Rapid water-absorbent resin with ultrahigh water absorption rate and high water retention and preparation method of rapid water-absorbent resin

Abstract

The invention discloses a rapid water-absorbent resin with ultrahigh water absorption and high water retention and a preparation method thereof, and the preparation method comprises the following steps: adding cassava residue into water, selecting KPS as an initiator, adding into a cassava starch mixture, and stirring for reaction in N2 atmosphere. And adding AA / AM and MBA into the mixture, and continuously stirring. The content of cassava starch in the cassava residues is 40-60%, the use amount of the cassava starch is 10% of AA / AM, the use amount of KPS is 2% of AA / AM, the mass ratio of AA to AM is 2: 1, and the use amount of MBA is 0.6% of AA / AM. The rapid water absorption resin material with the ultrahigh water absorption rate and the high water retention is obtained. The cassava starch and the cassava fiber can improve the three-dimensional network structure of the resin, so that the water absorption rate is improved. Wherein the cassava fibers are provided with porous channels, so that water absorption of the resin can be accelerated, and the water absorption speed is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of super absorbent resins, and in particular relates to a method for preparing a fast absorbent resin material with super high water absorption and high water retention. Background Art

[0002] Super absorbent resins (SPHs) have special properties that are superior to conventional water absorption and have been widely used in agriculture, medical materials, sanitary products, wastewater treatment and agriculture. How to improve the water absorption, water retention and sustained release of SPHs is a hot topic for many researchers. However, most traditional water absorbent resins have disadvantages such as low water absorption capacity, poor water retention and slow water absorption rate. It takes several hours or even dozens of hours for SPHs to reach a 100% swelling state, which seriously hinders the actual use efficiency of SPHs. Therefore, faster water absorption rate and good water absorption and water retention properties can bring more effective value to the practical application of SPHs. Cassava residue, as an agricultural waste with extremely low utilization rate, has a large amount of broken fibers, which is beneficial to regulate the structure of SPH. It also contains biodegradable components such as starch and lignin. This is conducive to SPHs to enhance the three-dimensional network cross-linked structure and improve performance. Therefore, cassava residue will become one of the most promising green materials for the preparation of SPHs in the future. The improvement of the structure and performance of SPHs materials is of great significance for the development of new agriculture in the future. Summary of the invention

[0003] In view of the shortcomings of the prior art, the object of the present invention is to provide a fast water-absorbing resin with ultra-high water absorption rate and high water retention and a preparation method thereof.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0005] In a first aspect, the present invention provides a method for preparing a fast water-absorbing resin with ultra-high water absorption rate and high water retention, comprising the following steps:

[0006] Cassava starch (CS) was added into water, and potassium persulfate (KPS) was selected as an initiator and added into the cassava starch mixture. 2 Stir and react under atmosphere. Then add acrylic acid and acrylamide mixture (AA / AM) and N,N-methylenebisacrylamide (MBA) and continue stirring. The amount of cassava starch is 5%-20% (mass ratio) of AA / AM, the amount of KPS is 1%-4% (mass ratio) of AA / AM, the mass ratio of AA to AM is 5:1-2:1, and the amount of MBA is 0.3%-0.9% (mass ratio) of AA / AM.

[0007] Preferably, cassava residue is added to water, KPS is selected as an initiator and added to the cassava starch mixture, 2Stir the reaction under the atmosphere. Then add AA / AM and MBA and continue stirring. The cassava starch content in the cassava residue is 40%-60%, the amount of cassava starch is 10% (mass ratio) of AA / AM, the amount of KPS is 2% (mass ratio) of AA / AM, the mass ratio of AA to AM is 2:1, and the amount of MBA is 0.6% of AA / AM.

[0008] The inventors have found through experiments that cassava residue contains a large amount of cassava starch and cassava fiber, which can enhance the three-dimensional network structure inside the resin, thereby increasing the water absorption rate and water retention rate of the resin. The cassava fiber exists in the form of a large number of fragments, which can be evenly distributed inside the super absorbent resin, and the cassava fiber contains a large number of pores, which can accelerate the external water to the inside of the resin through osmotic pressure, thereby improving the water absorption speed of the resin to achieve the performance of rapid water absorption.

[0009] Since cassava residue is a high-quality, low-cost agricultural waste and contains a large amount of biodegradable biomass components, the use of cassava residue to prepare fast-absorbing resins with ultra-high water absorption and high water retention has broad application prospects in the agricultural field.

[0010] In some embodiments, the initiator is selected from at least one of potassium persulfate or ammonium persulfate.

[0011] In some embodiments, the solvent is water.

[0012] In some embodiments, the cassava starch is prepared by crushing and sieving cassava residue.

[0013] In a second aspect, the present invention provides a fast water-absorbing resin material with ultra-high water absorption rate and high water retention, which is prepared by the preparation method.

[0014] In a third aspect, the present invention provides a fast water-absorbing resin with ultra-high water absorption rate and high water retention. The fast water-absorbing resin material with ultra-high water absorption rate and high water retention is obtained by washing, drying and crushing.

[0015] In some embodiments, the ultra-high water absorption rate and high water retention fast water absorbing resin material is crushed and then passed through a 20-mesh screen.

[0016] The beneficial effects achieved by one or more embodiments of the present invention are as follows:

[0017] Using cassava residue and AA / AM as raw materials, the cassava starch and cassava fiber in the cassava residue are initiated and cross-linked with each other, so that the prepared super absorbent resin has a better three-dimensional network structure, which can effectively improve the water absorption rate, water absorption rate and water retention. This super absorbent resin with super high water absorption rate and high water retention has a wider application market in the agricultural field.

[0018] Cassava residue comes from agricultural waste, is low-cost, biodegradable, and suitable for large-scale production of resin materials. DETAILED DESCRIPTION

[0019] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0020] Example 1

[0021] (1) Weigh 1.5 g of absolutely dry cassava residue (cassava starch content 40%) and gelatinize it in water at a temperature of 90° C. for 30 min;

[0022] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.12 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0023] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 2:1, the neutralization degree is 85%, the AA / AM amount is 6 g, and the MBA amount is 0.03 g, and reacting in a water bath at 70° C. and 200 rpm for 100 min;

[0024] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0025] Results: The water absorption rate of the obtained super absorbent resin was 728 g / g.

[0026] Example 2

[0027] (1) Weigh 1.33 g of absolutely dry cassava residue (45% cassava starch content) and gelatinize it in water at 90° C. for 30 min;

[0028] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.12 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0029] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 2:1, the neutralization degree is 85%, the AA / AM amount is 6 g, and the MBA amount is 0.03 g, and reacting in a water bath at 70° C. and 200 rpm for 100 min;

[0030] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0031] Results: The water absorption rate of the obtained super absorbent resin was 747 g / g.

[0032] Example 3

[0033] (1) Weigh 1.2 g of absolutely dry cassava residue (cassava starch content 50%) and gelatinize it in water at a temperature of 90° C. for 30 min;

[0034] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.12 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0035] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 2:1, the neutralization degree is 85%, the AA / AM amount is 6 g, and the MBA amount is 0.03 g, and reacting in a water bath at 70° C. and 200 rpm for 100 min;

[0036] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0037] Results: The water absorption rate of the obtained super absorbent resin was 762 g / g.

[0038] Example 4

[0039] (1) Weigh 1.09 g of absolutely dry cassava residue (cassava starch content 55%) and gelatinize it in water at a temperature of 90° C. for 30 min;

[0040] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.12 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0041] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 2:1, the neutralization degree is 85%, the AA / AM amount is 6 g, and the MBA amount is 0.03 g, and reacting in a water bath at 70° C. and 200 rpm for 100 min;

[0042] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0043] Results: The water absorption rate of the obtained super absorbent resin is 762g / g, the water absorption rate of NaCl salt solution (0.9%) is 66g / g, the water absorption rate of KCl salt solution (0.9%) is 72g / g, the water absorption rate of tap water is 276g / g, the water retention rate in 7 days is 375g / g, and the time to reach 100% swelling is 90min.

[0044] Example 5

[0045] (1) Weigh 1 g of absolutely dry cassava residue (cassava starch content 60%) and gelatinize it in water at a temperature of 90° C. for 30 min;

[0046] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.12 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0047] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 2:1, the neutralization degree is 85%, the AA / AM amount is 6 g, and the MBA amount is 0.03 g, and reacting in a water bath at 70° C. and 200 rpm for 100 min;

[0048] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0049] Results: The water absorption rate of the obtained super absorbent resin is 672g / g.

[0050] Comparative Example 1

[0051] (1) Weigh 0.3 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0052] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.06 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0053] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 5:1, the neutralization degree is 75%, the AA / AM amount is 6 g, and the MBA amount is 0.018 g, and the reaction is carried out in a water bath at 70° C. and 200 rpm for 100 min;

[0054] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0055] Result: The water absorption rate of the obtained super absorbent resin is 300g / g

[0056] Comparative Example 2

[0057] (1) Weigh 0.6 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0058] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.12 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0059] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 5:1, the neutralization degree is 80%, the AA / AM amount is 6 g, and the MBA amount is 0.03 g, and the reaction is carried out in a water bath at 70° C. and 200 rpm for 100 min;

[0060] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0061] Results: The water absorption rate of the obtained super absorbent resin is 351g / g

[0062] Comparative Example 3

[0063] (1) Weigh 0.9 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0064] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.18 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0065] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 5:1, the neutralization degree is 85%, the AA / AM amount is 6 g, and the MBA amount is 0.042 g, and the reaction is carried out in a water bath at 70° C. and 200 rpm for 100 min;

[0066] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0067] Results: The water absorption rate of the obtained super absorbent resin is 272g / g

[0068] Comparative Example 4

[0069] (1) Weigh 1.2 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0070] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.24 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0071] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 5:1, the neutralization degree is 90%, the AA / AM amount is 6 g, and the MBA amount is 0.054 g, and the reaction is carried out in a water bath at 70° C. and 200 rpm for 100 min;

[0072] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0073] Results: The water absorption rate of the obtained super absorbent resin is 222g / g

[0074] Comparative Example 5

[0075] (1) Weigh 1.2 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0076] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.12 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0077] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 4:1, the neutralization degree is 85%, the AA / AM amount is 6 g, and the MBA amount is 0.018 g, and the reaction is carried out in a water bath at 70° C. and 200 rpm for 100 min;

[0078] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0079] Results: The water absorption rate of the obtained super absorbent resin is 354g / g

[0080] Comparative Example 6

[0081] (1) Weigh 0.9 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0082] (2) The gelatinized starch treated in step (1) is initiated and placed in N2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.06 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0083] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 4:1, the neutralization degree is 90%, the AA / AM amount is 6 g, and the MBA amount is 0.03 g, and the reaction is carried out in a water bath at 70° C. and 200 rpm for 100 min;

[0084] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0085] Result: The water absorption rate of the obtained super absorbent resin is 300g / g

[0086] Comparative Example 7

[0087] (1) Weigh 0.6 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0088] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.24 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0089] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 4:1, the neutralization degree is 75%, the AA / AM amount is 6 g, and the MBA amount is 0.042 g, and reacting in a water bath at 70° C. and 200 rpm for 100 min;

[0090] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0091] Results: The water absorption rate of the obtained super absorbent resin is 274g / g

[0092] Comparative Example 8

[0093] (1) Weigh 0.3 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0094] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.18 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0095] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 4:1, the neutralization degree is 80%, the AA / AM amount is 6 g, and the MBA amount is 0.054 g, and the reaction is carried out in a water bath at 70° C. and 200 rpm for 100 min;

[0096] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0097] Results: The water absorption rate of the obtained super absorbent resin is 240g / g

[0098] Comparative Example 9

[0099] (1) Weigh 0.6 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0100] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.18 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0101] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 3:1, the neutralization degree is 90%, the AA / AM amount is 6 g, and the MBA amount is 0.018 g, and the reaction is carried out in a water bath at 70° C. and 200 rpm for 100 min;

[0102] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0103] Results: The water absorption rate of the obtained super absorbent resin is 309g / g

[0104] Comparative Example 10

[0105] (1) Weigh 0.3 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0106] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.24 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0107] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 3:1, the neutralization degree is 85%, the AA / AM amount is 6 g, and the MBA amount is 0.03 g, and reacting in a water bath at 70° C. and 200 rpm for 100 min;

[0108] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0109] Results: The water absorption rate of the obtained super absorbent resin is 270g / g

[0110] Comparative Example 11

[0111] (1) Weigh 1.2 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0112] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.06 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0113] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 3:1, the neutralization degree is 80%, the AA / AM amount is 6 g, and the MBA amount is 0.042 g, and the reaction is carried out in a water bath at 70° C. and 200 rpm for 100 min;

[0114] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0115] Results: The water absorption rate of the obtained super absorbent resin is 219g / g

[0116] Comparative Example 12

[0117] (1) Weigh 0.9 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0118] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.12 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0119] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 3:1, the neutralization degree is 75%, the AA / AM amount is 6 g, and the MBA amount is 0.054 g, and the reaction is carried out in a water bath at 70° C. and 200 rpm for 100 min;

[0120] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0121] Results: The water absorption rate of the obtained super absorbent resin is 234g / g

[0122] Comparative Example 13

[0123] (1) Weigh 0.9 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0124] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.24 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0125] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 2:1, the neutralization degree is 80%, the AA / AM amount is 6 g, and the MBA amount is 0.018 g, and the reaction is carried out in a water bath at 70° C. and 200 rpm for 100 min;

[0126] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0127] Results: The water absorption rate of the obtained super absorbent resin is 282g / g

[0128] Comparative Example 14

[0129] (1) Weigh 1.2 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0130] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.18 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0131] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 2:1, the neutralization degree is 75%, the AA / AM amount is 6 g, and the MBA amount is 0.03 g, and reacting in a water bath at 70° C. and 200 rpm for 100 min;

[0132] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0133] Results: The water absorption rate of the obtained super absorbent resin is 361g / g

[0134] Comparative Example 15

[0135] (1) Weigh 0.3 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0136] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.12 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0137] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 2:1, the neutralization degree is 90%, the AA / AM amount is 6 g, and the MBA amount is 0.042 g, and reacting in a water bath at 70° C. and 200 rpm for 100 min;

[0138] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0139] Results: The water absorption rate of the obtained super absorbent resin is 370g / g

[0140] Comparative Example 16

[0141] (1) Weigh 0.6 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0142] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.06 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0143] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 2:1, the neutralization degree is 85%, the AA / AM amount is 6 g, and the MBA amount is 0.054 g, and the reaction is carried out in a water bath at 70° C. and 200 rpm for 100 min;

[0144] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0145] Results: The water absorption rate of the obtained super absorbent resin is 319g / g

[0146] Comparative Example 17

[0147] (1) Weigh 0.6 g of absolute dry cassava starch and gelatinize it in water at a temperature of 90° C. for 30 min;

[0148] (2) The gelatinized starch treated in step (1) is initiated and placed in N 2 Under the atmosphere, KPS was added in an aqueous solution with a dosage of 0.12 g, and reacted in a water bath at 70 °C and 200 rpm for 10 min;

[0149] (3) adding the mixed solution treated in step (2) to the AA / AM mixed solution and MBA for cross-linking treatment, wherein the AA / AM ratio is 2:1, the neutralization degree is 85%, the AA / AM amount is 6 g, and the MBA amount is 0.3 g, and the reaction is carried out in a water bath at 70° C. and 200 rpm for 100 min;

[0150] (4) washing the super absorbent resin obtained in step (3) with water and ethanol, and drying and crushing the washed sample;

[0151] Results: The water absorption rate of the obtained super absorbent resin is 538g / g, the water absorption rate of NaCl salt solution (0.9%) is 62g / g, the water absorption rate of KCl salt solution (0.9%) is 69g / g, the water absorption rate of tap water is 268g / g, the water retention rate in 7 days is 253g / g, and the time to reach 100% swelling is 120min.

[0152] It should be understood that the above detailed description of the technical solution of the present invention with the help of optimized embodiments is illustrative rather than restrictive, and it cannot be determined that the specific implementation methods of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, modifications to the technical solutions recorded in the embodiments, or equivalent replacement of some of the technical features therein, should be deemed to fall within the scope of patent protection determined by the claims submitted for the present invention.

[0153] The above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for preparing a fast water-absorbing resin with ultra-high water absorption rate and high water retention, Features: The steps include: adding cassava starch into water, selecting KPS as an initiator and adding it into the cassava starch mixture, 2 The mixture is stirred to react under an atmosphere; then acrylic acid and acrylamide mixture AA / AM and MBA are added thereto and stirring is continued; the amount of cassava starch is 5%-20% of the acrylic acid and acrylamide mixture AA / AM, the amount of KPS is 1%-4% of the acrylic acid and acrylamide mixture AA / AM, the mass ratio of AA to AM is 5:1-2:1, and the amount of MBA is 0.3%-0.9% of AA / AM.

2. The method for preparing the super-high water absorption and high water retention fast water-absorbing resin material according to claim 1, Features: The cassava starch content in the cassava residue is 40%-60%.

3. The method for preparing the super-high water absorption and high water retention fast water-absorbing resin material according to claim 1, Features: The amount of cassava starch used is 10% of the mixed solution of acrylic acid and acrylamide AA / AM.

4. The method for preparing the fast water-absorbing resin material with super high water absorption rate and high water retention according to claim 1, Features: The dosage of KPS is 2% of the mixture of acrylic acid and acrylamide AA / AM.

5. The method for preparing the fast water-absorbing resin material with super high water absorption rate and high water retention according to claim 1, Features: The mass ratio of AA to AM is 2:

1.

6. The method for preparing the fast water-absorbing resin material with super high water absorption rate and high water retention according to claim 1, Features: The dosage of MBA is 0.6% of AA / AM.

7. The method for preparing the fast water-absorbing resin material with super high water absorption rate and high water retention according to claim 1, Features: The initiator is selected from at least one of potassium persulfate or ammonium persulfate.

8. The method for preparing the fast water-absorbing resin material with super high water absorption rate and high water retention according to claim 1, Features: The solvent is water.

9. The method for preparing the fast water-absorbing resin material with super high water absorption rate and high water retention according to claim 1, Features: The cassava starch and cassava residue are obtained by filtering through a 100-mesh sieve.

10. A fast water-absorbing resin material with super high water absorption rate and high water retention, Features: Prepared by the preparation method described in any one of claims 1 to 9.