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A kind of high tenacity starch-based thermoplastics and preparation method thereof

A thermoplastic and starch-based technology, which is applied in the field of high-toughness starch-based thermoplastics and its preparation, can solve the problems of migration, increase material cost, affect the use effect, etc., and achieve the effect of simple and easy preparation process and low cost.

Inactive Publication Date: 2015-10-28
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And a very small amount of patents about full starch degradable plastics, such as the preparation method of starch type full degradable plastics reported in Chinese patent CN 1415651, contains about 40% polyethylene resin in its composition, and the degradation effect is not good; Chinese patent CN 1303154C reported For full-starch biodegradable plastics, most of the plasticizers used are small molecules, which will inevitably migrate during use and affect the use effect
In addition, in the preparation process, the existing starch is often modified in the solid phase before processing, which will significantly increase the cost of materials

Method used

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  • A kind of high tenacity starch-based thermoplastics and preparation method thereof
  • A kind of high tenacity starch-based thermoplastics and preparation method thereof

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preparation example Construction

[0033] At the same time, the present invention provides a method for preparing high-toughness starch-based thermoplastics, which specifically includes the following steps: taking starch, antioxidant, stabilizer, colorant, and modified polyethylene prepared according to the above-mentioned preparation process. Diol, standby; Weigh starch, modified polyethylene glycol, antioxidant, stabilizer and coloring agent according to the above weight parts, and add them together in the screw extruder, and the barrel temperature of the screw extruder Adjust the temperature to 120-140°C, the feeding frequency is 3.5-10Hz, and the screw speed is 60-150rpm; each component reacts together in the screw extruder and is finally extruded. Tough starch based thermoplastic.

[0034] In the present invention: the starch is one or more of corn starch, tapioca starch, soybean starch or rice starch; the terminal active agent is a compound containing two acid chloride groups or two isocyanate groups, spe...

Embodiment 1

[0037] According to the molar ratio, 1 mole part of polyethylene glycol with an average molecular weight of 1000 in the molten state is slowly added dropwise to 2 mole parts of toluene diisocyanate solution. The whole dropping process is carried out under the protection of nitrogen, and keeps stirring at 100 ° C. After the polyethylene glycol is completely added, continue to stir for 20 minutes, then cool and break the whole system, so as to obtain the required modified polyethylene glycol and set aside; weigh 80 parts of dried starch, 20 parts by weight Modified polyethylene glycol prepared in two parts, and added to the twin-screw extruder together, the barrel temperature of the twin-screw extruder is 120-140°C, the feeding frequency is 3.5Hz, and the screw speed is 75rpm; each group The parts are reacted together in the screw extruder and finally extruded, and the high toughness starch-based thermoplastics of the present invention can be made by granulating after extrusion; ...

Embodiment 2

[0039] According to the molar ratio, 1 mole part of polyethylene glycol with an average molecular weight of 6000 in the molten state is slowly added dropwise to 2 mole parts of diphenylmethane diisocyanate solution under heating. The whole dropping process is carried out under the protection of nitrogen, and kept Stir continuously at 100°C. After the polyethylene glycol is completely added, continue to stir for 20 minutes, then cool and break the whole system to obtain modified polyethylene glycol and set aside; weigh 95 parts of dried starch by weight , 5 parts of prepared modified polyethylene glycol, and added together in the single-screw extruder, the barrel temperature of the extruder is 130-140 ℃, the feeding frequency is 5Hz, and the screw speed is 100rpm; each component React together in the screw extruder and finally be extruded. After extrusion, the high-toughness starch-based thermoplastic of the present invention can be produced by granulation; after the resulting p...

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Abstract

The invention provides a high toughness starch based thermoplastic plastic comprising the following components by weight: 80-95 parts of starch, 5-20 parts of modified polyethylene glycol, 0-10 parts of an antioxidant, 0-10 parts of a stabilizer and 0-10 parts of a colorant; the invention also discloses a preparation method of the high toughness starch based thermoplastic plastic, and the preparation method is specifically as follows: adding the components together into a screw extruder, adjusting the screw extruder barrel temperature to 120-140 DEG C, feeding frequency to 3.5 5Hz, and the screw speed to 60-150rpm; reacting the components together in the screw extruder and eventually extruding, and then granulating to obtain the high toughness starch based thermoplastic plastic which can be completely biodegradable. The high toughness starch based thermoplastic plastic has the characteristics of being completely biodegradable, simple in preparation process and low in the material cost, so that the mass production can be realized.

Description

【Technical field】 [0001] The invention relates to a polymer material and a method thereof, in particular to a fully biodegradable high-toughness starch-based thermoplastic and a preparation method thereof. 【Background technique】 [0002] Since the 1990s, the problem of plastic waste polluting the environment in my country has become increasingly serious. According to the statistics of relevant departments, in recent years, China's packaging plastics are about 4 million tons, of which disposable plastic packaging that is difficult to recycle accounts for about 30%, and the annual plastic packaging waste is about 1.2 million tons; plastic film is more than 400,000 tons , due to its thinness, it is broken in the farmland after use and mixed with a large amount of sand, which is difficult to recycle; about 400,000 tons of disposable daily sundries that are difficult to recycle and medical supplies that are not suitable for recycling. Plastic waste amounts to about 2 million ton...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L3/02C08L71/08C08G65/48B29C47/92B29C48/40B29C48/92
CPCB29C47/92B29C47/0004B29C47/0011B29C47/40B29C47/6087B29C2947/92057B29C2947/9259B29C2947/92695B29C2947/92704B29C2947/92895B29C48/92B29C2948/92704B29C48/022B29C48/04B29C48/40B29C48/625B29C2948/92057B29C2948/9259B29C2948/92695B29C2948/92895
Inventor 方辉吴方娟
Owner FUJIAN UNIV OF TECH