Copolyester suitable for serving as 3D printing material and preparation method thereof

Abstract

The invention discloses copolyester suitable for serving as a 3D printing material and a preparation method thereof.The preparation method includes: reasonably selecting raw materials, reasonably designing a proportion, and adopting an esterification polymerization method to obtain the copolyester suitable for serving as the 3D printing material, high in thermostability and excellent in mechanical performance.Tensile strength of a copolyester material prepared by the method is greater than 45 MPa, notch impact strength is greater than 5.0 KJ/m2, elastic modulus is greater than 700 MPa, requirements, on performance of the raw materials, of 3D printing technology are met effectively, and the copolyester can be used for 3D making of functional mechanical parts; no gas is released in the printing process, so that requirements, on environment-friendly performance of the raw materials, of the 3D printing technology are met; the copolyester material is prepared through a direct copolymerization method, so that the preparation method is simple, cost is lowered, and the problem of compatibility caused by blending can be avoided effectively.

Description

Technical field [0001] The invention relates to a copolyester and a preparation method thereof, in particular to a copolyester suitable as a 3D printing material and a preparation method thereof. Background technique [0002] 3D printing technology is an emerging manufacturing technology that uses additive manufacturing. Its emergence has subverted the long-standing model of subtractive manufacturing technology used in traditional manufacturing. Because it can directly print parts of any complex shape through computer graphics data, it can effectively simplify product manufacturing procedures, shorten product development cycles, improve efficiency and reduce costs, and can be used to verify product appearance, part assembly relationships, and perform functional tests , Is receiving more and more widespread attention. [0003] Melt extrusion accumulation molding (FDM) is a commonly used technology in 3D printing technology. At present, 95% of the polymer materials commonly used in ...

AI Technical Summary

Problems solved by technology

However, due to some defects of copolyester, its application in the field of 3D printing is limited.

[0005] Although the patent CN103980674A provides a method for controlling the polyester oligomer melt and the flow rate of inorganic substances in the jet mixing process, the inorganic / polyester composite material with high inorganic content is prepared, but the compatibility between the two is not good. Well, the inorganics are unevenly dispersed

Patent CN103980672A discloses a method of using aromatic polycarbonate and aromatic polyester to carry out blending modification to improve its impact resistance, and then irradiating it with electron beams to make it cross-linked to a certain extent, but the method is complicated and costly. higher

Patent CN103980674A discloses a polyester composite material containing inorganic substances, but the compatibility of the two is not good, and the viscosity of the polymer melt is high

Patent CN1170418A discloses a biodegradable copolyester, which is esterified and prepolymerized with aliphatic dibasic acid and aliphatic dibasic alcohol, and then mixed with ester derivatives of aromatic dibasic acid, fatty The family diols are mixed for transesterification, and polycondensation is completed to obtain copolyester, but the tensile strength of the obtained polyester is relatively low at about 27MPa, and the heat resistance is poor. The heat distortion temperature is about 70°C, which is also relatively low.

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