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Biodegradable wire used for fused deposition molding and preparation method thereof

A technology of fused deposition molding and filament materials, which is applied in the field of 3D printing technology and plastic processing, can solve the problems affecting the application performance of PHA materials, the melting index cannot be too low, and the comprehensive mechanical properties are not good, so as to achieve large-scale promotion and production , Facilitate rapid removal and enhance the effect of dissolution performance

Active Publication Date: 2017-09-08
HENAN INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydroxyl and ester bonds form a large number of intramolecular and intermolecular hydrogen bonds in the PHA material, resulting in a melting point temperature very close to the decomposition temperature, a relatively narrow processing temperature window, and PHA materials have poor toughness and poor comprehensive mechanical properties, which all affect Application performance of PHA material in FDM
Finally, in order to meet the requirements of FDM, the melt index of the PHA material should not be too low. If the melt viscosity is too high, it will not be able to be extruded from the nozzle of the printer. The PHA material also needs to have sufficient mechanical strength to support the part.

Method used

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  • Biodegradable wire used for fused deposition molding and preparation method thereof
  • Biodegradable wire used for fused deposition molding and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] The preparation method of the biodegradable silk material for fused deposition molding of the present invention, the steps are as follows:

[0048] (1) Drying treatment of raw materials: poly-3-hydroxybutyrate-co-3-hydroxyvalerate copolymer, plasticizer, solubilizer, filler and auxiliary agent are dried at a constant temperature of 90 °C for more than 7 hours to remove residual water part, dry the raw material completely;

[0049] (2) Mixing of raw materials: First mix poly-3-hydroxybutyrate-co-3-hydroxyvalerate copolymer and plasticizer evenly, and then put it into high-speed mixer together with solubilizer, filler and auxiliary agent Stir and mix in medium, then add antioxidant, stir and mix for 30 minutes to obtain mixed raw materials;

[0050] (3) Heated extrusion: Add the mixed raw materials into the twin-screw extruder, and keep the feeding speed uniform and smooth to ensure that there is no blockage during the extrusion process, and the filament is stable and sm...

Embodiment 1-3 and comparative example 1

[0053] According to the composition of each component in Comparative Example 1 and Examples 1-3 in Table 1, the biodegradable silk was prepared according to the above preparation method.

[0054] In Examples 1-3 and Comparative Example 1, the number average molecular weight of the poly-3-hydroxybutyrate-co-3-hydroxyvalerate copolymer (PHBV) used is 100,000, and the 3-hydroxyvalerate in the copolymer The molar ratio of chain segments is 20%, the plasticizer is triethyl citrate, the solubilizer is polyvinyl alcohol, the degree of polymerization of polyvinyl alcohol is 1500, the degree of hydrolysis is 75%, and the antioxidant is antioxidant 1010 (Tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester).

[0055] Table 1 Material formulations of Examples 1-3 and Comparative Example 1 (weight / part)

[0056]

[0057] The biodegradable silk materials prepared in Examples 1-3 and Comparative Example 1 were tested for water solubility, processability and mel...

Embodiment 4-8

[0063] Table 2 Embodiment 4-8 material formula (weight / part)

[0064]

[0065] Table 2 is the specific formulation and performance test results of the biodegradable silk materials prepared in Examples 4-8. It can be seen from Table 2 that within the scope of the components of the present invention, the prepared biodegradable silk has excellent solubility and processing properties, and the silk can be quickly dissolved and removed within 40 minutes at room temperature, which is very suitable as a FDM is used with support materials.

[0066] The present invention unexpectedly finds that the poly-3-hydroxybutyrate-co-3-hydroxyvalerate copolymer (PHBV) with good biodegradability has a molar ratio of 3-hydroxyvalerate segments in a certain range The internal time copolymer has good solubility in ethanol. The biodegradable silk material does not need to use strong alkali or strong acid aqueous solution or organic solvents (such as acetone, chloroform, etc.), and can be removed ...

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Abstract

The invention discloses a biodegradable wire used for fused deposition molding and a preparation method thereof. The wire is prepared from 100 parts of poly 3-hydroxybutyrate-co-3-methyl-3-hydroxyvalerate copolymer (the number average molecular weight is 5-150 thousand), 10-25 parts of plasticizer, 10-15 parts of chaotropic agent, 0.1-1 part of antioxidant, 0.1-8 parts of filler and auxiliaries, wherein the molar ratio of a 3-methyl-3-hydroxyvalerate chain segment in a copolymer is 20-35%, the plasticizer refers to one or a mixture of triethyl citrate, acetyl tributyl citrate, pentaerythritol and bisphenol A, and the chaotropic agent refers to one or a mixture of polyvinyl alcohol and polyethylene glycol. After the chaotropic agent and the plasticizer are added, the biodegradable wire can be removed completely in a very short period of time, the chaotropic agent a has certain plasticization effect on the biodegradable wire, and through the synergistic effect of the plasticizer and the chaotropic agent, the processability and mechanical properties of the biodegradable wire can be further improved.

Description

technical field [0001] The invention belongs to the fields of 3D printing technology and plastic processing, and in particular relates to a biodegradable silk material for fused deposition molding and a preparation method thereof. Background technique [0002] 3D printing technology is a technology for manufacturing objects by printing materials such as metal or plastic layer by layer based on digital model files. In today's manufacturing industry, 3D printing technology has become more and more competitive, and has been applied in many fields such as information technology, material science, and precision machinery. In 3D printing technology, Fused Deposition Molding (FDM) is a method of processing thermoplastic filaments through solid-melt-solid double phase transition. The thermoplastic filament is heated to a molten state in the nozzle and then extruded. According to the two-dimensional cross-sectional information provided by the computer, it is selectively coated with ...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L29/04C08L71/02C08L23/06C08K5/134C08K5/20C08K5/098C08K5/11C08K5/053C08K5/13C08K5/526B33Y70/00D01F6/92D01F1/10
CPCB33Y70/00C08K5/098C08K5/11C08K5/1345C08K5/20C08L67/04C08L2201/06C08L2201/08C08L2203/12C08L2205/03C08L2205/035D01F1/10D01F6/92C08L29/04C08L71/02C08L23/06C08K5/053C08K5/13C08K5/526
Inventor 于翔王娜杨柳卢晓龙王延伟
Owner HENAN INST OF ENG
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