Coating of water-based coating composition containing lignin

Abstract

A lignin-containing aqueous coating composition comprises: 35 to 45 weight percent of a film-forming substance; 35 to 45 weight percent of pigments and fillers; 5 to 15 weight percent of coating additives; and 5 to 20 weight percent of deionized water, wherein the film-forming substance comprises an acrylic copolymer solution and an aqueous solution of lignin sulfonate, the pigments and fillers include titanium dioxide, kaolin, talc and calcium carbonate, and the coating additives include thickeners, dispersants, film-forming aids, defoamers, preservatives and pH adjusters.

Description

Technical Field

[0001] This invention relates to a water-based coating composition, and more particularly to a lignin-containing water-based coating composition, a method for manufacturing the same, and a coating thereof. Prior Technology

[0002] Coatings are used to coat the surface of objects to form a protective or color layer to protect the surface or provide an aesthetic effect. They can be divided into oil-based and water-based coatings according to their raw materials and manufacturing methods.

[0003] When water-based coatings are applied to the surface of an object, the resulting coating may contain pores, which can allow dust and dirt to enter and become difficult to remove.

[0004] The inventors of this case have carefully studied this problem and discovered that if lignin is added to water-based coatings in a specific form, the lignin can fill the voids in the coating formed by the water-based coating, thereby preventing dirt from embedding in the voids and making the dirt difficult to remove. Summary of the Invention

[0005] Therefore, the object of the present invention is to provide a water-based coating composition containing lignin, a method for manufacturing the same, and a coating thereof, which can provide a coating with good stain resistance and easy cleaning properties.

[0006] The present invention provides a lignin-containing waterborne coating composition to solve the problems of the prior art, comprising: 35 to 45 weight percent of film-forming substance; 35 to 45 weight percent of pigments and fillers; 5 to 15 weight percent of coating additives; and 5 to 20 weight percent of deionized water. The film-forming substance comprises an acrylic copolymer solution and an aqueous solution of lignin sulfonate. The pigments and fillers include titanium dioxide, kaolin, talc, and calcium carbonate. The coating additives include thickeners, dispersants, film-forming aids, defoamers, preservatives, and pH adjusters.

[0007] In one embodiment of the present invention, a water-based coating composition containing lignin is provided, wherein the acrylic copolymer solution is a pure acrylic copolymer or a styrene-acrylic copolymer solution.

[0008] In one embodiment of the present invention, an aqueous coating composition containing lignin is provided, wherein the aqueous solution of lignin sulfonate is an aqueous solution of sodium salt or calcium salt.

[0009] In one embodiment of the present invention, a water-based coating composition containing lignin is provided, wherein the thickener is a polyurethane rheology modifier, a polyether rheology modifier, an acrylic rheology modifier, a cellulose thickener, or a combination thereof.

[0010] In one embodiment of the present invention, a water-based coating composition containing lignin is provided, wherein the dispersant is an ammonium polyacrylate dispersant, a sodium polyacrylate dispersant, or a combination thereof.

[0011] In one embodiment of the present invention, a water-based coating composition containing lignin is provided, wherein the film-forming aid is ester alcohol dodecyl.

[0012] In one embodiment of the present invention, a water-based coating composition containing lignin is provided, wherein the defoamer is an organosilicone defoamer, a mineral oil defoamer, or a combination thereof.

[0013] In one embodiment of the present invention, a water-based coating composition containing lignin is provided, wherein the preservative is 1,2-benzisothiazolin-3-one, 2-methylisothiazolin-3-one, or a combination thereof.

[0014] In one embodiment of the present invention, a water-based coating composition containing lignin is provided, wherein the pH adjuster is an organic alcohol amine neutralizer.

[0015] In one embodiment of the present invention, a method for manufacturing a lignin-containing aqueous coating composition as described above is provided, comprising the following steps: a matrix mixing step, wherein the thickener is added to the deionized water and mixed evenly, and then the dispersant and the defoamer are added and mixed evenly to obtain a first solution; a pigment and filler mixing step, wherein the pigment and filler are added to the first solution and mixed evenly to obtain a second solution; a film-forming substance mixing step, wherein the acrylic copolymer solution is added to the second solution and mixed evenly, and then the lignin sulfonate aqueous solution is added and mixed evenly to obtain a third solution; and a coating additive mixing step, wherein the film-forming additive, the defoamer, the preservative and the pH adjuster are added to the third solution to obtain the lignin-containing aqueous coating composition.

[0016] In one embodiment of the present invention, a coating is provided using the lignin-containing waterborne coating composition as described above, which is formed by uniformly mixing the lignin-containing waterborne coating composition with an isocyanate resin and then coating it.

[0017] The present invention provides a method for manufacturing a water-based coating composition containing lignin, and the water-based coating composition prepared by the method provides a coating with good anti-fouling ability and easy cleaning properties. Simple Explanation of the Diagram

[0018] [Figure 1] is a flowchart showing a method for manufacturing a lignin-containing waterborne coating composition according to an embodiment of the present invention. Implementation

[0019] The following describes embodiments of the present invention. This description is not intended to limit the embodiments of the present invention, but rather to illustrate one example of the present invention.

[0020] According to an embodiment of the present invention, a lignin-containing aqueous coating composition comprises: 35 to 45 weight percent of a film-forming substance; 35 to 45 weight percent of pigments and fillers; 5 to 15 weight percent of coating additives; and 5 to 20 weight percent of deionized water, wherein the film-forming substance comprises an acrylic copolymer solution and an aqueous solution of lignin sulfonate, the pigments and fillers include titanium dioxide, kaolin, talc and calcium carbonate, and the coating additives include thickeners, dispersants, film-forming aids, defoamers, preservatives and pH adjusters.

[0021] Based on the above composition, lignin can be used to modify the water-based coating composition, so that the lignin fills the voids in the coating formed by the water-based coating composition, thereby forming a coating with good stain resistance and easy cleaning properties.

[0022] Lignin is a byproduct of the papermaking industry. It is inexpensive and has a stable source. Currently, the main method of disposal is combustion to generate heat energy.

[0023] Using the methods described above to modify water-based coatings can greatly contribute to energy conservation and carbon reduction.

[0024] According to an embodiment of the present invention, a lignin-containing aqueous coating composition is provided, wherein the acrylic copolymer solution is a pure acrylic copolymer or a styrene-acrylic copolymer solution.

[0025] According to an embodiment of the present invention, an aqueous coating composition containing lignin is provided, wherein the aqueous solution of lignin sulfonate is an aqueous solution of sodium salt or calcium salt.

[0026] According to an embodiment of the present invention, a lignin-containing aqueous coating composition is provided, wherein the thickener is a polyurethane rheology modifier, a polyether rheology modifier, an acrylic rheology modifier, a cellulose thickener, or a combination thereof.

[0027] According to an embodiment of the present invention, an aqueous coating composition containing lignin is provided, wherein the dispersant is an ammonium polyacrylate dispersant, a sodium polyacrylate dispersant, or a combination thereof.

[0028] According to an embodiment of the present invention, an aqueous coating composition containing lignin is provided, wherein the film-forming aid is ester alcohol dodecyl.

[0029] According to an embodiment of the present invention, a lignin-containing aqueous coating composition is provided, wherein the defoamer is an organosilicone defoamer, a mineral oil defoamer, or a combination thereof.

[0030] According to an embodiment of the present invention, a lignin-containing aqueous coating composition is provided, wherein the preservative is 1,2-benzisothiazolin-3-one, 2-methylisothiazolin-3-one, or a combination thereof.

[0031] According to an embodiment of the present invention, a lignin-containing aqueous coating composition is provided, wherein the pH adjuster is an organic alcohol amine neutralizer.

[0032] As shown in Figure 1, a method for manufacturing a lignin-containing aqueous coating composition according to an embodiment of the present invention includes the following steps: a matrix mixing step, in which the thickener is added to the deionized water and mixed evenly, and then the dispersant and the defoamer are added and mixed evenly to obtain a first solution; a pigment and filler mixing step, in which the pigment and filler are added to the first solution and mixed evenly to obtain a second solution; a film-forming substance mixing step, in which the acrylic copolymer solution is added to the second solution and mixed evenly, and then the lignin sulfonate aqueous solution is added and mixed evenly to obtain a third solution; and a coating additive mixing step, in which the film-forming additive, the defoamer, the preservative and the pH adjuster are added to the third solution to obtain the lignin-containing aqueous coating composition.

[0033] According to an embodiment of the method for manufacturing a lignin-containing waterborne coating composition of the present invention, 10 g of waterborne thickener is first added to 100 mL of water and stirred until clear and transparent. Then, 5 g of dispersant and 5 g of defoamer are added and stirred continuously at 800 RPM for 15 minutes to obtain a first solution. A suitable amount of wetting agent can also be added to the first solution.

[0034] Next, 45 g of titanium dioxide, 40 g of kaolin, 40 g of talc and 50 g of calcium carbonate were added to the first solution and stirred at 1500 RPM for 30 minutes to obtain the second solution.

[0035] Next, 100 g of aqueous acrylic copolymer emulsion was added to the second solution and stirred at 800 RPM for 10 minutes. After stirring, 65 g of lignin sulfonate aqueous solution was slowly added and stirred at 800 RPM for 10 minutes to obtain the third solution.

[0036] While stirring the obtained third solution at 800 RPM, 15 g of film-forming aid, 5 g of defoamer, 5 g of preservative and 5 g of pH adjuster were slowly added to obtain the water-based coating composition containing lignin.

[0037] The lignin-containing water-based coating composition obtained by the manufacturing method of the present invention can fill the pores formed in the coating when the water-based coating composition is applied to the surface of an object, thereby making it difficult for stains to adhere to the coating.

[0038] According to an embodiment of the present invention, a coating of a lignin-containing waterborne coating composition is formed by uniformly mixing the lignin-containing waterborne coating composition with an isocyanate resin and then applying the mixture.

[0039] By mixing this lignin-containing water-based coating composition with isocyanate resin, the hardening ability of the coating can be improved, resulting in a coating with high protective power and resistance to stains.

[0040] As mentioned above, the present invention provides a method for manufacturing a water-based coating composition containing lignin, and the water-based coating composition prepared by the method provides a coating with good stain resistance and easy cleaning properties.

[0041] The above description and explanation are merely illustrative of preferred embodiments of the present invention. Those skilled in the art may make other modifications based on the following defined scope of the patent application and the above description, but such modifications should still be within the spirit of the invention and the scope of the invention.

[0042] S1: Matrix mixing step S2: Pigment and filler mixing steps S3: Film-forming substance mixing step S4: Coating Additives Mixing Steps

Claims

1. A coating of a lignin-containing waterborne coating composition, formed by uniformly mixing the lignin-containing waterborne coating composition with an isocyanate resin and then coating it, wherein the lignin-containing waterborne coating composition comprises: 35 to 45 weight percent of a film-forming substance; 35 to 45 weight percent of pigments and fillers; 5 to 15 weight percent of coating additives; and 5 to 20 weight percent of deionized water, wherein the film-forming substance comprises an acrylic copolymer solution and an aqueous solution of lignin sulfonate, the pigments and fillers comprise titanium dioxide, kaolin, talc, and calcium carbonate, and the coating additives comprise thickeners, dispersants, film-forming aids, defoamers, preservatives, and pH adjusters.

2. The coating as claimed in claim 1, wherein the acrylic copolymer solution is a pure acrylic polymer or a styrene-acrylic copolymer solution.

3. The coating as claimed in claim 1, wherein the aqueous lignin sulfonate solution is an aqueous sodium salt solution or an aqueous calcium salt solution.

4. The coating as claimed in claim 1, wherein the thickener is a polyurethane rheology modifier, a polyether rheology modifier, an acrylic rheology modifier, a cellulose thickener, or a combination thereof.

5. The coating as claimed in claim 1, wherein the dispersant is an ammonium polyacrylate dispersant, a sodium polyacrylate dispersant, or a combination thereof.

6. The coating as claimed in claim 1, wherein the film-forming aid is ester alcohol dodecyl.

7. The coating as claimed in claim 1, wherein the defoamer is an organosilicone defoamer, a mineral oil defoamer, or a combination thereof.

8. The coating as claimed in claim 1, wherein the corrosion inhibitor is 1,2-benzisothiazolin-3-one, 2-methylisothiazolin-3-one, or a combination thereof.

9. The coating as claimed in claim 1, wherein the pH adjuster is an organic alcohol amine neutralizer.

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