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A kind of flame-retardant degradable composite material for 3D printing and preparation method thereof

A composite material and 3D printing technology, applied in the field of flame-retardant degradable composite materials and their preparation, can solve problems such as not involving flame-retardant enhanced degradable composite materials, and achieve low cost, high printing accuracy, and excellent flame retardant properties. performance effect

Active Publication Date: 2019-01-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above technologies can significantly improve the processing technology and use of polymer materials, but currently there is no flame-retardant reinforced degradable composite material suitable for 3D printing, so it is urgent to develop and industrialize

Method used

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  • A kind of flame-retardant degradable composite material for 3D printing and preparation method thereof

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preparation example Construction

[0038] The invention provides a method for preparing a flame-retardant degradable composite material for 3D printing, including the following steps:

[0039] Pretreatment of reinforcing fiber: firstly, the surface modifier is formulated into a surfactant solution with a mass fraction of 0.2% to 10% through a solvent, and the reinforcing fiber is vacuum-dried at 30°C to 105°C for 1 to 48 hours to obtain absolute dryness Reinforcing fiber; secondly, pour the bone-dry reinforcing fiber into the surfactant solution to prepare a suspension with a mass concentration of 0.1%-10%, stir the suspension for 1 min-60 min, then cool it, and use it Ionized water wash 2-6 times, suction filtration; again, the solid obtained by suction filtration is vacuum-dried at 30℃~105℃ for 1~48 h. The contact angle test proves that the surface of the reinforcing fiber in the suspension has changed from hydrophilic to Hydrophobicity is the reinforced fiber after pretreatment;

[0040] The above-mentioned solv...

Embodiment 1

[0046] The surface hydrophobic treatment of magnesium sulfate whiskers by sodium stearate:

[0047] Firstly, sodium stearate is prepared into a 3% sodium stearate solution with 70% ethanol and 30% water ethanol solution; magnesium sulfate whiskers are vacuum dried at 30℃ for 48 h to obtain absolutely dry magnesium sulfate crystals Must

[0048] Secondly, pour the above-mentioned absolute dry magnesium sulfate whiskers into the sodium stearate solution to prepare a suspension with a mass fraction of 3%; at 90℃, stir the suspension at 50 rpm for 60 minutes and then cool it. , Then wash 6 times with deionized water and filter with suction;

[0049] Once again, the solid obtained by suction filtration was vacuum dried at 30°C for 48 hours. The contact angle test proved that the surface of the magnesium sulfate whiskers in the suspension changed from hydrophilic to hydrophobic to obtain pretreated magnesium sulfate crystals. Must.

[0050] Preparation of intumescent flame retardant syste...

Embodiment 2

[0055] Hydrophobic pretreatment of magnesium sulfate whiskers by sodium stearate:

[0056] Firstly, sodium epistearate was prepared into a 0.2% sodium stearate alcohol solution by methanol, and magnesium sulfate whiskers were vacuum dried at 40°C for 40 h to obtain absolutely dry magnesium sulfate whiskers; The magnesium sulfate whiskers are poured into the sodium stearate alcohol solution to prepare a suspension with a mass concentration of 0.1%, and the magnesium sulfate whisker suspension is stirred at 100 rpm at 80°C for 50 min. Cool, wash 5 times with deionized water, and filter with suction;

[0057] Thirdly, the solid obtained by suction filtration was vacuum dried at 42°C for 41 h, and the contact angle test proved that the surface of the magnesium acid whisker in the suspension changed from hydrophilic to hydrophobic to obtain the pretreated magnesium acid whisker;

[0058] Preparation of intumescent flame retardant system:

[0059] The ammonium polyphosphate and melamine we...

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Abstract

The invention discloses an inflaming retarding type degradable composite material for hot melting type 3D (Three-Dimensional) printing and a preparation method thereof. Set raw materials are added into a high-speed mixer according to a formula ratio to be mixed; the raw materials comprise the following components in percentages by mass: 40 to 95 percent of degradable matrix material, 2 to 40 percent of expanding inflaming-retarding system and 1 to 40 percent of modified reinforcing fiber; a mixture is added into a screw extruder and is drawn to be a filament strip, the diameter of which is 1.75mm or 3mm, for later use after being subjected to fusion and mixing. The composite material has the characteristics of good degradation performance, high inflaming retarding performance, high toughness and high strength, and is applicable to the fused-deposition quick modeling of 3D printing.

Description

Technical field [0001] The invention belongs to the technical field of flame-retardant degradable composite materials and preparation methods thereof, and further relates to a flame-retardant degradable composite material used for 3D printing and a preparation method thereof. Background technique [0002] 3D printing technology is based on a computer-based three-dimensional design model, using metal powder and polymer materials to build up by layer-by-layer printing. At present, the more mature 3D printing technologies mainly include: three-dimensional light curing, laser sintering, and fusion layering (FDM). The main principle of FDM is to heat the thermoplastic material at a temperature slightly higher than the melting point of the printing material to make it melt and extrude it from the nozzle. Through computer control, it is stacked layer by layer into a finished product. [0003] The increasing shortage of petroleum resources and the pressure of environmental protection have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08K13/06C08K9/04C08K7/08C08K3/32C08K5/3492C08K5/21C08K5/521C08K5/315
CPCC08K3/32C08K5/21C08K5/3155C08K5/3492C08K5/521C08K7/08C08K9/04C08K13/06C08K2003/323C08L67/02C08L2201/02C08L2201/06C08L67/04
Inventor 岳小鹏杜鑫梁巧萍
Owner SHAANXI UNIV OF SCI & TECH
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