scholarly journals Water-Preserving and Salt-Resistant Slow-Release Fertilizers of Polyacrylic Acid-Potassium Humate Coated Ammonium Dihydrogen Phosphate

Polymers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2844
Author(s):  
Hongping Li ◽  
Lanwen Yang ◽  
Jianxin Cao ◽  
Chenchen Nie ◽  
Hao Liu ◽  
...  
Keyword(s):  
Polyacrylic Acid ◽  
Slow Release ◽  
Salt Resistance ◽  
Deionized Water ◽  
Synthesis Process ◽  
Dihydrogen Phosphate ◽  
Water Absorbency ◽  
Ammonium Dihydrogen Phosphate ◽  
Potassium Humate ◽  
Salty Water

Polyacrylic acid (PAA) has high water absorbency but poor salt resistance. Humic acid (HA) extracted from lignite was introduced into the cross-linked copolymer systems of AA to improve the water absorbency and salt-tolerance. A polyacrylic acid-potassium humate (PAA-KHA) coated ammonium dihydrogen phosphate (ADP) fertilizer with water-preserving, salt-resistant and slow-release properties was prepared. The main properties of HA extracted from lignite oxidized by H2O2 were studied. Furthermore, the synthesis process, water absorbency of PAA-KHA in deionized water and in NaCl solution, morphologies of PAA-KHA, and the slow-release performance of the fertilizer (ADP@PAA-KHA) were investigated. The results showed PAA-KHA had a layered interpenetrating network, which can provide sufficient storage space for water and nutrients. The salty water absorbency of PAA-KHA increased by about 3 times compared to PAA. Both the PO43− and NH4+ cumulative release of ADP@PAA-KHA with a coating rate of 10% in deionized water, were less than 20% within 24 h, and were 55.71% and 28.04% after the 15th day, respectively. The weight change of ADP@PAA-KHA before and after absorbing water was about 53 times in deionized water and about 4 times in 1 wt% of NaCl salty water. The results show that ADP@PAA-KHA has excellent properties of water retention, salt resistance and slow-release. This will efficiently improve the utilization of fertilizer and reduce the irrigation water consumption at the same time.

scholarly journals Investigation and Characterization of Synthesis Conditions on Sucrose-ammonium Dihydrogen Phosphate (SADP) Adhesive: Bond Performance and Chemical Transformation

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4078 ◽  
Author(s):  
Shijing Sun ◽  
Min Zhang ◽  
Kenji Umemura ◽  
Zhongyuan Zhao
Keyword(s):  
Chemical Analysis ◽  
Chemical Transformation ◽  
Raw Material ◽  
Synthesis Process ◽  
Dihydrogen Phosphate ◽  
Ammonium Dihydrogen Phosphate ◽  
Synthesis Time ◽  
Synthesis Conditions ◽  
Renewable Chemicals ◽  
Bond Performance

Sucrose is one of the most abundantly available renewable chemicals in the world, and it is expected to be utilized as a raw material for wood-based material products. Herein, a novel adhesion system that was based on sucrose and ammonium dihydrogen phosphate (ADP) was synthesized into an adhesive with 80% solid content, and this eco-friendly was utilized on the fabrication of plywood. The effects of the synthesis conditions on the plywood bond performance and synthesis mechanism were investigated. The optimal synthesis conditions were as follows: the mass proportion between sucrose and ADP was 90/10, the synthesis temperature was 90 °C, and the synthesis time was 3 h. The bonding performance of the plywood that was bonded by optimal SADP adhesive satisfied the GB/T 9846-2015 standard. The chemical analysis was performance tested by using High-Performance Liquid Chromatography (HPLC), Attenuated Total Reflection-Fourier Transform Infrared Spectra (ATR-FTIR), and Pyrolysis Gas Chromatography and Mass Spectrometry (Py-GC/MS) to understand the chemical transformation during the synthesis process. The chemical analysis results confirmed that the hydrolysis and conversation reaction of sucrose occurred in the synthesized SADP adhesive, and ADP promoted the pyrolysis efficiency of sucrose.

Preparation and Properties of Anti-Salt Super Absorbent Resin

2013 ◽  
Vol 807-809 ◽  
pp. 2693-2698 ◽  
Author(s):  
Shan Quan Jiang ◽  
Xiang Wei Sun ◽  
Li Xin Ling ◽  
Jing Wang
Keyword(s):  
Crosslinking Agent ◽  
Ammonium Persulfate ◽  
Salt Resistance ◽  
Deionized Water ◽  
Water Absorbency ◽  
Solution Polymerization ◽  
Superabsorbent Polymer ◽  
Mass Ratio ◽  
Nacl Solution ◽  
Aqueous Solution Polymerization

The maleic acid ( MA ) 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and acrylamide (PAMPS/AM/MA) superabsorbent copolymer was synthesized by aqueous solution polymerization with ammonium persulfate as initiator,N,N-methylene-bisacrylamide ( NMBA) as crosslinking agent. The influence of neutralization degree of MA,mass ratio of AMPS to acrylamide ( AM) ,the amount of crosslinking agent and initiator,and reaction temperature on the absorption capability of water and salt solution were investigated. The results show that the water absorbency of the superabsorbent polymer prepared at the optimum condition in deionized water and in 0.9% NaCl solution is about 235 and 132g/g,respectively,and under the same conditions,the sample has more excellent water absorption and salt-resistance.

Water Absorption Technology of Gas Drilling

2014 ◽  
Vol 1006-1007 ◽  
pp. 112-114
Author(s):  
Bo Tang ◽  
Guang Tong Feng ◽  
Hao Xu
Keyword(s):  
Aqueous Solution ◽  
Polyacrylic Acid ◽  
Salt Resistance ◽  
Deionized Water ◽  
Acid Salt ◽  
Temperature Resistance ◽  
Absorbent Material ◽  
Gas Drilling ◽  
Compression Resistance ◽  
Water Absorbent Material

In recent years, the development of super-absorbent material was very fast, its ability to absorb water up to several hundred or even thousands times of its own weight, it provides a new way of gas drilling to solve the water carry problem. According to the characteristic of the formation, we optimized polyacrylic acid salt as the water absorbent material, and evaluate salt resistance, temperature resistance and compression resistance. And we discussed the feasibility and recycling of the technology. And we find that this kind of super-absorbent material which can absorb deionized water 1484 times,absorb 0.9% NaCl aqueous solution 687 times,absorb 50% ethanol 705 times, that can meet the water carrying requirements of gas drilling.

scholarly journals Preparation and properties of hydrogel based on sawdust cellulose for environmentally friendly slow release fertilizers

2020 ◽  
Vol 9 (1) ◽  
pp. 139-152 ◽  
Author(s):  
Xiao Zhang ◽  
Yanlu Liu ◽  
Panfang Lu ◽  
Min Zhang
Keyword(s):  
Slow Release ◽  
Environmentally Friendly ◽  
Water Absorbency ◽  
The Novel ◽  
Structure And Properties ◽  
Nitrogen Release ◽  
Release Property ◽  
Slow Release Fertilizers ◽  
Grafting Copolymerization ◽  
Cross Linker

AbstractA novel hydrogel slow-release nitrogen fertilizer based on sawdust with water absorbency was prepared using grafting copolymerization. Urea was incorporated as nitrogen source in a hydrogel fertilizer. Potassium persulfate (KPS) and N,N᾽-methylenebis acrylamide (MBA) were used as the initiator and cross-linker, respectively. The structure and properties of the samples were characterized by XPS, EDS, SEM, XRD and FTIR. The effects of various salt solutions, ionic strength and pH on swelling behavior were discussed. The results showed that the largest water absorbency of the sample reached 210 g/g in distilled water. In addition, the sample had the good nitrogen release property. Thus, the novel environmentally friendly hydrogel fertilizer may be widely applied to agricultural and horticultural fields.

The Effect of Phosphatic Composite on Magnesium Phosphate Cement Performance

2014 ◽  
Vol 809-810 ◽  
pp. 477-484
Author(s):  
Zhao Qing Qi ◽  
Hong Tao Wang ◽  
Jun Liang Dang ◽  
Shi Hao Zhang ◽  
Jian Hua Ding
Keyword(s):  
Setting Time ◽  
Potassium Dihydrogen Phosphate ◽  
Magnesium Phosphate ◽  
Dihydrogen Phosphate ◽  
Ammonium Dihydrogen Phosphate ◽  
Hydrogen Phosphate ◽  
Sodium Dihydrogen Phosphate ◽  
Disodium Hydrogen Phosphate ◽  
Potassium Dihydrogen ◽  
Sodium Dihydrogen

The capacity of 10%, 30%, and 50% ammonium dihydrogen phosphate were replaced with an equal amount of three phosphate (potassium dihydrogen phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate) respectively. Magnesium phosphate cement was made by phosphate of replaced, which strength, setting time, fluidity, hydration temperature, and the hydration products was researched. The results show that: MPC was made that replaced with the equal amount of three kind of phosphate, which has good mechanical properties. Setting time and fluidity change along with the replacment. Three kind of phosphate replace ammonium dihydrogen phosphate, which change the hydration process of MPC. When ammonium dihydrogen phosphate was replaced by an equal amount of disodium hydrogen phosphate, the temperature of hydration is only 69.4 °C. XRD showed that the diffraction peaks of composite’s magnesium phosphate cement increases.

Growth and Characterization of Ammonium Dihydrogen Phosphate (ADP) Doped with H3BO3 Crystals Grown by Slow Evaporation Method

2016 ◽  
Vol 675-676 ◽  
pp. 573-576 ◽  
Author(s):  
Pratya Thongpanit ◽  
Weerapong Chewpraditkul ◽  
Nakarin Pattanaboonmee
Keyword(s):  
Boric Acid ◽  
Temperature Stability ◽  
Hardness Measurement ◽  
Dihydrogen Phosphate ◽  
Ammonium Dihydrogen Phosphate ◽  
Slow Evaporation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Evaporation Method

Ammonium dihydrogen phosphate (ADP) crystals is very interesting due to its nonlinear optical property. This study investigated on improving of material for academic use by adding boric acid to modify ADP crystals. Slow evaporation method in aqueous solutions of pure ADP and ADP doped with three concentrations of H3BO3 as 0.1, 1.0, 5.0 %wt were studied. The grown crystals were confirmed tetragonal structure by powder X-ray diffraction studies. The FTIR spectrum analysis presented various functional groups of boron in three conditions of doped ADP. TGA study was comfirned the temperature stability at 220 °C for both pure and doped ADP crytals. The machanical stress was analyzed by Vicker’s hardness measurement. The results of this analysis showed boric acid doped 1.0 %wt had superior machanical stress from 10 to 75 grams. ADP doped with boric acid at 1.0 %wt was accepted in all test properties.

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