A kind of modified graphene waterborne polyurea resin and its preparation method and application

A polyurea resin, alkene water-based technology, applied in the field of water-based coatings, can solve problems such as poor dispersion, poor stability, inability to achieve modification effect, and promote metal corrosion, achieve good adhesion, improve mechanical properties and anti-corrosion properties, The effect of enhancing dispersibility and stability

Active Publication Date: 2022-03-25
SHANGHAI UNIV OF ENG SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the agglomeration phenomenon caused by the high specific surface area of ​​graphene leads to poor dispersion and stability in the coating. In addition, due to the conductive structure of graphene π-π conjugation, agglomeration is prone to occur, and the agglomerated graphene will make The electrical conductivity of the coating increases by several orders of magnitude. Once the coating has defects, graphene will promote metal corrosion and cannot be used for long-term corrosion protection. These defects prevent graphene from being used in polyurea coatings to achieve the desired modification effect

Method used

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  • A kind of modified graphene waterborne polyurea resin and its preparation method and application
  • A kind of modified graphene waterborne polyurea resin and its preparation method and application

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Embodiment

[0053] 1) Preparation of sulfonated graphene

[0054] At 0 ~ 5 ℃, 5g flake graphite powder (300 mesh), 3.6g KNO 3 and 150mL 98%H 2 SO 4 Mix well, then slowly add 8g KMnO 4 , then react at 35°C for 6 hours, then at 0-5°C, slowly add 250 mL of deionized water (about 30 minutes), keep the reaction for 10 hours, and then slowly add the resulting mixture to 600 mL, 10wt% of H 2 O 2 , stirred for 1 hour, left standstill for 24 hours, filtered, and the filter cake was repeatedly washed to neutrality with 5wt% dilute hydrochloric acid and deionized water, and then freeze-dried in a freezer to obtain a brown spongy solid, which was graphene oxide (GO). ).

[0055] The prepared graphene oxide (GO) was directly added to 100ml of deionized water, stirred at room temperature for 24 hours to make it evenly dispersed in deionized water, and then ultrasonically peeled off with an ultrasonic cell pulverizer for 1 hour to fully pulverize and peel, centrifuge. Separate and remove the preci...

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Abstract

The invention discloses a modified graphene waterborne polyurea resin as well as a preparation method and application thereof. The modified graphene water-based polyurea resin is made of isocyanate-modified sulfonated graphene in an organic solvent and first reacts with isophorone diisocyanate, then reacts with polyetheramine, and then extends with polyetheramine chain extender. Chain reaction, then react with hydrophilic chain extender, then neutralize with neutralizing agent, finally add deionized water to disperse evenly and remove organic solvent to obtain, the isocyanate modified sulfonated graphene is obtained by isocyanate Modified sulfonated graphene. The water-based polyurea coating prepared by applying the modified graphene water-based polyurea resin of the present invention is environmentally friendly, convenient in construction, good in coating adhesion, not easy to peel off, and has excellent mechanical properties and anti-corrosion properties.

Description

technical field [0001] The invention relates to a modified graphene water-based polyurea resin, a preparation method thereof and an application in the water-based polyurea coating, belonging to the technical field of water-based coatings. Background technique [0002] Coatings play an increasingly important role in people's lives and have become an indispensable material for the development of modern society. Polyurea coatings have been widely used in high-speed railways, bridges, oil and natural gas pipelines and other projects because of their solvent-free and pollution-free properties, excellent anti-corrosion, waterproof and wear-resistant properties. [0003] Polyurea coatings include one-component polyurea coatings and two-component polyurea coatings. The current mainstream polyurea coatings are mainly two-component polyurea coatings. Although the two-component polyurea coating has excellent performance, during its construction, due to the need to effectively control...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/73C08G18/66C08G18/50C08G18/10C08G18/32C09D175/02C09D7/61
CPCC08G18/755C08G18/73C08G18/5024C08G18/10C09D175/02C09D7/61C08K2003/2241C08L2205/02C08G18/3228C08L75/04C08K3/22
Inventor 张继嘉王继虎温绍国朱雨婷李思为王静
Owner SHANGHAI UNIV OF ENG SCI
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