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CN-122011858-A - Water-based woodware varnish and preparation method and application thereof

CN122011858ACN 122011858 ACN122011858 ACN 122011858ACN-122011858-A

Abstract

The invention belongs to the technical field of coatings, and particularly relates to a water-based woodware top-coat paint, a preparation method and application thereof. The aqueous wood flour-cleaning paint comprises aqueous emulsion, organic silicon compound, functional auxiliary agent, thickener, wetting agent and water, wherein the aqueous emulsion comprises self-crosslinking acrylic acid copolymer emulsion and emulsion A, the emulsion A is selected from any one of self-crosslinking acrylic acid homo-polymer emulsion and polycarbonate modified polyurethane emulsion, the organic silicon compound comprises at least one of silane and silanol, the functional auxiliary agent comprises any one of functional auxiliary agent 1 and functional auxiliary agent 2, the functional auxiliary agent 1 comprises mildew preventive A and mildew preventive B, the functional auxiliary agent 2 comprises mildew preventive C, ultraviolet light absorber and ultraviolet light stabilizer, and the thickener comprises high-shear, medium-shear and low-shear polyurethane thickener. The water-based wood varnish has good comprehensive properties of mildew resistance, weather resistance, chemical resistance, blocking resistance and the like, and can be used for coating outdoor wood products or semi-outdoor wood products.

Inventors

  • DAI ZHIHAO
  • WANG YINGYING
  • ZHOU JUN

Assignees

  • 广州立邦涂料有限公司
  • 立邦涂料（中国）有限公司

Dates

Publication Date
20260512
Application Date
20260312

Claims (10)

  1. 1. The water-based wood clear paint is characterized by comprising water-based emulsion, an organosilicon compound, a functional auxiliary agent, a thickener, a wetting agent and water; the aqueous emulsion comprises self-crosslinking acrylic acid copolymer emulsion and emulsion A; The emulsion A is selected from any one of self-crosslinking acrylic acid homo-emulsion and polycarbonate modified polyurethane emulsion; the organosilicon compound comprises at least one of silane and silanol; the functional auxiliary agent comprises any one of the functional auxiliary agent 1 and the functional auxiliary agent 2; The functional auxiliary agent 1 comprises a mildew preventive A and a mildew preventive B, and the functional auxiliary agent 2 comprises a mildew preventive C, an ultraviolet light absorber and an ultraviolet light stabilizer; the mildew preventive A comprises 2-octyl-3 (2H) -isothiazolone, the mildew preventive B comprises 3-iodo-2-propynyl butylcarbamate, and the mildew preventive C comprises 4, 5-dichloro-2-octyl-3 (2H) -isothiazolone; The thickener includes a high shear polyurethane thickener, a medium shear polyurethane thickener and a low shear polyurethane thickener.
  2. 2. The aqueous wood finish according to claim 1, wherein the self-crosslinking acrylic copolymer emulsion has a minimum film forming temperature of 3-18 ℃; and/or the lowest film forming temperature of the self-crosslinking acrylic acid homo-emulsion is 0-15 ℃ or 30-36 ℃; And/or the silane comprises polysilane and/or the silanol comprises an organosilicon alcohol.
  3. 3. The aqueous woodware top-coat according to claim 1, wherein when the emulsion A is a self-crosslinking acrylic acid homo-emulsion, the mass ratio of the self-crosslinking acrylic acid copolymer emulsion to the self-crosslinking acrylic acid homo-emulsion is (0.8-2.7): 1; And/or, when the emulsion A is a polycarbonate modified polyurethane emulsion, the mass ratio of the self-crosslinking acrylic copolymer emulsion to the polycarbonate modified polyurethane emulsion is (0.7-3.0): 1.
  4. 4. The aqueous wood varnish according to claim 1, wherein the weight ratio of the mildew inhibitor A to the mildew inhibitor B is 1 (0.1-0.5); And/or the weight ratio of the mildew preventive auxiliary agent C to the ultraviolet light absorber to the ultraviolet light stabilizer is 1 (0.2-2.2) to 0.1-1.1.
  5. 5. The aqueous wood varnish as claimed in claim 1, wherein the weight ratio of the high shear polyurethane thickener, the medium shear polyurethane thickener and the low shear polyurethane thickener is 1 (0.4-1.4): 0.1-0.8; And/or the high shear polyurethane thickener has a shear rate of 100 to 2000s -1 ; and/or the shear rate of the medium shear polyurethane thickener is 5-15s -1 ; And/or the shear rate of the low shear polyurethane thickener is 0.05 to 0.15s -1 .
  6. 6. The aqueous wood varnish as claimed in claim 1, wherein the aqueous wood varnish comprises 64-90% of aqueous emulsion, 0.1-1.0% of organic silicon compound, 0.05-3.0% of functional auxiliary agent, 0.2-3.0% of thickener, 0.1-1.0% of wetting agent and 4-22% of water by weight percent.
  7. 7. The aqueous wood finish according to any one of claims 1-6, further comprising at least one of a film forming aid, a defoamer, a leveling agent, a wax emulsion, an anti-sagging aid, a biocide.
  8. 8. The aqueous wood varnish according to claim 7, wherein the aqueous wood varnish further comprises a film forming aid, a defoamer, a leveling agent, a wax emulsion, an anti-sagging aid and a bactericide, and the aqueous wood varnish comprises, by weight, 64-90% of an aqueous emulsion, 0.1-1.0% of an organosilicon compound, 0.05-3.0% of a functional aid, 0.2-3.0% of a thickener, 0.1-1.0% of a wetting agent, 2-7.0% of a film forming aid, 0.2-1.0% of a defoamer, 0.05-1.0% of a leveling agent, 0.5-4.0% of a wax emulsion, 0.2-3.5% of an anti-sagging aid, 0.05-0.3% of a bactericide and 4-22% of water.
  9. 9. The method for preparing the water-based wood varnish as claimed in any one of claims 1 to 8, which is characterized by comprising the following steps: Mixing the raw material components to obtain the final product.
  10. 10. A wood product comprising the aqueous wood finish of any one of claims 1-8.

Description

Water-based woodware varnish and preparation method and application thereof Technical Field The invention belongs to the technical field of coatings, and particularly relates to a water-based woodware top-coat paint, a preparation method and application thereof. Background In recent years, along with the development of society, people have higher and higher requirements on environmental protection, and waterborne wood products are rapidly developed and widely applied, but the waterborne wood products are mainly limited to the field of subdivision of specific furniture. For indoor products, the water-based wood paint is widely applied to the fields of furniture, floors and the like, and part of products have performances close to those of oily paint, so that the environment-friendly advantage is obvious. For outdoor wood products, certain problems in performance need to be solved, such as easy discoloration, cracking and mildew of wood furniture. Especially in the environment of high temperature and high humidity in summer and wet cooling in winter, the problem is more pronounced. One of the concrete performances is that the weather resistance and mildew resistance are poor, and the coated wood products are used in outdoor pavilions, fences, railings and other scenes, and because of the influence of factors such as rainwater, sunlight and the like, the wood products are easy to expand with heat and contract with cold, so that paint films are yellow, cracked, mildewed and the like. The second concrete expression is that the chemical resistance, the pollution resistance and the blocking resistance are to be improved, the coated wooden products are used in the scenes of balconies, outdoor tables, chairs, trestle and the like, the blocking condition is easy to occur, and the common living chemicals and stains such as baking soda which are inevitably contacted are easy to cause the color change of a paint film. The prior art mainly improves the woodenware top-coat paint by the following technical approaches that 1) alkyd resin system or aqueous alkyd emulsion system. 2) Aqueous acrylic emulsion systems or modified acrylic emulsion systems, such as single self-crosslinking acrylic resin dispersions (minimum film forming temperature (MFFT) of 0-12 ℃ and glass transition temperature (Tg) of-20-120 ℃) or self-crosslinking nanoscale polymers or self-crosslinking pure acrylic emulsions (MFFT of-5 ℃) or silicone modified acrylic copolymer emulsions. They compensate for the fine cracking of wood by forming a flexible paint film after film formation, preventing rapid corrosion of wood due to cracking and direct exposure to rain and sunlight. However, the alkyd system or the aqueous alkyd emulsion system has slow drying of a paint film, and the paint film has flexibility but poor blocking resistance, is generally used for 'non-contact' surface coating of outdoor wooden products, and is not suitable for 'contact' surface coating of outdoor wooden products, semi-outdoor wooden products such as balconies and the like. In addition, the protection of outdoor wood products is mainly divided into two parts, namely, the wood is reinforced in lignin of the wood, and a paint film with certain toughness is formed on the surface of the wood. And a single acrylic emulsion or modified emulsion thereof has difficulty in combining the two protection mechanisms, so that the protection effect is poor. In addition, because of the expend with heat and contract with cold of woodwork, especially use in summer high temperature high humidity environment and winter wet and cold environment, brush protection often is less than 2 years, and the woodwork can lead to fracture and mildewing because of the inefficacy of protective layer, is difficult to realize the long-term decoration protection of outdoor scene. Therefore, the water-based wood varnish with good anti-blocking property, weather resistance, mildew resistance and chemical resistance has very important significance. Disclosure of Invention The present invention aims to solve one or more of the technical problems of the prior art described above, and at least provides an advantageous option. In particular, the invention provides a water-based woodware varnish, which has good anti-blocking property, weather resistance, mildew resistance and chemical resistance. The water-based wood flour-cleaning paint comprises water-based emulsion, an organosilicon compound, a functional auxiliary agent, a thickening agent, a wetting agent and water, wherein the water-based emulsion comprises self-crosslinking acrylic acid copolymer emulsion and emulsion A, the emulsion A is selected from any one of self-crosslinking acrylic acid homo-polymer emulsion and polycarbonate modified polyurethane emulsion, the organosilicon compound comprises at least one of silane and silanol, the functional auxiliary agent comprises any one of the functional auxiliary agent 1 and the functional auxiliary agent 2, the functiona