One-pot method for preparing high-nitrogen and potassium-containing superabsorbent resin using carboxymethyl potato starch and hydrogen peroxide as raw materials

Abstract

The invention discloses a method for preparing a high-nitrogen and potassium-containing superabsorbent resin in one pot by using carboxymethyl potato starch and hydrogen peroxide as raw materials. The main feature is that hydrogen peroxide oxidizes carboxymethyl potato starch without separation, washing and purification. , with acrylic acid and its potassium salt and acrylamide that have removed the polymerization inhibitor, heated in a water bath under nitrogen protection to synthesize a high-nitrogen, potassium-content superabsorbent resin in one pot. The best product has a maximum water absorption of 5000 times deionized water. 3500g / g, the highest nitrogen content can reach 13.1%, and the highest potassium content can reach 12.6%; the preparation of the superabsorbent resin of the present invention has the following advantages: hydrogen peroxide oxidation of carboxymethyl potato starch does not require traditional oxidation of carboxymethyl potato starch Separation, purification, washing; no need to add initiator, and the product obtained simultaneously has higher water absorption and nitrogen and potassium content, so the resin synthesized by the present invention has simple process, low cost, and excellent performance of the product, especially Because of its high water absorption and high nitrogen and potassium content, it is a good product that kills two birds with one stone when used in agriculture and gardening, and has good application and promotion value.

Description

technical field

[0001] The invention relates to a preparation method of a functional polymer material-superabsorbent resin used in the fields of industry, agriculture, medical sanitation, construction industry, environmental governance, etc. A method for synthesizing superabsorbent resin with high nitrogen and potassium content in one pot as the main raw material. Background technique

[0002] Superabsorbent resin is a new type of functional polymer material. Due to its unique water absorption and water retention properties, it has been widely used in medicine and health, agriculture, forestry and gardening, and desert control. The preparation of acrylic superabsorbent resin has a wide range of raw materials and a simple synthesis process. Starch belongs to the polymer of glucose, which is widely distributed in the seeds, roots and other tissues of many plants. It has a wide range of sources, and most of the plants that produce starch are renewable. The cost of raw materi...

Examples

Embodiment 1

[0027] Example 1: Weigh 5g of carboxymethyl potato starch and 30ml of deionized water and mix evenly, add 5ml of hydrogen peroxide and oxidize at 50°C for 2h, measure 10g (9.5ml) of acrylic acid (to remove the polymerization inhibitor); weigh 3.9g of KOH Dissolve in 10ml of deionized water, neutralize acrylic acid with the KOH solution prepared above under cooling in an ice-water bath; weigh 10g of acrylamide and dissolve it in 10ml of deionized water to prepare an acrylamide solution. Fully mix the neutralized acrylic acid and its salt solution and the prepared acrylamide solution with the oxidized carboxymethyl potato starch solution, add 4ml of N,N'-methylenebispropylene with a concentration of 2.5mg / ml Amide solution, in N 2 Under protection, heat slowly to increase the temperature of the system gradually. After the polymerization reaction starts, stop stirring, continue to raise the temperature slowly, keep it at 80°C for 2 hours, dry and pulverize to obtain the product. ...

Embodiment 2

[0028] Example 2: Weigh 5g of carboxymethyl potato starch and 30ml of deionized water and mix evenly, add 8ml of hydrogen peroxide and oxidize at 50°C for 2h, measure 10g (9.5ml) of acrylic acid (to remove the polymerization inhibitor); weigh 3.9g of KOH Dissolve in 10ml of deionized water, neutralize acrylic acid with the KOH solution prepared above under cooling in an ice-water bath; weigh 10g of acrylamide and dissolve it in 10ml of deionized water to prepare an acrylamide solution. Fully mix the neutralized acrylic acid and its salt solution and the prepared acrylamide solution with the oxidized carboxymethyl potato starch solution, add 4ml of N,N'-methylenebispropylene with a concentration of 2.5mg / ml Amide solution, in N 2 Under protection, heat slowly to increase the temperature of the system gradually. After the polymerization reaction starts, stop stirring, continue to raise the temperature slowly, keep it at 80°C for 2 hours, dry and pulverize to obtain the product. ...

Embodiment 3

[0029] Example 3: Weigh 5g of carboxymethyl potato starch and 30ml of deionized water and mix evenly, add 5ml of hydrogen peroxide and oxidize at 40°C for 2h, measure 10g (9.5ml) of acrylic acid (to remove the polymerization inhibitor); weigh 3.9g of KOH Dissolve in 10ml of deionized water, neutralize acrylic acid with the KOH solution prepared above under cooling in an ice-water bath; weigh 10g of acrylamide and dissolve it in 10ml of deionized water to prepare an acrylamide solution. Fully mix the neutralized acrylic acid and its salt solution and the prepared acrylamide solution with the oxidized carboxymethyl potato starch solution, add 4ml of N,N'-methylenebispropylene with a concentration of 2.5mg / ml Amide solution, in N 2 Under protection, heat slowly to increase the temperature of the system gradually. After the polymerization reaction starts, stop stirring, continue to raise the temperature slowly, keep it at 80°C for 2 hours, dry and pulverize to obtain the product. ...

technical field

[0001] The invention relates to a preparation method of a functional polymer material-superabsorbent resin used in the fields of industry, agriculture, medical sanitation, construction industry, environmental governance, etc. A method for synthesizing superabsorbent resin with high nitrogen and potassium content in one pot as the main raw material. Background technique

[0002] Superabsorbent resin is a new type of functional polymer material. Due to its unique water absorption and water retention properties, it has been widely used in medicine and health, agriculture, forestry and gardening, and desert control. The preparation of acrylic superabsorbent resin has a wide range of raw materials and a simple synthesis process. Starch belongs to the polymer of glucose, which is widely distributed in the seeds, roots and other tissues of many plants. It has a wide range of sources, and most of the plants that produce starch are renewable. The cost of raw materi...

Examples

Embodiment 1

[0027] Example 1: Weigh 5g of carboxymethyl potato starch and 30ml of deionized water and mix evenly, add 5ml of hydrogen peroxide and oxidize at 50°C for 2h, measure 10g (9.5ml) of acrylic acid (to remove the polymerization inhibitor); weigh 3.9g of KOH Dissolve in 10ml of deionized water, neutralize acrylic acid with the KOH solution prepared above under cooling in an ice-water bath; weigh 10g of acrylamide and dissolve it in 10ml of deionized water to prepare an acrylamide solution. Fully mix the neutralized acrylic acid and its salt solution and the prepared acrylamide solution with the oxidized carboxymethyl potato starch solution, add 4ml of N,N'-methylenebispropylene with a concentration of 2.5mg / ml Amide solution, in N 2 Under protection, heat slowly to increase the temperature of the system gradually. After the polymerization reaction starts, stop stirring, continue to raise the temperature slowly, keep it at 80°C for 2 hours, dry and pulverize to obtain the product. ...

Embodiment 2

[0028] Example 2: Weigh 5g of carboxymethyl potato starch and 30ml of deionized water and mix evenly, add 8ml of hydrogen peroxide and oxidize at 50°C for 2h, measure 10g (9.5ml) of acrylic acid (to remove the polymerization inhibitor); weigh 3.9g of KOH Dissolve in 10ml of deionized water, neutralize acrylic acid with the KOH solution prepared above under cooling in an ice-water bath; weigh 10g of acrylamide and dissolve it in 10ml of deionized water to prepare an acrylamide solution. Fully mix the neutralized acrylic acid and its salt solution and the prepared acrylamide solution with the oxidized carboxymethyl potato starch solution, add 4ml of N,N'-methylenebispropylene with a concentration of 2.5mg / ml Amide solution, in N 2 Under protection, heat slowly to increase the temperature of the system gradually. After the polymerization reaction starts, stop stirring, continue to raise the temperature slowly, keep it at 80°C for 2 hours, dry and pulverize to obtain the product. ...

Embodiment 3

[0029] Example 3: Weigh 5g of carboxymethyl potato starch and 30ml of deionized water and mix evenly, add 5ml of hydrogen peroxide and oxidize at 40°C for 2h, measure 10g (9.5ml) of acrylic acid (to remove the polymerization inhibitor); weigh 3.9g of KOH Dissolve in 10ml of deionized water, neutralize acrylic acid with the KOH solution prepared above under cooling in an ice-water bath; weigh 10g of acrylamide and dissolve it in 10ml of deionized water to prepare an acrylamide solution. Fully mix the neutralized acrylic acid and its salt solution and the prepared acrylamide solution with the oxidized carboxymethyl potato starch solution, add 4ml of N,N'-methylenebispropylene with a concentration of 2.5mg / ml Amide solution, in N 2 Under protection, heat slowly to increase the temperature of the system gradually. After the polymerization reaction starts, stop stirring, continue to raise the temperature slowly, keep it at 80°C for 2 hours, dry and pulverize to obtain the product. ...

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