Preparation method of high-performance flat cocoon composite material

Abstract

The invention discloses a preparation method of a high-performance flat cocoon composite material. The preparation method comprises the following steps: 1, enabling silkworms to spin in a two-dimensional plane by adjusting a silkworm cocooning environment; 2, preparing flat cocoons with different areas and different thicknesses by changing the number of matured silkworms and spinning time; 3, optimizing a cocoon shell structure through a hot pressing method; and 4, alternately laying a hot-pressed flat cocoon layer and a resin film, and preparing the high-performance flat cocoon composite material through a hot-pressing process. The flat cocoon layer is prepared by using the spinning instinct of the silkworms, and the flat cocoon layer with a natural cocoon layer structure is used as a reinforcement of the composite material, so the composite material with excellent mechanical properties can be obtained. The size and the thickness of the flat cocoon can be adjusted by changing the number of the matured silkworms and the spinning time, and the flat cocoon is compact in structure, can be freely cut and is convenient to manufacture after being hot-pressed, and the defects of small size, irregular shape and the like of a common cocoon are fully overcome.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, in particular to a preparation method of high-performance flat cocoon composite material. Background technique [0002] After a long-term natural selection process, the silkworm has evolved the special ability of spinning silk and cocooning to protect the silkworm chrysalis from predators, radiation, moisture and pathogens. As an important protective device, silkworm cocoon is a natural multi-layer structure composite material with porous mesostructure (its main components are silk fibroin and sericin), which has the advantages of porous, comfortable, breathable, tough, environmentally friendly and renewable, and excellent Impact resistance. However, the small size, irregular shape, uneven quality and irregular cocoon layer of silkworm cocoons seriously limit the in-depth research and development and large-scale application of silkworm cocoons as protective structural mate...

AI Technical Summary

Problems solved by technology

[0004] However, the traditional silk reeling process completely destroys the biological structure of silkworm cocoons. In terms of directly using silkworm cocoons to prepare composite products with special protective properties: the document titled in the Chinese invention patent CN201710243121.2 published in 2017 is high-strength silkworm cocoon structure composite material In the preparation method of Wang Tao et al., cut silkworm cocoons into squares, and then spliced ​​them into complete large-area silkworm cocoon sheets, then laid the above-mentioned silkworm cocoon sheets with odd layers, and finally applied adhesive to the above-mentioned laminated materials, and then subjected to hot-press molding A silkworm cocoon structural composite material with excellent mechanical properties was prepared; in his dissertation "Design and Characterization of High Performance Fiber / Natural Nonwoven Composite Products" published in 2015, Xiao Xinxiang cut the natural tussah cocoon into strips, and then combined it with aramid fiber Combining the two through the special "two-system warp" weaving method, the cocoon / aramid composite product prepared has a good ability to resist low-speed impact, but the ability to resist high-speed ballistic impact is still limited

Due to the limited size of traditional silkworm cocoons, in the existing research of directly using silkworm cocoons to prepare composite materials, silkworm cocoons have to be cut into strips, sheets or granular cocoons. These methods cannot make full use of the porous and continuous biological structure of natural silkworm cocoons and Excellent impact resistance, and the existing technology is to cut and splice natural cocoons into flat cocoons. Serious impact