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Powder containing core particles coated with polymer containing metals, metal oxides, metal nitrides or half metal nitrides

A core particle and polymer technology, which is used in polyamide coatings, metal processing equipment, dyeing polymer organic compounds, etc., can solve problems such as deviations in component performance that are difficult to control, achieve constant improvement in mechanical properties, and reduce static electricity. , the effect of improving recyclability

Pending Publication Date: 2017-10-20
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, if the handling of the powder is automated in a rapid manufacturing method, uncontrollable deviations in the properties of the produced parts arise

Method used

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  • Powder containing core particles coated with polymer containing metals, metal oxides, metal nitrides or half metal nitrides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Example 1: Reprecipitation of nylon 12 (PA 12) (not according to the invention)

[0097] 400 kg of disordered PA 12 prepared by hydrolytic polymerization and having a relative solution viscosity of 1.62 and a COOH end group content of 75 mmol / kg and a NH2 end group content of 69 mmol / kg were denatured with 2-butanone and a water content of 1%. 2500 l of ethanol together in 3 m 3 A stirred tank (a = 160 cm) was heated to 145° C. over a period of 5 hours and maintained at said temperature under stirring for 1 hour (paddle stirrer, x = 80 cm, speed = 49 rpm). The jacket temperature was then lowered to 124° C. and the internal temperature was brought to 125° C. with a cooling rate of 25 K / h at the same stirrer speed with continuous ethanol removal by distillation. From this point onwards, the jacket temperature was kept 2K-3K lower than the internal temperature with the same cooling rate. The internal temperature was brought to 117° C. with the same cooling rate and then ...

Embodiment 2

[0100] Example 2: Single stage reprecipitation of PA12 with core particles (according to the invention)

[0101] Corresponding to Example 1, the relative solution viscosity (η rel ) and COOH end group content of 75 mmol / kg and NH of 66 mmol / kg 2 The PA 12 with end group content was reprecipitated in the presence of core particles with the properties given in Table 1:

[0102] Table 1: Characterization data for various core particles used in Example 2:

[0103] particles

d 50

Al 2 o 3 (Martoxid® MN / Y 216)

> 10 µm

al 2 o 3 (Martoxid® DN 206)

5-7 µm

al 2 o 3 (Martoxid® MDLS-6)

3-4 µm

Al 2 o 3 (Martoxid® MZS-1)

1.5-1.9 µm

stainless steel sheet

31 µm

AS081 aluminum powder

28 µm。

[0104] In this example, the precipitation conditions were changed in the following way compared to Example 1:

[0105] Precipitation temperature: 108°C

[0106] Settling time: 150 min

[0107] Stirrer sp...

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Abstract

The invention refers to a powder containing core particles coated with polymer containing metals, metal oxides, metal nitrides or half metal nitrides, and specifically the invention refers to a powder used in a layer-by-layer processing method which selectively fuses areas of each powder layer through electromagnetic energy. Composite particles comprising core particles completely or partially coated with a precipitated polymer, where the d50 median diameter of the core particles is 1 [mu]m or greater and the ratio of the d50 median diameter of the composite particles to the d50 median diameter of the core particles is 1.15 or greater, are provided. A method to prepare the particles includes dissolution of a polymer in a solvent and reprecipitation of the polymer in the presence of a suspension of the core particles. Further provided is a layer by layer moulding process employing the composite particles and mouldings obtained therefrom.

Description

[0001] This application is a divisional application of the application number 201210231020.0, and the filing date of the application number 201210231020.0 is July 5, 2012. technical field [0002] The invention relates to powders based on fillers coated with polymers, which are advantageous in terms of process stability and density, the use of said powders in forming processes, and also to the use of said powders for the production of powder layers by layer-by-layer processing methods. Shaped bodies prepared by regioselective melting. After cooling and solidification of the previously layer-by-layer molten regions, the shaped body can be removed from the powder bed. The profiled parts according to the invention also exhibit a lower tendency to deform than conventional profiled parts. Background technique [0003] The most frequently encountered task recently is the rapid provision of prototypes. Particularly suitable methods are those in which the processing is based on pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/628C04B35/634C04B35/10B28B1/00B22F1/02B22F3/105B33Y70/00B33Y10/00B33Y80/00B22F1/102
CPCB33Y10/00B33Y80/00B28B1/001C04B35/10C04B35/62802C04B35/62886C04B35/634C04B35/63468B22F10/00B22F1/102B22F10/28B33Y70/10B29C67/04C04B35/6264C04B35/628C04B35/62897C04B2235/3217C04B2235/3852C04B2235/5409C04B2235/5436C04B2235/6026C04B2235/665C09C3/10C09D177/02C01P2002/88C01P2004/62C01P2004/84C01P2006/12B29C64/153Y10T428/2998Y10T428/25Y02P10/25
Inventor W.迪克曼F-E.鲍曼M.格雷贝K.瓦恩克S.蒙沙伊默
Owner EVONIK OPERATIONS GMBH
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