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Polyethylene terephthalate composite material for 3D printing and preparation method thereof

A polyethylene terephthalate, 3D printing technology, applied in the field of composite materials, can solve the problems of inconvenient material grafting or modification, limitation, easy to block nozzles, etc. The effect of low and simple preparation process

Inactive Publication Date: 2014-12-10
TAICANG BIQI NEW MATERIAL RES & DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, 3D printing consumables with PET as the main body are still rare, mainly because the melting temperature of PET is above 200°C, and the nozzle is easy to be blocked during fusion deposition molding
On the other hand, there are fewer free radicals on the surface of PET, which is not convenient for material grafting or modification
3D printing technology cannot be promoted and applied on a large scale at present, mainly limited to 3D printing materials
At present, the types of materials used for 3D printing are still relatively small, which cannot meet the requirements of differentiated industrial applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Crush 40g of polyethylene terephthalate resin with a weight average molecular weight of 20000-30000 into 100-120 mesh particles; under nitrogen atmosphere, dissolve 20g of polyethylene glycol 4000 in 30g of isopropanol, add 1g Bromide benzyltriethylamine, place at room temperature for 30 minutes, then add 4g of terephthalic anhydride, 5g of ethyl α-cyanoacrylate in turn, stir at room temperature for 60 minutes, then add 40g of polyethylene terephthalate particles, Heat to 70°C, stir for 60 minutes, and cool to room temperature to obtain a polyethylene terephthalate composite material for 3D printing.

[0024] The material is 3D printed at 40°C, and the density of the material after molding is 1.38g / cm 3 , the tensile strength is 79MPa, the flexural modulus is 300MPa, and the shrinkage rate is 1.13%.

Embodiment 2

[0026] Crush 50g of polyethylene terephthalate resin with a weight-average molecular weight of 20000-30000 into 100-120 mesh particles; under nitrogen atmosphere, dissolve 5g of polyethylene glycol 4000 in 15g of isopropanol, add 5g Benzyltriethylamine bromide was placed at room temperature for 60 minutes, then 5g of terephthalic anhydride and 20g of ethyl α-cyanoacrylate were added successively, stirred at room temperature for 90 minutes, and then 50g of polyethylene terephthalate particles were added, Heat to 80°C, stir for 90 minutes, and cool to room temperature to obtain a polyethylene terephthalate composite material for 3D printing.

[0027] The material is 3D printed at 60°C, and the density of the material after molding is 1.41g / cm 3 , the tensile strength is 86MPa, the flexural modulus is 336MPa, and the shrinkage rate is 0.83%.

Embodiment 3

[0029] Crush 45g of polyethylene terephthalate resin with a weight average molecular weight of 20000-30000 into 100-120 mesh particles; under nitrogen atmosphere, dissolve 7g of polyethylene glycol 4000 in 20g of isopropanol, add 2g Bromide benzyltriethylamine, place at room temperature for 45 minutes, then add 1g of terephthalic anhydride, 25g of ethyl α-cyanoacrylate in turn, stir at room temperature for 75 minutes, then add 45g of polyethylene terephthalate particles, Heat to 75°C, stir for 75 minutes, and cool to room temperature to obtain a polyethylene terephthalate composite material for 3D printing.

[0030] The material is 3D printed at 50°C, and the density of the material after molding is 1.37g / cm 3 , the tensile strength is 76MPa, the flexural modulus is 324MPa, and the shrinkage rate is 0.99%.

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Abstract

The invention provides a polyethylene terephthalate composite material for 3D printing and a preparation method thereof. The preparation method of the composite material comprises the following steps of: dissolving polyethylene glycol into isopropanol; adding benzyl triethylamine bromide, and standing at room temperature; then sequentially adding benzoic anhydride and ethyl alpha-cyanoacrylate, and stirring at room temperature; then adding polyethylene terephthalate granules, heating, stirring, and cooling to room temperature to obtain the polyethylene terephthalate composite material for 3D printing, wherein the content of polyethylene terephthalate is 40%-50%, the content of ethyl alpha-cyanoacrylate is 5%-25%, the content of polyethylene glycol 4000 is 5%-20%, the content of isopropanol is 15%-30%, the content of benzyl triethylamine bromide is 1%-5%, and the content of benzoic anhydride is 1%-5%. The polyethylene terephthalate composite material prepared through the method provided by the invention can be used for 3D printing within a temperature range of 40-60 DEG C without plugging a spray head of a 3D printer.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a polyethylene terephthalate composite material for 3D printing and a preparation method thereof. Background technique [0002] 3D printing is a kind of rapid prototyping technology. It is a technology based on digital model files and using bondable materials such as powdered metal or plastic to construct objects by layer-by-layer printing. 3D printing is usually achieved using digital technology material printers. It is often used to make models in the fields of mold manufacturing and industrial design, and is gradually used in the direct manufacture of some products. There are already parts printed using this technology. The technology has applications in jewelry, footwear, industrial design, architecture, engineering and construction (AEC), automotive, aerospace, dental and medical industries, education, geographic information systems, civil engineering, firearms, ...

Claims

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Application Information

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IPC IPC(8): C08F291/08C08F220/34C08K5/17C08K5/1539
Inventor 蓝碧健
Owner TAICANG BIQI NEW MATERIAL RES & DEV
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