| In order to accelerate China's pace of mechanization of rice cultivation, and avoid a series of cumbersome labor such as breeding and transplanting, A kind of Bio-material used for paddy seeding sheet was prepared.It can satisfy the condition of mechanization of rice cultivation,and the seeds can germinate in a prescribed width.It will be degraded completely as fertilizer at last.Besides,it also can suppress the growth of weeds.The straw was used as raw materials to make the paddy seeding sheet ,and the waxiness on the surface of straw which is going agaist the sheet making can be removed by the method of chemical and biological pretreatment.And the straw hydrolysis process was optimized by Orthogonal design experiment ,the results shew that when temperature was 121℃,alkalinity was 1.2% and the hydrolyzed time was 20min,the tensile index was 11.64 N.m.g-1.The method of synthesize of bio-based adhesive used for making the paddy seeding sheet was studied . It can satisfy the design with starting material corn starch which was first modified by cooking with alkaline Pulps,then oxidation and cross-linking. And the method of synthesize was optimized by Orthogonal design experiment ,the results shew that when oxidized at 60℃about 1.5h by adding 0.6ml oxidizer and 5g cross-linkier,its Viscosity and Cohesive force is the best. And the structure of adhesive was characterized with IR.Its applying feasibility is evaluated by the tests in the lab.The result shew that, 1. there is no negative impact on the germination of seeds by using the sheet 2. The seeding sheet will be degraded completely as fertilizer in the 70 days .3. Its cost is about 0.09$/m2and can be accepted by the Farmers in our Country . |
