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Polymer-based micro/nano composite material powder and preparation method thereof

A nano-composite material and polymer technology, applied in the polymer field, can solve the problems of inability to solve the problem of inorganic nano-particle dispersion, the comprehensive performance of sintered products cannot meet the expected requirements, etc., and achieves the promotion of application development, easy large-scale production, and excellent performance. Effect

Inactive Publication Date: 2017-06-13
SICHUAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Melt extrusion-cryogenic crushing is currently a relatively simple and commonly used composite material powder preparation method. The advantage of this method is that it can coat inorganic particles in the polymer matrix and realize the large-scale production of SLS processing raw materials. However, the existing problem is that a single melt extrusion cannot solve the dispersion problem of inorganic nanoparticles in the polymer, resulting in the comprehensive performance of the sintered product failing to meet the expected requirements.

Method used

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  • Polymer-based micro/nano composite material powder and preparation method thereof
  • Polymer-based micro/nano composite material powder and preparation method thereof
  • Polymer-based micro/nano composite material powder and preparation method thereof

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preparation example Construction

[0026] A method for preparing a polymer-based micro / nano novel composite material powder suitable for selective laser sintering, comprising the following steps:

[0027] A. Grinding: Grind 13-98 parts of polymer, 1-85 parts of inorganic functional particles, and 1-2 parts of antioxidant through a solid-phase force chemical reactor, and control the cooling water temperature during the grinding process 5-30°C, milling pressure 10-50MPa, milling speed 10-1000rpm, milling times 5-20 times; preferred circulating water temperature 5-20°C, milling pressure 25-50MPa, milling speed 100-500rpm, and the number of grinding times is 5-15 times.

[0028] B. Granulation: Melt and extrude the compound powder obtained by grinding in a screw extruder, optimize the extrusion temperature and speed according to the characteristics of the material itself, and then granulate;

[0029]C. Cryogenic crushing: put the extruded particles into the silo of the cryogenic crushing equipment, and use liquid ...

Embodiment 1

[0041] PA11 / BaTiO 3 Piezoelectric nanocomposite material: first, 130g of nylon 11 (PA11) with a particle size of 2 to 5mm, BaTiO 3 850g of piezoelectric nanopowder particles, with an average particle size of 500nm, and 18g of 1,3,5-trimethyl-2,4,6(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 2, Add 2 g of 2-ethylene bis(4,6-di-tert-butylphenyl) fluorophosphite into the opened disc-shaped mechanochemical reactor through the feeding port, and control the temperature of cooling circulating water at 25°C during the milling process , the grinding pressure is 25MPa, the grinding speed is 500rpm, after 10 times of grinding, PA11 / BaTiO 3 Piezoelectric nanocomposite material powder; the composite material powder obtained by grinding is melted and extruded in a twin-screw extruder, the extrusion temperature is 190-210°C, the extrusion speed is 80rpm, and then granulated to obtain a particle size of 2- 5mm composite material particles; the extruded particles are added to the cryogenic cr...

Embodiment 2

[0045] PA12 / CNTs conductive nano-composite material: First, 980g of nylon 12 (PA12) with a particle size of 2-5mm, 10g of CNTs powder particles, a length of 1.5μm, a diameter of 9.5nm and 2,6-di-tert-butyl-4-methyl- 14g of phenol and 46g of tetrakis(2,4-di-tert-butylphenyl)-46g were added to the opened disc-shaped mechanochemical reactor through the feeding port. During the grinding process, the cooling circulating water temperature was controlled at 25°C and the grinding pressure was 15MPa , the milling speed is 700rpm, and after 6 times of milling, a uniformly mixed PA12 / CNTs conductive nanocomposite powder is obtained; the composite powder obtained by milling is melted and extruded in a twin-screw extruder, and the extrusion temperature 180-200°C, extrusion speed 80rpm, and then granulated to obtain composite material particles with a particle size of 2-5mm; the extruded particles were added to the cryogenic crushing equipment to be crushed and classified and collected by th...

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Abstract

The invention belongs to the field of high molecules, and particularly relates to a polymer-based micro / nano composite material powder and a preparation method thereof. According to the scheme for solving the technical problem, the polymer-based micro / nano composite material powder is prepared by the following steps: based on mass parts, grinding 13-98 parts of polymer, 1-85 parts of inorganic functional particles and 1-2 parts of antioxidant through a solid-phase physical-chemical reactor, performing melt extrusion and freeze grinding on the compound powder obtained after grinding, and filtering through a screen of 100-800 meshes; adding flow promotor which is 0.2-0.8 percent of weight of the screened material into the screened material, uniformly mixing, and filtering through a screen of 150-200 meshes to obtain the screened material which is the polymer-based micro / nano composite material powder. The polymer-based micro / nano composite material powder is applicable to SLS technology, and the product has excellent performance.

Description

technical field [0001] The invention belongs to the field of macromolecules, and in particular relates to a polymer-based micro / nano composite material powder and a preparation method thereof. Background technique [0002] 3D printing is an advanced manufacturing technology based on materials, machinery, control, computer software, etc., which embodies the characteristics of green manufacturing, intelligent manufacturing and social manufacturing. At present, products prepared by 3D printing are widely used in high-tech fields such as major national defense equipment, aerospace, biomedicine, industrial design, communication electronics, and automobiles. Developed countries in Europe and the United States attach great importance to this, believing that this technology "will promote the realization of the third industrial revolution" and was listed as "the ten fastest-growing industries in the United States" by the American "Time Magazine". In view of this, countries have impl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L75/04C08L23/06C08L27/16C08L69/00C08L33/12C08L61/16C08L23/12C08K13/02C08K13/04C08K3/24C08K5/134C08K5/526C08K3/36C08K7/24C08K3/38C08K5/20C08K7/06B33Y70/00
CPCC08K13/02B33Y70/00C08K3/22C08K3/24C08K3/346C08K3/36C08K3/38C08K5/1345C08K5/526C08K7/06C08K7/14C08K7/24C08K13/04C08K2003/2244C08K2003/385C08K2201/003C08K2201/004C08K2201/011C08L77/02C08L75/04C08L23/06C08L27/16C08L69/00C08L33/12C08L61/16C08L23/12
Inventor 陈宁戚方伟王琪张正义王乐泉陈英红
Owner SICHUAN UNIV
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