The Technology Of Silk Textile Antiseptic And Mildew Is Refined And The Process Control Is Done In Dyeing.

In view of the silk refining and dyeing workshop's high temperature and high humidity, and some additives such as plasticizers, oil and pigments, which are applied to silk on the silk during the dyeing and finishing process, some oil additives, such as plasticizers, oil and pigments, will be moldy.

Acetylation and cyanylation of silk fibers can not make them feed for mold.

The method of cyanidation of silk is to immerse sodium hydroxide or sodium cyanide in 0.1% to 1% aqueous solution or react with acrylonitrile in gas phase.

This technology is through chemical reaction, on the silk fiber connected with antibacterial groups, so that silk fiber has permanent antibacterial effect.

But this method has a high demand for antibacterial groups, and mR technology is also more complex, so the current application is not very extensive.

Chitosan was prepared into a certain concentration of acetic acid solution, that is, an antibacterial finishing agent. Two impregnated two rolling method (rolling rate 100) was applied to finish the silk nonwovens.

After finishing, the silk nonwoven fabric has obvious antibacterial activity against Staphylococcus aureus and Escherichia coli. The antibacterial activity against Candida albicans is low, washing resistance is good, no cross linking agent is added, thus avoiding the influence of the cross linking agent on the feel of the nonwoven fabric.

The antibacterial mechanism of chitosan is mainly that the quaternary ammonium cation of chitosan molecules can adsorb bacteria. It can combine with the anions on the surface of bacterial cell walls, impede the growth and synthesis of bacteria and make them denatured. Meanwhile, the grape glycoside bond breakage in the molecular chain of chitosan prevents the pmission of substances inside and outside the cell wall, thereby damaging the function of metabolism, respiration and material pportation of bacteria, and causing them to lose their living conditions, resulting in the exposure of bacterial internal tissues and death.

It is reported that the antibacterial conductive silk fibers can be prepared by the reaction of copper compounds and sulfur reducing agents. The preparation process is as follows: silk fiber, a copper compound, a sulfur reducing agent, and a crystalline antibacterial conductive fiber.

The X - ray diffraction scanning electron microscopy (SEM) shows that the surface of the silk fiber is covered with a continuous and uniform distribution of CuS antibacterial conductive layer.

The results showed that the treated silk fiber had a bacteriostasis rate of 98% against Escherichia coli, Staphylococcus aureus and Candida albicans. Moreover, after 2O washing, the fabric still had a high antibacterial rate. This was because the silk fibers were firmly bound with a certain amount of copper compounds. The concentration of copper ions on the fibers was 3.13 * 10-4mol/g by the atomic spectrophotometer, and the specific resistance PV decreased from 9.2 * 109 ohm cm to 57.6 cm.

Therefore, the silk fibers prepared by this method not only have excellent antibacterial properties, but also have good electrical conductivity.

The silk fibroin treated with tannic acid was prepared in the solution of silver (I) aqueous solution and zinc (II), copper (II) and nickel (II) ammonia complex. The metal complex silk fibroin fiber was prepared and had strong bactericidal effect against Staphylococcus aureus and Klebsiella.

The preparation methods are as follows:

Preparation of silk fibroin fiber: removing pupa from fresh cocoon of silkworm, drying cocoon layer in the dryer, refining with 0.5% (mass concentration, the same below) mercerized soap solution.

The concentration of Na2CO3 is 0.05%.

The solution was impregnated with 10min. After being removed, it was cleaned with distilled water. After drying, the pure silk fibroin was obtained by extracting wax from 48h in ether.

Silk fibroin fiber tannic acid treatment: silk fibroin and 4.76 tannin solution in bath ratio of 100:1, at the solution temperature of 7O degrees, 2h impregnation.

Silk fibroin fibers were removed for drying.

The adsorption rate of silk fibroin fiber to tannic acid was 25.14%.

The silk fibroin fiber was mixed with Cu (NO3) 2. H2O, AgNO3, Ni (NO3) 2. 6H2O, Zn (NO3) 2. 6H2O to prepare various aqueous solutions of 0.02M and metal complexes of NO3.

The corresponding KNO3 was added according to the ionic concentration of the solution, and the amount added was KNO3 corresponding to 0.1M plus 2M.

Tannin treated silk fibroin

The bath is soaked in the above solution at a temperature of 25 100:1.

After shaking 24h, wash it with distilled water and methanol and vacuum drying.

The planar type of silk fibroin complex has no antibacterial property; the complex immobilized fiber obtained from tannin treated silk fibroin in low pH value of silver (I) aqueous solution has strong bactericidal activity against Staphylococcus aureus and Klebsiella, although the amount of metal ions is low, and the metal complex fiber prepared from tannin treated silk fibroin fiber in aqueous solution of copper (II), zinc (II) and nickel (1I) ammonia complex has strong bactericidal activity against Staphylococcus aureus and Klebsiella due to the formation of planar metal tannic acid complex and silk fibroin fiber. The experimental results showed that the untreated silk fibroin fibers reacted in aqueous solutions of copper (II), zinc (II) and nickel (II) ammonia complexes.

Data showed that the silk fabric treated with tannic acid had a high absorption capacity for Ag, and an abnormal stable silk to tannic acid Ag complex showed excellent antibacterial activity.

The dye molecules are impregnated in dye solution. The dye molecules are adsorbed on the fiber by hydrogen bonding, dipole force, dispersion force and other intermolecular forces. Then the dye is fixed in the solution containing copper (II) ions. The dye is immobilization due to the coordination of copper (II) ions. After washing and drying, the functional silk fiber and fabric are prepared. It has excellent antibacterial properties. This is the result of the synergistic effect of dye molecules. After washing for 50 times, it still maintains good antibacterial properties and can meet the practical requirements.