Negative pressure foaming method for preparing epoxy resin foam with air as blowing agent

A technology of epoxy resin and foaming agent, applied in the field of negative pressure foaming, to avoid environmental pollution problems and health threats, simple formula and good versatility.

Active Publication Date: 2020-01-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the environmental, health and economical problems caused by the addition of foaming agents in the existing epoxy resin foam preparation process, and to provide a negative pressure foaming method for preparing epoxy resin foam with air as the foaming agent. method, this method does not need to add a foaming agent, just by controlling the process parameters of the stirring process, a large number of uniformly distributed microbubbles are introduced into the resin-curing agent mixture, combined with subsequent temperature rise and pressure drop operations to expand the bubbles and adjust the foaming effect And make the epoxy resin foam curing molding

Method used

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  • Negative pressure foaming method for preparing epoxy resin foam with air as blowing agent
  • Negative pressure foaming method for preparing epoxy resin foam with air as blowing agent
  • Negative pressure foaming method for preparing epoxy resin foam with air as blowing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 100g of E44 type bisphenol A type epoxy resin and preheat to 35°C. Weigh 20g of curing agent T31 and 20g of curing agent NX2040 at a mass ratio of 100:40, and pour them into the preheated epoxy resin together. Put the prepared initial material in the mixer, and ensure that the length of the mixer blade is slightly smaller than the diameter of the cup mouth (there is a space of about 0.5cm on both sides). Adjust the stirring environment temperature of the mixer to 40±3°C, set the stirring speed at 1200±120rpm, and control the stirring time at 15±1.5min. After setting the stirring parameters, start high-speed stirring. After stirring, measure the initial material with a rotary viscometer The viscosity value is 5020mPa·s. Take out the mixed material that has been stirred, pour it into an open mold preheated to 60°C, and then put the mold into a vacuum oven with a constant temperature of 60°C. Open the air valve of the oven, connect the vacuum pump for vacuuming, an...

Embodiment 2

[0020] Other steps and conditions of this embodiment are the same as those of Example 1, except that the foaming mold preheating temperature and foaming temperature are both set to 80° C., and the foaming air pressure is set to 0.04 MPa to prepare a foam material with a low foaming rate. After testing, the density of the epoxy resin foam material prepared in this embodiment is 0.38g / cm 3 (Foam rate 2.30). SEM results such as figure 2 shown, from figure 2 It can be seen in (50 times magnification) that the epoxy resin foam material has uniform and closed cells.

Embodiment 3

[0022] The other steps and conditions of this embodiment are the same as those of Embodiment 1, except that the preheating temperature of the foaming mold and the foaming temperature are both set to 120° C., and the foaming pressure is set to 0.01 MPa to destroy the internal pores and form through holes. After testing, the density of the epoxy resin foam material prepared in this embodiment is 0.151g / cm 3 (Foam rate 6.28). SEM results such as image 3 Shown (50x magnification), from image 3 It can be seen that the epoxy resin foam material has uniform cells and a through-hole structure.

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Abstract

The invention relates to a negative pressure foaming method for preparing epoxy resin foam by using air as a foaming agent, which solves the problems of environment, health and economy in the preparation process of epoxy resin foam. In this method, without adding foaming agent and other foaming aids, only epoxy resin and curing agent are used as raw materials, and the air is uniformly mixed in the form of bubbles and dispersed into the mixed material through high-speed stirring. Epoxy resin foam material with uniform cell size and controllable foaming quality was prepared by vacuum foaming process. The foaming rate and cell structure can be controlled by changing the stirring speed, stirring temperature during the stirring process, or the foaming temperature and foaming air pressure during vacuum foaming. This method has the advantages of environmental protection, simple operation, cost-effectiveness and high efficiency.

Description

technical field [0001] The invention relates to the technical field of epoxy resin foam materials, in particular to a negative pressure foaming method for preparing epoxy resin foam by using air as a foaming agent. Background technique [0002] Epoxy resin foam material is a kind of epoxy resin-air composite material. A large number of uniform and dense microbubbles inside and the performance of epoxy resin itself endow epoxy resin foam with heat insulation, sound insulation, fire prevention, heat preservation, shock absorption and cushioning. Shock absorption, electrical insulation and other properties, so it is widely used in basic fields such as thermal insulation of household appliances, fire and heat insulation in public places, sound insulation of tunnel buildings, packaging of fragile objects and precision instruments, and is also widely used in military industry, aerospace and aerospace fields There are also important applications. [0003] The current foaming metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/30C08L63/00
CPCC08J9/30C08J2363/00C08J2463/00
Inventor 李维曹洁官建国龙昌
Owner WUHAN UNIV OF TECH
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