Preparation method of single-component silane-terminated liquid fluorine sealing rubber

A liquid fluororubber and sealant technology, applied in chemical instruments and methods, adhesives, adhesive additives, etc., can solve the problems of unenvironmental protection and high toxicity, and achieve the effect of good low temperature resistance, high cost performance and wide range of materials.

Inactive Publication Date: 2017-11-07
吉林氟瑞恩新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The obtained product can be cured by polyisocyanate. This system is a polyurethane curing system. Generally, it can only be designed as a two-component adhesive, and the polyisocyanate in the system contains NCO groups, which is highly toxic and not environmentally friendly.

Method used

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  • Preparation method of single-component silane-terminated liquid fluorine sealing rubber

Examples

Experimental program
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Effect test

Embodiment 1

[0025] First, carboxyl-terminated liquid fluororubber (carboxyl-terminated poly(vinylidene fluoride-co-tetrafluoroethylene), carboxyl content of 1 wt%, number average molecular weight of 2000) was dissolved in the organic solvent tetrahydrofuran in a 10L glass reactor. The weight ratio of carboxyl-terminated poly(vinylidene fluoride-co-tetrafluoroethylene) to tetrahydrofuran was 1:2, and the dissolution process was carried out at room temperature 23°C; then, 3-(2,3-epoxy Propoxy)propyltrimethoxysilane, the carboxyl group in its carboxyl-terminated poly(vinylidene fluoride-co-tetrafluoroethylene) and the epoxy group in 3-(2,3-glycidoxy)propyltrimethoxysilane The molar ratio is 1:1; Then, add sodium hydroxide catalyst again, the dosage is 0.2wt% of carboxy-terminated poly(vinylidene fluoride-co-tetrafluoroethylene), stir under nitrogen condition, react 4h after stirring, react The temperature is controlled at 50°C; finally, to end the reaction, slowly add hydrochloric acid to th...

Embodiment 2

[0028]First, carboxyl-terminated liquid fluororubber (carboxyl-terminated poly(vinylidene fluoride-co-hexafluoropropylene), carboxyl content of 4 wt%, number average molecular weight of 8000) was dissolved in organic solvent trifluoroacetic acid in a 10L glass reactor , the weight ratio of carboxyl-terminated poly(vinylidene fluoride-co-hexafluoropropylene) to trifluoroacetic acid is 1:5, and the dissolution process is carried out at room temperature 23°C; then, add 2-(3, 4-epoxycyclohexyl)methyltrimethoxysilane, carboxyl group in carboxyl-terminated poly(vinylidene fluoride-co-hexafluoropropylene) and 2-(3,4-epoxycyclohexyl)methyltrimethoxysilane The molar ratio of epoxy group in oxysilane is 1:3; Then, add potassium hydroxide catalyst again, consumption is the 0.2wt% of carboxy-terminated poly(vinylidene fluoride-co-hexafluoropropylene), stir under nitrogen condition React for 8 hours, and the reaction temperature is controlled at 120°C; finally, to end the reaction, slowly ...

Embodiment 3

[0031] First, carboxyl-terminated liquid fluororubber (carboxyl-terminated poly(tetrafluoroethylene-co-hexafluoropropylene), carboxyl content of 3 wt%, number average molecular weight of 6000) was dissolved in organic solvent acetone in a 10L glass reactor. The weight ratio of carboxyl-terminated poly(tetrafluoroethylene-co-hexafluoropropylene) to acetone was 1:3, and the dissolution process was carried out at room temperature 23°C; then, 2-(3,4-epoxy Cyclohexyl)methyltriethoxysilane, carboxyl group in carboxyl-terminated poly(tetrafluoroethylene-co-hexafluoropropylene) and 2-(3,4-epoxycyclohexyl)methyltriethoxy The molar ratio of the epoxy group in the silane is 1:2; Then, add sodium ethylate catalyst again, consumption is the 0.2wt% of carboxyl-terminated poly(tetrafluoroethylene-co-hexafluoropropylene), stir reaction 6h under nitrogen condition, The reaction temperature is controlled at 100°C; finally, to end the reaction, slowly add hydrochloric acid to the reaction system...

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Abstract

The invention discloses a preparation method of a single-component liquid fluorine sealing rubber based on silane-terminated liquid fluororubber. According to the preparation method, carboxyl-terminated liquid fluorubber is taken as an initial raw material, reaction with an epoxy silane compound is carried out at base catalysis so as to obtain silane-terminated liquid fluororubber; the obtained silane-terminated liquid fluororubber is taken as a basic polymer, and a diluent, a cross-linking agent, and a filling material are added so as to obtain the single-component silane-terminated liquid fluorine sealing rubber. The advantages of the preparation method are that: the production technology is simple; the resources of the basic polymer are widely available; requirements of different application fields can be satisfied; and when liquid fluorubber containing ether bonds is taken as the basic polymer, the low temperature resistance is better, the cost performance is higher, no volatile component is contained, and no environment pollution is caused.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a preparation method of a one-component silane-terminated liquid fluorine sealant. Background technique [0002] Fluorine rubber has excellent high temperature resistance and chemical medium resistance, and is widely used in aerospace, petrochemical, automobile and other fields. General-purpose fluororubber is a high-molecular-weight solid polymer with high Mooney viscosity and difficult processing. It is often necessary to add plasticizers to improve processing performance. Since solid fluororubber can only be molded and extruded in the factory to produce parts such as gaskets and sealing rings, it cannot be vulcanized at the construction site like sealants and adhesives, which also limits the application of fluororubber. [0003] The low-molecular-weight liquid fluororubber with reactive end groups has the characteristics of high fluorine content and re-vulcanization after constr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/42C08F214/22C08F214/26C09J127/22C09J183/08C09J11/04C09J11/06C09K3/10
CPCC08F8/42C08K2003/265C08K2201/011C08L2201/08C09J11/04C09J11/06C09J127/22C09K3/10C09K2003/1078C08F214/22C08F214/26C08F214/222C08L83/08C08K3/26C08K3/36
Inventor 张磊栾意
Owner 吉林氟瑞恩新材料科技有限公司
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