Abstract:

In this paper, ZJS1、ZJS2 and ZJS3 cross linking modified starch were prepared by different operational path. Their material was corn starch and they can meet target of operational requirement in API wood adhesive and their physical and chemical properties were analyzed by comparison. Results show that properties of modified starch prepared in different operational path are different. ZJS1 modified starch degree of cross linking is the highest and degree of ester substitute is smaller. It is apt to disperse in PVA water solution and film forming property is good and hot stability of paste starch is common. But its degree of transparency is poor and is retrogradation easily and its stability as main agent of API is poor. ZJS3 modified starch degree of cross linking is the lowest and its degree of ester substitute is the highest. It is hard to disperse in PVA solution and hot stability of its paste viscosity is poor.But its degree of transparency is good and is retrogradation difficulty as primary ingredient in main agent of API. Bonding strength of poplar plywood pressed by ZJS 3 is disqualification. ZJS 2 modified starch degree of ester substitute is the smallest. Dispersedness and filmforming and stability are excellent. It is not prone to retrogradation and hot stability is the best. Its technology is good and bonding strength is high when it is used as main agent of API adhesive. So it is perfect modified starch used in main agent of API.

Key words: ester, cross linking, corn starch, main agent of API adhesive