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Cashew novolac epoxy resin and preparation method thereof

A technology for phenolic epoxy resin and cashew phenolic resin, which is applied in the field of preparation of cardanol phenolic epoxy resin, can solve the problems of unstable performance, narrow ratio range, short pot life and the like, and achieves abundant and cheap raw materials, simple and convenient preparation method, The effect of mild reaction conditions

Inactive Publication Date: 2013-04-03
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN101508865A uses cardanol as the main component to prepare solvent-free cardanol epoxy heavy-duty anti-corrosion paint, which overcomes the shortcomings of general epoxy resins such as high toxicity, short pot life, and narrow proportioning range.
Studies have shown that the cardanol polyoxyethylene ether has the characteristics of a surfactant, but because the cardanol is a mixture and the side chain is an unsaturated alkane, the performance is unstable and cannot meet the application requirements

Method used

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  • Cashew novolac epoxy resin and preparation method thereof
  • Cashew novolac epoxy resin and preparation method thereof
  • Cashew novolac epoxy resin and preparation method thereof

Examples

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preparation example Construction

[0030] The preparation method of this epoxy resin is realized through the following steps:

[0031] In the first step, under the action of a catalyst, react cardanol and formaldehyde at 70-100°C for 2-4 hours, wash with water, stand to separate layers, remove the water layer, and distill under reduced pressure to remove the remaining water to obtain a brown-red liquid cashew phenolic resin . Among them, the catalyst is any one of zinc acetate, oxalic acid, hydrochloric acid, and barium hydroxide, and the dosage is 1% to 3% of the mass of cardanol; formaldehyde is an aqueous solution with a mass concentration of 37%, and the dosage is 1% of the mass of cardanol. 0.5~1.0 times.

[0032] In the second step, under the catalysis of the quaternary ammonium salt, the above-mentioned cashew phenolic resin is reacted with epichlorohydrin at 80-120° C. for 4-5 hours. Wherein, the quaternary ammonium salt catalyst is benzyltriethylammonium chloride, tetramethylammonium chloride, tetrae...

Embodiment 1

[0036] In a four-neck flask equipped with a thermometer, a stirrer and a condenser, add 150.0g of cardanol and 4.5g of zinc acetate respectively, raise the temperature to 90°C under stirring, and slowly add 32.5g of 37% zinc acetate dropwise within 1h. Formaldehyde aqueous solution, reflux reaction for 3 hours, the product was washed with hot water, allowed to stand for stratification, the water layer was removed, and the remaining water was distilled off under reduced pressure to obtain a brown-red liquid cashew nut phenolic resin.

[0037]Add 100.0g of cashew phenolic resin, 308.4g of epichlorohydrin and 3.0g of benzyltriethylammonium chloride into a four-necked bottle equipped with a thermometer, agitator and condenser, stir and heat up to 100°C, and react for 4h. Then the temperature was lowered to 70°C, a total of 13.4 g of solid NaOH was added in batches within 2 hours, and the reaction was continued for 2 hours. Then wash with hot water until neutral, and distill off ex...

Embodiment 2

[0039] Add 150.0g of cardanol and 4.5g of zinc acetate to a four-necked flask equipped with a thermometer, a stirrer and a condenser tube, raise the temperature to 100°C under stirring, and slowly add 32.5g of 37% zinc acetate dropwise within 1 hour. Formaldehyde aqueous solution, reflux reaction for 3 hours, the product was washed with hot water, allowed to stand for stratification, the water layer was removed, and the remaining water was distilled off under reduced pressure to obtain a brown-red liquid cashew nut phenolic resin.

[0040] Add 100.0g of cashew phenolic resin, 308.4g of epichlorohydrin and 3.0g of benzyltriethylammonium chloride into a four-necked bottle equipped with a thermometer, agitator and condenser, stir and heat up to 100°C, and react for 4h. Then the temperature was lowered to 70°C, a total of 14.0 g of solid NaOH was added in batches within 2 hours, and the reaction was continued for 2 hours. Then wash with hot water until neutral, and distill off exc...

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Abstract

The invention discloses a cashew novolac epoxy resin and a preparation method thereof. The preparation method comprises the following steps in sequence: reacting anacardol with formaldehyde under the effect of a catalyst, so as to obtain reddish-brown liquid cashew novolac resin; reacting the cashew novolac resin with epichlorohydrin for 4 hours at 80 to 120 DEG C under the catalyzing effect of quaternary ammonium salt; cooling the reactant to reach 70 DEG C; respectively adding alkali at 8 to 12 times within 2 hours; reacting for 1 to 6 hours at 70 to 90 DEG C; washing with hot water until appearing neutral; standing to stratify; removing the water layer; and reducing the pressure and distilling to remove excessive epichlorohydrin, so as to obtain the reddish-brown liquid novolac epoxy resin of which the epoxy value is of 0.17 to 0.23eq / 100g. The preparation method is simple and convenient, and the reaction condition is mild; and the prepared cashew novolac epoxy resin is the polyfunctional epoxy resin with both benzene ring and long alkyl chain, combines the high thermal stability of phenolic resin and the hyperresponsiveness of the epoxy resin, and is applicable to ecological plastics and coatings.

Description

technical field [0001] The invention relates to a biomass-based epoxy resin and a manufacturing method thereof, in particular to a preparation method of a cashew nut novolac epoxy resin. Background technique [0002] In recent years, with the gradual depletion of non-renewable resources such as oil and coal, the energy crisis has become increasingly serious, and the development and utilization of renewable resources has attracted widespread attention from all over the world. Among them, the preparation of polymer materials from biomass resources has attracted more and more attention from academia and industry. Epoxy resin has many advantages such as excellent physical, mechanical and electrical insulation properties, bonding properties with various materials, and flexible use process. It can be made into coatings, adhesives, and polymer composite materials, and is widely used in various fields of the national economy. Applications. However, the general-purpose bisphenol A ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/08
Inventor 孔振武霍淑平陈健吴国民刘贵锋
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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