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Reactive organic silicon release agent and preparation method thereof

An organosilicon and mold release agent technology, applied in coating and other directions, can solve the problems of large workload of polishing and grinding work, affecting production efficiency, etc., and achieve the effect of increasing recycling rate, improving quality, and improving storage stability.

Active Publication Date: 2021-05-25
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For products with complex shapes or large sizes, the workload of polishing and grinding is huge, which seriously affects production efficiency

Method used

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  • Reactive organic silicon release agent and preparation method thereof
  • Reactive organic silicon release agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1) Epoxy-terminated dimethylpolysiloxane resin (resin 1, molecular weight 500000-1000000 g / mol) and diethanolamine are fed in a molar ratio of 1:4, then excess chloroform is added, and the reaction is carried out at room temperature for 12 Hour. Then precipitate in methanol and dry to obtain hydroxydimethylpolysiloxane resin.

[0032] 2) Hydroxydimethylpolysiloxane resin and 4-mercaptobutyric acid are fed in a molar ratio of 1:9, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 4-Dimethylaminopyridine was used as a catalyst (the molar ratio of the two was 10:1), and excess chloroform was used as a solvent, and the reaction was carried out at room temperature for 24 hours. Then wash with water, wash with 5% sodium bicarbonate aqueous solution, and dry. After removing chloroform with a rotary evaporator, dry in a vacuum oven at 30°C for 24 hours to obtain a mercapto-terminated dimethyl polysiloxane.

[0033] 3) Add 20 parts of mercaptopolysiloxane, 0....

Embodiment 2

[0035] 1) Epoxy-terminated dimethylpolysiloxane resin (resin 2, molecular weight 20000-50000 g / mol) and diethanolamine are fed in a molar ratio of 1:2, then excess chloroform is added, and the reaction is carried out at room temperature for 24 Hour. Then precipitate in methanol and dry to obtain hydroxydimethylpolysiloxane resin.

[0036]2) Hydroxydimethylsiloxane resin and 3-mercaptopropionic acid are fed in a molar ratio of 1:2, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 4 -Dimethylaminopyridine was used as a catalyst (the molar ratio of the two was 10:1), and excess chloroform was used as a solvent, and the reaction was carried out at room temperature for 24 hours. Then wash with water, wash with 5% aqueous sodium bicarbonate solution, and dry. After removing chloroform with a rotary evaporator, dry in a vacuum oven at 30°C for 24 hours to obtain a mercapto-terminated dimethyl polysiloxane resin.

[0037] 3) Add 30 parts of mercapto polysiloxane, ...

Embodiment 3

[0039] 1) Epoxy-terminated diphenyldimethylsiloxane resin (resin 3, molecular weight 2000-4000 g / mol) and diethanolamine are fed in a molar ratio of 1:3, then excess chloroform is added, and at room temperature, React for 2 hours. Then precipitate in methanol and dry to obtain hydroxydiphenyldimethylsiloxane resin.

[0040] 2) Hydroxydiphenyldimethylsiloxane resin and 6-mercaptocaproic acid are fed in a molar ratio of 1:4, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloric acid is used to Salt and 4-dimethylaminopyridine were used as catalysts (the molar ratio of the two was 10:1), and excess chloroform was used as solvent, and the reaction was carried out at room temperature for 12 hours. Then wash with water, wash with 5% sodium bicarbonate aqueous solution, and dry. After removing chloroform with a rotary evaporator, dry in a vacuum oven at 30°C for 24 hours to obtain a mercapto-terminated diphenyldimethylsiloxane resin.

[0041] 3) Add 25 parts of mercapto po...

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Abstract

The invention discloses a reactive organic silicon release agent and a preparation method thereof, and belongs to the field of functional additives of high polymer materials. The reactive organic silicon release agent is prepared from sulfydryl polysiloxane, vinyl polysilsesquioxane, an organic solvent, an initiator and the like, and is suitable for medium and high temperature forming processes of composite materials. According to the release agent, in the composite material forming process, polysiloxane is subjected to a cross-linking reaction, and a complete, uniform and high-strength release layer is formed. The release agent is high in release capacity, resistant to abrasion, free of corrosion to a mold and free of influence on the subsequent painting or electroplating procedure of a product.

Description

technical field [0001] The invention belongs to the technical field of composite material processing, and in particular relates to a reactive organic silicon release agent and a preparation method thereof. Background technique [0002] The release agent has a low surface tension and forms a complete coating to act on the surface of two sticky objects, such as the interface between a metal mold and a resin-based composite product, making the surface of the composite product smooth and easy to release. Assist in the completion of the entire product molding process. In terms of the physical properties of the release material, low surface tension and chemical inertness are required. agent, etc.) incompatibility to ensure that the product can be successfully detached from the mold surface; in terms of mechanical properties, the strength of the release layer is required to be as high as possible in order to reduce the wear of the release layer during the demoulding process and im...

Claims

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Application Information

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IPC IPC(8): C08G77/44C08G77/392C09D183/10
CPCC08G77/44C08G77/392C09D183/10
Inventor 郑耀臣徐汇张新涛高正国王宋琦张文杰
Owner YANTAI UNIV
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