Thermoplastic modified organic silicon material as well as preparation method and application thereof

By in situ photopolymerization of acrylate monomers on the surface of disulfide-bonded silicone polymers in the presence of specific photoinitiators, the problem of difficult reprocessing of waste silicone polymers is solved, thermoplastic modification and efficient recycling are achieved, and it has good tensile strength and industrial application potential.

CN120647853APending Publication Date: 2025-09-16GUANGDONG UNIV OF TECH
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Patent Information

Application Number
CN202510725993.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-30
Publication Date
2025-09-16

AI Technical Summary

Technical Problem

Waste thermosetting silicone polymers are difficult to melt and reprocess due to their three-dimensional covalent cross-linked structure, making them difficult to recycle. Existing technologies cannot achieve their thermoplastic modification.

Method used

In the presence of specific photoinitiators, acrylate monomers undergo in-situ photopolymerization on the surface of disulfide-containing silicone polymers to form thermoplastic modified silicone materials. The cleavage of disulfide bonds and the coating of acrylate monomers give the material thermoplasticity and good tensile strength.

Benefits of technology

Thermoplastic modification of waste silicone polymers is achieved, the preparation process is mild, energy consumption is low, it is suitable for recycling, and it has good tensile strength and industrial application prospects.

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Abstract

The invention relates to a thermoplastic modified organic silicon material as well as a preparation method and application thereof, and the thermoplastic modified organic silicon material comprises the following raw material components in parts by weight: 10-15 parts of an organic silicon polymer containing disulfide bonds, 40-70 parts of an acrylate monomer and 0.5-1.5 parts of a photoinitiator, the disulfide bond-containing organosilicon polymer is obtained by reacting a disulfide bond-containing silane coupling agent with an organosilicon polymer, and the mass ratio of the disulfide bond-containing silane coupling agent to the organosilicon polymer is 1: (1.6-2); the photoinitiator is at least one of 2-hydroxy-2-methyl-1-phenyl-1-acetone or 2-hydroxy-4 '-(2-hydroxyethoxy)-2-methyl propiophenone, and the photoinitiator is at least one of 2-hydroxy-2-methyl-1-phenyl-1-acetone and 2-hydroxy-4'-(2-hydroxyethoxy)-2-methyl propiophenone. In the presence of a specific photoinitiator, an acrylate monomer is subjected to an in-situ photopolymerization reaction on the surface of the organosilicon polymer containing disulfide bonds, so that the thermoplastic modified organosilicon material has thermoplastic capability.
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Claims

1. A thermoplastic modified silicone material, characterized in that: The thermoplastic modified silicone material comprises the following raw material components by weight: 10 to 15 parts of silicone polymer containing disulfide bonds, 40 to 70 parts of acrylate monomers, and 0.5 to 1.5 parts of photoinitiator; The disulfide bond-containing organosilicon polymer is obtained by reacting a disulfide bond-containing silane coupling agent with an organosilicon polymer, and the mass ratio of the disulfide bond-containing silane coupling agent to the organosilicon polymer is 1:(1.6-2); The photoinitiator is at least one of 2-hydroxy-2-methyl-1-phenyl-1-propanone and 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone.

2. The thermoplastic modified silicone material according to claim 1, characterized in that: The mass ratio of the disulfide bond-containing silicone polymer to the acrylic ester monomer is 1:(4-7).

3. The thermoplastic modified silicone material according to claim 1, characterized in that: The reaction process is: grafting the disulfide bond-containing silane coupling agent onto the organic silicon polymer through a hydrolysis condensation reaction.

4. The thermoplastic modified silicone material according to claim 1, characterized in that: The acrylic acid ester monomer is a monofunctional acrylic acid ester monomer.

5. The thermoplastic modified silicone material according to claim 1, characterized in that: The disulfide bond-containing silane coupling agent is bis-[3-(triethoxysilyl)-propyl]-disulfide.

6. A method for preparing the thermoplastic modified silicone material according to any one of claims 1 to 5, characterized in that: The following steps are involved: The thermoplastic modified silicone material is obtained by mixing a disulfide bond-containing silicone polymer, an acrylate monomer and a photoinitiator and performing an in-situ photopolymerization reaction.

7. The preparation method according to claim 6, wherein: The illumination time in the photopolymerization reaction is 5 to 90 minutes.

8. The preparation method according to claim 6, characterized in that: The light intensity in the photopolymerization reaction is 1 to 7 mW / cm 2 .

9. The preparation method according to claim 6, characterized in that: The temperature of the photopolymerization reaction is 20-35°C.

10. Use of the thermoplastic modified silicone material according to any one of claims 1 to 5 in the preparation of thermoplastic parts.