A kind of dialdehyde starch cross-linked fiber/cotton seed protein composite material and its preparation method and application
A technology of cottonseed protein and dialdehyde starch, which can be used in transportation and packaging, sustainable manufacturing/processing, bio-packaging, etc. It can solve the problems of few reports and low mechanical strength, and achieve good thermal stability and high cross-linking ability , Improve the effect of tensile strength and thermal stability
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[0039] A preparation method of dialdehyde starch cross-linked fiber / cotton seed protein composite material, comprising the following steps:
[0040] a) Denaturing the cottonseed protein to obtain denatured cottonseed protein, and then performing a cross-linking reaction between the denatured cottonseed protein and dialdehyde starch to obtain cross-linked cottonseed protein;
[0041] b) plasticizing the cross-linked cottonseed protein, and then placing the radially distributed alkalized fibers in a mold for hot-press molding to obtain a dialdehyde starch cross-linked fiber / cotton seed protein composite material.
[0042] Dialdehyde starch (DAS) is an oxidized modified starch containing active aldehyde groups. It is considered to be a kind of modified starch with great potential and development prospects. , can become an important chemical raw material. The aldehyde functional group in dialdehyde starch has alkali solubility, easy cross-linking, strong cohesive force, not easy ...
Embodiment 1
[0072] This embodiment carries out the preparation of dialdehyde starch cross-linked fiber / cotton seed protein composite material, comprising the following steps:
[0073] 1) Weigh 50 parts by weight of cottonseed protein powder in a large beaker, add 300mL of 1M urea solution, the mass ratio of cottonseed protein powder to urea solution is 1:6, stir at room temperature for 4h for denaturation treatment, and obtain denatured Cottonseed protein solution, the pH value of the denatured cottonseed protein solution is adjusted to 12 with 1M NaOH solution;
[0074] 2) Put the denatured cottonseed protein solution in a constant temperature water bath at 70°C and mechanically stir for 20 minutes, then add 10 parts by weight of dialdehyde starch, and continue to mechanically stir for 30 minutes to carry out cross-linking reaction to obtain a cross-linked cottonseed protein solution;
[0075] 3) 0.15 g of alkalized sisal fibers with a length of 10 cm and an average diameter of 0.5 mm ar...
Embodiment 2
[0080] This embodiment carries out the preparation of dialdehyde starch cross-linked fiber / cottonseed protein composite material, method and steps are the same as embodiment 1, but step 1) the mass ratio of cottonseed protein powder and urea solution is 1:8, step 2) dialdehyde starch 20 parts by weight, step 4) the weight part of glycerin is 30 parts, step 5) the temperature of hot press molding is 130 ℃, the pressure is 20Mpa, and the time is 4min.
[0081] see image 3 and Figure 4 , is the cross-sectional SEM figure of the dialdehyde starch cross-linked fiber / cotton seed protein composite material of Example 2 of the present invention, image 3 and Figure 4 It shows that the fiber has a good bond with the cottonseed protein matrix, but there are gaps, which may be caused by the uneven distribution of the fibers, but the overall bonding of the dialdehyde starch crosslinked fiber / cotton seed protein composite is better, and also It is relatively tight, indicating that th...
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