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Preparation method of nylon powder for selective laser sintering

A laser sintering and nylon powder technology is applied in the field of nylon powder preparation for selective laser sintering, which can solve the problems of excessive solvent residues in nylon salts, changing the color of nylon salts, and affecting the performance of sintered parts, so as to improve drying efficiency and drying quality. Improved, fast heating effect

Active Publication Date: 2016-05-11
HUNAN FARSOON HIGH TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In the prior art, the drying method is used to reduce the humidity of the nylon salt, but drying the nylon salt through an ordinary or vacuum drying oven can only dry the surface of the nylon salt, and the drying efficiency is low, and the drying process is easy to cause the nylon salt to turn yellow and agglomerate, which will cause Change the color of nylon salt, which in turn affects the performance of sintered parts. In addition, there are many solvent residues in nylon salt processed by ordinary or vacuum drying, which is difficult to recycle and cause waste.

Method used

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  • Preparation method of nylon powder for selective laser sintering

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[0021] A method for preparing nylon powder for selective laser sintering, characterized in that it comprises the following steps:

[0022] 1) Put a sufficient amount of dibasic acid, diamine and ethanol into a reaction vessel, and react to obtain a nylon salt solution, and centrifugally filter to obtain a copolymerized nylon salt. The dibasic acid is adipic acid, sebacic acid, One or more of undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, the diamines are hexamethylenediamine, decanediamine, undecanediamine , one or more of dodecanediamine, tridecanediamine, tetradecanediamine;

[0023] 2) Place the obtained nylon salt in a microwave drying apparatus and dry it for 10-30 minutes at a temperature of 30-40°C to obtain a dried nylon salt after drying. The humidity of the dried nylon salt is 0.1-5.0%;

[0024] 3) Add dry nylon salt, molecular weight regulator, and deionized water into the closed polymerization reactor, and obtain copolymerized ...

Embodiment 1

[0028] Add 6.9Kg of dodecanedioic acid, 5.16Kg of dodecanediamine and 9.6Kg of ethanol into the reactor, generate a copolymerized nylon salt solution at 75°C, and centrifugally filter to obtain nylon 1212 salt;

[0029] The nylon salt prepared above was placed in a microwave drying apparatus and dried at 40°C for 10 minutes to obtain the dried nylon salt. The humidity of the dried nylon salt was 0.1%;

[0030] Add the copolymerized nylon salt, molecular weight regulator and deionized water into the polymerization kettle. Airtight, vacuumize, and then pass through the carbon dioxide protection gas 0.15MPa. Raise the temperature to 200°C, the pressure reaches 1.2MPa, keep the pressure for 3 hours, then slowly release the air to normal pressure, raise the temperature to 245°C and keep the reaction for 3 hours, stop heating, water-cool the strands to discharge, pelletize, and obtain copolymerized nylon 1212 pellets. Then add the prepared copolymerized nylon 1212 pellets into the...

Embodiment 2

[0032] Add 6.9Kg of dodecanedioic acid, 5.16Kg of dodecanediamine and 9.6Kg of ethanol into the reactor, generate a copolymerized nylon salt solution at 75°C, and centrifugally filter to obtain nylon 1212 salt;

[0033] The nylon salt prepared above was placed in a microwave drying apparatus and dried at 35°C for 25 minutes to obtain the dried nylon salt. The humidity of the dried nylon salt was 5%;

[0034] Add the copolymerized nylon salt, molecular weight regulator and deionized water into the polymerization kettle. Airtight, vacuumize, and then pass through the carbon dioxide protection gas 0.12MPa. Raise the temperature to 220°C, the pressure reaches 1.5MPa, keep the pressure for 2 hours, then slowly release the air to normal pressure, raise the temperature to 260°C and keep the reaction for 2 hours, stop heating, water-cool the strands to discharge, pelletize, and obtain copolymerized nylon 1212 pellets. Then add the prepared copolymerized nylon 1212 pellets into the p...

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Abstract

The invention discloses a preparation method of nylon powder for selective laser sintering. The stability of a melting point of the nylon powder material prepared through the method is high, and the quality and performance of a selective laser sintering product are greatly improved. The method mainly includes the following steps that 1, sufficient binary acid, diamine and ethyl alcohol are placed in a reaction vessel, a nylon salt solution is prepared through a reaction, and copolymerized nylon salt is obtained after centrifugal filtration; 2, the obtained nylon salt is placed in a microwave drying instrument to be dried for 10-30 min at the temperature of 30-40 DEG C, and the treated dry nylon salt is obtained; 3, the dry nylon salt, a molecular weight modifier and deionized water are added to an airtight polyreactor, and copolymerized nylon particles are obtained through a copolymerization reaction; 4, the prepared copolymerized nylon particles are prepared into copolymerized nylon powder through a solvent precipitation method; 5, the copolymerized nylon powder, a flow promoter and an antioxygen are mixed, and the nylon powder for selective laser sintering is obtained.

Description

technical field [0001] The invention provides a method for preparing nylon powder, in particular to a method for preparing nylon powder for selective laser sintering. Background technique [0002] Selective Laser Sintering technology (Selective Laser Sintering) is a widely used rapid prototyping technology at present. The principle of the forming process is: firstly establish a computer 3D model of the target part, and then use layered software to slice the 3D model to obtain each The data information at the processing level is under the control of the computer, and according to the information at the slice level, the laser beam is used to scan and sinter the heat-fusible powder material layer by layer, and finally complete the processing and manufacturing of the target parts. Selective laser sintering technology can be applied to a very wide range of materials, including polymers, metals and ceramics. [0003] In the selective laser sintering process, the powder material i...

Claims

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Application Information

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IPC IPC(8): C08L77/06C08G69/26C08G69/30
CPCC08G69/26C08G69/30C08L77/06
Inventor 罗秋帆文杰斌
Owner HUNAN FARSOON HIGH TECH CO LTD
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