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Flame-retardant self-repairing waterborne polyurethane composite coating agent as well as preparation method and application thereof

A water-based polyurethane, self-healing technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor flame retardancy, low mechanical strength, limited life of paint film protection, etc. Mechanical properties, the effect of promoting self-healing efficiency

Active Publication Date: 2022-05-31
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide a flame-retardant self-repairing waterborne polyurethane composite coating agent and its preparation method and application, which overcomes the poor flame retardancy, low mechanical strength and poor paint quality of traditional waterborne polyurethane coatings. The problem of limited life of membrane protection

Method used

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  • Flame-retardant self-repairing waterborne polyurethane composite coating agent as well as preparation method and application thereof
  • Flame-retardant self-repairing waterborne polyurethane composite coating agent as well as preparation method and application thereof

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preparation example Construction

[0035] The invention discloses a method for preparing a flame-retardant self-repairing water-based polyurethane composite coating agent. The process steps are as follows:

[0036] 1. Preparation of amino-terminated hyperbranched polyphosphazene modified nanoparticles (HBPC)

[0037] 1) Ultrasonic disperse 0.1-10 parts of nanoparticles in 50-1000 parts of water / ethanol mixed solution, slowly add 0.01-2 parts of coupling agent, at a speed of 300-500r / min, and a reaction temperature of 60-80°C Under the conditions of reaction for 5-8h, after the completion of the reaction, centrifuge washing with deionized water and absolute ethanol, and then vacuum-dry to obtain aminated nanoparticles (NP-NH 2 );

[0038] Wherein, the nanoparticles are nano silicon dioxide (SiO 2 ), nano-titanium dioxide (TiO 2 ), graphene oxide (GO), hydrotalcite (LDH), montmorillonite (MMT), two-dimensional metal-organic framework film (MOF) and nano-magnesium hydroxide (MH); the particles of the nanopartic...

Embodiment 1

[0055] 1. Amino-terminated hyperbranched polyphosphazene modified nano-silica (HBPC-SiO 2 ) preparation

[0056] 1) Mix 1 part of 50nm silicon dioxide (SiO 2 ) ultrasonically dispersed in 100 parts of water / ethanol mixed solution, slowly add 0.01 part of 3-aminopropyltrimethoxysilane as a coupling agent, react at 74°C for 6 hours at a speed of 300r / min, and use deionized water after the reaction is completed Centrifugal washing with absolute ethanol, and then vacuum drying to obtain aminated nano-silica (NP-SiO 2 -NH 2 );

[0057] 2) Add 0.1 part of NP-SiO 2 -NH 2 Add to 50 parts of tetrahydrofuran solution, add a total of 5 parts of hexachlorocyclotriphosphazene and 1,6-hexanediamine according to a feed ratio of 1:4; add 0.5 parts of triethylamine as an acid-binding agent, Feed nitrogen and react at a speed of 300r / min and a temperature of 65°C for 6h to obtain amino-terminated hyperbranched polyphosphazene-modified nano-silica (HBPC-SiO 2 );

[0058] 2. HBPC-SiO with...

Embodiment 2

[0064] 1. Amino-terminated hyperbranched polyphosphazene modified nano-silica (HBPC-SiO 2 ) preparation

[0065] 1) Two parts of 1000nm silicon dioxide (SiO 2 ) ultrasonically dispersed in 200 parts of water / ethanol mixed solution, slowly add 0.02 parts of 3-aminopropyltriethoxysilane as a coupling agent, and react at 70°C for 7 hours at a speed of 300r / min. After the reaction is completed, use a deionized Centrifugal washing with water and absolute ethanol, and then vacuum drying to obtain aminated nano-silica (NP-SiO 2 -NH 2 );

[0066] 2) Add 0.1 part of NP-SiO 2 -NH 2 Join in 50 parts of tetrahydrofuran solutions, add a total amount of 8 parts of hexachlorocyclotriphosphazene and 1,8-octanediamine at a feed ratio of 3:5; add 0.8 parts of triethylamine as an acid-binding agent, and Into nitrogen and at a rotating speed of 500r / min and a temperature of 70°C, react for 6h to obtain amino-terminated hyperbranched polyphosphazene-modified nano-silica (HBPC-SiO 2 );

[0...

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Abstract

The invention discloses a flame-retardant self-repairing waterborne polyurethane composite coating agent as well as a preparation method and application thereof, and belongs to the technical field of production of coating agents. The method comprises the following steps: reacting nano particles with a coupling agent to prepare aminated nano particles; enabling the aminated nano particles to react with phosphonitrilic chloride trimer and diamine, so as to prepare amino-terminated hyperbranched polyphosphazene modified nano particles (HBPC); then mixing polyester glycol, a hydrophilic monomer and diisocyanate to react, so as to prepare an isocyanate group-terminated prepolymer solution; a dynamic reversible covalent bond monomer, a dynamic reversible non-covalent bond monomer and HBPC are added into the prepolymer solution for a reaction, and a chain extension product solution is prepared; and adding a neutralizing agent into the chain extension product solution for reaction to prepare the HBPC waterborne polyurethane with flame-retardant and self-repairing functions. The prepared flame-retardant self-repairing waterborne polyurethane composite coating agent has a hyperbranched and double reversible bond structure, can realize quick and efficient self-repairing at high temperature, and can be applied to flame-retardant self-repairing coatings of wood lacquer.

Description

technical field [0001] The invention belongs to the technical field of finishing agent production, and in particular relates to a flame-retardant self-repairing water-based polyurethane composite finishing agent and a preparation method and application thereof. Background technique [0002] Waterborne polyurethane (WPU) has the characteristics of environmental protection, easy processing, high solid content, easy film formation and chemical resistance, and is widely used in leather finishing, building materials and coatings. However, WPU has poor flame retardant performance, low mechanical strength, and is prone to macroscopic damage or cracking under the action of external force. Its service life and protection life cannot be guaranteed, and it cannot meet people's needs in practical applications. [0003] At present, the flame retardant properties of reactive flame retardant WPU can be improved by adding flame retardants. For example, Chinese invention patent (CN108059913...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/12C08G18/66C08G18/48C08G18/42C08G18/34C08G18/64C08G18/32C08G18/38C08G79/025C09D175/04
CPCC08G18/12C08G18/4854C08G18/4277C08G18/4833C08G18/348C08G18/4081C08G18/6692C08G18/6659C08G79/025C09D175/04C08G2150/00C08G18/6461C08G18/3897C08G18/3848C08G18/3855C08G18/3844Y02E60/10
Inventor 刘超史炳瑞张佳豪汪义静薛新袁启明
Owner SHAANXI UNIV OF SCI & TECH
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