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Preparation and degradation methods of hot-melt phenolic resin and composite material thereof

A technology of phenolic resin and composite materials, which is applied in the preparation and degradation of hot-melt phenolic resin and its composite materials, in the field of hot-melt phenolic resin and its composite materials, and can solve the problems of low reaction temperature and poor heat resistance stability. Achieve the effects of excellent mechanical properties, easy control of the production process, and low energy consumption

Active Publication Date: 2021-09-24
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The synthesis method is simple, the reaction temperature is low, and overcomes the defect that the phenolic hydroxyl and methylene groups of the phenolic resin in the prior art are easy to be thermally broken and degraded, resulting in poor thermal stability , the prepared hot-melt phenolic resin has good heat resistance and mechanical properties

Method used

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  • Preparation and degradation methods of hot-melt phenolic resin and composite material thereof
  • Preparation and degradation methods of hot-melt phenolic resin and composite material thereof
  • Preparation and degradation methods of hot-melt phenolic resin and composite material thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] First put 95.6g of molten phenol into the flask, add 75.1g of 37wt% formaldehyde solution and 4.15g of potassium carbonate while stirring, slowly heat up to 98°C and reflux, react for 1.5 hours, cool down to 45°C, add 30.5g of phenylboronic acid g, then slowly heat up to the reaction system boiling reflux, reflux for 1 hour, start dehydration under reduced pressure, when the temperature of desolventization reaches 46 ° C, add modifier quartz sand 3g, toughening agent polyvinyl butyral 0.6g, Continue vacuuming to remove the solvent to obtain a hot-melt phenolic resin. Resin heat resistance such as figure 2 .

[0061] Take out the frozen hot-melt phenolic resin, place it in a blast oven at 60°C and heat it for 30 minutes to make it flow freely, pour it into the double rollers of the hot-melt prepreg machine, the film-forming temperature is 65°C, The film-forming line speed is 2 m / min, and the resin film is made. Composite the resin film and the basalt fiber cloth, the...

Embodiment 2

[0066] First put 95.6g of molten phenol into the flask, add 24.7g of paraformaldehyde and 5.3g of sodium carbonate while stirring, slowly heat up to 98°C and reflux, react for 2 hours, cool down to 56°C, add 27.2g of p-tolueneboronic acid g, then slowly warming up to the boiling reflux of the reaction system, reflux for 1 hour, and start dehydration under reduced pressure. When the temperature of desolventization reaches 48°C, add 5g of modifier aluminum hydroxide and 0.4g of toughening agent polyetherimide, Continue vacuuming to remove the solvent to obtain a hot-melt phenolic resin.

[0067] The hot-melt phenolic resin was cured at a constant temperature of 160° C. for 2 hours, and then at a constant temperature of 180° C. for 6 hours to obtain a cured product of the hot-melt phenolic resin. Immerse it in the degradation solution of ethanol and water (mass ratio: 3:1), heat at 90°C for 90 minutes, the degradation of the hot-melt phenolic resin is completed, and remove the so...

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Abstract

The invention provides preparation and degradation methods of hot-melt phenolic resin and a composite material thereof, and relates to the technical field of high polymer materials and chemical recovery thereof. The preparation method of the hot-melt phenolic resin comprises the following specific steps of: carrying out heating reaction on a phenolic compound and an aldehyde compound under the action of a catalyst, cooling, adding arylboronic acid and a derivative thereof, heating, boiling and refluxing again, carrying out decompression dehydration after the reaction is finished, adding a modifier and a flexibilizer, and vacuumizing to obtain the hot-melt phenolic resin. The preparation method of the hot-melt phenolic resin-based composite material comprises the following steps of: preparing a resin adhesive film from the hot-melt phenolic resin by adopting a hot-melt preimpregnation method, compounding the resin adhesive film with a fiber reinforcement body, and carrying out hot-pressing treatment to obtain the hot-melt phenolic resin-based composite material. The hot-melt phenolic resin and the hot-melt phenolic resin-based composite material are heated and decomposed in an ethanol or acetone solvent, and can be degraded and recycled. The preparation process is simple to operate and low in energy consumption, the production process is easy to control, and large-batch continuous production can be realized. The degradation process is safe, environment-friendly, green and pollution-free.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and their chemical recovery, and specifically relates to a hot-melt phenolic resin and its composite material. The invention also provides a method for preparing and degrading a hot-melt phenolic resin and its composite material suitable for industrial production . Background technique [0002] As one of the three synthetic thermosetting resins, phenolic resin has good mechanical properties, excellent heat resistance and ablation resistance, corrosion resistance, flame retardancy, etc., and has been widely used in rail transit, electronics, aerospace and other fields . However, the phenolic hydroxyl groups and methylene groups of phenolic resins are easily degraded by thermal fracture, which limits their large-scale applications in the fields of ablation-resistant materials. Moreover, the three-dimensional network structure of phenolic resin after solidification makes it neither dissol...

Claims

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Application Information

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IPC IPC(8): C08G8/28C08J5/24C08L61/14
CPCC08G8/28C08J5/24C08J2361/14Y02W30/62
Inventor 张以河张力殷鹏刚
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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