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A kind of photoreversible crosslinking organosilicon resin and preparation method thereof

A technology of cross-linking silicone and silicone, which is applied in the field of photoreversible cross-linking silicone resin and its preparation, can solve the problems of difficult natural decomposition and failure of resource recycling of silicone resin, and achieve excellent processing suitability Effect

Active Publication Date: 2019-03-19
MINJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the excellent thermo-oxidative stability and anti-mold performance of silicone resin make it difficult to decompose naturally
At present, some silicone resins can be recycled as toughening modifiers for other resins, but most silicone resins have not been recycled.

Method used

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  • A kind of photoreversible crosslinking organosilicon resin and preparation method thereof
  • A kind of photoreversible crosslinking organosilicon resin and preparation method thereof
  • A kind of photoreversible crosslinking organosilicon resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Mix amino-terminated silicone oil and cinnamoyl chloride at a mass ratio of 100:20, dissolve in γ-aminopropyltriethoxysilane (3wt% of the mass of the mixture), add 5wt‰ of 4-dimethylaminopyridine as a catalyst , react at 30°C for 24h, and then add excess acetone to precipitate a photoreversible cross-linked silicone resin. The photoreversible cross-linking silicone resin film is molded at 80°C by a flat vulcanizing machine, and realizes photo-induced cross-linking under 356nm ultraviolet light irradiation and photo-induced decomposition under 250nm ultraviolet light irradiation. crosslinking.

Embodiment 2

[0023] Mix epoxy-terminated silicone oil and 6,7-dihydroxycoumarin at a mass ratio of 100:30, dissolve in γ-(2,3-epoxypropoxy)propyltrimethoxysilane (the amount is 1% of the mass of the mixture) 5wt%), adding 10wt‰ of boron trifluoride as a catalyst, and performing a ring-opening reaction at 150°C for 24 hours to obtain a photoreversible cross-linked silicone resin. The photoreversible crosslinking silicone resin can be molded by stereolithography (SLA) process technology at 80°C, and realizes photocrosslinking under 356nm ultraviolet light irradiation and photodecrosslinking under 250nm ultraviolet light irradiation. couplet.

Embodiment 3

[0025] Dissolve epoxy-terminated silicone oil and 7-amino-4-methylcoumarin in γ-(2,3-epoxypropoxy)propyltrimethoxysilane with a mass ratio of 100 / 40 (the amount is 1% of the mixture mass 3wt%), add 5wt‰ of sodium ethylate as a catalyst, and react at 80°C for 12h to obtain a photoreversible cross-linked silicone resin. The photoreversible cross-linking silicone resin can be formed by stereolithography (SLA) process technology at 90°C, and realizes photo-crosslinking under 356nm ultraviolet light irradiation and photo-decrosslinking under 250nm ultraviolet light irradiation. couplet.

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Abstract

The invention relates to photoreversible-crosslinking organic silicon resin and a preparation method thereof. The preparation method comprises the following steps: mixing organic silicon prepolymer and a compound containing light-reversible crosslinking groups according to a mass ratio of (100 to 1) to (100 to 30), dissolving in a diluent, then adding 0.05 to 1 weight percent of catalyst, reactingfor 0.1 to 24 hours; adding excessive acetone into a reaction system to separate out a product, using acetone to extract the product for 24 hours, and obtaining the photoreversible-crosslinking organic silicon resin. The photoreversible-crosslinking organic silicon resin and the preparation method have the beneficial effects that due to introduction of the photoreversible-crosslinking groups, thereversible-crosslinking functionalization of the organic silicon resin under the irradiation of transformed light is realized; simultaneously, the photoreversible-crosslinking organic silicon resin can be formed by processing means such as an additive manufacturing technology and mold pressing and the like.

Description

technical field [0001] The invention belongs to the field of recycling of silicone resins, and in particular relates to a photoreversible crosslinking silicone resin and a preparation method thereof. Background technique [0002] Silicone resin has excellent light transmittance, thermal oxidation stability, electrical insulation performance, weather resistance, anti-mold, biocompatibility and other characteristics, and can be widely used as sol, solar energy packaging film, lens, etc. Industry, new energy and other fields play a vital role. However, the excellent thermo-oxidative stability and anti-mold properties of silicone resin make it difficult to decompose naturally. At present, some silicone resins can be recycled as toughening modifiers for other resins, but most silicone resins have not been recycled. In view of this, it is an urgent technical problem to provide a zero-pollution recycling method for silicone resin. Contents of the invention [0003] The object ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/385C08G77/38C08G77/388
CPCC08G77/38C08G77/385C08G77/388
Inventor 薛涵与方润李心忠林棋
Owner MINJIANG UNIV
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