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Shape memory polymer alloy based on fused deposition 3D printing and its preparation method

A memory polymer and 3D printing technology, applied in the direction of additive processing, etc., can solve the problems of lack of functionality such as shape memory, lack of reversible phase and stationary phase, single component type, etc., to alleviate uneven volume shrinkage, improve Mechanical properties, the effect of reducing water absorption

Active Publication Date: 2020-04-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the Chinese invention patent applications CN103739954A, CN104086891A and CN106433108A and other polyolefin or nylon printing consumables have better overall performance, but due to the relatively simple component types of their raw materials, they only have inorganic fillers for improving printing performance and processing performance. Tougheners, additives and other components, but lack the reversible phase and stationary phase that are necessary for semi-crystalline polymer shape memory systems, and thus lack functionality such as shape memory, making its application subject to obvious functional limitations

Method used

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  • Shape memory polymer alloy based on fused deposition 3D printing and its preparation method
  • Shape memory polymer alloy based on fused deposition 3D printing and its preparation method
  • Shape memory polymer alloy based on fused deposition 3D printing and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0040] The preparation method of shape memory polymer alloy based on fused deposition 3D printing includes the following steps: According to the weight percentage of raw materials, 44wt% polypropylene plastic, 30wt% nylon 66, 22wt% POE-g-MAH, 1wt% The nano-silica was dried at 60°C for 5 hours, and then the above materials, 0.2wt% dicumyl peroxide DCP and 2.8wt% turpentine were put into a high-speed mixer for mixing. The mixing temperature was 50°C and the mixing time 20 minutes; the mixed raw materials are added to the twin-screw extruder for melt extrusion and pelletization, where the extrusion temperature is 250°C and the screw speed is 80r / min; the obtained pellets are dried at 60°C for 6 hours, Through melt extrusion in a twin-screw extruder, a polymer alloy wire with a diameter of 1.75±0.1mm that can be used for fused deposition 3D printing is obtained, where the extrusion temperature is 255°C and the screw speed is 40r / min.

[0041] The prepared wire is fed into the nozzle ...

Embodiment 2

[0051] 35wt% of high-density polyethylene, 30wt% of nylon 6 and 32wt% of EPDM-g-MAH, 2.5wt% of nano calcium carbonate were dried at 80°C for 4 hours, and then the above materials were mixed with 0.5wt% of diisopropyl peroxide The propylene benzene DCP is put into a high-speed mixer for mixing at a mixing temperature of 60°C and a mixing time of 15 minutes; the mixed raw materials are added to the twin-screw extruder for melt extrusion and granulation, where the extrusion temperature is 235°C, The screw speed is 70r / min; the obtained pellets are dried at 80°C for 5 hours and then melted and extruded through a twin-screw extruder to obtain a polymer alloy with a diameter of 1.75±0.1mm that can be used for fused deposition 3D printing Wire, where the extrusion temperature is 235°C, and the screw speed is 50r / min.

[0052] The test strips were prepared by fused deposition 3D printing, where the printing arrangement was ±45°, the printing filling rate was 100%, the nozzle temperature ...

Embodiment 3

[0054] Dry 38wt% polypropylene, 30wt% nylon 1010, 28wt% SEBS-g-MAH, 3wt% nano silica at 70°C for 5 hours, and then combine the above materials with 0.3wt% dicumyl peroxide DCP and 0.7wt% styrene were put together in a high-speed mixer for mixing. The mixing temperature was 40°C and the mixing time was 30 minutes; the mixed raw materials were added to the twin-screw extruder to be melted, extruded and pelletized. The extrusion temperature The temperature is 230°C and the screw speed is 60r / min; the pellets obtained are dried at 80°C for 4 hours, and then melted and extruded through a twin-screw extruder to obtain a diameter of 1.75±0.1mm that can be used for fused deposition 3D printing Polymer alloy wire, where the extrusion temperature is 210°C and the screw speed is 60r / min. The test strips were prepared by fused deposition 3D printing, where the printing arrangement was ±45°, the printing filling rate was 80%, the nozzle temperature of the printing device was 230°C, and the ...

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Abstract

The invention discloses a shape memory polymer alloy for fused deposition based 3D printing and a preparation method of the shape memory polymer alloy. The polymer alloy is prepared from raw materialsin percentage by weight as follows: 30%-50% of polyolefin plastics, 10%-40% of nylon resin, 20%-40% of thermoplastic elastomer graft, 0.1%-1% of a peroxide crosslinking agent, 0-5% of an assistant crosslinking agent and 1%-5% of a nanofiller. The raw materials mixed by a high-speed mixer are subjected to melt extrusion molding, and the polymer alloy suitable for fused deposition based 3D printingcan be obtained. The prepared polymer alloy has excellent 3D printing performance, so that a printed product has the characteristics of being low in warping degree, high in dimensional stability, better in mechanical property and heat resistance and the like and has a smooth surface without defects and an excellent thermally induced shape memory function, and the printed product are higher in shape fixed rate and shape recovery rate, and the application requirement of a shape memory product can be met.

Description

Technical field [0001] The invention relates to a 3D printing polymer consumable, in particular to a shape memory polymer alloy based on fused deposition 3D printing and a preparation method thereof. Background technique [0002] 3D printing technology is a rapid prototyping technology developed in the 1980s. According to the working principle, it can be divided into selective laser sintering technology, three-dimensional light curing technology, fused deposition molding technology, etc. Among them, fused deposition molding has become one of the most widely used 3D printing technologies due to its simple principle, convenient operation, and low cost. It can be widely used in medical, automotive, military, aerospace, electronic products, education and culture. , Art design and other fields. [0003] As the development of 3D printing technology matures, people's needs are far more than just "3D printing". The concept of "4D printing" proposed in 2013 has aroused widespread interest ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L77/06C08L23/06C08L77/02C08L51/04C08L51/00C08K3/26C08L23/08C08L51/06C08K3/36C08K5/14B33Y70/10B33Y80/00
CPCB33Y70/00B33Y80/00C08K2003/265C08K2201/011C08L23/06C08L23/0815C08L23/12C08L2207/062C08L77/06C08L51/06C08K3/36C08K5/14C08L77/02C08L51/04C08K3/26C08L51/006
Inventor 何慧彭晓冬贾雲超刘灏黄柏耿一
Owner SOUTH CHINA UNIV OF TECH
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