Preparation method of nylon powder for selective laser sintering

A nylon powder and laser sintering technology is applied in the field of nylon powder preparation, which can solve the problems of reducing the oxidation resistance of nylon powder, reducing the recovery rate of organic solvents, cumbersome production operations, etc., and achieves easy implementation, regular powder morphology, and repeatability. strong effect

Active Publication Date: 2015-04-08
HUNAN FARSOON HIGH TECH CO LTD
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Problems solved by technology

But in the actual production process, different nylon materials need to add different organic solvents to change their polarity to prepare nylon powder with regular shape, which reduces the recovery rate of organic solvents, and the production operation is cumbersome, and the production cost is relatively high. High, in addition, adding methyl ethyl ketone to the solvent will reduce the oxidation resistance of nylon powder, the powder will turn yellow, and the performance of the part will be deteriorated, so the nylon powder prepared by the existing technology is still not suitable for SLS sintering

Method used

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  • Preparation method of nylon powder for selective laser sintering

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] a. In 100Kg of methanol, add 10Kg of nylon 1212 pellets, under the pressure of 2.0MPa, stir at 170°C for 1.0h, and then lower the temperature. The cooling method adopts three stages of cooling, and the rate of the first stage is 0.8°C / min Cool down to 110°C; in the second stage, slowly cool down to 100°C at 0.05°C / min; in the third stage, quickly cool down to room temperature at 1.0°C / min. Centrifugal filtration, drying to obtain nylon 1212 powder, the powder shape is regular;

[0016] b. Mix the nylon 1212 powder obtained in step 1 with a flow aid and an antioxidant at a ratio of 1:0.003:0.003, and sieve after mixing evenly to obtain a selective laser sintering 1212 powder.

Embodiment 2

[0018] a. In 100Kg of ethanol, add 10Kg of nylon 1212 pellets, under the pressure of 2.0MPa, stir at 170°C for 1.0h, and then cool down. The cooling method adopts three stages of cooling, and the rate of the first stage is 2.0°C / min Cool down to 110°C; in the second stage, slowly cool down to 100°C at 0.2°C / min; in the third stage, quickly cool down to room temperature at 2.0°C / min. Centrifugal filtration, drying to obtain nylon 1212 powder, the powder shape is regular;

[0019] b. Mix the nylon nylon 1212 powder obtained in step 1 with flow aid and antioxidant at a ratio of 1:0.003:0.003, mix evenly and sieve to obtain a nylon 1212 powder for selective laser sintering.

Embodiment 3

[0021] a. Add 10Kg of nylon 1212 pellets to 100Kg of dimethyl sulfoxide, stir at 170°C for 1.0h under a pressure of 2.0MPa, and then cool down. The cooling method adopts three stages of cooling, and the rate of the first stage is: Cool down to 110°C at 1.4°C / min; slowly cool down to 100°C at 0.12°C / min in the second stage; quickly cool down to room temperature at 1.5°C / min in the third stage. Centrifugal filtration, drying to obtain nylon 1212 powder, the powder appearance is relatively regular;

[0022] b. Mix the nylon nylon 1212 powder obtained in step 1 with flow aid and antioxidant at a ratio of 1:0.003:0.003, mix evenly and sieve to obtain a nylon 1212 powder for selective laser sintering.

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Abstract

The invention provides a preparation method of nylon powder for selective laser sintering. The preparation method comprises the steps of adopting a precipitation method, and finally separating out solid powder through the processes of dissolution, cooling and precipitation. The method is characterized by being carried out under the condition of the presence of an organic solvent, wherein the cooling process is carried out in three phases, and rapid cooling is carried out to achieve a temperature which is 10 DEG C below than the separation temperature in the first phase; slow cooling is carried out to achieve the separation temperature in the second phase; rapid cooling is carried out to achieve a normal temperature in the third phase. The method is simple and feasible, low in cost, and capable of preparing the nylon powder with regular morphology, good part performance and suitable for SLS sintering.

Description

technical field [0001] The invention provides a method for preparing nylon powder, and the nylon powder prepared by the method is especially suitable for selective laser sintering technology. Background technique [0002] Selective Laser Sintering (SLS) is one of the fastest-growing rapid prototyping technologies in recent years. It uses solid powder as raw material and uses laser to scan the cross-section of a three-dimensional entity layer by layer to complete prototype manufacturing. Limited by the complexity of the shape of the parts, it can accurately and quickly restore the design concept, quickly produce functional test pieces of new products, and produce complex parts in small batches, breaking through the limitations of traditional manufacturing technology. [0003] Theoretically, any powder of crystalline or semi-crystalline material can be used as SLS sintered material, and a wide range of materials is one of the important factors for the SLS process to be widely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/14C08L77/02C08L77/06
Inventor 许小曙文杰斌范小寒边宏罗秋帆
Owner HUNAN FARSOON HIGH TECH CO LTD
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