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Nylon polymer powder material and preparation method thereof

A technology of mixing powder materials and powder materials, which is applied in the field of additive manufacturing, can solve the problems of inability to form heat medium heat absorption and conduction and heat preservation temperature field, poor absorption effect of nylon powder, and slow heat conduction speed, so as to improve the performance of parts and prevent Effects of carbon black agglomeration and fluidity improvement

Active Publication Date: 2019-03-26
HUNAN FARSOON HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art still has the problem of poor absorption effect of nylon powder. The conventional nylon powder material and heat medium are mixed together by stirring. The heat medium only exists on the outer surface of the nylon powder material, while the inner surface of the nylon powder material does not There is no heat medium, so the heat transfer can only be transferred from the outer surface of the nylon powder material to the inner surface, the heat conduction speed is slow, the heat absorption effect is not good, and it is impossible to form a heat absorption conduction and heat preservation temperature field that contains heat medium on both the inner and outer surfaces

Method used

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  • Nylon polymer powder material and preparation method thereof
  • Nylon polymer powder material and preparation method thereof
  • Nylon polymer powder material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] (1) Add 100 parts of nylon 1212 pellets, 1 part of carbon black with a particle size of 1 μm, and 600 parts of methanol into the polymerization kettle. The entire solvent precipitation method is divided into four stages. The first stage is the temperature increase and pressure increase stage. The stirring rate is 600r / min, the temperature is lowered to 100°C, and the pressure is reduced to 1.0Mpa; in the third stage, the heat preservation and pressure are maintained for 100min, the stirring rate is controlled at 50r / min, the heat preservation is to 100°C, and the pressure is maintained to 1.0MPa; the fourth stage, The temperature was rapidly lowered to normal temperature and pressure, and the stirring rate was 800r / min to finally obtain the nylon powder grown with the heat medium as the nucleating agent, and the particle size of the obtained nylon powder was 60 μm.

[0045] (2) Add 20 parts of nylon 1212 powder and 1 part of carbon black with a particle size of 60nm int...

Embodiment 2

[0049] (1) Add 100 parts of nylon 1010 pellets, 0.1 part of graphene with a particle size of 0.1 μm, and 700 parts of ethanol in the polymerization kettle. The entire solvent precipitation method is divided into four stages. The first stage is the temperature increase and pressure increase stage. The stirring rate is 520r / min, the temperature is lowered to 110°C, and the pressure is reduced to 1.1Mpa; in the third stage, the heat preservation and pressure are maintained for 40 minutes, the stirring rate is controlled at 70r / min, the heat preservation is 110°C, and the pressure is maintained to 1.1MPa; the fourth stage, The temperature is rapidly lowered to normal temperature and pressure, and the stirring rate is 640r / min to finally obtain a nylon powder that grows with the heat medium as a nucleating agent, and the particle size of the obtained nylon powder is 40 μm.

[0050] (2) Add 20 parts of nylon 1010 powder and 1.5 parts of carbon black with a particle size of 70nm into...

Embodiment 3

[0054] (1) Add 100 parts of nylon 6 pellets, 10 parts of ferric oxide powder with a particle size of 10 μm, and 1000 parts of dimethylformamide into the polymerization kettle. The entire solvent precipitation method is divided into four stages. The first stage is the temperature increase and pressure increase stage. The stirring rate is 570r / min, the temperature is lowered to 120°C, and the pressure is reduced to 1.2Mpa; in the third stage, the heat preservation and pressure are maintained for 70 minutes, the stirring rate is controlled to 70r / min, the heat preservation is 120°C, and the pressure is maintained to 1.2MPa; the fourth stage, The temperature is rapidly lowered to normal temperature and pressure, and the stirring rate is 700r / min to finally obtain the nylon 6 powder grown with the heat medium as the nucleating agent, and the particle size of the obtained nylon 6 powder is 50 μm.

[0055] (2) Add 20 parts of nylon 6 powder and 1 part of carbon black with a particle ...

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Abstract

The invention provides a preparation method of a nylon polymer powder material. The preparation method comprises the following steps: adding the following components into a polymerizing pot in percentage by mass: 85-99.9% of nylon aggregate and 0.1-15% of a thermal medium material, adding a solvent, and preparing a nylon powder material taking the thermal medium as a nucleating agent by adopting asolvent precipitation method; adding 20 parts of nylon powder material and 0.1-1.5 parts of carbon black into a mixing tank, and performing the first high-speed mixing so as to prepare a nylon and carbon black mixed powder material; adding the nylon and carbon black mixed powder material, 0.1-1 part of a flow promoter and 80 parts of the nylon powder material into the mixed powder barrel, performing the second high-speed mixing and screening, thereby obtaining the nylon polymer powder material. By adopting the nylon powder taking the thermal medium material as the nucleating agent and the high-speed mixing, the carbon black is uniformly attached onto the nylon powder surface, so that the nylon powder in the prior art is applied to fiber laser sintering, the surface quality of the parts isexcellent, the structure is fine, and the overall performance is excellent.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a nylon polymer powder material and a preparation method thereof. Background technique [0002] The selective sintering of multiple powder layers by laser sintering is a method of manufacturing three-dimensional objects that allows three-dimensional entity. This method is primarily accomplished using thermoplastic polymers. Patents US6136948 and WO9606881 describe this method of manufacturing three-dimensional objects using powdered polymers in detail. [0003] The existing mainstream selective laser sintering mainly uses CO2 lasers with a wavelength of 10600nm, which corresponds to the mid-infrared region. Nylon powder materials have a higher wavelength absorption rate in this range, but when nylon powder materials are used in fiber laser sintering, the The wavelength has an extremely low absorption rate, making it difficult to apply existing nylon ...

Claims

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Application Information

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IPC IPC(8): C08L77/06C08L77/02C08K9/10C08K3/04C08K3/22C08K3/08B29C64/153B33Y70/00
CPCB29C64/153B33Y70/00C08K3/04C08K3/042C08K3/08C08K3/22C08K9/10C08K2003/085C08K2003/2272C08K2201/003C08L77/02C08L2205/02C08L2205/24C08L77/06
Inventor 许小曙文杰斌鲍光曾思齐尹志勇赖端
Owner HUNAN FARSOON HIGH TECH CO LTD
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