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Alkoxy end-capped linear polysiloxane resin acceptor and synthetic method thereof

A polysiloxane coupling agent and alkoxy-terminated technology, which is applied in the field of alkoxy-terminated linear polysiloxane coupling agent and its preparation, can solve the problems of high price, high preparation cost, high reactivity, etc. problem, to achieve good durability, overcome poor heat resistance, and low cost

Inactive Publication Date: 2008-11-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned patent application technology has the following disadvantages: the α, ω-dichloro-1,3,5,7-pentavinyl-1,3,5,7-pentamethylsiloxane molecular weight obtained by the method is low, so Its high temperature resistance is poor, causes its scope of application to be greatly limited, and the reactivity of the monomer raw material methyl vinyl dichlorosilane that this method uses is not as high as the activity of the monomer thionyl chloride adopted in the present invention, and Difunctional methyl vinyl dichlorosilane is prone to isomerization reaction, resulting in low reaction conversion rate. In addition, methyl vinyl dichlorosilane monomer is expensive, so its preparation cost is relatively high

Method used

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  • Alkoxy end-capped linear polysiloxane resin acceptor and synthetic method thereof
  • Alkoxy end-capped linear polysiloxane resin acceptor and synthetic method thereof
  • Alkoxy end-capped linear polysiloxane resin acceptor and synthetic method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In a 250ml three-neck flask equipped with a constant pressure dropping funnel, drying tower, magnetic stirring and heating reflux device, transfer 0.09ml N,N-dimethylformamide, 4.5ml acetonitrile, 6.4ml tetrachloride Si, stir vigorously to mix well. Transfer 77.4ml of octamethylcyclotetrasiloxane to the constant pressure dropping funnel, start adding octamethylcyclotetrasiloxane dropwise when the temperature of the system rises to 30°C, and after constant temperature reaction for 16 hours, distill off the solvent and catalyst under reduced pressure, A monochloro-terminated linear polymethylsiloxane was obtained. The resulting product is a mixture whose structural formula Me 3 Si(OSiMe 2 )n Cl.

[0038] After the above synthesis is completed, use petroleum ether (boiling range 30-60°C) as a solvent, and slowly add excess sodium methoxide-methanol saturated solution and monochlorine-terminated linear polysiloxane dropwise at the same time. After reflux reaction for 5 h...

Embodiment 2

[0041] In a 250ml three-neck flask equipped with a constant pressure dropping funnel, drying tower, magnetic stirring and heating reflux device, transfer 0.71ml N,N-dimethylformamide, 16ml acetonitrile, 14.5ml silicon tetrachloride with a syringe needle , stir vigorously to mix well. Transfer 77.4ml of octamethylcyclotetrasiloxane to the constant pressure dropping funnel, start adding octamethylcyclotetrasiloxane dropwise when the temperature of the system rises to 60°C, and react at constant temperature for 12 hours, distill off the solvent and catalyst under reduced pressure, The α-monochloro-ω-trichloro linear polymethylsiloxane was prepared. The resulting product is a mixture, which is a colorless transparent liquid with a simplified structure of Cl 3 Si(OSiMe 2 ) n Cl.

[0042] After the above synthesis is completed, using petroleum ether (boiling range 30-60°C) as a solvent, slowly add excess sodium ethoxide-ethanol saturated solution and α-monochloro-ω-trichloro lin...

Embodiment 3

[0044] In a 250ml three-necked flask equipped with a constant pressure dropping funnel, a drying tower, a magnetic stirring device, and a heating reflux device, transfer 1.7ml N, N-dimethylformamide, 22.5ml acetonitrile, and 64ml trimethylchlorosilane with a syringe needle. , stir vigorously to mix well. Transfer 64ml of octamethylcyclotetrasiloxane to the constant pressure dropping funnel, start adding octamethylcyclotetrasiloxane dropwise when the temperature of the system reaches 80°C, and react at constant temperature for 8 hours, distill off the solvent and catalyst under reduced pressure to prepare Obtain monochlorine-terminated linear polymethylsiloxane. The resulting product is a mixture, which is a colorless transparent liquid, and its structural formula Me 3 Si(OSiMe 2 ) n Cl.

[0045] After the above synthesis is completed, use petroleum ether (boiling range: 30-60°C) as solvent, and slowly add excess sodium methoxide-methanol saturated solution and monochlorine...

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Abstract

The invention relates to alkoxy end capping linear polysiloxane coupling agent and a synthetic method thereof, including cationic ring-opening reaction of organic silicon epoxy with trimethylchlorosilane or silicon tetrachloride or thionyl chloride to obtain monochloro-end capping linear polysiloxane, Alpha-chloro-Omega-trichloro linear polysiloxane, Alpha, Omega-dichloro linear polysiloxane respectively; then alkoxylated reaction of saturated solution of fatty alcohol sodium-alcohol with the prepared chloro-end capping linear polysiloxane to obtain degree of polymerization controllable alkoxy end capping linear polysiloxane. The polysiloxane has higher reaction activity and can be used in surface treatment and modification of various inorganic materials and organic polymer materials, and has advantages of one agent more performances, combination, synergistic action, low cost, high temperature resistance, non-volatilization and good durability, thus obtaining various modified inorganic fillers and organic polymer materials with excellent performance.

Description

technical field [0001] The invention relates to a novel alkoxy-terminated linear polysiloxane coupling agent and a preparation method thereof. technical background [0002] Coupling agent is a kind of composite system of inorganic materials and polymer materials, which can combine the two through physical and / or chemical action, or can make the affinity of the two get better through physical and / or chemical reactions. It is a substance that improves the comprehensive performance of composite materials. As a key material to improve the performance of polymer composites and reduce costs, coupling agents are widely used in plastics, rubber, glass fiber reinforced plastics, coatings, pigments, papermaking, adhesives, magnetic materials, oilfield chemicals and other industries. With the continuous development of polymer blends and fillers, the demand for new multifunctional coupling agents is more urgent. [0003] The general formula of silane coupling agent is R n SiX (4-n) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/38C08G77/24C08G77/06C08K5/5415C08L83/06C07F7/18
Inventor 章永化黄华鹏张运生石耀刚王建华
Owner SOUTH CHINA UNIV OF TECH
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