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Nylon polymer powder material and preparation method thereof

A powder material and polymer technology, applied in the field of additive manufacturing, can solve the problems of poor surface quality and surface of sintered surface, inability to print fine structure, poor stability of sintering effect, etc., to improve toughness, mechanical strength and modulus. , Good impact resistance

Active Publication Date: 2022-01-14
HUNAN FARSOON HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the problem of uniform mixing of thermal medium and high molecular polymer cannot be solved, the surface quality and surface of the sintered surface will be poor, and fine structures cannot be printed.
At the same time, due to the uneven mixing of the heat medium, the stability of the sintering effect is poor

Method used

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  • Nylon polymer powder material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Add 100 parts of PA1212 salt and deionized water to the polymerization kettle, seal the reaction kettle, vacuumize it, then pass in an inert gas, raise the temperature to 200°C, the pressure in the reaction kettle reaches 1.2MPa, keep the pressure for 1h, and then slowly Deflate to normal pressure, heat up to 250°C, add 5 parts of carbon black with an average particle size of 400nm, control the melt index of nylon to 5g / 10min, start stirring at a stirring rate of 200r / min, keep the reaction for 3h, stop heating, And drawing and cutting.

[0027] (2) The crushing temperature in the crushing chamber is controlled between -70°C, the rotor clearance is adjusted to 4mm, the main engine speed is 4000r / min, the feeding rate is controlled at 1kg / (kW h), and the obtained nylon powder has a particle size of 70 μm. Nylon 1212 carbon black powder endothermic material is obtained, and the prepared nylon 1212 polymer powder endothermic material is suitable for fiber laser sinteri...

Embodiment 2

[0029] (1) Add 100 parts of PA610 salt and deionized water to the polymerization kettle, seal the reaction kettle, evacuate it, then pass in an inert gas, raise the temperature to 220°C, the pressure in the reaction kettle reaches 1.3MPa, keep the pressure for 1.5h, and then Slowly deflate to normal pressure, heat up to 265°C, add 10 parts of carbon black with an average particle size of 200nm, control the melt index of nylon to 7g / 10min, start stirring at a stirring rate of 100r / min, keep the reaction for 1.5h, stop Heat, and brush and cut.

[0030] (2) The crushing temperature in the crushing chamber is controlled between -100°C, the rotor gap is adjusted to 2.5mm, the main engine speed is 4500r / min, the feeding rate is controlled at 4kg / (kW h), and the particle size of the obtained nylon powder is 60μm. Nylon 610 carbon black powder endothermic material is prepared, and the prepared nylon 610 polymer powder endothermic material is suitable for fiber laser sintering.

Embodiment 3

[0032] (1) Add 100 parts of caprolactam and deionized water into the polymerization kettle, seal the reaction kettle, evacuate it, then pass in an inert gas, raise the temperature to 220°C, the pressure in the reaction kettle reaches 1.4MPa, keep the pressure for 2 hours, and then slowly release Gas to normal pressure, heat up to 280°C, add 8 parts of graphene with an average particle size of 300nm, control the melt index of nylon to 12g / 10min, start stirring at a stirring rate of 150r / min, keep the reaction for 2.5h, stop heating, And drawing and cutting.

[0033] (2) The crushing temperature in the crushing chamber is controlled between -100°C, the rotor clearance is adjusted to 3.5mm, the main engine speed is 5000r / min, the feeding rate is controlled at 8kg / (kW h), and the particle size of the obtained nylon powder is 65μm, The nylon 6 graphene powder endothermic material is prepared, and the prepared nylon 6 polymer powder endothermic material is suitable for fiber laser s...

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Abstract

The invention provides a preparation method of a nylon polymer powder material, which comprises the following steps: adding 100 parts of nylon raw materials and deionized water into a polymerization kettle, and after the temperature and pressure increase stage and the pressure and heat preservation stage in the polymerization reaction, put the Gas to normal pressure and heat up, add 5 to 15 parts of heat medium, control the melt index of nylon, and carry out the stirring reaction process, and then draw and cut into pellets to obtain nylon heat medium pellets; The process of cold crushing produces nylon heat medium powder material. The invention is beneficial to the dispersion of heat medium in nylon by adding heat medium at the end of polymerization, greatly improves the sintering window of nylon powder, improves the toughness, mechanical strength and mechanical modulus of nylon parts, and is more suitable for fiber laser sintering .

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a nylon polymer powder material and a preparation method thereof. Background technique [0002] The selective sintering of multiple powder layers by laser sintering is a method of manufacturing three-dimensional objects that allows three-dimensional entity. This method is primarily accomplished using thermoplastic polymers. Patents US6136948 and WO9606881 describe this method of manufacturing three-dimensional objects using powdered polymers in detail. [0003] The existing mainstream selective laser sintering mainly uses CO 2 The laser has a wavelength of 10600nm, which corresponds to the mid-infrared region. Nylon powder materials have a high absorption rate for this range of wavelengths. However, when nylon powder materials are used in fiber laser sintering, the absorption rate for this range of wavelengths is extremely low, resulting in existing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/06C08L77/02C08K3/04B29B9/06B29B13/10
CPCC08K3/04C08K3/042B29B9/06B29B13/10C08K2201/003C08L77/06C08L77/02
Inventor 文杰斌徐文雅侯帅袁博赖端
Owner HUNAN FARSOON HIGH TECH CO LTD
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