High adhesion water-based polyester gloss paint and preparation method thereof

Abstract

The present application relates to the technical field of water-based gloss oil, and specifically discloses a high-adhesion water-based polyester gloss oil coating and a preparation method thereof. The high-adhesion water-based polyester gloss oil coating comprises polyurethane resin, polyester resin, defoaming agent, leveling agent, surfactant and wetting dispersant, the weight ratio of the polyurethane resin and the polyester resin is 30-45:12-20, and the solvent comprises ethylene glycol butyl ether and / or ethylene glycol ether. The main agent in the high-adhesion water-based polyester gloss oil coating of the present application can form a film structure with stable structure and good compactness through cross-linking reaction under the action of the auxiliary agent, and the coating has higher adhesion, wear resistance, yellowing resistance and gloss after coating, and is more suitable for industrial expansion production.

Description

Technical Field

[0001] This invention belongs to the field of water-based varnish technology, specifically relating to a high-adhesion water-based polyester varnish coating and its preparation method. Background Technology

[0002] Varnish is a synthetic resin, usually referring to a transparent surface varnish, prepared from a base material and additives. It is further subdivided into various types, including gloss varnish, matte varnish, and pearlescent varnish. Varnish possesses good hardness, abrasion resistance, and gloss. When applied to product surfaces, it provides effective protection, a pleasant feel, and an attractive appearance, and can be used on containers, fabrics, and bamboo / wood products.

[0003] Existing technologies have yielded numerous studies on the preparation of varnishes. For example, Chinese patent CN115746680A discloses a silicone-free varnish coating and its preparation method. The raw materials for this silicone-free varnish coating include: polyester resin, amino resin, wax powder, blocked dodecylbenzene sulfonic acid, fluorocarbon liquid wetting and leveling agent, nonionic surfactant, sodium lauroyl glutamate, solvent, and defoamer. The varnish coating prepared by this method exhibits strong adhesion, high hardness, and scratch resistance after application. Furthermore, its silicone-free nature makes it safer and more environmentally friendly. However, compared to other leveling agents, the fluorocarbon liquid wetting and leveling agent used in this coating is more expensive, and the varnish coating has poor resistance to yellowing, failing to meet production requirements. For example, Chinese patent CN113174162A discloses a scratch-resistant and solvent-resistant single-component matte protective varnish. By weight percentage, it consists of the following components: 20-30% polyester resin, 0.5-2% matting powder, 1-5% polystyrene thermally expandable microspheres, 1-5% filler, 50-68% mixed solvent, 0.5-2% additives, and 0.5-1.5% wax powder. This varnish possesses solvent resistance and excellent scratch resistance without the addition of a curing agent. However, the varnish in this invention is a silicone-based varnish, and its additives contain silicon-based substances. In particular, the matting powder used in its preparation is fumed silica, which, with long-term use, can easily cause silicosis and even lung cancer, affecting human health. For example, Chinese patent CN111040554A discloses a water-based high-gloss varnish composed of the following components by weight percentage: 48-60 wt% hydroxy acrylic resin, 20-30 wt% acrylic resin, 1-2 wt% wetting agent, 5-8 wt% curing agent, 0.1-2 wt% defoamer, 0.1-2 wt% thickener, and the balance being deionized water. The hydroxy acrylic resin is JND42D-45 type hydroxy acrylic resin, and the acrylic resin is R-34 type acrylic resin. This varnish is VOC-free and exhibits good adhesion, water resistance, sebum resistance, and gloss. However, the aforementioned varnish uses acrylic resin, which is relatively expensive and has poor chemical stability and durability.

[0004] Therefore, there is a current need for a multi-functional varnish coating that uses readily available and inexpensive raw materials and has high adhesion, abrasion resistance, yellowing resistance, and high gloss. Summary of the Invention

[0005] This invention addresses the problems existing in the prior art by providing a high-adhesion waterborne polyester varnish coating and its preparation method. The varnish coating uses simple and inexpensive raw materials and has multiple benefits such as high adhesion, abrasion resistance, yellowing resistance, and high gloss, making it suitable for large-scale production.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] This invention provides a high-adhesion waterborne polyester varnish coating, comprising a main agent, auxiliary agents, and a solvent; the main agent comprises polyurethane resin and polyester resin, wherein the weight ratio of polyurethane resin to polyester resin is 30-45:12-20; the auxiliary agents comprise defoamer, leveling agent, surfactant, and wetting and dispersing agent; the solvent comprises ethylene glycol butyl ether and / or ethylene glycol ethyl ether.

[0008] Preferably, the high-adhesion waterborne polyester varnish coating comprises polyurethane resin, polyester resin, liquid defoamer, powder defoamer, leveling agent, surfactant, wetting and dispersing agent, and solvent.

[0009] Preferably, by weight, the high-adhesion waterborne polyester varnish coating comprises 30-50 parts polyurethane resin, 10-25 parts polyester resin, 0.01-0.1 parts liquid defoamer, 0.05-0.2 parts powder defoamer, 0.5-0.8 parts leveling agent, 0.2-0.8 parts surfactant, 0.05-0.1 parts wetting and dispersing agent, and 25-30 parts solvent.

[0010] More preferably, by weight, the high-adhesion waterborne polyester varnish coating comprises 35 parts polyurethane resin, 12 parts polyester resin, 0.05 parts liquid defoamer, 0.05 parts powder defoamer, 0.6 parts leveling agent, 0.2 parts surfactant, 0.05 parts wetting and dispersing agent, and 30 parts solvent.

[0011] Preferably, the weight ratio of the liquid defoamer, powder defoamer and surfactant is 0.01-0.1:0.05-0.1:0.2.

[0012] Preferably, the liquid defoamer is an organosilicon defoamer; the powder defoamer is a modified polyether defoamer.

[0013] More preferably, the liquid defoamer includes BYK-024 defoamer; the powder defoamer includes Nanjing Xinyi Synthetic FS202 defoamer.

[0014] Preferably, the leveling agent is an ionic polyacrylate non-silicone leveling agent; the surfactant is a nonionic surfactant; and the wetting and dispersing agent is a nonionic wetting and dispersing agent.

[0015] More preferably, the leveling agent includes Ziyi ZY-1833 leveling agent; the surfactant includes fatty acid polyoxyethylene ester; and the wetting and dispersing agent includes Dispers 740w.

[0016] The present invention also provides a method for preparing the above-mentioned high-adhesion waterborne polyester varnish coating, comprising the following steps:

[0017] S1. Mix the polyurethane resin and polyester resin in the prescribed amounts with the solvent, then disperse and stir to obtain a slurry;

[0018] S2. Add the formulated amounts of powdered defoamer, liquid defoamer, and leveling agent to the slurry in sequence, and stir evenly to obtain a mixture.

[0019] S3. Add the formulated amount of surfactant and wetting and dispersing agent to the mixture and stir to obtain the high-adhesion waterborne polyester varnish coating.

[0020] Preferably, the stirring conditions in step S1 are: 800-1000 rpm and 20-40 min.

[0021] More preferably, the stirring conditions in step S1 are: 1000 rpm and 40 min.

[0022] Preferably, the stirring conditions in step S2 are: 400-500 rpm and 10-20 min.

[0023] More preferably, the stirring conditions in step S2 are: 400 rpm and 20 min.

[0024] Preferably, the stirring conditions in step S3 are: 50-100 rpm and 10-20 min.

[0025] More preferably, the stirring conditions in step S3 are: 100 rpm and 10 min.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The main agent in the high-adhesion waterborne polyester varnish coating of this invention undergoes a cross-linking reaction under the action of auxiliary agents, forming a stable and dense film structure. The polyurethane resin and polyester resin in this invention exhibit superior effects within specific dosage and ratio ranges. The use of specific defoamers and surfactants in the raw materials of this invention, when used in combination with the main agent, further enhances the effect. After application, the high-adhesion waterborne polyester varnish coating of this invention exhibits higher adhesion, abrasion resistance, yellowing resistance, and gloss, making it more suitable for large-scale industrial production. Detailed Implementation

[0028] The present invention will be described below through specific embodiments to make the technical solution of the present invention easier to understand and master. However, the present invention is not limited thereto. The described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, which should be understood to include values ​​close to them. For numerical ranges, one or more new numerical ranges can be obtained by combining the endpoint values ​​of the ranges, the endpoint values ​​of the ranges with individual point values, and individual point values ​​with each other, and these numerical ranges should be considered as specifically disclosed herein. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein include both singular and plural indicators. Numerical ranges expressed by endpoints include all numerical values ​​and fractions within the corresponding range, as well as the expressed endpoints.

[0030] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort should fall within the scope of protection of this invention. Unless otherwise specified, the experimental methods described in the following embodiments are conventional methods; the reagents and materials described, unless otherwise specified, are commercially available.

[0031] The raw materials used in this invention are sourced from:

[0032] Byk-024 liquid defoamer, BYK Chemical;

[0033] Powder defoamer FS202, Nanjing Xinyi Synthetic Technology Co., Ltd.;

[0034] Surfactant: Fatty acid polyoxyethylene ester CAS: 4119-82-8;

[0035] Leveling agent: ZY-1833, Shanghai Ziyi Chemical Co., Ltd.;

[0036] Wetting and dispersing agent: Dispers 740W;

[0037] Polyurethane resin: AH-1720A, Anhui Huatai;

[0038] Polyester resin: BUTANOX M-50, Wanqing Chemical Technology Co., Ltd.

[0039] Example 1

[0040] A high-adhesion waterborne polyester varnish coating, by weight, is composed of 35 parts AH-1720A polyurethane resin, 12 parts BUTANOX M-50 polyester resin, 0.05 parts byk-024 liquid defoamer, 0.05 parts FS202 powder defoamer, 0.6 parts ZY-1833 leveling agent, 0.2 parts fatty acid polyoxyethylene ester surfactant, 0.05 parts Dispers 740w wetting and dispersing agent, and 30 parts ethylene glycol ethyl ether.

[0041] The preparation method is as follows:

[0042] S1. Mix the polyurethane resin and polyester resin of the specified amounts with the solvent, disperse and stir for 40 minutes at a speed of 1000 rpm to obtain a slurry;

[0043] S2. Add the formulated amounts of powdered defoamer, liquid defoamer, and leveling agent to the slurry in sequence, stir evenly at a speed of 400 rpm for 20 minutes to obtain a mixture.

[0044] S3. Add the formulated amount of surfactant and wetting and dispersing agent to the mixture, and stir at 100 rpm for 10 min to obtain the high-adhesion waterborne polyester varnish coating.

[0045] Example 2

[0046] A high-adhesion waterborne polyester varnish coating, by weight, is composed of 30 parts AH-1720A polyurethane resin, 15 parts BUTANOX M-50 polyester resin, 0.01 parts byk-024 liquid defoamer, 0.1 parts FS202 powder defoamer, 0.5 parts ZY-1833 leveling agent, 0.2 parts fatty acid polyoxyethylene ester surfactant, 0.08 parts Dispers 740w wetting and dispersing agent, and 25 parts ethylene glycol ethyl ether.

[0047] The preparation method is as follows:

[0048] S1. Mix the polyurethane resin and polyester resin of the specified amount with the solvent, disperse and stir for 30 minutes at a speed of 800 rpm to obtain a slurry;

[0049] S2. Add the formulated amounts of powdered defoamer, liquid defoamer, and leveling agent to the slurry in sequence, stir evenly at a speed of 500 rpm for 15 minutes to obtain a mixture.

[0050] S3. Add the formulated amount of surfactant and wetting and dispersing agent to the mixture, and stir at 85 rpm for 15 min to obtain the high-adhesion waterborne polyester varnish coating.

[0051] Example 3

[0052] A high-adhesion waterborne polyester varnish coating, by weight, is composed of 45 parts AH-1720A polyurethane resin, 20 parts BUTANOX M-50 polyester resin, 0.1 parts byk-024 liquid defoamer, 0.1 parts FS202 powder defoamer, 0.6 parts ZY-1833 leveling agent, 0.2 parts fatty acid polyoxyethylene ester surfactant, 0.1 parts Dispers 740w wetting and dispersing agent, and 28 parts ethylene glycol butyl ether.

[0053] The preparation method is as follows:

[0054] S1. Mix the polyurethane resin and polyester resin of the specified amounts with the solvent, disperse and stir for 20 minutes at a speed of 1000 rpm to obtain a slurry;

[0055] S2. Add the formulated amounts of powdered defoamer, liquid defoamer, and leveling agent to the slurry in sequence, stir evenly at a speed of 450 rpm for 10 minutes to obtain a mixture.

[0056] S3. Add the formulated amount of surfactant and wetting and dispersing agent to the mixture, and stir at 50 rpm for 20 min to obtain the high-adhesion waterborne polyester varnish coating.

[0057] Example 4

[0058] A high-adhesion waterborne polyester varnish coating, by weight, is composed of 50 parts AH-1720A polyurethane resin, 25 parts BUTANOX M-50 polyester resin, 0.05 parts byk-024 liquid defoamer, 0.05 parts FS202 powder defoamer, 0.8 parts ZY-1833 leveling agent, 0.8 parts fatty acid polyoxyethylene ester surfactant, 0.05 parts Dispers 740w wetting and dispersing agent, and 30 parts ethylene glycol ethyl ether.

[0059] The preparation method is the same as in Example 1.

[0060] Comparative Example 1

[0061] A high-adhesion waterborne polyester varnish coating, by weight, is composed of 30 parts AH-1720A polyurethane resin, 22 parts BUTANOX M-50 polyester resin, 0.05 parts byk-024 liquid defoamer, 0.05 parts FS202 powder defoamer, 0.6 parts ZY-1833 leveling agent, 0.2 parts fatty acid polyoxyethylene ester surfactant, 0.05 parts Dispers 740w wetting and dispersing agent, and 30 parts ethylene glycol ethyl ether.

[0062] The preparation method is the same as in Example 1.

[0063] Comparative Example 2

[0064] A high-adhesion waterborne polyester varnish coating, by weight, is composed of 28 parts AH-1720A polyurethane resin, 14 parts BUTANOX M-50 polyester resin, 0.03 parts byk-024 liquid defoamer, 0.05 parts FS202 powder defoamer, 0.6 parts ZY-1833 leveling agent, 0.3 parts fatty acid polyoxyethylene ester surfactant, 0.05 parts Dispers 740w wetting and dispersing agent, and 30 parts ethylene glycol ethyl ether.

[0065] The preparation method is the same as in Example 1.

[0066] Comparative Example 3

[0067] A high-adhesion waterborne polyester varnish coating, by weight, is composed of 35 parts benzomelamine-formaldehyde resin, 12 parts BUTANOX M-50 polyester resin, 0.05 parts byk-024 liquid defoamer, 0.05 parts FS202 powder defoamer, 0.6 parts Shanggao Sago-3277 fluorocarbon modified polyacrylate leveling agent, 0.2 parts fatty acid polyoxyethylene ester surfactant, 0.05 parts Digo Dispers 740w wetting and dispersing agent, and 30 parts ethylene glycol ethyl ether.

[0068] The preparation method is the same as in Example 1.

[0069] Example of effect

[0070] Sample preparation: Using an air spraying device, the high-adhesion waterborne polyester varnish coatings prepared in Examples 1-4 and Comparative Examples 1-3 were sprayed onto test plates with a film thickness of 14-16 μm. After leveling at room temperature for 5 minutes, the plates were baked in an 80℃ oven for 30 minutes and then aged in an 80℃ oven for 4 hours before performance testing.

[0071] In the performance test: (1) Adhesion test adopts the cross-cut test method. Use a cross-cut knife to make 10×10 (100) 1mm×1mm grids on the surface of the test sample. Each line should not cut through the sample. Use a brush to gently clean the impurities. Use an adhesive tape roller to stick 3M 600 tape to the sample surface and press the load 20N. The roller speed is 300mm / min. Roll each sample 3 times. After standing for 5 minutes, grab the edge of the tape by hand and pull the tape at a 90-degree angle to the sample plane to quickly tear off the tape. Use a magnifying glass to observe the sample surface, count the grids where the varnish is peeled off, and express the peeling area as a percentage. (2) Abrasion resistance is tested using a SUTHERLAND 2000 abrasion tester. Under 2 psi pressure and Speed ​​4 conditions, 200 round trips are performed to test the abrasion resistance. (3) Yellowing resistance was tested by placing a sample coated with high-adhesion water-based polyester varnish in a 60°C oven for 7 days and observing whether it yellowed. (4) Gloss (60°C): The gloss was tested according to GB / T1743-79, the method for determining the gloss of paint films. The specific test results are shown in Table 1 below.

[0072] Table 1 Performance test results of each group of high-adhesion waterborne polyester varnish coatings

[0073]

[0074]

[0075] Note: The rating in Table 1 is divided into 1-5 levels, with level 1 being the best and level 5 being the worst.

[0076] According to the data in Table 1, the high-adhesion waterborne polyester varnish coating of the present invention has excellent adhesion, abrasion resistance, yellowing resistance and gloss. When the weight ratio of polyurethane resin to polyester resin is 30-45:12-20, and the weight ratio of liquid defoamer, powder defoamer and surfactant is 0.01-0.1:0.05-0.1:0.2, it has better performance.

[0077] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A high-adhesion waterborne polyester varnish coating, characterized in that: By weight, it consists of 30-50 parts polyurethane resin, 10-25 parts polyester resin, 0.01-0.1 parts liquid defoamer, 0.05-0.2 parts powder defoamer, 0.5-0.8 parts leveling agent, 0.2-0.8 parts surfactant, 0.05-0.1 parts wetting and dispersing agent, and 25-30 parts solvent; The weight ratio of the polyurethane resin to the polyester resin is 30-45:12-20; The weight ratio of the liquid defoamer, powder defoamer, and surfactant is 0.01-0.1:0.05-0.1:0.2; The solvent includes ethylene glycol butyl ether and / or ethylene glycol ethyl ether; The leveling agent is an ionic polyacrylate non-silicone leveling agent.

2. The high-adhesion waterborne polyester varnish coating according to claim 1, characterized in that: The liquid defoamer is an organosilicon defoamer; the powder defoamer is a modified polyether defoamer.

3. The high-adhesion waterborne polyester varnish coating according to claim 1, characterized in that: The surfactant is a nonionic surfactant; the wetting and dispersing agent is a nonionic wetting and dispersing agent.

4. The method for preparing the high-adhesion waterborne polyester varnish coating according to any one of claims 1-3, characterized in that: Includes the following steps: S1. Mix the polyurethane resin and polyester resin in the prescribed amounts with the solvent, then disperse and stir to obtain a slurry; S2. Add the formulated amounts of powdered defoamer, liquid defoamer, and leveling agent to the slurry in sequence, and stir evenly to obtain a mixture. S3. Add the formulated amount of surfactant and wetting and dispersing agent to the mixture and stir to obtain the high-adhesion waterborne polyester varnish coating.

5. The preparation method according to claim 4, characterized in that: The stirring conditions described in step S1 are: 800-1000 rpm and 20-40 min.

6. The preparation method according to claim 4, characterized in that: The stirring conditions described in step S2 are: 400-500 rpm for 10-20 min.

7. The preparation method according to claim 4, characterized in that: The stirring conditions described in step S3 are: 50-100 rpm for 10-20 min.

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