Heat Resistance Property

The shrinkage rates of soybean fiber in boiling water and dry heat air are listed in Table.14.

Table.14 The shrinkage rate of soybean fiber in boiling water and dry heat air

The test result indicates that the heat shrinkage rate of soybean fiber is rather great, and soybean fiber has no obvious melting point. The fiber strength decreases largely, and the color becomes pale yellow at 160° C; and at 200° C, the color becomes deep yellow; at 300° C, the fiber begins to carbonize, and the color becomes brown. Therefore the temperatures of dyeing and setting of soybean fabric are preferred not to exceed 100° C. If the setting temperature is 110° C, the fabric handle becomes hard. At this time, the fabric handle can only be improved by the washing of soap bath above 60° C.