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《Journal of Hunan University of Arts and Science(Natural Science Edition)》 2006-04
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Study on Using Nanometer SiO_2 and CaCO_3 for the Free Formaldehyde Content of the UF Resin

XIAO An-guo,ZHANG Ru-xiang,HAO Ai-ping,YANG Yu(Department of Chemistry and Chemical Engineering,Hunan University of Arts and Science,CHangde Hunan 415000)  
Used nanometer SiO2 and nanometer CaCO3 which incorporated with 1 wt% KH-570 silane coupling agent to fill UF resin by discontinuous ultrasonic vibration to modify UF resin;Analyzed and discussed the effects of nanometer SiO2 and CaCO3 content on properties of the UF resin,such as free formaldehyde content,viscosity and stretch shearing strength.The results showed that nanometer SiO2 and nanometer CaCO3 content used in the same mole ratio of the F/U have the varying degree influence compared to the UF resin performance.When the content of nano-SiO2 was below 1.5 wt%,the content of free formaldehyde decreased,viscosity and stretch shearing strength of the resin increased with the nano-SiO2 added,which had little contribution to the curing time.However,the content of free formaldehyde was not decreased when the content of nano-SiO2 was over 1.5 wt%;Free formaldehyde was decreased,while viscosity was increased as the nanometer calcium carbonate was added.Although calcium carbonate had little influence on stretch shearing strength,it delayed the curing time of resin.When the content of calcium carbonate is more than 7 wt%,the resin cannot solidify.Therefore,when the content of calcium carbonate supposed to be controlled about 5wt%,the properties of the resin was best.
【CateGory Index】: TQ433.431
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