A kind of distillation cooling device and cooling method of nylon powder for sls

A technology for cooling and cooling nylon powder, which is used in manufacturing, solid material additive processing, and additive processing. Controllable size, reduced adverse effects, high bulk density effect

Active Publication Date: 2018-08-21
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a distillation cooling device and cooling method for preparing nylon powder for laser selective sintering (SLS) by solvent precipitation method, the purpose of which is to adopt the cooling device and cooling method of distillation cooling method, realize the cooling speed of the control system by controlling the evaporating gas flow rate, and take away the crystallization enthalpy during nylon precipitation in time, thus solving the problem that the cooling device and cooling method in the prior art cannot take away the crystallization enthalpy during nylon precipitation in time, and the system The technical problems of wide particle size distribution, poor sphericity and low bulk density of the prepared nylon powder caused by poor temperature uniformity

Method used

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  • A kind of distillation cooling device and cooling method of nylon powder for sls
  • A kind of distillation cooling device and cooling method of nylon powder for sls
  • A kind of distillation cooling device and cooling method of nylon powder for sls

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Embodiment 2

[0074] The distillation cooling and cooling device is the same as in Example 1.

[0075] A solvent precipitation method to prepare nylon powder for SLS. First, nylon 11, ethanol and other additives are placed in the kettle body 1 according to a certain ratio, and the temperature is raised to 150°C at a certain heating rate, and then cooled according to the following distillation Cooling method for cooling operation:

[0076] (1) After nylon 11 is kept at 150°C for 2.5 hours, before the cooling process starts, the mass flow rate of the gas is set to 6.3L / min through the MFC, so that the cooling rate is controlled at 40°C / h;

[0077] (2) open control valve 4, start distillation cooling process;

[0078] (3) When the temperature drops close to the nylon 11 crystallization temperature of 110°C, set the MFC to 12.6L / min, increase the gas mass flow rate, speed up the distillation rate, and control the cooling rate at 80°C / h, and observe the temperature change at all times , so tha...

Embodiment 3

[0082] The distillation cooling and cooling device is the same as in Example 1.

[0083] A solvent precipitation method to prepare nylon powder for SLS. First, nylon 6, ethanol and other additives are placed in the kettle body 1 according to a certain ratio, and the temperature is raised to 180°C at a certain heating rate, and then cooled according to the following distillation Cooling method for cooling operation:

[0084] (1) After nylon 6 is kept at 180°C for 3 hours, before the cooling process starts, the mass flow rate of the gas is set to 3.2L / min through the MFC, and the cooling rate is controlled at 20°C / h;

[0085] (2) open control valve 4, start distillation cooling process;

[0086] (3) When the temperature drops close to the nylon 6 crystallization temperature of 120°C, set the MFC to 9.5L / min, increase the gas mass flow rate, speed up the distillation speed, control the cooling rate at 60°C / h, and observe the temperature change at all times. Allow the temperatur...

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Abstract

The invention discloses a distillation cooling device and method for preparing nylon powder for SLS through a solvent deposition method. The distillation cooling device comprises an autoclave body, a stirring device, an online temperature monitoring device, a control valve, an MFC, a condenser and a receiving device. According to the distillation cooling method, through the arrangement of the MFC, the evaporation gas flow control manner is adopted for controlling the cooling temperature of the system, crystallized enthalpy generated during nylon deposition can be brought away in time, the temperature rise range in the autoclave body is reduced, the system temperature uniformity is guaranteed, and the sphere-like nylon powder controllable in particle size, regular in shape and appearance and good in fluidity can be prepared.

Description

technical field [0001] The invention belongs to the field of advanced manufacturing technology and material preparation, and more specifically relates to a distillation cooling device and a cooling method for preparing nylon powder for selective laser sintering (SLS) by a solvent precipitation method. Background technique [0002] Selective Laser Sintering (SLS) is one of the most widely used 3D printing technologies at present. It uses solid powder as raw material and adopts the principle of layered manufacturing superposition to directly manufacture three-dimensional solid parts from CAD models. At present, crystalline polymer nylon (polyamide, PA) can directly manufacture plastic functional parts through SLS. Nylon and its composite material parts have the characteristics of excellent formability, high product strength precision, and good toughness. The most widely used type of material in SLS, accounting for more than 95% of the current SLS material market. [0003] Sol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C64/153B29C64/20B33Y30/00
CPCB33Y30/00
Inventor 闫春泽陈鹏史玉升朱伟唐明晨魏青松刘洁
Owner HUAZHONG UNIV OF SCI & TECH
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