Solvent-resistant polydimethylsiloxane polymer having oil repellency, and production method thereof

A technology of dimethyl siloxane and polymer, applied in the direction of coating, etc., can solve problems such as difficult molding and duplication of basic materials

Inactive Publication Date: 2020-03-03
香港城市大学深圳研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for those surface modification or paint development based on polymer brushes, complex modification processes are often required, and this strategy is difficult to use to develop base materials for molding and replication.

Method used

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  • Solvent-resistant polydimethylsiloxane polymer having oil repellency, and production method thereof
  • Solvent-resistant polydimethylsiloxane polymer having oil repellency, and production method thereof
  • Solvent-resistant polydimethylsiloxane polymer having oil repellency, and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] Example 1. Preparation of crosslinked polydimethylsiloxane polymers from bis-triethoxypolydimethylsiloxane oligomers

[0108] Such as figure 1 As shown, polydimethylsiloxane with high crosslink density was prepared by polycondensation of bis-triethoxypolydimethylsiloxane oligomer (100% by weight BtE-PDMS oligomer) following the aforementioned procedure. oxane. figure 1 showed the preparation of oil-repellent polydimethylsiloxane coatings by polycondensation of BtE-PDMS oligomers.

Embodiment 2

[0109] Example 2. Adjustment of crosslink density and its effect on mechanical strength, swelling rate and surface oil repellency of polymer

[0110] The crosslink density of polydimethylsiloxane polymers from BtE-PDMS oligomers can be adjusted by selecting (1) (SiMe 2 -O) repeating units (to generate PDMS backbones of different molecular weights), (2) addition of BtE-PDMS oligomers to PDMS oligomers with less reactive moieties for modulation.

[0111] (1) if figure 2 As shown in (a), cross-linked polydimethylsiloxane polymers were fabricated using BtE-PDMS oligomers with PDMS backbones with molecular weights of 800, 3000, and 5000 following the aforementioned procedure.

[0112] As a proof of concept, the figure 2 The effect of the molecular weight of the PDMS backbone on the mechanical strength, swelling ratio and surface oil repellency of polydimethylsiloxane polymers made from BtE-PDMS is shown in . BtE-PDMS oligomers with PDMS backbones with molecular weights of 800,...

Embodiment 3

[0116] Example 3. Solvent Resistance of Crosslinked Dimethicone Polymers

[0117] The solvent resistance of cross-linked polydimethylsiloxane polymers can be visualized by dropping droplets of dyed solvent onto polymer films and then imaging the droplet contours after a period of time.

[0118] The crosslinked polydimethylsiloxane polymer prepared in Example 2 was used. Figure 4 A comparison of the toluene resistance of polymers with different degrees of crosslinking is shown. Confocal micrograph showing a longitudinal scan of a stained drop of toluene on a polymer surface. The upper left picture shows a cross-linked polydimethylsiloxane polymer made of pure BtE-PDMS (0 wt% BE-PDMS), the fluorescently dyed toluene droplets are completely outside the polymer and cannot enter the polymer bulk phase, Exhibits good solvent resistance properties; top right, cross-linked polydimethylsiloxane polymer fabricated from BtE-PDMS and BE-PDMS oligomers with 60 wt% BE-PDMS, fluorescently...

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Abstract

The present invention provides a solvent-resistant polydimethylsiloxane polymer having oil repellency, and a production method thereof, wherein the polymer is prepared by curing a viscous fluid mixture through chemical cross-linking, the viscous fluid mixture is formed from a cross-linkable precursor having a formula comprising a reactive molecule and one or a plurality of optional solid or liquidadditives, and the reactive molecule comprises a dimethylsiloxane main chain and one or a plurality of side chain reactive silane motifs.

Description

technical field [0001] The present invention relates to a solvent-resistant and oil-repellent polydimethylsiloxane polymer, more specifically, a polydimethylsiloxane polymer composed of a dimethylsiloxane backbone and one or more side chain reactive silane elements. Reactive molecules formed from polydimethylsiloxane polymers. Background technique [0002] Solvent-resistant polymers with improved oil repellency are of technological importance in fields ranging from construction to electronics and medical devices 1,2 . There is a growing demand for self-cleaning and easy-cleaning coatings on optics, windows and solar panels, stain-resistant pipes, cartridges and coating applications on medical devices 3,4 . Furthermore, oil-repellent materials are highly favored in the microfabrication of micro / nanoscale structures for shaping, replication, and material fabrication using organic precursors 5,6 . [0003] Fluorinated polymers are currently the main choice for developing c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/04C08G77/06C09D183/04
CPCC08G77/04C08G77/06C09D183/04
Inventor 姚希刘鹏
Owner 香港城市大学深圳研究院
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