Water-based single-component full matt finish coating material for woodware roller coating and application

Abstract

The invention belongs to the technical field of wood lacquer, and particularly relates to a water-based single-component full matt finish coating material for wood roller coating. The water-based paint is prepared from the following raw materials in parts by weight: 50-60 parts of a water-based acrylic copolymer, 15-20 parts of a water-based polyurethane dispersion, 2-5 parts of a coalescing agent, 0.5-1 part of a defoaming agent, 0.5-2 parts of a wetting agent, 0.5-2 parts of a dispersing agent, 3-5 parts of a wax additive and 5-10 parts of water. The coating provided by the invention solves the problems of poor liquid resistance, low hardness, insufficient transparency and poor roller coating constructability of an existing water-based single-component full matt finish coating material, and meanwhile, the adhesive force of the coating in the field of UV roller coating large board subdivision is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wood coatings, and in particular relates to a water-based single-component full matte surface coating material used for wood roller coating and an application thereof. Background Art

[0002] Water-based materials have made great progress in the fields of industry, home decoration, wood products, etc., and segmented products for different fields have emerged. Among them, water-based wood products have been successfully applied in home decoration and ordinary furniture, and the market share has been expanding. However, in some mechanical coating applications, such as roller coating, conventional water-based single-component wood products are difficult to meet the performance and construction requirements required by customers, and the market is quite blank. In particular, the demand for full matte effect coatings for large-plate roller coating is the most urgent, and its transparency, adhesion, hardness and other properties need to be improved urgently.

[0003] At present, improving the above problems is usually considered from two perspectives: one is the selection of the main resin, and the other is the application of special functional materials. Currently, the single-component water-based wood resins on the market are generally acrylic emulsions, composites or hybrids of water-based acrylic and polyurethane, and water-based polyurethane dispersions. Regardless of which film-forming material is used, the performance improvement will be limited by the raw materials, formula, and process, resulting in problems such as insufficient density of the paint film, low hardness, poor liquid resistance, poor stain resistance, and insufficient adhesion. Summary of the invention

[0004] The purpose of the present invention is to provide a water-based single-component full-matte surface coating material for wood roller coating in view of the above shortcomings, so as to solve the problems of poor liquid resistance, low hardness, insufficient transparency and poor roller coating construction performance of the existing water-based single-component full-matte surface coating materials, and at the same time improve the adhesion of the coating in the UV roller coating large board segment.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A water-based one-component full matte surface coating material for wood roller coating, which is prepared from raw materials including the following substances in parts by weight:

[0007]

[0008] In some embodiments, the method is prepared from raw materials including the following substances, in parts by weight:

[0009]

[0010] In some embodiments, the method is prepared from raw materials including the following substances, in parts by weight:

[0011]

[0012] In some embodiments, the waterborne acrylic copolymer is selected from Archroma 8088, which adopts self-crosslinking-core-shell dual technology, is a copolymer emulsion with P(MMA-EA) as the main body, with polymethyl methacrylate (PMMA) monomer as the shell and phenylethyl acrylate (PEA) as the core. At the same time, polybutadiene (PB) modified with crosslinking agent divinylbenzene (DVB) is added to the core to control the grafting rate of polymethyl methacrylate (PMMA) on polybutadiene (PB), and hydroxyethyl cellulose is introduced to control the particle size of the emulsion particles to obtain a highly transparent, self-matting aqueous dispersion.

[0013] In some embodiments, the aqueous polyurethane dispersion is an aliphatic polyurethane dispersion, specifically an aliphatic polyurethane dispersion synthesized using isophorone diisocyanate (IPDI), polybutylene adipate diol (PBA), dimethylol propionic acid (DMPA), etc. as main raw materials, with a solid content of 33-36% and a pH of 7.5-8.5, such as Xiangfeng PUBONDCF8011.

[0014] In some embodiments, the thickener is selected from polyurethane thickeners, such as CoapurXS71 from COATEX and R-2050D from Rohm and Haas.

[0015] In some embodiments, the film-forming aid is a mixture of dipropylene glycol methyl ether and dipropylene glycol butyl ether in a mass ratio of 2:2.

[0016] In some embodiments, the defoaming agent comprises at least two components of organosiloxane, polyether, and polyether-modified silicone oil. Specifically, the available products include BYK094 and BYK024 from BYK, and TEGOfoamex 810 and TEGO AIREX 902W defoaming agents from EVONIK.

[0017] In some embodiments, the wetting agent is a silicone-type leveling agent, which is mainly composed of a polyether-modified compound of polydimethylsiloxane, such as BYK-3455, Deqian Levaslip 455, and the like.

[0018] In some embodiments, the dispersant may be selected from TEGO Dispers 715W, DISPERBYK-190 and the like from TEGO Company of Germany.

[0019] In some embodiments, the organic matting powder is a thermosetting polymethyl urea resin, which has surface properties and advantages that cannot be obtained by standard matting agents such as traditional white carbon black or wax. Its addition to water-based wood products can increase the water resistance of the paint film, provide better smooth feel and scratch resistance, and also has excellent UV stability, which can effectively improve the weather resistance of the coating. Available products include the M6 ​​series of matting powders from Albemarle Corporation of the United States.

[0020] In some embodiments, the wax additive is a modified polyethylene wax emulsion, and available products include Jingzhijie W171A.

[0021] The present invention also provides the use of the water-based single-component full-matte surface coating material in wood roller coating.

[0022] The beneficial effects of the present invention are:

[0023] 1. The coating of the present invention uses a self-crosslinking-core-shell dual technology to synthesize an acrylic copolymer emulsion, so that the paint film has excellent matteness, transparency and liquid resistance;

[0024] 2. The present invention adds waterborne polyurethane dispersion to the coating, further improving the workability, adhesion and hardness of the paint film;

[0025] 3. The present invention uses thermosetting polymethylurea resin as the effect material, which avoids the water permeability of the paint film and further enhances the liquid resistance;

[0026] 4. The present invention adopts a nonionic polyurethane thickener, which ensures the applicability in roller coating construction and also improves the fullness of the paint film and the amount of paint applied;

[0027] 5. The water-based one-component full matte coating material of the present invention is a water-based environmentally friendly product, which meets the standards of "GB 18581-2020" for the limit of harmful substances in wood coatings and "GB / T 23999-2009" for water-based wood coatings for interior decoration. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described in detail below in conjunction with embodiments, but the protection scope of the present invention is not limited to the following.

[0029] Example 1

[0030] A water-based one-component full matte surface coating material for wood roller coating is prepared, comprising the following steps:

[0031] S1. Weigh the following raw materials by weight: 60 parts of water-based acrylic copolymer (Angao 8088), 20 parts of waterborne polyurethane dispersion (Xiangfeng PUBOND CF8011), 1 part of polyurethane thickener (XS-71), 2 parts of dipropylene glycol methyl ether, 2 parts of dipropylene glycol butyl ether, 0.5 parts of defoamer (TEGO-810), 0.5 parts of defoamer (BYK-024), 0.5 parts of wetting agent (BYK-3455), 0.5 parts of dispersant (BYK-190), 2 parts of organic matting powder (M6), 3 parts of polyethylene wax emulsion (W171A), 8 parts of water;

[0032] S2. The above-mentioned aqueous acrylic copolymer, aqueous polyurethane dispersion, polyurethane thickener, dipropylene glycol methyl ether, dipropylene glycol butyl ether, defoamer (TEGO-810), defoamer (BYK-024), and wetting agent are mixed evenly, dispersed at 1500r / min for 5 minutes until there is no oil shrinkage, and then the dispersant is added at a low speed, and then the organic matting powder and polyethylene wax emulsion are added and dispersed to a fineness of ≤35μm, and finally water is added to adjust the viscosity.

[0033] Comparative Example 1

[0034] A water-based single-component full matte coating material for wood roller coating was prepared, wherein the preparation method was the same as that in Example 1, except that the water-based acrylic copolymer in the component was replaced with a common emulsion on the market: allnex SETAQUA6785.

[0035] Comparative Example 2

[0036] A water-based single-component full matte coating material for wood roller coating was prepared, wherein the preparation method was the same as that in Example 1, except that the water-based polyurethane dispersion in the component was replaced with a common dispersion on the market: R2180 from DSM.

[0037] Comparative Example 3

[0038] A water-based one-component full matte coating material for wood roller coating was prepared. The preparation method was the same as that in Example 1, except that the polyurethane thickener in the component was replaced with an associative thickener: Deqian RHEOLATE 299. In addition, the amount of each component was slightly different, as follows:

[0039] 60 parts of water-based acrylic copolymer, 20 parts of water-based polyurethane dispersion, 0.5 parts of associative thickener (RHEOLATE299), 2 parts of dipropylene glycol methyl ether, 2 parts of dipropylene glycol butyl ether, 0.5 parts of defoamer (TEGO-810), 0.5 parts of defoamer (BYK-024), 0.5 parts of wetting agent (BYK-3455), 0.5 parts of dispersant (BYK-190), 2 parts of organic matting powder (M6), 3 parts of polyethylene wax emulsion (W171A), 8.5 parts of water.

[0040] Comparative Example 4

[0041] A water-based single-component full matte coating material for wood roller coating was prepared. The preparation method was the same as that of Example 1, except that no water-based polyurethane dispersion was used in the component, and the amount of each component was slightly different, as follows:

[0042] 60 parts of water-based acrylic copolymer, 0.5 parts of polyurethane thickener, 2 parts of dipropylene glycol methyl ether, 2 parts of dipropylene glycol butyl ether, 0.5 parts of defoamer (TEGO-810), 0.5 parts of defoamer (BYK-024), 0.5 parts of wetting agent, 0.5 parts of dispersant, 2 parts of organic matting powder, 3 parts of polyethylene wax emulsion, 8.5 parts of water.

[0043] The physical and chemical properties of the water-based one-component full matte coating material prepared in the above-mentioned Example 1 and various comparative examples are shown in Table 1 below.

[0044] Table 1

[0045]

[0046] The performance of the water-based one-component full matte coating materials prepared in the above examples and comparative examples was evaluated by using a Senlian TGZ-D roller coating machine. All roller coating tests were conducted on a 30cm×40cm×2cm UV transparent substrate, which had been subjected to UV roller coating flooring. The net coating amount of roller coating was 40-50g / m 2 , leveling at room temperature for 2 minutes, and drying under 50℃ light wave drying line for 7 to 8 minutes. The evaluation results are shown in Table 2 below.

[0047] Table 2

[0048]

[0049]

[0050] From Table 2 and Table 3, it can be seen that the water-based one-component full matte topcoat material for roller coating provided by the present invention not only meets the roller coating construction occasions, but also has good matte and transparency, and also ensures excellent adhesion and high hardness, and can fully meet the national standards in terms of physical and chemical properties.

[0051] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A water-based one-component full matte surface coating material for wood roller coating, characterized in that: The invention is prepared from the following raw materials, in parts by weight:

2. The water-based one-component full matte surface coating material for wood roller coating according to claim 1, characterized in that: The invention is prepared from the following raw materials, in parts by weight:

3. The water-based one-component full matte surface coating material for wood roller coating according to claim 2, characterized in that: The invention is prepared from the following raw materials, in parts by weight:

4. A water-based one-component full matte surface coating material for wood roller coating according to any one of claims 1 to 3, characterized in that: The aqueous polyurethane dispersion is an aliphatic polyurethane dispersion.

5. A water-based one-component full matte surface coating material for wood roller coating according to any one of claims 1 to 3, characterized in that: The thickener is selected from polyurethane thickeners.

6. A water-based one-component full matte surface coating material for wood roller coating according to any one of claims 1 to 3, characterized in that: The film-forming aid is prepared by mixing dipropylene glycol methyl ether and dipropylene glycol butyl ether in a mass ratio of 2:

2.

7. A water-based one-component full matte surface coating material for wood roller coating according to any one of claims 1 to 3, characterized in that: The defoamer contains at least two components of organic siloxane, polyether and polyether-modified silicone oil.

8. A water-based one-component full matte surface coating material for wood roller coating according to any one of claims 1 to 3, characterized in that: The wax additive is a modified polyethylene wax emulsion.

9. Use of the water-based one-component full matte surface coating material according to any one of claims 1 to 3 in roller coating of wood.

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