Modified starch and its preparation method and application

Abstract

The present invention relates to a kind of modified starch and its preparation method and application, mainly prepared by starch aqueous solution and cationic starch complexing agent; The chemical structure of described cationic starch complexing agent is made up of the following parts: i) one or more hydrophobic Group, wherein at least one hydrophobic group can react with starch to generate an inclusion complex, and ii) one or more hydrophilic groups, wherein at least one hydrophilic group is a cationic hydrophilic group; The group and the hydrophilic group are respectively located at the two ends of the same molecular structure and connected by chemical bonds to form an asymmetric and polar structure. The use of the modified starch in papermaking can greatly increase the adsorption rate of starch on the fiber surface or in pulp, thereby increasing the retention rate of starch in paper, thereby improving the strength of paper, and reducing or even eliminating the adsorption of starch in the pulp and papermaking process. Loss, thereby reducing COD emissions.

Description

Technical field

[0001] The present invention relates to papermaking and starch modification techniques, and more particularly to a modified starch and a preparation method thereof. Background technique

[0002] Starch is a natural polymer carbohydrate, existing in seeds, stems or roots of plants, abundant resources, low price, widely used in industrial, food, textile, paper, feed, medicine, architecture, drilling and other industries . Starch is one of the most important raw materials on papermaking. From the weight, it is often the fourth largest component of paper and cardboard, second only to cellulose, inorganic filler and moisture. Culture and packaging paper and paper version are the main users of starch. The consumption of paper industrial starch in the world is about 5 million tons, according to the total output of world paper and paper, the amount of starch consumption is about 1.6%.

[0003] China's paper production has maintained rapid development in the past 30 years....

Examples

Embodiment 1

[0351] Example 1 Effect of cationic starch binding agent hexadalkylpyridine hydrochloric acid (number C7) to starch dissolution and fiber surface adsorption after binding reaction

[0352] Experimental step: (1) Take corn amyloid first to prepare 7% "standard starch solution"; (2) take a proper amount of standard starch solution to dilute the concentration of the desired starch solution; (3) take the preformed concentration The starch solution was 500 ml, placed in a beaker, and was placed in a constant temperature water bath 45 ° C, equilibrated to the specified temperature; (4) adding C7 in accordance with the desired concentration, reacting 60 minutes, modified starch solution; (5) Sampling centrifugation 4000X g) 5 minutes, take the supernatant test starch concentration; (6) Add bleaching chemical seizing (BKP) in the residual modified starch solution, maintaining the stirring time 10 minutes; (7) After the reaction, take The slurry was centrifuged (4000 x g) for 5 minutes, an...

Embodiment 2

[0358] Effect of Example 2 Reaction Time on Starch Binding Reaction

[0359]Experimental step of starch reaction: (1) Take corn amyloid first to prepare 7% "standard starch solution"; (2) Take a proper amount of standard starch solution to add ion water to the starch concentration of about 1800 mg / L (or other desired concentration) (3) Take the preformed concentration of starch solution 500ml or OCC white water, place the beaker, and put it into a 40 mg / L starch binding agent to the specified temperature; (4) to the designated temperature; (4) When the reaction reaches 1, 3, 5, 10, 30, 60, 90, 120, 300, 600 and 1200 minutes, sample centrifugation (4000 x g) for 5 minutes, take the supernatant test starch content and COD concentration;

[0360] Test step of the starch adsorption reaction time: Step (1) - (4) Suitress, (5) When the starch reaction reacted for 60 minutes, 3% chemical seizing (BKP) was added according to the required pulp concentration, stirred and started to adso...

Embodiment 3

[0365] Example 3 The reaction temperature on starch binding reaction and the effect of adsorption of modified starch

[0366] Experimental step: (1) Take a corn starch sample to prepare 7% "standard starch solution"; (2) Take a proper amount of standard starch solution to add ion water to the starch concentration of about 600 mg / L; (3) take the preformed concentration of starch solution 500ml, placed in a beaker, and put into a constant temperature water bath in advance to test the test temperature, equilibrate to the designated temperature; (4) Add 30 mg / L cation starch binding agent C7, react 60 minutes, Modified starch solution; (5) Sampling centrifugation (4000 x g) 5 minutes, take the supernatant test starch content and COD concentration; (6) Add chemical secting in the remaining modified starch solution (BKP) (Note: The amount of starch binding agent is equivalent to 1000 g / t sterilizing pulp), retains stir; (7) reaction for 10 minutes, penetrating centrifugation (4000...

Technical field

[0001] The present invention relates to papermaking and starch modification techniques, and more particularly to a modified starch and a preparation method thereof. Background technique

[0002] Starch is a natural polymer carbohydrate, existing in seeds, stems or roots of plants, abundant resources, low price, widely used in industrial, food, textile, paper, feed, medicine, architecture, drilling and other industries . Starch is one of the most important raw materials on papermaking. From the weight, it is often the fourth largest component of paper and cardboard, second only to cellulose, inorganic filler and moisture. Culture and packaging paper and paper version are the main users of starch. The consumption of paper industrial starch in the world is about 5 million tons, according to the total output of world paper and paper, the amount of starch consumption is about 1.6%.

[0003] China's paper production has maintained rapid development in the past 30 years....

Examples

Embodiment 1

[0351] Example 1 Effect of cationic starch binding agent hexadalkylpyridine hydrochloric acid (number C7) to starch dissolution and fiber surface adsorption after binding reaction

[0352] Experimental step: (1) Take corn amyloid first to prepare 7% "standard starch solution"; (2) take a proper amount of standard starch solution to dilute the concentration of the desired starch solution; (3) take the preformed concentration The starch solution was 500 ml, placed in a beaker, and was placed in a constant temperature water bath 45 ° C, equilibrated to the specified temperature; (4) adding C7 in accordance with the desired concentration, reacting 60 minutes, modified starch solution; (5) Sampling centrifugation 4000X g) 5 minutes, take the supernatant test starch concentration; (6) Add bleaching chemical seizing (BKP) in the residual modified starch solution, maintaining the stirring time 10 minutes; (7) After the reaction, take The slurry was centrifuged (4000 x g) for 5 minutes, an...

Embodiment 2

[0358] Effect of Example 2 Reaction Time on Starch Binding Reaction

[0359]Experimental step of starch reaction: (1) Take corn amyloid first to prepare 7% "standard starch solution"; (2) Take a proper amount of standard starch solution to add ion water to the starch concentration of about 1800 mg / L (or other desired concentration) (3) Take the preformed concentration of starch solution 500ml or OCC white water, place the beaker, and put it into a 40 mg / L starch binding agent to the specified temperature; (4) to the designated temperature; (4) When the reaction reaches 1, 3, 5, 10, 30, 60, 90, 120, 300, 600 and 1200 minutes, sample centrifugation (4000 x g) for 5 minutes, take the supernatant test starch content and COD concentration;

[0360] Test step of the starch adsorption reaction time: Step (1) - (4) Suitress, (5) When the starch reaction reacted for 60 minutes, 3% chemical seizing (BKP) was added according to the required pulp concentration, stirred and started to adso...

Embodiment 3

[0365] Example 3 The reaction temperature on starch binding reaction and the effect of adsorption of modified starch

[0366] Experimental step: (1) Take a corn starch sample to prepare 7% "standard starch solution"; (2) Take a proper amount of standard starch solution to add ion water to the starch concentration of about 600 mg / L; (3) take the preformed concentration of starch solution 500ml, placed in a beaker, and put into a constant temperature water bath in advance to test the test temperature, equilibrate to the designated temperature; (4) Add 30 mg / L cation starch binding agent C7, react 60 minutes, Modified starch solution; (5) Sampling centrifugation (4000 x g) 5 minutes, take the supernatant test starch content and COD concentration; (6) Add chemical secting in the remaining modified starch solution (BKP) (Note: The amount of starch binding agent is equivalent to 1000 g / t sterilizing pulp), retains stir; (7) reaction for 10 minutes, penetrating centrifugation (4000...

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