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Modified nylon powder as well as preparation method and application thereof

A technology of modified nylon and powder, which is applied in the field of 3D printing, can solve the problems of insufficient, three-dimensional component defects, poor toughness, etc., and achieve the effect of broadening application prospects and reducing void ratio

Active Publication Date: 2021-07-13
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the toughness of nylon powder products prepared by selective laser sintering is generally poor, far less than that of injection molded products.
The reason is attributed to the large void ratio of nylon powder, which leads to poor melting and plasticizing effect during laser sintering, and its three-dimensional parts have internal defects, and the mechanical properties cannot meet the application requirements.
[0004] However, there are inevitably intermolecular gaps in micron-sized nylon powders. In view of the above technical problems, there is an urgent need for a technical solution to effectively reduce the gaps between nylon powders

Method used

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  • Modified nylon powder as well as preparation method and application thereof
  • Modified nylon powder as well as preparation method and application thereof
  • Modified nylon powder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Add 6kg of core-shell particles CSR-1 and 18kg of deionized water into the autoclave, raise the temperature to 150°C, stir at constant temperature for 10 hours, and separate the solid and liquid by high-pressure flash evaporation. After drying, surface carboxylated core-shell particles are obtained;

[0058] (2) Add 3kg of surface carboxylated core-shell particles to 30kg of hexamethylenediamine ethanol solution with a concentration of 10wt%, raise the temperature to 150°C, and perform the amination reaction for 4h, then cool down to 70°C, and centrifuge, After drying, surface-functionalized core-shell particles were obtained with an amine grafting rate of 4%;

[0059] (3) Weigh 1.5 kg of surface-functionalized core-shell particles and mix them with 0.17 kg of compound antioxidant (the mass ratio of 1098 and 168 is 1:2), add them to 3.7 kg of ethanol, and obtain surface functionalized particles after ultrasonic dispersion for 5 hours. liquefied core-shell particle ...

Embodiment 2

[0063] (1) Add 6kg of core-shell particles CSR-2 and 18kg of deionized water into the autoclave, raise the temperature to 200°C, stir at constant temperature for 4 hours, and separate the solid and liquid by high-pressure flash evaporation. After drying, surface carboxylated core-shell particles are obtained;

[0064] (2) Add 1.5 kg of surface carboxylated core-shell particles to 6 kg of an ethanol solution of pentamethylenediamine with a concentration of 18 wt%, raise the temperature to 185°C, perform the amination reaction for 2 hours, then cool down to 70°C, and centrifuge , drying to obtain surface-functionalized core-shell particles, the grafting rate of amine groups is 10%;

[0065] (3) Weigh 1.5 kg of surface-functionalized core-shell particles and mix them with 0.17 kg of compound antioxidant (the mass ratio of 1098 and 168 is 1:2), add them to 2.8 kg of ethanol, and obtain surface functionalized particles after ultrasonic dispersion for 5 hours. liquefied core-shell ...

Embodiment 3

[0069] (1) Add 6kg of core-shell particles CSR-1 and 18kg of deionized water into the autoclave, raise the temperature to 250°C, stir at constant temperature for 4 hours, and separate the solid and liquid by high-pressure flash evaporation. After drying, surface carboxylated core-shell particles are obtained;

[0070] (2) Add 4kg of surface carboxylated core-shell particles to 10kg of ethanol solution of p-xylylenediamine with a concentration of 25wt%, raise the temperature to 220°C, perform the amination reaction for 2h, cool down to 70°C, pass centrifugation and drying to obtain surface-functionalized core-shell particles with an amine group grafting rate of 15%;

[0071] (3) Weigh 2.87kg of surface-functionalized core-shell particles and mix them with 0.05kg of compound antioxidant (the mass ratio of 1098 and 168 is 1:2), add them to 6.5kg of ethanol, and obtain surface functionalized particles after ultrasonic dispersion for 5 hours liquefied core-shell particle dispersio...

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Abstract

The invention provides modified nylon powder and a preparation method and application thereof.The modified nylon powder is mainly prepared from 50 wt%-95 wt% of nylon resin, 2 wt%-45 wt% of surface-functionalized core-shell particles and 0.1 wt%-5 wt% of antioxidants, and the average particle size of the nylon resin is 35-95 micrometers. The surface-functionalized core-shell particles are obtained by carrying out hydrolysis reaction and amination reaction on core-shell particles, and the surface-functionalized core-shell particles are selected from core-shell particles with the amino grafting rate of 1-25%; and the particle size of the core-shell particle is 100-200nm, and the core-shell particle comprises an inner core and an outer shell. The nano core-shell particles are introduced into the nylon resin, so that the void ratio of the nylon resin is remarkably reduced.

Description

technical field [0001] The invention relates to a modified nylon powder and its preparation method and application, belonging to the technical field of 3D printing. Background technique [0002] Selective laser sintering technology is a widely used 3D printing technology. Its principle is as follows: firstly, under computer control, the powder material is selectively sintered according to the given component interface profile information through the laser beam. Melting and plasticizing under high-intensity laser irradiation, when a layer of interface is sintered, a new layer of powder material is laid; secondly, the interface is selectively sintered and fused with the formed part below, and then continuously circulated, layer by layer Stacking builds up to form a three-dimensional part of the intended design. [0003] As a crystalline polymer, nylon material has low melt viscosity and wide processing window, which is very suitable for the preparation of various three-dimens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L77/06C08L33/12C08L47/00C08L83/04C08K5/20C08K5/526C08F8/32C08F8/12C08F20/14B33Y70/10B33Y80/00
CPCC08L77/02C08L77/06C08F8/32B33Y70/00B33Y80/00C08L2207/53C08L33/12C08L47/00C08K5/20C08K5/526C08L83/04C08F8/12C08F20/14
Inventor 刘万弼刘彪高斌曲振苑先佩潘现路杨伟翔
Owner WANHUA CHEM GRP CO LTD
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