Collagen has great potential applications because of its unique construction of three-ply helix,predominant bio-compatibility and bio-degradability.For further development of the application domain of cellulose and exploiting new green cellulosic fibers,a new cotton fiber coated with collagen was prepared by the limited selective oxidation of the fiber with sodium periodate and subsequent treatment with the solution of collagen in this paper.The results showed that the breaking strength of the cotton fiber after the limited oxidation by sodium periodate did not decrease remarkably,and the collagen molecules through the CN double bond of the Schiff base combined on the surface of the cotton fiber.
For the poor wrinkle-resistant and poor antibacterial properties performance,silk fabrics were treated with low-temperature oxygen plasma before coordinated by chitosan-citric acid solution through dou-ble-dip-double-nip.The factors influenced on finishing results were studied and the anti-crease finishing process was obtained.The wrinkle-resistant properties of the finished fabrics were improved greatly and crease recovery angle could be improved more than 50o,while the breaking strength and the whiteness declined slightly.The re-sults showed that the chemical crosslinking reaction occurred between chitosan and silk fiber when silk fabrics were carried out plasma-chitosan compound finishing,so the crease recovery performance was improved,and the crystallinity of the finished silk fabrics slightly decreased.
Crease resistance and UV resistance finishing of cotton fabric is carried out with aloe and compound acid of citric acid and tartaric acid in one bath.The influences of concentration and ratio of the compound acid,as well as concentration of aloe on the crease recovery angle,UV resistance,tensile strength and weight increase rate of the fabric are investigated.The action mechanism of aloe and compound acid on cotton fabric is discussed by IR and X-ray technologies.Anti ultraviolet and crease resistance of cotton fabric have been improved significantly.
In this experiment,the blend films were mainly prepared from silk fibroin,and the sodium alginate and glycerol were also added in as additive.Concentration of silk fibroin solution,concentration of sodium alginate solution and glycerin amount were studied which have some effects on the properties of the blend films,including thickness,elongation at break and vapor transfer velocity.The optimal formula for the silk fibroin-sodium alginate-glycerol blend films was determined by orthogonal experiment.The results showed that the best concentration of silk fibroin,concentration of sodium alginate and glycerol amount were 3%,12.5 mg/ml and 0.5 ml,respectively.In this condition,the thickness,elongation at break and vapor transfer velocity of the blend films could reach 0.075 mm,45.53% and 13.76 g.m-2.h-1,respectively.
We discussed the wrinkle recovery angle,whiteness,breaking strength of cotton fabric after hav-ing been finished by fibroin,citric acid,fibroin/ citric acid.We finished the cotton fabric with fibroin/citric acid complex,and found that the silk/cotton,citric acid compound treatment showed good synergistic coordination,which not only overcame the shortcoming of turning-yellow with citric acid treatment,but also improved the anti-wrinkle properties of cotton fabric.Four factors such as fibroin concentration,fibroin hydrolysis time,citric acid dosage,pH value,were chosen to design L16(44)orthogonal experiment.The results suggest that treated with fibroin 6%,citric acid 30 g·L-1,fibroin hydrolysis for 2 h,pH 6,cotton fabric could get best finishing effect.
Introduce the full face-mechanized hydraulic outburst-prevention driller in Pingdingshan Coal Co., Ltd. independently developed by her. The machine can be used in the conditions, such as digging difficultly, digging slowly and digging light holes. The practice of 1 year shows that the machine has characteristics of simple structure, safety and reliability, convenient maintenance and high efficiency, and it is important value for use and promotion.
For exploiting the advanced functional fiber and new cellulose-based materials,a new cotton fiber modified with collagen protein was prepared through limited selective oxidation of cotton thread by sodium periodate,followed by reacting with the solution of collagen protein.Through analyzing the micro-morphology and the aggregation structure of cotton fiber treated with collagen protein,the changes in the micro-structure of cotton fiber coated with collagen were studied.The analysis suggested that the imine structure bonds were formed between collagen molecule and oxidized cotton fiber,and the treated fiber exhibited little change in crystallinity and marked enhancement in thermal stability.
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