| Chitosan, polyvinyl alcohol, acrylic acid as raw material, used KPS initiator,crosslinking agent with NMBA, through graft copolymerization intochitosan-polyvinylalcohol-polyacrylic acid superabsorbent composite resin, andinfrared spectroscopy characterization of their structure, and at the same time, acrylicacid as the reference, the system studied on the quality of chitosan, polyvinyl alcoholand acrylic acid ratio, initiator and crosslinking agent, the percentage of neutralizationof acrylic acid, reaction temperature, reaction time and prepriming time on waterabsorption properties of composite superabsorbent resin. The results showed that,when the chitosan, polyvinyl alcohol and acrylic acid ratio were0.06and0.3, initiatorand crosslinker, respectively1.5%and0.23%, the percentage of neutralizing acrylicacid is55%, reaction time was5h, the reaction temperature is45℃, prepriming timeis18min, the highest water absorptions were344times and64times.Polymerization of polyvinyl alcohol chitosan polyacrylic acid compositesuperabsorbent resin by solution and investigated its in various concentrations of saltsolution, artificial urine and different pH solution absorbency in various temperatureconditions, water retention, repeated water absorption capacity and absorption rate indistilled water.The results showed that, with the increase of composite resin valenceand concentration of salt solution, absorbing ability, in the urine absorbing capacitythan the chitosan polyacrylic acid resin and acrylic resin had better absorptioncapacity, good at pH=7~10; drying of250min at70℃environment, resin water lossrate of only32%, repeat water7times still could keep water60%.The growth of aspergillus niger and beauveria bassiana was studied by themethod of strain medium while using the carbon source ofChitosan-polyvinylalcohol-Acrylic acid Superabsorbent Polymers, and thesuperabsorbent polymersvector which will be uesd as biopesticide beauveria bassianain the future was under a tentative exploration. The scanning electron microscopeanalysis showed that Chitosan-polyvinylalcohol-Acrylic acid SuperabsorbentPolymers possesses certain biodegradability. A soil pot experiment was conducted to study the effect of CTS-PVA、CTS-PVA-PAA、P（AA-AM) aquasorb of different mass percents on soil electricconductivity, organic content, the content of chlorophyll, N, P, K, Fe, Ca of peanutseedling and plant biomass. The results showed that when P（AA-AM) was added tosoil, the organic content, together with factors such as content of chlorophyll,N,P,K,Fe,Ca and biomass would significantly reduce with the increase of P (AA-AM), and it had significant negative correlation, while the soil conductivity wouldincrease in the same time.When CTS-PVA or CTS-PVA-PAA was added to soil, it hadopposite result. The content of chlorophyll, N, P, K, Fe, Ca together with factors suchas biomass would significantly increase with the increase of CTS-PVA orCTS-PVA-PAA, and it had significant positive correlation. But when theconcentration was more than2%, all the factors began to decline, and during the time,soil organic content would increase while conductivity would decrease with theincreasing concentration of CTS-PVA or CTS-PVA-PAA.In order to obtain biological pesticides effectively killed the grubs pests, usingsoil mixing method on chitosan/PVA-polyacrylate water retaining agent packageinsecticidal effect of Beauveria bassiana submerged biological material forpreliminary testing. The results showed that: Beauveria bassiana spores solutiondirectly to grub pest mortality was93%, and when each Kebao agent containing theamount of spores was6%, the best, the killing effect of LC50was0.018g/g, with thedecrease in the amount of spore bearing, its death rate gradually decreased. |
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