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Triple-repair double-crosslinked polysiloxane super-hydrophobic elastomer and preparation method thereof

A technology of polysiloxane and elastomer, applied in the direction of coating, etc., to achieve the effect of easy operation, good product performance and simple preparation process

Active Publication Date: 2021-07-23
SOUTHWEAT UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are relatively few studies on the repair of penetrating damage (cutting, needle sticking, etc.) on the micron scale of superhydrophobic materials, and additional conditions such as temperature, humidity, and light are required for repair, which limit the use.
There is no literature report on the realization of triple restoration

Method used

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  • Triple-repair double-crosslinked polysiloxane super-hydrophobic elastomer and preparation method thereof
  • Triple-repair double-crosslinked polysiloxane super-hydrophobic elastomer and preparation method thereof
  • Triple-repair double-crosslinked polysiloxane super-hydrophobic elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Triple-repaired double-crosslinked polysiloxane superhydrophobic elastomer, the compound (i.e. triple-repaired double-crosslinked polysiloxane superhydrophobic elastomer, or a novel silicone elastomer with imine / coordination double-crosslinked structure , or super-hydrophobic self-healing polydimethylsiloxane elastomer, referred to as HB-imine-BZn-PDMS) has the chemical structural formula shown in (I):

[0040]

[0041] In the formula: x:y:z:=90:8:2;

[0042] The basic feature of the compound (I) is: transparent orange-yellow elastomer; the structural characterization is as follows: infrared spectrum IR (KBr tablet, cm -1 ): 1640(C=N), 1310(B-O); 1 H NMR (600MHz, CDCl 3 ) δ (ppm): 10.0 (-CHO), 3.8 (b-O-H); the molecular weight is ~11800 (molecular weight is about 11800), and the molecular weight distribution is 3.75.

Embodiment 2

[0044] The preparation method of the double-crosslinked polysiloxane superhydrophobic elastomer of triple repair, the steps are as follows:

[0045] a. Preparation of (2-formylphenylboronic acid) zinc chloride [abbreviated as CHO-Bz]:

[0046] Add 0.45 to 0.55 g of 2-formylphenylboronic acid into a reactor (such as a 50 mL flask, etc.), add 18 to 22 mL of ethanol, ultrasonically disperse, add 0.22 to 0.24 g of zinc chloride, and stir (at room temperature) for 22 ~26 hours. Ethanol was rotary distilled at a temperature of 40-60° C. to obtain (orange product) (2-formylphenylboronic acid) zinc chloride [abbreviated as CHO-Bz], and set aside;

[0047] b. Preparation of side chain aminated polysiloxane [abbreviated as AP-PDMS]:

[0048] Add 50g of octamethylcyclotetrasiloxane, 14.3g of aminopropylmethyldiethoxysilane, 0.20g of dimethylsulfoxide, 0.1g of Potassium, 1.5mL of deionized water; react under nitrogen atmosphere at 90°C for 4 hours, then lower the temperature to 60°C, a...

Embodiment 3

[0059] The preparation method of the double-crosslinked polysiloxane superhydrophobic elastomer of triple repair, the steps are as follows:

[0060] a. Preparation of (2-formylphenylboronic acid) zinc chloride [abbreviated as CHO-Bz]:

[0061] Add 0.45 g of 2-formylphenylboronic acid to a reactor (such as a 50 mL flask, etc.), add 18 mL of ethanol, ultrasonically disperse, add 0.22 g of zinc chloride, and stir (at room temperature) for 22 hours. Ethanol was rotary distilled at a temperature of 40-60° C. to obtain (orange product) (2-formylphenylboronic acid) zinc chloride [abbreviated as CHO-Bz], and set aside;

[0062] b. Preparation of side chain aminated polysiloxane [abbreviated as AP-PDMS]:

[0063] Add 48g of octamethylcyclotetrasiloxane, 13.8g of aminopropylmethyldiethoxysilane, 0.20g of dimethyl sulfoxide, 0.09g of Potassium, 1.3mL of deionized water; react for 5 hours under a nitrogen atmosphere at a temperature of 85°C, then lower the temperature to 55°C, and remov...

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Abstract

The invention discloses a triple-repair double-crosslinked polysiloxane super-hydrophobic elastomer and a preparation method thereof. The preparation method is characterized by comprising the following steps: preparing (2-formylphenylboronic acid) zinc chloride; preparing polysiloxane with a side chain aminated: adding octamethylcyclotetrasiloxane, aminopropyl methyl diethoxy silane, dimethyl sulfoxide, potassium hydroxide and deionized water into a reactor, conducting heating reaction under the nitrogen atmosphere, and then removing small molecules so as to obtain the side-chain aminated polysiloxane; preparing a double-crosslinked polydimethylsiloxane elastomer: taking the side-chain aminated polysiloxane, adding tetrahydrofuran, a glutaraldehyde / tetrahydrofuran solution and (2-formylphenylboronic acid) zinc chloride, dispensing the uniformly mixed solution on a polytetrafluoroethylene plate to form a film, and conducting standing to obtain the double-crosslinked polydimethylsiloxane elastomer; and preparing a mixed solution, spraying the mixed solution on the surface of the double-crosslinked polydimethylsiloxane elastomer, and conducting drying to obtain the triple-repaired bi-crosslinked polysiloxane super-hydrophobic elastomer. The super-hydrophobic elastomer can be used for micro-crack repair of a flexible circuit in a flexible intelligent wearable device.

Description

technical field [0001] The invention belongs to polymer materials and preparation thereof, and relates to double-crosslinked polysiloxane superhydrophobic elastomers for triple repair and a preparation method thereof. The (prepared) double-crosslinked polysiloxane superhydrophobic elastomer [referred to as HB-imine-BZn-PDMS] of the present invention (prepared) is suitable for flexible smart wearable devices such as electronic skins, flexible circuit boards in smart bracelets, etc. It can realize micro-crack repair of flexible circuit, and has good waterproof performance. Background technique [0002] After billions of years of evolution, animals and plants in nature have formed many special structures to adapt to the natural environment, such as: the self-cleaning ability of lotus leaves, the hydrophobic performance of butterfly wings, etc., which attract a large number of people to explore, through The imitation of nature achieves excellent hydrophobic performance by const...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/398C08G77/26C08J3/24C08J5/18C08J7/04C09D183/08C09D7/61C08L83/08
CPCC08G77/398C08G77/26C08J3/243C08J5/18C08J7/0427C09D183/08C09D7/61C09D7/67C08J2383/08C08J2483/08C08K3/36
Inventor 黄亚文单玉兴刘丽莉
Owner SOUTHWEAT UNIV OF SCI & TECH
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