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A kind of toughening type waterborne epoxy curing agent and its preparation method and application

A water-based epoxy and toughening technology, applied in the direction of epoxy resin coatings, coatings, etc., can solve problems such as no good, achieve good stability and construction performance, good hydrophilicity, simple process effect

Active Publication Date: 2022-04-22
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no good solution to the aforementioned problems, and there is an urgent need for a curing agent with good water dispersion performance, good compatibility with epoxy resin, and good flexibility.

Method used

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  • A kind of toughening type waterborne epoxy curing agent and its preparation method and application
  • A kind of toughening type waterborne epoxy curing agent and its preparation method and application
  • A kind of toughening type waterborne epoxy curing agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 100g of dimer acid was injected into the kettle, then 135g of epoxy resin E51 was injected, the catalyst triphenylphosphine was added after stirring uniformly, and the material was discharged after constant temperature reaction at 100°C for 3 hours to obtain toughened epoxy resin A1. Wherein, the molar ratio of the total amount of epoxy groups in the epoxy resin to the total amount of carboxyl groups in the dimer acid is n1=2:1.

Embodiment 2-4

[0060] According to the method in Preparation Example 1, toughened epoxy resins were prepared respectively, denoted as A2, A3, and A4, and the reaction conditions were shown in Table 2:

[0061] Table 2. Different reaction conditions in preparation examples 1-4

[0062]

[0063] [Example 1] (ie S1)

[0064] Follow these steps to prepare a waterborne epoxy hardener:

[0065] Step A. Add 80g epoxy resin E51 and 20g toughening epoxy resin A1 to the beaker, stir evenly, add 300g isophorone diamine to the reaction flask, and preheat the temperature to 80°C; The resin component was gradually dropped into the reaction bottle for ring-opening reaction. The dropping time was 2 hours, and the temperature was kept for 1 hour after the dropwise addition. Then, the materials in the reaction bottle were distilled under reduced pressure by using a vacuum pump, and the excess isocyanide in the reaction system was removed. Phoronediamine removal.

[0066] Step B, then add 35g propylene g...

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Abstract

The invention discloses a toughened water-based epoxy curing agent and its preparation method and application. The curing agent is prepared from the following raw materials in parts by weight: 1 part of epoxy resin; 0.65-6 parts of polyamine compound; 0.1-1 part of toughened epoxy resin; 0.25-1.25 part of monoepoxy reactive diluent; 0.2-1 part of alkyl polyethylene glycol monoglycidyl ether. In the present invention, the epoxy curing agent has good hydrophilic property, good flexibility and good compatibility with epoxy resin, and its paint film has excellent salt spray resistance and water resistance when preparing epoxy resin coating , toughness, and strong adhesion, high hardness.

Description

technical field [0001] The invention relates to an epoxy curing agent, in particular to a toughening type waterborne epoxy curing agent and a preparation method and application thereof, belonging to the technical field of waterborne epoxy coatings. Background technique [0002] Epoxy resin coatings have excellent adhesion, mechanical properties and chemical resistance, and are widely used in coating anti-corrosion, civil engineering, adhesives and other fields. With the increasingly urgent requirements for environmental protection, the research on water-based epoxy coatings is an important trend in the development of today's coatings. The epoxy resin reacts with a suitable curing agent to form a three-dimensional network structure to have good mechanical properties and anti-corrosion properties. Therefore, the curing agent is the key to the application value of epoxy resin. As a water-based anti-corrosion coating, epoxy resin has many common problems such as brittleness, po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/50C09D163/02
CPCC08G59/5026C08G59/502C08G59/5033C08G59/504C09D163/00
Inventor 亓淑源纪学顺沈潇斌晋云全武泰恒郝宝祥
Owner WANHUA CHEM GRP CO LTD