Dual component liquid silica gel for 3D printing and printing method thereof

A liquid silicone and 3D printing technology, applied in the field of 3D printing, can solve the problems of undisclosed two-component mixed silicone technology details, loss of some characteristics of silicone, clogging of printing nozzles, etc., to achieve long-term thickening excellent, improve printing accuracy and Excellent surface quality and good elasticity

Active Publication Date: 2019-08-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above three 3D printing technologies must introduce photosensitive groups and photoinitiators into silica gel, thus losing some of the characteristics of silica gel, and at the same time have certain toxicity, which cannot meet the requirements of food, medical and other fields
[0005] Chinese invention patent CN105643939B discloses a silica gel 3D printer and its printing method. Chinese invention patent application CN107674429A discloses a 3D printing silica gel and its printing method. The silica gel materials involved in these two patent technologies are all single-component silica gel materials. Short shelf life, potential risk of print head clogging due to viscosification, gels or coarse particles when printing
[0006] Chinese invention patent application CN106313505A discloses a two-component mixed silica gel 3D printer and its printing method, but does not disclose the technical details of the two-component mixed silica gel used, and the temperature of the ring-shaped heating plate used during printing is as high as 100-400 °C (preferably 300 °C, see Chinese invention patent application CN107638231A), it is very easy to cause the print nozzle at the center to be blocked by the high-temperature gel of the internal silica gel
In addition, there are currently no mature 3D printing silicone and silicone 3D printers on the market, so the development and popularization of 3D printing silicone and silicone 3D printers is an important development direction

Method used

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  • Dual component liquid silica gel for 3D printing and printing method thereof
  • Dual component liquid silica gel for 3D printing and printing method thereof
  • Dual component liquid silica gel for 3D printing and printing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) 100g of α with a viscosity of 2Pa·s and a vinyl content of 0.65mol%, ω-divinylpolydimethylsiloxane, 5g of chloroplatinic acid divinyltetramethyldisiloxane, 10g Polyoxypropylene diol with a molecular weight of 4000, 1g of hydrophilic fumed silica, 10g of calcium carbonate and 1g of food-grade blue silica gel pigment were added to a stirring tank and mixed evenly, then removed to a three-roll machine and ground to a fineness <100 μm, and then Move it into a stirred tank and stir at room temperature for 2 hours under the condition of a vacuum degree of -0.1MPa, and finally filter under high pressure, move into the first cylinder C with a piston and seal it for storage, and obtain component A;

[0052] (2) 80 g of α, ω-divinyl polydimethylsiloxane with a viscosity of 2 Pa·s and a vinyl content of 0.65 mol%, and 20 g of α with a viscosity of 200 Pa·s and a vinyl content of 0.06 mol% , ω-divinyl polymethylphenylsiloxane, 30g viscosity is 0.02Pa·s, hydrogen content is 1% m...

Embodiment 2

[0058] (1) 100g of α, ω-divinylpolydimethylsiloxane with a viscosity of 2Pa·s and a vinyl content of 0.65mol%, 0.01g of chloroplatinic acid, 2g of polyoxypropylene-oxyethylene copolyether Pluronic -L35, 4g of hydrophilic fumed silica and 6g of vinyl MQ resin were added to the stirred tank and mixed evenly, then removed to a three-roll machine and ground to a fineness <100μm, and then moved into the stirred tank under the condition of a vacuum of -0.1MPa Stir at room temperature for 2 hours, and finally filter under high pressure, move into the first cylinder C with a piston and seal it for storage to obtain component A;

[0059] (2) 70 g of α with a viscosity of 10 Pa·s and a vinyl content of 0.2 mol%, ω-divinylpolydimethylsiloxane, 30 g of α with a viscosity of 3 Pa·s and a vinyl content of 10 mol%, ω-Divinylpolymethylvinylsiloxane, 50g of methylphenyl hydrogen-containing polysiloxane with a viscosity of 0.2Pa·s and a hydrogen content of 0.1%, 0.01g of tetramethyltetravinylcy...

Embodiment 3

[0065] (1) 100g of α with a viscosity of 1Pa·s and a vinyl content of 0.8mol%, ω-divinyl polydimethylsiloxane, 0.2g of chloroplatinic acid-diethyl phthalate, 2g of Add 2000 polyoxypropylene diol, 4g hydrophobic fumed silica and 6g kaolin into the stirring tank and mix evenly, move it to a three-roll machine and grind it to a fineness <100μm, then move it into the stirring tank at a vacuum of -0.1MPa Stir at room temperature for 2 hours under certain conditions, and finally filter under high pressure, move into the first barrel C with a piston and seal it for preservation, and obtain component A;

[0066] (2) 50g of α with a viscosity of 0.2Pa·s and a vinyl content of 2mol%, ω-divinyl polydimethylsiloxane, 50g of α with a viscosity of 10Pa·s and a vinyl content of 3mol%, ω-Divinylpolymethylvinylsiloxane, 20g of phenyl hydrogen-containing silicone resin with a viscosity of 0.15Pa·s and a hydrogen content of 0.7%, 0.1g of azobenzene-4,4'-dicarboxylic acid di Methyl ester, 2g pol...

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Abstract

The invention discloses a dual component liquid silica gel for 3D printing and a printing method thereof. The liquid silica gel comprises a component A and a component B. The component A comprises following components in parts by weight: 100 parts of vinyl polysiloxane, 0.01 to 5 parts of a hydrosilylation catalyst, 1 to 10 parts of polyether polyol, and 1 to 10 parts of fumed silica. The component B comprises following components in parts by weight: 100 parts of vinyl polysiloxane, 1 to 50 parts of hydrogen containing polysiloxane, 0.01 to 5 parts of a hydrosilylation inhibitor, 1 to 10 partsof polyether polyol, and 1 to 10 parts of fumed silica. During the printing process, the thickness of the liquid silica gel does not change, the structure is not deformed, an onsite heat treatment isnot needed, only post sectioned thermosetting moulding is needed, the printing technology is simplified, and the printing cost is reduced. The liquid silica gel does not contain any organic solvent or photosensitive component, is very safe and nontoxic, and 3D products prepared from the liquid silica gel can be applied to fields, which have high safety requirements, such as children toys, food, medicines, and the like.

Description

technical field [0001] The invention relates to the field of 3D printing, in particular to a two-component liquid silica gel for 3D printing and a printing method thereof. Background technique [0002] Addition-type liquid silicone is made of polyorganosiloxane containing vinyl as the base polymer, and polyorganosiloxane containing Si-H bonds as the crosslinking agent. In the presence of platinum catalyst, it can be crosslinked at room temperature or under heating. A class of silicone materials that vulcanize. Liquid silica gel does not produce by-products during the cross-linking vulcanization process, the shrinkage rate is extremely small, it can be cured in deep layers, it is non-toxic and non-corrosive, and the vulcanized liquid silica gel has excellent physical, mechanical and electrical properties, as well as good high and low temperature performance and weather resistance. Good, low surface tension, environmentally friendly, non-flammable and other characteristics, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08L71/02C08K3/36B29C64/118B29C64/336B29C64/40B33Y10/00B33Y30/00B33Y70/00
CPCB33Y10/00B33Y30/00B33Y70/00B29C64/118B29C64/336B29C64/40C08L83/04C08L2205/025C08L2205/035C08L71/02C08K3/36
Inventor 侯有军
Owner SOUTH CHINA UNIV OF TECH
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