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Water-based epoxy curing agent and preparation method thereof

A water-based epoxy and curing agent technology, applied in the field of water-based epoxy curing agent and preparation, can solve the problems of easy damage, poor impact resistance, etc., to improve mechanical properties, improve impact resistance and flexibility, and improve leveling effect of effect

Inactive Publication Date: 2018-12-25
HAOLISEN COATING SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thanks to its excellent anti-corrosion performance and good adhesion to the substrate, water-based epoxy has always been the first choice for primers. However, due to its strong cohesion and rigidity, epoxy primers also have poor impact resistance and are prone to corrosion. Defects such as damage and related issues have always been a research hotspot for industry technicians

Method used

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  • Water-based epoxy curing agent and preparation method thereof
  • Water-based epoxy curing agent and preparation method thereof
  • Water-based epoxy curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of 2,4-TDI modified with MPEG

[0028] The specific formula is as follows:

[0029]

[0030]

[0031] Mix the dehydrated MPEG-1000 with methyl isobutyl ketone in advance, add 2,4-TDI (2,4-toluene diisocyanate ) into the four-necked bottle, drop the mixed solution into the four-necked bottle, control the reaction temperature at 40-48°C, and complete the dropwise addition in about 2 hours. After the dropwise addition, raise the temperature to 50-55°C and keep it warm for 2 hours, then test the NCO content , the NCO content is 3.6%, the index is qualified, and it will be used after being filled with nitrogen for protection. The reaction equation is shown in formula II, wherein the average value of n is in the range of 10-35.

Embodiment 2

[0033] Preparation of curing agent containing compound of formula I

[0034] The specific formula is as follows:

[0035] Substance name

[0036] In a four-necked flask equipped with a thermometer, a stirring paddle, and a condenser tube, m-xylylenediamine was added to the four-necked flask and the temperature was raised to 20-35°C, and the resin of Example 1 was added dropwise to the four-necked flask to control the temperature 20-35°C, about 2 hours to complete the dropwise addition. After the dropwise addition, raise the temperature to 60-65°C and keep it warm for 2 hours, remove methyl isobutyl ketone under reduced pressure, add a mixture of deionized and propylene glycol butyl ether to dilute and adjust the viscosity under high-speed dispersion. The desired product was obtained at 80% solids. Its reaction is shown in formula III.

Embodiment 3

[0038] Preparation and Application of Ordinary Waterborne Epoxy Primer

[0039] The specific characteristics of the emulsion formula are as follows:

[0040] Substance name

Parts by mass (g)

WP-6520 Waterborne Epoxy Resin

128

R-900 titanium dioxide

62

ASP-200 Kaolin

20

ZPA antirust pigment

20

MA-7 carbon black

2

3168 defoamer

0.15

TEGO-755W additive

5

Propylene glycol butyl ether

7

Embodiment 2 curing agent

18

K-54

1

[0041] According to the formula shown in the table, the water-based epoxy primer is prepared by staged high-speed stirring. The WP-6520 water-based epoxy resin in the table is the self-made water-based epoxy resin of HLS Company. R-900 titanium dioxide is a commercially available product from DuPont, MA-7 is a commercially available carbon black from Mitsubishi, ASP-200 kaolin is a commercially available product from BASF, ZPA is a comme...

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Abstract

The invention relates to a water-based epoxy curing agent and a preparation method thereof. The water-based epoxy curing agent is obtained by reacting a product, obtained from a reaction between 2,4-TDI and MPEG, with m-xylylenediamine. The water-based epoxy curing agent and the preparation method thereof have the advantages that EO chain segments and amine in the structure of the curing agent provide corresponding hydrophilicity for emulsification of the curing agent, so that the curing agent can be effectively hydrophilic; aromatic diamine and a rigid structure on the 2,4-TDI provide high lipophilicity and corrosion resistance for the curing agent; introduction of the aromatic diamine can effectively enhance the corrosion and heat resistance effect of paint films; introduction of the MPEG can effectively improve related mechanical properties; the impact resistance, the flexibility and the levelling effect of the paint films are improved effectively.

Description

[technical field] [0001] The invention relates to a water-based epoxy curing agent and a preparation method. [Background technique] [0002] In the field of coatings, low VOC emissions and water-based solvent-based coatings have become an irreversible trend. However, compared with solvent-based coatings, the lack of performance of water-based coatings greatly limits the promotion and use of water-based coatings. How to overcome the shortcomings of water-based coatings has become the focus of many researchers. Thanks to its excellent anti-corrosion performance and good adhesion to the substrate, water-based epoxy has always been the first choice for primers. However, due to its strong cohesion and rigidity, epoxy primers also have poor impact resistance and are prone to corrosion. Defects such as damage and related issues have always been a research hotspot for industry technicians. [Content of the invention] [0003] The main purpose of the present invention is to provid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/54C08G65/333
CPCC08G59/54C08G65/33313C08G65/33358
Inventor 柳昀刘薇薇周贤王杰陈维建曹猛杜怀凯
Owner HAOLISEN COATING SHANGHAI
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