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Method for preparing polyamide foam and foam capable of being produced by said method

A technology of polyamide and foam, which is applied in the field of preparing polyamide foam, and can solve the problems of irregular cell size and difficult control

Active Publication Date: 2012-04-18
POLYAMIDE HIGH PERFORMANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is sometimes difficult to control and the resulting cells may be irregular in size

Method used

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  • Method for preparing polyamide foam and foam capable of being produced by said method
  • Method for preparing polyamide foam and foam capable of being produced by said method
  • Method for preparing polyamide foam and foam capable of being produced by said method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Example 1 : Preparation of expandable particles

[0084] The compounds used are as follows:

[0085] - PA1: polyamide 6,6 with a VI of 138 ml / g and containing 1500 ppm water. End group content: AEG=42meq / kg, CEG=79meq / kg.

[0086] - PA2: polyamide 6,6 with a VI of 163 ml / g and containing 900 ppm water. End group content: AEG=35meq / kg, CEG=67meq / kg.

[0087] - PU1: aliphatic thermoplastic polyurethane based on ε-caprolactone, sold under the name Krystalgran PN03-214 by Huntsman.

[0088] - PU2: aliphatic thermoplastic polyurethane based on polyester, sold under the name Krystalgran PN3429-218 by Huntsman.

[0089] The composition was prepared by melt mixing using a co-rotating twin-screw extruder of the Thermo Prism type (model TSE16TC, length / diameter ratio 25). The prepared compositions and extrusion conditions are detailed in Table 1. Compound ratios are expressed in weight percent of the composition.

[0090] The extruded composition was cooled in water to a...

Embodiment 2

[0094] Example 2 : The use of extrusion equipment to prepare expanded materials

[0095] The expansion of the expandable particles of Example 1 was carried out in the melt phase using a co-rotating twin-screw extruder of the Thermo Prism type, type TSE16TC, with a length / diameter ratio of 25.

[0096] Extrusion conditions and resulting densities are summarized in Table 2.

[0097] Table 2

[0098]

[0099] In both cases, the pore distribution is closed.

Embodiment 3

[0100] Example 3 : Utilize injection molding equipment to prepare expanded products

[0101] The expansion of the expandable particles of Example 1 was carried out in the melt phase using a BOY 12M 129-18 injection molding machine from Bewe Plast with a plate mold of dimensions (mm) 80×10×4. The injection molding conditions and resulting densities are summarized in Table 3.

[0102] table 3

[0103]

[0104] In both cases, the pore distribution is closed. The core / skin structure was observed to have a cell size gradient from about 50 μm below the skin to about 1 mm in the core (see attached figure 1 , which corresponds to composition 1), a typical structural foam.

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Abstract

The present invention relates to a method for preparing polyamide foam and to polyamide foam capable of being produced according to said method. Said method includes heating a composition including at least one polyamide and at least one polyurethane, and stabilising the resulting cellular structure. The invention also relates to the use of a composition including at least one polyamide and at least one polyurethane for preparing polyamide foam.

Description

technical field [0001] The invention relates to a method for producing polyamide foams and polyamide foams which can be produced by this method. Background technique [0002] Synthetic foams are used in many fields, such as thermal or acoustic insulation, automotive trim, and many others. [0003] There are mainly two types of foams: structural foams and non-structural foams. [0004] Structural foams are rigid foams composed of a low-density core and skins with a density similar to that of the polymers that make up the matrix. These foams are useful, for example, as lighter structures in the aerospace or automotive sectors. [0005] Nonstructural foams can be flexible or rigid. Rigid foams are used in the field of thermal insulation (the gas is present in the cells as an insulator). Flexible foams are used in furniture and automotive upholstery because of their compressibility and cushioning properties, in packaging because of their low weight, and in sound insulation (...

Claims

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Application Information

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IPC IPC(8): C08J9/00C08J9/02C08G18/28C08G18/60
CPCC08J9/02C08J9/0061C08J2377/00C08J2477/00C08J2475/00C08J2375/04C08G2101/00C08J2475/04C08J9/00C08L77/00C08L75/04C08G18/28
Inventor L·特鲁耶-丰蒂E·罗什S·若尔
Owner POLYAMIDE HIGH PERFORMANCE
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