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Modified poly (propylene carbonate) and preparation method thereof

A polypropylene carbonate and modification technology, applied in the field of modified polypropylene carbonate and its preparation, can solve the problems of low tensile elongation at break, limited application and the like

Active Publication Date: 2013-03-13
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] After the modification of PPC by the above method, although the thermal stability of polypropylene carbonate is improved, its tensile elongation at break is low, which limits its application in the field of film and sheet

Method used

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  • Modified poly (propylene carbonate) and preparation method thereof
  • Modified poly (propylene carbonate) and preparation method thereof
  • Modified poly (propylene carbonate) and preparation method thereof

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preparation example Construction

[0030] The present invention also provides a kind of modified polypropylene carbonate and preparation method thereof, comprising the following steps:

[0031] (A) Blending polypropylene carbonate and polyphenylpolymethylene polyisocyanate, extruding to obtain crosslinked polypropylene carbonate; the polypropylene carbonate and polyphenylpolymethylene polyisocyanate The mass ratio is 100: (0.1~2);

[0032] (B) Blend the cross-linked polypropylene carbonate with poly(1,2-trimethylene adipate) and extrude to obtain modified polypropylene carbonate; the cross-linked polypropylene carbonate and polyethylene adipate The mass ratio of acid 1,2-propylene glycol ester is 100: (5~20).

[0033] In the present invention, poly(propylene carbonate) is modified by polyphenyl polymethylene polyisocyanate and poly(1,2-trimethylene adipate).

[0034] The number average molecular weight of the polypropylene carbonate is preferably 3×10 4 ~1.5×10 5 Daltons, more preferably 6 x 10 4 ~1×10 5 ...

Embodiment 1

[0042] Take the following components by weight:

[0043] Polypropylene carbonate 1000g

[0044] Polyphenylpolymethylene polyisocyanate 1g

[0045] 50 g of 1,2-trimethylene adipate having a number average molecular weight of 800.

[0046] Add the above polypropylene carbonate into the mixer, add polyphenyl polymethylene polyisocyanate in the stirring state, set the temperature of the first zone of the extruder to 120°C, the temperature of the second zone to 130°C, and the temperature of the third zone to 140°C , the temperature of the fourth zone is 140°C, the temperature of the fifth zone is 140°C, the temperature of the sixth zone is 150°C, the temperature of the seventh zone is 150°C, the temperature of the eighth zone is 150°C, the temperature of the head is 145°C, and the screw speed is set to 100 rpm / min, cross-linked polypropylene carbonate is obtained after extrusion, water-cooling, stretching and granulation. The tensile strength, glass transition temperature, ther...

Embodiment 2

[0049] Take the following components by weight:

[0050] Polypropylene carbonate 1000g

[0051] Polyphenylpolymethylene polyisocyanate 3g

[0052] 50g of poly(1,2-trimethylene adipate) with a number average molecular weight of 3000

[0053] Add the above polypropylene carbonate into the mixer, add polyphenyl polymethylene polyisocyanate in the stirring state, set the temperature of the first zone of the extruder to 125, the temperature of the second zone to 135°C, and the temperature of the third zone to 145°C. The temperature in the fourth zone is 145°C, the temperature in the fifth zone is 145°C, the temperature in the sixth zone is 155°C, the temperature in the seventh zone is 155°C, the temperature in the eighth zone is 155°C, the temperature of the head is 150°C, and the screw speed is set to 130 rpm , cross-linked polypropylene carbonate is obtained after extrusion, water-cooling, stretching and granulation. The tensile strength, glass transition temperature, thermal ...

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Abstract

The invention provides modified poly (propylene carbonate), which comprises a cross-linked poly (propylene carbonate) with polyphenyl polymethylene polyisocyanates as a cross-linking agent, as well as a polymer of hexanedioic acid and 1,2-propylene glycol ester, wherein the mass ratio of poly (propylene carbonate) to the polyphenyl polymethylene polyisocyanates is 100:(0.1-2), and the mass ratio of the cross-linked poly (propylene carbonate) to the polymer of hexanedioic acid and 1,2-propylene glycol ester is 100:(5-20). A preparation method of the modified poly (propylene carbonate) comprises the following steps: blending and extruding the poly (propylene carbonate) and the polyphenyl polymethylene polyisocyanates to obtain the cross-linked poly (propylene carbonate); and blending and extruding the cross-linked poly (propylene carbonate) and the polymer of hexanedioic acid and 1,2-propylene glycol ester to obtain the modified poly (propylene carbonate). The modified poly (propylene carbonate) provided by the invention is good in thermal stability, high in tensile elongation at break, good in transparency and capable of being biodegraded completely.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to modified polypropylene carbonate and a preparation method thereof. Background technique [0002] Polypropylene carbonate (PPC), also known as polypropylene carbonate, is an environmentally friendly biodegradable material obtained by copolymerization of carbon dioxide and propylene oxide. Polypropylene carbonate was first synthesized by Japanese scientist Inoue Xiangping and others (Inoue, S., Koinuma, H., Tsuruta, T., J. Polym. Sci., Polym. Lett. Ed., 1969,7, 287-292.) . Polypropylene carbonate materials have broad application prospects in packaging materials, fibers and nonwovens, and medical and health fields due to their carbon dioxide fixation and biodegradable properties. [0003] Although polypropylene carbonate has the above advantages, compared with general-purpose plastics, polypropylene carbonate has the characteristics of non-crystallization, low glass transition tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L69/00C08L67/02C08K5/29C08J3/24C08G18/44C08G18/42
Inventor 张会良郝艳平张贵宝刘三荣边俊甲梁宏玉董丽松李悦生
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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