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Preparation method of modified phenolic resin and modified phenolic resin prepared by preparation method

A phenolic resin and modification technology, applied in the field of polymer synthesis and modification, can solve the problems of low boron content of resin, poor reactivity of boric acid, limited heat resistance of resin, etc., and achieve low cost, good environmental protection benefit, good resistance thermal effect

Active Publication Date: 2015-03-25
沙县宏盛塑料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reactivity of boric acid in this method is poor, the boron content in the resin is low, and the heat resistance of the prepared resin is limited.

Method used

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  • Preparation method of modified phenolic resin and modified phenolic resin prepared by preparation method
  • Preparation method of modified phenolic resin and modified phenolic resin prepared by preparation method
  • Preparation method of modified phenolic resin and modified phenolic resin prepared by preparation method

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preparation example Construction

[0023] Further, the preparation method of modified phenolic resin of the present invention, comprises the steps:

[0024] 1) Add the organoboron compound and excess aldehyde into the reaction kettle, stir evenly, adjust the pH of the reaction solution to 8-12 with alkali, raise the temperature to 80-120°C, and react for 1-4h;

[0025] 2) Add phenol, cardanol and an acidic catalyst to the reaction solution in step 1), adjust the pH to 1-2, and react at a temperature of 90-120°C for 1-6h;

[0026] 3) After dehydration, the modified phenolic resin is obtained.

[0027] Further, the organoboron compound is preferably triphenylboronate, 2-aminoethyl diphenylboronate, L-norvalyl diphenylboronate and L-cysteinyl diphenylboronate One or more of phenyl borates. Each triphenyl borate has 9 active sites, which can generate 1-9 substituted triphenyl borates; each diphenyl borate-2-aminoethyl ester has 8 active sites, which can generate 1-8 substituted diphenylboronic acid-2-aminoethyl ...

Embodiment 1

[0038] 1) Mix 35kg of triphenyl borate, 79kg of formaldehyde solution with a mass concentration of 37% and 0.4kg of sodium hydroxide, heat up to 80°C, and react for 1h;

[0039] 2) Add 94kg of phenol, 17kg of cardanol and 1.2kg of oxalic acid to the reaction solution in step 1), and react for 2 hours at a temperature of 90°C;

[0040] 3) After dehydration, the modified phenolic resin is obtained.

[0041] After testing, the obtained modified phenolic resin is mainly composed of molecules with the following structural formula:

[0042]

[0043] Wherein, m, n, k, and d represent the degree of polymerization, which are integers greater than or equal to 0 that are not necessarily equal, and m, n, and k represent the repeated numbers of phenol groups, cardanol groups, and organoboron segments respectively, d represents the number of repetitions of chain segments that do not necessarily contain the above three groups connected to each other at the same time; R 1 and R 4 It is ...

Embodiment 2

[0045]1) Mix 21kg of 2-aminoethyl diphenyl borate, 80kg of 37% formaldehyde solution and 0.3kg of sodium hydroxide, heat up to 100°C, and react for 1h;

[0046] 2) Add 94kg of phenol, 20kg of cardanol and 0.9kg of hydrochloric acid to the reaction solution in step 1), and react for 3 hours at a temperature of 95°C;

[0047] 3) After dehydration, the modified phenolic resin is obtained.

[0048] After testing, the obtained modified phenolic resin is mainly composed of molecules with the following structural formula:

[0049]

[0050] Wherein, m, n, k, and d represent the degree of polymerization, which are integers greater than or equal to 0 that are not necessarily equal, and m, n, and k represent the repeated numbers of phenol groups, cardanol groups, and organoboron segments respectively, d represents the number of repetitions of chain segments that do not necessarily contain the above three groups connected to each other at the same time; R 1 and R 4 It is the termina...

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Abstract

The invention provides a preparation method of modified phenolic resin and modified phenolic resin prepared by the preparation method. By adopting organic boron and anacardol for double modification of phenolic resin, the preparation method comprises the following steps: firstly, carrying out reaction on an organic boron compound and excessive aldehyde under an alkaline condition to generate hydroxymethylated organic boron; then adding phenol, anacardol and an acidic catalyst; carrying out reaction under an acidic condition at 90-120 DEG C for 1-6 hours; and dehydrating to obtain the modified phenolic resin. The modified phenolic resin prepared by the method has good heat resistance and toughness and low cost and further has a good environmental benefit.

Description

technical field [0001] The invention relates to the technical field of polymer synthesis and modification, in particular to a preparation method of a modified phenolic resin and a modified phenolic resin prepared by the method. Background technique [0002] Phenolic resins are widely used in composite materials, coatings, friction materials, adhesives and other fields due to their excellent heat resistance, flame retardancy, electrical insulation and mechanical properties. With the rapid development of the industrial economy, higher requirements are put forward for phenolic resins. For higher heat resistance, better mechanical properties, better friction properties, etc., various modified phenolic resins have appeared. Research reports, such as heat-resistant modification, reinforcement modification, toughening modification, etc., mainly include boron modification, silicon modification, molybdenum modification, rubber modification, benzoxazine modification, polyamide modific...

Claims

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Application Information

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IPC IPC(8): C08G8/28
Inventor 罗建峰黄世俊陈银桂朱光明翟苏宇
Owner 沙县宏盛塑料有限公司
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