High-fluidity and strong-hydrophobicity starch and preparation method thereof

A high-fluidity and hydrophobic technology, applied in coating and other directions, to achieve the effect of no three wastes, short production process and low cost

Inactive Publication Date: 2008-07-30
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, hydrophobic starch as a lubricant and anti-sticking agent has broad application prospects in the paper industry, textile industry, coating industry, biodegradab

Method used

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  • High-fluidity and strong-hydrophobicity starch and preparation method thereof
  • High-fluidity and strong-hydrophobicity starch and preparation method thereof
  • High-fluidity and strong-hydrophobicity starch and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] Example 1: Preparation of High Fluidity and Strong Hydrophobic Corn Starch

[0090] Step 1: Make Dry Corn Starch

[0091] Dry corn starch with a particle size of 80-100 μm to obtain dry corn starch; the drying temperature is 120° C., and the drying time is 4 hours;

[0092] The second step: the modified starch

[0093] Place 1.5Kg of dried cornstarch in the high mixer, accounting for 2 / 3 of the volume of the high mixer cavity;

[0094] (A) 3.75 g of hydrophobic modifier was added under the condition of stirring speed of 1500 r / min, and the first coating layer 2 was prepared after the modification temperature was 120 ° C and the modification time was 30 min under continuous stirring;

[0095] The hydrophobic modifier is compounded with titanate coupling agent NDZ-105 and silane coupling agent A-151, titanate coupling agent NDZ-105: silane coupling agent A-151=2:1;

[0096] (B) After adding 1.5g of hydrophobic 16nm silicon dioxide R972 under the condition of stirring ...

Embodiment 2

[0107] Example 2: High fluidity hydrophilic corn starch

[0108] Step 1: Make Dry Corn Starch

[0109] Dry corn starch with a particle size below 60 μm to obtain dry corn starch; the drying temperature is 80°C, and the drying time is 3.5 hours;

[0110] The second step: making a single-layer coated hydrophilic starch with high fluidity

[0111] Place 1.5Kg of dried cornstarch in the high mixer, accounting for 2 / 3 of the volume of the high mixer cavity;

[0112] Add 15g of hydrophilic 13nm alumina particles Al under the condition of stirring speed 2800r / min 2 o 3 C (degussa.), and at a modification temperature of 90°C, the second coating layer 3 was obtained after a modification time of 30 minutes under continuous stirring; that is, a single-layer coated hydrophilic starch with high fluidity (section structure as shown in Figure 1C).

[0113] The obtained cornstarch with high fluidity and hydrophilicity has an angle of repose of 26° and an activation index of 0%.

[011...

Embodiment 3

[0115] Example 3: Strong Hydrophobic Corn Starch

[0116] The first step: making dry starch

[0117] Dry corn starch with a particle size of 30-60 μm to obtain dry corn starch; the drying temperature is 100°C, and the drying time is 2.5 hours;

[0118] The second step: making modified starch

[0119] Place 1.5Kg of cornstarch dried in the first step in the high mixer, accounting for 2 / 3 of the volume of the high mixer cavity;

[0120] (A) Add 7.5g of aluminate coupling agent DL-2411-A at a stirring speed of 2000r / min, and make the first package after the modification temperature is 100°C and the modification time is 60 minutes under continuous stirring. cladding2;

[0121] (B) After adding 1.5 g of 10 μm silicon dioxide at a stirring speed of 2500 r / min, the second coating layer 3 was prepared after the modification temperature was 90° C. and the modification time was 15 minutes under continuous stirring;

[0122] (C) Add 7.5 g of aluminate coupling agent DL-2411-A at a ...

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Abstract

The invention discloses high flowing and strong hydrophobic starch and a preparation method thereof. The method comprises the following steps: the dry modification processing is performed to the starch by adopting the high-speed stirring equipment commonly used in the industry; a layer of hydrophobic film is wrapped on the surface of a starch granule, thereby obtaining the hydrophobic starch; simultaneously, a layer of flowing improver is wrapped on the surface of the hydrophobic starch granule, to ensure that the hydrophobic starch has good fluidity, thereby obtaining high flowing and strong hydrophobic starch granules. The technological process is simple, feasible, stable and reliable, the cost is low, the method has versatility, and the production can be operated under the prior production process and equipment condition, and the industrial large scale production can be realized. The modified starch prepared by adopting the method flows like water, floats on the water surface and cannot sink, has good fluidity as well as good hydrophobicity.

Description

technical field [0001] The present invention relates to a kind of method that adopts dry method to prepare high fluidity and strong hydrophobicity starch, more particularly, refers to a kind of under the condition of high-speed stirring, prepare two or more coating layers, and A method of starch with high fluidity and strong hydrophobicity. Background technique [0002] At present, the production methods of modified starch in my country can be divided into three types: organic solvent method, water solvent method and dry method. Among them, the organic solvent method and the water solvent method can also be collectively referred to as the wet method, and its advantages are mild reaction conditions, the modifier and the starch can be fully mixed evenly, the production process is easy to control, and the reaction conversion rate is high. But there are also obvious defects in its production, such as long reaction time, long production process, large production water consumptio...

Claims

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Application Information

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IPC IPC(8): C08J7/04C08L3/02
Inventor 沈志刚蔡楚江李金芝麻树林邢玉山
Owner BEIHANG UNIV
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