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Synthesis method of cardanol-based epoxy resin

A cardanol-based epoxy resin and a synthetic method technology, applied in the field of synthesis of cardanol-based epoxy resin, can solve the problems of difficult control of reaction conditions, increased preparation cost, and difficult product separation, and achieve convenient preparation and epoxy resin Effect with high value and simple response

Inactive Publication Date: 2016-01-13
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, the preparation of cardanol epoxy resin by inorganic base is disclosed, and the reaction conditions of the synthesis method are not easy to control, the system is easy to produce a large amount of emulsified products, the product separation is difficult, and the process is complicated, so that the preparation cost is increased.

Method used

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  • Synthesis method of cardanol-based epoxy resin
  • Synthesis method of cardanol-based epoxy resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] step one

[0025] The side chain double bond of cardanol-thiol click chemical reaction: put 3.00g of cardanol and 0.86g of mercaptoethanol in a quartz flask, blow nitrogen, irradiate with ultraviolet light for 6 hours, and distill under reduced pressure at 100°C to get cashew nuts Hydroxylation product I of phenolic side chain double bond, such as figure 1 shown;

[0026] step two

[0027] Epoxidation reaction: 3.78g cardanol side chain double bond hydroxylation product I was added together with 4.15g potassium carbonate and 52.94g dioxane into a 100mL three-necked flask, and the temperature was raised to 60°C with nitrogen gas. Stir at a speed of 1 / min, add dropwise 2.13g epichlorohydrin in 10 minutes, keep warm for 2 hours, filter, and the filtrate obtains cardanol-based epoxy resin through decompression distillation, such as figure 2 Shown, epoxy value: 0.36mol / 100g.

Embodiment 2

[0029] step one

[0030] The side chain double bond of cardanol-thiol click chemical reaction: put 3.00g of cardanol and 1.72g of mercaptoethanol in a quartz flask, blow nitrogen, irradiate with ultraviolet light for 2 hours, and distill under reduced pressure at 90°C to get cashew nuts phenolic side chain double bond hydroxylation product II;

[0031] step two

[0032] Epoxidation reaction: 4.56g cardanol side chain double bond hydroxylation product II, 6.22g potassium carbonate and 52.94g dioxane were added together into a 100mL three-necked flask, the temperature was raised to 90°C by nitrogen gas, and the temperature was increased at 1000 rpm Stir at a speed of 1 / min, add 3.33g epichlorohydrin dropwise in 20 minutes, keep the temperature for 4 hours, filter, and the filtrate is distilled under reduced pressure to obtain the cardanol-based epoxy resin, epoxy value: 0.42mol / 100g.

Embodiment 3

[0034] step one

[0035] The side chain double bond of cardanol-thiol click chemical reaction: put 3.00g of cardanol and 2.34g of mercaptoethanol in a quartz flask, blow nitrogen, irradiate with ultraviolet light for 1 hour, and distill under reduced pressure at 80°C to get cashew nuts phenolic side chain double bond hydroxylation product III;

[0036] step two

[0037] Epoxidation reaction: Add 5.32g cardanol side chain double bond hydroxylation product III together with 8.29g potassium carbonate and 52.94g dioxane into a 100mL three-necked flask, heat up to 100°C with nitrogen gas, and Stir at a speed of 1 / min, add dropwise 4.44g epichlorohydrin in 30 minutes, keep warm for 6 hours, filter, and the filtrate is distilled under reduced pressure to obtain cardanol-based epoxy resin, epoxy value: 0.49mol / 100g.

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Abstract

The invention discloses a synthesis method of cardanol-based epoxy resin. The synthesis method of the cardanol-based epoxy resin comprises the following steps that (a) side chain double bond-mercaptan click chemical reaction of cardanol is performed: the cardanol and mercaptoethanol are weighed in certain proportion in a quartz flask, nitrogen gas is led to perform ultraviolet irradiation for a certain time, and then reduced pressure distillation is performed to obtain a cardanol side chain double bond hydroxylation product; (b) epoxidation reaction is performed: the cardanol side chain double bond hydroxylation product, potassium carbonate and dioxane are weighed in certain proportion and then are added into a three-mouth flask, nitrogen gas is led to perform heating and high-speed stirring, epoxy chloropropane weighed according to the mole ratio is added dropwise, reflux reaction is performed for a certain time, filtration is performed, and filtrate undergoes reduced pressure distillation to obtain the cardanol-based epoxy resin. The cardanol-based epoxy resin prepared by means of the synthesis method, is high in epoxide number, can be blended with most of other types of epoxy resin in use and can be also cross-linked and blended with amino resin, polyester resin and the like in use.

Description

technical field [0001] The present invention relates to a kind of synthetic method of epoxy resin, specifically relate to a kind of synthetic method of cardanol-based epoxy resin. Background technique [0002] Due to the active epoxy groups in the molecular structure of epoxy resins, they can cross-link with various types of curing agents to form insoluble polymers with a three-way network structure. Cured epoxy resin has excellent chemical resistance, low shrinkage, high bonding strength, high mechanical strength, and excellent electrical insulation, so it is widely used in coatings, adhesives, inks and other fields. However, the raw material oil for the production of epoxy resin is a one-time resource, and the price of oil continues to rise, resulting in an increase in production costs. At the same time, its products are more brittle and poor in toughness and weather resistance. [0003] Cashew nut shell liquid is a by-product of the cashew nut processing industry, which...

Claims

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Application Information

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IPC IPC(8): C08G59/04
Inventor 陈钦慧姚蕾蕾肖雪清夏建荣林金火
Owner FUJIAN NORMAL UNIV
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