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Low-melting-point and low-crystallinity nylon 6 powder for SLS (Selective Laser Sintering) and preparation method of nylon 6 powder

A technology with low crystallinity and low melting point, applied in the field of nylon materials, can solve the problems of low crystallinity, low processing temperature, low melting point and crystallinity, etc., and achieve the effects of good molding accuracy, easy operation and simple preparation method

Inactive Publication Date: 2016-09-21
GUANGDONG SILVER AGE SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings and deficiencies in the prior art, the object of the present invention is to provide a low melting point and low crystallinity nylon 6 powder for SLS, which has a lower melting point and crystallinity, so that it can be processed during processing. There is a lower processing temperature, which makes it better suitable for selective laser sintering; and the reduction of crystallinity can make the scanning section maintain good forming accuracy during the cooling process after laser scanning, without rapid crystallization And produce uneven shrinkage or scanning section warping, which also makes the SLS processed parts have good overall molding dimensional accuracy

Method used

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  • Low-melting-point and low-crystallinity nylon 6 powder for SLS (Selective Laser Sintering) and preparation method of nylon 6 powder
  • Low-melting-point and low-crystallinity nylon 6 powder for SLS (Selective Laser Sintering) and preparation method of nylon 6 powder
  • Low-melting-point and low-crystallinity nylon 6 powder for SLS (Selective Laser Sintering) and preparation method of nylon 6 powder

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A preparation method of nylon 6 powder with low melting point and low crystallinity for SLS, comprising the following preparation steps:

[0048] Step 1. Weigh 98 parts by weight of nylon 6 pellets and 2 parts by weight of CaCl powder and mix them evenly after drying, extrude and granulate using a twin-screw extruder, the screw speed is 150r / min, and the temperature is controlled at 200°C;

[0049] Step 2, pulverize and sieve the granules obtained in step 1 to obtain powder particles with a particle size of 20 μm;

[0050] Step 3: Mix the powder particles obtained in step 2 with fumed silica and antioxidant 9228 in a weight ratio of 1:0.003:0.003, and sieve to obtain nylon 6 powder with a particle size of 20 μm.

Embodiment 2

[0052] A preparation method of nylon 6 powder with low melting point and low crystallinity for SLS, comprising the following preparation steps:

[0053] Step 1. Weigh 96 parts by weight of nylon 6 pellets and 4 parts by weight of CaSO4 powder, mix them evenly after drying, and extrude and granulate using a twin-screw extruder, the screw speed is 160r / min, and the temperature is controlled at 220°C;

[0054] Step 2, pulverize and sieve the granules obtained in step 1 to obtain powder particles with a particle size of 60 μm;

[0055] Step 3: Mix the powder particles obtained in Step 2 with fumed silica and antioxidant 1098 in a weight ratio of 1:0.004:0.004, and sieve to obtain nylon 6 powder with a particle size of 60 μm.

Embodiment 3

[0057] A preparation method of nylon 6 powder with low melting point and low crystallinity for SLS, comprising the following preparation steps:

[0058] Step 1. Weigh 94 parts by weight of nylon 6 pellets and 6 parts by weight of CaCl powder and mix them evenly after drying, and extrude and granulate by a twin-screw extruder, the screw speed is 170r / min, and the temperature is controlled at 250°C;

[0059] Step 2, pulverize and sieve the granules obtained in step 1 to obtain powder particles with a particle size of 80 μm;

[0060] Step 3: Mix the powder particles obtained in step 2 with fumed silica and antioxidant 9228 in a weight ratio of 1:0.005:0.005, and sieve to obtain nylon 6 powder with a particle size of 80 μm.

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Abstract

The invention relates to the technical field of nylon materials for SLS (Selective Laser Sintering), in particular to low-melting-point and low-crystallinity nylon 6 powder for SLS and a preparation method of the nylon 6 powder. The nylon 6 powder is prepared from the following raw materials in parts by weight: 93-98 parts of nylon 6 granules, 7-2 parts of metal ion salt and 0.4-1 part of aids. The preparation method comprises steps as follows: step one, the nylon 6 granules and the metal ion salt powder are weighed in parts by weight, dried, mixed uniformly and extruded and granulated with a double-screw extruder, the rotating speed of screws is 150-170 r / min, and the temperature is controlled to be 200-250 DEG C; step two, the granules obtained in the step one are smashed and sieved, and powdery granules with diameter being 20-120 mu m are obtained; step three, the powdery granules obtained in the step two and the aids are uniformly mixed in proportion and sieved , and the nylon 6 powder with diameter being 20-120 mu m is obtained. The nylon 6 powder has lower melting point and lower crystallinity, and a product obtained through SLS has a good overall forming effect and high size precision.

Description

technical field [0001] The invention relates to the technical field of nylon materials used for SLS, in particular to a nylon 6 powder with low melting point and low crystallinity used for SLS and a preparation method thereof. Background technique [0002] Selective Laser Sintering (SLS) is one of the most rapidly developing 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. SLS parts are not limited by the complexity of the shape of the parts, and can accurately and quickly restore design concepts, quickly produce functional test pieces for 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 sintering material, and the wide range of materials is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08K3/16C08K3/36C08K3/30
CPCC08K3/16C08K3/30C08K3/36C08K2003/162C08K2003/3045C08L77/02
Inventor 刘映坚傅轶洪浩然黄志轩王雁国汪艳
Owner GUANGDONG SILVER AGE SCI & TECH CO LTD
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