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Nylon powder with narrow particle size distribution and preparation thereof, and application of nylon powder in 3D printing

A nylon powder and narrow-grain technology, which is applied in the application field of the nylon powder in 3D printing, can solve the problems of reduced mechanical properties of parts, increased voids, and insufficient powder density, etc., to achieve good mechanical properties and narrow particle size distribution , the effect of low average particle size

Active Publication Date: 2020-03-17
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high BET surface area will inevitably reduce the bulk density of nylon powder, so that the powder on the powder bed is not dense enough during the printing process, and the gap between the melts increases when the powder particles absorb laser energy and melts, and the layers are There may even be defects due to the difference in shrinkage between layers, resulting in a reduction in the mechanical properties of the part or even an orange peel phenomenon
Based on currently known existing technologies, it is difficult for nylon powder to achieve high bulk density and high BET surface area at the same time

Method used

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  • Nylon powder with narrow particle size distribution and preparation thereof, and application of nylon powder in 3D printing
  • Nylon powder with narrow particle size distribution and preparation thereof, and application of nylon powder in 3D printing
  • Nylon powder with narrow particle size distribution and preparation thereof, and application of nylon powder in 3D printing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1 (step 2) carried out 1 time)

[0052] 1) In a 1m 3 In the stirring container (blade stirrer, d=50cm), after the PA12 resin particles of 25Kg and the industrial ethanol of 100Kg are fed, the stirring speed is set to 75rpm. After heating to 145°C and stirring for 1 hour to completely dissolve the nylon PA12 resin, the internal temperature drops to 111°C (precipitation temperature) at a rate of 30°C / h, and stirs at this temperature for 30 minutes, and precipitates at this temperature. And detect that heat has been given off.

[0053] 2) The resulting suspension was heated to 125°C (redissolution temperature) at a rate of 15°C / h, and stirred at this temperature for 30 minutes; then cooled to 111°C (precipitation temperature) at a cooling rate of 15°C / h, and Stirring was carried out for 30 min at the temperature at which an exotherm was detected indicating precipitation.

[0054] 3) After cooling down to 75°C at a rate of 50°C / h, the suspension was transferred t...

Embodiment 2

[0057] 1) In a 1m 3 In a stirring container (blade stirrer, d=50cm), set the stirring speed at 75rpm; heat 25Kg of PA12 resin particles and 100Kg of industrial ethanol to 145°C and stir for 1 hour, and the resin is completely dissolved. The internal temperature was reduced to 111°C (precipitation temperature) at a rate of 45°C / h, and stirred at the temperature for 30 minutes. Precipitation occurred at this temperature, and it was detected that heat had been released.

[0058] 2) The resulting suspension was heated to 125°C (redissolution temperature) at a rate of 15°C / h, and stirred at this temperature for 30 minutes; then cooled to 111°C (precipitation temperature) at a cooling rate of 15°C / h, and Stir at this temperature for 30min;

[0059] Then the suspension was heated to 125°C (redissolution temperature) at a speed of 15°C / h, and stirred at this temperature for 30min; then cooled to 111°C (precipitation temperature) at a cooling rate of 15°C / h, and Stirring at high temp...

Embodiment 7

[0080] According to the method of embodiment 6, only make following change:

[0081] The resin particles used were changed from nylon 12 resin to nylon 612.

[0082] The particle size distribution and bulk density test results are shown in Table 1.

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Abstract

The invention provides nylon powder with narrow particle size distribution and preparation thereof, and application of nylon powder in 3D printing. The prepared nylon powder is narrower in particle size distribution, lower in average particle size and relatively high in bulk density. The preparation method of the nylon powder with narrow particle size distribution comprises the following steps of:1) dissolving nylon resin in an alcohol solvent, cooling the obtained solution to 110-115 DEG C at a cooling rate of 30-50 DEG C / h, performing stirring at the temperature, and performing precipitating; 2) heating the obtained crystallization system to 125-130 DEG C, and performing stirring for 5-30 minutes at the temperature, then performing cooling to 110-115 DEG C, and performing stirring for 5-30min at the temperature of 110-115 DEG C; and 3) cooling the crystallization system to below 75 DEG C at a cooling rate of 30-50 DEG C / h, and carrying out centrifugal separation, and drying to obtain the nylon powder, wherein the step 2) is carried out once or more.

Description

technical field [0001] The invention relates to a nylon powder with a narrow particle size distribution, a preparation method thereof, and an application of the nylon powder in 3D printing. Background technique [0002] Selective laser sintering (3D printing) technology is currently one of the most widely used rapid prototyping technologies in the field of additive manufacturing. It is based on digital model files, using solid powder such as thermoplastics as raw materials, and is constructed by layer-by-layer printing. object. Compared with traditional subtractive and equal-material manufacturing and processing technologies, this method does not require molds and raw blanks, greatly shortens the production cycle of products, can effectively improve efficiency and reduce costs, and is therefore widely used in aerospace, automobile manufacturing and other fields. [0003] At present, the commonly used polymer materials in 3D printing technology on the market usually include ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/14C08L77/02C08L77/06B33Y70/00
CPCC08J3/14B33Y70/00C08J2377/02C08J2377/06Y02P10/25
Inventor 高斌刘彪陈海波杨伟翔苑先佩曲振潘现路吴士超
Owner WANHUA CHEM GRP CO LTD
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