阅读说明：本技术 一种用于铝扣板的水性石墨烯涂料及其制备方法 (Water-based graphene coating for aluminum gusset plate and preparation method thereof ) 是由 蒋炜 蔡铭 陈稳城 于 2019-10-14 设计创作，主要内容包括：本发明公开了一种用于铝扣板的水性石墨烯涂料及其制备方法。这种水性石墨烯涂料包括以下质量份的组分：水性聚碳酸酯树脂40～60份、水分散体乳液20～40份、功能化石墨烯0.1～1份、填料5～11份、颜料0～1.5份、润湿剂0.1～3份、防锈剂0.3～2份、消泡剂0.1～1份、增稠剂0.2～1份、分散剂0.1～0.5份、水3～10份。同时也公开了这种水性石墨烯涂料的制备方法。本发明提供的水性石墨烯涂料具有无VOC排放、适用性强、抗油污能力佳,耐水性优异、环保无污染,防腐时效长等优点,可以满足铝扣板表面涂装的使用要求。(The invention discloses a water-based graphene coating for an aluminous gusset plate and a preparation method thereof. The water-based graphene coating comprises the following components in parts by mass: 40-60 parts of water-based polycarbonate resin, 20-40 parts of aqueous dispersion emulsion, 0.1-1 part of functionalized graphene, 5-11 parts of filler, 0-1.5 parts of pigment, 0.1-3 parts of wetting agent, 0.3-2 parts of antirust agent, 0.1-1 part of defoaming agent, 0.2-1 part of thickening agent, 0.1-0.5 part of dispersing agent and 3-10 parts of water. Also discloses a preparation method of the water-based graphene coating. The water-based graphene coating provided by the invention has the advantages of no VOC (volatile organic compounds) emission, strong applicability, good oil stain resistance, excellent water resistance, environmental protection, no pollution, long corrosion resistance and aging resistance, and the like, and can meet the use requirements of the surface coating of the aluminum gusset plate.)

1. The utility model provides a water-based graphene coating for aluminous gusset plate which characterized in that: the paint comprises the following components in parts by mass: 40-60 parts of water-based polycarbonate resin, 20-40 parts of aqueous dispersion emulsion, 0.1-1 part of functionalized graphene, 5-11 parts of filler, 0-1.5 parts of pigment, 0.1-3 parts of wetting agent, 0.3-2 parts of antirust agent, 0.1-1 part of defoaming agent, 0.2-1 part of thickening agent, 0.1-0.5 part of dispersing agent and 3-10 parts of water;

the aqueous dispersion emulsion is a compound of modified styrene-acrylic emulsion and fluorinated modified acrylic emulsion;

the functionalized graphene is a compound of fluorinated graphene and silanization modified graphene.

2. The aqueous graphene coating for the aluminous gusset plate according to claim 1, wherein: in the aqueous dispersion emulsion, the mass ratio of the modified styrene-acrylic emulsion to the fluorinated modified acrylic emulsion is 1: (1-2).

3. The aqueous graphene coating for the aluminous gusset plate according to claim 1 or 2, wherein: the preparation method of the fluorinated modified acrylic emulsion comprises the following steps:

s1: mixing 1-3 parts by mass of an anionic surfactant, 1-3 parts by mass of an emulsifier and 180-220 parts by mass of water to prepare an emulsifier solution;

s2: mixing 15-20 parts by mass of perfluorooctyl ethyl methacrylate, 45-55 parts by mass of butyl methacrylate and 2-4 parts by mass of methacrylic acid, mixing with 80-120 parts by mass of an emulsifier solution, and performing ultrasonic emulsification to obtain a monomer pre-emulsion;

s3: mixing 80-120 parts by mass of an emulsifier solution, 80-120 parts by mass of a monomer pre-emulsion and 1-3 parts by mass of an initiator solution, heating for reaction, and then adjusting the pH value to be neutral to obtain the fluorinated modified acrylic emulsion.

4. The aqueous graphene coating for the aluminous gusset plate according to claim 1 or 2, wherein: the modified styrene-acrylic emulsion is selected from at least one of SK-6462B, Uacryl 4072.

5. The aqueous graphene coating for the aluminous gusset plate according to claim 1, wherein: in the functionalized graphene, the mass ratio of fluorinated graphene to silanized modified graphene is 1: (0.25 to 1.5).

6. The aqueous graphene coating for the aluminous gusset plate according to claim 1 or 5, wherein: the preparation method of the silanization modified graphene comprises the following steps: mixing 3-8 parts by mass of graphene, 80-90 parts by mass of water and 3-8 parts by mass of alcohol solvent, heating, adding 1-5 parts by mass of silane coupling agent, mixing and reacting, and drying a product to obtain the silanized modified graphene.

7. The aqueous graphene coating for the aluminous gusset plate according to claim 1, wherein: the filler is silicon dioxide coated water-based aluminum paste.

8. The aqueous graphene coating for the aluminous gusset plate according to claim 1, wherein: the antirust agent is at least one selected from strontium salt antirust body, FA-179 and FA-579Z.

9. The aqueous graphene coating for the aluminous gusset plate according to claim 1, wherein: the dispersant is a polymer dispersant containing pigment affinity groups.

10. The preparation method of the aqueous graphene coating for the aluminous gusset plate according to any one of claims 1 to 9, which is characterized by comprising the following steps: the method comprises the following steps:

1) mixing a dispersing agent, functionalized graphene and water, and grinding to obtain a graphene dispersion suspension;

2) mixing and stirring the water-based polycarbonate resin, the water dispersion emulsion, the filler, the pigment, the wetting agent, the antirust agent and the defoaming agent, adding the graphene dispersion suspension, mixing and stirring, adding the thickening agent to adjust the viscosity, and filtering to obtain the water-based graphene coating.

Technical Field

The invention relates to the technical field of coatings, and particularly relates to a water-based graphene coating for an aluminous gusset plate and a preparation method thereof.

Background

The aluminum gusset plate is used as a novel decorative material, various aluminum gusset plate products are processed by using various coatings on the surface of the aluminum gusset plate, and the aluminum gusset plate is widely applied to the aspects of outdoor curtain wall decoration, indoor high-grade home decoration, advertisement decoration and the like due to various colors, strong decoration, good weather resistance and good corrosion resistance. The surface treatment technology of the aluminous gusset plate mainly comprises powder spraying, roller coating, thermal transfer printing and the like. Generally divided into home decoration integrated aluminum gusset plates and engineering aluminum gusset plates. In recent years, the water-based resin and the related technology thereof gradually make breakthrough, are not inferior to solvent-based coating ink in application effect and performance, and are promoted by the concept of environmental protection, and the advantage of replacing organic solvent with water is highlighted.

The paints currently used for coating the surface of the aluminum gusset plate can be divided into solvent baking type paints, powder paints and water-based inks. The VOC emission of the solvent baking type coating is enlarged, a large amount of organic volatile matters can be discharged in the coating process, even if a ventilation device is arranged in a workshop, the air residual quantity can still cause harm to a human body, and the environment-friendly policy is not met; the powder coating has no VOC emission, but the powder coating has large dust in the spraying process and is also harmful to human bodies; the water-based ink is inferior to a solvent baking type coating in performances such as glossiness, adhesive force, resistance and the like, and cannot meet the use requirements of the aluminum gusset plate in high temperature resistance, ageing resistance and oil stain resistance.

Disclosure of Invention

In order to overcome the problems of the paint for coating the surface of the aluminum gusset plate in the prior art, the invention aims to provide the water-based graphene paint for the aluminum gusset plate, and the invention aims to provide the preparation method of the water-based graphene paint for the aluminum gusset plate.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the invention provides a water-based graphene coating for an aluminous gusset plate, which comprises the following components in parts by mass: 40-60 parts of water-based polycarbonate resin, 20-40 parts of aqueous dispersion emulsion, 0.1-1 part of functionalized graphene, 5-11 parts of filler, 0-1.5 parts of pigment, 0.1-3 parts of wetting agent, 0.3-2 parts of antirust agent, 0.1-1 part of defoaming agent, 0.2-1 part of thickening agent, 0.1-0.5 part of dispersing agent and 3-10 parts of water; wherein the aqueous dispersion emulsion is a compound of modified styrene-acrylic emulsion and fluorinated modified acrylic emulsion; the functionalized graphene is a compound of fluorinated graphene and silanized modified graphene.

Preferably, the water-based graphene coating comprises the following components in parts by mass: 40-60 parts of water-based polycarbonate resin, 20-40 parts of aqueous dispersion emulsion, 0.5-1 part of functionalized graphene, 9-10 parts of filler, 0.4-0.6 part of pigment, 0.4-0.6 part of wetting agent, 0.5-0.8 part of antirust agent, 0.1-0.2 part of defoaming agent, 0.5-0.8 part of thickening agent, 0.2-0.4 part of dispersing agent and 6-8 parts of water.

Preferably, in the aqueous dispersion emulsion of the aqueous graphene coating for the aluminous gusset plate, the mass ratio of the modified styrene-acrylic emulsion to the fluorinated modified acrylic emulsion is 1: (1-2).

Preferably, the preparation method of the fluorinated modified acrylic emulsion in the aqueous graphene coating for the aluminous gusset plate comprises the following steps:

s1: mixing 1-3 parts by mass of an anionic surfactant, 1-3 parts by mass of an emulsifier and 180-220 parts by mass of water to prepare an emulsifier solution;

s2: mixing 15-20 parts by mass of perfluorooctyl ethyl methacrylate, 45-55 parts by mass of butyl methacrylate and 2-4 parts by mass of methacrylic acid, mixing with 80-120 parts by mass of an emulsifier solution, and performing ultrasonic emulsification to obtain a monomer pre-emulsion;

s3: mixing 80-120 parts by mass of an emulsifier solution, 80-120 parts by mass of a monomer pre-emulsion and 1-3 parts by mass of an initiator solution, heating for reaction, and then adjusting the pH value to be neutral to obtain the fluorinated modified acrylic emulsion.

Preferably, in S1 of the method for preparing a fluorinated modified acrylic emulsion, the anionic surfactant is at least one selected from sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, and ammonium dodecyl sulfate; still more preferably, the anionic surfactant is sodium lauryl sulfate.

Preferably, in S1 of the preparation method of the fluorinated modified acrylic emulsion, the emulsifier is alkylphenol ethoxylates; further preferably, the emulsifier is OP-10.

Preferably, in S1 of the method for preparing a fluorinated modified acrylic emulsion, the mass ratio of the anionic surfactant, the emulsifier and the water is 1:1: 100.

Preferably, in S2 of the method for preparing a fluorinated modified acrylic emulsion, the mass ratio of perfluorooctyl ethyl methacrylate, butyl methacrylate, methacrylic acid and the emulsifier solution is 17:50:3: 100.

Preferably, in S3 of the preparation method of the fluorinated modified acrylic emulsion, the initiator is a peroxide initiator; further preferably, the initiator is a persulfate; still more preferably, the initiator is potassium persulfate.

Preferably, in S3 of the method for preparing a fluorinated modified acrylic emulsion, the initiator solution is an aqueous solution containing 3 wt% to 6 wt% of an initiator.

Preferably, in S3 of the preparation method of the fluorinated modified acrylic emulsion, the heating reaction temperature is 70-90 ℃; the heating reaction time is 3-10 h.

Preferably, in S3 of the method for preparing the fluorinated modified acrylic emulsion, the reaction is carried out under an inert atmosphere; further preferably, the reaction is carried out under nitrogen protection.

Preferably, in S3 of the method for producing a fluorinated modified acrylic emulsion, ammonia water is used to adjust the pH to neutral (pH 7). The ammonia water is selected from commercially available ammonia water.

Preferably, in S3 of the method for preparing a fluorinated modified acrylic emulsion, the mass ratio of the emulsifier solution, the monomer pre-emulsion and the initiator solution is 50:50: 1.

Preferably, in the aqueous graphene coating for the aluminous gusset plate, the modified styrene-acrylic emulsion is selected from at least one of SK-6462B, Uacryl 4072. In some preferred embodiments, SK-6462B is selected as the modified styrene-acrylic emulsion.

Preferably, in the functionalized graphene used in the aqueous graphene coating for the aluminous gusset plate, the mass ratio of the fluorinated graphene to the silanized modified graphene is 1: (0.25 to 1.5).

Preferably, in the aqueous graphene coating for the aluminous gusset plate, the parameters of the fluorinated graphene are as follows: the fluorine content is 53 wt% -65 wt%; the thickness is 5 nm-10 nm; the sheet diameter is 4-10 μm. In some preferred embodiments, the fluorinated graphene is at least one of fluorinated graphene XF225 and GCF 080.

Preferably, the preparation method of the silanization modified graphene in the waterborne graphene coating for the aluminous gusset plate comprises the following steps: mixing 3-8 parts by mass of graphene, 80-90 parts by mass of water and 3-8 parts by mass of alcohol solvent, heating, adding 1-5 parts by mass of silane coupling agent, mixing and reacting, and drying a product to obtain the silanized modified graphene.

Preferably, in the preparation method of the silanization modified graphene, the alcohol solvent is selected from at least one of methanol, ethanol, n-propanol and isopropanol; most preferably, the alcoholic solvent is ethanol.

Preferably, in the preparation method of the silanization modified graphene, the heating is specifically to 50-80 ℃; more preferably, the heating is specifically heating to 60 ℃ to 70 ℃.

Preferably, in the preparation method of the silanization modified graphene, the heating mode is water bath heating.

Preferably, in the preparation method of the silanization modified graphene, the silane coupling agent is at least one selected from KH550, KH560, KH570 and KH 580; most preferably, the silane coupling agent is KH 560.

Preferably, in the preparation method of the silanization modified graphene, the mixing reaction is specifically stirred and reacted for 3 to 5 hours at the rotating speed of 400 to 500 r/min; more preferably, the mixing reaction is carried out for 3.5 to 4.5 hours under the rotation speed of 450 r/min.

Preferably, in the preparation method of the silanization modified graphene, the mass ratio of the graphene to water to the alcohol solvent to the silane coupling agent is 2:35:2: 1.

Preferably, in the preparation method of the silanization modified graphene, the drying mode is spray drying.

Preferably, in the waterborne graphene coating for the aluminous gusset plate, the filler is silicon dioxide coated waterborne aluminum paste. The selected silicon dioxide coated waterborne aluminum paste is a high-temperature resistant filler. Further preferably, the silicon dioxide coated water-based aluminum paste is selected from at least one of ZW-9016, ZW-9012 and CY-9112. In some preferred embodiments, the silica-coated aqueous aluminum paste is CY-9112.

In the aqueous graphene paint for the aluminous gusset plate, whether the pigment is added or not can be selected according to actual conditions, and the used pigment is common pigment in the field, such as organic pigment, inorganic pigment and pearlescent pigment; preferably, the pigment may be selected from the group consisting of organic pigment yellow PY152, phthalocyanine blue PB15:2, carbon black, copper chromium black, titanium nickel yellow, titanium chromium brown, cobalt blue, cobalt green, iron oxide red.

Preferably, in the waterborne graphene coating for the aluminous gusset plate, the wetting agent is selected from at least one of TEGO-245, TEGO-270, KYC-566 and KYC-515.

Preferably, in the aqueous graphene coating for the aluminum pinch plate, the antirust agent is selected from at least one of strontium salt antirust body, FA-179 and FA-579Z; the strontium salt antirust body can be at least one selected from strontium aluminum polyphosphate hydrate (SAPP) and modified strontium aluminum polyphosphate hydrate (SRPP).

Preferably, in the waterborne graphene paint for the aluminous gusset plate, the defoaming agent is selected from at least one of KYC-713, KYC-716, KYC-750 and TEGO Airex 902W.

Preferably, in the aqueous graphene paint for the aluminous gusset plate, the thickening agent is selected from at least one of RW-8W, RW-2020 of Rohm and Haas and Coapur 830W, Coapur 3025 of Union.

Preferably, in the aqueous graphene coating for the aluminous gusset plate, the dispersant is a polymer dispersant containing pigment affinity groups; more preferably, the dispersant is at least one selected from KYC-913, BYK-190, HT-5040 and BOK-3864. In some preferred embodiments, KYC-913 is used as the dispersant.

Preferably, in the aqueous graphene coating for the aluminous gusset plate, the used water is deionized water.

The invention also provides a preparation method of the water-based graphene coating for the aluminous gusset plate.

A preparation method of the water-based graphene coating for the aluminous gusset plate comprises the following steps:

1) mixing a dispersing agent, functionalized graphene and water, and grinding to obtain a graphene dispersion suspension;

2) mixing and stirring the water-based polycarbonate resin, the water dispersion emulsion, the filler, the pigment, the wetting agent, the antirust agent and the defoaming agent, adding the graphene dispersion suspension, mixing and stirring, adding the thickening agent to adjust the viscosity, and filtering to obtain the water-based graphene coating.

Preferably, in the step 1) of the preparation method, the grinding is carried out for 6 to 10 hours by using a nano grinder at the rotating speed of 1000 to 1500 r/min; more preferably, the grinding is carried out by grinding for 7 to 9 hours at a rotation speed of 1100 to 1300r/min by using a nano grinder.

Preferably, in step 2) of the preparation method, the mixing and stirring are carried out at a stirring speed of 400r/min to 500 r/min.

Preferably, in step 2) of the preparation method, the aqueous polycarbonate resin, the aqueous dispersion emulsion, the filler, the pigment, the wetting agent, the antirust agent and the defoaming agent are mixed and stirred for 20min to 40min, and then the graphene dispersion suspension is added and mixed and stirred for 1.5h to 2.5 h.

Preferably, in step 2) of this production method, the viscosity is controlled to 120 mPas to 200 mPas at 25 ℃.

Preferably, in the step 2) of the preparation method, the filtration is carried out by a filter screen of 180 meshes to 230 meshes; most preferably, the filtration is through a 200 mesh screen.

The invention has the beneficial effects that:

the water-based graphene coating provided by the invention has the advantages of no VOC (volatile organic compounds) emission, strong applicability, good oil stain resistance, excellent water resistance, environmental protection, no pollution, long corrosion resistance and aging resistance, and the like, and can meet the use requirements of the surface coating of the aluminum gusset plate.

Specifically, the water-based graphene coating provided by the invention adopts the high-hydrophobicity modified graphene to enhance the oil stain resistance of the coating and strengthen the temperature resistance and ageing resistance of the resin and the pigment filler, and the water-based graphene coating has the advantages of strong weather resistance, no yellowing, high gloss, good adhesive force and bright color. By adopting the unique compounding of the fluorinated graphene and the fluorinated acrylic emulsion, the inherent performance of the fluorinated graphene and the fluorinated acrylic emulsion is mutually enhanced, and the overall physical performance of the coating can be enhanced. In addition, the graphene with the large specific surface area can also greatly improve the corrosion resistance of the coating.

Detailed Description

The present invention will be described in further detail with reference to specific examples.