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Polyvinyl alcohol-based composite powder for selective laser sintering and preparation method thereof

A polyvinyl alcohol-based, composite powder technology, applied in the direction of additive processing, etc., can solve the problems affecting the performance of sintered parts, affecting the performance of 3D printing products, and limited application fields, etc., to achieve good biodegradability, The effect of low manufacturing cost and mature process conditions

Active Publication Date: 2021-04-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the technical solution disclosed by this patent, polyvinyl alcohol and calcium silicate are simply mixed mechanically. Although it discloses that the maximum mass fraction of calcium carbonate can be added up to 20wt%, too much calcium silicate can easily lead to Sintering is difficult, which affects the performance of its sintered parts, so its embodiment only uses a technical solution with a calcium silicate mass fraction of 10wt%.
[0006] Generally speaking, the amount of inorganic filler added in composite materials will directly affect the performance of the final product, but the current 3D printing technology has a limited amount of inorganic filler added, which will greatly affect the performance of its 3D printed products, making its application fields restricted

Method used

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  • Polyvinyl alcohol-based composite powder for selective laser sintering and preparation method thereof
  • Polyvinyl alcohol-based composite powder for selective laser sintering and preparation method thereof
  • Polyvinyl alcohol-based composite powder for selective laser sintering and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation method of polyvinyl alcohol / hydroxyapatite composite powder for selective laser sintering, in parts by weight, comprises the following steps:

[0044] (1) Add 100 parts of polyvinyl alcohol resin, 30 parts of glycerin, and 3 parts of magnesium nitrate into a high-speed mixer at room temperature (20-30°C), mix at 100r / min for 30 minutes, then put it in a sealed box and seal it , and then place the sealed box in an oven at 80°C for 12 hours to make it fully plasticized, then add 30 parts of hydroxyapatite and then fully stir to make it evenly mixed;

[0045] (2) Melt and blend the mixture obtained in step (1) with a twin-screw extruder, and extrude to granulate; the extrusion processing parameters are: 80°C in the first zone, 180°C in the second zone, and 190°C in the third zone. The temperature is 179°C, and the screw speed is 35r / min;

[0046] (3) The granules obtained in step (2) are subjected to cryogenic crushing with a freeze pulverizer at a tempera...

Embodiment 2

[0051] The preparation method of polyvinyl alcohol / tricalcium phosphate (TCP) composite powder for selective laser sintering, in parts by weight, comprises the following steps:

[0052] (1) Add 100 parts of polyvinyl alcohol resin, 25 parts of glycerol, and 2 parts of starch into a high-speed mixer at room temperature (20-30°C), mix for 30 minutes at 100 r / min, put it in a sealed box, and seal it. Then place the sealed box in an oven at 80°C for 12 hours to make it fully plasticized, and then add 40 parts of tricalcium phosphate to fully stir and mix to make it evenly mixed;

[0053] (2) Melt and blend the mixture obtained in step (1) with a twin-screw extruder, and extrude to granulate; the extrusion processing parameters are: 1 zone 80°C, 2 zone 185°C, 3 zone 190°C, head The temperature is 175°C, and the screw speed is 30r / min;

[0054] (3) The granules obtained in step (2) are cryogenically crushed using a freezer pulverizer at a temperature of -100°C, and then the resulti...

Embodiment 3

[0059] The preparation method of polyvinyl alcohol / carbon nanotube composite powder for selective laser sintering, in parts by weight, comprises the following steps:

[0060] (1) At room temperature (20-30°C), add 100 parts of polyvinyl alcohol resin, 10 parts of glycerol, 10 parts of water, and 5 parts of 1-hydroxyethyl-3-methylimidazolium chloride into the high-speed mixer , mixed at 200r / min for 40min, put it into a sealed box and sealed it, then placed the sealed box in a 60°C oven for 8 hours to make it fully plasticized, and then added 1 part of carbon nanotubes for full stirring and mixing to make it mix Uniform;

[0061] (2) Melt and blend the mixture obtained in step (1) with a twin-screw extruder, and extrude to granulate; the extrusion processing parameters are: 60°C in the first zone, 170°C in the second zone, and 180°C in the third zone. The temperature is 160°C, and the screw speed is 40r / min;

[0062] (3) Cryogenically pulverize the pellets obtained in step (2...

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Abstract

The invention provides polyvinyl alcohol-based composite powder for selective laser sintering and a preparation method thereof. The composite powder comprises the following raw materials in parts by weight: 100 parts of polyvinyl alcohol resin, less than or equal to 40 parts of an inorganic filler, 10-60 parts of a plasticizing modifier and 0.1-0.5 part of a flow aid. The preparation method of thecomposite powder includes plasticizing and modifying the polyvinyl alcohol, and mixing with the inorganic filler to prepare the powder material suitable for selective laser sintering. The addition amount of the inorganic filler in the polyvinyl alcohol-based composite powder can reach 40 wt% of the addition amount of polyvinyl alcohol, the functionality of the high-addition-amount filler can be brought into full play, the sintering window is wide, the fluidity is good, and the polyvinyl alcohol-based composite powder is suitable for selective laser sintering 3D printing processing.

Description

technical field [0001] The invention belongs to the technical field of 3D printing polymer materials, and in particular relates to a polyvinyl alcohol-based composite powder for selective laser sintering and a preparation method thereof, especially suitable for the preparation of biomedical parts for 3D printing. Background technique [0002] 3D printing technology, also known as rapid prototyping technology or additive manufacturing technology, is a revolutionary manufacturing technology that subverts traditional manufacturing methods. It has attracted widespread attention worldwide and is believed to trigger a new round of industrial revolution. Selective Laser Sintering (SLS for short) is one of the mainstream technologies of 3D printing at present. Based on the discrete accumulation manufacturing principle, the three-dimensional model of the molded part is sliced ​​in layers, and the laser is used as the heat source, and the slices are cut on the powder bed. The path inf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L3/02C08L5/08C08L71/02C08K13/02C08K5/053C08K3/28C08K3/32C08K3/36C08K3/34C08K3/04C08K5/3445B33Y70/10
CPCB33Y70/00C08K3/28C08K3/32C08K3/34C08K3/36C08K5/053C08K5/3445C08K13/02C08K2003/2241C08K2003/328C08K2201/003C08K2201/011C08L29/04C08L2203/02C08L2205/03C08K3/041C08L3/02C08L5/08C08L71/02C08K3/22
Inventor 陈英红王乐泉陈宁王琪
Owner SICHUAN UNIV
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