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Preparation method of cardanol modified epoxy resin curing agent

A technology of epoxy resin curing and cardanol, applied in the chemical field, can solve problems such as poor low temperature curing effect, and achieve the effects of increased rigidity, good color retention, good mechanical properties and water resistance

Active Publication Date: 2015-07-29
ANHUI MEIDONG BIOLOGICAL MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of cardanol modified epoxy resin curing agent, described this method has solved the technical problem that the low temperature curing effect of modified epoxy resin curing agent in the prior art is not good

Method used

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  • Preparation method of cardanol modified epoxy resin curing agent

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Embodiment 1

[0013] 1. Add 300g of cardanol and 40g of sodium hydroxide solid into the autoclave, stir and heat up to 60 degrees Celsius, then slowly add 95g of chloroacetic acid in 30 minutes, react at 60 degrees Celsius for 4 hours after the addition, and cool down to room temperature , add 100g of water, wash, leave to stand for stratification, separate liquid to take the organic phase, vacuumize at 80 degrees Celsius for 4 hours, and discharge to obtain cardanol-based monobasic acid.

[0014] 2. Get 359g of cardanol-based monobasic acid and 146g of triethylenetetramine, heat up to 200 degrees Celsius, react at this temperature for 4 hours, cool down to 180 degrees Celsius, and obtain cardanol-modified epoxy resin curing agent after 3 hours of vacuuming H1.

[0015] Viscosity: 4600mPa.s Amine value: 350mgKOH / g, solid content: 98%. E51 / H1=100 / 60.

[0016] Surface hardness: 2H, adhesion: level 1, impact strength, 50kg.cm, bending: 1mm.

Embodiment 2

[0018] 1. Add 300g of cardanol and 40g of sodium hydroxide solid into the autoclave, stir and heat up to 60 degrees Celsius, then slowly add 95g of chloroacetic acid in 30 minutes, react at 60 degrees Celsius for 4 hours after the addition, and cool down to room temperature , add 100g of water, wash, leave to stand for stratification, separate liquid to take the organic phase, vacuumize at 80 degrees Celsius for 4 hours, and discharge to obtain cardanol-based monobasic acid.

[0019] 2. Get 359g of cardanol-based monobasic acid and 103g of diethylenetriamine, heat up to 200 degrees Celsius, react at this temperature for 4 hours, cool down to 180 degrees Celsius, and obtain cardanol-modified epoxy resin curing agent after evacuating for 3 hours H2.

[0020] Viscosity: 6000mPa.s Amine value: 303mgKOH / g, solid content: 98%. E51 / H2=100 / 80.

[0021] Surface hardness: H, adhesion: level 1, impact strength, 50kg.cm, bending: 1mm.

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Abstract

The invention discloses a preparation method of a cardanol modified epoxy resin curing agent. The method comprises steps as follows: cardanol and solid NaOH are added to a high-pressure reaction kettle and heated to the temperature of 60-80 DEG C, then chloroacetic acid is dropped slowly, the mixture reacts continuously at the temperature of 60-80 DEG C for 2-4 h after dropping, and cardanol monoacid is obtained through washing, standing, liquid separation and vacuumizing; the cardanol monoacid and polyamine are weighed out, heated to the temperature of 180-200 DEG C for a reaction for 4-6 h, cooled to the temperature of 150-180 DEG C and vacuumized, and the cardanol modified epoxy resin curing agent is obtained. According to the method, the cardanol and the chloroacetic acid have a substitution reaction firstly, the cardanol monoacid is obtained, then the prepared cardanol monoacid and the polyamine are polymerized, and the cardanol modified epoxy resin curing agent which is excellent in performance and low in toxicity is obtained.

Description

Technical field: [0001] The invention relates to the field of chemical industry, in particular to a modified epoxy resin curing agent, in particular to a preparation method of a cardanol-modified epoxy resin curing agent. Background technique: [0002] In the field of heavy-duty anti-corrosion, epoxy resin plays a pivotal role. Its wide use and excellent performance are indispensable varieties of heavy-duty anti-corrosion coatings. One of the important factors affecting the curing performance of epoxy resin is the matching curing agent. The choice of curing agent plays a decisive role in the use effect of epoxy resin coatings. Polyamide curing agent has high viscosity and poor curing at low temperature; polyamine curing agent reacts too fast, has large heat release, short service life, is volatile, and has high toxicity; alicyclic curing agent reacts slowly, Generally, accelerators need to be added to cure at room temperature; phenalkamine curing agents have poor weather re...

Claims

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Application Information

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IPC IPC(8): C07C231/02C07C235/10C08G59/54
Inventor 黎炘宋学良周大程
Owner ANHUI MEIDONG BIOLOGICAL MATERIAL