A kind of water-based polyamide-imide anti-corrosion non-stick coating and preparation method thereof

A polyamide-imide and non-stick coating technology, which is applied in the direction of anti-corrosion coatings, fire-proof coatings, coatings, etc., can solve the problems of difficult water-based PAI synthesis technology, the need to improve anti-corrosion performance, and high VOCs emissions, and achieve the elimination of relative Interface and interface cracking, avoid storage instability, good compatibility effect

Active Publication Date: 2022-02-18
HANGZHOU JIHUA POLYMER MATERIAL CO LTD +1
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Problems solved by technology

[0004] However, at present, domestic PAI resins are mainly solvent-based, and organic solvents need to be used as diluting solvents, which cause great environmental pollution and poor safety. Moreover, when used in water-based non-stick coatings, more organic solvents will be introduced, resulting in higher VOCs emissions in the end.
However, the synthesis technology of water-based PAI is relatively difficult, and it is still controlled by a few companies (such as Solvay's AI-10, Quark's SI-601, Bolian's BLPSY225, etc.), and there is a certain technical threshold, and water-based PAI is used as a viscous material. Knot resin is sprayed on iron substrates, compared with oil-based PAI, the anti-corrosion performance still needs to be improved

Method used

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  • A kind of water-based polyamide-imide anti-corrosion non-stick coating and preparation method thereof

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preparation example Construction

[0062] A preparation method of water-based polyamide-imide anti-corrosion non-stick coating, comprising the following steps:

[0063] 1) Preparation of PAI:

[0064] 1.1) Scheme 1: add trimellitic anhydride to the reaction flask and dissolve in N-methylpyrrolidone and xylene, under the protection of an inert gas, heat to 70-90°C, when the trimellitic anhydride is completely dissolved, add diphenylmethane-4, 4'-diisocyanate, heat preservation reaction for 1-3h, heat up to 120-140°C, continue heat preservation reaction for 3-5h, wash with absolute ethanol, suction filter and dry to obtain PAI; trimellitic anhydride and diphenylmethane-4,4 The molar ratio of '-diisocyanate is 1:1-1.05, the quality of N-methylpyrrolidone is 2-3 times of the sum of trimellitic anhydride and diphenylmethane-4,4'-diisocyanate, and the content of xylene is 5- 10 wt%.

[0065] 1.2) Option 2:

[0066] Preparation of isocyanate-terminated polyamide-imide: dissolve the acid anhydride in a solvent, heat...

Embodiment 1

[0075] 1) Preparation of PAI: Add trimellitic anhydride to the reaction flask and dissolve in NMP and xylene, under nitrogen protection, heat to 70°C, when trimellitic anhydride is completely dissolved, add diphenylmethane-4,4'-diisocyanate, Heat preservation reaction for 3 hours, heat up to 120°C, continue heat preservation reaction for 5 hours, wash with absolute ethanol, suction filter and dry to obtain PAI. The mol ratio of trimellitic anhydride and diphenylmethane-4,4'-diisocyanate is 1:1, the quality of NMP is 2 times of the sum of trimellitic anhydride and diphenylmethane-4,4'-diisocyanate, and the content of xylene is 5wt%.

[0076] 2) Preparation of PAI emulsion: Dissolve the PAI prepared in step 1) in 5wt% of NMP, add 1wt% of SDBS and TMN-10 with a mass ratio of 1:6, mix evenly with high-speed shear stirring, and the stirring rate is 6000rpm , and then dropwise add 70wt% deionized water until the viscosity of the system drops suddenly, less than 1Pa·s, add the unfin...

Embodiment 2

[0079] 1) Preparation of PAI: add trimellitic anhydride to the reaction flask and dissolve in NMP and xylene, under nitrogen protection, heat to 90°C, when the trimellitic anhydride is completely dissolved, add diphenylmethane-4,4'-diisocyanate, Heat preservation reaction for 1 hour, heat up to 140°C, continue heat preservation reaction for 3 hours, wash with absolute ethanol, suction filter and dry to obtain PAI. The mol ratio of trimellitic anhydride and diphenylmethane-4,4'-diisocyanate is 1: 1.05, the quality of NMP is 3 times of the sum of trimellitic anhydride and diphenylmethane-4,4'-diisocyanate, and the content of xylene is 10 wt%.

[0080] 2) Preparation of PAI emulsion: Dissolve the PAI prepared in step 1) in 10wt% NMP, add 2wt% of STBS and TMN-6 with a mass ratio of 1:2, mix evenly with high-speed shear stirring, and the stirring rate is 4000rpm , and then dropwise add 65wt% deionized water until the viscosity of the system suddenly drops to less than 1Pa·s, add t...

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Abstract

The invention relates to the field of coatings, and discloses a water-based polyamide-imide anti-corrosion non-stick coating and a preparation method thereof, comprising: 30-60 parts of fluororesin emulsion, 20-40 parts of PAI emulsion, and 15- parts of anti-corrosion filler 30 parts, 10-20 parts of pigments, 1-5 parts of additives, 1-5 parts of pH adjuster, and 10-30 parts of water. In the present invention, PAI resin is first prepared, and then anionic surfactant and nonionic surfactant are used as emulsifiers to prepare PAI emulsion with good stability by a phase inversion method. A composite resin is formed with PAI emulsion and fluororesin emulsion, and a flaky or scaly anti-corrosion filler is added to the composite resin to obtain a polyamide-imide anti-corrosion non-stick coating. The anti-corrosion filler and the bonding resin can form a dense coating. layer, which can effectively enhance the corrosion resistance of the coating film.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a water-based polyamide-imide anti-corrosion and non-stick coating and a preparation method thereof. Background technique [0002] Non-stick coating is a special coating whose coating surface is not easily adhered by other substances or easily removed after adhesion. The coating formed by this type of coating has the characteristics of extremely low surface energy, small friction coefficient, and easy sliding, and is widely used in household appliances, cooking utensils, automobiles, machinery, and chemical industries. Compared with traditional oil-based coatings, water-based non-stick coatings have the advantages of less organic solvents, better safety, less environmental pollution and compliance with food hygiene requirements. It is one of the guiding directions of national industrial policies. Water-based non-stick coatings are mainly composed of fluororesin dispersions such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D127/18C09D179/08C09D5/08C08G73/14C08G81/00C08J3/03C08L79/08
CPCC09D127/18C09D179/08C09D5/08C09D5/18C08G73/14C08G81/00C08J3/03C08J2379/08C08L2201/08
Inventor 刘海龙钱涛
Owner HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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