Method for forming thermoplastic polyester elastomer closed pore micro-foaming product

Abstract

The invention discloses a method for forming a thermoplastic polyester elastomer closed pore micro-foaming product, which comprises the following steps of: filling a thermoplastic polyester elastomer into a forming die with capillary through holes, putting the forming die into a high-pressure container, injecting a gas into the high-pressure container to displace air in the high-pressure container, adjusting the temperature of the high-pressure container to between 160 and 220 DEG C and adjusting the pressure to between 8 and 30MPa, keeping the high-pressure container for 10 to 50 minutes at a constant temperature under a constant pressure, then reducing the pressure of the high-pressure container to the atmospheric pressure at the speed of 200 to 700MPa / s, taking the forming die out, and cooling and removing the forming die to obtain the thermoplastic polyester elastomer closed pore micro-foaming product, wherein the gas is nitrogen or carbon dioxide. The method has simple process, is convenient to operate and control, and can obtain the micro-foaming polyester elastomer product with smaller foam pore size, higher foam pore density, more uniform foam pore structure and more excellent damping impact resistance.

Description

technical field [0001] The invention relates to the field of material science, in particular to a molding method of a thermoplastic polyester elastomer closed-cell micro-foaming product. Background technique [0002] Foamed plastics are a class of polymer materials formed by dispersing a large amount of gas in solid plastic in the form of bubbles. In the early 1980s, scholars J.E Martini, J Colton, and N P Suh of the Massachusetts Institute of Technology in the United States used CO 2 , N 2 Inert gas is used as blowing agent to develop a foam plastic with a cell diameter of micron, and the cell diameter is 1 μm to 50 μm, and the cell density is 10 9 ~10 12 Hole (cells) / cm 3 Foam plastics are defined as microcellular foam plastics, commonly known as microcellular foamed plastics (Collias D I, Baird D G. Polymer engineering and science.1995, 35: 1167-1177; Falconer J W, Nazarov W, Baker M J, Sutton D W. Journal of cellular plastics.1997March 1,1997,33(2):127-139; Matuana ...

AI Technical Summary

Problems solved by technology

Because the microcapsule foaming agent used for foaming mainly depends on imports, the price is quite expensive, and at the same time, the microcapsule foaming agent is easy to disperse unevenly. When preparing microfoamed TPEE, there are problems of uneven cell distribution and difficult control of cell size. Problem; this kind of cell structure problem will also affect the mechanical properties of the material. In addition, there is a problem of compatibility between the microcapsules and the foam matrix. Whether the compatibilizer is added or not will affect the mechanical properties of the material, and cause material recycling. difficult question

Regardless of the chemical foaming method or the microcapsule foaming method, the prepared micro-foamed TPEE products have uneven cell distribution and large cell size, making it difficult to use as structural materials.

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