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Real-time monitoring method for shrinkage volume of epoxy resin in curing process

A technology of epoxy resin curing and real-time monitoring, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as inapplicability, and achieve the effects of wide applicability, high test accuracy, and simple experimental devices

Inactive Publication Date: 2016-04-20
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] A common defect of the appeal method is that high-precision instruments are required, and the test can only be done in the laboratory, which cannot be applied in the actual production process

Method used

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  • Real-time monitoring method for shrinkage volume of epoxy resin in curing process
  • Real-time monitoring method for shrinkage volume of epoxy resin in curing process
  • Real-time monitoring method for shrinkage volume of epoxy resin in curing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for real-time monitoring of chemical shrinkage during epoxy resin curing, comprising the following steps:

[0036] (1) Fill the drop bottle equipped with a pipette (cleaned and dried in advance) and a temperature sensor with water into the water bath, fix it with a test tube clamp, then raise the temperature of the water bath to 60°C, and keep it warm for 5-10 minutes;

[0037] (2) Mix the epoxy resin system evenly in proportion, then use a vacuum oven to evacuate for 10 minutes, weigh 8.320g of resin and put it into a PE bag, drain the air inside the PE bag, and seal it with nylon rope. Use the same treatment method, weigh and pack in equal amounts;

[0038] (3) Then put the PE bag containing the sample and the resin PE bag of the control group into two droppers respectively at the same time, tighten the rubber stopper, and adjust the height of the liquid column in the pipette so that it is close to the 0 scale line;

[0039] (4) Start timing at the moment of...

Embodiment 2

[0042] A method for real-time monitoring of chemical shrinkage during epoxy resin curing, comprising the following steps:

[0043] (1) Fill the drop bottle equipped with a pipette (cleaned and dried in advance) and a temperature sensor with water into the water bath, fix it with a test tube clamp, then raise the temperature of the water bath to 70°C, and keep it warm for 5-10 minutes;

[0044] (2) Mix the epoxy resin system evenly in proportion, then use a vacuum oven to evacuate for 10 minutes, weigh 8.332g of resin and put it into a PE bag, drain the air inside the PE bag, and use nylon rope to separate and seal it. The epoxy resin of the control group Use the same treatment method, weigh and pack in equal amounts;

[0045] (3) Then put the PE bag containing the sample and the resin PE bag of the control group into two droppers respectively at the same time, tighten the rubber stopper, and adjust the height of the liquid column in the pipette so that it is close to the 0 sca...

Embodiment 3

[0049] A method for real-time monitoring of chemical shrinkage during epoxy resin curing, comprising the following steps:

[0050] (1) Fill the drop bottle equipped with a pipette (cleaned and dried in advance) and a temperature sensor with water into the water bath, fix it with a test tube clamp, then raise the temperature of the water bath to 80°C, and keep it warm for 5-10 minutes;

[0051] (2) Mix the epoxy resin system evenly in proportion, then use a vacuum oven to evacuate for 10 minutes, weigh 8.331g of resin and put it into a PE bag, drain the air inside the PE bag, and seal it with nylon rope. Use the same treatment method, weigh and pack in equal amounts;

[0052] (3) Then put the PE bag containing the sample and the resin PE bag of the control group into two droppers respectively at the same time, tighten the rubber stopper, and adjust the height of the liquid column in the pipette so that it is close to the 0 scale line;

[0053] (4) Start timing at the moment of...

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Abstract

The invention discloses a real-time monitoring method for shrinkage volume of epoxy resin in a curing process. The method comprises steps as follows: pipettes and temperature sensors are fixed at openings of dropping bottles through rubber plugs, the temperature is increased to the test temperature, and heat is preserved; a to-be-tested epoxy resin curing system is uniformly mixed and put into a PE (polyethylene) bag to serve as a to-be-tested group; epoxy resin with the same weight is taken and put into a PE bag to serve as a control group, the to-be-tested group and the control group are simultaneously put into the two dropping bottles respectively, and heights of liquid columns in the pipettes are adjusted to be in a 0 scale line; reading is performed according to the liquid level change of the pipettes; a volume change curve of the control group is subtracted from a volume change curve of the to-be-tested group, and a real-time chemical shrinkage curve of the to-be-tested epoxy resin during curing is obtained. The chemical shrinkage of the epoxy resin can be monitored in real time through addition of a control bottle on a traditional capillary dilatometer. Compared with the prior art, the method has the advantages of convenience, high accuracy, wide applicability, capacity of fully monitoring the resin curing process and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a real-time monitoring method for curing shrinkage volume of epoxy resin. Background technique [0002] Resin morphology development is one of the key factors in the molding process of composite materials, which will directly affect the properties of composite materials. The structure and performance of the same resin system under different curing conditions may vary greatly. During the curing process, the release of small molecules and the crosslinking reaction of the resin will reduce the volume of the resin, that is, chemical shrinkage, which will lead to defects such as cracks, warping or wrinkles inside the composite material. These defects will greatly reduce the performance of composite materials. Therefore, revealing the development of chemical shrinkage during curing is crucial for improving composite properties. During the curing process, the ep...

Claims

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Application Information

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IPC IPC(8): G01N33/44
CPCG01N33/442
Inventor 王继辉杨喜李书欣胡海晓
Owner WUHAN UNIV OF TECH
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