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The preparation method of modified polypropylene carbonate

A technology for modifying polypropylene carbonate, which is applied in the field of preparation of modified polypropylene carbonate, can solve the problems of product loss of use value and no breakthrough progress, and achieve easy operation, significant modification effect, The effect of high application value

Active Publication Date: 2015-08-19
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Meng Yuezhong, Peng Shuwen, etc. (Essential work of fracture analysis for starch filled poly(propylene carbonate)composites.Wang.XL, Li.RKY, Cao.YX and Meng.YZ.Materials and Design,2007,28,1934 and Special interaction between poly (propylene carbonate) and corn starch.Peng.SW,Wang.XY and Dong.LS.Polym.Compos.,2005,26,37.) The starch and polypropylene carbonate were directly blended by internal mixer to prepare polypropylene Propylene carbonate / starch blend, the study found that the glass transition temperature of the blend (when the amount of starch added is 30%, increased by 6°C) and thermal stability have been improved to a certain extent; Li Xiaohong et al. ( Completely Biodegradable Composites of Poly(propylene carbonate) and short,Lignocellular Fiber Hildegardia populifolia.Li.XH,Meng.YZ,Wang.SJ,Rajulu.AV and Tjong.SC.J Poly Sci Part B:Polym Phys,2004,42,666) Polypropylene carbonate was modified with lignocellulose fibers. The addition of lignocellulose fibers also made the glass transition temperature of the blend (when the blend contained 40wt% lignocellulose, it increased by 6.5°C) and thermal stability (40°C increase when the blend contains 40wt% lignocellulose) are improved; although blending with other high polymers can improve the performance of polypropylene carbonate to a certain extent, it has not achieved A breakthrough, and the blends prepared by this method are also more prone to macroscopic phase separation, which makes the product lose its use value
[0004] So far, there is no report on the use of sorbitan fatty acid esters to obtain modified polypropylene carbonate materials with higher glass transition temperature and better thermal stability through simple physical modification.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Mix 5g of sorbitan monostearate and 100g of polypropylene carbonate into a uniform premix, then add the premix into a twin-screw extruder at a temperature between 90°C and 170°C Melting, blending, extruding and granulating is carried out to obtain the modified polypropylene carbonate.

[0017] Using TA-Q800 to measure polypropylene carbonate and product modified polypropylene carbonate, it can be seen that the glass transition temperature of polypropylene carbonate is 32 ° C, and the glass transition temperature of modified polypropylene carbonate According to Perkin-Elmer Pyris 1 TGA analysis, the initial decomposition temperature of polypropylene carbonate is 205 °C, while the initial decomposition temperature of modified polypropylene carbonate is 257 °C.

Embodiment 2

[0019] Mix 10g of sorbitan monostearate and 100g of polypropylene carbonate into a uniform premix, then add the premix into a twin-screw extruder at a temperature between 80°C and 180°C Melting, blending, extruding and granulating is carried out to obtain the modified polypropylene carbonate.

[0020] Using TA-Q800 to measure polypropylene carbonate and product modified polypropylene carbonate, it can be seen that the glass transition temperature of polypropylene carbonate is 32 ° C, and the glass transition temperature of modified polypropylene carbonate According to Perkin-Elmer Pyris 1 TGA analysis, the initial decomposition temperature of polypropylene carbonate is 205 °C, while the initial decomposition temperature of modified polypropylene carbonate is 245 °C.

Embodiment 3

[0022] Mix 25g of sorbitan monostearate and 100g of polypropylene carbonate into a uniform premix, then add the premix into the twin-screw extruder at a temperature between 90°C and 170°C Melting, blending, extruding and granulating is carried out to obtain the modified polypropylene carbonate.

[0023] Using TA-Q800 to measure polypropylene carbonate and product modified polypropylene carbonate, it can be seen that the glass transition temperature of polypropylene carbonate is 32 ° C, and the glass transition temperature of modified polypropylene carbonate According to Perkin-Elmer Pyris 1 TGA analysis, the initial decomposition temperature of polypropylene carbonate is 205 °C, while the initial decomposition temperature of modified polypropylene carbonate is 248 °C.

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Abstract

The present invention relates to a modified poly propylene carbonate preparation method, particularly to a method for modifying poly propylene carbonate by using sorbitan fatty acid ester. The preparation method comprises: preparing sorbitan fatty acid ester and poly propylene carbonate into a uniform premix, and carrying out melt blending on the premix at a temperature of 80-180 DEG C to obtain the modified poly propylene carbonate. According to the present invention, with the preparation method, the modified poly propylene carbonate with characteristics of high glass transition temperature and good thermal stability can be obtained; and the preparation method has characteristics of simple process, easy operation, significant modification effect and high application value, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of modified polypropylene carbonate, in particular to a method for modifying polypropylene carbonate with sorbitan fatty acid ester. technical background [0002] Polypropylene carbonate is an aliphatic polycarbonate formed by the copolymerization of carbon dioxide and propylene oxide. It can be completely biodegraded in the natural environment or under mandatory composting conditions. In addition, polypropylene carbonate is a kind of colorless Transparent solid, non-toxic, tasteless, with high flexibility, low gas transmission rate, good biocompatibility, etc. It can be used as a toughening agent for brittle materials, as a packaging film for food and medicine, as a medicine Sustained release carrier, etc. my country is currently facing serious white pollution and energy shortage problems. The use of biodegradable materials such as PPC in some fields such as disposable plastic products instead of ordinary...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L69/00C08K5/103
Inventor 马永梅安晶晶曹新宇王佛松
Owner INST OF CHEM CHINESE ACAD OF SCI