Preparation of Straw Superabsorbent Composite Material by Microwave Method

2013 ◽  
Vol 873 ◽  
pp. 337-343
Author(s):  
Lian Wei Yang ◽  
Rui Jie Wang
Keyword(s):  
Composite Material ◽  
Acrylic Acid ◽  
Water Retention ◽  
Salt Water ◽  
High Water ◽  
Sodium Acrylate ◽  
Microwave Method ◽  
Water Absorbency ◽  
Distilled Water ◽  
Preparation Conditions

By microwave method, a superabsorbent function composite material was prepared by grafting sodium acrylate onto straw flour using potassium persalfate (K2S2O8) and N, N'-methylene bis acrylamide as an initiator and crosslinker, respectively. The effect of various preparation conditions on its water absorbency was investigated. When the straw flour content was 6%, the acrylic acid content was 20.0g, the amount of initiator was 0.4%, the neutralization degree of monomer was 80%, the reaction temperature was 70°C and the amount of crosslinker was 0.05%, the materials absorbency was 1360 times in distilled water and 152 times in 0.9% salt-water at ambient temperature. It had also high water retention. The analyses of SEM indicate that sodium acrylate is grafted on the polysaccharides of straw flour.

Preparation and Swelling Properties of P(AMPS-co-AM)/ Attapulgite Clay Superabsorbent Composite by Microwave Irradiation

2012 ◽  
Vol 512-515 ◽  
pp. 2394-2398 ◽  
Author(s):  
Ji Hong Xu ◽  
De Xin Tan ◽  
Ling Yan Yan ◽  
Zhong Li
Keyword(s):  
Microwave Irradiation ◽  
Microwave Power ◽  
Water Retention ◽  
Salt Water ◽  
Absorption Capacity ◽  
Water Absorbency ◽  
Swelling Properties ◽  
Superabsorbent Composite ◽  
Speed Up ◽  
Attapulgite Clay

A novel poly(2-acrylamido-2-methylpropa-nesulfonicacid-co-acrylamide) / attapulgite (P(AMPS-co-AM)/APT) high-salt superabsorbent composite was synthesized through graft polymerization in aqueous solution by microwave irradiation. The structure of the composite was characterized by infrared spectra (FTIR).The influence of the content of monomer, microwave power and the ratio of attapulgite clay on water absorbency was investigated. The swelling behaviors and the water retention of Superabsorbent resin with different APT content were also examined. The results show that the graft copolymerization took place between APT and organic monomers. Adding an appropriate amount of APT in resin can effectively improve the absorption capacity and salt-water performance. Microwave power is 390W, APT amount is 7.5% (mass fraction),The water absorbency of resin in distilled water and 0.9wt% NaCl were 1460g / g and 114 g / g. The resin has a faster absorption rate and strong water retention, the appropriate increase the amount of APT can significantly speed up the rate of the resin absorbent and improve its water retention.

scholarly journals Fabrication of Eco-Friendly Superabsorbent Composites Based on Waste Semicoke

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2347
Author(s):  
Yongsheng Wang ◽  
Yongfeng Zhu ◽  
Yan Liu ◽  
Aiqin Wang
Keyword(s):  
Acrylic Acid ◽  
Ph Value ◽  
High Water ◽  
Sem Analysis ◽  
Water Absorbency ◽  
Ammonium Persulphate ◽  
Wide Ph Range ◽  
Maximum Water ◽  
Ph Range ◽  
Superabsorbent Composites

A series of novel superabsorbent composites of poly(acrylic acid)/semicoke were prepared by polymerization of acrylic acid using ammonium persulphate as initiator, N,N′-methylenebisacrylamide as crosslinker and semicoke which was the by-product of coal carbonizing as the inorganic components. FTIR and SEM analysis indicated that the superabsorbent composites had been successfully polymerized and the semicoke participated in construction of the 3D polymeric network. Meanwhile, the effects of initiator, crosslinker, semicoke, and neutralization degree, as well as the pH value, were investigated, and the results showed that superabsorbent composites containing 10% of semicoke possessed the maximum water absorbency of 584 g/g in distilled water and 75 g/g in 0.9% NaCl solution. The superabsorbent composites kept the high water absorbency within a wide pH range of 4–11, and still exhibited better re-swelling capability even after seven times. The superabsorbent composite with its excellent performance is a potential water-retaining agent used in agriculture.

The Preparation of Calcium Carbonate Modified High Water-Absorbing Resin

2014 ◽  
Vol 1035 ◽  
pp. 296-302
Author(s):  
Qi Shi ◽  
Qing Luo Meng ◽  
Nong Wang
Keyword(s):  
Calcium Carbonate ◽  
Acrylic Acid ◽  
Dry Weight ◽  
High Water ◽  
Ammonium Persulfate ◽  
Sodium Acrylate ◽  
Cross Linking ◽  
Optimum Process ◽  
Process Conditions ◽  
Modified Resin

The poly (sodium acrylate/acrylic acid) water-absorbing resin was prepared by aqueous solution polymerization with acrylic acid (AA) as the monomer, calcium carbonate as the modified additives, N, N-methylene double acrylamide (NMBA) as cross-linking agent, ammonium persulfate (APS)/sodium sulfite oxidation reduction type initiator. It was found that the adsorption performance of absorbent resin modified by calcium carbonate strengthened obviously. Orthogonal and single factor experiment were used to establish the optimum parameters related to the product preparation. The best process conditions on water-absorbing properties of the modified resin was obtained. Using 150mL acrylic acid as a benchmark, the result show the optimum process conditions: the reaction temperature is 55°C, the mass fraction of monomer is 20%, the neutralization degree is 45%, modified additive dosage is 10 g, the dosage of cross-linking agent is 0.1%, and the initiator dosage is 2.0%, respectively. After made under the optimum process conditions, the water-absorbing rate of the modified resin was 676.6 times the dry weight.

Preparation and Performance of Super-Absorbent Resin Using Polyacrylonitrile Fiber Wastes

2015 ◽  
Vol 1120-1121 ◽  
pp. 498-501
Author(s):  
Kun Yan Wang ◽  
Ru Feng Cen ◽  
Wen Wen Shu
Keyword(s):  
Water Retention ◽  
Polyacrylonitrile Fiber ◽  
Water Absorbency ◽  
Distilled Water ◽  
Weight Loss Step ◽  
Pan Fiber ◽  
New Material ◽  
Cross Linker ◽  
And Performance ◽  
Pan Fibers

In order to develop a new way for utilizing Polyacrylonitril (PAN) fiber wastes, a super-absorbent resin was prepared using the waste of PAN fibers at alkaline hydrolysis condition with Al3+ as cross-linker. The molecular structure of the super-absorbent resin was confirmed by FTIR. The thermal degradation of super-absorbent resin consisted of one main weight loss step. Factors that can influence absorbencies of the super-absorbent resin were investigated, such as the amount of cross-linker. The super-absorbent resin has the water absorbency of 131g/g in distilled water. The super-absorbent resin can be used as a new material to water retention from the soil in agriculture.

Synthesis and swelling behaviour of fast-swelling superabsorbent composites

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Fen Zhang ◽  
Mingzhu Liu ◽  
Xiaohua Qi ◽  
Zhenbin Chen
Keyword(s):  
High Water ◽  
Sodium Acrylate ◽  
Swelling Kinetics ◽  
Water Absorbency ◽  
High Porosity ◽  
Nacl Solution ◽  
Experimental Conditions ◽  
Swelling Equilibrium ◽  
Swelling Rate ◽  
Superabsorbent Composites

AbstractFast-swelling porous superabsorbent composites with high water absorbency in 0.9 wt% NaCl solution both at atmospheric pressure and under certain load (p ≈ 2×103 pa) were synthesized by a rapid solution polymerization of concentrated sodium acrylate, acrylamide and 2-hydroxypropyl acrylate. The porosity was induced through foaming conducted in the course of polymerization using acetone as porosity generator. The copolymerization and surface morphology of the porous copolymers were characterized by FTIR and SEM. To improve other properties of swollen hydrogel such as strength, resilience and dispersion, the copolymers were modified with inorganic salts after surfacecrosslinking by trihydroxymethyl propane glycidol ether. The influences of various experimental conditions, such as neutralization degree of acrylic acid, amount of initiator and crosslinker on the water absorbent capacity in 0.9 wt% NaCl solution were investigated. The resulting products under optimum conditions possessed the water absorbency of 65 g g-1 and 10 g g-1 in 0.9 wt% NaCl solution at atmosphere pressure and under load, respectively. The results of swelling kinetics measurement in 0.9 wt% NaCl solution showed that the composites had very fast swelling rate (they can reach swelling equilibrium in minutes). In addition, the effect of amount of acetone on swelling rate of the composites was examined in detail. It was shown that appropriate amount of acetone caused products with high porosity, which led to large swelling rate. Moreover, the swollen hydrogel exhibited excellent strength, better resilience and dispersion.

scholarly journals UV polymerization and property analysis of maleacylated methyl cellulose acrylic acid absorbent resin

2020 ◽  
Vol 22 (2) ◽  
pp. 34-41
Author(s):  
Ying Li ◽  
Amatjan Sawut ◽  
Gongbo Hou ◽  
Mingyu He ◽  
Mamatjan Yimit
Keyword(s):  
Acrylic Acid ◽  
Water Absorption ◽  
Water Retention ◽  
Methyl Cellulose ◽  
High Water ◽  
Optimal Conditions ◽  
Synthetic Resin ◽  
Reaction Conditions ◽  
High Water Absorption ◽  
Maximum Water

AbstractIn this paper, maleic anhydride (MA) was grafted onto methyl cellulose (MC) and then reacted with acrylic acid to synthesize a high gel strength and fast water absorption resin (AA-co-MC-g-MA) by UV polymerization. The reaction conditions of maleylated methylcellulose (MC-g-MA) were investigated, including the ratio of MC to MA, reaction time and catalyst amount. In addition, the reaction conditions for the synthesis of super absorbent resin were as follows: the amount of MC-g-MA, the degree of substitution of MC-g-MA, polymerization time, and the amount of initiator. Under optimal conditions, the maximum water absorption volume of synthetic resin was 2116 g/g, and the maximum salt absorption rate was 139 g/g. The water absorption resin prepared this time had high water absorption, water retention, excellent pH sensitivity, etc. It was hoped that it will have a good application prospect in the field of industrial production and agriculture in the future.

Effect of Crosslinker Type on the Properties of Surface-Crosslinked Poly(sodium acrylate) Superabsorbents

2014 ◽  
Vol 936 ◽  
pp. 89-94 ◽  
Author(s):  
Yun Xiong ◽  
Xu Zhang ◽  
Ming Zhu Liu
Keyword(s):  
Aqueous Solution ◽  
Compressive Strength ◽  
Atmospheric Pressure ◽  
Water Retention ◽  
Salt Resistance ◽  
Sodium Acrylate ◽  
Water Absorbency ◽  
Glycol Dimethacrylate ◽  
Pentaerythritol Triacrylate ◽  
Swelling Behaviors

A series of poly (sodium acrylate) superabsorbents hydrogels were synthesized through aqueous solution using N,N-methylenebisacrylamide (NNMBA), pentaerythritol triacrylate (PETA), ethylene glycol dimethacrylate (EGDMA) and dimethyl diallyl ammonium chloride (DMDAAC) as crosslink agents separately to investigate the effect of crosslinker type on the properties of acrylic-based superabsorbents. Furthermore, the polymers were surface-crosslinked using trimethylolpropane triglycidyl ether to improve the properties of swollen hydrogel. The morphology of the samples was characterized by scanning electron microscope (SEM). The swelling behaviors in 0.9 wt% NaCl aqueous solution and synthetic urine were investigated, and the compressive strength, salt sensitivity and water retention ability were also investigated. The results showed that the superabsorbent crosslinked by PETA which was a three-functional agent had the most water absorbency under load and the highest compressive strength compared with others, while the superabsorbent crosslinked by DMDAAC which was a cationic crosslinker had the best salt resistance and the most water absorbency under atmospheric pressure.

Preparation, Swelling and Water-Retention Properties of Crosslinked Superabsorbent Hydrogels Based on Guar Gum

2010 ◽  
Vol 96 ◽  
pp. 177-182 ◽  
Author(s):  
Wen Bo Wang ◽  
Ai Qin Wang
Keyword(s):  
Acrylic Acid ◽  
Water Retention ◽  
Guar Gum ◽  
Weight Ratio ◽  
Ammonium Persulfate ◽  
Sodium Acrylate ◽  
Swelling Properties ◽  
Superabsorbent Hydrogel ◽  
Water Retention Properties ◽  
Superabsorbent Hydrogels

Utilization of natural polymer as matrix for preparing hydrogels can improve the performance of the materials and render them environmentally friendly. In this work, the guar gum-g-poly(sodium acrylate) (GG-g-PNaA) superabsorbent hydrogels were prepared by the solution graft copolymerization of natural guar gum (GG) with partially neutralized acrylic acid (NaA) using ammonium persulfate (APS) as initiator and N,N′-methylenebisacrylamide (MBA) as crosslinker. FTIR spectra confirmed that NaA had been grafted on GG chains. The effects of reaction variables including the concentration of APS and MBA, the weight ratio of acrylic acid (AA) to GG and the neutralization degree of AA on water absorption were investigated. The superabsorbent hydrogel prepared under optimal condition gives the best absorption of 1107 g∙g–1 in distilled water and 88 g∙g–1 in 0.9 wt% NaCl solution. Effects of external pH on the swelling properties of hydrogels were investigated, and the practical water retention properties of the hydrogels were also evaluated. Results indicated that the hydrogels exhibited excellent pH-stability in a wide pH range from 4 to 11, and the water-retention capabilities of sand soils were also greatly improved after utilizing the superabsorbent hydrogels. This superabsorbent hydrogels could be used as potential eco-friendly water-saving materials for agricultural or ecological application.

scholarly journals Preparation of a low-cost and eco-friendly superabsorbent composite based on wheat bran and laterite for potential application in Chinese herbal medicine growth

2018 ◽  
Vol 5 (5) ◽  
pp. 180007 ◽  
Author(s):  
Jiande Gao ◽  
Jin Liu ◽  
Hui Peng ◽  
Yaya Wang ◽  
Sha Cheng ◽  
...  
Keyword(s):  
Herbal Medicine ◽  
Acrylic Acid ◽  
Chinese Herbal Medicine ◽  
Wheat Bran ◽  
Water Retention ◽  
Low Cost ◽  
Water Retention Capacity ◽  
Water Absorbency ◽  
Chinese Herbal ◽  
Superabsorbent Composite

A low-cost and eco-friendly superabsorbent composite is prepared through the free-radical graft co-polymerization of wheat bran (WB), acrylic acid (AA) and laterite (LA) in an aqueous solution. Elemental map, scanning electron microscopy and Fourier transform infrared spectra revealed that the LA evenly distributed in the superabsorbent composite and wheat bran-g-poly(acrylic acid)/laterite (WB-g-PAA/LA) formed successfully. Thermogravimetric analysis confirmed that the WB-g-PAA/LA had high thermal stability. Furthermore, the properties of the WB-g-PAA/LA, such as swelling in saline solutions and degradation, are also assessed. The final WB-g-PAA/LA (5 wt%) superabsorbent composite attained an optimum water absorbency of 1425 g g −1 in distilled water and 72 g g −1 in 0.9 wt% NaCl solution. The water absorbency of WB-g-PAA/LA (10 wt%) is even greater than that of the WB-g-PAA. Moreover, the water-retention capacity of WB-g-PAA/LA (5 wt%) is high, and the water-retention process followed a zero-order reaction. The reaction rate constant is 8.2428 × 10 5 exp(− E a /RT ) and the apparent activation energy ( E a ) is 35.11 kJ mol −1 . Furthermore, WB-g-PAA/LA (5 wt%) may regulate the release of urea, indicating that the superabsorbent composite could provide a promising application as a urea fertilizer carrier. Additionally, it increased the germination and growth rates of Glycyrrhiza uralensis Fisch, suggesting it could influence the growth of Chinese herbal medicine.

Synthesis and Characterization of a Novel Superabsorbent Polymer Based on Konjac Glucomannan

2010 ◽  
Vol 148-149 ◽  
pp. 1567-1570
Author(s):  
Ai Xia Lu ◽  
Yang Luo ◽  
Xue Gang Luo ◽  
Jian Ye
Keyword(s):  
Acrylic Acid ◽  
Graft Polymerization ◽  
Konjac Glucomannan ◽  
Synthesis And Characterization ◽  
Water Absorbency ◽  
Distilled Water ◽  
Superabsorbent Polymer ◽  
Nacl Solution ◽  
Factors Influencing

A novel konjac glucomannan-g-poly(acrylic acid) superabsorbent with water absorbency of 380.8g/g in distilled water and 54.3 g/g in 0.9 wt% NaCl solution was prepared by graft polymerization with konjac glucomannan and acrylic acid in aqueous solution, using N, N’- methylene bisacrylamide as a crosslinker and potassium persulfate as an initiator. Factors influencing water absorbency of the superabsorbent polymer were investigated, such as the neutralization degree of acrylic acid, the amount of crosslinker and initiator.

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