Effect of sericin treatment on the performance of cotton fabric

[Abstract] In this paper, silk fibroin cotton was prepared by selective oxidation of cotton fabric and re-use of sericin solution to oxidized cotton fabric, and its anti-wrinkle and water absorption on cotton fabric were discussed. The impact of performance.

As a kind of natural cellulose fiber, cotton fiber plays an important role in the field of textile materials. Its products have many excellent properties, but there are defects such as poor wrinkle resistance and shrinkage deformation during wearing. These problems are in high-performance fibers. Today, the variety is emerging more and more prominent.

Sericin is a macromolecular natural protein with a molecular mass of more than 300,000, accounting for 20% to 30% of the total silk protein. The sermeric peptide with low molecular weight and its hydrolyzate have excellent functions of moisture absorption, moisture release, anti-oxidation, anti-tumor, anti-aging, promotion of gastrointestinal digestion and skin care and beauty, and are available in cosmetics, health care products, nutritious foods, etc. Wide application prospects. The larger molecular weight sericin is cross-linked, modified or cross-linked with other polymer materials, copolymerized, etc. to synthesize new polymer materials in medical materials, biodegradable materials, synthetic polymer materials, functional biofilms, Surfactants, functional fiber finishing agents, etc. have a wide range of applications.

In this paper, sodium iodate is used to selectively oxidize cotton fabrics to oxidize hydroxyl groups on cotton fibers to aldehyde groups, to form oxidized cotton fibers, and then to process cotton fabrics with sericin solution, which is beneficial to cotton fibers and sericin. A new covalent bond was formed and the sericin was applied to the cotton fabric. The paper analyzed the wrinkle resistance and water absorption of the cotton fabric before and after the sericin coating.

1 experimental part

1.1 Materials and drugs

Cotton fabric after scouring and bleaching; sericin powder (molecular weight 15000, supplied by Huzhou Nanfang Biotechnology Co., Ltd.); sodium periodate and propanol, all of which are chemically pure.

1.2 Preparation of samples

Cut dozens of cotton fabrics of a certain size, place them in a certain concentration of sodium periodate solution, and oxidize at 50 ° C for 2 h in the dark. Then, it was placed in a 0.1 mol/L glycerol solution for 0.5 h to remove unreacted sodium periodate. After thoroughly washing with deionized water, it was naturally dried to obtain an oxidized cotton fabric. The prepared oxidized cotton fabric was respectively put into a certain mass percentage of sericin solution at a bath ratio of 1:30, and immersed at a certain temperature for a period of time, then subjected to 80 pre-bake and 130 ° C baking in an oven, and then washed and soaked for 24 hours. , put it in the air and let it dry naturally.

1.3 test method

1.3.1 Anti-wrinkle performance test

Instrument: YG541A wrinkle recovery tester; test method: the wrinkle resistance of the fabric can be expressed by the wrinkle recovery angle. This experiment adopts the method of measuring the wrinkle recovery angle according to the horizontal method in GB/T3819-1997, "Measurement of recovery angle of textile fabric crease recovery".

1.3.2 Water absorption test

Capillary effect test: Refer to the standard ZBW04019-90 textile capillary effect test method;

Test conditions: the sample size is 200mmX50ram, three in the warp and weft direction; the water temperature in the capillary effect container should be (27-4-2), and the 3g tension clamp is installed at the lower end of the sample at 8ram~10ram, and the tension is clamped on the plane and the ruler. Zero line alignment, set the test time to 30min. Record the rise level of the liquid surface.

2 experimental results and analysis

2.1 Effect of sericin on the wrinkle resistance of cotton fabrics

2.1.1 Wrinkle recovery of cotton fabric treated with sericin at different degrees of oxidation

Table 1 is a table showing the anti-wrinkle performance parameters of cotton fabrics with different degrees of oxidation after being treated with a 3% by mass sericin solution. It can be seen from the table that the sharp and slow elastic recovery angle of the oxidized cotton fabric is significantly larger than that of the unoxidized cotton fabric, and increases with the increase of the oxidation degree, indicating that the wrinkle recovery property of the cotton fabric after oxidation by sodium periodate is obtained. improve. This is because the macromolecular binding force of the cotton fiber amorphous region is weaker than that of the crystalline region, the structure is relatively loose, and it is easy to slip under the action of external force. When sodium periodate oxidizes cotton fabric, it is easy to enter the loose amorphous phase reaction of the fiber structure, the hydrogen bond of the fiber macromolecule is destroyed, and the weak structure is continuously peeled off, so that the weak structural phase of the fiber is reduced, so that the cotton The slip and deformation of the macromolecules are reduced by the fibers under external force. After treatment with sericin solution, the wrinkle recovery angle of the oxidized cotton fabric is further increased. This is because the aldehyde group formed by oxidation of the cotton fabric forms a covalent bond with the sericin. After grafting the protein, the fiber is asked. The hydrogen bond and other secondary structures increase, the protein forms covalent crosslinks inside the fiber and adsorbs on the surface of the fiber to form a film, thereby hindering the movement of the fiber macromolecule, improving the dimensional stability of the fabric, and making the wrinkle recovery angle of the cotton fabric. Increase.

2.1.2 Effect of different sericin concentration on wrinkle recovery performance of cotton fabric

Table 2 is a table of anti-wrinkle performance parameters of oxidized cotton fabric (4 g/L sodium periodate) before and after treatment with different concentrations of sericin solution. It can be seen from the table that after the treatment of the oxidized cotton fabric with the sericin solution, the sharp and slow-folding complex angles are obviously improved. With the increase of the concentration of the sericin solution, the wrinkle and the complex angle of the cyanide cotton fabric slightly increase, but the change Not much because the aldehyde-based sericin molecule on the oxidized cotton fabric has a covalent cross-linking reaction, the wrinkle recovery angle of the cotton fabric is increased. With the increase of the concentration of the sericin door solution, the viscosity of the solution also increases, which causes the movement of the protein macromolecular segment in the solution to be restricted, making it difficult for the protein to enter the internal reaction of the fiber, thereby further improving the sericin solution. The effect of the concentration on the wrinkle recovery angle of the fabric is not significant.

2.2 The effect of sericin on the water absorption of cotton fabrics

Table 3 is a table showing the water absorption performance parameters of the oxidized cotton fabric treated with the raw cotton fabric, the oxidized cotton fabric (4 g/L NalO4) and the sericin solution. Table 3 shows that a certain concentration of sodium periodate oxidation is beneficial to the improvement of the water absorption of the cotton fabric, and the water absorption of the oxidized cotton fabric after the treatment with the sericin solution is effectively improved. Since the cotton fabric is oxidized by sodium periodate, the compact structure becomes loose, and water molecules easily enter the interior of the cotton fabric structure, so the water absorption is improved. The oxidized cotton fabric treated by sericin coating has a large amount of one OH and one NH2 introduced on the fabric surface due to the crosslinking reaction between the amino group on the molecule of the sericin egg latch and the aldehyde group on the oxidized cotton fabric. Hydrophilic groups such as -COOH, combined with hydrogen bonding and van der Waals interaction, are more combined in the form of ions and coordinate bonds, which enhances the ability of the fabric surface to absorb moisture. Therefore, the treatment of sericin can improve the cotton fabric. Water absorption performance.

3 conclusions

(1) With the increase of oxidant concentration, the wrinkle resistance of cotton fabric increased, and the wrinkle resistance of oxidized cotton fabric was further improved after treatment with sericin solution, but the effect of the change of sericin solution on the wrinkle resistance of oxidized cotton fabric Not big.

(2) The cotton fabric is improved in water absorption after being oxidized by a certain concentration of sodium periodate; the water absorption of the oxidized cotton fabric after being treated with sericin solution is obviously improved.

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