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Waterborne two-component zinc-rich special epoxy curing agent and preparation method thereof

An epoxy curing agent, water-based two-component technology, applied in the direction of epoxy resin coatings, coatings, anti-corrosion coatings, etc. Flash corrosion and other problems, achieve good flexibility and reaction rate, good wet adhesion, and improve the effect of protection ability

Pending Publication Date: 2020-01-10
HEBEI CHENYANG INDAL & TRADE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In summary, the water-based epoxy curing agent in the prior art has the following disadvantages: poor compatibility with water-based epoxy zinc-rich special resin; use organic acid to neutralize and form salt to improve hydrophilicity, but after adding organic acid components , the paint film is easy to produce flash corrosion on the metal, and it will also reduce the water resistance and salt spray resistance of the paint film; at present, most curing agents use salt spray, and the mechanical properties are slightly poor

Method used

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  • Waterborne two-component zinc-rich special epoxy curing agent and preparation method thereof
  • Waterborne two-component zinc-rich special epoxy curing agent and preparation method thereof
  • Waterborne two-component zinc-rich special epoxy curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Preparation of epoxy-terminated polymer

[0040] The formula is as follows:

[0041] Substance name mass, parts by mass PEG1000 210 Epoxy 828 (Shell) 160 potassium persulfate 1

[0042] Preparation:

[0043] Add PEG1000 and epoxy resin 828 into the reaction kettle, raise the temperature to 80°C under nitrogen atmosphere, and keep the temperature until the material becomes transparent; then add potassium persulfate dropwise to raise the temperature to 170°C, keep the temperature for 2 hours, and measure the theoretical epoxy value. When the epoxy value is qualified (epoxy value: 0.04-0.06), the temperature is lowered to obtain the epoxy-terminated polymer and put into a sealed and clean tank for later use.

[0044] 2. Prepare the first curing agent

[0045] The formula is as follows:

[0046]

[0047]

[0048] Preparation:

[0049] Add polyetheramine D-400 and tetrahydrophthalic anhydride to the reaction kettle, and keep wa...

Embodiment 2

[0057] 1. Preparation of epoxy-terminated polymer

[0058] The formula is as follows:

[0059] Substance name mass, parts by mass PEG2000 410 Bisphenol F epoxy resin 180 boron trifluoride 1

[0060] Preparation:

[0061] Add PEG2000 and bisphenol F epoxy resin into the reaction kettle, raise the temperature to 80°C under nitrogen atmosphere, and keep the temperature until the material becomes transparent; then add boron trifluoride to raise the temperature to 180°C, keep the temperature for 2 hours, measure the theoretical epoxy value. When the epoxy value is qualified (epoxy value: 0.04-0.06), the temperature is lowered to obtain an epoxy-terminated polymer, which is put into a sealed and clean tank for later use.

[0062] 2. Prepare the first curing agent

[0063] The formula is as follows:

[0064] Substance name mass, parts by mass Polyetheramine M-1000 240 Hexahydrophthalic anhydride 91 m-xylylenediamine 3...

Embodiment 3

[0074] 1. Preparation of epoxy-terminated polymer

[0075] The formula is as follows:

[0076] Substance name mass, parts by mass PEG1000 210 Epoxy 828 (Shell) 160 potassium persulfate 1

[0077] Preparation:

[0078] Add PEG1000 and epoxy resin 828 into the reaction kettle, raise the temperature to 80°C under nitrogen atmosphere, and keep the temperature until the material becomes transparent; then add potassium persulfate dropwise to raise the temperature to 170°C, keep the temperature for 2 hours, and measure the theoretical epoxy value. When the epoxy value is qualified (epoxy value: 0.03-0.04), the temperature is lowered to obtain the epoxy-terminated polymer and put into a sealed and clean tank for later use.

[0079] 2. Prepare the first curing agent

[0080] The formula is as follows:

[0081] Substance name mass, parts by mass Polyetheramine D-400 240 tetrahydrophthalic anhydride 91 m-xylylenediamine 3...

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Abstract

Belonging to the technical field of zinc-rich primer curing agents, the invention discloses a waterborne two-component zinc-rich special epoxy curing agent and a preparation method thereof. The methodincludes the steps of: (1) preparation of a first curing agent: a. reacting polyethylene glycol with epoxy resin under a catalytic condition to obtain an epoxy-terminated polymer; b. in a nitrogen atmosphere, putting acid anhydride into a special amine component for ring-opening reaction; c. adding a basic amine component into a product of the ring-opening reaction, and carrying out amine esterification reaction to obtain an amide polymer; and d. putting the epoxy-terminated polymer into the amide polymer, and adding an end-capping reagent for end capping to obtain the first curing agent; and(2) preparation of a second curing agent: under a catalytic condition, subjecting oleic acid and basic amine to dehydration polymerization into low molecular weight polyamide, thus obtaining the second curing agent. The curing agent provided by the invention can cooperate with waterborne epoxy resin to generate a paint film, which has the characteristics of good wet adhesion and excellent salt spray resistance, thus having good application prospects.

Description

technical field [0001] The invention relates to the technical field of zinc-rich primer curing agent, in particular to a water-based two-component zinc-rich special epoxy curing agent and a preparation method thereof. Background technique [0002] In recent years, the country's requirements for environmental protection have become more and more stringent, especially a series of regulations and policies have been issued for the control of VOC emissions. Water-based coatings have developed rapidly because they can greatly reduce or even completely eliminate the emissions of organic solvents and are safe to use. The main resin structure is the key factor for water-based coatings to achieve excellent product performance. At present, a large number of resin products have appeared in the water-based coating market, including: water-based alkyd resin, water-based epoxy resin, water-based acrylic resin, water-based polyurethane resin, water-based polyester resin, water-based hybrid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/44C09D163/00C09D5/10
CPCC08G59/44C09D5/106C09D163/00
Inventor 李辉宁刘树飞湛东东董立志
Owner HEBEI CHENYANG INDAL & TRADE GROUP CO LTD
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