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Polyamide powder and preparation method thereof

A polyamide powder and polyamide technology, applied in the field of polyamide powder and its preparation, can solve the problems of damage to the anti-oxidation effect of materials, yellowing of powder, and poor performance of parts, and achieve easy removal, recycling and reuse, loose packing The effect of high density and high sphericity

Active Publication Date: 2016-06-22
GUANGDONG SILVER AGE SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Or add a certain amount of butanone in the process of solvent powder making, so that the powder particles have regular shape and good sphericity, but the addition of butanone will damage the anti-oxidation effect of the material and make the powder yellow. Part performance deterioration

Method used

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  • Polyamide powder and preparation method thereof
  • Polyamide powder and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of polyamide powder, comprising the following steps:

[0041] Dissolution and heat preservation: Add 1 weight part of PA12 and 10 volume parts of formamide into a reaction kettle protected by nitrogen, stir at a speed of 500r / min, heat the mixture to 40°C higher than the precipitation temperature of PA12 powder and keep it for 1 Hour, the reactor pressure is 1.0MPa.

[0042] Cool down to make powder: cool down to 125°C at a rate of 0.5°C / min, then cool down to a PA12 precipitation temperature of 100°C at a rate of 0.18°C / min, and finally cool down to room temperature at a rate of 2.8°C / min to precipitate PA12 precipitates.

[0043] Drying: The precipitated polyamide is centrifuged and dried to obtain PA12 powder particles. The obtained polyamide powder material powder particles are spherical particles with good sphericity, uniform particles and concentrated particle size. 65.3 μm, D75 is 80 μm, and D90 is 98.2 μm.

Embodiment 2

[0045] A preparation method of polyamide powder, comprising the following steps:

[0046] Dissolution and heat preservation: PA6 pellets and 1% titanium dioxide are dissolved in formamide and added to a reactor protected by nitrogen, stirred at a speed of 450r / min, and the mixture is heated to 40°C higher than the precipitation temperature of PA6 powder and kept for 0.5 hours. Reactor pressure is 1.2MPa.

[0047] Cool down to make powder: cool down at a rate of 0.5°C / min to a temperature 20°C higher than the precipitation temperature of PA6 powder, then cool down to the precipitation temperature of PA6 powder at a rate of 0.4°C / min, and finally cool down at a rate of 5°C / min to At room temperature, PA6 was precipitated out.

[0048] Drying: The precipitated polyamide is centrifuged and dried to obtain PA6 powder particles. The appearance of the obtained polyamide powder material is spherical particles with good sphericity, uniform particles and concentrated particle size. Th...

Embodiment 3

[0050] A preparation method of polyamide powder, comprising the following steps:

[0051] Dissolution and heat preservation: Dissolve PA11 pellets, 0.1% titanium dioxide, and 1% fumed silica in formamide and add them to a reaction kettle protected by nitrogen gas, stir at a speed of 500r / min, and heat the mixture until PA11 powder is precipitated The temperature was kept at 25° C. for 1.5 hours, and the pressure of the reactor was 0.8 MPa.

[0052] Cooling powder: Cool down at a rate of 2.0°C / min to a temperature 20°C higher than the precipitation temperature of PA11 powder, then cool down at a rate of 0.1°C / min to the precipitation temperature of PA11 powder, and finally cool down at a rate of 1°C / min to At room temperature, the precipitation of PA11 was obtained.

[0053] Drying: The precipitated polyamide is centrifuged and dried to obtain PA11 powder particles. The appearance of the obtained polyamide powder material shows that the powder particles are spherical particle...

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Abstract

The invention relates to the technical field of polyamide preparation, in particular to polyamide powder and a preparation method thereof. The preparation method comprises the following steps: dissolution and heat preservation, wherein polyamide is dissolved and added into a reaction kettle, heating is conducted, and the temperature is raised to be 25-80 DEG C higher than the polyamide precipitation temperature; cooling and powder making, wherein the temperature is lowered to be 14-16 DEG C higher than the polyamide powder precipitation temperature at the speed of 0.5-2.0 DEG C / min, then the temperature is lowered to the polyamide powder precipitation temperature at the speed of 0.1-0.4 DEG C / min, finally the temperature is lowered to the room temperature at the speed of 1-5 DEG C / min, precipitation is conducted, and polyamide precipitate is obtained; drying, wherein the polyamide precipitate is dried, and polyamide powder particles are obtained. The polyamide powder particles prepared through the preparation method are good in size concentration degree, simple and convenient in process and particularly applicable to SLS process requirements, and performance of products is excellent.

Description

technical field [0001] The invention relates to the technical field of polyamide preparation, in particular to a polyamide powder and a preparation method thereof. Background technique [0002] Polyamide is also commonly known as nylon, which is a general term for polymers containing amide groups in the repeating unit of the macromolecular main chain. As a large amount of engineering plastics, nylon is widely used in machinery, automobiles, electrical appliances, textile equipment, chemical equipment, aviation, metallurgy and other fields, and has become an indispensable structural material in various industries. Its main characteristics are as follows: 1. Excellent mechanical properties : Nylon has high mechanical strength and good toughness; 2. Good self-lubrication and friction resistance: Nylon has good self-lubrication and small friction coefficient, so it has a long service life as a transmission component; 3. Excellent heat resistance Properties: such as nylon 46 and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/14C08L77/02C08L77/06C08K3/22C08K3/36
CPCC08J3/14C08J2377/02C08J2377/06C08K3/22C08K3/36C08K2003/2241C08L77/02C08L2205/24C08L77/06
Inventor 刘映坚傅轶洪浩然王雁国黄志轩
Owner GUANGDONG SILVER AGE SCI & TECH CO LTD
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