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Preparation method of novel cardanol modified epoxy resin

A technology of epoxy resin and cardanol, which is applied in the direction of organic chemistry, can solve the problems of insufficient heat resistance and poor weather resistance, and achieve the effects of improved solvent resistance, strong reactivity, and improved stability

Pending Publication Date: 2021-01-22
ZHEJIANG WANSHENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main variety of epoxy resin is bisphenol A epoxy resin, the shortcomings of toughness, poor weather resistance and insufficient heat resistance are the shortcomings of bisphenol A epoxy resin

Method used

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  • Preparation method of novel cardanol modified epoxy resin
  • Preparation method of novel cardanol modified epoxy resin
  • Preparation method of novel cardanol modified epoxy resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Add 70g of refined cardanol and 0.5g of azobisisobutyronitrile into the reactor, stir and mix evenly, and pre-pass N 2 To protect the entire reaction system, raise the temperature to 110°C and keep it warm for 2 hours;

[0029] 2) Add diethyl sulfate-phosphoric acid system (DES-H 3 PO 4 ) 4g, continue to pass N 2 Protection, heating up to 170°C, keeping warm for 4 hours, removing N after the reaction 2 , and then cooled down to room temperature to obtain cardanol low self-polymer;

[0030] 3) Add 40g of epichlorohydrin and 0.8g of tetraethylammonium bromide to the cardanol low self-polymer prepared by step 2), raise the temperature to 65°C, stir for 60min, and slowly add 48% NaOH solution dropwise 32g, control the dripping in 1.5 hours, after the dripping, raise the temperature to 70°C, keep the temperature for 1h;

[0031] 4) Control the temperature at 70°C and the pressure at 5Kpa, and distill the product prepared by step 3) under reduced pressure, and remove ...

Embodiment 2

[0034] 1) Add 150g of refined cardanol and 3.0g of azobisisoheptanonitrile into the reactor, stir and mix evenly, pass N in advance 2 To protect the entire reaction system, raise the temperature to 115°C and keep it warm for 1.5h;

[0035] 2) Add diethyl sulfate-sulfuric acid system (DES-H 2 SO 4 ) 10g, continue to pass N 2 Protect and heat up to 190°C, keep warm for 2 hours, remove N after the reaction is over 2 , and then cooled down to room temperature to obtain cardanol low self-polymer;

[0036] 3) Add 100g of epichlorohydrin and 2g of tetraethylammonium bromide to the cardanol low self-polymer prepared in step 2), raise the temperature to 75°C, stir for 60min, and slowly add 80g of 48% NaOH solution dropwise , control the dripping in 3 hours, after the dripping, the temperature is raised to 70°C, and the temperature is kept for 2 hours;

[0037] 4) Control the temperature at 75°C and the pressure at 8Kpa, and distill the product prepared by step 3) under reduced pre...

Embodiment 3

[0040] 1) Add 100g of refined cardanol and 1.0g of azobisisobutyronitrile into the reactor, stir and mix evenly, pass N in advance 2 To protect the entire reaction system, raise the temperature to 120°C and keep it warm for 1 hour;

[0041] 2) Add diethyl sulfate-phosphoric acid system (DES-H 3 PO 4 ) 6g, continue to pass N 2 Protect and heat up to 200°C, keep warm for 3 hours, remove N after the reaction is over 2, and then cooled down to room temperature to obtain cardanol low self-polymer;

[0042] 3) Add 60g of epichlorohydrin and 1.2g of tetraethylammonium bromide to the cardanol low self-polymer prepared by step 2), raise the temperature to 75°C, stir for 60min, and slowly add 48% NaOH solution dropwise 48g, control the dripping in 2 hours, after the dripping, raise the temperature to 75°C, keep the temperature for 1.5h;

[0043] 4) Control the temperature at 75°C and the pressure at 8Kpa, and distill the product prepared by step 3) under reduced pressure, and remov...

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Abstract

The invention discloses a preparation method of novel cardanol modified epoxy resin, which belongs to the technical field of preparation of epoxy resin, and particularly comprises the steps of addinga mixture of cardanol and azobisisobutyronitrile or azobisisoheptonitrile into a reactor, heating to react, then adding a diethyl sulfate-phosphoric acid system (DES-H3PO4) or a diethyl sulfate-sulfuric acid system (DES-H2SO4), heating for reaction to obtain an intermediate product cardanol oligomer, after the temperature of the intermediate product is reduced to room temperature, adding epoxy chloropropane and tetraethylammonium bromide, uniformly mixing, heating for reaction, slowly dropwise adding a 48% NaOH solution, carrying out reduced pressure distillation, and filtering to obtain a final product. The novel epoxy resin prepared by the method is good in toughness, low in viscosity and good in chemical resistance and heat resistance, the performance of the novel epoxy resin is superior to that of a common epoxy resin product, and the novel epoxy resin utilizes the renewable resource cardanol and is green, environmentally friendly, low in cost and multipurpose.

Description

technical field [0001] The invention relates to the technical field of preparation of epoxy resins, in particular to a preparation method of a novel cardanol-modified epoxy resin. Background technique [0002] Epoxy resin is a thermosetting polymer resin that can form a three-dimensional network structure through curing reaction. Epoxy resin has no small molecules to escape during the curing process, so it has a low shrinkage rate during the curing reaction process, and the viscosity of the cured product is low. It has good adhesion, heat resistance, chemical resistance, mechanical properties and electrical properties, so epoxy resin has always been considered as one of the most important thermosetting resins. Epoxy resins are widely used in the bonding of various metals and non-metals, corrosion-resistant coatings, electrical insulation materials, various resin-based composite materials and other fields. It plays a pivotal role in many fields such as electronics, electrici...

Claims

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Application Information

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IPC IPC(8): C07D301/28C07D303/27
CPCC07D301/28C07D303/27
Inventor 王铮顾奇吴亚蕾
Owner ZHEJIANG WANSHENG
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