Polylactic acid composition used for 3D printing, and preparation method thereof

A 3D printing and polylactic acid technology, applied in the field of 3D printing materials, can solve the problems of monotonous printing effect and inability to spray dyeing with water-based dyes, and achieve the effect of high mechanical strength

CN110054875AActive Publication Date: 2019-07-26SHENZHEN 7TH TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-07-26

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Abstract

The invention discloses a polylactic acid composition used for 3D printing, and a preparation method thereof, and belongs to the technical field of 3D printing material. The polylactic acid composition used for 3D printing comprises, by weight, 40 to 50 parts of PLA, 40 to 50 parts of a hydrophilic material, 5 to 10 parts of a polyurethane material, and 5 to 10 parts of nanometer grade active carbon; the polyurethane material is prepared through polymerization of dihydroxy terminated PLA, a dihydroxy terminated hydrophilic material, and a cyanate ester compound, or is prepared through polymerization of dihydroxy terminated PLA and a diisocyanate group terminated hydrophilic material. The raw materials of the polylactic acid composition are mixed at the above ratio, and are subjected to granulation so as to obtain the 3D printing material product. The 3D printing material is capable of realizing full color printing wherein aqueous dye is adopted for spray dyeing, is high in mechanical strength, and no pungent smell is generated in printing process.
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Description

technical field

[0001] The invention relates to the technical field of 3D printing materials, in particular to a polylactic acid composition for 3D printing and a preparation method thereof. Background technique

[0002] At present, PLA 3D printing consumables have become one of the most widely used consumables. Its good molding effect, no smell of printing, and high strength of the parts make it popular among many practitioners. On the other hand, PLA, like other FDM printing consumables, can only print monochrome at present, and the printing effect is monotonous; at the same time, because PLA is a hydrophobic material, it cannot be sprayed and colored with water-based dyes under normal circumstances. Contents of the invention

[0003] The technical problem to be solved by the present invention is to provide a PLA 3D printing consumable with good stability, good usability, and easy use of water-based dyes for spray dyeing and coloring.

[0004] In order to achieve the ab...

Examples

Embodiment 1

[0019] A polylactic acid composition for 3D printing, which consists of 45 parts of PLA, 45 parts of PCL, 5 parts of polyurethane material, and 5 parts of nano-scale activated carbon in parts by weight.

[0020] The preparation method of described polylactic acid composition, comprises the steps:

[0021] (1), the preparation of the PCL of double hydroxyl end-capping

[0022] Weigh 25g of PCL into a 500mL two-neck flask, add 250mL of chloroform, heat to 75°C, stir until fully dissolved, add 1,4-butanediol (or ethylene glycol, 1,3- transesterification reagents such as propylene glycol) and 2wt% p-toluenesulfonic acid (also can adopt the saturated fatty acid such as lauric acid, palmitic acid as catalyzer), carry out transesterification reaction, react 8-28 hour; After the reaction finishes, Cool naturally to normal temperature, then pour the solution into a separatory funnel pre-installed with 1L deionized water, filter under reduced pressure to obtain a transparent liquid, th...

Embodiment 2

[0032] A polylactic acid composition for 3D printing, which consists of 50 parts of PLA, 45 parts of PEG particles, 8 parts of polyurethane material, and 5 parts of nano-scale activated carbon in parts by weight.

[0033] The preparation method of described polylactic acid composition, comprises the steps:

[0034] (1), the preparation of the PLA of double hydroxyl end-capping

[0035] Weigh 25g PLA in a 500mL two-necked flask, add 250mL of chloroform, heat to 75°C and stir until fully dissolved, add 5 times the molar number of ethylene glycol (ester exchange reagent) and 2wt% p-toluenesulfonic acid (catalyst ) mixed solution for transesterification reaction, reacted for 8-28 hours; after the reaction was finished, naturally cooled to normal temperature, then poured the solution into a separatory funnel pre-equipped with 1L deionized water, filtered under reduced pressure to obtain a transparent liquid, Then through rotary distillation and vacuum precipitation, the PLA-diol m...

Embodiment 3

[0043] A polylactic acid composition for 3D printing, which consists of 40 parts of PLA, 40 parts of POE, 10 parts of polyurethane material, and 10 parts of nano-scale activated carbon in parts by weight.

[0044] The preparation method of the polylactic acid composition of this embodiment is the same as that of Example 2, the difference is that the hydrophilic material of this embodiment adopts POE, and the preparation of polyurethane material in step (2) is the preparation of POE-PLA intermediate material, POE-PLA HMDI is used as linking agent in the preparation of PLA intermediate material.

[0045] The reaction formula for preparing POE-PLA intermediate material (i.e. PLA-ran-POE) in the present embodiment is as follows:

[0046]