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Preparation method of modified water-based polyurethane coating

A water-based polyurethane modification technology, applied in the field of preparation of modified water-based polyurethane coatings, can solve the problems of inability to carry out large-scale production, harsh reaction conditions, complex preparation process, etc., and achieve good operability and repeatability and excellent reaction conditions Gentle, agglomeration-avoiding effect

Inactive Publication Date: 2018-03-23
管新兵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process of this kind of modification method is complex, the reaction conditions are harsh, the processing efficiency is low, the cost is expensive, and it cannot be mass-produced

Method used

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  • Preparation method of modified water-based polyurethane coating
  • Preparation method of modified water-based polyurethane coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of modified graphene: uniformly disperse 0.8g graphene oxide in water to make a 2mg / mL graphene oxide suspension, and add 0.2g dopamine to mix evenly, and adjust to pH = 8.5, react at 0°C to obtain a modified graphene suspension.

[0026] (2) Preparation of modified nano-silicon dioxide: 1 g of nano-silicon dioxide and 0.3 g of polyallylamine were uniformly dispersed in water, and reacted at room temperature to obtain modified nano-silicon dioxide.

[0027] (3) Composite modification: the 0.2g modified graphene obtained by step (1) and the 15g modified nano-silicon dioxide obtained by step (2) are dispersed in 85g water-based polyurethane, 1500rpm high-speed stirring and mixing at room temperature for 1h, Then, the solvent was distilled off under reduced pressure to obtain a modified water-based polyurethane coating.

[0028] In the modified water-based polyurethane coating prepared in (3), the mass percentage of the modified graphene accounting for the...

Embodiment 2

[0030] (1) Preparation of modified graphene: uniformly disperse 0.8g graphene oxide in water to make a 2mg / mL graphene oxide suspension, and add 0.4g dopamine to mix evenly, and adjust to pH= 8.5, react at 0°C to obtain a modified graphene suspension.

[0031] (2) Preparation of modified nano-silicon dioxide: 1 g of nano-silicon dioxide and 0.6 g of polyallylamine were uniformly dispersed in water, and reacted at room temperature to obtain modified nano-silicon dioxide.

[0032] (3) Composite modification: the 0.4g modified graphene obtained by step (1) and the 15g modified nano-silicon dioxide obtained by step (2) are dispersed in 85g water-based polyurethane, 1500rpm high-speed stirring and mixing at room temperature for 1h, Then, the solvent was distilled off under reduced pressure to obtain a modified water-based polyurethane coating.

[0033] In the modified water-based polyurethane coating prepared in (3), the mass percent of the modified graphene in the total system is...

Embodiment 3

[0035] (1) Preparation of modified graphene: 0.8g graphene oxide is uniformly dispersed in water to make a 2mg / mL graphene oxide suspension, and 0.6g dopamine is added to mix evenly, and adjusted to pH = 8.5, react at 0°C to obtain a modified graphene suspension.

[0036] (2) Preparation of modified nano-silicon dioxide: 1 g of nano-silicon dioxide and 0.9 g of polyallylamine were uniformly dispersed in water, and reacted at room temperature to obtain modified nano-silicon dioxide.

[0037] (3) Composite modification: the 0.6g modified graphene obtained by step (1) and the 15g modified nano-silicon dioxide obtained by step (2) are dispersed in 85g water-based polyurethane, 1500rpm high-speed stirring and mixing at room temperature for 1h, Then, the solvent was distilled off under reduced pressure to obtain a modified water-based polyurethane coating.

[0038] In the modified water-based polyurethane coating prepared in (3), the mass percent of the modified graphene in the tot...

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Abstract

The invention discloses a preparation method of a modified water-based polyurethane coating. The method comprises the following steps of (1) utilizing dopamine for carrying out surface polymerizationfor modifying graphene; (2) adopting a polyelectrolyte for carrying out surface modification on nanosilicon dioxide; (3) uniformly mixing the modified graphene, the modified nanosilicon dioxide and water-based polyurethane, and reacting to obtain the composite modified water-based polyurethane coating. The method has the advantages of simple and easy operation, low energy consumption, environmentfriendliness, and easy industrial production; the graphene and the nanosilicon dioxide can be stably and uniformly dispersed into the water-based polyurethane, so that the agglomeration of a nanometerfiller is effectively avoided, and the storage stability of the composite modified coating is good. Meanwhile, surface active groups of the graphene and the nanosilicon dioxide are reacted with the water-based polyurethane to form a multiple cross-linked network structure, so that the composite modified coating is endowed with favorable hardness, salt water resistance, solvent resistance, heat resistant stability and favorable binding strength with a coating base material, and can be used as surface coatings of various plastics and metal plates.

Description

technical field [0001] The invention relates to a method for preparing a modified water-based polyurethane coating, in particular to a method for preparing a modified graphene-nano silicon dioxide-based water-based polyurethane coating. Background technique [0002] Water-based polyurethane coating is a water-based coating that uses water-dispersible polyurethane as the base material and uses water as a dispersant during use. Compared with traditional solvent-based polyurethane coatings, water-based polyurethane coatings have the advantages of non-toxicity, environmental friendliness, etc., and have good weather resistance, grease resistance, etc., and are widely used as protective coatings on the surface of materials. However, water-based polyurethane coating products have poor water resistance, heat resistance, solvent resistance, and mechanical strength, which limits their application fields to a certain extent. In order to further improve the comprehensive performance o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D7/62
CPCC09D175/08C08K3/04C08K3/36C08K9/04C08K9/08C08K13/06C08K2201/011
Inventor 管新兵
Owner 管新兵
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