Preparation method of composite material for polyurethane water-based coating

A technology of water-based coatings and composite materials, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of large specific surface area, low adsorption activity, and poor thermal stability of nano-graphene, and achieve good thermal stability and affinity Good performance and good thermal stability

Inactive Publication Date: 2020-08-25
YANGZHOU POLYTECHNIC INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its large specific surface area and high surface energy, nanographene is very easy to agglomerate into hard blocks in solvents and matrices, which greatly limits its application in waterborne polyurethane.
At present, how to apply nano-graphene to water-based polyurethane to solve the shortcomings of poor thermal stability and low adsorption activity of polyurethane coatings will have a huge research prospect

Method used

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  • Preparation method of composite material for polyurethane water-based coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method for a composite material for polyurethane water-based paint, comprising the steps of:

[0029] S1. Ultrasonically disperse 5kg of nano-graphene oxide in 60kg of water. The particle size of nano-graphene oxide is 10-200nm, and the thickness of the sheet is 0.1-1nm. The ultrasonic power is 400W, and then 3kg of hydrazine hydrate is added. Reflux reaction for 30h, continue to add 1kg aminophenylacetic acid, 0.5kg isoamyl nitrite, and 1kg potassium hydroxide to react for 15h, adjust the pH value of the system to 5 with concentrated sulfuric acid, filter, wash, and dry to obtain carboxylated nano-graphene;

[0030] Dissolve 1 kg of β-cyclodextrin in 60 kg of 1.2 mol / L sodium hydroxide solution, add 1 kg of epichlorohydrin dropwise under stirring for 1 hour, wash and dry to obtain pretreated cyclodextrin;

[0031] Mix 20kg of carboxylated nano-graphene and 50kg of dichloroethane evenly, add 0.2kg of silane coupling agent and stir for 1h at a temperature o...

Embodiment 2

[0035] A preparation method for a composite material for polyurethane water-based paint, comprising the steps of:

[0036] S1. Ultrasonically disperse 12kg of nano-graphene oxide in 40kg of water. The particle size of nano-graphene oxide is 10-200nm, and the thickness of the sheet is 0.1-1nm. The ultrasonic power is 500W, and then 1kg of hydrazine hydrate is added. Reflux reaction for 20h, continue to add 3kg aminophenylacetic acid, 0.15kg isoamyl nitrite, 2kg potassium hydroxide to react for 5h, adjust the pH value of the system to 5.6 with concentrated sulfuric acid, filter, wash, and dry to obtain carboxylated nano-graphene;

[0037] Dissolve 4kg of β-cyclodextrin in 40kg of 1.6mol / L sodium hydroxide solution, add 0.4kg of epichlorohydrin dropwise under stirring for 2 hours, wash and dry to obtain pretreated cyclodextrin;

[0038]Mix 10kg of carboxylated nano-graphene and 70kg of dichloroethane evenly, add 0.1kg of silane coupling agent and stir for 2 hours, the stirring te...

Embodiment 3

[0042] A preparation method for a composite material for polyurethane water-based paint, comprising the steps of:

[0043] S1. Ultrasonically disperse 8kg of nano-graphene oxide in 55kg of water. The particle size of nano-graphene oxide is 10-200nm, and the thickness of the sheet is 0.1-1nm. The ultrasonic power is 430W, and then 2.5kg of hydrazine hydrate is added. ℃ reflux reaction for 28 hours, continue to add 1.5kg aminophenylacetic acid, 0.4kg isoamyl nitrite, 1.3kg potassium hydroxide to react for 12 hours, adjust the pH value of the system to 5 with concentrated sulfuric acid, filter, wash and dry to obtain carboxylated nano Graphene;

[0044] Dissolve 3kg of β-cyclodextrin in 45kg of sodium hydroxide solution with a concentration of 1.5mol / L, add dropwise 0.6kg of epichlorohydrin to react for 1.7h under stirring, wash and dry to obtain pretreated cyclodextrin;

[0045] Mix 13kg carboxylated nano-graphene and 65kg dichloroethane evenly, add 0.12kg silane coupling agent...

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Abstract

The invention discloses a preparation method of a composite material for a polyurethane water-based coating. The preparation method comprises the following steps: preparing hydrophilic nano graphene;mixing dehydrated polypropylene glycol, dehydrated 2, 2-dihydroxymethyl propionic acid, dehydrated carboxyl polycaprolactone glycol, hydrophilic nano graphene and a catalyst, and adding dicyclohexylmethane diisocyanate under the protection of nitrogen to react to obtain a polyurethane prepolymer; and mixing the polyurethane prepolymer, a chain extender and acetone, adding 2, 4, 6-trihydroxybenzoicacid for a reaction, adding benzamide for a neutralization reaction to obtain a composite material for the polyurethane water-based paint. The coating is good in hydrophilicity, the defects of traditional waterborne polyurethane coatings in the aspects of thermal stability and adsorption performance are overcome; in addition, the coating still keeps stable and has no sedimentation phenomenon after being placed for a long time, the storage performance is excellent, the coating film quality is high, and the mechanical property is excellent.

Description

technical field [0001] The invention relates to the technical field of water-based polyurethane coatings, in particular to a method for preparing a composite material for polyurethane water-based coatings. Background technique [0002] Polyurethane coatings have good wear resistance, corrosion resistance, chemical resistance and excellent mechanical properties, and are currently widely used in household coatings, metal anti-corrosion, automotive coatings, floor paints, road marking paints, etc. However, most of the products on the market are solvent-based polyurethanes. The disadvantage of high volatile solvent content limits its use, and to some extent stimulates the development of water-based polyurethanes. [0003] Compared with solvent-based coatings, water-based polyurethane has excellent mechanical properties such as high strength, high hardness, excellent fatigue resistance and good flexibility. At the same time, water replaces organic solvents as the dispersion mediu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D7/62C09D7/63C08G18/75C08G18/66C08G18/42C08G18/48C08G18/34C08G18/30
CPCC09D175/04C09D7/62C09D7/63C08G18/758C08G18/6625C08G18/4277C08G18/4825C08G18/348C08G18/30C08K2201/011C08K13/06C08K9/08C08K9/06C08K9/04C08K3/042
Inventor 王升文
Owner YANGZHOU POLYTECHNIC INST
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