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A kind of 3D printing silicone rubber and its preparation method and application

A 3D printing and silicone rubber technology, which is applied in the field of 3D printing silicone rubber and its preparation, can solve the problems of single printing method, low cost, and low mechanical strength, and achieve simple and easy-to-control synthesis process, improved mechanical strength, and easy access to raw materials Effect

Active Publication Date: 2021-10-12
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a 3D printed silicone rubber and its preparation method and application for the existing 3D printed silicone rubber with a single printing means and low mechanical strength. The urea dynamic bond is obtained by the reaction of pyrazole and isocyanate. It is a new type of heat-responsive dynamic bond, which enables the cross-linked silicone rubber material to heat and flow, and has thermal processability. It can be used for direct writing of heating ink, fuse manufacturing, selective Laser sintering, inkjet 3D printing and other 3D printing processing methods, while the dynamic bond reaction enhances the interlayer bonding force of the printed product, reduces the anisotropy of the mechanical strength of the product, and makes the printed product have a self-repair function, and the printed product is damaged. It can be completely repaired at 120°C, and in addition, the mechanical strength of the material is improved. The silicone rubber of the present invention has excellent mechanical properties, is suitable for various 3D printing methods, has self-repair function, simple preparation process, and relatively low cost

Method used

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  • A kind of 3D printing silicone rubber and its preparation method and application
  • A kind of 3D printing silicone rubber and its preparation method and application
  • A kind of 3D printing silicone rubber and its preparation method and application

Examples

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Effect test

Embodiment 1

[0039] A 3D printing silicone rubber, comprising 2-12 parts of crosslinking agent, 18-31 parts of polydimethylsiloxane terminated by amino or hydroxyl group, 10-41 parts of diisocyanate, 5-35 parts of aminopyrazole compound, 20 ~50 parts solvent.

[0040] The preparation method of described 3D printing silicone rubber is:

[0041] Step 1: Weigh 2 to 12 parts of crosslinking agent, 18 to 31 parts of amino or hydroxyl terminated polydimethylsiloxane, 10 to 41 parts of diisocyanate, 5 to 35 parts of aminopyrazole compound, 20 to 50 parts of solvent, and dissolve the raw materials in the solvent to obtain a reaction liquid, and stir and react at room temperature for 2 to 10 hours to obtain a prepolymer;

[0042] Step 2: Pour the polymer obtained in Step 1 into a mold, put it in an oven at 80°C to remove the solvent and continue curing for 10 to 96 hours. The solvent vapor is recovered by a solvent recovery machine. 3D-printed silicone rubber solids with dynamic bonds of fenoxuro...

Embodiment 2

[0052] 5.4 g of aminopropyl-terminated polydimethylsiloxane DMS-A15, 0.532 g of isophorone diisocyanate, 0.1 g of 3-amino-5-tert-butylpyrazole, and 0.2 g of hexamethylene diisocyanate trimerized The solid was dissolved in 20ml of tetrahydrofuran, and stirred at room temperature for 3 hours to obtain a prepolymer after the reaction was completed. The prepolymer obtained by the reaction was poured into a polytetrafluoroethylene mold, and then placed in an oven at 80°C to continue curing for 24 hours, and then from Take out the silicone rubber solid containing pyrazole urea dynamic bond from the mold, the raw material and the chemical structure of the synthetic silicone rubber are as follows: figure 1 As shown, the obtained silicone rubber is detected by infrared spectroscopy, and the detection results are as follows figure 2 As shown, the actual image 3 shown. The powder obtained after pulverizing the silicone rubber solid in a low-temperature pulverizer is as follows: Fig...

Embodiment 3

[0055] Use 5.4g of aminopropyl-terminated polydimethylsiloxane DMS-A15, 0.532g of isophorone diisocyanate, 0.08g of p-phenylenediamine and 0.2g of hexamethylene diisocyanate trimer dissolved in 20ml of tetrahydrofuran , stirred and reacted at room temperature for 3 hours. After the reaction, pour the prepolymer into a polytetrafluoroethylene mold, and then put it in an oven at 80°C to continue curing for 24 hours. After that, it was taken out from the mold to obtain a non-dynamic polymer containing ordinary urea bonds. Compared to silicone rubber solids.

[0056] Embodiment 2 is obtained the silicone rubber solid containing pyrazole uron dynamic bond (such as Figure 9 shown) and the non-dynamic contrast silicone rubber solid containing common urea bonds obtained in Example 3 (such as Figure 10 shown) under the conditions of 120 ° C and 10 MPa for 30 minutes, respectively, the shapes of the silicone rubber solid containing pyrazolamide dynamic bonds and the non-dynamic contr...

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Abstract

The invention belongs to the technical field of new materials, and provides a 3D printing silicone rubber and its preparation method and application. The 3D printing silicone rubber mainly includes amino or hydroxyl-terminated polydimethylsiloxane, diisocyanate, aminopyrazole compound, cross-linked Linking agent and solvent, the preparation method of 3D printing silicone rubber is: dissolving amino or hydroxyl terminated polydimethylsiloxane, diisocyanate, aminopyrazole compound and crosslinking agent in the solvent according to the amount of certain substances The prepolymer is obtained by stirring and reacting in the middle. After the reaction is completed, the prepolymer is added to the mold, heated and cured, and the solvent is removed to obtain a 3D printing silicone rubber material. The silicone rubber of the present invention has good mechanical strength and good thermoplasticity, and is suitable for various 3D printing processing methods such as ink direct writing (DIW), fused filament manufacturing (FFF), selective laser sintering (SLS), and inkjet 3D printing (3DP) The printed products are non-toxic and harmless, with self-healing function, and can be used in flexible electronics, biomedical and other fields.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a 3D printing silicone rubber and its preparation method and application. Background technique [0002] The main chain of polysiloxane is composed of silicon and oxygen atoms alternately, and the silicon atoms are directly connected with organic groups. It has the characteristics of both inorganic and organic polymers, such as high and low temperature resistance, weather aging resistance, electrical insulation, ozone resistance, Hydrophobic, good gas permeability, non-toxic, biologically inert, etc. It is widely used in electrical and electronic, construction, automobile, textile, medical and other fields. Polysiloxane has flexible molecular chains and low intermolecular forces, so it is usually used in the form of cross-linked elastomers. Traditional silicone rubber products can only be manufactured by injection molding process. The disadvantages are high technical require...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/79C08G18/65C08G18/61C08G18/32B33Y70/00
CPCB33Y70/00C08G18/324C08G18/3246C08G18/61C08G18/6529C08G18/755C08G18/79
Inventor 夏和生孙劭杰王占华王金志
Owner SICHUAN UNIV
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