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PEEK powder with high processing property and preparation method and application thereof

A processing performance and powder technology, which is applied in the field of PEEK powder and its preparation, can solve the problems of unstable parts performance, inability to sinter, and low bulk density, and achieve the effects of improving processing stability, avoiding insufficient transportation, and high bulk density

Active Publication Date: 2019-08-23
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the powder materials provided by the existing polyether ether ketone (PEEK) powder manufacturers are prone to a series of problems such as surface agglomeration, particles, and roughness when powder spreading at high temperatures. Sintering will not work
At the same time, a large number of experimental studies have shown that the existing PEEK powder materials still have the following problems in HT-SLS processing: (1) The powder bulk density is low at low temperature, and the powder exists at a high preheating temperature. Due to the expansion situation, the sintered part after laser scanning is easily scraped away by the powder spreading roller, resulting in forming failure; (2) Due to the extremely irregular powder shape and poor fluidity, the powder spreading is uneven or even impossible to spread, and the powder spreading performance is good or bad It is random, and the performance of the parts is unstable; (3) the powder is very easy to agglomerate during pre-powdering, which makes the sintering unable to continue, and the agglomerated powder cannot be recycled, and the economic loss is relatively large
Therefore, there is an urgent need in this field to improve the performance of the existing PEEK powder, improve the processing performance of the PEEK powder, so as to be suitable for the application of high-temperature laser selective sintering, to solve the accumulation of existing PEEK powder in the application of high-temperature laser selective sintering Problems of low density, poor fluidity and easy caking

Method used

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  • PEEK powder with high processing property and preparation method and application thereof
  • PEEK powder with high processing property and preparation method and application thereof
  • PEEK powder with high processing property and preparation method and application thereof

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preparation example Construction

[0031] Such as figure 1 As shown, the preparation method of a PEEK powder with high processability provided by the embodiment of the present invention includes the following steps.

[0032] (1) wet sieving

[0033] Add the existing PEEK powder into the alcohol aqueous solution, and manually stir it in a suspended state to obtain a suspension, wherein, in the alcohol aqueous solution, the volume ratio of the alcohol solution to water is 2:8 to 9:1; preferably, alcohol and water The volume ratio is 1:1. Preferably, the alcohol solution is an ethanol solution.

[0034] The suspension is passed through a high-mesh sieve, and at the same time, it is necessary to continuously transport the alcohol aqueous solution to the high-mesh sieve to ensure that the small particle PEEK powder in the suspension can pass through the high-mesh sieve smoothly. When the filtrate passing through the high-mesh sieve no longer has small white particles of PEEK powder, stop the filtration operation....

Embodiment 1

[0049] Configure an alcohol aqueous solution with a volume ratio of 5:5, add the existing PEEK powder into the alcohol aqueous solution, and manually stir it in a suspended state; pass the suspension through a 600-mesh sieve, and at the same time, the alcohol aqueous solution is continuously transported to sieve out the small powder particles. Stop the operation when the filtrate does not appear white matter; collect the viscous matter on the sieve and filter it with suction, and the obtained solid block is initially crushed, put it in a vacuum oven for 48 hours at 150°C, and vacuum dry at a gauge pressure of 0.08Mpa to obtain the product Grind and pass through a 100-mesh sieve to obtain the first PEEK powder.

[0050] Put the first PEEK powder into the powder feeding tank of HT-SLS equipment; set the pre-spreading parameters: pre-spreading start temperature 260°C, pre-spreading holding temperature 260°C, powder-spreading time interval 30s, single-layer thickness of powder-spra...

Embodiment 2

[0058] Configure an alcohol aqueous solution with a volume ratio of 2:8, add the existing PEEK powder to the alcohol aqueous solution, and manually stir it to be in a suspended state; pass the suspension through a 400-mesh sieve, and at the same time, the alcohol aqueous solution is continuously transported to sieve out the small powder particles; The viscous matter on the sieve was collected and suction filtered, the obtained solid block was initially crushed, put into a vacuum oven for drying at 100°C for 60 hours, and vacuum-dried at a gauge pressure of 0.07Mpa. The obtained product was ground and passed through a 100-mesh sieve to obtain the first PEEK powder.

[0059] Put the first PEEK powder into the powder delivery tank of HT-SLS equipment; set the pre-spreading powder parameters: the pre-spreading start temperature is 170°C, the pre-spreading maintenance temperature is 170°C, the powder-spreading time interval is 20s, the single-layer thickness of the powder-spreading l...

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Abstract

The invention belongs to the field of advanced manufacturing technology and material preparation, and specifically discloses a PEEK powder with a high processing property and a preparation method andapplication thereof. The method comprises: S1, adding a PEEK powder into an alcohol aqueous solution, performing sieving with a high-mesh sieve, and refining a thick material; S2, performing infraredradiation heat treatment on the powder; S3, weighing a flow auxiliary agent, a de-electrostatic agent, a reinforcing and toughening filler and a second PEEK powder in appropriate proportions, and performing mixing; S4, sieving and grading the powder; and S5, performing static electricity removal and dehumidifying to obtain the PEEK powder with the high processing property. The invention also discloses a corresponding product and an application thereof. The processing performance of the PEEK powder can be improved, the characteristics that the PEEK powder has high bulk density, good fluidity and no easy agglomeration in the high-temperature laser selective sintering application are realized, the processing stability is also greatly improved, and the process is simple, low in cost, non-toxic, and easy to implement.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing technology and material preparation technology, and more specifically relates to a PEEK powder with high processing performance and its preparation method and application. Background technique [0002] High Temperature-Selective Laser Sintering (HT-SLS) is an important branch of powder bed additive manufacturing technology. The biggest difference between it and the usual Selective Laser Sintering (SLS) technology is that it can process High-performance special engineering plastics, such as polyaryletherketone (Polyaryletherketone, PAEKs), polyimide (Polyimide, PI), etc. For these high-performance specialty engineering plastics, they usually have a very high melting point, usually above 300°C. In order to avoid part warping during the forming process and ensure the accuracy of the part, the forming cavity needs to be preheated to a very high temperature (close to the melting point of the mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/16C08K9/04C08K3/36C08K3/22C08K7/20C08K7/18C08K3/26C08J3/28
CPCC08J3/28C08J2361/16C08K3/22C08K3/26C08K3/36C08K7/18C08K7/20C08K9/04C08K2003/2227C08K2003/265C08K2201/011C08L61/16
Inventor 闫春泽陈鹏李昭青伍宏志杨磊刘主峰文世峰刘洁史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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