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Modified thermoplastic starch and preparation method and application thereof

A thermoplastic starch modification technology, applied in the field of modified thermoplastic starch and its preparation and application, can solve the problems of poor performance stability, poor continuity, weakened hydrogen bonds, etc.

Inactive Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is that the thermoplastic starch preparation process in the prior art has poor continuity, and the prepared pellets are easy to stick and agglomerate due to the precipitation of the plasticizer, which affects subsequent use and has poor performance stability. The problem is to provide a modified thermoplastic starch. After modification, the hydrogen bonds between the starch molecules become weaker, the amount of plasticizer required for thermal plasticization is reduced, and the possibility of particle adhesion caused by the precipitation of the plasticizer to affect subsequent use is reduced.

Method used

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Embodiment 1

[0056] The reactive monomer used in the present invention——hydroxyethyl methacrylate (HEMA) is the analytically pure product of Tokyo Chemical Industry Co., Ltd. (TCI), and the initiator——2,5-dimethyl-2,5- Di-tert-butyl peroxide hexane (Double 25) is an analytically pure product of Bailingwei Technology Co., Ltd., which is dispersed in HEMA to prepare a solution with a volume fraction of 5%. The Micro 27 co-rotating twin-screw extruder (screw diameter 27mm, aspect ratio 40) of German Leistritz company was used to mix, plasticize, react and extrude the raw material starch, glycerin and double 25 HEMA solution to produce Graft modified thermoplastic starch (mTPS). The extruder has 11 sections from the feed port to the die, numbered 1-11, wherein the first section only plays the role of feeding, and cannot be heated. The temperatures of sections 2-11 of the extruder are respectively: 80°C, 100°C, 120°C, 140°C, 160°C, 180°C, 180°C, 180°C, 180°C and 180°C, and the screw speed is s...

Embodiment 2

[0058]The above-mentioned HEMA, the reactive monomer used in the present invention of double 25--hydroxyethyl methacrylate (HEMA) is the analytically pure product of Tokyo Chemical Industry Co., Ltd. (TCI), initiator--2 , 5-Dimethyl-2,5-di-tert-butylperoxyhexane (Double 25) is an analytically pure product of Bailingwei Technology Co., Ltd., which is dispersed in HEMA to form a volume fraction of 8%. The solution. The Micro 27 co-rotating twin-screw extruder (screw diameter 27mm, aspect ratio 40) of German Leistritz company was used to mix, plasticize, react and extrude the raw material starch, glycerin and double 25 HEMA solution to produce Graft-modified thermoplastic starch. The extruder has 11 sections from the feeding port to the die, numbered 1-11, wherein the first section only plays the role of feeding, and can not be heated. The temperatures of sections 2-11 of the extruder are respectively: 80°C, 100°C, 120°C, 140°C, 160°C, 180°C, 180°C, 180°C, 180°C and 180°C, and ...

Embodiment 3

[0060] The initiator used in the present invention---benzoyl peroxide (BPO) is the product of 98% purity of Bailingwei Technology Co., Ltd. BPO was dispersed in HEMA as described above to make a solution with a volume fraction of 5%. The HEMA (volume fraction 5%) of above-mentioned cornstarch, glycerol and BPO is directly mixed in the Micro27 type co-rotating twin-screw extruder (screw diameter 27mm, aspect ratio 40) of Germany Leistritz company , plasticizing, reacting, and extruding to make graft-modified thermoplastic starch. The extruder has 11 sections from the feed port to the die, numbered 1-11, wherein the first section only plays the role of feeding, and cannot be heated. The temperatures of sections 2-11 of the extruder are respectively: 60°C, 80°C, 120°C, 140°C, 140°C, 140°C, 140°C, 140°C, 140°C and 140°C, and the screw speed is set at 100 rpm. The K-CL-24-KT20 loss-in-weight feeder of Swiss K-Tron Company was used to feed cornstarch to the first section of the tw...

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Abstract

The invention relates to modified thermoplastic starch as well as a preparation method and application thereof, and mainly solves the technical problems of poor continuity of a thermoplastic starch preparation process, easiness in adhesion and caking of prepared granules due to precipitation of a plasticizer, influence on subsequent use and poor performance stability in the prior art. The modifiedthermoplastic starch comprises the following components in parts by mass: (1) 55-85 parts of raw material starch; (2) 15 to 45 parts of a plasticizer; (3) 1-20 parts of a reactive monomer; and (4) 0.05 to 1 part of an initiator, and is prepared through reaction of the above components. According to the technical scheme, the problems are well solved, and the method can be used for industrial production of thermoplastic starch modified materials.

Description

technical field [0001] The invention relates to a modified thermoplastic starch and its preparation method and application. Background technique [0002] Starch is also a degradable natural polymer with a high annual output, widely present in the seeds and tubers of plants, with about 15% starch in potatoes, about 60% starch in wheat, and up to 75% starch in rice. In addition to human food and animal feed, it is mainly used in glue, paste, paper and textile industries. Since starch is a natural polymer that plants convert carbon dioxide and water in the atmosphere into through photosynthesis, the carbon element in it belongs to the recently fixed carbon, which is different from the millions of years in fossil fuels such as oil or coal and their petrochemical products. The carbon elements fixed before, the carbon elements fixed in different periods can be passed through 14 C isotope calibration method for detection. Due to these differences, bio-based polymer materials pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/20C08F220/18C08L67/02C08L51/02C08J5/18
CPCC08F251/00C08L67/02C08L51/02C08J5/18C08J2367/02C08J2351/02
Inventor 王洪学周炳白瑜贾钦
Owner CHINA PETROLEUM & CHEM CORP
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