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Preparation method of waterborne polyurethane coating with good corrosion resistance

A water-based polyurethane and anti-corrosion technology, used in polyurea/polyurethane coatings, anti-corrosion coatings, coatings, etc., can solve the problems of poor anti-corrosion effect of coatings, poor acid and alkali resistance, etc., to improve anti-corrosion performance and improve mechanics The effect of performance and strong adhesion

Inactive Publication Date: 2020-02-18
ANHUI XINDALU SPECIAL PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent with the application number CN104789100B discloses a water-based polyurethane moisture-proof and anti-corrosion coating and its preparation method, using diphenylmethane diisocyanate and oligomer diol as main raw materials, trimethylolpropane as auxiliary agent, epoxy resin - The diethanolamine adduct is used as an internal crosslinking agent, and epoxy resin is used as a modifier, which is polymerized. However, the coating prepared by it has poor anti-corrosion effect and poor acid and alkali resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Add 11 parts of graphene oxide, 6 parts of 3,5-diamino-1,2,4-triazole, and 23 parts of acetone into a ball mill jar, put agate grinding beads into it, and rotate at a speed of 900r / min, the temperature of the oil bath is 75°C for 3 hours, and then the resultant is filtered, washed with deionized water, and then dried at 42°C.

[0015] (2) Calcium titanate is calcined at 123°C for 3h, and then put into ice water for ball milling until the particle size is 100-500μm.

[0016] (3) Disperse the obtained graphene oxide in deionized water, disperse at 38°C and 140r / min for 18 minutes, then add 5 parts of cobalt chloride and 13 parts of calcium titanate to it, continue to disperse for 12 minutes, and transfer the obtained system to Put it into a reaction kettle, react at 161°C for 13h, then drop to room temperature at a rate of 3°C / min, filter, wash with deionized water, and dry at 46°C to obtain a graphene oxide composite containing metal ions;

[0017] (4) Add 70 parts ...

Embodiment 2

[0021] (1) Calcium titanate was calcined at 123°C for 3h, and then put into ice water for ball milling until the particle size was 100-500μm.

[0022] (2) Disperse the obtained graphene oxide in deionized water, disperse at 38°C and 140r / min for 18 minutes, then add 5 parts of cobalt chloride and 13 parts of calcium titanate to it, continue to disperse for 12 minutes, and transfer the obtained system to Put it into a reaction kettle, react at 161°C for 13h, then drop to room temperature at a rate of 3°C / min, filter, wash with deionized water, and dry at 46°C to obtain a graphene oxide composite containing metal ions;

[0023] (3) Add 70 parts of 1,5-naphthalene diisocyanate to 150 parts of acetone, stir and dissolve at 43 °C and 160 rpm for 17 minutes, then add the obtained graphene oxide compound containing metal ions to it, and heat up to 68 °C , reacting at 250rpm for 5h to obtain a graphene oxide composite-isocyanate prepolymer containing metal ions;

[0024] (4) Add 55 p...

Embodiment 3

[0027] (1) Add 11 parts of graphene oxide, 6 parts of 3,5-diamino-1,2,4-triazole, and 23 parts of acetone into a ball mill jar, put agate grinding beads into it, and rotate at a speed of 900r / min, the temperature of the oil bath is 75°C for 3 hours, and then the resultant is filtered, washed with deionized water, and then dried at 42°C.

[0028] (2) Calcium titanate is calcined at 123°C for 3h, and then put into ice water for ball milling until the particle size is 100-500μm.

[0029] (3) Add 70 parts of 1,5-naphthalene diisocyanate to 150 parts of acetone, stir and dissolve at 43°C and 160rpm for 17min, then add treated graphene oxide and calcium titanate to it, and heat up to 68°C , reacting at 250rpm for 5h to obtain a graphene oxide composite-isocyanate prepolymer containing metal ions;

[0030] (5) Add 55 parts of polyol, 0.04 parts of catalyst, and 7 parts of chain extender to 70 parts of prepolymer, continue to stir and react for 4 hours, cool down, and then add 3 part...

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Abstract

The invention discloses a preparation method of a waterborne polyurethane coating with good corrosion resistance, and particularly relates to the technical field of anticorrosive coatings, and the prepared waterborne polyurethane coating has excellent corrosion resistance, good acid and alkali resistance, scratch resistance, strong adhesive force and high hardness; he method comprises the following steps: carrying out ball milling treatment on graphene oxide and 3, 5-diamino-1, 2, 4-triazole at high temperature, so that on one hand, amino in the 3, 5-diamino-1, 2, 4-triazole can react with anepoxy group on a graphene oxide sheet layer, and a large conjugated system is formed by cyclic conjugation of the 3, 5-diamino-1, 2, 4-triazole and the graphene oxide; the flow of electrons is facilitated, and the electrical conductivity is enhanced; on the other hand, the 3,5-diamino-1,2, 4-triazole provides amino and triazole with stronger activity, nitrogen atoms in the triazole can be complexed with cobalt ions added subsequently and oxygen atoms in calcium titanate, so that more metal ions are introduced to the surface of the graphene oxide to form a conductive network in a high polymer matrix, and the corrosion resistance of the obtained coating is improved.

Description

technical field [0001] The invention belongs to the technical field of anticorrosion coatings, in particular to a method for preparing a water-based polyurethane coating with better anticorrosion performance. Background technique [0002] Anti-corrosion coatings are widely used in modern industry, transportation, energy, marine engineering and other departments. At present, anti-corrosion coatings in the world are mainly synthetic coatings based on artificial synthetic resins. Most of the synthetic coatings contain a large amount of organic solvents and certain Toxic pigments, etc., cause environmental pollution and endanger human health. Therefore, water-based anti-corrosion coatings have become the focus of research and development of environmentally friendly coatings due to their advantages of safety, convenience, energy saving, and environmental protection. [0003] Water-based polyurethane coating is a type of coating based on water-based polyurethane resin and water as...

Claims

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Application Information

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IPC IPC(8): C09D175/08C09D5/08C08G18/76C08G18/66C08G18/48C08G18/32C08G18/10
CPCC08G18/10C08G18/3206C08G18/3851C08G18/48C08G18/6685C08G18/7678C09D5/08C09D175/08C08K9/04C08K3/042C08G18/6674
Inventor 王保军拾振洪李海洋金传亮回留柱王家振
Owner ANHUI XINDALU SPECIAL PAINT CO LTD
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