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Modified starch, 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 the impact of wastewater biological treatment, affecting operating efficiency, and paper defects

Active Publication Date: 2021-04-16
RISINGSTAR BIOTECH GUANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] However, there are some deficiencies in the above-mentioned technologies: in order to prevent the shortening of starch chains, microorganisms must be fully and effectively controlled to prevent them from secreting amylase. These methods require the addition of a large amount of fungicides, which will affect the subsequent biological treatment of wastewater.
In addition, because the starch in papermaking white water mainly comes from surface sizing, its starch molecular weight is low, it is uncharged, and it is difficult to retain it in the paper, resulting in a large amount of starch remaining in the pulping and papermaking system. These starches not only serve as Microbial nutrients will increase microbial growth, and starch accumulation will eventually cause "starch sticky" deposition problems, resulting in paper defects and end breaks, affecting operational efficiency
[0027] So far, there is no real effective solution to the recycling of starch dissolved in papermaking white water

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0562] The structure of embodiment 1 starch binding agent is on the influence of binding agent and starch reaction

[0563] In this example, the reaction of starch binders shown in Table 1 with raw starch (only cured, not modified) was tested.

[0564] 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, and the pH of the obtained solution is between 6.7- Between 7.1; (3) Take 500mL of the prepared starch solution, put it in a beaker, and put it into a preset constant temperature water bath at 45°C; (4) Depending on the concentration of the prepared starch complexing agent, Add 3-30mg / L starch complexing agent so that the starch:complexing agent weight ratio is 50:1, then react for 30 minutes to obtain a modified starch solution; (5) sample and centrifuge (4000x g) for 5 minutes, take the supernatant (...

Embodiment 2

[0568] Embodiment 2 Reaction pH is to the reaction of starch binding agent and starch and the influence to the adsorption effect of modified starch

[0569] In this example, the effect of solution pH on the reaction between starch binder and starch and the performance of modified starch (reaction product, modified starch) was investigated.

[0570] Experimental steps: (1) take a cornstarch sample and 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 600mg / L, and the pH of the obtained local solution is 6.7 Between -7.1; (3) Take 500mL of the prepared starch solution, put it in a beaker, and put it into a preset constant temperature water bath at 45°C, and adjust the pH of the starch solution by adding hydrochloric acid or sodium hydroxide; (4 ) adding gemini structure starch complexing agent to its solution concentration to 30mg / L (i.e. the mass ratio of starc...

Embodiment 3

[0574] Embodiment 3 The influence of reaction temperature on starch binding reaction and the adsorption effect of modified starch

[0575] Experimental steps: (1) Take corn starch samples to prepare 7% "standard starch solution"; (2) Take an appropriate amount of standard starch solution and add deionized water to dilute to a starch concentration of about 600mg / 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) Add the Gemini starch complexing agent until the solution concentration reaches 30mg / L (that is, starch and starch The mass ratio of the complexing agent is 20:1), reacted for 60 minutes to obtain a modified starch solution (reaction pH between 6.5-7.0); (5) sample was centrifuged (4000x g) for 5 minutes, and the supernatant was taken to test the starch (6) Add chemical pulp (BKP) to the remaining modified...

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Abstract

The invention relates to modified starch, a preparation method and application thereof. The modified starch is mainly prepared from starch and a starch complexing agent, wherein the chemical structure of the starch complexing agent comprises two or more than two identical structural monomers, the two structural monomers are connected through chemical groups or chemical bonds, and the chemical structure of the structural monomer comprises the following parts: i) one or more hydrophobic groups, wherein the hydrophobic groups are all located at the tail end of the molecular structure, and at least one hydrophobic group can react with starch to generate an inclusion complex, and ii) one or more hydrophilic groups. When the modified starch is used for papermaking, the adsorption rate of the starch on the fiber surface or in paper pulp can be greatly improved, so that the retention rate of the starch in paper is improved, the strength of the paper can be improved, the loss of the starch in the pulping and 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): C08B31/00C08G81/00C08J11/04D21H17/28D21H21/18D21H23/04C02F1/00C08L3/02C02F103/28
CPCY02W30/62Y02P20/143
Inventor 王祥槐李志军胡维维刘波张福山
Owner RISINGSTAR BIOTECH GUANGZHOU
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