Microsphere-type high-hydrophoby starch, as well as preparation method and application thereof

A high-hydrophobic, microsphere-type technology, which is applied in the field of natural polymer material modification, can solve the problems of affecting the compatibility of synthetic resins, difficulty in significantly improving hydrophobicity, and poor hydrophobicity of modified starch, achieving low cost and hydrophobicity. Good effect and short modification time

Inactive Publication Date: 2013-10-16
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low degree of substitution of esterification and etherification, it is difficult to significantly improve the hydrophobicity
Moreover, there are still problems such as environmental pollution, high energy consumption, high cost, and complicated post-processing; physical modification: mainly through physical and mechanical means such as microwave radiation and ultrasonic oscillators, the starch granules are miniaturized, thereby improving the synthesis of starch in polyolefins. Dispersion in the resin, indirectly improving its compatibility with synthetic resins
Short processing time, high efficiency, environmental protection, simple and easy process, but the modified starch itself has poor hydrophobicity; coupling modification: modified by coupling agent, although the process is simple, no pollution, low energy consumption, and significant hydrophobicity improve
However, due to the high price of silane, titanate and aluminate coupling agents, it is difficult to popularize because of the high cost, and the modified starch particle size is too large and uneven, which directly affects its compatibility with polyolefin synthetic resins.

Method used

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  • Microsphere-type high-hydrophoby starch, as well as preparation method and application thereof
  • Microsphere-type high-hydrophoby starch, as well as preparation method and application thereof
  • Microsphere-type high-hydrophoby starch, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Prepare dry starch: dry corn starch at 150°C for 1.5h;

[0027] The second step: preparation of micronized starch: take 100 mass points of dried corn starch in an ultrasonic oscillator, frequency 60KHz, room temperature, ultrasonic oscillation for 2h;

[0028] The third step: preparation of highly hydrophobic starch: transfer 100 mass points of the above-mentioned micronized starch into a high-speed mixer: stir at 3000 rpm, add 0.5 mass fraction of peanut acidified oil, and stir at 80°C for 0.5 h. 3000 rpm, add 1 mass fraction of swill waste oil, and stir at 80°C for 0.5 h. 150 ℃, drying for 2 hours to obtain microspherical high hydrophobic starch.

[0029]Unrefined corn starch granules are irregularly arranged and agglomerated into lumps (see figure 2 ), while the agglomeration phenomenon of microspherical highly hydrophobic corn starch obviously disappeared, the particles became smaller and evenly arranged, and the surface showed a bright hydrophobic layer ...

Embodiment 2

[0031] Step 1: Prepare dry starch: dry wheat starch at 120°C for 3 hours;

[0032] The second step: preparing micronized starch: take 100 parts by mass of dried wheat starch in an ultrasonic oscillator, 80KHz, room temperature, ultrasonic oscillation for 1h;

[0033] The third step: preparing starch with a surface hydrophobic layer: transfer the above-mentioned 100 parts by mass of micronized starch to a high-speed mixer. Under stirring at 2500 rpm, at 60°C, add 1 mass part of soy acidified oil, and stir for 1 hour. Under stirring at 2500 rpm, add 0.5 mass fraction of lard waste oil, and stir at 60° C. for 1 hour. Dry at 120°C for 3 hours to obtain microspherical highly hydrophobic starch.

[0034] The particle size of unmodified wheat starch is mostly distributed in 5-12 microns, and the contact angle is about 20°. The particle size of modified wheat starch is mostly distributed in 0.1-3 microns, and the contact angle is 154°.

Embodiment 3

[0036] The first step: preparing dry starch: drying potato starch at 100°C for 4 hours;

[0037] The second step: preparing micronized starch: take 100 parts by mass of dried potato starch in an ultrasonic oscillator, 100KHz, room temperature, ultrasonic oscillation for 1h;

[0038] Step 3: Preparation of starch with a surface hydrophobic layer: transfer the above 100 mass fractions of micronized potato starch to a high-speed mixer, stir at 2000 rpm, and add 0.8 mass fractions of rapeseed acidified oil / sunflower acidified oil at 40°C (1 / 1 mass ratio), stirring for 2h. Under stirring at 2000 rpm, at 40°C, add 0.7 parts by mass of vegetable oil waste oil, and stir for 2 hours. Dry at 110°C for 4 hours to obtain microspherical highly hydrophobic potato starch.

[0039] The particle size of unmodified potato starch is mostly distributed in 25-39 microns, and the contact angle is about 5°. The particle size of modified potato starch is mostly distributed in 5-8 microns, and the c...

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Abstract

The invention belongs to the technical field of modification of natural polymer materials, and particularly relates to microsphere-type high-hydrophoby starch, as well as a preparation method and the application thereof. The adopted technical scheme is that the preparation method of the microsphere-type high-hydrophoby starch comprises the following steps: dry starch is subjected to ultrasonic oscillation processing firstly, a coupling agent and a hydrophobic agent are added separately in sequence under the condition of stirring with high speed, and the microsphere-type high-hydrophoby starch is obtained after drying. The hydrophobic starch can remedy shortages of chemical modification, physical modification and coupling agent modification in the prior art, and is small in particle size, large in specific surface area, high in the efficiency of being packaged by the coupling agent and the hydrophobic agent, strong in hydrophobic nature, good in mutual solubility with polyolefin resin, and excellent in physical and biological degradability of modified starch-based plastic.

Description

technical field [0001] The invention belongs to the technical field of modification of natural polymer materials, and in particular relates to microspherical highly hydrophobic starch and its preparation method and application. Background technique [0002] Although fully biodegradable resins such as polylactic acid (PLA) and poly 3-hydroxybutyrate (PHB) have been around for a long time, due to their relatively expensive prices, the physical properties of their plastic products are difficult to meet the application, so far they have not been widely promoted. application. Biomass-based synthetic resin-filled plastics are still one of the economical and effective ways to control white pollution, protect the environment and ecological balance. Highly filled starch-based plastics are already promising. [0003] Starch is the most widely used biomass. Starch-based plastics can be divided into starch-filled plastics and full-starch plastics. Whole starch plastics are obtained ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08K5/101C08B30/00C08L27/06C08L29/04
Inventor 孟平蕊李良波于浩强
Owner UNIV OF JINAN
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