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Modified starch and preparation method and application thereof

A starch and modification technology, applied in the field of modified starch and its preparation, can solve problems such as difficult control of production conditions, impact on product quality, and large water consumption

Active Publication Date: 2020-09-22
RISINGSTAR BIOTECH GUANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods have disadvantages. The cationic starch produced by the wet method not only consumes a lot of water, but also the discharged sewage pollutes the environment. The wastewater is difficult to treat, and the alkaline chemicals used can lead to starch degradation and transformation. low rate
Dry production is to mix starch with reactive chemical reagents, dry to almost anhydrous and then react at 120-150°C. Although the pollution is less, the disadvantages are low reaction conversion rate, relatively high requirements for equipment and technology, and high production costs. , production conditions are difficult to control, starch products are easily over-gelatinized, which affects product quality, and the reaction cycle is long and energy consumption is high; the organic solvent method uses a large amount of water-soluble organic solvents (such as methanol, ethanol, isopropanol, etc.) in the preparation process ), disperse the starch in it to form a slurry, and react with the cationizing agent to prepare the cationic starch
Due to the use of a large amount of organic solvents, this method has the disadvantages of high production cost, poor safety, and easy pollution of the environment, so it is rarely used in industry.

Method used

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  • Modified starch and preparation method and application thereof
  • Modified starch and preparation method and application thereof
  • Modified starch and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0258] The structure of hydrophobic group in embodiment 1 starch binding agent is to the influence of binding agent and starch reaction

[0259] In this example, the reaction of starch binders with different structures and native starch (only cured, not modified) was tested.

[0260] Experimental steps: (1) take a cornstarch sample and prepare 7% "standard starch solution"; (2) take an appropriate amount of standard starch solution and dilute it with deionized water until the starch concentration is 1600mg / L; (3) take the prepared starch concentration Put 500mL of the solution in a beaker and put it into a preset constant temperature water bath at 45°C; (4) According to the concentration of the prepared starch complexing agent, add 3-30mg / L starch complexing agent to make the starch : Complexing agent weight ratio is 50: 1, reacts 30 minutes then, obtains modified starch solution; (5) sampling is centrifuged (4000x g) 5 minutes, gets supernatant liquid test starch content and ...

Embodiment 2

[0268] The impact of embodiment 2 reaction time on starch binding reaction

[0269] In this example, the effect of the reaction time of the starch binder and starch on the modified starch was investigated.

[0270] Experimental steps: (1) take a cornstarch sample and prepare 7% "standard starch solution"; (2) take an appropriate amount of standard starch solution and dilute it with deionized water until the starch concentration is 1800 mg / L (or other required concentration); (3 ) Take 500mL of the prepared starch solution or OCC white water, put it in a beaker, and put it in a 45°C constant temperature water bath, and equilibrate to the specified temperature; (4) Add 30mg / L starch binder as required, and when the reaction reaches 10 , 30, 60 and 120 minutes, the sample was centrifuged (4000x g) for 5 minutes, and the supernatant was taken to test the starch content and the COD concentration.

[0271] This embodiment tests multiple anionic starch complexing agents, and their r...

Embodiment 3

[0272] Embodiment 3 Reaction temperature is to the influence of starch binding reaction and the adsorption effect of modified starch

[0273] This embodiment examines the influence of reaction temperature on the reaction between starch binder and starch and the performance of modified starch (reaction product)

[0274] Experimental steps: (1) Take a cornstarch sample to prepare a 7% "standard starch solution"; (2) Take an appropriate amount of standard starch solution and dilute it with deionized water until the starch concentration is 600 mg / L; (3) Take the prepared starch solution 500mL, placed in a beaker, and placed in a constant temperature water bath with the required test temperature set in advance, and equilibrated to the specified temperature; (4) According to the test requirements, add 30mg / L anionic starch complexing agent A6, react for 60 minutes, Obtain the modified starch solution; (5) sample and centrifuge (4000x g) for 5 minutes, take the supernatant to test the ...

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Abstract

The invention relates to modified starch as well as a preparation method and application thereof. The modified starch is mainly prepared by reacting an anionic starch complexing agent with starch, wherein the chemical structure of the anionic starch complexing agent is composed of i) one or more hydrophobic groups, at least one of which is capable of reacting with starch to generate an inclusion complex, and ii) one or more hydrophilic groups, at least one of which is an anionic hydrophilic group; wherein the hydrophobic group and the hydrophilic group are respectively positioned at two ends of the same molecular structure and are connected through chemical bonds to form an asymmetric and polar structure. When the modified starch is used for papermaking, the adsorption rate of the starch on the fiber surface or in paper pulp can be increased, so that the retention rate of the starch in paper is increased, the strength of the paper can be improved, the loss of the starch in the pulpingand papermaking process is reduced or even eliminated, and the COD emission is reduced.

Description

technical field [0001] The invention relates to the technical field of papermaking and starch modification, in particular to a modified starch and its preparation method and application. Background technique [0002] Starch is a natural high-molecular carbohydrate that widely exists in seeds, stems or roots of plants. It is abundant in resources and low in price. It is widely used in industries such as industry, food, textiles, papermaking, feed, medicine, construction, and drilling. . Starch is one of the most important raw materials for papermaking. It is often the fourth largest component of paper and board by weight, after cellulose, inorganic fillers and moisture. Cultural and packaging paper and paper plates are major users of starch. The consumption of starch in the papermaking industry in the world is about 5 million tons, which is about 1.6% of the total output of papermaking and paper plates in the world. [0003] China's paper production has maintained rapid d...

Claims

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Application Information

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IPC IPC(8): D21H17/28
CPCD21H17/28Y02W30/64
Inventor 王祥槐张福山李志军胡维维刘波
Owner RISINGSTAR BIOTECH GUANGZHOU
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