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Crosslinkable polyamide molding compounds and molded parts produced therewith

A polyamide molding, polyamide technology, used in optical components, disks, diagnostics, etc., can solve problems such as inability to perform thermoplastic processing

Inactive Publication Date: 2009-04-22
EMS CHEM AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Molded parts are often made from solutions of aramids in suitable solvents; therefore these finished products cannot be thermoplastically processed

Method used

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  • Crosslinkable polyamide molding compounds and molded parts produced therewith
  • Crosslinkable polyamide molding compounds and molded parts produced therewith
  • Crosslinkable polyamide molding compounds and molded parts produced therewith

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0079] GRILAMID TR 90 was machined on a tool known per se for injection molding LED optics, using a DEMAG Ergotech 35-120 injection molding machine with 25 mm screws. The tool is an electronically heated square mold with cold grooves and point gates. The barrel temperature is between 240°C and 280°C. Available in 2 material variants:

[0080] A) GRILAMID TR 90 natur with 3wt.% TAIC (beaten liquid);

[0081] B) GRILAMID TR 90 natur tape 12 wt.% masterbatch consisting of 75% GRILAMID TR 90 natur and 25% TAIC.

[0082] GRILAMID TR 90 (PA MACM12) with beaten liquid TAIC (modification A) exhibited a moist-stickty consistency immediately after addition of additives, but could easily shrink and process. In variant B, TAIC is added in the form of a masterbatch, and the dosing and processing behavior is also not a problem.

[0083] Measure the 3D imaging accuracy of the LED lens relative to the molding post. It was found that both GRILAMID TR 90 and these variants have very good v...

Embodiment 3、4、5 and 6

[0093] The transparent polyamide MACM12 (Grilamid TR 90) and PA MACMI / 12 (molar ratio: 81:19) were rolled into the TAIC composition listed in Table 5 with an ENGEL ES 330 / 80 injection molding tool at a barrel temperature of 240 °C to 300°C range to produce cups. These cups are 90mm high, have an upper diameter of 70mm, a lower diameter of 55mm and a wall thickness of 1.5mm. These cups were spray dry welded in aluminum containers and in this form subjected to electron irradiation, as described in Example 1. The total dose was 99kGy.

[0094] Table 5: Compositions and results of Examples 3 to 6

[0095]

[0096]

[0097] After irradiation, fatigue temperature tests were carried out using a test structure consisting of a holder for the cup, a central lamp holder with a halogen lamp (H11), a temperature sensor and a transformer. The bottom of the cup is removed each time so that the transparent cup can be inserted into the lamp holder through the halogen lamp. Then fix t...

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Abstract

The invention relates to crosslinkable, thermoplastic polyamide molding compounds, the polyamides being selected among a group comprising amorphous or microcrystalline polyamides, copolyamides thereof and the blends thereof, and blends of such polyamides with semicrystalline polyamides. One inventive polyamide molding compound is characterized in that the same contains a crosslinking additive which causes the production of crosslinked molded parts formed from said polyamide molding compound under the effect of high-energy irradiation, said molded parts having a glass transition temperature of>140 DEG C and a minimum dimensional stability of 90 percent at temperatures of > 180 DEG C. The polyamides have a substantially linear structure while the monomers thereof contain no olefinic C=C double bonds. Also disclosed are corresponding crosslinked molded polyamide parts produced from a polyamide molding compound as well as the use of the polyamide molding compound for producing the crosslinked molded polyamide parts.

Description

technical field [0001] The present invention relates to a crosslinked thermoplastic polyamide molding compound according to the preamble of independent claim 1, wherein the polyamide is selected from the group consisting of amorphous or microcrystalline polyamides, copolyamides thereof and blends thereof And groups of blends of these polyamides with semi-crystalline polyamides. The invention also relates to a corresponding crosslinked polyamide molding according to the preamble of independent claim 13 . Background of the invention [0002] German patent application DE 102 24 947 A1 discloses polyamide molding compounds for the production of polyamide moldings with good transparency, high chemical resistance and high dynamic load-bearing capacity. The polyamide moldings produced with these polyamide molding compounds have a melting point of 233-239° C. Due to such melting points, these polyamide moldings are not suitable for use at temperatures above 250°C. [0003] Cross-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/26A61B19/02C08L77/00A47G19/02G02B1/04
CPCC08G69/32C08L77/02C08L77/00C08G69/14C08L77/06C08G69/08C08L2205/02C08G69/26C08L2666/20
Inventor K·-J·史蒂夫纳
Owner EMS CHEM AG
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