CN-121991562-A - Two-component waterborne wood seal primer, seal coating formed by two-component waterborne wood seal primer and product

Abstract

The present invention relates to a two-component waterborne wood sealer, a sealer coating formed therefrom, and an article comprising the sealer coating, wherein the two-component waterborne wood sealer coating comprises a film-forming resin composition comprising at least one aqueous cationic resin emulsion and optionally at least one additional additive, and a B-component curing agent composition comprising at least one polyisocyanate. The formed sealing coating can well seal substances such as tannin, grease and the like in wood, and has good grindability.

Inventors

• Wu sai
• LU ZHENLIN
• ZHOU YU

Assignees

• 宣伟(广东)新材料有限公司

Dates

Publication Date

20260508

Application Date

20210528

Claims (18)

1. 1. A two-component waterborne wood sealer comprising: Component A a film-forming resin composition comprising at least one aqueous cationic resin emulsion and optionally at least one additional additive, and And a curing agent composition comprising at least one polyisocyanate.
2. 2. The two-part waterborne wood sealer of claim 1, wherein the weight ratio of the a-part to the B-part is in the range of 100:5 to 100:15.
3. 3. The two-part waterborne wood sealer of claim 1, wherein the waterborne cationic resin emulsion comprises at least one acrylic resin, at least one polyurethane acrylate (PUA), at least one polyurethane resin, at least one epoxy resin, or any combination thereof.
4. 4. The two-part waterborne wood sealer according to any of claims 1-3, wherein said film-forming resin composition comprises, based on the total weight of said film-forming resin composition: 50 to 90 wt% of the at least one aqueous cationic resin emulsion; 2 to 10 weight percent of at least one film forming aid; 2 to 20% by weight of at least one aqueous medium; 0 to 10% by weight of at least one filler, and 0 To 10 wt% of said at least one additional additive, Wherein the at least one additional additive comprises a thickener, a wetting agent, a leveling agent, a defoamer, a dispersant, a pH adjuster, a mildewproof agent, a preservative, or any combination thereof.
5. 5. The two-part waterborne wood sealer according to claim 1, wherein said curative composition comprises at least one nonionic waterborne polyisocyanate.
6. 6. The two-part waterborne wood sealer according to claim 5, wherein said at least one nonionic waterborne polyisocyanate comprises an aliphatic polyisocyanate.
7. 7. The two-component waterborne wood sealer according to claim 5 or 6, wherein said at least one nonionic waterborne polyisocyanate comprises nonionic groups derived from polyethers.
8. 8. The two-part waterborne wood sealer according to claim 7, wherein the polyether comprises polyethylene glycol monoethers, copolymer monoethers of polyethylene glycol and polypropylene glycol, or any combination thereof, preferably selected from polyethylene glycol monomethyl ether, polyethylene glycol monoethyl ether, polyethylene glycol monobutyl ether, poly (ethylene glycol-propylene glycol) monobutyl ether, or any combination thereof.
9. 9. The two-part waterborne wood sealer according to claim 8, wherein said polyether comprises polyethylene glycol monomethyl ether having an average of 5-10 ethyleneoxy (-CH 2 CH 2 -O-) units.
10. 10. The two-part waterborne wood sealer according to claim 1, wherein said curative composition comprises at least one solvent-borne polyisocyanate and at least one co-solvent.
11. 11. The two-part waterborne wood sealer according to claim 10, wherein said at least one solvent-borne polyisocyanate comprises an aliphatic polyisocyanate.
12. 12. The two-component waterborne wood sealer of claim 10, wherein the at least one co-solvent comprises propylene glycol methyl ether acetate (PMA), propylene Glycol Diacetate (PGDA), methyl isobutyl ketone (MIBK), or any combination thereof.
13. 13. The two-part waterborne wood sealer of claim 1, wherein the curative composition comprises at least one nonionic waterborne polyisocyanate, at least one solvent-borne polyisocyanate, and at least one co-solvent.
14. 14. The two-component waterborne wood sealer according to claim 13, wherein the weight ratio of said at least one nonionic waterborne polyisocyanate and said at least one solvent-borne polyisocyanate is in the range of 9:1 to 1:9.
15. 15. The two-part waterborne wood sealer according to claim 13, wherein said curative composition comprises, based on the total weight of said curative composition: 30 to 99.99 weight percent of at least one nonionic aqueous polyisocyanate; 0.01 to 50% by weight of at least one solvent-borne polyisocyanate, and 0 To 20% by weight of at least one cosolvent.
16. 16. The two-part waterborne wood sealer according to any of claims 1-15, wherein said two-part waterborne wood sealer contains no more than 600 g/L of Volatile Organic Compounds (VOCs).
17. 17. A sealer coating formed from the two-component waterborne wood sealer of any of claims 1-16.
18. 18. An article of manufacture, comprising: a wood substrate having at least one major surface, and The sealer coating of claim 17 formed on at least a portion of said major surface.

Description

Two-component waterborne wood seal primer, seal coating formed by two-component waterborne wood seal primer and product The application is a divisional application of Chinese patent application 202110592326.8 with application date of 2021, 5 and 28. Technical Field The invention relates to a two-component water-borne wood sealing primer, a sealing coating formed by the two-component water-borne wood sealing primer and an article comprising the sealing coating. Background Wood products, including wood furniture, are the most commonly used products in production and life, and are mainly made of wood substrates. It is known that wood substrates have special textures, natural colors, and other materials that are incomparable with each other. However, the wooden base material inevitably has characteristics of complex structure, uneven material quality, porosity, swelling and shrinking upon water, and containing undesirable substances such as grease, tannin and other colored impurities. The cationic resin can interact with substances such as tannic acid and pine oil in wood to generate a salt substance which is fixed on an interface by a coating and cannot migrate and exude under the conditions of high temperature and high humidity, so that the coating is prevented from changing color, and a good sealing effect is achieved. Thus, cationic resins are important film forming materials for woodware primer sealers. In the woodware primer seal market, the cationic resin-containing primer occupies about 90% of the market share. Although the single component primer containing the cationic resin has remarkable effect in sealing tannin, the primer has obvious disadvantages such as low hardness, poor grindability and the like. Therefore, there is a need in the wood lacquer field for a sealer which has good sealing effect and at the same time gives a compromise in the grindability of the lacquer film. Disclosure of Invention In one aspect, the present invention provides a two-part waterborne wood sealer comprising a film-forming resin composition comprising at least one aqueous cationic resin emulsion and optionally at least one additional additive, and a B-part curing agent composition comprising at least one polyisocyanate. The component A and the component B are mixed according to a certain weight ratio and then used. In certain embodiments of the invention, the weight ratio of the a component to the B component is in the range of 100:5 to 100:15. In an embodiment of the invention, the at least one aqueous cationic resin emulsion comprises at least one acrylic resin, at least one polyurethane acrylate (PUA), at least one polyurethane resin, at least one epoxy resin, or any combination thereof. In an embodiment of the invention, the curative composition comprises at least one nonionic aqueous polyisocyanate. In other embodiments of the present invention, the curative composition comprises at least one solvent-based polyisocyanate and at least one co-solvent. In still other embodiments of the present invention, the curative composition comprises at least one nonionic aqueous polyisocyanate, at least one solvent-borne polyisocyanate, and at least one co-solvent. In another aspect, the present invention relates to a sealer coating formed from a two-component waterborne wood sealer according to the present invention. In an embodiment according to the invention, the pencil hardness of the sealing coating according to the invention is at least F according to GB/T6739-2006. In addition, the present invention provides an article comprising: a wood substrate having at least one major surface, and A sealer coating formed on at least a portion of the major surface, formed from a two-component waterborne wood sealer primer according to the present invention. The inventors have surprisingly found that by modifying the conventional one-component coating composition containing a cationic resin, matching with a suitable polyisocyanate curing agent, the original one-component coating composition is upgraded to a two-component coating composition, so that not only is the function of the cationic resin to seal acidic substances such as tannins and the like maintained, but also the performance of the film to seal grease is improved, and more importantly, the hardness and the sanding property of the film are improved. Based on the water-based cationic resin emulsion, the invention creatively selects at least one polyisocyanate as a curing agent, upgrades the original single-component cationic seal primer coating composition into a two-component coating composition, not only maintains the function of cationic resin seal tannin, but also improves the property of sealing grease of a paint film, improves the hardness and the polishing property of the paint film, and provides a new thought for the selection of the curing agent in the seal primer for the two-component woodware containing cationic resin, which has not been recognized before the inven