CN102690589A - Aqueous dispersed alkyd blend colored paint and preparation method thereof - Google Patents

Abstract

The invention discloses aqueous dispersed alkyd blend colored paint and a preparation method thereof. The aqueous dispersed alkyd blend colored paint is made of, by weight, 40%-46% of alkyd resin, 2%-6% of petroleum resin, 10%-28% of color filler, 0.3%-0.8% of defoaming agent, 0.4%-0.8% of organic clay, 0.3%-0.6% of wetting agent, 0.5%-1% of drier, 0.1%-0.3% of anti-skinning agent, 20%-35% of cosolvent and 5%-10% of organic solvent. The aqueous dispersed alkyd blend colored paint is fresh and natural in smell and has excellent gloss, bonding force, flexibility, water resistance, corrosion resistance and outdoor durability.

Description

A kind of water dispersible alkyd blend color paint and preparation method thereof

technical field

The invention relates to the field of coatings, in particular to a water-dispersible alkyd blend paint and a preparation method thereof.

Background technique

Alkyd resin is the most important resin for coatings, and it is also the largest and earliest synthetic resin used in the coatings industry. Most of the alkyd resins currently on trial are solvent-based resins, which are the main source of volatile organic compounds (VOC). With the gradual improvement of people's environmental requirements, countries have put forward strict restrictions on the content of VOC in coatings. Since water is non-toxic, odorless, non-flammable and cheap, introducing water into the paint can not only reduce the production cost, but also greatly reduce the VOC content.

There are currently three methods of introducing water into an alkyd paint to form a dispersion:

1. Make the traditional alkyd resin contain excessive carboxyl groups, and neutralize it with amine or ammonia to form a salt to obtain a water-dilutable alkyd resin;

The disadvantages of this approach are: ① there is a large amount of organic solvents; ② the triethylamine used is now restricted in the coating industry; ③ the ortho effect of phthalic acid makes the resin not resistant to hydrolysis.

2. To prepare self-emulsifying alkyd resin, one method is to prepare an acrylic modified alkyd resin with a core-shell structure, the hydrophobic alkyd resin part is used as the core of the latex particle, and the hydrophilic acrylic acid copolymer part is used as the shell. The hydrophobic core is wrapped in the middle of the hydrophilic shell; another method is to react the alkyd resin with a reactive surfactant, so that the surfactant is grafted onto the alkyd resin, so that the alkyd resin can be emulsified in water , it overcomes the decrease of hardness and hydrophobicity caused by adding a large amount of emulsifier;

The disadvantages of this method are ①low emulsification efficiency; ②some resins need to be neutralized with neutralizers such as amine (or ammonia); ③low solid content of the emulsion.

3. Phase inversion and emulsification of solvent-based alkyd resin into alkyd resin emulsion dispersion by adding surfactant.

The first and second methods improve their compatibility with water by making the alkyd resin water-based, but the process is complicated and the cost is greatly increased, so they are not suitable for industrial production. The third method undoubtedly has good economic and social benefits, and is simple and easy to implement.

CN 101333405A discloses a method for adding water solvent to solvent-based alkyd resin paint, which includes the following steps: a. Select alkyd resin in proportion and add it to the container; b. Add additives and water according to the ratio under stirring at /min speed, and stir for 20-30 minutes; c. Add pigments and fillers in proportion, continue stirring for 10-20 minutes, and control the temperature below 50°C for grinding to reach the required fineness d. Add the original alkyd resin paint and 200# gasoline in proportion, continue to stir for 20 minutes, and check the package.

The problems of alkyd resin paint after adding water solvent are: (1) Slow water volatilization and difficult drying; (2) Complicated preparation, difficult to wet and disperse pigments; (3) Easy to cause substrate corrosion and influence on humidity (4) The dryness of the film is slow, and the hardness is poor, and the storage stability is relatively poor.

Contents of the invention

The object of the present invention is to propose an economical and simple water-dispersible alkyd blend color paint in order to overcome the problems of slow film-forming and poor hardness after adding a solvent to the solvent-based alkyd resin paint.

The purpose of the present invention can adopt the scheme realization of following technology:

A water-dispersible alkyd blended color paint, which contains the following components by weight percentage: 40%-46% alkyd resin, 2%-6% petroleum resin, 10%-28 % pigments and fillers, 0.3%-0.8% defoamer, 0.4%-0.8% organic clay, 0.3%-0.6% wetting agent, 0.5%-1% drier, 0.1%-0.3% anti-skinning agent, 20% %-35% co-solvent and 5%-10% organic solvent.

The above-mentioned alkyd resin is preferably medium-oil alkyd resin; the above-mentioned petroleum resin is preferably C9 petroleum resin, and the addition of C9 petroleum resin can significantly improve the gloss and adhesion of the alkyd resin paint, and significantly improve the hardness of the paint film.

The pigments and fillers include an extender pigment and a colored pigment, and the described extender pigment is any two or all of superfine calcium carbonate, precipitated barium sulfate and talcum powder; the colored pigment is selected from rutile titanium dioxide, medium chrome yellow, easy Any one or more of loose iron blue, phthalocyanine blue, phthalocyanine green, iron oxide red, iron oxide yellow, iron oxide black, and medium pigment carbon black.

The weight ratio of the extender pigment to the color pigment is 1-6:1.

The cosolvent is a water-based auxiliary agent, and the water-based auxiliary agent is a water-based auxiliary agent for a one-component solvent-based silver powder paint disclosed in the patent CN 101230217A, which is a kind of auxiliary agent developed by Jiangsu Champion Paint Industry Co., Ltd. , It is prepared by the following weight ratio: sodium alkylsulfonate anionic surfactant 1%-2%, water-based dispersant 0.1%-0.2%, water-based preservative 0.5%-1%, and the rest is water. The advantages of this co-solvent are: ① The required raw materials are readily available and cheap; ② The preparation is simple; ③ It is an environmentally friendly product; ④ It does not affect the original performance of the paint. This co-solvent can significantly reduce the amount of organic solvents used, thereby reducing the VOC content.

The organic solvent is any one or more of 200# gasoline, mixed trimethylbenzene, 1500# solvent oil or aromatic hydrocarbon solvent oil S-1000#.

The organoclay is 160 organobentonite.

The defoamer is BYK141 or BYK052, the wetting agent is BYK104S, and the drier is V-668.

The above-mentioned water-dispersible alkyd blending color paint, it is to adopt the following steps to prepare:

(1) First add alkyd resin and some organic solvents, start stirring, then add pigments and fillers, wetting agents, defoamers, and organoclay in sequence and stir evenly;

(2) Inhale the mixture obtained in step (1) into a sand mill for sand grinding until the fineness is less than 35 microns;

(3) Then add petroleum resin, co-solvent, and drier under stirring conditions, and adjust the viscosity to 130-200 with the remaining organic solvent, and stir evenly; the viscosity is 160-200s from April to October, and 130-160s from November to March (Tu-4 cups, 25°C).

(4) Add anti-skinning agent and stir evenly, then pass through a 200-mesh sieve.

The preparation method of above-mentioned water-dispersible alkyd blending paint, it is to comprise the following steps preparation:

(1) First add alkyd resin and some organic solvents, start stirring, then add pigments and fillers, wetting agents, defoamers, and organoclay in sequence and stir evenly;

(2) Inhale the mixture obtained in step (1) into a sand mill for sand grinding until the fineness is less than 35 microns;

(3) Then add petroleum resin, co-solvent, and drier under stirring conditions, and adjust the viscosity to 130-200 with the remaining organic solvent, and stir evenly; the viscosity is 160-200s from April to October, and 130-160s from November to March (Tu-4 cups, 25°C).

(4) Add anti-skinning agent and stir evenly, then pass through a 200-mesh sieve.

Beneficial effects of the present invention:

The water-dispersible alkyd blended color paint of the invention can be used as a protective paint for metal substrates. The paint can be used alone as a base-surface-in-one paint, or can be used in conjunction with a water-based top paint or a solvent-based top paint. Suitable for protective finishing of metal substrates in industrial facilities, equipment and residential products. It can be applied by flood coating, dip coating, conventional air spraying, high pressure airless spraying and other methods. It has the characteristics of fast drying and good protection performance, and further has the following advantages: (1) water-based additives are used as co-solvents, and the content of volatile organic compounds is low; (2) it is not easy to burn, which is conducive to safe production; (3) small smell, Low toxicity, which helps to improve the construction environment and personal health; (4) High thickness of one-time dipping paint film; (5) Excellent binding force, water resistance, corrosion resistance and outdoor durability; (6) Excellent Good flexibility.

The water-dispersible alkyd blend paint of the present invention has been compared with the solvent-based alkyd paint in various aspects, and the results are shown in Table 1. It can be seen that the water-dispersible alkyd blend paint of the present invention has a fresh smell , Natural, significantly better than solvent-based alkyd paint, free formaldehyde and volatile organic content are also significantly lower than solvent-based alkyd paint, superior environmental performance. In addition, it maintains the advantages of solvent-based alkyd paint in terms of other product performance and paint film performance.

Detailed ways

The present invention will be further described below in conjunction with specific examples, which should not be regarded as limiting the present invention.

Example 1

First add 42kg of medium-oil alkyd resin (Jiangsu Champion Paint Industry Co., Ltd.) and 4 kg of mixed trimethylbenzene, start stirring (300 rpm), then add 6 kg of iron oxide yellow, 3.3 kg of medium chrome yellow, and 0.8 kg of rutile titanium dioxide , 5 kg ultra-fine calcium carbonate, 5.5 kg precipitated barium sulfate, 0.35 kg BYK104S wetting agent, 0.5kg BYK141 defoamer, 0.6 kg 160 organic bentonite and accelerated stirring (900 rpm) for 15 min until evenly stirred (no powder on the edge of the pot) The material is attached, and there is no agglomeration in the pot);

Inhale the resulting mixture into a sand mill for sand grinding until the fineness is less than 35 microns;

Then start stirring (300 rpm) and add 5 kg C9 petroleum resin, 22 kg water-based additive (the water-based additive is the additive disclosed in Example 1 of the invention patent with the publication number CN 101230217A, Jiangsu Champion Paint Industry Co., Ltd.), 0.86 kg V-668 drier (Haifeng Chemical Auxiliary Co., Ltd., Haimen City, Jiangsu Province), and add 3.89 kg mixed trimethylbenzene to adjust the viscosity (160-200s (April-October), 130-160s (November-March)) (Paint -4 cups, 25°C), use color paste to color, stir for 30 minutes to check whether it is evenly stirred;

Add 0.2 kg of anti-skinning agent (Shanghai Changfeng Chemical Factory) and stir evenly, and pass the resulting paint solution through a 200-mesh sieve. Product performance testing is shown in Table 1.

Example 2

First add 44kg of medium-oil alkyd resin (Jiangsu Champion Paint Industry Co., Ltd.) and 4 kg of 200# gasoline, start stirring (300 rpm), then add 0.64kg of phthalocyanine blue, 0.26kg of easily dispersible iron blue, and 3.5 kg of rutile titanium White powder, 6 kg superfine calcium carbonate, 6.5 kg precipitated barium sulfate, 0.35 kg BYK104S wetting agent, 0.5kg BYK052 defoamer, 0.6kg 160 organic bentonite and stir at an accelerated rate (900 rpm) for 15 min until uniform (no The powder is attached, and there is no agglomeration in the pot);

Inhale the resulting mixture into a sand mill for sand grinding until the fineness is less than 35 microns;

Then start stirring (300 rpm) and add 5 kg C9 petroleum resin, 22.94 kg water-based additive (the water-based additive is the additive disclosed in Example 1 of the invention patent with the publication number CN 101230217A, Jiangsu Champion Paint Industry Co., Ltd.), 0.86 kgV-668 drier (Haifeng Chemical Auxiliary Co., Ltd., Haimen City, Jiangsu Province), and add 4.65kg 200# gasoline to adjust the viscosity (160-200 (April-October), 130-160 (November-March)) ( Paint -4 cups, 25°C), color with color paste, stir for 30 minutes to check whether it is evenly stirred;

Add 0.2 kg of anti-skinning agent (Shanghai Changfeng Chemical Factory Changfeng Chemical) and stir evenly, and pass the resulting paint solution through a 200-mesh sieve. Product performance testing is shown in Table 1.

Example 3

First add 46 kg of medium-oil alkyd resin (Jiangsu Champion Paint Industry Co., Ltd.) and 4kg of aromatic solvent oil S-1000#, start stirring (300 rpm), then add 4.74 kg of medium-pigment carbon black N234, 5.5 kg of ultra-fine carbonic acid Calcium, 6 kg of precipitated barium sulfate, 0.35 kg of BYK104S wetting agent, 0.5 kg of BYK052 defoamer, 0.6 kg of 160 organic bentonite and accelerated stirring (900 rpm) for 15 min until evenly stirred (no powder adhered to the edge of the pot, no into agglomerates);

Inhale the resulting mixture into a sand mill for sand grinding until the fineness is less than 35 microns;

Then start stirring (300 rpm) and add 5 kg C9 petroleum resin liquid, 22 kg water-based additive (the water-based additive is the additive disclosed in Example 1 of the invention patent with the publication number CN 101230217A, Jiangsu Champion Paint Industry Co., Ltd.), 0.94 kg V-668 drier (Haifeng Chemical Auxiliary Co., Ltd., Haimen City, Jiangsu Province), and add 4.17 kg aromatic solvent oil S-1000# to adjust the viscosity (160-200 (April-October), 130-160 (11 -March)) (coat -4 cups, 25°C), color with color paste, stir for 30 minutes to check whether it is evenly stirred;

Add 0.2 kg of anti-skinning agent (Shanghai Changfeng Chemical Factory Changfeng Chemical) and stir evenly, and pass the resulting paint solution through a 200-mesh sieve. Product performance testing is shown in Table 1.

Table 1 is the detection result of each example of the present invention and the contrast of solvent type

Table 1 Performance comparison between blended color paint of the present invention and solvent-based alkyd paint

Claims (9)

1. A water-dispersible alkyd blending paint, characterized in that by weight percentage, the blending paint comprises the following components: 40%-46% alkyd resin, 2%-6% petroleum resin , 10%-28% pigments and fillers, 0.3%-0.8% defoamer, 0.4%-0.8% organic clay, 0.3%-0.6% wetting agent, 0.5%-1% drier, 0.1%-0.3% Skinning agent, 20%-35% co-solvent and 5%-10% organic solvent. 2. The water-dispersible alkyd blending color paint according to claim 1, wherein said pigment and filler comprise extender pigment and colored pigment, and said extender pigment is superfine calcium carbonate, precipitated barium sulfate and talcum Any two or all of the powders; the coloring pigment is selected from rutile titanium dioxide, medium chrome yellow, easy dispersible iron blue, phthalocyanine blue, phthalocyanine green, iron oxide red, iron oxide yellow, iron oxide black, medium pigment carbon Any one or more of black. 3. The water-dispersible alkyd blended paint according to claim 2, wherein the weight ratio of the extender pigment and the coloring pigment is 1 to 6:1. 4. The water-dispersible alkyd blend color paint according to claim 1, characterized in that the co-solvent is a water-based co-agent. 5. The water-dispersible alkyd blending paint according to claim 1, characterized in that said alkyd resin is medium oil alkyd resin; said petroleum resin is C9 petroleum resin; said organic solvent It is any one or more of 200# gasoline, mixed trimethylbenzene, 1500# solvent oil or aromatic hydrocarbon solvent oil S-1000#. 6. The water-dispersible alkyd blend color paint according to claim 1, characterized in that the organoclay is 160 organobentonite. 7. The water-dispersible alkyd blended paint according to claim 1, characterized in that the defoamer is BYK141 or BYK052, the wetting agent is BYK104S, and the drier is V -668. 8. The water-dispersible alkyd blended paint according to claim 1, characterized in that it is prepared by the following steps: (1) First add alkyd resin and some organic solvents, start stirring, then add pigments and fillers, wetting agents, defoamers, and organoclay in sequence and stir evenly; (2) Inhale the mixture obtained in step (1) into a sand mill for sand grinding until the fineness is less than 35 microns; (3) Then add petroleum resin, co-solvent, and drier under stirring conditions, and adjust the viscosity to 130-200 with the remaining organic solvent, and stir evenly; (4) Add anti-skinning agent and stir evenly, then pass through a 200-mesh sieve. 9. The preparation method of the water-dispersible alkyd blended paint as claimed in claim 1, characterized in that it comprises the following steps of preparation: (1) First add alkyd resin and some organic solvents, start stirring, then add pigments and fillers, wetting agents, defoamers, and organoclay in sequence and stir evenly; (2) Inhale the mixture obtained in step (1) into a sand mill for sand grinding until the fineness is less than 35 microns; (3) Then add petroleum resin, co-solvent, and drier under stirring conditions, and adjust the viscosity to 130-200 with the remaining organic solvent, and stir evenly; (4) Add anti-skinning agent and stir evenly, then pass through a 200-mesh sieve.