精氨酸改性壳聚糖及其衍生物对纤维板降醛除味效果研究

Effect of Arginine Modified Chitosan and Its Derivatives on Reduction of Formaldehyde and Odor Emission from Fiberboards

以精氨酸(arginine, Arg)接枝改性壳聚糖(chitosan, CTS)及壳聚糖季铵盐(Hydroxypropyltrimethyl ammonium chloride chitosan,HACC)制备两种净化剂(Arg-CTS,ArgHACC),研究其对纤维板甲醛、挥发性有机化合物和气味物质的去除效果。结果表明,ArgCTS、Arg-HACC可使纤维板甲醛释放量分别降低57.89%、75.00%,化学反应与物理屏蔽共同作用使Arg-HACC喷涂样的甲醛释放量更低。Arg-CTS和Arg-HACC对纤维板VOCs中的醛酮类、醇类、酸类物质有一定的清除效果,但对萜烯类、酯类和芳香族化合物的释放有促进作用。纤维板中气味活度值(odor activity value,OAV)大于1的物质主要有己醛(青草味)、庚醛(果子香味)、辛醛(青辛尖锐而有力的脂蜡香,带果香茉莉味)和壬醛(强烈的油脂气味和甜橙气息)。Arg-CTS和Arg-HACC净化剂均可大幅度降低这些气味物质的OAV值,其中,喷涂Arg-HACC净化剂的纤维板样品气味等级由3级降低到2级。

In this study,two new scavengers were prepared by using arginine(Arg)modified chitosan(CTS)or Hydroxypropyltrimethyl ammonium chloride chitosan(HACC).The effects of the new scavengers on the reduction of formaldehyde emission,VOCs,and odor from fiberboards were investigated.The results showed that after applying Arg-CTS and Arg-HACC,the formaldehyde emission from fiberboards were reduced by 57.89%and 75.00%respectively,The formaldehyde emission from Arg-HACC spray samples was lower under the combined action of chemical reactions and physical shielding.Although aldehydes,ketones,alcohols,and acid compounds from fiberboards were partially scavenged,the release of terpenes,esters,and aromatic compounds was enhanced by Arg-CTS,Arg-HACC.The odor substances with the odor activity value(OAV)greater than 1 in fiberboards mainly include hexanal(green grass flavor),heptanal(fruit flavor),octanal(sharp and powerful fat wax aroma with fruit and jasmine flavor),and nonanal(strong oil and sweet orange flavor).The OAV of these odor substances were significantly reduced by Arg-CTS or Arg-HACC.Furthermore,the deodorizing effect of Arg-HACC was better than that of Arg-CTS.Ultimately,the odor level of fiberboard samples sprayed withArg-HACC purification agent decreased from level 3 to level 2.