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Polymer powder with adapted melt behaviour

A technology of polymers and powders, which is applied in processing and manufacturing, solid material additive processing, additive processing, etc., and can solve problems such as insufficient toughness

Inactive Publication Date: 2013-10-30
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The powders on the basis of AABB-polyamides, which are obtainable according to DE102004020453, are capable of producing molded parts with high heat resistance, but the toughness of such molded parts is not yet strong enough

Method used

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  • Polymer powder with adapted melt behaviour
  • Polymer powder with adapted melt behaviour

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Experimental program
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Effect test

Embodiment 1

[0062] The following measurement methods are used within the scope of the present invention:

[0063]

[0064]

[0065] Melting and recrystallization temperatures are determined using a Perkin Elmer Diamand or DSC7 instrument as measuring instrument (DDLK-principle). 6-8 mg of sample was added to an unpierced crucible with a lid. Nitrogen at a flow rate of 20 ml / min was used as the flushing gas. The samples were heated from -30°C to 270°C and the grain melting points were determined. The enthalpy is determined by analysis of linear connecting lines according to the aforementioned standard DIN 53765.

[0066] Synthesis Example 1 (PA1010):

[0067] The following ingredients are fed to the 200 liter mixing tank for the manufacture of PA1010:

[0068] 34.957 kg 1,10-decanediamine (as 98.5% aqueous solution)

[0069] 40.902 kg sebacic acid and

[0070] 8.6 grams of 50% hypophosphorous acid (hypophosphorousacid) aqueous solution (equivalent to 0.006% by weight) and

[...

A Embodiment 2

[0131] A Example 2: Reprecipitation of PA1010 (not according to the invention)

[0132] Reprecipitate 40 kg of PA1010-sample obtained in Synthesis Example 1 according to Example 1; the precipitation conditions are set as follows:

[0133] Dissolving temperature: 155°C, seed formation temperature / time: 128°C / 60 minutes

[0134] Precipitation temperature: 120°C, precipitation time: 1 hour, agitator speed: 90Upm

[0135] Grain melting point T m : 192°C and 206°C

[0136] Melting enthalpy: 128J / g

[0137] Relative solution viscosity η ref : 1.69

[0138] Bulk density: 380g / l

[0139] BET: 6.80m 2 / g

[0140] D(10%)=44μm, D(50%)=69μm, D(90%)=103μm

Embodiment 3

[0141] Example 3: Reprecipitation of PA1012 (not according to the invention)

[0142] The 40 kg PA1012-pellet sample obtained in Synthesis Example 2 was reprecipitated according to Example 1, wherein the precipitation conditions were changed as follows compared with Example 1:

[0143] Dissolving temperature: 155°C, seed formation temperature: 141°C

[0144] Precipitation temperature: 123°C, precipitation time: 40 minutes, agitator speed: 110Upm

[0145] Grain melting point T m : 191°C and 202°C

[0146] Melting enthalpy: 148J / g

[0147] Relative solution viscosity η ref : 1.69

[0148] Bulk density: 430g / l

[0149] BET: 3.90m 2 / g

[0150] D(10%)=34μm, D(50%)=65μm, D(90%)=94μm

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Abstract

The present invention provides precipitated polymer powders based on a polyamide of the AABB type, obtained by the reprecipitation of the polyamides by at least partial dissolution followed by continuous cooling of the solution to below the precipitation temperature. The polyamides are prepared by polycondensation of diamines with dicarboxylic acids. The precipitated polyamides obtained are used in layer-by-layer shaping processes such as selective laser sintering.

Description

technical field [0001] The invention relates to a precipitation polymer powder on the basis of polyamides of the AABB-type produced by polycondensation of diamines with dicarboxylic acids, a process for the production of said powder, a process for the layer-by-layer production of three-dimensional objects , the use of said powder in a molding method for the layer-by-layer production of three-dimensional objects and three-dimensional objects (molded bodies) produced with said powder by a method which works layer by layer, by which method optionally The area where the powder layer is fused. Background technique [0002] Rapid prototyping is a frequently faced task these days. Methods which operate on the basis of pulverulent materials and which produce the desired structure layer by layer by selective melting and solidification are particularly suitable. Here, support structures can be dispensed with in the protrusions and undercuts, since the powder bed surrounding the fusi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/06C08G69/28C08J5/00B29C67/00
CPCC08J2377/06C08J3/124C08L77/06C08G69/26C08J3/14B29C67/0077C08G69/28B29C64/153B33Y70/00
Inventor W·迪克曼F-E·鲍曼M·格雷贝
Owner EVONIK DEGUSSA GMBH
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