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polymeric material

A technology of polymer materials and blends, applied in the direction of solid material additive processing, additive processing, processing and manufacturing, etc., can solve the problems of expensive polymer materials and poor mechanical properties.

Active Publication Date: 2018-09-11
VICTREX MFG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polymeric materials like PAEK are expensive and at least for economical reasons there is a need to be able to recycle the unsintered polymeric material and reuse it in the manufacture of another article by laser sintering
However, it was found that laser sintered objects made from a combination of virgin and recycled polymeric materials may disadvantageously have inferior mechanical properties compared to objects made from 100% virgin polymer

Method used

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  • polymeric material
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Examples

Experimental program
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Effect test

example 1

[0114] Example 1 - Preparation of polyether ether ketone (PEEK)-polyether diphenyl ether ketone (PEDEK) copolymer

[0115] A 300 liter vessel fitted with lid, stirrer / stirrer guide, nitrogen inlet and outlet was charged with diphenylsulfone (125.52 kg) and heated to 150°C. After fully melting, 4,4'-difluorobenzophenone (44.82kg, 205.4mol), 1,4-dihydroxybenzene (16.518kg, 150mol) and 4,4'-dihydroxybiphenyl (9.311 kg, 50mol) into the container. The contents were subsequently heated to 160°C. While maintaining the nitrogen blanket, dry sodium carbonate (21.368 kg, 201.6 mol) and potassium carbonate (1.106 kg, 8 mol), both sieved through a sieve with 500 micron mesh openings, were added. Sodium Carbonate D 50 It is 98.7 μm. The temperature was increased at 1°C / min to 180°C and held for 100 minutes. The temperature was raised to 200°C at 1°C / min and held for 20 minutes. The temperature was increased at 1 °C / min to 305 °C and held until the desired melt viscosity was reached...

example 2

[0116] Example 2 - General Method for Determining Melt Viscosity (MV) of Polymers

[0117] Unless otherwise stated, this use is at 340°C for 1000s -1 Capillary rheometry operating at a shear rate of 0.5 mm x 3.175 mm using a tungsten carbide mold. MV measurements were taken 5 minutes after the polymer had fully melted, which was considered 5 minutes after the polymer was loaded onto the cylinder of the rheometer.

example 3-

[0118] Differential Scanning Calorimetry of Example 3-PEEK-PEDEK Copolymer

[0119] The degree of crystallinity referred to herein can be assessed by several methods, for example by density, by ir spectroscopy, by X-ray diffraction or by differential scanning calorimetry (DSC). The DSC method has been used to assess the crystallinity of the polymers described herein using a Mettler Toledo DSC1 star system with FRS5 sensor.

[0120] The glass transition temperature (Tg), melting temperature (Tm), and heat of fusion (ΔHm) of the polymers described herein can be determined using the following DSC method.

[0121] An 8 mg sample of polymer was heated at 20°C / min from 30°C to 400°C, held for 5 minutes, then cooled at 20°C / min to 30°C and held at this temperature for 5 minutes. From the DSC traces, the onset Tg was obtained as the intersection of a line drawn along the pre-transition baseline and a line drawn along the maximum slope obtained during the transition. Tm is the temp...

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Abstract

A method of making an article by laser sintering comprising: (i) selecting a powder comprising a polymeric material having repeating units of the formula -O-Ph-O-Ph-CO-Ph-I and A repeating unit of the formula -O-Ph-Ph-O-Ph-CO-Ph-II wherein Ph represents a phenylene moiety; and (ii) selectively sintering the powder to produce the article. It was found that the polymers used can advantageously be recycled and blended with virgin materials to produce blends with very similar mechanical properties and crystallinity compared to said virgin materials. Therefore, the polymer can be used cost-effectively in laser sintering.

Description

technical field [0001] The present invention relates to polymeric materials and in particular, although not exclusively, to methods of making articles from polymeric powders by sintering using electromagnetic radiation. Background technique [0002] The method of rapid manufacturing of prototype parts starting from structural data is called rapid prototyping method. Usually the component to be produced is constructed layer by layer from amorphous or shape-neutral materials. In the case of starting materials in powder form, such methods are known, for example, under the names 3D-laser sintering, 3D-laser melting or 3D printing. Here, metals, ceramics and plastics are used as basic materials. For example, US Patent No. 5,730,925 describes a laser sintering method in which layers of powder are applied to a vertically movable support and in which the layers are selectively sintered by means of a laser at positions corresponding to the cross-section of the object to be manufact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C64/153C08G65/40B33Y10/00B33Y70/00
CPCC08G65/4012C08G2650/40B33Y10/00C08L71/00B29C64/153B29C64/35B29C64/357B29C64/188B33Y70/10C08G65/40C08J9/232B33Y30/00
Inventor 亚当·卓别林艾伦·伍德艾丽丝-维多利亚-玛丽·马修斯
Owner VICTREX MFG LTD
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