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Test method for solidification volume change of thermosetting resin

A technology of volume change and resin curing, applied in the direction of material thermal expansion coefficient, etc., can solve the problems of small amount of resin, large dispersion of experimental results, large error of capillary method, etc., to reduce curing shrinkage, improve overall quality, and eliminate curing residual stress Effect

Active Publication Date: 2012-06-27
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two methods cannot reflect the shrinkage of the resin curing process in a full and real-time manner, and the amount of resin used in the test is small, and the error of the capillary method is relatively large. The experimental results are highly discrete.

Method used

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  • Test method for solidification volume change of thermosetting resin
  • Test method for solidification volume change of thermosetting resin
  • Test method for solidification volume change of thermosetting resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 30ml of volume transfer agent to two identical glass measuring cylinders 1 with precise graduations; then add 5g of medium temperature curing epoxy resin 4 to volume transfer agent 3 in one of the measuring cylinders; The cylindrical glass cylinder 2 of size and weight is put into the glass measuring cylinder without added resin to be tested and the glass measuring cylinder added with the measured resin respectively, and the distance between the outer wall of the glass cylinder and the inner wall of the glass measuring cylinder is kept at 1 mm; At the same time, put it into a vacuum oven, evacuate for 30 minutes to remove the air in the volume transfer agent and the measured resin, and read the volume transfer agent without the measured resin and with the measured resin through the scale of the glass measuring cylinder after vacuum degassing. Initial volume; heat up to 80°C at a heating rate of 2°C / min, hold for 4 hours, heat up to 120°C at a heating rate of 2°C / min,...

Embodiment 2

[0037]Add 50ml of volume transfer agent to two identical glass measuring cylinders with precise scales; then add 10g of high-temperature curing epoxy resin to the volume transfer agent in one of the measuring cylinders; Put the cylindrical glass cylinders into the glass measuring cylinders without the measured resin and the glass measuring cylinders with the measured resin respectively, keep the distance between the outer wall of the glass cylinder and the inner wall of the glass measuring cylinder at 1 mm; complete the assembly of the experimental device, put the two sets of experimental devices into the vacuum at the same time Oven, vacuumize for 30 minutes to remove the air in the volume transfer agent and the measured resin, after vacuum degassing, read the initial volume of the volume transfer agent without the measured resin and after adding the measured resin through the scale of the glass measuring cylinder respectively; Raise the temperature to 180°C at a heating rate ...

Embodiment 3

[0039] Add 40ml of volume transfer agent to two identical glass measuring cylinders with precise graduations; then add 8g of bismaleimide resin to the volume transfer agent in one of the measuring cylinders; and the weight of the cylindrical glass cylinder were placed into the glass measuring cylinder without the measured resin and the glass measuring cylinder with the measured resin, and the distance between the outer wall of the glass cylinder and the inner wall of the glass measuring cylinder was kept at 1 mm; Put it into a vacuum oven, evacuate for 30 minutes to remove the air in the volume transfer agent and the measured resin, and read the initial volume of the volume transfer agent without the measured resin and with the measured resin through the scale of the glass measuring cylinder after vacuum degassing ;Heat up to 150°C at a heating rate of 2°C / min, hold for 1 hour, then raise the temperature to 160°C at a heating rate of 2°C / min, hold for 1 hour, then raise the tem...

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Abstract

The invention belongs to the research of solidification volume change feature of thermosetting resin and relates to a test method for researching the solidification volume change of the thermosetting resin. According to the test method, a high temperature resistant liquid medium which cannot carry out chemical reaction under high temperature is adopted as the volume transfer reagent, and the volume change original position of the thermosetting resin under full process temperature is recorded in the online and real-time manners. By researching the solidification volume change behavior of the typical thermosetting resin system, people can understand the volume change rules of different resin substrates in the solidification process, the solidification contraction of the thermosetting resin can be controlled by physical and chemical measures, so that the experimental proof is provided for improving the overall quality of composite material workpiece manufacturing.

Description

technical field [0001] The invention belongs to the research on the curing volume change characteristics of thermosetting resins, and relates to a test method for studying the curing volume changes of thermosetting resins by using a volume transfer method. Background technique [0002] Advanced composite materials, especially fiber-reinforced thermosetting resin-based composite materials, are widely used in the aerospace field due to their high specific strength, specific stiffness, excellent corrosion resistance, fatigue characteristics and structural designability. Generally speaking, thermosetting resins change from the initial small molecular structure to bulky cross-linked structure, and generally shrink in volume. The release of by-products in the reaction causes solidification volume shrinkage; the second is the heat shrinkage caused by cooling the polymer generated at high temperature to room temperature. These two types of shrinkage will have a certain impact on th...

Claims

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Application Information

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IPC IPC(8): G01N25/16
Inventor 刘刚刘表曼安学锋益小苏
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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