A kind of polyethylene composition and application and laser sintering method and three-dimensional article
A laser sintering and polyethylene technology, which is used in manufacturing, solid material additive processing, additive processing, etc., can solve the problem of not meeting the mechanical performance test requirements of molded parts, the strength and rigidity of nylon-12 powder and polystyrene powder. Low, unable to meet the performance requirements and other problems, to achieve the effect of large tensile strain at break, smooth surface, high deformation temperature under load
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[0024] In the present invention, the particle size of the inorganic filler can vary within a wide range. According to a preferred embodiment of the present invention, the particle size of the inorganic filler is 6.5-23 μm, more preferably 6.5-18 μm. The particle size of the inorganic filler can also be in "mesh". For example, the particle size of the inorganic filler is 2.6-25 μm, and the corresponding particle size is 500-5000 mesh. The particle size of the inorganic filler is preferably 600-2000 mesh, more preferably 800-2000 mesh.
[0025] In the present invention, the particle size of the inorganic filler can be controlled by sieving. The means of sieving are well known to those skilled in the art. For example, the inorganic filler with a particle size of 500-5000 mesh can be sieved through a 500-mesh sieve first, and then sieved through a 5000-mesh sieve, and the inorganic filler left on the 5000-mesh sieve is Inorganic fillers that meet particle size requirements.
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Embodiment 1
[0049] This embodiment is used to illustrate the polyethylene composition provided by the present invention and its preparation method and application.
[0050] (1) Preparation of polyethylene composition
[0051] The ultra-high molecular weight polyethylene with a viscosity-average molecular weight of 3.5 million is air-selected to control the particle size of the ultra-high molecular weight polyethylene to 40-100 μm. The silicon dioxide is sieved to control the particle size of the silicon dioxide to be 6.5-18 μm. 9000 grams of ultra-high molecular weight polyethylene selected by wind, 1000 grams of silicon dioxide screened out, 10 grams of antioxidant 1010, and 20 grams of antioxidant 168 were mixed uniformly by a high-speed stirrer to prepare polyethylene Composition A1.
[0052] (2) Selective laser sintering
[0053] Selective laser sintering was carried out with polyethylene composition A1 as raw material. At the beginning of molding, the molding cylinder workbench i...
Embodiment 2
[0055] This embodiment is used to illustrate the polyethylene composition provided by the present invention and its preparation method and application.
[0056] (1) Preparation of polyethylene composition
[0057] The ultra-high molecular weight polyethylene with a viscosity-average molecular weight of 3 million is subjected to winnowing, and the particle size of the ultra-high molecular weight polyethylene is controlled to be 40-100 μm. The glass microspheres are sieved to control the particle size of the glass microspheres to be 6.5-18 μm. 9300 grams of ultra-high molecular weight polyethylene selected by wind, 700 grams of glass microspheres screened out, 15 grams of antioxidant 1010, and 10 grams of antioxidant 168 were mixed uniformly by a high-speed stirrer to prepare polyethylene Composition A2.
[0058] (2) Selective laser sintering
[0059] Selective laser sintering was carried out from polyethylene composition A2. At the beginning of molding, the molding cylinder...
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Abstract
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