| This paper firstly studied the formaldehyde release situation of straw pot. Then selected six typical crop seeds as research objects, and determined the physiological and biochemical index during germination and seedlings under different formaldehyde concentrations, meanwhile, the activity of related stress resistance enzymes in seedling were also researched. The results showed that:different seeds have different sensitivity,tolerated responses to same formaldehyde concentration, one seed has different responses to different formaldehyde concentrations. When formaldehyde concentration reached to the tolerance threshold of seeds, it would greatly restrain the germination of seeds.This paper also researched polyols liquefaction of straw. Using liquefaction rate as an index, the effect of liquefied reaction time, temperature and the amount of catalyst on liquefaction was investigated on the basis of two times scale of liquefier to straw stalk mass. Through orthogonal test and FTIR analysis, the optimal conditions of liquefaction were studied. The results showed that:while liquefaction scale,temperature,reaction time and catalyst amount were 2,165℃,75 min and 5%, respectively, liquefaction rates can reach to 88.25%, and hydroxyl contents was 216 mg·g-1. Results of infrared spectral analysis indicated that liquefaction products contain hydroxyl active components.Try to apply straw stalk liquefaction products as modified filler to urea-formaldehyde adhesive. In the condition of F/U was 1.2 and 1.3, urea-formaldehyde bonding strength improved 16.9% and 18.1%, respectively, the formaldehyde release of straw pots also decreased 11.4% and 12.1%, respectively, compared the situation of didn't add liquefaction products. These suggested that liquefaction products have positive effect on reducing straw pot formaldehyde release. It may provide a new method for FU adhesive cure, but it still need further research because of cost and process increased. |
