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Synthesis process for polycarbonate with super high molecular weight

An ultra-high molecular weight, polycarbonate technology, applied in the field of organic high polymer preparation, can solve the problems of inability to carry out industrial production, the content cannot be too high, and the pretreatment procedure is long, and achieves convenient industrial production, simple reaction process, Avoid the effects of the use of phosgene

Inactive Publication Date: 2005-04-06
HEFEI UNIV OF TECH
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Problems solved by technology

[0009] However, because the reaction requires the separation of high-purity cyclic oligomers, the degree of polymerization must not exceed five, and the content of three, four, and pentamers should not be too high. Industrial production

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  • Synthesis process for polycarbonate with super high molecular weight

Examples

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Embodiment Construction

[0027] Non-limiting examples are described as follows:

[0028] 1. Add 20.326 grams of bisphenol A, 3.265 grams of sodium bisulfite, and 100 milliliters of 10% sodium hydroxide aqueous solution to a 250-milliliter four-neck flask equipped with a stirrer, a condenser, a dropping funnel, and a thermometer. Stir until the bisphenol A is completely dissolved, then maintain the temperature at 30-37°C, and start to add a saturated solution of triphosgene in methylene chloride (containing 9.881 g of triphosgene) dropwise. After about one hour, the addition of triphosgene is completed, and then add The phase transfer agent, tertiary amine, chain extender and 10 ml of 25% NaOH solution were reacted for another 2.5 hours, washed repeatedly with deionized water until the aqueous phase contained no chloride ions, added acetone and stirred quickly, and the precipitate was separated. The viscosity molecular weight of the product is 84033, and the yield is 98.4% based on bisphenol A, and 87....

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Abstract

This invention discloses a synthetic method of extra high molecular weight polycarbonate. Materials are three phosgene and bisphenol A, it includes condensation polymerization, washing, sedimentation and separating each unit processes. The condensation polymerization is that soduim salt water solution of bisphenol an or its soduim salt solid is proceeded liquid-liquid two-phase polycondensation or solid-liquid two-phase suspension polycondensation 3-5 hours under temperature 20-450C with dichloromethane solution of three phosgene with phase transfer catalyst and tertiary amine and spreading agent. The mole ratio of bisphenol an and three phosgene is 1:0.3-0.5. Viscosity-average molecular weight of polycarbonate >70,000, yield that count by bisphenol A >= 98% and by three phosgene >= 85%. The reaction is milden, smooth and is reacted at normal temperature and normal pressure, and operation and control is simple, security is high, and it is appropriate to industrial production.

Description

1. Technical field [0001] The invention relates to a method for preparing an organic high polymer, specifically a method for synthesizing ultrahigh molecular weight polycarbonate. 2. Background technology [0002] Ultra-high molecular weight polycarbonate generally refers to polycarbonate with a viscosity average molecular weight of more than 70,000 or a weight average molecular weight of more than 100,000. It is a functional polycarbonate with excellent impact resistance and strength. The field of impact performance is used. [0003] In order to obtain high-quality or polycarbonate with special functions, many new synthesis methods and process technologies have been selected. The wet phosgene synthesis polycarbonate process proposed by Japan's Mitsubishi Gas Chemical [Japanese Open Patent JP10 212 346 (1998)]: dissolve bisphenol A in NaOH aqueous solution containing sulfite, add CH 2 Cl 2 Pass through phosgene again, then add nonylphenol polyethoxy ether surfactant to em...

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Application Information

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IPC IPC(8): C08G64/00
Inventor 姚日生豆海华尤亚华邓胜松张洪斌方世东
Owner HEFEI UNIV OF TECH
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