High-performance natural silk fiber and preparation method thereof

A natural silk and high-performance technology, applied in fiber processing, animal fiber, textiles and papermaking, etc., can solve the problems of limited performance improvement, poor mechanical properties, and inability to achieve the effect of improving fracture strength and improving mechanical properties

Active Publication Date: 2016-01-20
NANTONG TEXTILE & SILK IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thanks to its unique multi-level structure, natural silk fiber already has very excellent mechanical properties. The performance improvement on this basis will be the best way to prepare high-performance silk protein fibers. If the natural silk structure can be improved Recombination, and then transforming silk by stretching and setting process, theoretically, the result of strong spinning should also be obtained; however, the formed natural silk fiber is mainly antiparallel β-fold crystal structure, and its aggregated structure is very stable. Difficult to change, so physical stretching post-processing is not possible with existing technolo

Method used

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  • High-performance natural silk fiber and preparation method thereof
  • High-performance natural silk fiber and preparation method thereof
  • High-performance natural silk fiber and preparation method thereof

Examples

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[0028] Example one

[0029] (1) Preparation of natural silk swelling liquid: dilute 98wt% formic acid with water to 80%, and then add lithium bromide to prepare an 80% formic acid solution containing 2% lithium bromide, which is the silk swelling liquid;

[0030] (2) Immerse the silkworm cocoon silk in the swelling solution of step (1) for 30 seconds, and control the shrinkage of the cocoon silk to 60% of the original length to obtain the shrinkage cocoon silk;

[0031] (3) The shrinkage cocoon yarn obtained in step (2) is washed with deionized water, then neutralized with excess acid in 1wt% sodium hydroxide aqueous solution, washed again, and dried in an oven at 60℃ to obtain high-performance natural silk fiber .

[0032] Table 1 shows the mechanical tensile data of the silkworm cocoon silk before and after treatment. The cocoon silk processed according to the technical scheme provided by the present invention has excellent ductility, and the elongation at break reaches more than 50...

Example Embodiment

[0036] Example two

[0037] (1) Preparation of silk swelling liquid: dilute 98% formic acid with water to 80%, and then add calcium chloride to prepare an 80% formic acid solution containing 2% calcium chloride, which is the silk swelling liquid;

[0038] (2) Immerse the silkworm cocoon silk in the swelling solution of step (1) for 30 seconds, and then stretch the cocoon silk to twice its original length to obtain the stretched cocoon silk;

[0039] (3) The stretched cocoon silk obtained in step (2) is washed with deionized water, then neutralized with excess acid in 1wt% sodium hydroxide aqueous solution, washed again and dried in an oven at 60℃ to obtain high-performance natural silk fiber .

[0040] Table 2 shows the mechanical tensile data of the cocoon silk before and after the treatment. The cocoon silk processed according to the technical scheme provided by the present invention has excellent strength, and the breaking strength reaches 900 MPa or more.

[0041] Table 2 Mechanica...

Example Embodiment

[0044] Example three

[0045] (1) Prepare silk swelling liquid: add lithium thiocyanate to 98% formic acid to prepare a formic acid solution containing 1% lithium thiocyanate, which is the silk swelling liquid;

[0046] (2) Immerse the 20-22D raw silk in the swelling solution of step (1) for 50s, and then control the shrinkage of the cocoon silk to 30% of the original length to obtain the shrinkage raw silk;

[0047] (3) The shrunken raw silk obtained in step (2) is washed with deionized water, then the excess acid is neutralized in 1 wt% sodium hydroxide aqueous solution, washed again, and dried in an oven at 70° C. to obtain high-performance natural silk fibers.

[0048] Table 3 shows the mechanical tensile data of the raw silk before and after treatment. The raw silk treated according to the technical scheme provided by the present invention has excellent ductility, the elongation at break reaches more than 50%, and the work at break is increased by about 20%.

[0049] Table 3 Mechan...

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Abstract

The invention discloses a high-performance natural silk fiber and a preparation method thereof. High-performance silk fiber is formed by taking cocoon silk, raw silk, twisted silk or silk weaving yarn as raw materials and then performing contracting or stretching. The method specifically comprises the steps that inorganic salt, acid and water are mixed according to a certain ratio to prepare a silk swelling solution; the silk fiber is immersed into the swelling solution, and then stretching or contracting is performed; lastly, rinsing with clear water, neutralizing treating and drying are performed to obtain the high-performance natural silk fiber. The preparation method is simple, effective and short in process, the breaking strength of the silk fiber prepared through the method is comparable with that of spider silk, and therefore the high-performance natural silk fiber is suitable for application of the advanced technical fields of artificial ligaments, ophthalmological sutures, protective garments and the like.

Description

technical field [0001] The invention belongs to the field of natural polymer materials, and in particular relates to a high-performance natural silk fiber and a preparation method thereof. Background technique [0002] Silk is a continuous long fiber formed by the cocooning of silk glands secreted by silk glands when cooked silkworms make cocoons. It is one of the earliest animal fibers used by humans. According to different foods, silk is divided into mulberry silk, tussah silk, celestial silk and castor silk. The thread drawn from a single silkworm cocoon is called cocoon silk, which is made of two single fibers bonded and covered by sericin. The cocoon filaments of several silkworm cocoons are drawn out, and the silk strips formed by bonding and wrapping with sericin are called raw silk. Several raw silks are processed into twisted yarns or braided sutures after processes such as winding, merging, twisting or weaving. As a high-grade textile raw material, silk products...

Claims

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Application Information

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IPC IPC(8): D06M13/188D06M11/13D06M11/155D06M11/52D06M11/56D06M11/70D06M101/10
Inventor 张锋左保齐
Owner NANTONG TEXTILE & SILK IND TECH RES INST
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