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Method for preparing hydrophobic thermoplastic starch by using alkenyl succinic anhydride

A technology of alkenyl succinic anhydride and thermoplastic starch, which is applied in the field of plastic modification and can solve the problems of high price, difficulty in popularization, loss of usability, etc.

Inactive Publication Date: 2008-07-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional thermoplastic starch (TPS) uses polyol as plasticizer, which is easy to recrystallize during storage, aging and brittle, and loses its performance; Its structure is quickly destroyed by water molecules, making it completely useless
At present, starch is often treated with coupling agent to increase its hydrophobicity, but there is a problem of high price and it is not easy to popularize

Method used

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  • Method for preparing hydrophobic thermoplastic starch by using alkenyl succinic anhydride

Examples

Experimental program
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Effect test

Embodiment 1

[0009] Example 1, first cornstarch and alkenyl succinic anhydride were added to a mixer at a speed of 5000 rpm at a mass ratio of 100:0.1 and mixed for 8 minutes; then the mixture was closed and placed for 10 hours; passed through a screw plastic extruder Extruding to produce hydrophobized thermoplastic starch, wherein the extrusion temperature of the mixture from the feed port to the discharge port is 120°C-130°C-130°C-110°C in sequence.

Embodiment 2

[0010] Example 2, firstly, wheat starch and alkenyl succinic anhydride were added to a mixer at a speed of 3000 rpm in a mass ratio of 100:1 and mixed for 6 minutes; then the mixture was closed and placed for 6 hours; passed through a screw plastic extruder Extruding to produce hydrophobized thermoplastic starch, wherein the extrusion temperature of the mixture from the feed port to the discharge port is 120°C-130°C-130°C-110°C in sequence.

Embodiment 3

[0011] Embodiment 3, at first sweet potato starch and alkenyl succinic anhydride are joined in the mixer that rotating speed is 1000 revs / min by the mass ratio of 100:4 and mix for 2 minutes; Then the mixture is closed and placed for 12 hours; Extruding to produce hydrophobized thermoplastic starch, wherein the extrusion temperature of the mixture from the feed port to the discharge port is 120°C-130°C-130°C-110°C in sequence.

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Abstract

The invention discloses a preparation method for hydrophobic thermoplastic starch with alkenyl succinic anhydride, which comprises the steps that: firstly starch and alkenyl succinic anhydride (ASA) are added in a high-speed mixer and mixed for 2 to 10 minutes; then the mixture is sealed and deposited for 4 to 12 hours, and is extruded from a screw plastic extruder to obtain the hydrophobic thermoplastic starch. The preparation method for hydrophobic thermoplastic starch with alkenyl succinic anhydride has the advantages that since the adopted alkenyl succinic anhydride (ASA) has long fatty hydrocarbon chains (C14 to C18) and five-membered anhydride rings, and can react with the hydroxy in the starch to form the ester bond, the introduced long fatty hydrocarbon chains also have the good internal plasticization effect while having the excellent hydrophobic property; and not only recrystallization of the starch is avoided, but also hydrophobic property of the thermoplastic starch can be obviously improved.

Description

technical field [0001] The invention belongs to the technical field of plastic modification, in particular to a method for preparing hydrophobized thermoplastic starch by using alkenyl succinic anhydride. Background technique [0002] The development of biodegradable plastics is a feasible way to control the "white pollution" caused by plastic waste. Among the various materials that can be used to prepare biodegradable plastics, starch is considered to be one of the most promising biodegradable materials due to its good biodegradability, abundant sources, low price, and short regeneration cycle. However, the traditional thermoplastic starch (TPS) uses polyol as plasticizer, which is easy to recrystallize, age and become brittle and lose its performance during storage; Its structure is quickly destroyed by water molecules, making it completely useless. At present, starch is often treated with coupling agent to increase its hydrophobicity, but there is a problem of high pric...

Claims

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Application Information

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IPC IPC(8): C08B31/02B29C47/92B29C48/92
CPCB29C47/92B29C48/919B29C48/04B29C48/9185B29C48/92B29C2948/92704B29C2948/92895
Inventor 沈一丁李小瑞李刚辉费贵强王海花
Owner SHAANXI UNIV OF SCI & TECH
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