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Method for preparing sandwich material PET foam for wind power generation blade

A technology for wind power generation blades and core materials, which is applied in the field of PET foam and its preparation, and achieves the effects of lowering extrusion temperature, low price and good effect.

Inactive Publication Date: 2010-11-17
SHANGHAI YUEKE COMPOSITE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to data retrieval and market research, there are no relevant reports on PET foam, which is a sandwich material for wind power blades.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Put 20 grams of PET sheets into a high-pressure preheating container, and fill the high-pressure preheating container with supercritical CO 2 For the fluid, keep the temperature at 25°C, increase the pressure to 10Mpa, perform gas permeation treatment at constant pressure for 2 hours, release the pressure and take it out, and then perform foaming heat treatment on the PET sheet at 120°C for about 15s to make the bubbles nucleate and grow. get the product.

[0014] Product foam density: 120Kg / m 3 , the compressive strength is: 200Pa, and the shear strength is: 93Pa.

Embodiment 2

[0016] Put 20 grams of PET sheets into a high-pressure preheating container, and fill the high-pressure preheating container with supercritical CO 2 For the fluid, keep the temperature at 100°C, increase the pressure to 3MPa, keep the pressure constant for 10 hours, release the pressure and take it out, then foam and heat treat it at 170°C for about 30s.

[0017] The density of its foam: 200Kg / m 3 , its compressive strength is: 310Pa, shear strength is: 165Pa.

Embodiment 3

[0019] Put 20 grams of PET sheet into a high-pressure container, keep the temperature at 150°C, increase the pressure to 10MPa, keep the pressure constant for 20h, release the pressure and take it out, then foam and heat-treat it at 200°C for about 5s.

[0020] The density of its foam: 250Kg / m 3 , its compressive strength is: 520Pa, shear strength is: 210Pa.

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Abstract

The invention relates to a method for preparing sandwich material PET foam for a wind power generation blade. The preparation method comprises the following steps of: feeding PET sheets into supercritical fluid under a high-pressure preheating environment, keeping the PET sheets for certain time, and then thermally treating the PET sheets by a quick pressure reduction method so as to reduce the solubility of gas in the polymer and initiate bubble nucleation and increment. Compared with the prior art, when the PET foam is prepared by using a supercritical CO2 fluid method, the CO2 has the characteristics of lower critical temperature, realization of supercritical operation nearby room temperature, low critical pressure, no-toxicity, combustion resistance, high-purity industrial product and the like. By using the method, the PET foam is used for replacing PVC foam, and the Balsa wood has low price and good effect.

Description

technical field [0001] The invention relates to a PET foam and a preparation method thereof, in particular to a preparation method of a closed-cell PET foam which is a core material of a wind power generation blade. Background technique [0002] With the development of high technology, foamed PET materials (PET is polyethylene terephthalate, English name: polyethylene terephthalate) are becoming more and more important in the fields of composite sandwich structure materials and wind power generation blades. Therefore, it is more urgent to develop a kind of closed-cell PET foam material, which can be used to replace PVC foam and Balsa wood, replace imported materials with domestic materials, and solve the bottleneck of relying on imports of wind power blade sandwich materials. According to data retrieval and market research, there are no relevant reports on PET foam, which is a sandwich material for wind power blades. Contents of the invention [0003] The purpose of the p...

Claims

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Application Information

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IPC IPC(8): C08J9/00C08J9/28C08L67/02
Inventor 韩芹王建东周利峰张玲
Owner SHANGHAI YUEKE COMPOSITE
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