Preparation method capable of controlling polyamide powder melt flow index

A melt flow index, polyamide powder technology, applied in the field of additive manufacturing, can solve the problems of low melt flow index of polyamide powder, reduced powder melt flow index, insufficient flow, etc., so as to improve mechanical properties and surface quality, improve the melt flow index, reduce the effect of environmental pollution

Active Publication Date: 2019-10-08
HUNAN FARSOON HIGH TECH CO LTD
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Polyamide powder is one of the main raw materials for selective laser sintering technology to manufacture three-dimensional objects. However, the selective laser sintering of polyamide powder in actual production often has poor surface quality and low reusability, which affects the appearance and One of the reasons for this problem is that the melt flow index of polyamide powder is low
In the selective laser sintering process, the time interval between laser scanning and the next layer of powder coating is short. If the polyamide po

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method capable of controlling polyamide powder melt flow index
  • Preparation method capable of controlling polyamide powder melt flow index
  • Preparation method capable of controlling polyamide powder melt flow index

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] 4Kg of PA1212 resin and 32Kg of ethanol were put into the 40L reaction kettle, and high-purity nitrogen gas was introduced to a pressure of 0.3MPa, and the temperature was raised to 110°C with continuous stirring and heating. At this time, the PA1212 resin was completely dissolved in ethanol, and then continued to be heated to a reaction temperature of 140°C. ℃ and keep it for a certain period of time, then use cooling water to cool down, so that the temperature in the kettle drops to 80 ℃ at an average cooling rate of 0.8 ℃ / min, increase the cooling water flow to make the temperature in the kettle drop to room temperature, take out the material, centrifuge, dry The PA1212 powder sample can be obtained. During the heating and cooling process in this example, the entire reaction process is kept above 110° C. for 180 minutes. The MFR of PA1212 powder was tested, and the parts were printed on the ST252 equipment of Farsoon High-tech in Hunan to test the ...

Example Embodiment

[0028] Example 2

[0029] 4Kg of PA1212 resin and 32Kg of ethanol were put into the 40L reactor, high-purity nitrogen was introduced to a pressure of 0.3MPa, and the temperature was raised to 110°C with continuous stirring and heating. At this moment, the PA1212 resin was completely dissolved in ethanol, and then continued to be heated to a reaction temperature of 145°C. ℃ and keep it for a certain period of time, then use cooling water to cool down, so that the temperature in the kettle drops to 80 ℃ at an average cooling rate of 0.8 ℃ / min, increase the cooling water flow to make the temperature in the kettle drop to room temperature, take out the material, centrifuge, dry The PA1212 powder sample can be obtained. During the heating and cooling process in this example, the entire reaction process is kept above 110° C. for 180 minutes. The MFR of PA1212 powder was tested, and the parts were printed on the ST252 equipment of Farsoon High-tech in Hunan to test the mechanical pro...

Example Embodiment

[0030] Example 3

[0031] 4Kg of PA1212 resin and 32Kg of ethanol were put into the 40L reactor, and high-purity nitrogen was introduced to a pressure of 0.3MPa, and the temperature was raised to 110°C with continuous stirring and heating. At this time, the PA1212 resin was completely dissolved in ethanol, and then continued to be heated to a reaction temperature of 150°C. ℃ and keep it for a certain period of time, then use cooling water to cool down, so that the temperature in the kettle drops to 80 ℃ at an average cooling rate of 0.8 ℃ / min, increase the cooling water flow to make the temperature in the kettle drop to room temperature, take out the material, centrifuge, dry The PA1212 powder sample can be obtained. During the heating and cooling process in this example, the entire reaction process is kept above 110° C. for 180 minutes. The MFR of PA1212 powder was tested, and the parts were printed on the ST252 equipment of Farsoon High-tech in Hunan to test the mechanical p...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a preparation method capable of controlling polyamide powder melt flow index. The polyamide powder is obtained by steps: adding polyamide resin, a solvent and additives in a closed high-pressure reactor, leading in inert gas for protection, stirring continuously, heating to rise temperature until polyamide resin is dissolved in the solvent, continuing to rise temperature toreach the reaction temperature, holding the reaction temperature for a certain time, cooling to the room temperature, filtering by extraction, and drying finally; the polyamide powder melt flow indexis increased by increasing the reaction temperature and prolonging the time of duration of the reaction temperature that is higher than the dissolving temperature in the reaction. By the preparation method, the molecular weight of polyamide powder can be reduced in the preparation process thereof so that the melt flow index of the polyamide powder can be increased to improve processability of thepolyamide powder during the selective laser sintering, achieve excellent melt flowability of the polyamide powder after laser scanning, reduce internal defects of workpieces, improve mechanical property of the workpieces, improve surface quality of the workpieces and improve recyclability of the polyamide powder.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a preparation method for controlling the melt flow index of polyamide powder. Background technique [0002] Selective laser sintering is a method of manufacturing three-dimensional objects by selectively fusing multiple layers of powder, which allows machining without tools but only by laser sintering multiple overlapping layers of powder according to the three-dimensional image of the object to be produced, to get a 3D solid. [0003] Selective laser sintering technology can prepare products with any complex structure within the size range, which is very effective for sample design, testing and even small batch manufacturing in the production process during the research and development process, but this manufacturing method will bring precision compared to traditional processes In many fields, users are very concerned about the surface quality and mec...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C08J3/00C08L77/06C08K5/13C08K5/20C08K5/526
CPCC08J3/00C08J2377/06C08K5/13C08K5/20C08K5/526
Inventor 谭锐罗秋帆袁博陈亮斌
Owner HUNAN FARSOON HIGH TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap