Polymer composition for selective sintering

A technology of polymers and compositions, applied in the direction of 3D object support structure, processing and manufacturing, manufacturing tools, etc., can solve the problems of not having high melting point, not having continuous use temperature, etc.

Active Publication Date: 2019-04-02
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyesters disclosed in this publication are prepared by polycondensation of dihydric or polyhydric aliphatic alcohols and aliphatic dicarboxylic acids, do not have the desired high melting point, and thus do not have the desired continuous use temperature > 100°C

Method used

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  • Polymer composition for selective sintering
  • Polymer composition for selective sintering
  • Polymer composition for selective sintering

Examples

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Embodiment 1

[0153] Example 1 represents an embodiment of the invention, and Examples 2-4 are included for comparative purposes.

[0154] Subject the above materials to use including CO 2 Selective laser sintering method of Mini-SLS machine with laser source. During each laser sintering process, 4 square plates of 30x30x2 mm are produced. 0.05% by weight of Aerosil 200 flow promoter was added to each powder. The material was pre-dried and then processed via SLS. The SLS method is carried out in an atmosphere with an oxygen content of ≦1.0% by weight. The SLS method conditions are shown in Table 2. The moisture content of the atmosphere is <50ppm.

[0155] Table 2: SLS Processing Conditions

[0156] Example

1

2(C)

3(C)

4(C)

Powder bed temperature (℃)

225

173

140

213

Piston temperature (℃)

185

135

65

170

Cylinder temperature (℃)

145

110

65

180

Feed temperature (°C)

160

120

70

160

Las...

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Abstract

The present invention relates to a polymer composition for production of shaped objects via selective laser sintering wherein the polymer composition comprises a thermoplastic material having: a crystallisation half time of >= 30 s and <= 12 min at a supercooling of 50 DEG C below the peak melt temperature, wherein the crystallisation half time t1 / 2,c as determined via differential scanning calorimetry in accordance with ISO 11357-1 (2009); a glass transition temperature Tg of >= 50 DEG C as determined in accordance with ISO 11357-2 (2013); a peak melt temperature Tp,m of >= 200 DEG C as determined in accordance with ISO 11357-3 (2011), first heating run; an extrapolated first heating run melt onset temperature Tei,m of >= 5 DEG C above the extrapolated first cooling run crystallisation end temperature Tef,c as determined in accordance with ISO 11357-1 (2009), first heating and cooling run; and a degree of crystallinity of >= 10.0 % as determined according to the formula (I), wherein:D = degree of crystallinity of the thermoplastic material (%); deltaHf = enthalpy of fusion of the thermoplastic material as determined in accordance with ISO 11357-3 (2011); deltaHf,100 = enthalpy offusion of the thermoplastic material in a 100% crystalline state. Such polymer composition has a continuous use temperature of >= 100 DEG C, and a low change of molecular weight during exposure to selective laser sintering processing temperatures.

Description

technical field [0001] The present invention relates to polymer compositions for selective sintering. The invention also relates to a method for producing shaped objects via selective sintering using the polymer composition according to the invention. The invention furthermore relates to shaped objects produced via selective sintering using the polymer composition according to the invention. Background technique [0002] Selective sintering is an emerging technology that allows the production of complex three-dimensional objects. Currently, one of the main manufacturing techniques for such three-dimensional objects is via injection moulding. However, injection molding involves the use of expensive molds, so injection molding is an efficient manufacturing technique when the quantity of objects produced using the molds is large enough. For the production of smaller series of objects, the production costs are prohibitive. Therefore, alternative manufacturing techniques are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183B29C67/00C08J9/24
CPCB33Y70/00B33Y10/00B29C64/153C08G63/183B33Y80/00B29C64/35B29K2067/003B29K2509/02B29K2509/10C08G2250/00
Inventor Z·巴什尔顾昊
Owner SABIC GLOBAL TECH BV
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