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Nylon powder as well as preparation method and application thereof

A nylon powder, nylon technology, applied in the direction of additive processing, etc., can solve the problem that the cost and performance of nylon powder cannot well meet the requirements of selective laser sintering technology, it is difficult to meet the performance requirements of laser sintering, and the fluctuation of particle size distribution width is relatively high. Large and other problems, to achieve the effect of maintaining compactness, loose control accuracy requirements, and reducing production costs

Pending Publication Date: 2022-04-05
POLYROCKS TECH&RES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the nylon powder prepared by the commonly used solvent precipitation method can easily meet the particle size requirements of the SLS technology, the particle size (D50) of the prepared powder is less than 60 μm, and the apparent density is not lower than 420g / L. The particle size distribution width (D90-D10) basically exceeds 50 μm, which is difficult to meet the performance requirements of laser sintering. At the same time, this preparation method requires very high temperature control accuracy, and temperature fluctuations easily cause large fluctuations in the particle size distribution width. Sieving treatment, resulting in lower yield
Therefore, the nylon powder prepared by the existing solvent precipitation technology still cannot meet the requirements of selective laser sintering technology in terms of cost and performance.

Method used

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  • Nylon powder as well as preparation method and application thereof
  • Nylon powder as well as preparation method and application thereof
  • Nylon powder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Add 600g of nylon 1012 resin, 3750ml of ethanol, 200g of water, and 1.8g of antioxidant 1098 into the autoclave, replace it with high-purity nitrogen for 20 minutes, pressurize to 1MPa, then heat up to 145°C while stirring and keep the temperature for 90 minutes to make the material dissolve. Then, two-stage cooling is carried out through coil heat exchange. The cooling rate of the first stage is 3°C / min to 130°C, and the temperature is kept constant for 10 minutes; the cooling rate of the second stage is 1°C / min to 120°C, and the temperature is kept constant for 10 minutes. Afterwards, the coil heat exchange temperature was kept at 120°C, and at the same time, the temperature of the suspension was raised to 123°C through the autoclave jacket at a rate of 0.2°C / min. At this time, the temperature of the autoclave was raised to 130°C by adjusting the cooling rate of the coil heat exchange. Adjust the coil heat exchange to lower the temperature of the suspension to 120°C a...

Embodiment 2

[0055] Add 600g of nylon 12 resin, 3750ml of ethanol, 200g of water, and 1.8g of antioxidant 1098 into the autoclave, replace it with high-purity nitrogen for 20 minutes, pressurize to 1MPa, then heat up to 145°C while stirring and keep the temperature for 90 minutes to make the material dissolve. Then, two-stage cooling is carried out through coil heat exchange. The cooling rate of the first stage is 3°C / min to 131°C, and the temperature is kept constant for 10 minutes; the cooling rate of the second stage is 1°C / min to 119°C, and the temperature is kept constant for 10 minutes. Afterwards, keep the coil heat exchange temperature at 120°C, and at the same time raise the temperature of the suspension to 123°C through the autoclave jacket at a rate of 0.2°C / min. Adjust the coil heat exchange to lower the temperature of the suspension to 119°C at a cooling rate of 0.4°C / min, and keep the temperature constant for 5 minutes. Then adjust the coil heat exchange to reduce the temper...

Embodiment 3

[0058] Add 600g of nylon 1012 resin, 3750ml of ethanol, 200g of water, and 1.8g of antioxidant 1098 into the autoclave, replace it with high-purity nitrogen for 20 minutes, pressurize to 1MPa, then heat up to 145°C while stirring and keep the temperature for 90 minutes to make the material dissolve. Then, two-stage cooling is carried out through coil heat exchange. The cooling rate of the first stage is 3°C / min to 129°C, and the temperature is kept constant for 10 minutes; the cooling rate of the second stage is 1°C / min to 119°C, and the temperature is kept constant for 10 minutes. Afterwards, keep the coil heat exchange temperature at 120°C, and at the same time raise the temperature of the suspension to 123°C through the autoclave jacket at a rate of 0.2°C / min. Adjust the coil heat exchange to reduce the temperature of the suspension to 119°C at a cooling rate of 0.4°C / min, and keep the temperature constant for 5 minutes. Then adjust the coil heat exchange to reduce the tem...

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Abstract

The invention discloses nylon powder and a preparation method and application thereof, and the preparation method of the nylon powder comprises the following steps: reducing the temperature of a nylon hot solution to T1, and carrying out first nucleation-growth to form a first suspension; raising the temperature of the first suspension to T2, then reducing the temperature to T3, and carrying out second nucleation-growth to obtain a second suspension; wherein T2-T1 is smaller than or equal to 15 DEG C, and T2-T3 is smaller than or equal to 15 DEG C; continuously cooling the second suspension to form a precipitate; and carrying out post-treatment on the precipitate to obtain the nylon powder. The nylon powder prepared by the method is narrow in particle size distribution, large in apparent density and high in yield, and can well meet the use of the SLS technology.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a nylon powder and its preparation method and application. Background technique [0002] Selective laser sintering technology, namely SLS (Selective Laser Sintering) technology, is a typical 3D printing technology. This technology uses the idea of ​​layered manufacturing and uses the principle of discrete-stacking to stack materials layer by layer to manufacture physical objects. Emerging manufacturing technology embodies The close combination of information network technology, advanced material technology and digital manufacturing technology is an important part of intelligent manufacturing. After years of rapid development, SLS technology has been widely used in various fields such as automobiles, household appliances, aerospace, medical biology, etc. It is one of the more mature 3D printing technologies at present. [0003] At present, most of the selective laser si...

Claims

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Application Information

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IPC IPC(8): C08J3/16C08L77/06C08L77/02B33Y70/10
CPCY02P10/25
Inventor 雷伟健王强朱红芳梁亚涛兰天齐陈钢杨正高
Owner POLYROCKS TECH&RES CO LTD