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Polyamide foams, process to make them and applications thereof

A foam material, polyamide technology, applied in the field of polyamide foam materials, can solve the problems of thermal and chemical resistance limitations of foam materials

Active Publication Date: 2008-01-16
ZOTEFOAMS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, foams made from said materials are limited in thermal and chemical resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Polyamide 6 was prepared by extrusion blending 75% of extrusion grade polyamide 6 (Frianyl B83 H, Frisetta Polymers GmbH) with 25% of a crosslinkable polyamide 6 compound (Frianyl B63 VN, Frisetta Polymers GmbH). blocks. The block was irradiated by an electron beam at 4.5 MeV to a dose of 36 kGy. The block was then placed in a pressure vessel introduced with nitrogen to a pressure of 670 bar. The temperature was raised to 250°C and the pressure was maintained until the block was saturated with nitrogen. The pressure is then reduced and the pressure vessel is cooled. Once cooled, the residual pressure was released to atmospheric pressure. The partially expanded block was placed in a second vessel and reheated to 240°C under a nitrogen pressure of 17 bar. Then release the pressure to obtain a 30kg / m 3 dense microcellular foam.

Embodiment 2

[0055] Crosslinkable masterbatches were obtained by compounding triallyl isocyanurate (TAIC DLC-A, Natrochem Inc.) in the form of an anhydrous liquid concentrate into polyamide / polyolefin alloy Orgalloy LE60LM (Arkema Ltd) to prepare. Blocks of Orgalloy were then prepared by extrusion blending this masterbatch with more Orgalloy LE60 LM to achieve a TAIC concentration of 0.8%. The block was irradiated by an electron beam at 4.5 MeV to a dose of 36 kGy. The block was saturated with nitrogen, then expanded as described in Example 1. The resulting foam has a 28 kg / m 3 dense microporous structure.

Embodiment 3

[0057] Blocks of polyamide 11 were prepared by extrusion blending 80% of polyamide 11 (Rilsan BESNO P40 TL, Arkema Ltd) with 20% of a crosslinkable polyamide 6 compound (Frianyl B63 VN, Frisetta Polymers GmbH) . The block was irradiated by an electron beam at 4.5 MeV to a dose of 36 kGy. The block was saturated with nitrogen, then expanded as described in Example 1. The resulting foam has a 35 kg / m 3 dense microporous structure.

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Abstract

Closed cell polyamide foams are prepared by subjecting a polyamide resin to inert gases at an elevated pressure and at a temperature above the softening point of the resin and reducing the pressure while the temperature is maintained above the softening point of the resin, resulting in expansion of the resin.

Description

technical field [0001] The present invention relates to polyamide foams, their production methods and applications. Background technique [0002] High-quality foam materials are manufactured by infiltrating polyamide resins or alloys with an inert gas under high pressure, and then reducing the pressure to expand the material. The material is preferably crosslinked to infiltrate and swell well above the normal melting point. The foam obtained can be fabricated into any desired shape, such as tubes, sheets, strips, blocks and rods, using techniques such as cutting, welding, thermoforming and bonding. Alternatively, the polyamide resin or alloy may be expanded directly into the desired shape, for example, by expanding the infiltrated polyamide resin or alloy in a mold. They are useful in applications requiring low density, high temperature properties. They have the additional benefits of high purity, good chemical resistance and good heat resistance. They also exhibit good ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12B29C44/08B29C44/34C08J9/00
CPCC08J2201/03C08J2201/032B29C44/3453B29C44/348C08J2205/052C08J2423/00C08J9/0061C08J2377/02B29C44/08C08J9/122
Inventor 保罗·雅各布斯尼尔·维滕
Owner ZOTEFOAMS