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Silicone sealant polymer capable of self-repairing and being recycled by virtue of sunlight as well as preparation method and application of silicone sealant polymer

A technology of silicone glue and polymer, which is applied in the field of green polymer materials, can solve the problems of material macroscopic fracture, fatigue damage, crack expansion, etc., and achieve the effects of short repair time, extended service life and high repair efficiency

Active Publication Date: 2017-01-18
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, during the processing and use of polymer materials, microcracks and local damage will inevitably occur inside them. These microscopic defects are easy to form stress concentration inside the material, so that the material begins to crack under a small force. , resulting in a macroscopic fracture of the material as a whole
Silicone glue used to bond glass will also age, fatigue damage, produce microcracks, and even fail over time

Method used

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  • Silicone sealant polymer capable of self-repairing and being recycled by virtue of sunlight as well as preparation method and application of silicone sealant polymer
  • Silicone sealant polymer capable of self-repairing and being recycled by virtue of sunlight as well as preparation method and application of silicone sealant polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Take the following raw materials in parts by weight: 100 parts of α, ω-dihydroxypolysiloxane with a viscosity of 3000cst, 10 parts of bis-3-(triethoxysilylpropyl)-disulfide, 5 parts of Silicone resin of sulfur bond or tetrasulfide bond, 3 parts of surface modified nano silica (100 parts by weight of nano silicon dioxide, 15 parts by weight of silane coupling agent, 500 parts by weight of ethanol solution, grafting rate of 8%), 3 parts by weight Dibutyltin dilaurate; first the α, ω-dihydroxy polysiloxane with the viscosity of 3000cst is stirred and mixed with surface-modified nano silicon dioxide, silicone resin containing disulfide bonds or tetrasulfide bonds, and then Add bis-3-(triethoxysilylpropyl)-disulfide, stir and mix well, then add dibutyltin dilaurate, stir and mix well, then degas the above mixture under vacuum conditions, and then put it into a container Sealed and stored, it is a silicone rubber prepolymer. After extruding the prepared silicone rubber prepo...

Embodiment 2

[0056] Take the following raw materials in parts by weight: 100 parts of α, ω-dihydroxypolysiloxane with a viscosity of 3000cst, 5 parts of bis-[γ-(triethoxysilyl) propyl] tetrasulfide, 5 parts containing Silicone resin of disulfide bond or tetrasulfide bond, 3 parts of surface modified nano-silica (100 parts by weight of nano-silica, 15 parts by weight of silane coupling agent, 500 parts by weight of ethanol solution, grafting rate of 8%), 3 parts of dibutyltin dilaurate; the α, ω-dihydroxy polysiloxane with the viscosity of 3000cst is stirred and mixed evenly with surface-modified nano silicon dioxide, silicone resin containing disulfide bond or tetrasulfide bond, Then add bis-[γ-(triethoxysilyl)propyl]tetrasulfide and stir to mix evenly, then add dibutyltin dilaurate and stir to mix evenly, then degas the above mixture under vacuum conditions, and then pack Put it into a container and keep it sealed, which is the silicone rubber prepolymer. After the prepared silicone rubb...

Embodiment 3

[0062] Take the following raw materials in parts by weight: 100 parts of α, ω-dihydroxypolysiloxane with a viscosity of 1500cst, 10 parts of bis-3-(triethoxysilanepropyl)-disulfide, 10 parts of Silicone resin with sulfur bond or tetrasulfide bond, 1 part of surface modified nano-silica (100 parts by weight of nano-silica, 10 parts by weight of silane coupling agent, 500 parts by weight of ethanol solution, grafting rate 5%), 5 parts by weight Dibutyltin dilaurate; First, the α, ω-dihydroxy polysiloxane with the viscosity of 1500cst is stirred and mixed with surface-modified nano silicon dioxide, silicone resin containing disulfide bonds or tetrasulfide bonds, and then Add bis-3-(triethoxysilylpropyl)-disulfide, stir and mix well, then add dibutyltin dilaurate, stir and mix well, then degas the above mixture under vacuum conditions, and then put it into a container Sealed and stored, it is a silicone rubber prepolymer. After the prepared silicone rubber prepolymer is extruded,...

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Abstract

The invention belongs to the technical field of green high molecular materials, and particularly discloses a silicone sealant polymer capable of self-repairing and being recycled by virtue of sunlight. The silicone sealant polymer is prepared from the following raw materials in parts by weight: 80-120 parts of hydroxyl polysiloxane, 5-15 parts of a disulfide bond or tetrasulfide bond-containing silane coupling agent, 1-20 parts of disulfide bond or tetrasulfide bond-containing silicone resin, 1-10 parts of surface-modified nano silicon dioxide and 1-5 parts of an organic tin catalyst. During fracture damage of the silicone sealant polymer provided by the invention, by virtue of a photoreversible reaction characteristic of a disulfide bond contained in the silicone sealant, the silicone sealant can be repaired repeatedly under the irradiation of the sunlight, the repairing time is short, the repairing efficiency is high, and the silicone sealant is not deformed after being repaired. After a waste material of the silicone sealant polymer is ground into powder, the waste material can be recycled through mould pressing under the irradiation of the sunlight. The silicone sealant polymer provided by the invention is easy to synthesize; the raw materials are easy to obtain; prolonging of the service life of the silicone sealant is facilitated; a silicone rubber resource is saved; the silicone sealant has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of green polymer materials, and more specifically relates to a silicone rubber polymer which utilizes sunlight for self-repair and recycling and its preparation method and application. Background technique [0002] Silicone glue is an ointment that cures to a tough silicone rubber-like solid material upon exposure to moisture in the air. The cured silicone glue has the advantages of good bonding performance, high mechanical strength, good vibration resistance, moisture resistance, high and low temperature resistance, and weather resistance. In addition, silicone glue has wide applicability and can realize the bonding between most building materials, especially the bonding between glass and aluminum alloys. Therefore, it is widely used in bonding glass, ceramics, etc. Wide range of construction adhesives. [0003] However, during the processing and use of polymer materials, microcracks and local damage will...

Claims

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Application Information

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IPC IPC(8): C08L83/06C08L83/08C08K9/06C08K3/36C08K5/548
CPCC08L83/06C08K2201/011
Inventor 向洪平容敏智章明秋
Owner SUN YAT SEN UNIV
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