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Nylon powder and preparation method thereof, and nylon composite material

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

Active Publication Date: 2017-03-08
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 present invention provides a method for preparing nylon powder. The method includes dissolving nylon pellets in a main solvent in a protective atmosphere, then adding an auxiliary solvent, and after mixing, the temperature is lowered to crystallization at a rate of 0.1-0.3°C / min Crystals are precipitated at temperature, and after the crystallization is completed, the nylon powder is obtained by reducing to room temperature; the volume ratio of the main solvent and 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 have obtained through a large number of experiments that the volume ratio of the main solvent and the auxiliary solvent of 4-10:1 can form crystal nuclei relatively easily, and the crystallization speed is also suitable. If the volume ratio is greater than 4-10:1, it is difficult to form a saturated solution, which will further make it diffi...

Embodiment 1

[0045] Place 100 g nylon 12 pellets and 1000 mL 2-methylpyrrolidone (NMP) in a reactor, fill with nitrogen to a pressure of 0.8 MPa, and then heat to 142°C, stir at a constant temperature of 120 RPM 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 completed, keep stirring for 30 minutes, and then lower the temperature 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 nylon powder A1 and an ethanol solution containing 0.5g of antioxidant (BASF's antioxidant Irganox 1010) and mix them uniformly, dry in vacuum, and then stir the resulting powder and 0.3g of flow aid (RTM892 from Degussa) Stir evenly in the vessel to obtain...

Embodiment 2

[0048] Place 100 g nylon 1212 pellets and 1000 mL 2-methylpyrrolidone (NMP) in a reactor, fill with nitrogen to a pressure of 0.8 MPa, and then heat to 145°C, stir at a constant temperature of 115 RPM for 2 hours to dissolve the nylon pellets. Then slowly add 200 mL of ethylene glycol preheated to 100°C in 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 completed, keep stirring for 30 minutes, and then lower the temperature 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 nylon powder A2 and an ethanol solution containing 0.5g of antioxidant (Irganox 1010 from BASF) and mix them uniformly, dry in vacuum, and then combine the resulting powder and 0.3g of flow aid (RTM 892 from Degussa) Stir evenly in a stirrer to obtain nylon c...

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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 specifically relates to a nylon powder and 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 "layered manufacturing, layer by layer". A three-dimensional model made by design or scanning is cut into many according to a certain coordinate axis. Each profile is printed layer by layer using powdered metal or plastic, ceramic and other adhesive materials to manufacture articles. It has the advantages of short manufacturing cycle, low production cost, high material utilization, and no need for support. The difficulty of design and manufacturing has realized "free manufacturing". [0003] Nylon is a polymer material commonly used in SLS rapid prototyping, and its parts have superior properties in terms of strength and deformability. At present, the most widely used method ...

Claims

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Application Information

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IPC IPC(8): C08J3/12C08L77/02C08L77/06B33Y70/00
Inventor 黄少华
Owner BYD CO LTD
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