A method for improving the corrosion resistance of polyvinyl alcohol water-based coatings by heating and secondary curing

A polyvinyl alcohol water-based, secondary curing technology, used in anti-corrosion coatings, devices for coating liquid on surfaces, coatings, etc., can solve the problems of weakened corrosion resistance, poor compatibility, weak performance, etc., to prevent penetration. Erosion, firm coating, densification effect

Active Publication Date: 2021-05-18
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the compatibility between hydrophobic nanofillers and water-based coatings is poor, and the interface between nanofillers and water-based coating resins is often the weakest place in performance, and corrosive media can easily penetrate into the metal matrix through the interface between fillers and organic resins. surface, causing corrosion
On the other hand, the compatibility between hydrophilic nanofillers and water-based coatings is greatly improved compared with hydrophobicity, but hydrophilic fillers often contain or artificially introduce a large number of polar groups, which results in the While the compatibility with the resin is improved, a large number of polar groups are introduced to form water transport channels, resulting in weakened corrosion resistance
Therefore, the improvement of the corrosion resistance of water-based coatings still faces great challenges.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for increasing the temperature and secondary curing to improve the corrosion resistance of polyvinyl alcohol water-based coatings, comprising the steps of:

[0039] Step 1, dissolving the base:

[0040] Add 100 g of polyvinyl alcohol with an alcoholysis degree of 98% to 20,000 g of deionized water, place it in a flask, and add a polytetrafluoroethylene rotor, and stir continuously for 24 hours in a collector type constant temperature heating magnetic stirrer from room temperature to 95 ° C, until The polyvinyl alcohol is fully dissolved, then slowly cooled to room temperature, and finally filtered with a 400-mesh filter to remove impurities in the solution to obtain a pure polyvinyl alcohol solution;

[0041] Step 2, mix the filling:

[0042] Weigh 3g graphene, 1g phosphorus powder, 0.01g SiO 2 , 0.1gSiC, mixed evenly to make a mixed filler; the size of graphene is 900-2000nm, the particle size of phosphorus powder is 0.1-0.5nm, SiO 2 The particle size of Si...

Embodiment 2

[0057] A method for increasing the temperature and secondary curing to improve the corrosion resistance of polyvinyl alcohol water-based coatings, comprising the steps of:

[0058] Step 1, dissolving the base:

[0059] Add 100 g of polyvinyl alcohol with a degree of alcoholysis of 98% to 15000 g of deionized water, place it in a flask, and add a polytetrafluoroethylene rotor, and stir continuously for 24 hours in a collector type constant temperature heating magnetic stirrer from room temperature to 95 ° C, until The polyvinyl alcohol is fully dissolved, then slowly cooled to room temperature, and finally filtered with a 400-mesh filter to remove impurities in the solution to obtain a pure polyvinyl alcohol solution;

[0060] Step 2, mix the filling:

[0061] Weigh 7g graphene, 5g phosphorus powder, 0.5g SiO 2 , 5g SiC, mixed evenly to make a mixed filler; the size of graphene is 900-2000nm, the particle size of phosphorus powder is 0.1-0.5nm, SiO 2 The particle size of SiC...

Embodiment 3

[0076] A method for increasing the temperature and secondary curing to improve the corrosion resistance of polyvinyl alcohol water-based coatings, comprising the steps of:

[0077] Step 1, dissolving the base:

[0078] Add 100 g of polyvinyl alcohol with a degree of alcoholysis of 98% to 10000 g of deionized water, place it in a flask, and add a polytetrafluoroethylene rotor, and stir continuously for 24 hours at room temperature to 95 ° C in a collector type constant temperature heating magnetic stirrer, until The polyvinyl alcohol is fully dissolved, then slowly cooled to room temperature, and finally filtered with a 400-mesh filter to remove impurities in the solution to obtain a pure polyvinyl alcohol solution;

[0079] Step 2, mix the filling:

[0080] Weigh 5g graphene, 3g phosphorus powder, 0.2g SiO 2 , 0.5g SiC, mixed evenly to make a mixed filler; the size of graphene is 900-2000nm, the particle size of phosphor powder is 0.1-0.5nm, SiO 2 The particle size of SiC i...

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Abstract

A method for improving the corrosion resistance of polyvinyl alcohol water-based coatings by heating and secondary curing, belonging to the technical field of coatings, the method adopts graphene, phosphor powder, SiO 2 , SiC is added to the polyvinyl alcohol solution as a mixed filler, and the coating is stabilized by secondary curing by heating. The invention utilizes the high thermal conductivity of nano fillers to improve the secondary curing efficiency, effectively reduce the binding sites of water molecules in the coating, and greatly reduce the water transport channels formed by polar groups in the coating, thereby improving the adhesion of the coating and corrosion resistance; at the same time, the secondary curing can strengthen the coating, enhance the combination of mixed fillers, further promote the barrier effect of graphene, and promote the formation of phosphorus and SiO 2 And SiC play its role in improving the cross-linking density of the coating to form a stable and dense three-dimensional network structure, thereby improving the compactness of the coating and achieving a better anti-corrosion effect; the method of the invention is safe and environmentally friendly, simple to operate, and has better realization sex.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a method for improving the corrosion resistance of polyvinyl alcohol water-based coatings by temperature-rising secondary curing. Background technique [0002] The most common and effective way to prevent metal corrosion is to apply anti-corrosion coatings. Traditional solvent-based anti-corrosion coatings contain a large amount of toxic volatile organic compounds, which seriously endanger people's health. Therefore, water-based coatings that do not contain or volatile toxic substances The development of coatings is imminent. Water-based paints use water as a solvent or dispersant, and the film-forming substances of water-based paints themselves contain polar groups such as hydroxyl groups or artificially grafted polar groups to improve their solubility or dispersibility in water. However, during the film formation process, with the volatilization of water, the pola...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D129/04C09D5/08C09D7/61B05D5/00B05D3/00B05D7/14B05D1/38
CPCB05D3/002B05D5/00B05D7/14B05D7/542B05D7/544B05D7/582B05D7/584C08K2003/325C09D5/08C09D129/04C09D7/61C08K3/042C08K3/36C08K3/34C08K3/32
Inventor 吴航张俊波王福会耿树江
Owner NORTHEASTERN UNIV LIAONING
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