Mechanism and preparation method of modified polypropylene carbonate assistant based on bio-based degradation

A polypropylene carbonate and bio-based technology, applied in the field of bio-based raw material preparation, can solve problems such as waste of heat, weak intermolecular forces, and restrictions on the promotion and use of polypropylene carbonate, so as to avoid waste and increase heat The effect of utilization

Inactive Publication Date: 2018-07-20
刘文海
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a variety of efficient and cheap synthetic polypropylene carbonate catalytic systems have been developed at home and abroad, and large-scale production of polypropylene carbonate has entered industrialization; however, due to the relatively soft molecular weight of polypropylene carbonate and the intermolecular interaction The strength is weak, it is in an amorphous state at room temperature, it is a non-crystalline high polymer, and its processing performance is not ideal; when it is heated, it is also prone to unzipping degradation caused by molecular chain terminal hydroxyl groups, and its thermal stability is poor
The above shortcomings limit the popularization and use of polypropylene carbonate to a large extent.
[0003] Regarding the use of sorbitan fatty acid ester, it is a good method to obtain a modified polypropylene carbonate material with a higher glass transition temperature and better thermal stability through a simple physical modification method. The process needs to use the screw extruder to plasticize and extrude the raw materials, and the screw extruder will cause waste of heat when exhausting

Method used

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  • Mechanism and preparation method of modified polypropylene carbonate assistant based on bio-based degradation
  • Mechanism and preparation method of modified polypropylene carbonate assistant based on bio-based degradation
  • Mechanism and preparation method of modified polypropylene carbonate assistant based on bio-based degradation

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Experimental program
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Effect test

Embodiment 1

[0021] A mechanism and preparation method of a modified polypropylene carbonate additive based on bio-based degradation, including a raw material 1, a high-speed mixer 11, and a screw extruder 2, and the raw materials include sorbitan monostearate, poly Propylene carbonate, high-speed mixer 11 is connected with screw extruder 2, and screw extruder 2 comprises machine barrel 3, feeding conveying device 4, air pipe 5, and feeding conveying device 4 is installed on the machine barrel 3, feeds The conveying device 4 comprises a discharge cylinder 41, an outer casing 42, an inner cylinder 44, a rotating shaft 45, and a screw pusher 46. The discharge cylinder 41 is installed on the machine barrel 3, the outer casing 42 is installed on the discharge cylinder 41, and the feed hopper 43 is installed on the outer casing 42, the inner cylinder 44 is installed in the outer casing 42, the rotating shaft 45 is installed inside the inner cylinder, one end of the rotating shaft passes through ...

Embodiment 2

[0023] When preparing, first put the raw materials into the high-speed mixer 11 and mix them thoroughly, then put the raw materials into the screw extruder 2 to plasticize, extrude and granulate to produce modified polypropylene carbonate. The generated exhaust gas flows to the air pipe 5 to heat the raw materials in the inner cylinder 44. The protrusions 9 in the air pipe 5 make the exhaust gas turbulent, and each part of the exhaust gas can transfer heat to the raw materials, and the small particle impurities in the exhaust gas are filtered The filter plate 82 is filtered out, and the large particle impurities fall in the impurity tank 10. When cleaning or replacement is required, the filter plate 82 is disassembled from the sealing ring 7.

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Abstract

The invention relates to a mechanism and preparation method of a modified polypropylene carbonate assistant based on bio-based degradation. The mechanism and preparation method of the modified polypropylene carbonate assistant based on bio-based degradation are characterized in that raw materials, a high-speed mixer and a screw extruder are included, the raw materials include sorbitan monostearateand polypropylene carbonate, the screw extruder comprises an extruder barrel, a feeding conveying device and an air pipe, the feeding conveying device is mounted on the extruder barrel, and the feeding conveying device comprises a discharging barrel, a shell, an inner barrel, a rotating shaft and a screw pusher; and the inner barrel is mounted in the shell, the upper portion of the extruder barrel is connected with one end of the air pipe, and the air pipe penetrates through the shell and is wound around the outer surface of the inner barrel. According to the technical scheme, the air pipe isadditionally arranged, so that waste air exhausted from the extruder barrel bypasses the outer side of the inner barrel, the raw materials in the feeding conveying device are heated by utilizing waste heat of the waste air, and waste of the heat is avoided.

Description

technical field [0001] The invention belongs to the technical field of preparation of bio-based raw materials, and in particular relates to the mechanism and preparation method of a modified polypropylene carbonate additive based on bio-based degradation. Background technique [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 s...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B29C47/10B29C47/76B29C47/68B29C48/76
CPCB29C48/285B29C48/69B29C48/76
Inventor刘文海钟玉玲
Owner刘文海