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Method for enhancing nylon selectivity laser sintering forming element by inorganic nano particles

An inorganic nanoparticle and laser sintering technology, applied in the field of materials in advanced rapid manufacturing, can solve the problems of inability to uniformly disperse nanoparticles, inability to play a role in nanoparticle reinforcement, toughening, and nanoparticle dispersion.

Active Publication Date: 2008-03-26
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because nanoparticles are easy to agglomerate, this method of mechanical mixing obviously cannot make the nanoparticles uniformly dispersed in the nylon powder, so the nanoparticles in the SLS formed parts cannot be dispersed in the nylon matrix at the nanometer scale, and the enhancement and enhancement of the nanoparticles cannot be exerted. Toughening

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Take 1000 grams of nano-silica, stir and mix it with the alcohol-water solution of 250 grams of γ-aminopropyltriethoxysilane, dry at room temperature for 2 days, and then dry at 65°C for 2 hours , ball milling and sieving to obtain nano silicon dioxide with surface organic treatment.

[0023] The composition and mass percentage of the alcohol-water solution of γ-aminopropyltriethoxysilane are: 95% ethanol, 3% distilled water, and 2% γ-aminopropyltriethoxysilane.

[0024] (2) Add 10 grams of surface organically treated nano silicon dioxide into 5000 grams of mixed solvent, and perform ultrasonic dispersion treatment to prepare nano silicon dioxide suspension.

[0025] (3) 1000 grams of nano-silica suspension in (2), 1000 grams of nylon 12 resin, and 2 grams of composite antioxidant are dropped into a jacketed 50L stainless steel reactor, the reactor is sealed, vacuumed, and N 2 gas protection. The proportioning (mass fraction) of the mixed solvent is: 85% ethanol, ...

Embodiment 2～3

[0031] Same as Example 1, wherein the nano-silica content in the prepared nano-silica suspension is 20g, 30g respectively, and the partial mechanical properties of the SLS formed parts are shown in Table 1. The pure nylon 12 powder SLS containing no nano-silica The mechanical properties of the formed parts are also listed in Table 1 for comparison.

Embodiment 4

[0033] (1) Take 1000 grams of nano-alumina, stir and mix it with 250 grams of γ-aminopropyltriethoxysilane alcohol-water solution, dry at room temperature for 2 days, and then dry at 65 ° C for 2 hours Finally, ball milling and sieving to obtain nano-alumina with surface organic treatment.

[0034]The composition and mass percentage of the alcohol-water solution of γ-aminopropyltriethoxysilane are: 95% ethanol, 3% distilled water, and 2% γ-aminopropyltriethoxysilane.

[0035] (2) Add 30 grams of surface organically treated nano-alumina to 5000 grams of mixed solvent, and perform ultrasonic dispersion treatment to prepare a suspension of nano-alumina.

[0036] (3) 1000 grams of nano-alumina suspension in (2), 1000 grams of nylon 11 resin, and 2 grams of composite antioxidants are dropped into a jacketed 50L stainless steel reactor, the reactor is sealed, vacuumed, and N 2 gas protection. The proportioning (mass fraction) of the mixed solvent is: 85% ethanol, 1% distilled wate...

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Abstract

The present invention discloses process of preparing selectively laser sintered inorganic nanometer particle reinforced nylon part. The process includes the following steps: surface organizing treatment of inorganic nanometer particle and ultrasonic treatment to disperse the inorganic nanometer particle homogeneously in mixed solvent to form inorganic nanometer particle suspension; heating the mixture of inorganic nanometer particle suspension, nylon resin and antioxidant inside a sealed container to dissolve the nylon resin in the solvent; cooling, decompression distilling to recover solvent, vacuum drying, ball milling and sieving to obtain composite nylon / inorganic nanometer particle composite material; and final selectively laser sintering to form. The selectively laser sintered inorganic nanometer particle reinforced nylon part has raised strength and high toughness.

Description

technical field [0001] The invention belongs to the field of materials in advanced rapid manufacturing, and in particular relates to a method for inorganic nanoparticle-reinforced nylon selective laser sintering formed parts. technical background [0002] Selective laser sintering (selective laser sintering, SLS) is a rapid prototyping technology that uses laser as a heat source to sinter powder materials. SLS technology adopts the principle of discrete and accumulation forming, and with the help of computer-aided design and manufacturing, solid powder materials are directly formed into three-dimensional solid parts. SLS can form a variety of materials, including polymers, metals and ceramics. Compared with metal and ceramic materials, polymer materials have the advantages of low molding temperature, low sintering laser power, and high precision, and have become the most widely used and most successful SLS materials. [0003] Nylon is a semi-crystalline polymer with good s...

Claims

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Application Information

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IPC IPC(8): C08L77/00C08K5/541B29C67/04C08K3/36C08K5/524
Inventor 史玉升闫春泽杨劲松
Owner HUAZHONG UNIV OF SCI & TECH
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