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Modified low density polyethylene nanocomposite material used for 3D printing, and preparation method thereof

A technology of low-density polyethylene and composite materials, which is applied in the field of modified low-density polyethylene nano-composite materials and its preparation, which can solve the problems of low heat resistance, difficult handling, and low crystallization melting point, and achieve increased impact resistance , Easy to industrialized production, simple production process

Active Publication Date: 2015-07-08
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although low-density polyethylene (LDPE) has excellent properties such as good elongation, electrical insulation, chemical stability, processability and low temperature resistance (can withstand -70°C), it also has many shortcomings: mechanical strength, insulation Wetness, gas barrier and solvent resistance are poor, the molecular structure is not regular, the crystallinity (55-65%) is low, and the crystalline melting point (108-126°C) is also low
The disadvantage is that the FDM of the nanofiber composite wire is very complicated and difficult to handle
Therefore, the purpose of the present invention is to propose a method for improving the thermodynamic properties of low-density polyethylene in view of the shortcomings of current low-density polyethylene LDPE, such as low heat resistance, low hardness, and easy yield deformation.

Method used

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  • Modified low density polyethylene nanocomposite material used for 3D printing, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 1) Dissolving 5 parts of titanate coupling agent in an appropriate amount of absolute ethanol to prepare a coupling agent solution with a concentration of 1-2%.

[0055] 2) Drop the prepared coupling agent solution into 10 parts of carbon nanotube inorganic filler, stir for 24 hours in a planetary ball mill with a rotating speed of 200 r / min, take it out and bake in an oven at 80° C. for 12 hours.

[0056] 3) The carbon nanotube inorganic filler prepared in step 2), 80 parts of low-density polyethylene, 5 parts of toughening agent polyacrylate, and 2 parts of antioxidant 1010 were added to a high-speed mixer and mixed uniformly .

[0057] 4) Add the mixture obtained in step 3) into a twin-screw extruder with an aspect ratio of 36 to extrude and granulate to make LDPE pellets. The residence time of the material in the extruder was 3 minutes. The temperature of the extruder is sequentially set as follows: feeding section 150°C, melting section 160°C, homogenizing sectio...

Embodiment 2

[0062] 1) Dissolving 5 parts of titanate coupling agent in an appropriate amount of absolute ethanol to prepare a coupling agent solution with a concentration of 1-2%.

[0063] 2) Drop the prepared coupling agent solution into 10 parts of nano-SiO 2 In the inorganic filler, stir in a planetary ball mill with a rotation speed of 200r / min for 24h, take it out and bake in an oven at 80°C for 12h.

[0064] 3) the nano-SiO that will be made in step 2) 2 Inorganic filler, 80 parts of low-density polyethylene, 5 parts of toughening agent polyacrylate, and 1 part of antioxidant 1096 were added to a high-speed mixer and mixed evenly.

[0065] 4) Add the mixture obtained in step 3) into a twin-screw extruder with an aspect ratio of 36 to extrude and granulate to make LDPE pellets. The residence time of the material in the extruder was 3 minutes. The temperature of the extruder is set in turn: 155°C in the feeding section, 165°C in the melting section, 175°C in the homogenizing sectio...

Embodiment 3

[0070] 1) Dissolving 5 parts of silane coupling agent in an appropriate amount of absolute ethanol to prepare a coupling agent solution with a concentration of 1-2%.

[0071] 2) Drop the prepared coupling agent solution into 10 parts of nano-TiO 2 In the inorganic filler, stir in a planetary ball mill with a rotation speed of 200r / min for 24h, take it out and bake in an oven at 80°C for 12h.

[0072] 3) the nano-TiO that will be made in step 2) 2 Inorganic filler, 85 parts of low-density polyethylene, 5 parts of toughening agent polyester, and 5 parts of antioxidant 168 were added to a high-speed mixer and mixed evenly.

[0073] 4) Add the mixture obtained in step 3) into a twin-screw extruder with an aspect ratio of 36 to extrude and granulate to make low-density polyethylene nanocomposite pellets. The residence time of the material in the extruder was 5 minutes. The temperature of the extruder is set in turn: 150°C in the feeding section, 165°C in the melting section, 170...

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Abstract

A modified low density polyethylene material used for 3D printing comprises, by weight, 80-95 parts of low density polyethylene, 1-10 parts of an inorganic nanoparticle filler, 1-5 parts of a coupling agent, 5-10 parts of a flexibilizer, and 1-5 parts of an antioxidant. The modified low density polyethylene material has the advantages of very good fusion viscosity, very good fluidity, very good heat resistance and very good wear resistance, accords with the characteristics a 3D printing material, and has a wide application prospect in the 3D printing technology.

Description

technical field [0001] The invention relates to a modified low-density polyethylene nano-composite material and a preparation method thereof, in particular to a modified low-density polyethylene nano-composite material for 3D printing and a preparation method thereof. Background technique [0002] Low-density polyethylene (LDPE) is milky white bead-shaped particles, non-toxic, tasteless, odorless, matte surface, density 0.916-0.930g / cm 3 . It is a synthetic resin obtained by ethylene radical polymerization under high pressure, so it is also called "high pressure polyethylene". Because the molecular chain contains more long and short chain branches, the product has low density, softness, low temperature resistance and impact resistance; it has good chemical stability. In addition to strong oxidative acid resistance, it is generally acid and alkali resistant. , salt corrosion, excellent electrical insulation performance, low water vapor transmission rate, good fluidity, good...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08K13/06C08K9/04C08K9/06C08K7/00C08K3/04C08K3/36C08K3/22C08K3/34B29B9/06
CPCB29B9/06B29C48/92B29C2948/92704B29C2948/92857B29K2105/0094C08K2201/003C08K2201/011C08L23/06C08L2201/08C08L2207/066C08L33/08C08K9/04C08K7/24C08K5/1345C08K3/36C08K5/20C08K5/524C08L67/00C08K9/06C08K2003/2241C08K5/526C08K3/34
Inventor 岳二林张文娟杨文泓杜世振孙文华马永梅赵宁董金勇李春成符文鑫林学春
Owner INST OF CHEM CHINESE ACAD OF SCI
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