CN-122011310-A - Preparation method of cardanol modified thermosetting phenolic resin

Abstract

The invention discloses a preparation method of cardanol modified thermosetting phenolic resin, which comprises the following steps: in order to improve the toughness of the phenolic resin, the invention provides a toughening method of the phenolic resin, because cardanol contains a plurality of hydroxyl groups and a long carbon chain structure, the cardanol can participate in the crosslinking reaction of a phenolic resin system in a multi-dimensional manner, the crosslinking structure of the system is changed, the comprehensive mechanical property of the system is effectively improved, and the toughness of the material can be greatly improved. The toughening resin can be applied to the industries of laminated boards, copper-clad plates and the like. The preparation method comprises the steps of adding phenol, cardanol and a catalyst into a reaction kettle, heating to 70-90 ℃ for reaction, adding a terminator after detecting that the cardanol content is less than 1%, cooling to 50-60 ℃, adding phenol, formaldehyde and an alkaline catalyst into the reaction kettle, starting stirring, heating to 70-95 ℃, carrying out heat preservation reaction until the free aldehyde is less than 1%, carrying out vacuum dehydration until the viscosity is qualified, and adding a solvent to regulate the solid content, thus obtaining the cardanol modified thermosetting phenolic resin.

Inventors

• ZHENG CHAO
• LV ZHANMEI
• TANG WENDONG
• ZHANG XIANLAI
• ZHENG JINXIA
• HOU XIAOQIAN

Assignees

• 山东东润新材料有限公司

Dates

Publication Date

20260512

Application Date

20260331

Claims (4)

1. 1. The preparation method of the cardanol modified thermosetting phenolic resin is characterized by comprising the following steps of: Adding phenol, cardanol and a catalyst into a reaction kettle, heating to 70-90 ℃ for reaction, detecting that the cardanol content is less than 1%, and adding a terminator, and secondly, cooling the reaction kettle to 50-60 ℃, adding phenol, formaldehyde and an alkaline catalyst, starting stirring, heating to 70-95 ℃, carrying out heat preservation for reaction until the free aldehyde is less than 1%, carrying out vacuum dehydration until the viscosity is qualified, and adding a solvent for regulating the solid content to obtain the cardanol modified thermosetting phenolic resin.
2. 2. The method for preparing a cardanol modified thermosetting phenol resin of claim 1, wherein the cardanol is refined cardanol, crude cardanol or at least one structure.
3. 3. The preparation method of the cardanol modified thermosetting phenolic resin of claim 1, wherein the mass ratio of phenol to 42% formaldehyde to cardanol is 100:120-180:80-120.
4. 4. The method for preparing cardanol modified thermosetting phenolic resin of claim 1, wherein the basic catalyst is ammonia water, ethylenediamine, triethylamine or at least one structure.

Description

Preparation method of cardanol modified thermosetting phenolic resin Technical Field The invention relates to a preparation method of phenolic resin, belongs to the field of polymer chemistry, and in particular relates to a preparation method of cardanol modified thermosetting phenolic resin. Background Phenolic resin (phenolic resin) is generally a polymer material obtained by dehydration-condensation of a phenol and formaldehyde solution as raw materials under heated acidic or alkaline conditions. With the continuous development of industrial technology, the requirements of composite material performance are also increasing. The cured products of the pure phenolic resins have high brittleness and are limited in various application fields. Therefore, the phenolic resin is toughened and modified to improve the mechanical property, which is still a hot spot for research of current domestic and foreign scholars and also determines the future development direction of the phenolic resin. Phenolic resin has high brittleness and low elongation, and phenolic hydroxyl and methylene on the structure of the phenolic resin are easy to oxidize. In order to meet the requirements of copper-clad plates, aviation, aerospace and other high-end fields on the performance of phenolic resin, toughening modification and heat-resistant modification are required. In the existing modified phenolic resin, biomass toughening becomes a mainstream toughening mode. The rapid development of information technology and electronic products has put forward higher technical performance requirements on copper-clad plates, and various copper-clad plates using high-performance resin as a matrix are continuously developed (such as MPPO, PTFE, CE, BMI, PMR, PCH and the like), but still cannot meet the complete requirements (such as cost, performance, process and the like). Accordingly, development of various high-performance resin matrices based on new phenol resins has been sought. When the resin matrix is used as a high-performance material in practical application, two technical problems of ① improving the processability of the resin by copolymerization, blending or other modes and solving the problems of high brittleness, easy fracture and the like caused by solid phase high-temperature curing and forming are solved, and ② ensures that the material has high enough heat resistance, mechanical property and mechanical strength, improves toughness and prepares a chemical product integrating excellent performances such as strength, toughness, heat resistance and processability. The common chemical modifier is polyethylene glycol, polyurethane prepolymer, polyvinyl acetal, carboxyl nitrile rubber and the like, and the common method improves the toughness of the phenolic resin condensate to a certain extent, but the thermosetting materials such as composite materials, heat insulation materials and the like have higher requirements on toughness, so the preparation method of the cardanol modified thermosetting phenolic resin is provided. Disclosure of Invention The invention aims to provide a more efficient toughening method for phenolic resin, and the cardanol of the method can participate in the crosslinking reaction of a phenolic resin system in a multi-dimensional way due to the fact that the cardanol contains a plurality of hydroxyl groups and a long carbon chain structure, so that the crosslinking structure of the system is changed, the comprehensive mechanical property of the system is effectively improved, and the toughness of materials can be greatly improved. In order to achieve the above purpose, the present invention adopts the following technical scheme: the preparation method of the cardanol modified thermosetting phenolic resin comprises the following steps: Adding phenol, cardanol and a catalyst into a reaction kettle, heating to 70-90 ℃ for reaction, detecting that the cardanol content is less than 1%, and adding a terminator, and secondly, cooling the reaction kettle to 50-60 ℃, adding phenol, formaldehyde and an alkaline catalyst, starting stirring, heating to 70-95 ℃, carrying out heat preservation for reaction until the free aldehyde is less than 1%, carrying out vacuum dehydration until the viscosity is qualified, and adding a solvent for regulating the solid content to obtain the cardanol modified thermosetting phenolic resin. Preferably, the cardanol is refined cardanol, crude cardanol or at least one structure. Preferably, the mass ratio of the phenol to the 42% formaldehyde to the cardanol is 100:80-120:60-80. Preferably, the basic catalyst is ammonia water, ethylenediamine, triethylamine, or at least one structure. Compared with the prior art, the invention has the beneficial effects that: 1. According to the preparation method of the cardanol modified thermosetting phenolic resin, cardanol is used as a modifier, the modified resin system has a plurality of action sites caused by a plurality of structures because the modified