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Self-repair organosilicon material preparation method

An organosilicon and three-necked flask technology is applied in the field of self-healing organosilicon material preparation, which can solve the problems of inability to achieve mass production, complex synthesis process, poor mechanical properties, etc. The effect of mechanical properties

Active Publication Date: 2019-04-05
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its poor mechanical properties, it cannot be applied in some fields that have certain requirements for mechanical properties. At the same time, there is a problem that the synthesis process is complicated and mass production cannot be realized.

Method used

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  • Self-repair organosilicon material preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The process of the preparation method of the self-healing silicone material involved in this embodiment includes three steps of generating urea groups, generating imine bonds and preparing materials:

[0025] (1) Generating urea groups: add 20 g of amino-terminated polydimethylsiloxane (PDMS) and 100 mL of tetrahydrofuran (THF) to a 500 mL three-necked flask, stir evenly, and feed nitrogen into the three-necked flask to get rid of the three-necked flask. Air, add 1.31g of dicyclohexylmethane diisocyanate dropwise into the three-necked flask with a syringe, under nitrogen atmosphere, 90°C oil bath, magnetic stirring, condensing and reflux for 20h, PDMS and dicyclohexylmethane diisocyanate react to form urea groups;

[0026] The molar ratio of PDMS to dicyclohexylmethane diisocyanate is 2:1,

[0027] (2) Generation of imine group: add 0.67g of isophthalaldehyde powder into the three-necked flask, and after magnetic stirring reaction at room temperature for 3 hours, raise ...

Embodiment 2

[0031] The process of the preparation method of the self-healing silicone material involved in this embodiment includes three steps of generating urea groups, generating imine bonds and preparing materials:

[0032] (1) Generating urea groups: add 20 g of amino-terminated polydimethylsiloxane (PDMS) and 100 mL of tetrahydrofuran (THF) to a 500 mL three-necked flask, stir evenly, and feed nitrogen into the three-necked flask to get rid of the three-necked flask. Air, add 1.01g of hexamethylene diisocyanate dropwise into the three-necked flask with a syringe, under nitrogen atmosphere, 80°C oil bath, magnetic stirring, condensing and reflux for 30h, PDMS and hexamethylene diisocyanate react to form urea groups;

[0033] The molar ratio of PDMS to hexamethylene diisocyanate is 2:1.2,

[0034] (2) Generation of imine groups: add 0.54 g of phthalaldehyde powder to a three-necked flask, and after magnetically stirring for 5 hours at room temperature, raise the temperature to 60° C. ...

Embodiment 3

[0038] The process of the preparation method of the self-healing silicone material involved in this embodiment includes three steps of generating urea groups, generating imine bonds and preparing materials:

[0039] (1) Generating urea groups: add 20 g of amino-terminated polydimethylsiloxane (PDMS) and 100 mL of tetrahydrofuran (THF) to a 500 mL three-necked flask, stir evenly, and feed nitrogen into the three-necked flask to get rid of the three-necked flask. Air, add 1.11g of isophorone diisocyanate dropwise into the three-necked flask with a syringe, under nitrogen atmosphere, 110°C oil bath, magnetic stirring, condensing and reflux for 12h, PDMS and isophorone diisocyanate react to form urea groups;

[0040] The molar ratio of PDMS to isophorone diisocyanate is 2:1,

[0041] (2) Generation of imine groups: Add 0.67g of terephthalaldehyde powder into a three-necked flask, and after magnetically stirring at room temperature for 4 hours, raise the temperature to 70°C and con...

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Abstract

The invention belongs to the technical field of preparation of self-repair materials, and particularly relates to a self-repair organosilicon material preparation method. The technological process comprises three steps of generation of ureido, generation of an imine bond and preparation of the material. An elastomeric material which can self-repair damage at room temperature is generated by three-system reaction the ureido and the imine bond are introduced in a PDMS crosslinking system, wherein the PDMS reacts with a diisocyanate to form the ureido, and an intermolecular hydrogen bond formed by the ureido can increase the crosslinking density of the material, enhance the mechanical properties of the material and improve the mechanical strength of the material; the stable imine bond generated by reaction of an aldehyde group and an amino can realize an excellent self-repairing function of the material; by controlling the use amounts of isocyanate and phthalaldehyde, the mechanical properties and the self-repairing performance of the material can be regulated and controlled, and the preparation method is simple and feasible; the manufacturing cost of the material is greatly reduced;the joint action of the hydrogen bond and the imine bond guarantees the mechanical strength of the material and considers the self-repairing performance of the material.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of self-repairing materials, and in particular relates to a method for preparing a self-repairing organosilicon material. The prepared polydimethylsiloxane material has excellent mechanical properties and is capable of self-repairing damage at normal temperature. Background technique: [0002] In recent years, with the development of science and technology, silicone materials have been widely used in various fields such as material surface protection (such as anti-biofouling, anti-corrosion, anti-icing, etc.), flexible electronic devices, and biomaterials. Organosilicon, that is, organosilicon compound, refers to a compound that contains Si-C bonds and at least one organic group is directly connected to a silicon atom. Linked compounds are also known as organosilicon compounds. Among them, the polysiloxane composed of silicon-oxygen bond (-Si-O-Si-) as the skeleton is the most numerous, the ...

Claims

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Application Information

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IPC IPC(8): C08G77/388C08G77/38
CPCC08G77/38C08G77/388
Inventor 孙智勇陈光孟蔺存国张金伟郑纪勇
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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