Multiple functionality degree polysiloxane coupling agent and preparation method thereof

A polysiloxane coupling agent and a multifunctional technology, which is applied in the field of polyfunctional polysiloxane coupling agent and its preparation, can solve the problems of poor bonding effect of the coupling agent, and achieve good surface treatment effect. simple craftsmanship

Inactive Publication Date: 2008-09-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bonding ability of silane coupling agent increases with the increase of hydrolyzed groups, so the bonding effect of this coupling agent will not be as good as that of a coupling agent containing three hydrolyzed groups in one chain link.

Method used

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  • Multiple functionality degree polysiloxane coupling agent and preparation method thereof
  • Multiple functionality degree polysiloxane coupling agent and preparation method thereof
  • Multiple functionality degree polysiloxane coupling agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]In a 500ml three-necked flask equipped with a reflux device and a drying device, add 60 grams (0.01mol) of dry polymethylhydrogensiloxane (Mn=6000, Xn=100) and dry 100 grams of toluene, and then add 0.067 Grams of [Pt(C 2 h 2 ) 2 Cl 2 ] 2 , 73 g (0.5 mol) of vinyltrimethoxysilane was added dropwise, and reacted at 100° C. for 10 hours to obtain a colorless transparent solution. The transparent solution was distilled under reduced pressure to obtain a polysiloxane coupling agent product, and after hydrogen 1 H nuclear magnetic resonance spectrum characterization (chemical shift: 4.7ppm, 3.54ppm, 1.08ppm, 0.55ppm, 0.18ppm, 0.10ppm), its structure is as follows:

[0029]

[0030] Accompanying drawing is the thermal weight loss figure of this coupling agent in nitrogen atmosphere. It can be known that the starting decomposition temperature of this coupling agent is 303°C; at 800°C, the mass retention rate is 17.4%. It can be seen that the coupling agent prepared by...

Embodiment 2

[0032] In the 500ml three-neck flask equipped with reflux device and drying device, add 86 grams (0.01mol) of dry polymethylvinylsiloxane (Mn is about 8600, Xn=100) and dry 100 grams of n-hexane, Then add 0.10 g of H 2 PtCl 6 ·6H 2 O isopropanol solution (mass concentration: 2%), 49.20 g (0.3 mol) of triethoxyhydrosilane was added dropwise, and reacted at 50° C. for 8 hours to obtain a colorless transparent solution. The transparent solution was distilled under reduced pressure to obtain a polysiloxane coupling agent product, and after hydrogen 1 H NMR spectrum characterization, its structure is as follows:

[0033]

Embodiment 3

[0035] In a 250ml three-necked flask equipped with a reflux device and a drying device, add 66.6 grams (0.01mol) of dry vinyl-terminated polydimethylsiloxane (Mn about 6660, Xn=90) and dry 50 grams of n-hexane , followed by adding 3.28 grams of triethoxyhydrosilane (0.02mol) and 0.07 grams of [Pt(C 2 h 2 ) 2 Cl 2 ] 2 , and reacted at 60°C for 8 hours to obtain a colorless and transparent solution. The transparent solution was distilled under reduced pressure to obtain a polysiloxane coupling agent product, and after hydrogen 1 H NMR spectrum characterization, its structure is as follows:

[0036]

[0037] The polyfunctionality polysiloxane prepared in this embodiment, because the end group contains three alkoxy groups, so the surface treatment effect on the inorganic powder filler is better than that of the polyfunctional polysiloxane prepared by the patent application CN1165533 with only one alkoxy group per chain segment. Polysiloxane has a better surface treatment ...

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Abstract

The invention discloses a multi-functionality polysiloxane coupling agent and a preparation method thereof. The preparation method, inside a system of weak polar solvent and under the action of platinum group catalyst, synthesizes the multi-functionality polysiloxane coupling agent at 50 to 120 DEG C by means of the silicon-hydrogen addition reaction between polysiloxane and trialkoxysilane through side group functional group or end group functional group; and the ratio between the mole numbers of the carbon-carbon double bond or the silicon-hydrogen bond in the polysiloxane and the mole number of the silicon-hydrogen bond or the carbon-carbon double bond in the trialkoxysilane ranges between 50:1 and 1:1. Each chain link of the multi-functionality polysiloxane comprises three alkoxyl groups or each end group contains three alkoxyl groups; therefore, the multi-functionality polysiloxane has better effect on the surface treatment of inorganic powder filler than multi-functionality polysiloxane of which each chain link only has one alkoxyl group; moreover, the heat resistance of the obtained multi-functionality polysiloxane is higher than that of the prior long-chain polyether-type silicane coupling agent.

Description

technical field [0001] The invention relates to a coupling agent for treating inorganic powder fillers, in particular to a multifunctional polysiloxane coupling agent and a preparation method thereof. Background technique [0002] In recent years, silane coupling agents have been widely used in many fields. For example, it is used as a cross-linking curing agent for non-cross-linked polymer systems to achieve room temperature curing; it is used for surface modification of materials to impart anti-static, anti-mildew, deodorant, anti-coagulation and physiological inert properties; it is used for heterogeneous substrates The elastic bridging agent between the two, that is, to improve the adhesion between the two materials with different chemical properties, to achieve the purpose of improving the comprehensive properties of the product such as mechanical, electrical insulation, anti-aging and water repellency. The traditional silane coupling agent is a small molecular chain, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/38C09C3/12
Inventor 章永化张运生黄华鹏石耀刚王建华
Owner SOUTH CHINA UNIV OF TECH
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