Polylactic acid modified material for 3D printing and its preparation method and application
A modified material and 3D printing technology, applied in the field of materials, can solve the problems of low printing temperature, poor toughness of polylactic acid, and easy hydrolysis, etc., and achieve high interlayer bonding strength, good hydrolysis resistance, and high smooth surface Effect
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[0058] The preparation method provided by the present application is simple, convenient to operate, and capable of large-scale production, thereby preparing a polylactic acid modified material for 3D printing with excellent performance.
[0059] The present application also provides the application of the above-mentioned polylactic acid modified material for 3D printing in 3D printing products. The obtained 3D printing product has strong toughness, good hydrolysis resistance, good stability, smooth surface and high hardness, high interlayer bonding strength, environmental protection and non-toxicity, which is beneficial to its application. In this application, the shape and size of the 3D printed product can be selected and printed according to actual needs.
Embodiment 1
[0061] 80 parts by weight of polylactic acid (type 4032D produced by NatureWorks in the United States), polyoxymethylene resin (type M90 produced by Yuntianhua) and polyurethane elastomer (type C90A produced by BASF) prepared by melt-kneading (Polyoxymethylene resin and The weight ratio of polyurethane elastomer is 60:40) 20 parts by weight, 0.05 part by weight of hindered phenolic antioxidant Irganox1010 (BASF company) and 0.05 part by weight of phosphorus antioxidant Irgafos168 (BASF company) are mixed uniformly to form a mixture. The above mixture was directly passed through a single-screw extruder at 200° C. and a revolution of 35 Hz to make a 3D printing line with a diameter of 1.75 mm, which was a polylactic acid modified material for 3D printing.
[0062] The 3D printing line has a smooth surface, uniform thickness and high surface hardness. The 3D printing lines were printed by 3D printers produced by different companies such as Flashforge and TusHoldings, and printe...
Embodiment 2
[0064] 75 parts by weight of polylactic acid (type 4032D produced by NatureWorks in the United States), a melt blend of polyoxymethylene resin (M270 produced by Polyplastics in Japan) and MBS elastomer (EXL-2620 produced by Rohm and Haas) (polyoxymethylene resin and MBS elastic The body weight ratio is 80:20) 25 parts by weight, 0.1 parts by weight of hindered phenolic antioxidant Irganox 10101 and 0.1 parts by weight of phosphorus antioxidant Irgafos 1680.1 parts by weight are uniformly mixed to form a mixture.
[0065] 3D printing lines and 3D printing products were prepared in the same way as in Example 1 and their properties were investigated. The results show that the 3D printing line has a smooth appearance, stable diameter and size, the shape of each printed product is intact, the interlayer bonding strength is high, and there is no deformation and cracking; the 3D printing line is repeatedly folded in half for more than 4 times. Twists and turns.
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