Preparation method of salt-fog-resistant polyaspartic acid ester, salt-fog-resistant polyaspartic acid ester and coating

An aspartate and salt spray-resistant technology, applied in the preparation of salt spray-resistant polyaspartate, salt spray-resistant polyaspartate and coatings, can solve the problem of poor hydrophobicity and water resistance , Poor salt spray resistance and poor salt spray resistance of coatings, to achieve the effect of improving water resistance and salt spray resistance, long construction period, excellent water resistance and salt spray resistance

Active Publication Date: 2022-07-08
SHENZHEN FEIYANG JUNYAN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the molecular weight of polyaspartic acid ester is small, and the content of ester bonds in the molecule is high. The hydrophobicity and water resistance of the polyaspartic ester coating prepared after reacting with isocyanate are not good, resulting in relatively poor salt spray resistance of the coating. Poor, mainly because the salt spray itself is a supersaturated water mist state, the poor hydrophobicity and water resistance of the polyaspartate coating will make the salt spray more likely to penetrate the paint film and cause corrosion, so it is limited by salt resistance Poor fog performance, polyaspartic ester coatings are difficult to popularize and apply in construction machinery anticorrosion, ship anticorrosion and other heavy anticorrosion fields

Method used

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  • Preparation method of salt-fog-resistant polyaspartic acid ester, salt-fog-resistant polyaspartic acid ester and coating
  • Preparation method of salt-fog-resistant polyaspartic acid ester, salt-fog-resistant polyaspartic acid ester and coating
  • Preparation method of salt-fog-resistant polyaspartic acid ester, salt-fog-resistant polyaspartic acid ester and coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Take a 1L four-necked flask, add 514g (1mol) of F530 polyaspartate, 30.2g (0.1mol) of NX-2024 cardanol resin, 0.3g (0.001mol) of tetraisopropyl titanate, then stir and heat up to 100°C, under the relative vacuum of -0.095MPa, under reduced pressure distillation reaction for 2 hours to obtain salt spray-resistant polyaspartate;

[0044]The obtained salt spray-resistant polyaspartate had a secondary amine group equivalent of 263.5 and a viscosity of 1800 mPa·s (25° C.).

Embodiment 2

[0046] Take a 1L four-necked flask, add F520 polyaspartate 582g (1mol), LITE-2020 cardanol resin 68.8g (0.2mol), dibutyltin oxide 0.74g (0.003mol), then stir and heat up to 120 ℃, under the relative vacuum degree of -0.095MPa, the vacuum distillation reaction is carried out for 3 hours to obtain the salt spray-resistant polyaspartic acid ester;

[0047] The secondary amine group equivalent of the obtained salt spray-resistant polyaspartate was 321, and the viscosity was 3350 mPa·s (25° C.).

Embodiment 3

[0049] Take a 1L four-necked flask, add F530 polyaspartate 514g (1mol), NX-2024 cardanol resin 75.5g (0.25mol), tetraisopropyl titanate 0.58g (0.002mol), then stir and heat up to 100°C, under the relative vacuum of -0.095MPa, under reduced pressure distillation reaction for 5 hours to obtain salt spray-resistant polyaspartate;

[0050] The secondary amine group equivalent of the obtained salt spray-resistant polyaspartate was 309, and the viscosity was 3200 mPa·s (25° C.).

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Abstract

The invention relates to the field of polyaspartic acid ester, and particularly discloses a preparation method of salt-fog-resistant polyaspartic acid ester, the salt-fog-resistant polyaspartic acid ester and a coating. The preparation method comprises the following steps: mixing polyaspartic acid ester, cardanol resin and a catalyst together for transesterification, controlling the temperature to be 100-130 DEG C, controlling the relative vacuum degree to be-0.095 to-0.1 Mpa, and stirring for reacting for 2-5 hours to obtain salt-fog-resistant polyaspartic acid ester; wherein the molar ratio of the polyaspartic acid ester to the cardanol resin to the catalyst is as follows: the polyaspartic acid ester to the cardanol resin to the catalyst is 1: (0.1-0.3): (0.001-0.003), and the catalyst is tetraisopropyl titanate or dibutyltin oxide. The polyaspartic acid ester prepared by the invention has excellent water resistance and salt spray resistance, and is low in viscosity and long in operable time during construction.

Description

technical field [0001] The application relates to the field of polyaspartic acid esters, in particular to a preparation method of salt spray resistant polyaspartic acid ester, salt spray resistant polyaspartic acid ester and coatings. Background technique [0002] Polyaspartate resin is prepared by Michael reaction of aliphatic or alicyclic diamine or polyamine with maleate or fumarate. Polyaspartate is usually used in the field of coatings. Polyaspartate coatings are made by mixing polyaspartate and isocyanate. Compared with general amino resins, polyaspartate resins are The reaction speed of isocyanate is slower, the reason is that maleate or fumarate has steric hindrance and inductive effect, which can effectively delay the reaction speed of polyaspartate resin and isocyanate, so the obtained polyaspartic acid Ester paint has a longer construction time, and its paint construction methods can be spraying, rolling, scraping, etc., without the need for professional and expe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/00C09D175/02C09D5/08
CPCC08G18/329C09D175/02C09D5/08
Inventor 吕文章罗善锴赵粕利蔡水生邱小勇朱龙晖何飞云
Owner SHENZHEN FEIYANG JUNYAN TECH DEV
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