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Method for preparing crosslinked aliphatic series polycarbonate

A technology of polycarbonate and cross-linking method, which is applied in the field of preparation of cross-linked aliphatic polycarbonate, can solve the problems of low thermal decomposition temperature of PPC, viscous flow, and affecting the processing performance of materials, so as to improve heat resistance and Mechanical properties, overcoming viscous flow phenomena, and the effect of solving viscous flow problems

Active Publication Date: 2006-05-24
迁安市宏奥低碳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Carbon dioxide and propylene oxide copolymer (PPC) has excellent barrier properties and can be printed and heat-sealed, but PPC is prone to viscous flow at room temperature, which seriously affects the storage, transportation and use of materials, and the thermal decomposition temperature of PPC Low, affecting the processing performance of the material
So far, there is no report on the preparation of cross-linked aliphatic polycarbonate by cross-linking side chain double bonds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] After mixing 185ml of propylene oxide and 15ml of allyl glycidyl ether, they were introduced into a reaction kettle full of carbon dioxide under anaerobic conditions, and the rare earth three-way catalyst was added immediately, and the pressure in the kettle was maintained at 35 atmospheres. Polymerization was carried out at 70° C. for 10 hours to obtain 101 g of white polycarbonate. The number average molecular weight of the polymer is 129,000, and each Kg polycarbonate side chain contains 0.36 mol of double bonds. 40 g of this polycarbonate and 1.2 g of 1-hydroxy-cyclohexyl-phenyl ketone were banbury-kneaded at 140° C. for 5 minutes. The mixed resin was thermocompressed on a flat vulcanizing machine at 140° C. for 5 minutes to obtain a sheet with a thickness of 0.5 mm. The obtained sheet was irradiated under a 1000W high-pressure mercury lamp for 4 minutes to obtain a cross-linked aliphatic polycarbonate.

[0020] Its tensile strength is 41.1MPa, elongation at break...

Embodiment 2

[0022] After mixing 190ml of propylene oxide and 10ml of allyl glycidyl ether, they were introduced into a reaction kettle filled with carbon dioxide under anaerobic conditions, and the rare earth three-way catalyst was added immediately, and the pressure in the kettle was maintained at 40 atmospheres. Polymerized at 65°C for 8 hours to obtain 77 g of white polycarbonate. The number average molecular weight of the polymer is 112,000, and each Kg polycarbonate side chain contains 0.24 mol of double bonds. 40 g of this polycarbonate and 1.2 g of 2,4,6 (trimethylbenzoyl)diphenylphosphine oxide were banbury kneaded at 140° C. for 5 minutes. The mixed resin was thermocompressed on a flat vulcanizing machine at 140° C. for 5 minutes to obtain a sheet with a thickness of 0.5 mm. The obtained sheet was irradiated under a 1000W high-pressure mercury lamp for 4 minutes to obtain a cross-linked aliphatic polycarbonate.

[0023] Its tensile strength is 39.5 MPa, elongation at break is 3...

Embodiment 3

[0025] After mixing 196ml of propylene oxide and 4ml of allyl glycidyl ester, they were introduced into a reaction kettle full of carbon dioxide under anaerobic conditions, and the rare earth three-way catalyst was added immediately, and the pressure in the kettle was maintained at 50 atmospheres. Polymerize at 50°C for 20 hours to obtain 81 g of white polycarbonate. The number average molecular weight of the polymer is 156,000, and each Kg polycarbonate side chain contains 0.15 mol of double bonds. 5 g of this polycarbonate and 0.25 g of benzophenone were dissolved in methylene chloride, and a film having a thickness of about 20 μm was obtained by solution casting. After the prepared film was irradiated for 15 minutes under a 500W high-pressure mercury lamp, a cross-linked aliphatic polycarbonate was obtained.

[0026] Its tensile strength is 38MPa, its elongation at break is 35.9%, its permanent deformation is 13% at 60°C, its thermal decomposition temperature is 196°C, and...

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Abstract

The invention belongs to cross-linking type aliphatics polycarbonate preparation method. The method is used containing double bond epoxy compound, epoxy propane, and carbon dioxide ternary polymerization to make polycarbonate with side chain double bond and cross linking type polycarbonate by the cross linking of the side chain double bond. Compare with the non cross-linking polycarbonate, the heat resistance and mechanical property of the ternary polymerization carbonate is improved obviously after cross- linking. The copolymer not only will not be viscous flow at room temperature, but also can be long time use under 60 centigrade degree.

Description

technical field [0001] The invention belongs to the preparation method of cross-linked aliphatic polycarbonate. Background technique [0002] Carbon dioxide and propylene oxide copolymer (PPC) has excellent barrier properties and can be printed and heat-sealed, but PPC is prone to viscous flow at room temperature, which seriously affects the storage, transportation and use of materials, and the thermal decomposition temperature of PPC Low, affecting the processing performance of the material. [0003] In order to improve the performance of PPC, Robeson etc. blended PPC with polyvinyl acetate (PVAC), which made the strength of the blend several times higher than that of PPC (US4912149). Chinese patent 1371942A uses PPC and poly 3-hydroxyalkanoate to blend, and the obtained blend has better biodegradability and mechanical properties. Chinese patent 1058408 adopts the blending of PPC and nitrile rubber. Although the resulting blends have good mechanical properties, they lose...

Claims

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Application Information

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IPC IPC(8): C08G64/02C08J3/24C08J5/18
Inventor 赵晓江陶友华王献红王佛松
Owner 迁安市宏奥低碳科技有限公司
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