CN108178945B

CN108178945B - Application of D-erythorbic acid and/or salt thereof in coating, antioxidant coating and preparation method thereof

Info

Publication number: CN108178945B
Application number: CN201711471088.5A
Authority: CN
Inventors: 闫世梁; 任柯; 张抗; 史小利; 刘银霞; 张生克; 肖媛; 苟丽莉; 曹晓伟; 崔凤霞; 曹琳青; 龚舒; 李月番; 王敬臣; 秦天苍
Original assignee: Zhengzhou Tuoyang Biological Engineering Co ltd
Current assignee: Zhengzhou Tuoyang Biological Engineering Co ltd
Priority date: 2017-12-28
Filing date: 2017-12-28
Publication date: 2021-02-09
Anticipated expiration: 2037-12-28
Also published as: CN108178945A

Abstract

The invention discloses application of D-erythorbic acid and/or salts thereof in a coating, an antioxidant coating and a preparation method thereof, and relates to the technical field of coatings. The invention discloses the application of D-isoascorbic acid and/or salt thereof as an antioxidant and a color fixative in paint; the invention also discloses an antioxidant coating and a preparation method thereof, wherein the antioxidant coating comprises an antioxidant, and the antioxidant comprises D-erythorbic acid and/or salt thereof. The invention alleviates the technical defects of weak oxidation resistance and easy aging of the existing coating. The D-isoascorbic acid and the salt thereof are used in the coating, so that the coating has excellent oxidation resistance and color protection effects, can keep the paint surface of the coating bright for a long time, can effectively slow down the aging phenomena of oxidation, fading, cracking, falling and the like of the coating, and is a food-grade antioxidant which is safe to use, non-toxic and pollution-free.

Description

Application of D-erythorbic acid and/or salt thereof in coating, antioxidant coating and preparation method thereof

Technical Field

The invention relates to the technical field of coatings, and particularly relates to an application of D-erythorbic acid and/or salts thereof in a coating, an antioxidant coating and a preparation method thereof.

Background

The ascorbic acid and the salt thereof are novel food anti-oxidation, anti-corrosion and preservative, can effectively reduce the oxidation of food, prevent the color, the fragrance and the taste of the food from fading, have the effect of contributing to the color of meat products and seafood, can inhibit the generation of carcinogenic nitrite in the food, and have the effects of reducing blood pressure, promoting urination and detoxifying in medicine. At present, the product is widely used in foods such as meat, fruits, beverages and the like. In recent years, the application of ascorbic acid as an antioxidant in fields such as wool spinning, electroplating, feed processing, industrial water treatment, petrochemical industry and the like is gradually expanded.

The paint is a chemical mixture material capable of being covered on the surface of object firmly to protect, decorate, mark and other special purpose, and the material may be painted onto the surface of object by different construction process to form firm and strong continuous solid film. The film thus formed is generally called a coating film, also called a paint film or a coating.

The article is exposed in the air and corroded by oxygen, moisture and the like to cause damages such as wood rot, metal corrosion, wall surface weathering and the like, and the surface of the article is coated with paint to form a protective film, so that the damage phenomena can be prevented or delayed, and the service life of various materials is prolonged. But the long-term exposure to air can easily cause the paint surface of the paint to be oxidized, discolored, cracked and even shed. The improvement of the oxidation resistance of the coating is an important factor for prolonging the protection function of the coating, so the improvement of the oxidation resistance of the coating is very important.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

One of the objects of the present invention is to provide the use of D-erythorbic acid and/or a salt thereof as an antioxidant and a color fixative in a coating, and the use of D-erythorbic acid and/or a salt thereof as an antioxidant in a coating can significantly improve the antioxidant ability of the coating.

The invention also aims to provide an antioxidant coating containing D-erythorbic acid and/or salts thereof, which can generate good antioxidant and color-protecting effects on the coating and relieve the aging phenomenon by adding the D-erythorbic acid and/or the salts thereof.

The invention also aims to provide a preparation method of the antioxidant coating, which has simple preparation process and does not have adverse effect on the stability of the coating product.

In order to achieve the above purpose of the present invention, the following technical solutions are adopted:

in a first aspect, the present invention provides the use of D-erythorbic acid and/or a salt thereof as an antioxidant and a colour fixative in coatings.

Preferably, on the basis of the technical scheme provided by the invention, the content of the D-isoascorbic acid and/or the salt thereof in the coating is 0.1-5 wt%, preferably 0.1-2 wt%, and further preferably 0.1-0.5 wt%.

Preferably, on the basis of the technical scheme provided by the invention, the salt comprises one or at least two of sodium salt, potassium salt or calcium salt, and preferably sodium salt.

Preferably, on the basis of the technical scheme provided by the invention, the coating is wood paint, metal paint or wall paint.

In a second aspect, the present invention provides an antioxidant coating comprising an antioxidant comprising D-erythorbic acid and/or a salt thereof.

Preferably, on the basis of the technical scheme provided by the invention, the content of the D-isoascorbic acid and/or the salt thereof in the antioxidant coating is 0.1-5 wt%, preferably 0.1-2 wt%, and further preferably 0.1-0.5 wt%.

Preferably, on the basis of the technical scheme provided by the invention, the salt comprises one or at least two of sodium salt, potassium salt or calcium salt, preferably sodium salt;

preferably, the antioxidant coating is wood paint, metal paint or wall paint.

Preferably, on the basis of the technical scheme provided by the invention, the antioxidant coating comprises the following components in percentage by mass: 20-50% of high-molecular emulsion, 20-50% of solvent, 0.1-5% of antioxidant, 0.2-2% of dispersant, 0.1-0.5% of wetting agent, 0.05-0.5% of defoaming agent, 0.1-0.5% of preservative, 2-20% of pigment, 0.5-1% of film-forming additive and 0.2-1% of thickening agent;

the high-molecular emulsion comprises aqueous polyurethane resin, styrene-acrylic emulsion, butylbenzene emulsion and pure acrylic emulsion, wherein the mass ratio of the aqueous polyurethane resin to the styrene-acrylic emulsion to the butylbenzene emulsion to the pure acrylic emulsion is 1: (0.5-1): (0.5-1): (1-1.5);

preferably, the antioxidant coating comprises the following components in percentage by mass: 30-50% of high molecular emulsion, 25-50% of solvent, 0.1-2% of antioxidant, 0.2-2% of dispersant, 0.1-0.5% of wetting agent, 0.05-0.5% of defoaming agent, 0.1-0.5% of preservative, 2-20% of pigment, 0.5-1% of film-forming additive and 0.2-1% of thickening agent;

further preferably, the antioxidant coating comprises the following components in percentage by mass: 30-50% of high molecular emulsion, 25-50% of solvent, 0.1-0.5% of antioxidant, 0.2-1% of dispersant, 0.1-0.5% of wetting agent, 0.05-0.5% of defoaming agent, 0.1-0.5% of preservative, 2-20% of pigment, 0.5-1% of film-forming additive and 0.2-1% of thickening agent.

Preferably, on the basis of the technical scheme provided by the invention, the antioxidant also comprises plant modified polysaccharide, and the mass ratio of the plant modified polysaccharide to the D-erythorbic acid and/or the salt thereof is 1: (2-5);

preferably, the plant modified polysaccharide comprises modified cellulose and/or modified starch;

preferably, the modified cellulose comprises one or at least two of hydroxypropyl methyl cellulose, hydroxymethyl cellulose, sodium hydroxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, carboxyethyl cellulose or sodium carboxyethyl cellulose;

preferably, the modified starch comprises one or at least two of oxidized starch, hydroxymethyl starch, hydroxyethyl starch, hydroxypropyl starch, carboxymethyl starch, sodium carboxymethyl starch, carboxypropyl starch or sodium carboxypropyl starch;

preferably, the dispersing agent comprises one or at least two of vinyldistearamide, sodium stearate or magnesium stearate;

preferably, the wetting agent comprises one or at least two of wetting agent SF-1, wetting agent GRS-90 or wetting agent 104PG 50;

preferably, the defoaming agent comprises one or at least two of alkylphenol polyoxyethylene, polyvinyl alcohol or Tween;

preferably, the pigment comprises one or at least two of rutile titanium dioxide, carbon black, cobalt blue, molybdenum bismuth yellow or iron oxide red.

In a third aspect, the invention provides a preparation method of the antioxidant coating, which comprises the following steps:

and (3) uniformly mixing the antioxidant with other raw materials in the coating to obtain the antioxidant coating.

Compared with the prior art, the invention has the following beneficial effects:

(1) the D-isoascorbic acid and the salt thereof are used in the coating, so that the coating has excellent oxidation resistance and color protection effects, can keep the paint surface of the coating bright for a long time, can effectively slow down the aging phenomena of oxidation, fading, cracking, falling and the like of the coating, and is a food-grade antioxidant which is safe to use, non-toxic and pollution-free.

(2) The coating contains D-isoascorbic acid and/or salt thereof as an antioxidant, can generate good antioxidant and color protection effects on the coating, can keep the paint surface of the coating bright for a long time, and can effectively relieve a series of aging phenomena such as fading, discoloration, cracking, strength reduction and the like caused by the influence of external conditions such as sunlight irradiation, temperature change, wind, rain and the like on the coating, wherein the external conditions are caused by the influence of the external conditions on the coating. Compared with other chemical antioxidants, the antioxidant containing D-erythorbic acid is safer, nontoxic and pollution-free when being added.

(3) The preparation method of the invention is to mix the antioxidant containing D-erythorbic acid and/or salt thereof with other raw materials in the coating uniformly, the preparation process is simple to operate, and the stability of the coating product is not affected.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

According to a first aspect of the present invention there is provided the use of D-erythorbic acid and/or a salt thereof as an antioxidant and as a colour fixative in coatings.

The type and use of the coating are not limited, and the D-erythorbic acid and/or the salt thereof can be applied to various coatings, such as wood paint, metal paint or wall paint, and the like.

"D-erythorbic acid and/or a salt thereof" means D-erythorbic acid, or D-erythorbate salt, or a mixture of D-erythorbic acid and D-erythorbate salt.

D-Isoascorbic acid (D-isoascorbyl acid; D-2,3,5, 6-tetrahydroxy-2-hexenoic acid-gamma-lactone), also known as erythorbic acid, isovitamin C, formula C₆H₈O₆. It is an optical isomer of vitamin C and thus has chemical properties similar to vitamin C, and belongs to a water-soluble antioxidant.

Typical but non-limiting D-erythorbate salts are for example sodium D-erythorbate, potassium D-erythorbate or calcium D-erythorbate, etc., preferably sodium D-erythorbate.

The D-isoascorbic acid and the salt thereof are used in the paint, have excellent antioxidant and color protecting effects, can keep the paint surface of the paint bright for a long time, and effectively slow down the aging phenomena of oxidation, fading, cracking, falling off and the like of the paint. And the D-erythorbic acid and the salt thereof are food-grade antioxidants, and are safe, nontoxic and pollution-free.

In a preferred embodiment, the content of D-erythorbic acid and/or a salt thereof in the dope is 0.1 to 5% by weight, preferably 0.1 to 2% by weight, further preferably 0.1 to 0.5% by weight.

The content of D-erythorbic acid and/or a salt thereof is, for example, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5% by mass based on the coating material.

By adding 0.1-5 wt% of D-erythorbic acid and/or salt thereof into the coating, the oxidation resistance of the coating can be obviously improved, the addition amount is too small, the oxidation resistance and ageing resistance of the coating are not obvious, the ageing resistance of the coating can be reduced due to too much addition amount, and raw materials are wasted.

According to a second aspect of the present invention there is provided an antioxidant coating comprising an antioxidant comprising D-erythorbic acid and/or a salt thereof.

By "antioxidant comprises D-erythorbic acid and/or a salt thereof" is meant that the antioxidant comprises D-erythorbic acid, or the antioxidant comprises D-erythorbate salt, or the antioxidant comprises a mixture of D-erythorbic acid and D-erythorbate salt.

"the antioxidant includes D-erythorbic acid and/or a salt thereof" means that the antioxidant may include other antioxidants in addition to D-erythorbic acid and/or a salt thereof.

By "antioxidant coating includes an antioxidant" is meant that the coating includes, in addition to the antioxidant, other components, such as essential components of the coating, e.g., film-forming materials and the like.

The D-isoascorbic acid and/or the salt thereof are added into the coating, so that good oxidation resistance and color protection effects can be generated on the coating, the gloss of the paint surface of the coating can be kept for a long time, and a series of aging phenomena such as fading, discoloration, cracking, strength reduction and the like caused by the influence of external conditions such as sunlight irradiation, temperature change, wind blowing, rain and the like on the coating can be effectively relieved. Compared with other chemical antioxidants, the antioxidant containing D-erythorbic acid is safer, nontoxic and pollution-free when being added.

By adding 0.1-5 wt% of D-erythorbic acid and/or salt thereof into the coating, the oxidation resistance of the coating can be obviously improved, the addition amount is too small, the oxidation resistance and ageing resistance effects of the coating are not obvious, and the addition amount is too large, so that negative effects can be generated on the ageing resistance of the coating.

A typical antioxidant coating comprises the following components in percentage by mass: 20-50% of high-molecular emulsion, 20-50% of solvent, 0.1-5% of antioxidant, 0.2-2% of dispersant, 0.1-0.5% of wetting agent, 0.05-0.5% of defoaming agent, 0.1-0.5% of preservative, 2-20% of pigment, 0.5-1% of film-forming additive and 0.2-1% of thickening agent;

the high-molecular emulsion comprises aqueous polyurethane resin, styrene-acrylic emulsion, butylbenzene emulsion and pure acrylic emulsion, wherein the mass ratio of the aqueous polyurethane resin to the styrene-acrylic emulsion to the butylbenzene emulsion to the pure acrylic emulsion is 1: (0.5-1): (0.5-1): (1-1.5).

High molecular emulsion

The high polymer emulsion comprises aqueous polyurethane resin, styrene-acrylic emulsion, styrene-butadiene emulsion and pure acrylic emulsion, wherein the mass ratio of the aqueous polyurethane resin to the styrene-acrylic emulsion to the styrene-butadiene emulsion to the pure acrylic emulsion is 1: (0.5-1): (0.5-1): (1-1.5).

The aqueous polyurethane resin, the styrene-acrylic emulsion, the styrene-butadiene emulsion and the acrylic emulsion are not limited, and commercially available aqueous polyurethane resin, styrene-acrylic emulsion, styrene-butadiene emulsion and acrylic emulsion can be used. For example, the styrene-acrylic emulsion can be any one or a mixture of at least two of QSH-01 in the chemical industry, JR-61 in Basf or D T-75 in the aerospace technology. For example, the acrylic emulsion may be selected from any one or a mixture of at least two of 8556 from Rohm and Haas, BY-510TS from Nomick, RG-C20009 from Raymond, HRC-1 from Sangda, or BLJ-960 from Baulika.

The mass ratio of the aqueous polyurethane resin, the styrene-acrylic emulsion, the styrene-butadiene emulsion and the pure acrylic emulsion is typically, but not limited to, 1: 0.5: 0.5: 1. 1: 1: 1: 1. 1: 1: 0.5: 1 or 1: 1: 0.5: 1.5, etc.

The polymer emulsion is typically, but not limited to, in mass percent, e.g., 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, or 50%.

The coating with good comprehensive properties such as bonding strength and the like can be obtained by using the aqueous polyurethane resin, the styrene-acrylic emulsion, the styrene-butadiene emulsion and the pure acrylic emulsion in a matching way.

Solvent(s)

Typical solvents are for example water or ethanol-water mixed solutions.

Typical but non-limiting mass percent amounts of solvent are, for example, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, or 50%.

Antioxidant agent

The antioxidant comprises D-erythorbic acid and/or a salt thereof, and may further comprise other antioxidants.

Antioxidants are typically, but not limited to, present in a mass percent amount such as 0.1%, 0.2%, 0.4%, 0.6%, 0.8%, 1%, 2%, 3%, 4%, or 5%.

The anti-aging ability of the coating can be significantly improved by adding an antioxidant comprising D-erythorbic acid and/or a salt thereof.

Dispersing agent

Typical but non-limiting examples of dispersants are vinyldistearamide, sodium stearate or magnesium stearate, and the like.

Typical but not limiting mass percentages of dispersants are for example 0.2%, 0.4%, 0.6%, 0.8%, 1%, 1.5% or 2%.

The mixing speed of the coating can be increased by adopting the dispersing agent, and the preparation efficiency is improved.

Wetting agent

Wetting agents are typically, but not limited to, wetting agents SF-1, GRS-90, 104PG50, and the like.

Wetting agents are typically, but not limited to, present in an amount of, for example, 0.1%, 0.2%, 0.3%, 0.4% or 0.5% by mass.

The solubility of the resin emulsion during mixing is made better by the use of wetting agents.

Defoaming agent

Typical but non-limiting examples of defoamers are alkylphenol ethoxylates, polyvinyl alcohols or tweens, and the like.

Typical but not limiting mass percent amounts of antifoam are for example 0.05%, 0.1%, 0.2%, 0.3%, 0.4% or 0.5%.

By adopting the defoaming agent, the foam breaking speed in the later period of the coating preparation process is accelerated, and the preparation efficiency is improved.

Preservative

A typical but non-limiting example of a preservative is preservative K55.

Typical but not limiting amounts of preservatives are for example 0.1%, 0.2%, 0.3%, 0.4% or 0.5% by mass.

Pigment (I)

Pigments are typically, but not limited to, rutile titanium dioxide, carbon black, cobalt blue, molybdenum bismuth yellow, or iron oxide red, among others.

Typical but non-limiting mass percent amounts of pigments are, for example, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 16%, 18%, or 20%.

Film forming aid

Typical but non-limiting film-forming aids are, for example, benzyl alcohol, ethylene glycol monobutyl ether, or dodecyl alcohol esters, and the like.

Typical but non-limiting amounts of coalescents are, for example, 0.5%, 0.6%, 0.7%, 0.8%, 0.9% or 1% by mass.

Thickening agent

Typical but non-limiting thickeners are for example the thickener HEC, synergistic thickeners or acrylic thickeners and the like.

Typical but not limiting amounts of thickeners are for example 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9% or 1% by mass.

By adopting the thickening agent, the rheological property, the precipitation and the storage of the coating are improved.

By "comprising" is meant that it may include, in addition to the recited components, other components that impart different characteristics to the coating. In addition, the term "comprising" as used herein may be replaced by "being" or "consisting of … …" as closed.

For example, the coating may also include other components such as fillers.

The typical coating adopts four emulsions of aqueous polyurethane resin, styrene-acrylic emulsion, styrene-butadiene emulsion and pure acrylic emulsion as film forming substances in a composite way, and D-isoascorbic acid and/or salt thereof is added as an antioxidant, so that the obtained coating has good ageing resistance and excellent comprehensive performance.

In a preferred embodiment, the antioxidant coating comprises the following components in percentage by mass: 30-50% of high molecular emulsion, 25-50% of solvent, 0.1-2% of antioxidant, 0.2-2% of dispersant, 0.1-0.5% of wetting agent, 0.05-0.5% of defoaming agent, 0.1-0.5% of preservative, 2-20% of pigment, 0.5-1% of film-forming additive and 0.2-1% of thickening agent.

In a preferred embodiment, the antioxidant coating comprises the following components in percentage by mass: 30-50% of high molecular emulsion, 25-50% of solvent, 0.1-0.5% of antioxidant, 0.2-1% of dispersant, 0.1-0.5% of wetting agent, 0.05-0.5% of defoaming agent, 0.1-0.5% of preservative, 2-20% of pigment, 0.5-1% of film-forming additive and 0.2-1% of thickening agent.

The comprehensive performance of the coating can be further improved by optimizing the component proportion of the coating.

In a preferred embodiment, the antioxidant further comprises a plant-modified polysaccharide, and the mass ratio of the plant-modified polysaccharide to the D-erythorbic acid and/or the salt thereof is 1: (2-5).

Preferably, the plant modified polysaccharide comprises modified cellulose and/or modified starch.

Typical but non-limiting examples of modified celluloses are hydroxypropyl methylcellulose, hydroxymethyl cellulose, sodium hydroxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, carboxyethyl cellulose, or sodium carboxyethyl cellulose, and the like.

Modified starches are typically, but not limited to, oxidized starch, hydroxymethyl starch, hydroxyethyl starch, hydroxypropyl starch, carboxymethyl starch, sodium carboxymethyl starch, carboxypropyl starch, sodium carboxypropyl starch, and the like.

The mass ratio of the plant-modified polysaccharide to the D-erythorbic acid and/or the salt thereof is, for example, 1: 2. 1: 3. 1: 4 or 1: 5.

the plant modified polysaccharide serving as a plant natural antioxidant is matched with D-erythorbic acid and/or salt thereof for use, so that the anti-aging performance of the coating can be further improved.

According to a third aspect of the present invention, there is provided a preparation method of the above antioxidant coating, comprising the steps of:

The coating can be prepared according to the conventional technology in the field, and then the antioxidant containing the D-erythorbic acid and/or the salt thereof is added into the coating and mixed evenly. The preparation process is simple to operate, and has no adverse effect on the stability of the coating product.

For further understanding of the present invention, the effects of the present invention will be described in further detail with reference to specific examples and comparative examples. All the raw materials related to the invention can be obtained commercially.

Example 1

An antioxidant interior wall engineering paint comprises the following components: 30% of solvent water, 0.5% of antifreeze agent ethylene glycol, 10.5% of dispersant AR, 10.1% of wetting agent SF, 990.1% of multifunctional auxiliary agent Codis, 8% of defoamer T-5030.1, 0.5% of antioxidant D-sodium erythorbate, 550.1% of preservative K, 3% of pigment anatase titanium dioxide, 6% of filler kaolin, 20% of filler heavy calcium (800 meshes), 10% of filler light calcium (1000 meshes), 8% of filler talcum powder (1250 meshes), 120.5% of film-forming auxiliary agent alcohol ester, 5030.1% of defoamer T-5030.1%, GC-659020% of styrene-acrylic emulsion and 0.5% of thickener MS-2(1:1 water).

Example 2

An antioxidant interior wall engineering paint comprises the following components: 20% of solvent water, 0.5% of antifreeze agent ethylene glycol, 10.5% of dispersant AR, 500.1% of wetting agent 104PG, 990.1% of multifunctional auxiliary agent Codis, 0.1% of defoamer Tween, 0.5% of antioxidant D-sodium erythorbate, 550.1% of preservative K, 3% of pigment cobalt blue, 6% of filler kaolin, 20% of filler heavy calcium (800 meshes), 10% of filler light calcium (1000 meshes), 8% of filler talcum powder (1250 meshes), 0.5% of film-forming auxiliary agent ethylene glycol monobutyl ether, 0.5% of defoamer T-5030.1, L-824230% of butylbenzene emulsion and 0.5% of thickener MS-2(1:1 water).

Example 3

An antioxidant interior wall engineering paint comprises the following components: 10% of solvent water, 0.5% of antifreeze agent ethylene glycol, 10.5% of dispersant AR, 10.5% of wetting agent GRS-900.1%, 990.1% of multifunctional auxiliary agent Codis, 0.1% of defoamer polyvinyl alcohol, 0.5% of antioxidant D-sodium erythorbate, 550.1% of preservative K, 3% of pigment carbon black, 6% of filler kaolin, 20% of filler heavy calcium (800 meshes), 10% of filler light calcium (1000 meshes), 8% of filler talcum powder (1250 meshes), 0.5% of film-forming auxiliary agent benzyl alcohol, 0.1% of defoamer Tween, 855640% of pure acrylic emulsion and 0.5% of thickener MS-2(1:1 water).

Example 4

An antioxidant water-based metallic paint comprises the following components: 2.7% of propylene glycol, 10.1% of wetting agent SF, 10.3% of dispersing agent AR, 5.2% of defoaming agent T-5030.05%, 0.35% of pigment titanium white, 0.2% of antioxidant D-isoascorbic acid, 0.32% of preservative K550.2%, 28.5% of ethanol, 16% of pearl powder, 0.15% of styrene-acrylic emulsion BASF JR-6145%, 121% of alcohol ester, 0.15% of flatting agent, 0.1% of synergistic thickening agent and 0.15% of acrylic thickening agent.

Example 5

An antioxidant water-based metallic paint comprises the following components: 1.7% of propylene glycol, 10.1% of wetting agent SF, 10.3% of dispersing agent AR, 5.2% of defoaming agent T-5030.05%, 0.35% of pigment titanium dioxide, 0.2% of antioxidant D-isoascorbic acid, 0.2% of preservative K550.2%, 28.5% of ethanol, 12% of pearl powder, 150% of HRC-of pure acrylic emulsion, 121% of alcohol ester, 0.15% of flatting agent, 0.1% of synergistic thickening agent and 0.15% of acrylic thickening agent.

Example 6

An antioxidant water-based metallic paint comprises the following components: 5.7 percent of propylene glycol, 10.1 percent of wetting agent SF, 10.3 percent of dispersing agent AR, 5.2 percent of defoaming agent T-5030.05 percent of water, 0.35 percent of pigment titanium dioxide, 0.2 percent of antioxidant D-isoascorbic acid, 0.32 percent of preservative K550.2 percent of ethanol, 30.5 percent of pearl powder, 40 percent of pure acrylic emulsion BY-510TS, 121 percent of alcohol ester, 0.15 percent of flatting agent, 0.1 percent of synergistic thickening agent and 0.15 percent of acrylic thickening agent.

Example 7

An antioxidant interior wall engineering paint comprises the following components: 30% of solvent water, 0.5% of antifreeze agent ethylene glycol, 10.5% of dispersant AR, 10.1% of wetting agent SF, 990.1% of multifunctional auxiliary agent Codis, 0.4% of defoamer T-5030.1, 0.1% of antioxidant D-sodium erythorbate, 0.1% of antioxidant sodium carboxymethylcellulose, 550.1% of preservative K, 3% of pigment anatase titanium dioxide, 6% of filler kaolin, 20% of filler calcium bicarbonate (800 meshes), 10% of filler light calcium (1000 meshes), 8% of filler talcum powder (1250 meshes), 120.5% of film-forming auxiliary agent alcohol ester, 5030.1% of defoamer T-5030.1%, GC-659020% of styrene-acrylic emulsion and 0.5% of thickener MS-2(1:1 water).

Unlike example 1, the antioxidant of this example further included sodium carboxymethylcellulose.

Example 8

An antioxidant water-based metallic paint comprises the following components: 2.7% of propylene glycol, 10.1% of wetting agent SF, 10.3% of dispersing agent AR, 5.2% of defoaming agent T-5030.05%, 0.35% of pigment titanium dioxide, 0.1% of antioxidant D-isoascorbic acid, 0.1% of antioxidant sodium carboxymethylcellulose, 550.2% of preservative K, 28.5% of ethanol, 16% of pearl powder, 6145% of styrene-acrylic emulsion BASF JR, 121% of alcohol ester, 0.15% of leveling agent, 0.1% of synergistic thickening agent and 0.15% of acrylic thickening agent.

Unlike example 4, the antioxidant of this example further included sodium carboxymethylcellulose.

Example 9

An antioxidant interior wall engineering paint is prepared by replacing 5% of waterborne polyurethane resin, 5% of styrene-acrylic emulsion GC-65905%, 5% of styrene-butadiene emulsion and 5% of pure acrylic emulsion with GC-659020% of styrene-acrylic emulsion, and the balance being the same as in example 1.

Example 10

An antioxidant aqueous metallic paint, wherein 10% of styrene-acrylic emulsion BASF JR-6145% is replaced by aqueous polyurethane resin, 10% of styrene-acrylic emulsion BASF JR-6110%, 10% of butylbenzene emulsion and 15% of pure acrylic emulsion, and the rest components are the same as in example 4.

Comparative examples 1 to 3

Comparative examples 1-3 differ from examples 1-3 in that the antioxidant sodium D-erythorbate was not included. Comparative examples 4 to 6

Comparative examples 4-6 differ from examples 4-6 in that the antioxidant D-erythorbic acid was not included.

Comparative example 7

An antioxidant interior wall engineering paint comprises the following components: 30% of solvent water, 0.5% of antifreeze agent ethylene glycol, 10.5% of dispersant AR, 10.1% of wetting agent SF, 990.1% of multifunctional auxiliary agent Codis, 8% of defoamer T-5030.1, 0.05% of antioxidant D-sodium erythorbate, 550.1% of preservative K, 3% of pigment anatase titanium dioxide, 6% of filler kaolin, 20% of filler heavy calcium (800 meshes), 10% of filler light calcium (1000 meshes), 8% of filler talcum powder (1250 meshes), 120.5% of film-forming auxiliary agent alcohol ester, 5030.1% of defoamer T-5030.1%, GC-659020% of styrene-acrylic emulsion and 0.95% of thickener MS-2(1:1 water).

In contrast to example 1, the antioxidant sodium D-erythorbate was present in an amount of 0.05%.

Comparative example 8

An antioxidant water-based metallic paint comprises the following components: 2.7% of propylene glycol, 10.1% of wetting agent SF, 10.3% of dispersing agent AR, 5.2% of defoaming agent T-5030.05%, 5.35% of water, 0.35% of pigment titanium dioxide, 5.2% of antioxidant D-isoascorbic acid, preservative K550.2%, 28.5% of ethanol, 16% of pearl powder, 0.15% of styrene-acrylic emulsion BASF JR-6140%, 121% of alcohol ester, 0.15% of flatting agent, 0.1% of synergistic thickening agent and 0.15% of acrylic thickening agent.

Different from example 4, the content of antioxidant D-erythorbic acid was 5.2%.

Test examples

The coatings obtained in examples 1 to 10 and comparative examples 1 to 8 were subjected to an aging test and a conventional test.

Aging resistance test: the prepared standard test plate coated with the coating is placed in a test box, a xenon arc lamp filtered by a filter is used as a radiation source, the artificial climate accelerated aging of the coating is carried out by simulating natural conditions, and finally, the aging result of the sample plate is evaluated, and the result is shown in table 1.

And (3) conventional testing: the results are shown in Table 2, using national standards.

TABLE 1

As can be seen from Table 1, the coating of the examples of the present invention has excellent aging resistance, low gloss reduction, and low discoloration and chalking. Therefore, the addition of the D-isoascorbic acid and the salt thereof can keep the paint surface of the paint bright for a long time and effectively slow down the aging phenomena of oxidation, fading, cracking, falling off and the like of the paint.

In example 7, as compared with example 1, and in example 8, as compared with example 4, the aging resistance of examples 7 and 8 was found to be better than that of examples 1 and 4, and it was found that the synergistic effect of sodium hydroxymethylcellulose and D-erythorbic acid (salt) could provide better aging resistance.

Comparative examples 1-3 compared to examples 1-3, contained no sodium D-erythorbate; comparative examples 4-6 did not contain D-erythorbic acid and the coatings were inferior in aging resistance to examples 4-6. In comparative example 7, the content of sodium D-erythorbate was lower than that in example 1, and in comparative example 8, the content of D-erythorbic acid was higher than that in example 4, and the aging resistance was not as good as that in example 4, and therefore, it was found that the addition amount of D-erythorbic acid (salt) had some influence on the aging resistance of the coating material, and that neither too high nor too low of the addition amount could achieve a good level.

TABLE 2

As can be seen from Table 2, the coatings of examples 1-10 have better comprehensive properties, and further analysis shows that, compared with example 1 and example 9, compared with example 4 and example 10, the coatings of examples 9 and 10 have better comprehensive properties, and the coating obtained by compounding the aqueous polyurethane resin, the styrene-acrylic emulsion, the styrene-butadiene emulsion and the acrylic emulsion has better comprehensive properties.

While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.

Claims

1. The anti-oxidation coating is characterized by comprising the following components in percentage by mass: 20-50% of high-molecular emulsion, 20-50% of solvent, 0.1-5% of antioxidant, 0.2-2% of dispersant, 0.1-0.5% of wetting agent, 0.05-0.5% of defoaming agent, 0.1-0.5% of preservative, 2-20% of pigment, 0.5-1% of film-forming additive and 0.2-1% of thickening agent;

the antioxidant comprises D-erythorbic acid and/or a salt thereof; the antioxidant also comprises plant modified polysaccharide, and the mass ratio of the plant modified polysaccharide to the D-erythorbic acid and/or the salt thereof is 1: (2-5);

the plant modified polysaccharide comprises modified cellulose and/or modified starch.

2. The antioxidant coating of claim 1, wherein the antioxidant coating is a wood lacquer, a metal lacquer or a wall finish.

3. The antioxidant coating as claimed in claim 1, wherein the antioxidant coating comprises the following components by mass percent: 30-50% of high molecular emulsion, 25-50% of solvent, 0.1-2% of antioxidant, 0.2-2% of dispersant, 0.1-0.5% of wetting agent, 0.05-0.5% of defoaming agent, 0.1-0.5% of preservative, 2-20% of pigment, 0.5-1% of film-forming additive and 0.2-1% of thickening agent.

4. The antioxidant coating as claimed in claim 1, wherein the antioxidant coating comprises the following components by mass percent: 30-50% of high molecular emulsion, 25-50% of solvent, 0.1-0.5% of antioxidant, 0.2-1% of dispersant, 0.1-0.5% of wetting agent, 0.05-0.5% of defoaming agent, 0.1-0.5% of preservative, 2-20% of pigment, 0.5-1% of film-forming additive and 0.2-1% of thickening agent.

5. The oxidation resistant coating of claim 1 wherein said modified cellulose comprises one or at least two of hydroxypropyl methylcellulose, hydroxymethyl cellulose, sodium hydroxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, carboxyethyl cellulose, or sodium carboxyethyl cellulose.

6. The oxidation resistant coating of claim 1 wherein said modified starch comprises one or at least two of hydroxymethyl starch, hydroxyethyl starch, hydroxypropyl starch, carboxymethyl starch, sodium carboxymethyl starch, carboxypropyl starch, or sodium carboxypropyl starch.

7. The antioxidant coating of claim 1, wherein the dispersant comprises one or at least two of vinyldistearamide, sodium stearate or magnesium stearate.

8. The oxidation resistant coating of claim 1 wherein the wetting agent comprises one or at least two of the wetting agents SF-1, GRS-90, or 104PG 50.

9. The antioxidant coating material as claimed in claim 1, wherein the defoaming agent comprises one or at least two of alkylphenol ethoxylates, polyvinyl alcohol or tween.

10. The oxidation resistant coating composition of claim 1, wherein the pigment comprises one or at least two of rutile titanium dioxide, carbon black, cobalt blue, molybdenum bismuth yellow, or red iron oxide.

11. A method for preparing an oxidation resistant coating according to any one of claims 1 to 10, comprising the steps of: