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A water-based high-hardness, corrosion-resistant amino baking varnish

An amino paint, corrosion-resistant technology, applied in the direction of anti-corrosion coatings, coatings, etc., can solve the problems of poor corrosion resistance, low hardness of emulsion-type amino paint, and achieve the effect of improving mechanical properties

Active Publication Date: 2022-04-12
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to modify the shortcomings of the emulsion-type amino baking varnish such as low hardness and poor corrosion resistance, and provide a water-based high-hardness and anti-corrosion amino baking varnish.

Method used

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  • A water-based high-hardness, corrosion-resistant amino baking varnish
  • A water-based high-hardness, corrosion-resistant amino baking varnish

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Preparation of water-based fluorine-containing acrylic emulsion:

[0055] Using the semi-continuous seed emulsion polymerization method, first prepare the seed pre-emulsion, add 40 g of deionized water, 0.36 g of OP-10 and 0.36 g of SVS to the three-necked flask, stir and mix at 250 r / min, and at the same time add Slowly add the weighed seed monomer MMA 14 g, BA 4 g, and 0.2 g buffer NaHCO 3 , then raise the temperature of the water bath to 40°C, and keep warm for 1 hour for pre-emulsification.

[0056] Add 2 g of HFBMA, 2 g of AA, 5 g of MMA and 10 g of BA, 5 g of HPMA, 0.24 g of emulsifier OP-10 and 0.24 g of SVS, and 20 g of deionized water into the beaker, and stir for 1 h to obtain a shell pre-emulsion.

[0057] Weigh 0.2 g KPS and dissolve in 10 g deionized water to obtain an initiator solution. After raising the temperature of the water bath to 82°C, add 1 / 3 of the initiator solution into the three-neck flask, react for a period of time to obtain a bluish s...

Embodiment 2

[0066] (1) Preparation of water-based fluorine-containing acrylic emulsion:

[0067] Same as Example 1

[0068] (2) Preparation of DGr powder:

[0069] First, stir in 200 g deionized water for 30 minutes to dissolve 1 g of sodium bicarbonate, then add 5 g of graphite and 0.5 g of dopamine and continue to stir and dissolve for 30 minutes; pour the mixed solution after ultrasonic treatment into a ball mill tank and proceed at a speed of 250 r / min Ball milling for 48 hours; finally obtain a high-quality edge carboxylated modified graphene suspension, centrifuge to clean unreacted dopamine and graphite, and take the supernatant to suction, filter and freeze-dry to obtain DGr powder.

[0070] (3) Preparation of DGr-TA powder:

[0071] Take 1 g of the above-mentioned DGr powder and 0.1 g of tannic acid and add it to 50 g of deionized water, and ultrasonically oscillate for 24 hours to obtain non-covalently bound DGr-TA. At this time, centrifuge to remove unreacted tannic acid, and...

Embodiment 3

[0081] (1) Preparation of water-based fluorine-containing acrylic emulsion:

[0082] Same as Example 1

[0083] (2) Preparation of Gr-TA powder:

[0084] Same as Example 2

[0085] (3) Preparation of water-based amino baking varnish:

[0086] Add the amino resin into the water-based fluorine-containing acrylic emulsion, first stir for 20 minutes at a speed of 400-600 r / min, then dissolve and disperse the DGr-TA powder in deionized water, and pour it into the emulsion. Increase the rotation speed to 800-1000 r / min and stir for 30 minutes to obtain a water-based high-hardness and corrosion-resistant amino baking varnish. The mass percentage of this water-based amino resin is as follows:

[0087] Water-based fluorinated acrylic emulsion 60%

[0088] Deionized water 31.75%

[0089] Defoamer 0.25%

[0090] Amino resin 6.75%

[0091] N,N-Dimethylethanolamine 1%

[0092] DGr-TA 0.2%.

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Abstract

The invention discloses a water-based high-hardness and corrosion-resistant amino baking varnish. On the one hand, during the ball milling process, carbon dioxide gas generated by sodium bicarbonate is used to simulate a high-temperature and high-pressure environment, and carboxylation is carried out on the edge of graphene to provide conditions for dopamine grafting. Finally, dopamine-grafted edge carboxylated graphene (DGr) was obtained, and then tannic acid was used to improve the dispersion of DGr to obtain DGr‑TA powder. On the other hand, a semi-continuous seed emulsion polymerization method is used to copolymerize the organic fluorine monomer and the acrylic acid monomer to obtain the fluorine-containing acrylic acid emulsion. Finally, the fluorine-containing acrylic emulsion is mixed with the amino resin, and DGr-TA is introduced as a reinforcing agent through physical blending during the mixing process to obtain a water-based high-hardness, anti-corrosion amino baking varnish. The obtained water-based amino baking varnish has excellent mechanical properties and anti-corrosion performance.

Description

technical field [0001] The invention belongs to the technical field of water-based coatings, in particular to a water-based high-hardness, corrosion-resistant amino baking varnish, whose mechanical properties and anti-corrosion properties are significantly improved. Background technique [0002] With the improvement of people's awareness of environmental protection and health, the traditional oil-based paint can no longer meet the development trend because of its high VOC emissions. People need a green and environmentally friendly water-based paint to replace it. Water-based paints use water as a solvent or dispersant without adding organic solvents, so that they have very low VOC emissions. Therefore, water-based paints have the advantages of non-toxic, environmentally friendly, odorless, low VOC content, non-flammable and explosive, etc. are becoming more and more popular. [0003] Emulsion-type acrylic amino baking varnish is to add amino resin to acrylic emulsion, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D133/12C09D161/32C09D7/62C09D5/08
CPCC09D133/16C09D7/62C09D5/08C08L61/32C08K9/04C08K9/08C08K3/042
Inventor 郑玉婴杨文杰
Owner FUZHOU UNIV