Orthogonal experimental results of preparation of low molecular polyamide.

Factors	Reaction time/h	Reaction temperature/°C	Ratio of raw materials
Mean amine values 1	566.33	615.67	505.00
Mean amine values 2	670.33	608.33	632.00
Mean amine values 3	621.67	634.33	721.33
Range of amine values	104.00	26.00	216.33
Average viscosity 1	23.936	27.831	61.872
Average viscosity 2	23.749	27.851	10.772
Average viscosity 3	29.050	21.053	4.092
Range of viscosities	5.301	6.797	57.780