Laser sintered powder with metallic soaps method of its manufacture and shaped element made of such laser sintered powder

A technology of sintering powder and laser sintering, which is applied in the field of polyamide, can solve the problems of rough surface of the molded body, and achieve the effects of low embrittlement, high fracture elongation, and reduced renewal rate

Inactive Publication Date: 2004-06-16
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Drawbacks of currently used polyamide-powders are sinks and rough surfaces on molded bodies when green powders are reused

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1: Addition of sodium montanate by reprecipitation

[0048] With 40 kg of unadjusted PA 12 prepared by hydrolytic polymerization (the preparation of this polyamide is described, for example, in DE 21 52 194, DE 25 45 267 or DE 35 10 690, its relative solution viscosity η 相对 = 1.61 (in acidified m-cresol); end group content [COOH] = 72 mmol / kg, [NH 2 ]=68 mmol / kg) with 0.3 kg of IRGANOX® 1098 and 0.8 kg of sodium montanate (Licomont® NAV 101) and 350 liters of ethanol (modified with 2-butanone and containing 1% water) in 5 hours at 0.8m 3 Heat to 145° C. in a stirred tank (D=90 cm, h=170 cm) and keep at this temperature for 1 hour with stirring (paddle stirrer, d=42 cm, speed=91 Upm). Subsequently, the temperature of the jacket was lowered to 120° C., and the internal temperature was lowered to 120° C. at a cooling rate of 45 K / h at the same rotational speed of the stirrer. From now on, keep the jacket temperature 2 to 3K lower than the internal temperature at ...

Embodiment 2

[0059] Example 2: Addition of Sodium Montanate by Mixing and Reprecipitation

[0060] With 40 kilograms of unadjusted PA 12 (its relative solution viscosity η) prepared by hydrolytic polymerization 相对 = 1.61, in acidified m-cresol; end group content [COOH] = 72 mmol / kg, [NH 2 ]=68 mmol / kg) with 0.3 kg of IRGANOX® 245 and 0.8 kg of sodium montanate (Licomont® NAV101) were extruded in a two-shaft mixer (Bersttorf ZE25) and granulated as strands. The mixture was then mixed with 350 liters of ethanol (modified with 2-butanone and containing 1% water) at 0.8 m 3 Heat to 145° C. in a stirred tank (D=90 cm, h=170 cm) and keep at this temperature for 1 hour with stirring (paddle stirrer, d=42 cm, speed=91 Upm). Subsequently, the temperature of the jacket was lowered to 120° C., and the internal temperature was lowered to 120° C. at a cooling rate of 45 K / h at the same rotational speed of the stirrer. From now on, keep the jacket temperature 2 to 3K lower than the internal temperatu...

Embodiment 3

[0071] Embodiment 3: adding sodium montanate in ethanol suspension

[0072] As described in Example 1, however instead of adding the metal soap initially, 0.4 g of sodium montanate (Licomont® NAV 101 ). Drying and other processing were as described in Example 1. Sieve analysis:

[0073] <32 microns: 6% by weight

[0074] <40 microns: 19% by weight

[0075] <50 microns: 44% by weight

[0076] <63 microns: 88% by weight

[0077] <80 microns: 94% by weight

[0078] <100 microns: 100% by weight

[0079] BET: 5.9m 2 / g

[0080] Bulk density: 453 g / L

[0081] Laser diffraction: d(10%): 47 microns, d(50%): 63 microns, d(90%): 99 microns.

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Abstract

A sinter powder containing a polyamide and metal soaps, in particular particles of a salt of an alkanemonocarboxylic acid. A process for laser sintering, and to moldings produced from the sinter powder. The moldings formed using the powder have advantages in appearance and in surface finish when recyclability in the selective laser sintering (SLS) process is taken into account. Moldings produced from recycled sinter powder have improved mechanical properties, in particular in the modulus of elasticity and tensile strain at break.

Description

technical field [0001] The invention relates to laser-sintered powders based on metal soap (particles)-containing polyamides, preferably polyamide 12, a process for producing the powders and shaped bodies produced by selective laser sintering of the powders. Background technique [0002] The issue that is often raised recently is to provide prototypes smoothly. A method particularly suitable for rapid prototyping purposes is selective laser-sintering. In this method, plastic powder in a chamber is selectively and briefly exposed to laser light, so that the powder particles irradiated by the laser light melt. The molten particles fuse with each other and rapidly solidify again into a solid. Using this method, three-dimensional shaped bodies of complex geometries can be produced simply and rapidly by repeated exposure of successively applied coatings. [0003] This laser-sintering method (rapid prototyping method) for producing shaped bodies from powdery polymers is describ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C67/04B29C67/00B29K77/00B29K105/16C08K3/40C08K5/098C08L77/00C08L77/02
CPCC08K5/098B29C67/0077C08L77/02C08L77/00B29K2077/00B29C64/153B33Y70/10
Inventor S·蒙希梅M·格雷贝F·-E·鲍曼恩J·梅格W·克里斯托赫
Owner EVONIK OPERATIONS GMBH
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