Light-colored cardanol alkyl ether epoxy curing agent and preparation method thereof

A cardanol alkyl ether, epoxy curing agent technology, applied in the direction of coating, can solve the problems of darkening, easy oxidation color, etc., and achieve the effect of improving toughness and good color stability

Inactive Publication Date: 2012-05-02
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to solve the problem in the prior art that the direct use of cardanol is easy to oxidize and make the color darker, the invention provides a light-

Method used

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  • Light-colored cardanol alkyl ether epoxy curing agent and preparation method thereof
  • Light-colored cardanol alkyl ether epoxy curing agent and preparation method thereof
  • Light-colored cardanol alkyl ether epoxy curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] The preparation method of this light-colored cardanol alkyl ether epoxy curing agent is: mix 1 mole of cardanol alkyl ether and 1-3 moles of polyamine, then add 1-3 moles of formaldehyde in batches, and control the reaction temperature at React at 80-90°C for 4 hours, then increase the temperature to 100-120°C to distill out the water produced by the reaction, and finally keep the temperature at 80-120°C and distill under reduced pressure until no moisture is evaporated. The cardanol alkyl ether is obtained through Mannich reaction Epoxy curing agent.

[0028] In the preparation method of the above-mentioned light-colored cardanol epoxy curing agent, the structure of the cardanol alkyl ether used is as follows:

[0029] Where m is an integer from 0 to 22, where n is 0, 1, or 2.

[0030] In the preparation method of the above-mentioned light-colored cardanol epoxy curing agent, the polyamine used can be ethylenediamine, hexamethylenediamine, dihexyltriamine, diethylenetriamine...

Example Embodiment

[0033] Example 1

[0034] Add 316 g of cardanol methyl ether (1 mole, Nanjing Science and Technology Development Corporation of Forest Chemical Research Institute) and 309 g (3 moles, Suzhou Xinxin Chemical Co., Ltd.) of diethylene triamine into 2000 equipped with agitator, thermometer and reflux condenser. In a three-necked flask, add 37% formaldehyde solution 243g (3 moles, Nanjing Chemical Reagent Factory) in batches within 0.5 hours, control the reaction temperature at 80-90°C for 4 hours, and then heat to 100-120°C. The water produced by the reaction is pressure-evaporated, and finally the temperature is maintained at 80-120°C under reduced pressure until no water is evaporated, and 207g of water is evaporated. The obtained light yellow oily cardanol methyl ether epoxy curing agent 641g, amine value 383mg / g, yield 97%.

Example Embodiment

[0035] Example 2

[0036] Add 358g of cardanol butyl ether (1 mole, Nanjing Science and Technology Development Corporation of Forest Chemical Research Institute) and 189g (1 mole, Hangzhou Jiaxing Chemical Co., Ltd.) of tetraethylenepentamine into 1000 with agitator, thermometer and reflux condenser. Add 30g of paraformaldehyde (1 mol, Nanjing Chemical Reagent Factory) in 0.5 hour in a three-necked flask, control the reaction temperature at 80-90°C for 4 hours, and then heat to 100-120°C for atmospheric steaming The water produced by the reaction is removed, and finally the temperature is maintained at 80-120° C. and the temperature is kept at 80-120° C. and then distilled under reduced pressure until no water is evaporated, and 69 g of water is evaporated. 537 g of a light yellow oily cardanol butyl ether epoxy curing agent was obtained, the amine value was 481 mg / g, and the yield was 96%.

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Abstract

The invention provides a light-colored cardanol alkyl ether epoxy curing agent and a preparation method thereof, the cardanol alkyl ether epoxy curing agent prepared by the method, and a cured object formed by the curing agent and an epoxy resin. The preparing method comprises the steps of: mixing 1 mol of cardanol alkyl ether and 1-3 mol of polyamine; then adding 1- 3 mol of formaldehyde in batch, and controlling a reaction temperature between 80 DEG C and 90 DEG C and reacting for 4 hours; next, heating to 100-120 DEG C and evaporating water generated by reaction; at last, retaining at 80-120 DEG C, distilling at a reduced pressure till no moisture is evaporated; and obtaining the cardanol alkyl ether epoxy curing agent through Mannich reaction. The curing agent obtained by the invention is relatively light in color and non-discoloring after long-time storage; in addition, mixture of the curing agent and the epoxy resin encounters phase separation in curing, so that the impact strength of the cured object is improved, and the flexibility of material is reinforced.

Description

technical field [0001] The invention relates to a preparation method of an epoxy resin curing agent, in particular to a light-colored cardanol alkyl ether epoxy curing agent capable of curing-induced phase separation and a preparation method thereof. Background technique [0002] Cardanol is a cashew nut shell cardanol is a natural biophenol with a 15-carbon long carbon chain in the meta-position of a monohydric phenol structure. Cardanol is non-toxic and non-corrosive, which is different from petroleum phenol, which is highly corrosive and highly toxic. It is more friendly to the environment and human body. Its structure is as follows: [0003] [0004] where n is 0, 1 or 2. [0005] Cardanol has a wide range of uses and can be used in phenolic resins, epoxy resin curing agents, surfactants and demulsifiers. However, the phenolic hydroxyl group of cardanol is extremely easy to be oxidized by air into quinone derivatives, resulting in a very dark color of cardanol or d...

Claims

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Application Information

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IPC IPC(8): C08G59/50C09D7/12
Inventor 夏建陵张燕黄坤陈瑶李梅杨小华万厉
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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