Polypropylene powder for selective laser sintering and its preparation

A technology of laser sintering and polypropylene, applied in the direction of additive processing, etc., can solve the problems of restricting the application of PP powder to the performance of sintered parts, the irregular shape of polypropylene powder, and the difficulty of PP mixing evenly, and achieve high sphericity and good fluidity , the effect of uniform particle shape

Active Publication Date: 2019-08-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both the solution recrystallization method and the low-temperature mechanical pulverization method to prepare polypropylene powder have the problems of irregular shape and poor sphericity, which limit the application of PP powder in SLS and the improvement of the performance of sintered parts.
In addition, the addition of other ingredients in PP powder is usually added by stirring after powder preparation, and it is difficult to mix the ingredients with PP evenly

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] With 6 grams of polypropylene material (product brand PP-H-GD450, the melt index measured according to the above method is 45g / 10min), 0.06 gram of sodium dodecylsulfonate (abbreviated as SDS, analytically pure) and 100 milliliters of xylene Add it into a 250 ml flask, heat the flask to 145°C, and keep stirring at this temperature for 60 minutes 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 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 5 shown. It is determined that the prepared PP powder has a particle size of 20-88 μm, a particle size distribution of D10=22 μm, D50=41 μm, and D90=74 μm. The...

Embodiment 2

[0059] 6 grams of polypropylene material (product designation PP-H-GD450, melt index is 45g / 10min), 0.3 grams of SDS and 100 milliliters of xylene are added in a 250 milliliter flask, and the flask is heated to 145 ° C. Stir at constant temperature for 60 minutes 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 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 6 shown. It is determined that the prepared PP powder has a particle size of 21-85 μm, a particle size distribution of D10=24 μm, D50=39 μm, and D90=72 μm. The bulk density of PP powder is 0.55g / cm 3 .

[0060] Analyze by DSC method according to the...

Embodiment 3

[0062] 6 grams of polypropylene material (product designation PP-H-GD450, melt index is 45g / 10min), 0.6 gram of SDS and 100 milliliters of dimethylbenzene are added in the 250 milliliter flask, heat this flask to 148 ℃, under this temperature condition Stir at constant temperature for 60 minutes to form a homogeneous polypropylene solution. Quickly put the flask containing the polypropylene solution into liquid nitrogen at -185°C to quench, and continue to stand at this temperature for 60 minutes. It can be observed that polypropylene particles are precipitated from the solution, 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 3shown. It is determined that the prepared PP powder has a particle size of 21-80 μm, a particle size distribution of D10=23 μm, D50=45 μm, and D90=71 μm. The bulk density of PP powder is 0.55g / cm 3 .

[0063] Analyz...

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Abstract

The invention provides polypropylene powder for selective laser sintering. The polypropylene is prepared from a polypropylene material and a surfactant, wherein the polypropylene powder is analyzed by a differential scanning calorimetry method, and an obtained DSC analyzing curve has a melting peak respectively between 145 and 155 DEG C and between 160 and 170 DEG C. The invention further provides a method for preparing the polypropylene powder. The method comprises the following steps: (1) mixing the polypropylene material, the surfactant and an organic solvent, 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 a precipitate is generated in the solution; and (3) separating the precipitate, and 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] 3D printing technology, also known as rapid prototyping manufacturing technology, has the common characteristics of "layer-by-layer manufacturing and layer-by-layer superposition". 3D printing technology breaks through the traditional material deformation molding and removal molding process, and can quickly manufacture three-dimensional solid parts of any complex shape without fixtures or molds, and can effectively shorten the product development cycle. 3D printing technology involves many aspects such as information technology, material science, precision machinery, etc. It is becoming more and more competitive in today's manufacturing industry, so it is called "manufacturing technology with industrial revolution significance". [0003] Selective Laser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08J3/12C08J3/11B33Y70/00
Inventor 王绍杰刘建叶吴长江张师军邹浩初立秋吕明福权慧郭鹏徐凯白弈青侴白舸
Owner CHINA PETROLEUM & CHEM CORP
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