Polyester for 3D printing, and preparation method thereof

A 3D printing and polyester technology, which is applied in the field of 3D printing polyester and its preparation, can solve problems such as inability to achieve copolymerization, and achieve the effects of small melt index, large number average molecular weight, and improved toughness

Inactive Publication Date: 2018-04-20
SINOPEC YIZHENG CHEM FIBER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chain extender must be added to the screw, and direct copolymerization cannot be achieved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: Preparation of polybasic acid branched aromatic and aliphatic copolyesters

[0024] Add terephthalic acid, dimethyl succinate, and 1,4-butanediol to a 2L stainless steel polymerization reactor at a molar ratio of 0.6:0.4:1.8 at room temperature, and then add 0.5% magnesium silicate, 0.15 % trimellitic anhydride, 10% talcum powder, tetrabutyl titanate, replace the air in the kettle with nitrogen, then stir and raise the temperature under normal pressure, control the temperature of the reaction kettle to carry out esterification at 200°C, and test the ester every 10 minutes The refractive index of the esterified water sample is greater than 1.390; the temperature is raised to 235°C, and the pressure is slowly lowered to 50Pa, and polycondensed for 3 hours to obtain a copolyester. Its number average molecular weight is 4.0×104, its elongation at break is 220%, and its melt index is 8.1g / 10min.

Embodiment 2

[0025] Embodiment 2: Preparation of polybasic acid branched aromatic and aliphatic copolyesters

[0026] Add terephthalic acid, adipic acid, and 1,4-butanediol into a 2L stainless steel polymerization reactor at a molar ratio of 0.6:0.4:1.8 at room temperature, and then add 0.5% magnesium silicate and 0.15% partial phenylene Triformic anhydride, 10% talc, tetraisopropyl titanate. Test process is the same as embodiment 1), and its number average molecular weight is 5.9 * 104, elongation at break 260%, melt index: 6.2g / 10min

Embodiment 3

[0027] Embodiment 3: Preparation of polyol branched aromatic and aliphatic copolyesters

[0028] Add terephthalic acid, dimethyl succinate, and 1,4-butanediol to a 2L stainless steel polymerization reactor at a molar ratio of 0.6:0.4:1.8 at room temperature, and then add 0.5% magnesium silicate, 0.15 %glycerol, 10% titanium dioxide, titanium ethylene glycol, and nitrogen to replace the air in the kettle, then stir and raise the temperature under normal pressure, control the temperature of the reaction kettle to carry out esterification at 200°C, and test the esterification water sample every 10 minutes Refractive index, when the refractive index of esterified water is greater than 1.390; the temperature is raised to 235°C, and the pressure is slowly lowered to 50Pa, polycondensed for 3 hours to obtain copolyester. Its number-average molecular weight is 7.4×104, its elongation at break is 290%, and its melt index is 3.0 g / 10 min.

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Abstract

The invention discloses a polyester for 3D printing, and a preparation method thereof. According to the present invention, an aromatic dibasic acid or a dimethyl ester thereof, an aliphatic dibasic acid or a dimethyl ester thereof, and diol are used as monomers and are subjected to a normal pressure esterification reaction in the presence of a nucleation agent, a branching agent, a filler and a catalyst, heating pressure reducing is performed after the esterification reaction is completed, and a condensation polymerization reaction is performed to obtain the copolyester material, wherein the aromatic dibasic acid is an aromatic C6-C10 dibasic acid, the aliphatic dibasic acid is an aliphatic C2-C10 dibasic acid, the diol is a C2-C10 diol, and the branching agent is a polybasic acid or a polyol. According to the present invention, the obtained material has advantages of high elongation at break, large number average molecular weight, low melt index and degradability, and can be used as a3D printing material.

Description

technical field [0001] The invention belongs to the field of polyester production, and in particular relates to a polyester used for 3D printing and a preparation method thereof. Background technique [0002] 3D printing technology, also known as additive manufacturing technology, also known as three-dimensional printing technology, refers to the use of layered processing and superposition forming methods to increase materials layer by layer through a 3D printer that can "print" a real object to generate a 3D entity. The most prominent advantage of 3D printing technology is that it can directly generate objects of any shape from computer graphics data without machining or molds, thereby greatly shortening the product development cycle, improving productivity and reducing production costs. The technology has applications in jewelry, footwear, industrial design, architecture, engineering and construction (AEC), automotive, aerospace, dental and medical industries, education, g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/78C08K3/34C08K3/22
CPCC08G63/20C08G63/78C08K3/22C08K3/34C08K2003/2241
Inventor 夏峰伟李乃祥戴志彬潘小虎樊云婷
Owner SINOPEC YIZHENG CHEM FIBER
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