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PA66/PA6 (Polyamide 66/Polyamide 6) copolymerized material for selective laser sintering and preparation method

A laser sintering and PA66 technology, which is applied in the field of PA66/PA6 copolyamide powder and preparation for selective laser sintering, can solve the problems of high raw material cost, decreased powder reuse performance, high cost of three-dimensional solid parts, and achieves high processing performance and Good mechanical properties, improved fluidity and anti-oxidation properties, and improved recycling rates

Inactive Publication Date: 2017-07-25
HUNAN FARSOON HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the problems in using this technology at present is that the cost of three-dimensional solid parts prepared by this technology is relatively high, which limits commercial promotion to a certain extent
An important reason for the high cost of 3D parts is the high price of materials using this technology
Taking the current mainstream PA12 (Nylon 12) as an example, the raw material cost of PA12 itself is relatively high, and the manufacturing process of PA12 powder material for selective laser sintering is complicated, the production volume of a single batch is small, and the preparation cost is high.
In addition, the powder material undergoes repeated heating during the selective laser sintering process, and the reusability of the powder decreases, resulting in a low overall utilization rate of the powder material, which is also one of the reasons that affect the price

Method used

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  • PA66/PA6 (Polyamide 66/Polyamide 6) copolymerized material for selective laser sintering and preparation method
  • PA66/PA6 (Polyamide 66/Polyamide 6) copolymerized material for selective laser sintering and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add the raw materials hexamethylenediamine adipate, caprolactam, molecular weight modifier, deionized water, and antioxidant into the reaction kettle. Among them, the mass ratio of hexamethylenediamine adipate to caprolactam is 9:1 (calculated as 10 parts), and the percentages of other raw materials in the total mass are: 0.3% for molecular weight modifier, 20% for deionized water, and 20% for antioxidant 1.5%. Close the reaction kettle and remove the gas in the kettle, and then pass in carbon dioxide gas protection until the pressure in the kettle is 0.15MPa. Control the temperature in the kettle to 245°C, the air pressure to 1.6MPa, keep the pressure for 1 hour, then slowly release the gas to normal pressure, raise the temperature in the kettle to 280°C and keep the reaction for 1 hour, stop heating, water-cool the strips to discharge, cut off pellets to obtain copolymerized nylon pellets;

[0029] (2) Cryogenically pulverize the prepared granules, dry, sieve an...

Embodiment 2

[0032](1) Add the raw materials hexamethylenediamine adipate, caprolactam, molecular weight modifier, deionized water, and antioxidant into the reaction kettle. Among them, the mass ratio of hexamethylenediamine adipate to caprolactam is 8:2 (calculated as 10 parts), and the percentages of other raw materials in the total mass are: molecular weight regulator is 0.6%, deionized water is 30%, antistatic Antioxidant is 0.3%, antioxidant is 1.2%. Close the reaction kettle and remove the gas in the kettle, and then pass in carbon dioxide gas protection until the pressure in the kettle is 0.1MPa. Control the temperature in the kettle to 210°C, the air pressure to 1.5MPa, keep the pressure for 1.5 hours, then slowly release the gas to normal pressure, raise the temperature in the kettle to 270°C and keep the reaction for 1.5 hours, stop heating, water-cool the strips to discharge, cut pellets to obtain copolymerized nylon pellets;

[0033] (2) Cryogenically pulverize the prepared g...

Embodiment 3

[0036] (1) Add the raw materials hexamethylenediamine adipate, caprolactam, molecular weight modifier, deionized water, and antioxidant into the reaction kettle. Among them, the mass ratio of hexamethylenediamine adipate to caprolactam is 7:3 (calculated as 10 parts), and the percentages of other raw materials in the total mass are: 0.8% for molecular weight modifier, 40% for deionized water, and 40% for antioxidant 0.8%. Close the reaction kettle and remove the gas in the kettle, and then pass in carbon dioxide gas protection until the pressure in the kettle is 0.12MPa. Control the temperature in the kettle to 200°C, the air pressure to 1.4MPa, keep the pressure for 2 hours, then slowly release the gas to normal pressure, raise the temperature in the kettle to 260°C and keep the reaction for 2 hours, stop heating, water-cool the strips to discharge, cut off pellets to obtain copolymerized nylon pellets;

[0037] (2) Cryogenically pulverize the prepared granules, dry, sieve ...

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Abstract

The invention provides a PA66 / PA6 (Polyamide 66 / Polyamide 6) copolymerized material for selective laser sintering. The PA66 / PA6 copolymerized material is prepared from hexamethylene diammonium adipate and caprolactam at the mass ratio of (9 to 5) to (1 to 5) through condensation polymerization; the material can be mixed with a flowing auxiliary agent and / or an antioxidant according to needs, so as to improve the flowability and the anti-oxidization performance. The invention further provides a preparation method of the PA66 / PA6 copolymerized material for the selective laser sintering; the preparation method comprises the following steps: adding the hexamethylene diammonium adipate and the caprolactam into the reaction kettle at the mass ratio of (9 to 5) to (1 to 5); meanwhile, adding a molecular weight regulator, the antioxidant and water and adding an antistatic agent according to the needs; carrying out polymerization reaction under a certain condition; deeply cooling and crushing obtained copolymerized particles; sieving a powder material with the average grain diameter of 45mu m to 80mu m, so as to obtain the PA66 / PA6 copolymerized material for the selective laser sintering. The preparation method has a simple process and relatively low cost; the melting point of a copolymerized material is easy to adjust and control and the PA66 / PA6 copolymerized material is suitable for industrial production.

Description

technical field [0001] The invention relates to a copolymerized material and a preparation method thereof, in particular to a PA66 / PA6 copolymerized polyamide powder for selective laser sintering and a preparation method thereof. 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. This method is mainly accomplished using thermoplastic polymers, and patents US6136948 and WO9606881 describe in detail the method of using powdered polymers to manufacture three-dimensional objects. The technology has applications in aerospace, medical, footwear, industrial design and architecture, among other fields. [0003] One of the problems in using this technology at present is that the cost o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/36
CPCC08G69/36
Inventor 文杰斌陈礼黄敏李中元
Owner HUNAN FARSOON HIGH TECH CO LTD