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Nylon powder with narrow particle size distribution and its preparation and application 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 that nylon powder is difficult to have high bulk density and high BET surface area, reduce the bulk density of nylon powder, and reduce the mechanical properties of parts. , to achieve the effect of good absorption of laser energy, low average particle size, and growth of elongation at break

Active Publication Date: 2022-07-12
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 its preparation and application in 3D printing
  • Nylon powder with narrow particle size distribution and its preparation and application in 3D printing
  • Nylon powder with narrow particle size distribution and its preparation and application in 3D printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1 (step 2) was performed once)

[0052] 1) In a 1m 3 In the stirring vessel (blade stirrer, d=50cm), after feeding 25Kg of PA12 resin particles and 100Kg of industrial ethanol, set the stirring speed to 75rpm. After heating to 145°C and stirring for 1 hour, after the nylon PA12 resin was completely dissolved, the internal temperature was reduced to 111°C (precipitation temperature) at a rate of 30°C / h, and stirred at this temperature for 30 minutes, and precipitated out at this temperature, and detected that the heat has been released.

[0053] 2) The obtained suspension is heated up to 125°C (redissolving temperature) at a speed of 15°C / h, and stirred at this temperature for 30 min; then cool down to 111°C (precipitation temperature) at a cooling rate of 15°C / h, and at this temperature The temperature was stirred for 30 min, at which temperature the evolution of heat was detected indicating the formation of precipitation.

[0054] 3) After the cooling rate i...

Embodiment 2

[0057] 1) In a 1m 3 In the stirring vessel (blade stirrer, d=50cm), set the stirring speed to 75rpm; heat 25Kg of PA12 resin particles with 100Kg of industrial ethanol to 145°C and stir for 1h, the resin is completely dissolved. The internal temperature was lowered to 111°C (precipitation temperature) at a rate of 45°C / h, and stirred at the temperature for 30 min, at which temperature precipitation was precipitated, and the release of heat was detected.

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

[0059] Subsequently, the suspension was heated to 125°C (redissolving temperature) at a rate of 15°C / h, and stirred at this temperature for 30 min; Stirring at temperature for 30 min (ie step 2) was carried out twice).

[0060] 3) After the suspension is c...

Embodiment 7

[0080] According to the method of Example 6, only the following changes were made:

[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 present invention provides a nylon powder with narrow particle size distribution and its preparation and application in 3D printing. The nylon powder with narrower particle size distribution, lower average particle size and relatively high bulk density can be prepared. The preparation method of the nylon powder with the narrow particle size distribution includes the following steps: 1) dissolving the nylon resin in an alcohol solvent, and cooling the obtained solution to 110-115°C at a cooling rate of 30-50°C / h; Stir at this temperature, precipitation is separated out; 2) gained crystallization system is warmed up to 125-130 ℃, and stirs 5-30min at this temperature; Then cool down to 110-115 ℃ again, and stir 5-30min at this temperature; This step 2) is performed more than once; 3) then the crystallization system is cooled to below 75°C at a cooling rate of 30-50°C / h, centrifuged and dried to obtain the nylon powder.

Description

technical field [0001] The invention relates to a nylon powder with narrow particle size distribution, a preparation method thereof, and the application of the nylon powder in 3D printing. Background technique [0002] Selective laser sintering (3D printing) technology is one of the most widely used rapid prototyping technologies in the field of additive manufacturing. It is based on digital model files and uses solid powders such as thermoplastics as raw materials to build layer-by-layer printing. object. Compared with traditional subtractive and equal-material manufacturing and processing technologies, this method does not require molds and original embryos, greatly shortens the production cycle of products, and can effectively improve efficiency and reduce costs, so it is 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 polylactic acid, ABS...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/14C08L77/02C08L77/06B33Y70/10
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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