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A kind of nylon powder and its preparation method and nylon composite material

A nylon powder and composite material technology, applied in the field of 3D printing, can solve the problems of narrow particle size distribution, low density, and wide nylon particle size distribution.

Active Publication Date: 2019-07-26
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to overcome the problem of wide particle size distribution and low density of nylon produced by solvent method in the above-mentioned prior art, and provide a kind of nylon powder with narrow particle size distribution and high density and its preparation method and nylon composite material.

Method used

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Effect test

preparation example Construction

[0015] The invention provides a method for preparing nylon powder. The method comprises dissolving nylon pellets in a main solvent in a protective atmosphere, then adding an auxiliary solvent, and cooling down to crystallization at a speed of 0.1-0.3°C / min after mixing. The temperature precipitates crystals, and after the crystallization is completed, the nylon powder is obtained when the temperature is lowered to room temperature; the volume ratio of the main solvent to the auxiliary solvent is 4-10:1; the main solvent is an amide solvent, and the auxiliary solvent is water and / or alcohol.

[0016] In the present invention, the inventors obtained through a large number of experiments that the volume ratio of the main solvent to the auxiliary solvent is 4-10:1, which can easily form crystal nuclei, and the crystallization speed is also relatively appropriate. If the volume ratio is greater than 4-10:1, it is difficult to form a saturated solution, which further makes it diffic...

Embodiment 1

[0045]100g of nylon 12 pellets and 1000mL of 2-methylpyrrolidone (NMP) were placed in a reactor, filled with nitrogen to a pressure of 0.8MPa, then heated to 142°C, and stirred at a constant temperature of 120RPM for 2 hours to dissolve the nylon pellets. Then slowly add 200 mL of ethylene glycol preheated to 100°C within 1 hour, stir at constant temperature for 1 hour, keep the stirring speed constant, and cool down to 123°C at a rate of 0.1°C / min to precipitate crystals. After the crystallization is complete, keep stirring for 30 minutes, and then cool down to room temperature. Filter, wash, and vacuum-dry to obtain nylon powder A1 (d10: 40 μm, d50: 59 μm, d90: 88 μm; bulk density: 0.38 g / ml).

[0046] Take 100g of the above-mentioned nylon powder A1 and an ethanol solution containing 0.5g of antioxidant (BASF's antioxidant Irganox 1010), mix evenly, dry in vacuum, and then mix the obtained powder and 0.3g of flow aid (RTM892 from Degussa) under stirring Stir evenly in an a...

Embodiment 2

[0048] 100g of nylon 1212 pellets and 1000mL of 2-methylpyrrolidone (NMP) were placed in a reaction kettle, filled with nitrogen to a pressure of 0.8MPa, then heated to 145°C, and stirred at a constant temperature of 115RPM for 2 hours to dissolve the nylon pellets. Then slowly add 200 mL of ethylene glycol preheated to 100°C within 1 hour, stir at constant temperature for 1 hour, keep the stirring speed constant, and cool down to 123°C at a rate of 0.2°C / min to precipitate crystals. After the crystallization is complete, keep stirring for 30 minutes, and then cool down to room temperature. Filter, wash, and vacuum-dry to obtain nylon powder A2 (d10: 40 μm, d50: 62 μm, d90: 90 μm; bulk density: 0.40 g / ml).

[0049] Take 100g of the above-mentioned nylon powder A2 and an ethanol solution containing 0.5g antioxidant (antioxidant Irganox 1010 from BASF) and mix evenly, dry in vacuum, then mix the obtained powder with 0.3g flow aid (RTM 892 from Degussa) Stir evenly in a stirrer ...

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Abstract

The invention provides a nylon powder and a preparation method thereof, and a nylon composite material. The method comprises the following steps: dissolving nylon granules in a main solvent in a protective atmosphere, adding an auxiliary solvent, mixing, and cooling to the recrystallization temperature at the rate of 0.1-0.3 DEG C / minute to precipitate a crystal; and after the crystallization finishes, cooling to room temperature to obtain the nylon powder, wherein the volume ratio of the main solvent to the auxiliary solvent is (4-10):1, the main solvent is an amide solvent, and the auxiliary solvent is water and / or alcohol. The nylon powder prepared by the method has the advantages of narrow particle size distribution and high density, and is more suitable for 3D printing.

Description

technical field [0001] The invention belongs to the field of 3D printing, and in particular relates to a nylon powder, a preparation method thereof, and a nylon composite material. Background technique [0002] Selective laser sintering (SLS) is a kind of rapid prototyping technology. Its basic principle is "layer-by-layer manufacturing, layer-by-layer superposition". A three-dimensional model made by design or scanning is cut into many A cross-section, using powdered metal or plastic, ceramics and other adhesive materials to manufacture objects by layer-by-layer printing, has the advantages of short manufacturing cycle, low production cost, high material utilization rate, and no need for support, reducing the The difficulty of design and manufacture has realized "free manufacture". [0003] Nylon is a polymer material commonly used in SLS rapid prototyping, and its parts have superior performance in terms of strength and deformability. At present, the most widely used met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/12C08L77/02C08L77/06B33Y70/00
Inventor 黄少华
Owner BYD CO LTD
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