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Method for reducing volatile matter content in resin

A technology of volatile matter and measurement method, applied in the field of composite materials, can solve the problems that affect the subsequent use of resin, increase the viscosity of the system, and slowly increase the curing degree of the resin, and achieve high volatile matter removal efficiency, small impact on subsequent use, and simultaneous reduction. The effect of efficiency

Active Publication Date: 2020-06-23
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1) Low solvent removal efficiency
The solvent in the resin can be quickly removed by vacuuming in the early stage, but as the solvent content of the surface resin decreases, the viscosity of the system increases, and the resin crust on the surface hinders the volatilization of the bottom solvent, resulting in a sharp drop in solvent removal efficiency;
[0004] 2) Affect the subsequent use of the resin
In order to speed up the volatilization of the solvent, the temperature of the oven is set at about 60°C when vacuuming, and the general removal time is 16-24 hours to meet the requirements of the hot melt method for preparing resin prepregs, but the long-term high-temperature treatment will reduce the curing degree of the resin. Increase slowly, affecting the curing performance of the resin

Method used

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  • Method for reducing volatile matter content in resin
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  • Method for reducing volatile matter content in resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Step 1: Start the three-roll grinder, control the gap between the front roll and the second roll at 0.1mm, leave the scraper away from the surface of the rear roll, and slowly pour a certain amount of phenolic phenolic resin between the front roll and the second roll of the three-roll grinder, and the phenolic The amount of resin is to cover the gap and be flush with the highest point of the front roller;

[0061] Step 2: Test the volatile matter content of the resin every 30 minutes, and adjust the roller spacing according to the volatile matter content. The test method for the volatile content in phenolic resin is to take out 10-20g of phenolic resin, spread it flat on the measuring paper, and measure the mass as m1. Put the resin and weighing paper into an oven, set the temperature at 100°C, take it out after 10 minutes, and measure its mass as m2. The content of volatile matter in the resin is (m1-m2) / m1%. When the volatile content of resin is 30-40%, the distance...

Embodiment 2

[0065] Step 1: Start the three-roll grinder, control the gap between the front roll and the second roll at 0.1mm, leave the scraper away from the surface of the rear roll, and slowly pour a certain amount of phenolic phenolic resin between the front roll and the second roll of the three-roll grinder, and the phenolic The amount of resin is to cover the gap and be flush with the highest point of the front roller;

[0066] Step 2: Test the volatile matter content of the resin every 30 minutes, and adjust the roller spacing according to the volatile matter content. The test method for the volatile content in phenolic resin is to take out 10-20g of phenolic resin, spread it flat on the measuring paper, and measure the mass as m1. Put the resin and weighing paper into an oven, set the temperature at 100°C, take it out after 10 minutes, and measure its mass as m2. The content of volatile matter in the resin is (m1-m2) / m1%. When the volatile content of resin is 30-40%, the distance...

Embodiment 3

[0070] Step 1: Start the three-roll grinder, control the gap between the front roll and the second roll at 0.1mm, leave the scraper away from the surface of the rear roll, and slowly pour a certain amount of phenolic phenolic resin between the front roll and the second roll of the three-roll grinder, and the phenolic The amount of resin is to cover the gap and be flush with the highest point of the front roller;

[0071] Step 2: Test the volatile matter content of the resin every 30 minutes, and adjust the roller spacing according to the volatile matter content. The test method for the volatile content in phenolic resin is to take out 10-20g of phenolic resin, spread it flat on the measuring paper, and measure the mass as m1. Put the resin and weighing paper into an oven, set the temperature at 100°C, take it out after 10 minutes, and measure its mass as m2. The content of volatile matter in the resin is (m1-m2) / m1%. When the volatile content of resin is 30-40%, the distance...

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Abstract

The invention provides a method for reducing the content of volatile matters in resin. The method comprises the following steps: step 1, arranging a multi-roll assembly, which at least comprises two press rolls; step 2, placing resin between any set of adjacent pressing rollers of the multi-roller assembly, and controlling multiple pressing rollers of the multi-roller assembly to roll, wherein thetemperature of any pressing roller is lower than the resin curing temperature; and step 3, measuring the content of volatile matters in the resin between the adjacent pressing rollers according to set time, and adjusting the distance between the adjacent pressing rollers according to the content of the volatile matters before the content of the volatile matters meets the use requirement, whereinthe content of the volatile matters is in negative correlation with the distance. The method provided by the invention is simple and feasible, the volatile matter removal efficiency is high, the subsequent use of the obtained resin is not influenced, and the technical problems in an existing resin volatile matter removal method are solved.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a method for reducing volatile content in resin. Background technique [0002] Resin (usually refers to phenolic resin) may have excessively reacted phenolic substances. At the same time, a certain amount of solvent needs to be mixed in for the convenience of discharging during the production process. This is the main component of volatile components in phenolic resin. The resin can be directly prepared into a prepreg by a wet method, and then dried to remove the solvent in the prepreg. However, with the development of composite material technology, due to the poor quality stability of wet prepregs and the difficulty in meeting environmental protection requirements, the process of preparing prepregs by wet methods has gradually been replaced by prepregs prepared by melting methods. However, most of the resins on the market still contain a large amount of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/04C08L61/06
CPCC08G8/04C08L61/06
Inventor 张帅欧秋仁陈超李阳王璐
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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