A kind of preparation method of nylon powder for selective laser sintering

Abstract

The invention discloses a preparation method of nylon powder for selective laser sintering. The preparation method comprises: mixing nylon particles, a dispersant, a nucleating agent and the good solvent of nylon to form a homogeneous transparent solution, stirring while adding the poor solvent of nylon in a dropwise manner to precipitate the nylon, heating to obtain a transparent solution again,rapidly cooling, carrying out crystallization precipitation, filtering, washing, and drying to obtain the product. Compared to the preparation method in the prior art, the preparation method of the invention has advantages of no requirement of high temperature and high pressure equipment, simple process, convenient operation and easy implementation. In addition, the prepared powder material has characteristics of uniform morphology, compact structure, smooth surface and good fluidity, and is suitable for the molding of selective laser sintering materials.

Description

Technical field

[0001] The invention relates to 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 (SLS) is currently one of the most widely used rapid prototyping technologies for 3D printing-additive manufacturing. It adopts the idea of ​​layered manufacturing and uses solid powder as raw materials to directly shape three-dimensional solid parts. Its unique manufacturing method has subverted the current manufacturing industry and has become one of the most concerned emerging technologies in the world. It is known as "manufacturing technology with industrial revolution significance" and is widely used in industrial modeling, machinery manufacturing, mold manufacturing, Aerospace, military, architecture, home appliances, biomedicine, art design, sculpture, and other fields. Nylon is an important general engineering plastic variety. It has good comprehensive properti...

Examples

Embodiment 1

[0039]100g nylon 6 pellets, 1g polyvinyl alcohol (PVA), 1g lithium benzoate, and 1000ml formic acid were added to the reaction kettle, and stirred at 1200r / min stirring speed for 2h at room temperature to completely dissolve the materials to form a homogeneous transparent solution. Add deionized water uniformly under the condition of 120 drops / min until the system becomes milky white. The temperature of the system is increased to 80°C, and the system becomes a homogeneous transparent solution again, and then the reaction kettle is placed in a constant temperature water bath at 5°C to cool rapidly, and the powder is precipitated After filtering and washing several times until the pH of the supernatant is 7, then drying and passing through a 200-mesh sieve to obtain nylon 6 powder for selective sintering.

Embodiment 2

[0041]100g nylon 6 pellets, 0.5g polyvinyl alcohol (PVA), 0.5g lithium benzoate, and 800ml formic acid were added to the reaction kettle, and stirred for 2h at a stirring speed of 1000r / min at room temperature to completely dissolve the materials and form a homogeneous transparent solution. Then uniformly add deionized water under the condition of 80 drops / min until the system becomes milky white. The temperature of the system is increased to 120°C, the system becomes a homogeneous transparent solution again, and then the reaction kettle is placed in a constant temperature water bath at 0°C to cool quickly. The powder is separated out, filtered and washed several times until the pH of the supernatant is 7 and then dried and passed through a 200-mesh sieve to obtain nylon 6 powder for selective sintering.

Embodiment 3

[0043]100g nylon 12 pellets, 1g Span 80, 1g lithium benzoate, 1000ml trifluoroacetic acid were added to the reaction kettle, and stirred at 1200r / min stirring speed for 2h at room temperature to completely dissolve the materials to form a homogeneous transparent solution. Add deionized water uniformly under the condition of drops / min until the system becomes milky white. The temperature of the system is increased to 70°C, and the system becomes a homogeneous transparent solution again. Then the reaction kettle is placed in a constant temperature water bath at 5°C to cool rapidly, and the powder is precipitated. After filtering and washing several times until the pH of the supernatant is 7, it is dried and passed through a 200-mesh sieve to obtain nylon 6 powder for selective sintering.

Technical field

[0001] The invention relates to 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 (SLS) is currently one of the most widely used rapid prototyping technologies for 3D printing-additive manufacturing. It adopts the idea of ​​layered manufacturing and uses solid powder as raw materials to directly shape three-dimensional solid parts. Its unique manufacturing method has subverted the current manufacturing industry and has become one of the most concerned emerging technologies in the world. It is known as "manufacturing technology with industrial revolution significance" and is widely used in industrial modeling, machinery manufacturing, mold manufacturing, Aerospace, military, architecture, home appliances, biomedicine, art design, sculpture, and other fields. Nylon is an important general engineering plastic variety. It has good comprehensive properti...

Examples

Embodiment 1

[0039]100g nylon 6 pellets, 1g polyvinyl alcohol (PVA), 1g lithium benzoate, and 1000ml formic acid were added to the reaction kettle, and stirred at 1200r / min stirring speed for 2h at room temperature to completely dissolve the materials to form a homogeneous transparent solution. Add deionized water uniformly under the condition of 120 drops / min until the system becomes milky white. The temperature of the system is increased to 80°C, and the system becomes a homogeneous transparent solution again, and then the reaction kettle is placed in a constant temperature water bath at 5°C to cool rapidly, and the powder is precipitated After filtering and washing several times until the pH of the supernatant is 7, then drying and passing through a 200-mesh sieve to obtain nylon 6 powder for selective sintering.

Embodiment 2

[0041]100g nylon 6 pellets, 0.5g polyvinyl alcohol (PVA), 0.5g lithium benzoate, and 800ml formic acid were added to the reaction kettle, and stirred for 2h at a stirring speed of 1000r / min at room temperature to completely dissolve the materials and form a homogeneous transparent solution. Then uniformly add deionized water under the condition of 80 drops / min until the system becomes milky white. The temperature of the system is increased to 120°C, the system becomes a homogeneous transparent solution again, and then the reaction kettle is placed in a constant temperature water bath at 0°C to cool quickly. The powder is separated out, filtered and washed several times until the pH of the supernatant is 7 and then dried and passed through a 200-mesh sieve to obtain nylon 6 powder for selective sintering.

Embodiment 3

[0043]100g nylon 12 pellets, 1g Span 80, 1g lithium benzoate, 1000ml trifluoroacetic acid were added to the reaction kettle, and stirred at 1200r / min stirring speed for 2h at room temperature to completely dissolve the materials to form a homogeneous transparent solution. Add deionized water uniformly under the condition of drops / min until the system becomes milky white. The temperature of the system is increased to 70°C, and the system becomes a homogeneous transparent solution again. Then the reaction kettle is placed in a constant temperature water bath at 5°C to cool rapidly, and the powder is precipitated. After filtering and washing several times until the pH of the supernatant is 7, it is dried and passed through a 200-mesh sieve to obtain nylon 6 powder for selective sintering.

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