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Polypropylene compound powder for selective laser sintering and preparation thereof

A composite powder, laser sintering technology, applied in the field of polymer processing, can solve the problems of limiting the performance of PP powder application sintered parts, irregular shape of polypropylene powder, difficult to mix PP uniformly, etc., to achieve improved strength and toughness, excellent mechanical properties. , the effect of uniform particle shape

Active 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

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 75g of polypropylene powder (the brand name is T30S, and its melt index is 45g / 10min according to the method described above), maleic anhydride grafted polypropylene (melt index is 60g / 10min, and the grafting rate of maleic anhydride is 0.5%, (manufactured by Nanjing Julong Chemical Co., Ltd.) 25g and 1250mL of xylene were added into the reaction kettle (that is, the concentration of polypropylene in the polypropylene solution was 6.0g / 100mL), heated to 148°C under stirring, and kept stirring at this temperature for 60 minutes , the stirring speed is 50 rpm, the polypropylene powder and the maleic anhydride grafted polypropylene powder are completely dissolved in xylene to form a homogeneous polypropylene solution. Fill the 0°C ice-water mixture into the jacket of the reaction kettle to quench the polypropylene solution in the kettle, and continue to stand at this temperature for 60 minutes, and it can be observed that the polypropylene-maleic anhydride grafted polypropy...

Embodiment 2

[0052] Add 75g of polypropylene powder (brand T30S, melt index 45g / 10min), maleic anhydride grafted polypropylene (melt index 60g / 10min, maleic anhydride graft rate 0.5%) 25g and 1250mL xylene to the reaction In the kettle (that is, the concentration of polypropylene in the polypropylene solution is 6.0g / 100mL), heat it to 148°C under stirring, and stir at this temperature for 60 minutes at a constant temperature at a stirring speed of 50 rpm. Polypropylene powder and Malay The anhydride-grafted polypropylene powder is completely dissolved in xylene to form a homogeneous polypropylene solution. Fill the 0°C ice-water mixture into the jacket of the reaction kettle to quench the polypropylene solution in the kettle, and continue to stand at this temperature for 60 minutes, and it can be observed that the polypropylene-maleic anhydride grafted polypropylene The particles are precipitated from the solution, filtered, washed and dried to obtain polypropylene-maleic anhydride grafte...

Embodiment 3

[0055] Add 75g of polypropylene powder (brand T30S, melt index 45g / 10min), maleic anhydride grafted polypropylene (melt index 60g / 10min, maleic anhydride graft rate 0.5%) 25g and 1250mL xylene to the reaction In the kettle (that is, the concentration of polypropylene in the polypropylene solution is 6.0g / 100mL), heat it to 148°C under stirring, and stir at this temperature for 60 minutes at a constant temperature at a stirring speed of 50 rpm. Polypropylene powder and Malay The anhydride-grafted polypropylene powder is completely dissolved in xylene to form a homogeneous polypropylene solution. Fill the 0°C ice-water mixture into the jacket of the reaction kettle to quench the polypropylene solution in the kettle, and continue to stand at this temperature for 60 minutes, and it can be observed that the polypropylene-maleic anhydride grafted polypropylene The particles are precipitated from the solution, filtered, washed and dried to obtain polypropylene-maleic anhydride grafte...

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Abstract

The invention provides polypropylene compound powder for selective laser sintering, which is prepared from the following components in parts by weight: 100 parts of polypropylene-maleic anhydride grafted polypropylene, 0.1-1.0 part of carbon nano-tube, 0.3-1.0 part of flow additive and 0.1-1.0 part of antioxidant. The invention further provides a method for preparing the compound powder, which comprises the following steps: (1) dissolving the polypropylene powder and maleic anhydride grafted polypropylene powder in an organic solvent, heating under a stirring state to a target heating temperature, and continuously stirring at a constant temperature to form a polypropylene solution; (2) quenching the polypropylene solution to a target quenching temperature, standing at a constant temperature until precipitate is generated in the solution; (3) separating the precipitate, washing and drying to obtain the polypropylene-maleic anhydride grafted polypropylene powder; and (4) uniformly mixing and stirring the polypropylene-maleic anhydride grafted polypropylene powder with the carbon nano-tube, the flow additive and the antioxidant.

Description

technical field [0001] The invention relates to the technical field of polymer processing, in particular to a polypropylene composite powder for selective laser sintering and a preparation method thereof. Background technique [0002] Selective Laser Sintering (Selective Laser Sintering, SLS) is a rapid prototyping technology. The computer first scans the three-dimensional entity, and then selectively sinters the material powder pre-laid on the workbench or parts by high-intensity laser irradiation. Layer by layer melting and sintering, and then realize the technology of layer-by-layer molding. SLS has a high degree of design flexibility, can manufacture accurate models and prototypes, can form parts with reliable structures that can be used directly, and has a short production cycle and simple process, so it is especially suitable for the development of new products. At present, SLS is the most widely used and most promising technology in additive manufacturing technology,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/10C08L51/06C08K7/24C08K3/36C08K5/134C08K3/22C08K5/526C08K3/34C08J3/14
CPCC08J3/14C08J2323/10C08J2323/12C08J2323/14C08J2451/06C08K2201/003C08K2201/004C08K2201/011C08L23/10C08L23/12C08L23/14C08L2205/02C08L2205/03C08L2205/18C08L51/06C08K7/24C08K3/36C08K5/1345C08K2003/2227C08K5/526C08K3/34
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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