an acrylic copolymer solution, 0.1-2 parts of a dispersant, 5-20 parts of an initiator, 20-40 parts of a modified acrylate, and 10-20 parts of a solid filler.

[0005] As a preferred embodiment, the preparation raw materials include, by weight: 50-65 parts of monomer combination, 1-5 parts of copolymerized amine acrylic resin, 0.1-0.5 parts of mixed high molecular polymer, 0.1-0.5 parts of acrylic copolymer solution, 0.1-0.5 parts of dispersant, 5-10 parts of initiator, 20-30 parts of modified acrylate, and 11-16 parts of solid filler.

[0006] As a preferred embodiment, the raw materials for preparation include, by weight: 57 parts of monomer combination, 2 parts of copolymerized amine acrylic resin, 0.5 parts of mixed high molecular polymer, 0.5 parts of acrylic copolymer solution, 0.5 parts of dispersant, 6 parts of initiator, 26 parts of modified acrylate, and 11 parts of solid filler.

[0007] As a preferred embodiment, the modified acrylate is selected from one or a combination of epoxy acrylate, polyester acrylate, polyurethane acrylate, and silicone modified acrylate.

[0008] As a preferred embodiment, the monomer combination is selected from one or a combination of trimethylolpropane triacrylate, tripropylene glycol diacrylate, pentaerythritol triacrylate, 1,6-hexanediol diacrylate, and glycidyl methacrylate.

[0009] As a preferred embodiment, the monomer combination is a combination of trimethylolpropane triacrylate, tripropylene glycol diacrylate, pentaerythritol triacrylate, 1,6-hexanediol diacrylate, and glycidyl methacrylate; preferably, the weight ratio of the trimethylolpropane triacrylate, tripropylene glycol diacrylate, pentaerythritol triacrylate, 1,6-hexanediol diacrylate, and glycidyl methacrylate is (30-55): (10-35): (10-30): (5-15): (5-15).

[0010] As a preferred embodiment, the weight ratio of trimethylolpropane triacrylate, tripropylene glycol diacrylate, pentaerythritol triacrylate, 1,6-hexanediol diacrylate, and glycidyl methacrylate is (15-20): (10-15): (10-20): (8-10): (8-10).

[0011] As a preferred embodiment, the weight ratio of trimethylolpropane triacrylate, tripropylene glycol diacrylate, pentaerythritol triacrylate, 1,6-hexanediol diacrylate, and glycidyl methacrylate is 15:12:10:10:10.

[0012] As a preferred embodiment, the solid filler is selected from one or a combination of silicon dioxide, micronized wax, aluminum oxide, talc, and calcium carbonate.

[0013] As a preferred embodiment, the solid filler is a combination of silicon dioxide, micronized wax and aluminum oxide.

[0014] As a preferred embodiment, the weight ratio of the silicon dioxide, micropowder wax and aluminum oxide is (1-10): (1-10): (1-10).

[0015] As a preferred embodiment, the weight ratio of silicon dioxide, micropowder wax and aluminum oxide is (5-10): (1-5): (1-5).

[0016] As a preferred embodiment, the weight ratio of silicon dioxide, micropowder wax and aluminum oxide is 5:3:3.

[0017] As a preferred embodiment, the viscosity of the copolymerized amine acrylic resin at 25° C. is 1000-1500s.

[0018] As a preferred embodiment, the viscosity of the copolymerized amine acrylic resin at 25° C. is 1200 s.

[0019] As a preferred embodiment, the structure of the dispersant is a modified polyacrylate polymer, and the amine value of the modified polyacrylate polymer is 23-28 mgKOH / g.

[0020] As a preferred embodiment, the amine value of the modified polyacrylate polymer is 25 mgKOH / g.

[0021] As a preferred embodiment, the polyester acrylate is a hyperbranched polyester acrylate with a functionality of 6-8, and the viscosity of the polyester acrylate at 25° C. is 1200-2000 cps.

[0022] As a preferred embodiment, the polyester acrylate is a hyperbranched polyester acrylate with a functionality of 8, and the viscosity of the polyester acrylate at 25° C. is 1200-2000 cps.

[0023] As a preferred embodiment, the chromaticity of the polyester acrylate is ≤1, and the density of the polyester acrylate at 25°C is 1-1.2 g / cm 3 The acid value of the polyester acrylate is ≤2 mgKOH / g, and the refractive index is 1.4-1.5.

[0024] As a preferred embodiment, the chromaticity of the polyester acrylate is ≤1, and the density of the polyester acrylate at 25°C is 1.1 g / cm 3 The acid value of the polyester acrylate is ≤2 mgKOH / g, and the refractive index is 1.485.

[0025] As a preferred embodiment, the epoxy acrylate is a low-viscosity epoxy acrylate with a functionality of 2-6, and the viscosity of the epoxy acrylate is 800-1500 cps.

[0026] As a preferred embodiment, the epoxy acrylate is a low-viscosity epoxy acrylate with a functionality of 4, and the viscosity of the epoxy acrylate is 800-1500 cps.

[0027] As a preferred embodiment, the modified acrylate is a combination of epoxy acrylate and polyester acrylate.

[0028] As a preferred embodiment, the weight ratio of the epoxy acrylate to the polyester acrylate is (5-15):(10-30).

[0029] As a preferred embodiment, the weight ratio of the epoxy acrylate to the polyester acrylate is (5-10): (15-20).

[0030] As a preferred embodiment, the weight ratio of the epoxy acrylate to the polyester acrylate is 8:18.

[0031] As a preferred embodiment, the initiator is a photoinitiator, and the photoinitiator includes a combination of ITX and 1173. Preferably, the weight ratio of ITX to 1173 is (1-5): (2-5).

[0032] As a preferred embodiment, the weight ratio of ITX to 1173 is (1-2): (4-5).

[0033] As a preferred embodiment, the weight ratio of ITX to 1173 is 2:4.

[0034] As a preferred embodiment, the aluminum oxide is vapor-phase nano-aluminum oxide, and the particle size of the aluminum oxide is 30-50 nm.

[0035] During experiments, the applicant discovered that by using a monomer combination of trimethylolpropane triacrylate, tripropylene glycol diacrylate, pentaerythritol triacrylate, 1,6-hexanediol diacrylate, and glycidyl methacrylate, and controlling the monomer content to less than 70%, a UV-curable coating with a well-matched viscosity and surface tension can be obtained, achieving excellent application and coating results. The hypothesis is that the combination of trimethylolpropane triacrylate, tripropylene glycol diacrylate, pentaerythritol triacrylate, 1,6-hexanediol diacrylate, and glycidyl methacrylate achieves a precise match between viscosity and surface tension, allowing the cured coating to adhere easily to the substrate surface and achieve a good gloss. The applicant further discovered that if the monomer content exceeds 70%, the coating will experience sedimentation, resulting in inconsistent color and easy delamination after application.

[0036] The applicant further discovered that by introducing a combination of silica, micronized wax and alumina, the gloss and scratch resistance of the coating can be further improved. The reason may be that the combination of silica, micronized wax and alumina can increase the hardness of the coating and increase the wear resistance of the coating. In addition, the applicant unexpectedly discovered that the surface of the coating formed is smooth to the touch and can achieve good iodine stain resistance.

[0037] A second aspect of the present invention provides a method for preparing a crack-resistant, high-adhesion UV-curable coating, comprising the following steps:

[0038] S1: Combine monomers, copolymerize amine acrylic resin, mix high molecular weight polymer, acrylic copolymer solution, and dispersant in a high-speed disperser and stir for 10-60 minutes at a speed of 1000-2000 r / min;

[0039] S2 adds initiator and stirs for 30-100 min at a speed of 1000-2000 r / min;

[0040] Add modified acrylate to S3 and stir for 10-60 minutes at a speed of 1000-2000 r / min;

[0041] Add solid filler to S4 and stir for 30-60 minutes at a speed of 1000-3000 r / min to obtain the product.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] (1) The crack-resistant and high-adhesion UV-curing coating of the present invention uses a monomer combination of less than 70 parts by weight, which can obtain a UV-curing coating with matched viscosity and surface tension, achieving good construction and coating effects.

[0044] (2) The crack-resistant and high-adhesion UV-curing coating of the present invention uses a variety of acrylic resin polymer additives to optimize the final coating effect of the coating. The coating is mechanized, overcoming the human factors in manual operation, and the product has small color difference and stable quality.

[0045] (3) The crack-resistant and high-adhesion UV-curing coating of the present invention can further improve the gloss and scratch resistance of the coating by introducing a combination of silica, micro-powder wax and aluminum oxide, and is environmentally friendly and construction-friendly.

[0046] (4) The crack-resistant and high-adhesion UV-curing coating of the present invention can be applied to a substrate made of bamboo or wood to achieve wear resistance of the coating and a smooth surface touch. During the coating process, the coating can decompose harmful substances in the board and is cured and dried by ultraviolet light, making the product healthier and more environmentally friendly.

[0047] (5) The crack-resistant and high-adhesion UV-curing coating of the present invention is a truly green and environmentally friendly paint that does not contain volatile substances. The products produced on the UV coating production line are green, healthy and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 The actual effect picture of the product after being painted with the paint of the market competitor;

[0049] Figure 2 This is a photo of the actual effect of the paint after application of Example 3 of the present invention;

[0050] Figure 3 A diagram showing the friction effect of a competitor's paint after application;

[0051] Figure 4 This is a diagram showing the friction effect of the paint of Example 3 of the present invention after brushing. DETAILED DESCRIPTION

[0052] Example

[0053] A crack-resistant and high-adhesion UV-curing coating, the raw materials for its preparation are shown in Table 1 below in parts by weight:

[0054] Table 1

[0055]

[0056]

[0057] The copolymerized amine acrylic resin is EBECRYL 7100 from Allnex; the mixed polymer is TEGODispers 685; the acrylic copolymer solution is BYK ANTI-TERRA-210; and the chemical structure of the dispersant is a modified polyacrylate polymer with an amine value of 25 mgKOH / g, purchased from BASF DispexUltra PA4560.

[0058] The epoxy acrylate is a low-viscosity epoxy acrylate with a functionality of 4 and a viscosity of 800-1500 cps, purchased from Lancolu L-6113.

[0059] The polyester acrylate is a hyperbranched polyester acrylate with a functionality of 8, the viscosity of the polyester acrylate at 25° C. is 1200-2000 cps, the chromaticity of the polyester acrylate is ≤1, and the density of the polyester acrylate at 25° C. is 1.1 g / cm 3 The polyester acrylate has an acid value of ≤2 mgKOH / g and a refractive index of 1.485 and is purchased from Lan Kelu L-6127.

[0060] The silicon dioxide was from Sigma-Aldrich, the micro-powder wax was from Tianshi Twax-1045, and the alumina was fumed nano-alumina with a particle size of 30-50 nm, purchased from Yingcheng YC-QL30.

[0061] A method for preparing a crack-resistant and high-adhesion UV-curing coating comprises the following steps:

[0062] S1: Combine monomers, copolymerize amine acrylic resin, mix high molecular weight polymer, acrylic copolymer solution, and dispersant in a high-speed disperser and stir at a speed of 1500 r / min for 30 min;

[0063] S2 added initiator and stirred for 65 min at a speed of 1500 r / min;

[0064] Add modified acrylate to S3 and stir for 30 min at a speed of 1500 r / min;

[0065] Add solid filler to S4 and stir for 45 minutes at a speed of 2000 r / min to obtain the product.

[0066] Performance Testing

[0067] 1. Viscosity test: Use a rotational viscometer to test the viscosity at 25°C. Test each sample 3 times and take the average value.

[0068] 2. Density test: Use a density cup to test the gel time at 25°C. Test each sample 3 times and take the average value.

[0069] 3. Surface Tension Test: Use a liquid surface tension meter to measure the surface tension of the coating at room temperature. Test each sample three times and take the average value. When testing surface tension, use an infrared thermometer to record the actual temperature during the test.

[0070] 4. Fineness test: Use a fineness test plate to test the fineness at room temperature. Test each sample three times and take the average value.

[0071] 5. Prepare, cure and test the coating:

[0072] 5.1.1 Preparation of coating: Preheat the coating and bamboo-wood composite substrate to 45°C, and evenly cover the coating on the substrate using a coating film applicator (10-100 μm), ensuring that the coating temperature is around 40°C;

[0073] 5.1.2 Curing coating: Place the coating sample under a UV lamp (500-1500mJ / cm 2 ) and allowed to stand for 30 minutes, and then the performance of the relevant cured coating was tested. Figure 1-2 .

[0074] 5.2 Paint hiding power test: Use a colorimeter to measure the color difference before and after coating. For each sample, test ten points and take the average value.

[0075] 5.3 Coating gloss test: Use a gloss meter to test the gloss of the cured coating. For each sample, test ten points and take the average value.

[0076] 5.4 Paint stain resistance test: Using a colorimeter, apply iodine tincture for 1 minute, then wipe it off. Compare the increase in the b value before and after. Test each sample three times and take the average value.

[0077] 5.5 Friction test: Use double-sided tape to stick the cut 200-grit sandpaper to the bottom of the friction weight, and push and pull it back and forth horizontally on one side of the ruler five times.

[0078] The test results are shown in Table 2.

[0079] Table 2

[0080]

Claims

1. A crack-resistant and high-adhesion UV-curing coating, characterized in that: The raw materials for preparation include, by weight: 45-70 parts of monomer combination, 1-10 parts of copolymerized amine acrylic resin, 0.1-2 parts of mixed high molecular polymer, 0.1-4 parts of acrylic copolymer solution, 0.1-2 parts of dispersant, 5-20 parts of initiator, 20-40 parts of modified acrylate, and 10-20 parts of solid filler; The monomer combination is a combination of trimethylolpropane triacrylate, tripropylene glycol diacrylate, pentaerythritol triacrylate, 1,6-hexanediol diacrylate, and glycidyl methacrylate, with a weight ratio of (15-20): (10-15): (10-20): (8-10): (8-10); The viscosity of the copolymerized amine acrylic resin at 25° C. is 1000-1500s; The solid filler is a combination of silicon dioxide, micronized wax and alumina; the alumina is fumed nano-alumina, and the particle size of the alumina is 30-50 nm; The structure of the dispersant is a modified polyacrylate polymer, and the amine value of the modified polyacrylate polymer is 23-28 mgKOH / g; The modified acrylate is a combination of epoxy acrylate and polyester acrylate in a weight ratio of (5-15): (10-30); The polyester acrylate is a hyperbranched polyester acrylate having a functionality of 6-8, and the viscosity of the polyester acrylate at 25° C. is 1200-2000 cps; The epoxy acrylate is a low-viscosity epoxy acrylate with a functionality of 2-6, and the viscosity of the epoxy acrylate is 800-1500 cps.

2. A method for preparing the crack-resistant and high-adhesion UV-curing coating according to claim 1, characterized in that: The following steps are involved: S1: Combine monomers, copolymerize amine acrylic resin, mix high molecular weight polymer, acrylic copolymer solution, and dispersant in a high-speed disperser and stir for 10-60 minutes at a speed of 1000-2000 r / min; S2 adds initiator and stirs for 30-100 min at a speed of 1000-2000 r / min; Add modified acrylate to S3 and stir for 10-60 minutes at a speed of 1000-2000 r / min; Add solid filler to S4 and stir for 30-60 minutes at a speed of 1000-3000 r / min to obtain the product.

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