A kind of polypropylene powder for selective laser sintering and its preparation method

A technology of laser sintering and polypropylene, which is applied in the field of 3D printing technology and plastic processing, can solve the problems of lack of literature and reports, and achieve the effect of moderate size, simple operation steps and smooth surface

Active Publication Date: 2019-08-30
HENAN INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polypropylene has not been practically used in SLS, and related literature and reports are very scarce.

Method used

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  • A kind of polypropylene powder for selective laser sintering and its preparation method
  • A kind of polypropylene powder for selective laser sintering and its preparation method
  • A kind of polypropylene powder for selective laser sintering and its preparation method

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preparation example Construction

[0030] In the preparation method involved in the present invention, the polypropylene includes a polymer obtained by polymerizing propylene alone or copolymerizing propylene and other olefins, and a blend of the above-mentioned polyolefins.

[0031] In the preparation method involved in the present invention, the polypropylene solvent is a solvent for dissolving polypropylene.

[0032] In the preparation method involved in the present invention, the polypropylene solvent is preferably selected from one or both of toluene, xylene, diphenyl ether, butyl acetate, isoamyl acetate, n-heptane, n-octane, and decahydronaphthalene. A combination of more than one, more preferably one or a combination of two or more selected from xylene, isoamyl acetate, and n-heptane.

[0033] Polypropylene solution refers to the uniform and transparent mixture of polypropylene and polypropylene solvent, and the polypropylene polymer chain is well dispersed in the polypropylene solvent.

[0034] Emulsifi...

Embodiment 1

[0056] The polypropylene powder for selective laser sintering of the present embodiment is made of the following raw materials: 100 grams of polypropylene solvent (xylene), 0.1 to 60 parts of polypropylene (PP1), polar solvent (ethylene glycol) ) 100-400 parts, emulsifier (Tween80) 0.1-4 parts, antioxidant 1010 0.01-0.2 parts, auxiliary agent (silicon dioxide) 0.001-20 parts.

[0057] The preparation method of the polypropylene powder for selective laser sintering of the present embodiment is as follows:

[0058] (1) 15 grams of PP1 and 100 grams of xylene are added to a 500 milliliter flask;

[0059] (2) Stir at a constant temperature of 150°C for 60 minutes, and the stirring rate is 100 rpm, and PP1 is completely dissolved in xylene to form a polypropylene solution;

[0060] (3) Then add Tween80-ethylene triol solution dropwise (Tween80 is 1.5 grams, ethylene glycol is 100 grams), the rate of addition is 30 drops / minute, continue stirring for 10 minutes after the addition i...

Embodiment 2-7

[0074] Embodiment 2-7 adopts the preparation method of polypropylene powder for selective laser sintering provided by the present invention to prepare polypropylene powder, and the following are the basic preparation steps:

[0075] (1) add polypropylene and polypropylene solvent in reaction vessel;

[0076] (2) Heating to 80-180°C under stirring, the polypropylene is completely dissolved in the polypropylene solvent to form a polypropylene solution, and the constant temperature stirring is continued for 10-60 minutes, and the stirring rate is 30-200 rpm;

[0077] (3) Add the solution composed of emulsifier and polar solvent drop by drop under stirring condition, the dropping rate is controlled at 1-60 drops / minute, and continue to stir for 10 minutes after the dropping is completed to form a uniform and transparent solution;

[0078] (4) The solution is cooled to room temperature, and an insoluble precipitate is formed in the solution to obtain a solid-liquid mixture;

[007...

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Abstract

The invention discloses polypropylene powder for selective laser sintering and a preparation method thereof. The polypropylene powder for selective laser sintering is prepared from the following raw materials in parts by weight: 100 parts of a polypropylene solvent, 0.1-60 parts of polypropylene, 100-400 parts of a polar solvent, 0.1-4 parts of an emulsifier, 0.01-0.2 part of an antioxidant and 0.001-20 parts of an auxiliary agent. The preparation method comprises the following step of adding an emulsifier polar solution into a high temperature polypropylene solution for phase reversion emulsification to prepare micron spherical polypropylene powder. The preparation method is simple in step and easy to operate, and can obtain the polypropylene powder suitable for selective laser sintering in shape and character. Compared with existing polypropylene powder for SLS, the sphericility and the flowability are remarkably enhanced, and the prepared polypropylene powder is high in sphericility and power flowability and is quite smooth in surface. The polypropylene powder for a selective laser sintering technology can be easily used to prepare a mold product which is small in dimensional error, few in holes, uniform in shape and good in mechanical property.

Description

technical field [0001] The invention belongs to the fields of 3D printing technology and plastic processing, and in particular relates to a polypropylene powder for selective laser sintering and a preparation method thereof. Background technique [0002] 3D printing technology is a manufacturing technology with "industrial revolution significance", which involves information technology, material science, precision machinery and other aspects, and is becoming more and more competitive in today's manufacturing industry. According to different manufacturing methods and raw materials, 3D printing technology can be divided into fused deposition modeling, selective laser sintering, stereolithography and other technologies. 3D printing technology has greatly expanded the method of material forming, and can quickly manufacture three-dimensional solid parts with complex shapes without molds and fixtures. [0003] Among them, Selective Laser Sintering (Selective Laser Sintering, SLS)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L23/16C08K13/02C08K5/134C08K5/526C08K5/098C08K3/22C08K3/36C08J3/12C08J3/09B33Y70/00
Inventor 于翔李玥王娜王延伟辛长征
Owner HENAN INST OF ENG
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