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Polypropylene powder for selective laser sintering and preparation thereof

A technology of laser sintering and polypropylene, applied in the direction of additive processing, etc., can solve the problems of increasing the production cost of emulsification and evaporation solvent method, affecting the performance of polymer powder, difficult to remove stabilizers and emulsifiers, etc., to achieve particle size distribution and Improved fluidity, high sphericity, and good fluidity

Inactive Publication Date: 2017-10-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the evaporation of the solvent takes a long time, which increases the production cost of the emulsification evaporation solvent method
The chemical polymerization method has a long preparation period, and the stabilizers and emulsifiers used in the polymerization process are difficult to remove, which will affect the performance of the polymer powder.

Method used

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  • Polypropylene powder for selective laser sintering and preparation thereof
  • Polypropylene powder for selective laser sintering and preparation thereof
  • Polypropylene powder for selective laser sintering and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Add 3 grams of polypropylene material (product brand Y3700C, whose melt index is 40g / 10min as measured by the above method) and 100 milliliters of xylene into a 250 milliliter flask, heat the flask to 145°C, and stir at this temperature For 60 minutes, the stirring speed was 50 rpm to form a homogeneous polypropylene solution. Quickly put the flask containing the polypropylene solution into an ice-water bath at 0°C to quench, and continue to stand at this temperature for 30 minutes. It can be observed that polypropylene particles are precipitated from the solution, filtered, washed, and dried to obtain poly Propylene powder (referred to as PP powder). Sieve the PP powder and collect the PP powder with a particle size in the range of 100-800 mesh. Its appearance is as follows: figure 1 shown. It is determined that the prepared polypropylene powder has a particle size of 16-86 μm, a particle size distribution of D10=17 μm, D50=53 μm, and D90=75 μm. The bulk density of ...

Embodiment 2

[0053] Add 1 gram of polypropylene material (product brand V30S, melt index: 10g / 10min) and 10 liters of xylene into a 25-liter reactor, heat the flask to 145°C, and stir at this temperature for 60 minutes at a constant temperature. at 30 rpm to form a homogeneous polypropylene solution. Pass an ice-water bath at 0°C into the jacket of the reaction kettle to quench the polypropylene solution, and continue to stand at this temperature for 30 minutes. It can be observed that the polypropylene particles are precipitated from the solution, and are suction filtered, washed and dried. , to obtain PP powder. Sieve the PP powder and collect the PP powder with a particle size in the range of 100-800 mesh. Its appearance is as follows: figure 2 shown. It is determined that the prepared polypropylene powder has a particle size of 10-78 μm, a particle size distribution of D10=15 μm, D50=30 μm, and D90=70 μm. The bulk density of polypropylene powder is 0.60g / cm 3 . The sphericity of ...

Embodiment 3

[0055] Add 30 grams of polypropylene material (product brand Y3700C, melt index: 35g / 10min) and 100 milliliters of diphenyl ether into a 250 milliliter flask, heat the flask to 150 ° C, and stir at this temperature for 60 minutes at a constant temperature. at 10 rpm to form a homogeneous polypropylene solution. Quickly put the flask containing the polypropylene solution into liquid nitrogen at -195°C to quench, and continue to stand at this temperature for 60 minutes. It can be observed that the polypropylene particles are precipitated from the solution, and filtered, washed and dried to obtain PP powder. Sieve the PP powder and collect the PP powder with a particle size in the range of 100-800 mesh. Its appearance is as follows: image 3 shown. It is determined that the prepared polypropylene powder has a particle size of 12-83 μm, a particle size distribution of D10=17 μm, D50=39 μm, and D90=72 μm. The bulk density of polypropylene powder is 0.54g / cm 3 . The sphericity ...

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Abstract

The invention provides polypropylene for selective laser sintering, which is spherical and / or sphere-like granules having a degree of sphericity of 0.6-1.0, sizes of 10-100mu m and grain distribution D10 of 10-25mu m, D50 being 30-60mu m and D90 being 70-95mu m. The invention further provides a method for preparing the polypropylene powder, which comprises the following steps: mixing a polypropylene material with an organic solvent for dissolving the polypropylene material, heating under a stirring state to a target heating temperature, and continuing stirring at constant temperature to form a polypropylene solution; (2) quenching the polypropylene solution to the target quenching temperature, standing at a constant temperature until precipitate is generated in the solution; and (3) separating the precipitate, washing and drying to obtain the polypropylene powder.

Description

technical field [0001] The invention relates to the technical field of polymer processing, in particular to a polypropylene powder for selective laser sintering and a preparation method thereof. Background technique [0002] Selective Laser Sintering (SLS for short) is one of the most widely used 3D printing technologies at present. It uses solid powder as raw material, according to the computer-aided design (CAD) model, through layered manufacturing superposition, using laser selective The sintered powder material is shaped into a three-dimensional solid. SLS is not limited by the complexity of the shape of parts. It can accurately and quickly restore the design concept, quickly produce functional test pieces of new products, and produce complex parts in small batches, breaking through the limitations of traditional manufacturing technology. SLS has the advantages of a wide range of molding materials, a wide range of applications, high material utilization and no need for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/14B33Y70/00
CPCC08J3/14B33Y70/00C08J2323/12
Inventor 王绍杰刘建叶吴长江张师军邹浩张丽英初立秋高达利董穆邵静波吕芸徐毅辉
Owner CHINA PETROLEUM & CHEM CORP
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