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Hydrophobic starch and preparation method thereof

A technology for hydrophobic starch and starch, applied in the field of hydrophobic starch and its preparation, can solve the problems of inability to preserve starch granule structure, large environmental pollution, low reaction efficiency, etc. simple effect

Active Publication Date: 2018-01-23
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional starch hydrophobic modification generally adopts aqueous phase method, organic solvent method and reactive extrusion method. However, these methods have disadvantages such as low reaction efficiency, high production cost, great environmental pollution and inability to preserve the structure of starch granules.

Method used

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  • Hydrophobic starch and preparation method thereof
  • Hydrophobic starch and preparation method thereof
  • Hydrophobic starch and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing hydrophobic starch by in-situ solid phase grafting of the present invention comprises the following steps:

[0026] (1) Disperse 0.02 parts by weight of zinc lactate in 2 parts by weight of lactic acid monomer to obtain a dispersion liquid, mix the dispersion liquid with 20 parts by weight of starch, and stir evenly to obtain a mixture.

[0027] (2) Put the mixture in a hydrothermal reaction kettle, seal it and place it for 1 hour, so that the dispersion liquid can fully penetrate into the starch.

[0028] (3) React at 100°C for 3h to obtain lactic acid grafted starch.

[0029] (4) The lactic acid grafted starch was washed with acetone to remove the unreacted lactic acid and polylactic acid homopolymer, and then dried in an oven at 50° C. to obtain pure lactic acid grafted starch.

Embodiment 2

[0031] A method for preparing hydrophobic starch by in-situ solid phase grafting of the present invention comprises the following steps:

[0032] (1) Disperse 0.1 parts by weight of azobisisobutyronitrile in 10 parts by weight of methyl methacrylate monomer to obtain a dispersion, mix the dispersion with 20 parts by weight of starch, and stir to obtain a mixture .

[0033] (2) Put the mixture in a hydrothermal reaction kettle, seal it and place it for 6 hours, so that the dispersion liquid can fully penetrate into the starch.

[0034] (3) Reaction at 70° C. for 12 h to obtain methyl methacrylate grafted starch.

[0035] (4) Methyl methacrylate grafted starch is washed with acetone to remove unreacted methyl methacrylate monomer and polymethyl methacrylate homopolymer, and then placed in a 50°C oven to dry to obtain methacrylic acid Pure methyl ester grafted starch.

Embodiment 3

[0037] A method for preparing hydrophobic starch by in-situ solid phase grafting of the present invention comprises the following steps:

[0038] (1) Disperse 0.4 parts by weight of dibenzoyl peroxide in 20 parts by weight of styrene monomer to obtain a dispersion liquid, mix the dispersion liquid with 20 parts by weight of starch, and stir evenly to obtain a mixture.

[0039] (2) Put the mixture in a hydrothermal reaction kettle, seal it and place it for 12 hours, so that the dispersion liquid can fully penetrate into the starch.

[0040] (3) Reaction at 90°C for 8h to obtain styrene-grafted starch.

[0041] (4) Styrene-grafted starch was washed with acetone to remove unreacted styrene monomer and polystyrene homopolymer, and then dried in an oven at 50° C. to obtain pure styrene-grafted starch.

[0042] The original starch, the lactic acid grafted starch of embodiment 1 and the methyl methacrylate grafted starch of embodiment 2 are carried out infrared spectrum detection re...

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Abstract

The invention discloses hydrophobic starch and a preparation method thereof. The preparation method comprises the following steps: dispersing an initiator into grafting monomers to obtain a dispersionliquid, and mixing the dispersion liquid and starch to obtain a mixture; sealing the mixture in a hydrothermal reactor until the dispersion liquid fully penetrates through the starch; reacting for 1to 12 hours at 60 to 100 DEG C to obtain the hydrophobic starch. According to the hydrophobic starch and the preparation method thereof, the hydrophobic starch is obtained by adopting an in-situ solidphase grafting method in which starch and a hydrophobic modifying agent perform a chemical reaction at a certain temperature and pressure without water or an organic solvent, wherein the in-situ solid phase grafting method is high in reaction efficiency and simple in process, and does not have environmental pollution; moreover, particle structures of the starch can also be maintained effectively;the prepared hydrophobic starch has the advantages of high grafting efficiency, low water absorption rate and the like.

Description

technical field [0001] The invention relates to the technical field of starch modification and biomass composite materials, in particular to a hydrophobic starch and a preparation method thereof. Background technique [0002] Plastic products have been widely used in various sectors of the national economy, largely replacing metal, wood, glass and even paper products. However, traditional plastics can hardly be degraded in nature. At the same time, there is a lack of effective recycling and processing systems, related special management regulations and economic policies, resulting in worldwide environmental protection and social problems - "white pollution". An effective way to control "white pollution" is to develop biodegradable plastics. Among them, the starch / polylactic acid composite material combines the advantages of low starch price, wide sources, environmental protection and good mechanical properties, water resistance, processing performance and degradability of p...

Claims

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Application Information

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IPC IPC(8): C08G63/08C08B31/00C08F251/00C08F220/14C08F212/08
Inventor 左迎峰吴义强何啸宇王驰徐冰杰刘文杰肖俊华屠茹茹刘卯丑
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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