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Thermoformable polymer sheets based on pseudo-amorphous polyaryletherketones

A kind of polyaryl ether ketone, polymer technology

Pending Publication Date: 2022-06-14
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the procedure described in U.S. Patent No. 4,996,287 for making such PAEK sheets has significant limitations

Method used

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  • Thermoformable polymer sheets based on pseudo-amorphous polyaryletherketones
  • Thermoformable polymer sheets based on pseudo-amorphous polyaryletherketones
  • Thermoformable polymer sheets based on pseudo-amorphous polyaryletherketones

Examples

Experimental program
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Embodiment 1

[0098] Using a single screw extruder and two cooling roller systems, measured by a T:I ratio with a 70:30 and a rheometer via a parallel plate in 100s -1 PeKK copolymers with a viscosity of 850 Pa·s at 360 °C produce 3 mm thick pseudo-amorphous sheets. The extrusion temperature is set at 375°C and the linear velocity is 0.5m / min; Cooling is provided only by cooling rollers and ambient air.

[0099] Sheets are thermoformed using a shuttle thermoforming machine equipped with a vacuum-molded negative mold. The sheet is placed in a heated oven and removed when the surface temperature of the sheet reaches 210 °C. The sheet is then quickly placed on the mold and the mold is heated to 250 °C with a torch heater. After vacuum molding, allow the part to be in contact with the mold for 4 minutes before demolding so that crystallization can occur. The resulting object is opaque and crystalline in the area where it contacts the mold, and is transparent in the area where it does not come into ...

Embodiment 2

[0106]In this embodiment, a computational study was conducted to measure the crystallinity of the extruded PEKK sheet with a T: I ratio between 68:32 and 74:26 and a thickness between 1mm and 10mm using a finite element model. The model specifies the density, thermal conductivity and heat capacity of each PEKK grade, the extruder temperature of 380°C, and the extrusion rate of 10cm / min, using 65W / m 2 The heat transfer coefficient of / K is used for convective cooling of ambient air at 25 °C (assuming some air circulation), and sheet thicknesses between 1 mm and 10 mm. The model uses the crystallization rate of the isothermal and non-isothermal crystallization equations based on Choupin, "Mechanical performances of PEKK thermoplasticcomposites linked to their processing parameters" (2017), where the parameters are adjusted to match the half-time crystallization of each grade of measurement. Table 1 lists the estimated maximum thickness of PEKK sheet extruded by grade (T:I ratio) to ...

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Abstract

Sheets having a thickness of 1000 to 10,000 microns useful in the production of thermoformed semi-crystalline articles are based on a polyaryletherketone having a viscosity at 360 DEG C of at least about 400 Pas at 100 s-1 as measured by a parallel plate rheometer. The polyaryletherketone is in a pseudo-amorphous state in the thermoformable sheet.

Description

Technical field [0001] The present invention relates to polymer sheets suitable for use in thermoforming applications, wherein the polymer sheet is based on a pseudo-amorphous polyaryletherketone (PAEK) polymer having certain melt viscosity properties. Background [0002] High-temperature thermoplastic polymers, such as polyaryl etherketones (PAEK), are constantly being evaluated as the choice for a variety of applications, including those in the aerospace and integrated circuit industries. In general, PAEK has excellent properties, including high temperature and chemical resistance, very good mechanical properties, excellent wear resistance and natural flame retardancy. PAEK parts can be produced by a variety of methods, including thermoforming. However, PAEK parts formed by conventional thermoforming methods may not exhibit the desired resistance to deformation and other properties at elevated temperatures. [0003] The thermoforming method is a conventional manufacturing metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L71/10C08J5/18
CPCC08J5/18C08J2371/10C08G65/4012B29B13/023B29C51/10B29C51/002B29C51/08C08J2471/12
Inventor R.雷伯三世J.莱昂斯J.朱诺B.克莱
Owner ARKEMA FRANCE SA