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A kind of polycarbonate chain extender and preparation method thereof

A polycarbonate and chain extender technology, used in the field of polyester chain extenders, can solve the problems of limitation and limited overall improvement, and achieve the advantages of improving flexibility, increasing molecular weight and glass transition temperature, and reducing internal stress. Effect

Active Publication Date: 2015-08-26
NINGBO ZHETIE DAPHOON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the introduction of siloxane groups can improve the brittleness of epoxy resin to a certain extent, it is limited by the molecular structure of dichlorosilane used, so that the overall improvement is relatively limited

Method used

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  • A kind of polycarbonate chain extender and preparation method thereof
  • A kind of polycarbonate chain extender and preparation method thereof
  • A kind of polycarbonate chain extender and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Add 1kg of 9,9-bis(4-hydroxyethoxyphenyl)fluorene and 5kg of 1,4-dioxane into the reactor purged with nitrogen, stir at 65°C for 1 hour, and then remove moisture under reduced pressure;

[0031] 2. Add 0.18kg diethyldichlorosilane, feed flow rate 100ml / h, stirring rate 150rpm, react at 70°C for 1.5h, pass nitrogen gas to remove HCl gas, continue to keep warm for 3h, remove HCl gas under reduced pressure, and obtain 9 ,9-bis(4-hydroxyethoxyphenyl)fluorene-diethylsilane-9,9-bis(4-hydroxyethoxyphenyl)fluorene oligomer;

[0032] 3. Add 1.2kg of epichlorohydrin and 40g of tetrabutylammonium bromide into the above reactor, stirring at a rate of 300rpm. After the reactor is warmed up to 65°C, add a total of 0.5kg of 50% NaOH solution. The feed flow rate of 50% NaOH solution is 100ml / h, the feed time is 3h, and the pressure is refluxed at the same time. Cumulative reaction time 4h, vacuum degree 10kPa;

[0033] 4. After the reaction is over, remove the water, epichlorohydr...

Embodiment 2

[0037] The raw material composition and reaction process parameters are shown in Table 1, and the epoxy value of the product obtained is 0.18mol / 100g.

Embodiment 3

[0039] The raw material composition and reaction process parameters are shown in Table 1, and the epoxy value of the product obtained is 0.15mol / 100g.

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Abstract

The invention relates to a PC (polycarbonate) chain extender containing fluorenyl andsilicon-oxygenstructures and a preparation method thereof. 4,4'-(9-fluorenylidene)bis(2-phenoxy-ethanol) and dichlorodiethylsilane have a condensation reaction to prepare an intermediate, and the intermediate and epichlorohydrin have condensation polymerization to prepare the epoxy-group-terminated PCchain extender. According to the PCchain extender and the preparation method thereof, the rigid fluorine rings containing flexible side groups and silicon-oxygen bonds with the excellent flexibility are introduced, and the obtained product can obviously improve the molecular weight and the glass transition temperature of recycled PC materials, increase the melt strength of therecycled PC materials, improve the machine shaping performance, further reduce the internal stress and improve the low-temperature shock resistance and the flame retardation without affecting the transparency.

Description

technical field [0001] The invention relates to a polyester chain extender, in particular to a polycarbonate chain extender containing a fluorenyl group and a silicon-oxygen structure. Background technique [0002] Polycarbonate PC has good comprehensive performance and is widely used in many fields such as electronics, building materials, automobile industry and packaging, but tens of thousands of tons of PC waste is generated every year. For example, through recycling and making full use of PC recycled materials, and developing a plastic circular economy, not only can effectively reduce the burden on the social environment and save resources, but also an inevitable way to achieve sustainable development of the PC industry. However, since PC contains ester bonds that are easily hydrolyzed, after repeated recycling and use, the molecular weight of PC will decrease greatly due to thermal oxygen aging and other reasons, the yellowness index will increase rapidly, the mechanica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F7/18C08L69/00C08K5/5435
Inventor 傅建永于海洋沈曙光邱琪浩王振徐小武何燕峰沈伦锋王晨晔苗发展
Owner NINGBO ZHETIE DAPHOON CHEM