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Method for modifying phenolic resin with cardanol and rubber

A rubber-modified, phenolic resin technology, applied in the field of using cardanol and rubber-modified phenolic resin, can solve the problems of poor stability of compatible resins, complicated processes, large solvent environment pollution, etc., and achieve flexibility and heat resistance. Excellent, simple process, excellent compatibility effect

Active Publication Date: 2020-05-15
ZHEJIANG HANGMO SYNTHETIC MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Most of the existing rubber-modified phenolic resins are physically mixed, and physical mixing is prone to poor compatibility and resin stability;
[0006] 2. In the existing rubber chemical grafting process, it is often necessary to add a solvent to the reaction system, and the solvent pollutes the environment; in addition, the process is complicated and requires the precipitation, filtration and purification of the product.

Method used

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  • Method for modifying phenolic resin with cardanol and rubber
  • Method for modifying phenolic resin with cardanol and rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Put 1000kg of preheated and molten phenol into the high-level metering tank with a special pump, and measure it into the reaction kettle, then add 150kg of neoprene, 10kg of cardanol, and 0.2kg of sodium thiosulfate. After rising to 100°C, add 2.5kg of oxalic acid as a catalyst, stir evenly, add 700kg of 37% formaldehyde solution dropwise, and complete the dropwise addition within 1 hour. After the heat preservation is over, raise the temperature of normal pressure dehydration to 160-170°C, vacuum dehydration to 180°C (vacuum degree is less than 0.09Mpa), stop the reaction, release the product, and obtain 1204kg of light yellow transparent solid resin after cooling.

Embodiment 2

[0051] Put 1000kg of preheated and molten phenol into the high-level metering tank with a special pump, and then add 50kg of nitrile rubber, 100kg of cardanol, and 0.5kg of dibenzoyl peroxide, heat up to 80°C and keep it warm for 2 hours After the temperature rises to 100°C, add 1.2kg of catalyst p-toluenesulfonic acid, stir evenly, add 730kg of 37% formaldehyde solution dropwise, and complete the dropwise addition within 1 hour. After the dropwise addition of formaldehyde is completed, keep the temperature at 100°C for 2 hours . After the heat preservation is over, raise the temperature of normal pressure dehydration to 160-170°C, vacuum dehydration to 180°C (vacuum degree is less than 0.09Mpa), stop the reaction, release the product, and obtain 1126kg of light yellow transparent solid resin after cooling.

Embodiment 3

[0053]Put 1000kg of preheated molten phenol into the high-level metering tank with a special pump, and then add 100kg of styrene-butadiene rubber, 200kg of cardanol, and 0.5kg of lauryl peroxide. After the temperature rises to 100°C, add 1.0kg of sulfuric acid, stir evenly, add 760kg of 37% formaldehyde solution dropwise, and complete the dropwise addition within 1 hour. After the dropwise addition of formaldehyde, keep the temperature at 100°C for 3 hours. After the heat preservation is over, raise the temperature of normal pressure dehydration to 160-170°C, vacuum dehydration to 180°C (vacuum degree is less than 0.09Mpa), stop the reaction, release the product, and obtain 1274kg of light yellow transparent solid resin after cooling.

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Abstract

The invention discloses a method for modifying phenolic resin with cardanol and rubber. The method comprises the following steps: (1) carrying out an addition reaction on double bonds on the side chain of cardanol and rubber alpha carbon under the action of an initiator by using raw material phenol as a solvent in order to obtain a mixture of phenol and cardanol-grafted rubber; (2) adding formaldehyde and an acidic catalyst into the mixture, and carrying out a condensation polymerization reaction on the phenol, the cardanol-grafted rubber and the formaldehyde in the mixture; and (3) carrying out vacuum dehydration to 180 DEG C under the condition that the vacuum degree is less than 0.09 Mpa, stopping the reaction, and discharging to obtain phenolic resin modified with cardanol and rubber.The method provided by the invention can significantly improve the wear resistance, flexibility, compatibility and storage stability of the phenolic resin, and the method adopts a solvent-free process, meets the environmental protection requirements, and does not pollute the environment. In addition, the method is simple in process and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of phenolic resin products, in particular to a method for modifying phenolic resin with cardanol and rubber. Background technique [0002] Phenolic resin (PF) is the earliest synthetic resin. It has the characteristics of easy to obtain raw materials, convenient synthesis, manufacturability, thermal performance and electrical insulation performance. It is widely used in electronics, fireproof coatings, refractory materials, aerospace vehicles and advanced composite materials. field has been widely used. [0003] With the continuous advancement of industrial technology, traditional phenolic resins have poor heat resistance and high brittleness due to the easy oxidation of phenolic hydroxyl groups and methylene groups on the molecular structure, which largely limits their application in high-performance materials. Therefore, it needs to be modified to obtain excellent oxidation resistance and heat resistance;...

Claims

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Application Information

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IPC IPC(8): C08G8/28
CPCC08G8/28
Inventor 周大鹏陈利王松松吴忆彤王海龙徐利彬孟付良
Owner ZHEJIANG HANGMO SYNTHETIC MATERIAL