An environmentally friendly phosphorus-free pretreatment solution suitable for water-based paints and its preparation and application

A technology of pretreatment liquid and water-based paint, applied in coating, anti-corrosion coating and other directions, can solve the problems of water-based paint construction quality, poor adhesion of paint film, poor film-forming ability, etc., so as to solve the problem of poor film-forming ability , Good film-forming stability, and the effect of improving corrosion resistance

Active Publication Date: 2021-02-09
金华市鸿新新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the actual application of water-based paint, it is usually necessary to pre-treat the substrate (such as a metal substrate), and the pre-treatment liquid currently used often contains harmful substances such as phosphorus and chromium, which will cause harm to the environment. At the same time, the existing pretreatment liquid usually has problems such as poor film-forming property and poor bonding force with water-based paint film, which will also cause serious quality impact on subsequent water-based paint construction.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment is applicable to the environmental protection phosphorus-free pretreatment solution of water-based paint, which is prepared from the following components and raw materials in mass percentage: 18% of modified water-based resin grafted nano-cellulose, 1% of composite complexing agent, retarder 0.1% etchant, 0.4% sodium nitrate, and deionized water as the balance.

[0036] Wherein, the modified water-based resin grafted nano-cellulose is modified water-based polyurethane grafted nano-cellulose, and the preparation method comprises the following steps:

[0037] Step (I): Mix polycaprolactone diol, isophorone diisocyanate, and dimethylol butyric acid, stir and react at 86°C for 3 hours, add acetone to obtain product I, and ultrasonically disperse product I , followed by adding tannic acid and 1,4-butanediol to the ultrasonically dispersed product I at 65°C, stirring and refluxing for 5 hours, and naturally cooling to room temperature to obtain a polyurethane ...

Embodiment 2

[0055] This embodiment is applicable to the environmental protection phosphorus-free pretreatment solution of water-based paint, which is prepared from the following components and raw materials in mass percentage: 20% of modified water-based resin grafted nano-cellulose, 1.1% of composite complexing agent, slow 0.1% etchant, 0.4% sodium nitrate, and deionized water as the balance.

[0056] Wherein, the modified water-based resin grafted nano-cellulose is modified water-based polyurethane grafted nano-cellulose, and the preparation method comprises the following steps:

[0057] Step (I): Mix polycaprolactone diol, isophorone diisocyanate, and dimethylol butyric acid, stir and react at 87°C for 3 hours, add acetone to obtain product I, and ultrasonically disperse product I , followed by adding tannic acid and 1,4-butanediol to the ultrasonically dispersed product I at 68°C, stirring and refluxing for 5 hours, and naturally cooling to room temperature to obtain a polyurethane io...

Embodiment 3

[0075] This embodiment is applicable to the environmental protection phosphorus-free pretreatment solution of water-based paint, and is prepared from the following components and raw materials in mass percentage: modified water-based resin grafted nano-cellulose 22%, composite complexing agent 1.4%, retarder 0.2% etchant, 0.5% sodium nitrate, and deionized water as the balance.

[0076] Wherein, the modified water-based resin grafted nano-cellulose is modified water-based polyurethane grafted nano-cellulose, and the preparation method comprises the following steps:

[0077] Step (I): Mix polycaprolactone diol, isophorone diisocyanate, and dimethylol butyric acid, stir and react at 85°C for 3 hours, add acetone to obtain product I, and ultrasonically disperse product I , followed by adding tannic acid and 1,4-butanediol to the ultrasonically dispersed product I at 60°C, stirring and refluxing for 6 hours, and naturally cooling to room temperature to obtain a polyurethane ionome...

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Abstract

The invention relates to an environmentally friendly phosphorus-free pretreatment solution suitable for water-based paints and its preparation and application. The treatment solution is prepared from the following components and raw materials in mass percentage: modified water-based resin grafted with nano-cellulose 16-25%, compound complexing agent 0.8-1.8%, corrosion inhibitor 0.1-0.3%, sodium nitrate 0.4-0.6%, and the balance is deionized water. Compared with the prior art, the preparation of the pretreatment solution of the present invention is simple, and the substances used do not contain harmful substances such as phosphorus and chromium, and the environmental protection and economy are good, the film forming stability is good, and the bonding force with the water-based paint film is strong. And it has excellent corrosion protection performance, can effectively solve the technical problems such as poor film-forming property and poor bonding force with water-based paint film existing in the existing pretreatment liquid, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of water-based paints, and relates to an environmental-friendly phosphorus-free pretreatment liquid suitable for water-based paints and its preparation and application. Background technique [0002] Although traditional paints still occupy a large market share, water-based paints are a green industry and the future development direction of paints. Although water-based paints are superior to traditional oil-based paints in terms of environmental performance, due to performance, technology and other factors, the construction tolerance of water-based paints is far worse than that of oil-based paints, which often leads to unsatisfactory final paint film effects. For consumers, what they really buy is not the paint, but the painting effect after the paint is used. The jargon of "three-point paint, seven-point painting" is more appropriate to describe water-based paint. [0003] In the actual application of wate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D187/00C09D5/08C09D7/61C08G81/00
CPCC08G81/00C08L2205/03C09D5/08C09D187/005C09D7/61C08L5/08C08L97/005C08K3/28
Inventor 周建军俞梓恒周理腾
Owner 金华市鸿新新材料科技有限公司
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