A preparation method of etherification-oxidation-grafting multi-modified starch

Abstract

The invention discloses a method for preparing etherification-oxidation-grafting multi-modified starch. It uses original starch as raw material, adds etherifying agent, oxidant and composite catalyst, uses microwave semi-dry method to complete the etherification oxidation reaction in one step, and then uses The obtained etherified oxidized starch is used as raw material, initiator, alkaline catalyst and composite vinyl monomer are added, and the graft copolymerization is carried out in a microwave reactor using an open system method. This invention organically combines the three denaturation methods of etherification, oxidation, and grafting, and connects a variety of reactive groups to the starch molecular structure to maximize strengths and avoid weaknesses, and complement each other's advantages. By adjusting the process formula, a series of reactive group ratios can be obtained Multiple modified starches with different grafting rates. The product has various excellent properties of carboxymethyl etherification and / or hydroxyalkyl etherification, oxidation, and grafted starch, and can be used in papermaking, food, textiles, daily chemicals, polymer flocculants, highly absorbent materials, and oil fields. Chemical materials, degradable plastic films and plastics.

Description

Technical field

[0001] The invention belongs to the technical field of modified starch, and specifically relates to a preparation method of etherification-oxidation-grafting multi-component modified starch. Background technique

[0002] Multimodified starch refers to starch with two or more reactive groups such as anionic, cationic or nonionic groups connected to the same starch molecule. It is a new type of starch developed on the basis of single modified starch such as anionic, cationic and nonionic. The purpose of derivatives is to strengthen certain aspects of the performance of modified starch, making it more effective in practical applications, with wider usage conditions and wider application areas. By selecting different reactive groups, different ratios and different process conditions, multiple modified starch products with different special properties can be prepared. In recent years, many domestic starch scientific researchers have been active in the preparation...

Examples

Embodiment 1

[0034] 100 g of tapioca starch, 1.1 g of sodium carbonate, 1 g of sodium hydroxide, 0.02 g of copper sulfate, 1.5 g of hydrogen peroxide, and 5 g of chlorohydrin were fully mixed, and the obtained mixture was placed in a microwave reactor for microwave reaction. The microwave power was 320 W and the microwave time For 3 minutes, hydroxyethyl etherified oxidized starch was obtained; 0.13 g of sodium sulfite was added to reduce the residual oxidant, 25 g of sodium carbonate, 11 g of hydrogen peroxide-ferrous sulfate initiation system, 25 g of ethyl acetate, and 10 g of propylene acetate were added, and fully mixed. , the obtained mixture is placed in a microwave reactor to carry out the graft copolymerization reaction by the open system method, the microwave power is 240W, and the microwave time is 6 minutes, and the obtained product is post-treated to obtain the product of the present invention.

Embodiment 2

[0036] 100 g of tapioca starch, 18 g of sodium hydroxide, 0.05 g of copper sulfate, 4.5 g of hydrogen peroxide, and 45 g of chloroacetic acid were fully mixed, and the obtained mixture was placed in a microwave reactor for microwave reaction, the microwave power was 320 W, and the microwave time was 6 minutes to obtain Carboxymethyl etherification of oxidized starch; adding 0.2 g of sodium sulfite to reduce residual oxidant, adding 20 g of sodium carbonate, 10 g of potassium hydroxide, 17 g of hydrogen peroxide-ferrous sulfate initiation system, 45 g of vinyl acetate, and 12 g of methacrylic alcohol acetate, And fully mixed, the obtained mixture was placed in a microwave reactor to carry out the graft copolymerization reaction by the open system method, the microwave power was 240W, and the microwave time was 12 minutes.

Embodiment 3

[0038] 100 g of tapioca starch, 2.8 g of potassium hydroxide, 0.05 g of copper sulfate, 1 g of sodium persulfate, and 9 g of chloroethanol were fully mixed, and the obtained mixture was placed in a microwave reactor to carry out microwave reaction. The microwave power was 320 W, and the microwave time was 4 minutes. , to obtain hydroxyethyl etherified oxidized starch; add 0.35g of sodium bisulfite to reduce residual oxidant, add 22g of sodium carbonate, 12g of hydrogen peroxide-ferrous sulfate initiation system, 45g of propylene acetate, and 21g of methacrylic alcohol acetate, And fully mixed, the obtained mixture was placed in a microwave reactor to carry out the graft copolymerization reaction by the open system method, the microwave power was 240W, and the microwave time was 6 minutes.

Technical field

[0001] The invention belongs to the technical field of modified starch, and specifically relates to a preparation method of etherification-oxidation-grafting multi-component modified starch. Background technique

[0002] Multimodified starch refers to starch with two or more reactive groups such as anionic, cationic or nonionic groups connected to the same starch molecule. It is a new type of starch developed on the basis of single modified starch such as anionic, cationic and nonionic. The purpose of derivatives is to strengthen certain aspects of the performance of modified starch, making it more effective in practical applications, with wider usage conditions and wider application areas. By selecting different reactive groups, different ratios and different process conditions, multiple modified starch products with different special properties can be prepared. In recent years, many domestic starch scientific researchers have been active in the preparation...

Examples

Embodiment 1

[0034] 100 g of tapioca starch, 1.1 g of sodium carbonate, 1 g of sodium hydroxide, 0.02 g of copper sulfate, 1.5 g of hydrogen peroxide, and 5 g of chlorohydrin were fully mixed, and the obtained mixture was placed in a microwave reactor for microwave reaction. The microwave power was 320 W and the microwave time For 3 minutes, hydroxyethyl etherified oxidized starch was obtained; 0.13 g of sodium sulfite was added to reduce the residual oxidant, 25 g of sodium carbonate, 11 g of hydrogen peroxide-ferrous sulfate initiation system, 25 g of ethyl acetate, and 10 g of propylene acetate were added, and fully mixed. , the obtained mixture is placed in a microwave reactor to carry out the graft copolymerization reaction by the open system method, the microwave power is 240W, and the microwave time is 6 minutes, and the obtained product is post-treated to obtain the product of the present invention.

Embodiment 2

[0036] 100 g of tapioca starch, 18 g of sodium hydroxide, 0.05 g of copper sulfate, 4.5 g of hydrogen peroxide, and 45 g of chloroacetic acid were fully mixed, and the obtained mixture was placed in a microwave reactor for microwave reaction, the microwave power was 320 W, and the microwave time was 6 minutes to obtain Carboxymethyl etherification of oxidized starch; adding 0.2 g of sodium sulfite to reduce residual oxidant, adding 20 g of sodium carbonate, 10 g of potassium hydroxide, 17 g of hydrogen peroxide-ferrous sulfate initiation system, 45 g of vinyl acetate, and 12 g of methacrylic alcohol acetate, And fully mixed, the obtained mixture was placed in a microwave reactor to carry out the graft copolymerization reaction by the open system method, the microwave power was 240W, and the microwave time was 12 minutes.

Embodiment 3

[0038] 100 g of tapioca starch, 2.8 g of potassium hydroxide, 0.05 g of copper sulfate, 1 g of sodium persulfate, and 9 g of chloroethanol were fully mixed, and the obtained mixture was placed in a microwave reactor to carry out microwave reaction. The microwave power was 320 W, and the microwave time was 4 minutes. , to obtain hydroxyethyl etherified oxidized starch; add 0.35g of sodium bisulfite to reduce residual oxidant, add 22g of sodium carbonate, 12g of hydrogen peroxide-ferrous sulfate initiation system, 45g of propylene acetate, and 21g of methacrylic alcohol acetate, And fully mixed, the obtained mixture was placed in a microwave reactor to carry out the graft copolymerization reaction by the open system method, the microwave power was 240W, and the microwave time was 6 minutes.