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Silicone rubber composite material for fused deposition 3D printing and preparation method thereof

A composite material and 3D printing technology, applied in the direction of 3D object support structure, additive manufacturing, manufacturing tools, etc., can solve the problems of poor thermal conductivity, shrinkage cavity of printing wire, and psychological pressure of patients, so as to improve bonding performance and anti-corrosion Fatigue cracking performance, ensuring molding dimensional accuracy and appearance, and the effect of excellent high and low temperature toughness

Active Publication Date: 2019-12-03
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of light-curing material also has many disadvantages, such as high brittleness, and sometimes it will be damaged during the implementation process, which will cause certain psychological pressure on the patient accordingly.
Moreover, even if it has passed the relevant strict medical certification, such polymer materials are not fully cross-linked due to the artificial operation of the equipment manufacturer, resulting in incomplete cross-linking of the material during the photo-curing process, and there will still be trace amounts of monomers or oligomers remaining in the equipment, its unpleasant smell can also make patients feel uncomfortable
Although the industry intends to use polypropylene and polyolefin elastomers as 3D printing materials, and has done a lot of exploration, due to the large shrinkage rate of polyolefin materials and poor thermal conductivity, a large number of shrinkage cavities appear when preparing printing wires. and other defects, the melt solidification / solidification rate is slow during the printing process, which affects the printing accuracy

Method used

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  • Silicone rubber composite material for fused deposition 3D printing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Take by weighing each raw material according to the following proportioning: silicone rubber (Shore A hardness 85) mass fraction is 58.0 parts, modified PVB mass fraction is 7.0 mass fraction, white carbon black mass fraction is 20.0 mass fraction, tricalcium phosphate mass fraction The parts are 10.0 parts, the EPDM grafted substance is 3.0 parts, the aminosilane coupling agent KH550 is 0.5 parts, the crosslinking agent is 0.5 parts, and the lubricant is 1.0 parts.

[0059] Add silicone rubber, modified PVB, white carbon black, tricalcium phosphate, EPDM graft, aminosilane coupling agent, crosslinking agent and lubricant to the mixer in sequence for pre-mixing. The mixing temperature is 20-25°C. The rotation speed was 300 rpm and the mixing time was 2 minutes.

[0060] The pre-mixed material is fed into the extensional rheological extruder from the feeder, melted and extruded to granulate, the screw speed is 250 rpm, and the main feeder speed is 50 rpm. The temperatur...

Embodiment 2

[0063] Take by weighing each raw material according to the following proportioning: silicone rubber (Shore A hardness 90) mass fraction is 45.7 mass fractions, PVB mass fraction is 6.0 mass fractions, silica mass fraction is 25.0 mass fractions, tricalcium phosphate mass fractions 15.0 parts, 5.0 parts by mass of EPDM grafted substance, 1.0 parts by mass of aminosilane coupling agent KH550, 0.8 parts by mass of crosslinking agent, and 1.5 parts by mass of lubricant.

[0064] Add silicone rubber, modified PVB, white carbon black, tricalcium phosphate, EPDM graft, aminosilane coupling agent, crosslinking agent and lubricant to the mixer in sequence for pre-mixing. The mixing temperature is 25-30°C. The rotational speed was 250 rpm and the mixing time was 3 minutes.

[0065] The pre-mixed material is fed into the extensional rheological extruder from the feeder, melted and extruded to granulate, the screw speed is 300 rpm, and the main feeder speed is 60 rpm. The temperature of ...

Embodiment 3

[0068] Take by weighing each raw material according to the following ratio: silicone rubber (Shore A hardness 95) mass fraction is 48.8 parts, modified PVB mass fraction is 5.0 mass fraction, white carbon black mass fraction is 28.0 mass fraction, tricalcium phosphate mass fraction The parts are 12.0 parts, the EPDM grafted substance is 2.0 parts, the aminosilane coupling agent KH550 is 1.2 parts, the crosslinking agent is 1.0 parts, and the lubricant is 2.0 parts.

[0069] Add silicone rubber, modified PVB, white carbon black, tricalcium phosphate, EPDM graft, aminosilane coupling agent, crosslinking agent and lubricant into the mixer in sequence for pre-mixing. The mixing temperature is 22-26°C. The rotational speed was 280 rpm and the mixing time was 1.5 minutes. The pre-mixed material is fed into the extensional rheological extruder from the feeder, melted and extruded to granulate, the screw speed is 150 rpm, and the main feeder speed is 55 rpm. The temperature of each s...

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Abstract

The invention discloses a silicone rubber composite material for fused deposition 3D printing and a preparation method thereof. The invention discloses the silicone rubber composite material which canbe used in a fused deposition 3D printing process, has adjustable hardness, and has a fatigue resistant function, and a preparation method thereof. The composite material comprises the following components in parts by mass: 45.7-58.0 parts of a silicone rubber, 5.0-7.0 parts of a modified PVB, 20.0-28.0 parts of white carbon black, 10.0-15.0 parts of calcium phosphate, 2.0-5.0 parts of a EPDM graft, 0.5-1.2 parts of an amino-silane coupling agent, 0.5-1.0 part of a crosslinking agent, and 1.0-2.0 parts of a lubricant. Through rheological extruder blending and reaction compatibilization, compatibility of the silicone rubber, the bonding resin PVC with the inorganic reinforcing materials is improved, so that the silicone rubber composite material is endowed with good mechanical properties,fatigue resistance and adjustable hardness. The product is particularly suitable for production of fused deposition 3D printed dental medical equipment.

Description

technical field [0001] The invention belongs to the field of polymer materials and their molding processing, in particular to a silicone rubber composite material used for fused deposition (FDM) 3D printing and a preparation method thereof. Background technique [0002] With the development and progress of society, people will put more social wealth into various social activities to obtain high-quality and healthy life. Especially with the improvement of medical level and the continuous update of human health cognition in related research fields, people are gradually focusing on the health care and repair of the oral cavity, especially the masticatory system. Because the continuously improved living standards have not only improved people's quality of life and physical fitness, but also brought great pressure to the chewing system, especially the teeth. [0003] At present, the domestic medical system and management system determine that the treatment of dental caries and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L29/14C08L51/04C08L27/18C08K13/02C08K5/544C08K3/36C08K3/32C08K5/14B29C64/118B33Y70/00
CPCC08L83/04B29C64/118B33Y70/00C08L2203/02C08L2205/035C08K2003/325C08K2201/011C08L29/14C08L51/04C08L51/003C08L27/18C08K13/02C08K5/544C08K3/36C08K3/32C08K5/14
Inventor 杨军忠任力
Owner SOUTH CHINA UNIV OF TECH
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