Preparation method of cotton fabric loaded with cinnamaldehyde schiff base and application thereof

Abstract

The application discloses a preparation method of a cotton fabric loaded with cinnamaldehyde Schiff base and application thereof, and comprises the following steps of pretreatment of the cotton fabric: soaking the cotton fabric in a sodium periodate aqueous solution, avoiding light reaction, washing, and preparing an oxidized cotton fabric; preparation of the cotton fabric loaded with cinnamaldehyde Schiff base: soaking the oxidized cotton fabric in a polyethyleneimine ethanol solution, washing, then soaking in a sodium borohydride ethanol solution, washing, finally stirring and reacting in a cinnamaldehyde ethanol solution, taking out, washing, drying, and obtaining the cotton fabric loaded with cinnamaldehyde Schiff base. The cotton fabric has the advantages of absorbing ultraviolet light and near-infrared light, antibacterial property, improved hydrophobicity of the cotton fabric, and improved wrinkle resistance of the cotton fabric.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of functional cotton fabric preparation, and particularly relates to a preparation method of a cotton fabric loaded with cinnamaldehyde Schiff base and application thereof. BACKGROUND

[0002] In spring and summer, the sunlight is accompanied by a large amount of ultraviolet and infrared light. Appropriate ultraviolet light can promote the absorption of calcium, and appropriate infrared light can promote local circulation and strengthen body metabolism. However, excessive ultraviolet and infrared light not only harms the human body, but also causes skin redness, aging, and even skin cancer. At present, anti-ultraviolet textiles are favored by people, but the anti-ultraviolet and anti-infrared performance of cotton fabric is poor, which hinders the application of cotton fabric to some extent. At the same time, people have higher and higher requirements for the antibacterial performance of textiles. Therefore, the research and development of multifunctional cotton fabric has become an important research direction. SUMMARY

[0003] This section aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments.

[0004] As one aspect of the present application, the present application provides a preparation method of a cotton fabric loaded with cinnamaldehyde Schiff base, which consists of the following steps,

[0005] Pretreatment of the cotton fabric: the cotton fabric is soaked in a sodium periodate aqueous solution, and a light-proof reaction is carried out, then washed to prepare an oxidized cotton fabric;

[0006] Preparation of the cotton fabric loaded with cinnamaldehyde Schiff base: the oxidized cotton fabric is soaked in a polyethyleneimine ethanol solution, washed, then soaked in a sodium borohydride ethanol solution, washed, finally stirred and reacted in a cinnamaldehyde ethanol solution, taken out, washed, and dried to obtain the cotton fabric loaded with cinnamaldehyde Schiff base.

[0007] As a preferred scheme of the preparation method of the cotton fabric loaded with cinnamaldehyde Schiff base: the concentration of the sodium periodate aqueous solution is 0.04-0.06 g / mL.

[0008] As a preferred scheme of the preparation method of the cotton fabric loaded with cinnamaldehyde Schiff base: the light-proof reaction is carried out at 35-40℃ for 4-5 h.

[0009] As a preferred scheme of the preparation method of the cotton fabric loaded with cinnamaldehyde Schiff base: in the pretreatment of the cotton fabric, the washing is first carried out by soaking the cotton fabric in a 0.0062 g / mL ethylene glycol aqueous solution for 0.5 h, and then washing the cotton fabric with water.

[0010] As a preferred scheme of the preparation method of the cotton fabric loaded with cinnamaldehyde Schiff base according to the present application: the concentration of the polyethyleneimine ethanol solution is 0.04 g / mL.

[0011] As a preferred scheme of the preparation method of the cotton fabric loaded with cinnamaldehyde Schiff base according to the present application: the cotton fabric is soaked in the polyethyleneimine ethanol solution at 35℃ for 16 h.

[0012] As a preferred scheme of the preparation method of the cotton fabric loaded with cinnamaldehyde Schiff base according to the present application: the soaking in the sodium borohydride ethanol solution is carried out in a 0.024 g / mL sodium borohydride ethanol solution at 25℃ for 1 h.

[0013] As a preferred scheme of the preparation method of the cotton fabric loaded with cinnamaldehyde Schiff base according to the present application: the stirring reaction in the cinnamaldehyde ethanol solution is carried out in a 0.02-0.18 g / mL cinnamaldehyde ethanol solution under a water bath at 55℃ for 3 h.

[0014] As a preferred scheme of the preparation method of the cotton fabric loaded with cinnamaldehyde Schiff base according to the present application: the drying is carried out at a temperature of 45-60℃

[0015] The present application also provides the application of the cotton fabric prepared by the preparation method in the preparation of functional cotton fabric, characterized in that the cotton fabric has the functions of absorbing ultraviolet light and near-infrared light, antibiosis, improving the hydrophobicity of the cotton fabric and improving the wrinkle resistance of the cotton fabric.

[0016] The present application has the following advantages: the present application uses sodium periodate, polyethyleneimine and cinnamaldehyde as raw materials to prepare cinnamaldehyde Schiff base in situ on the cotton fabric pretreated by sodium periodate. The ultraviolet-visible near-infrared spectrum shows that the cotton fabric loaded with cinnamaldehyde Schiff base can absorb ultraviolet light and near-infrared light. When the concentration of cinnamaldehyde is 0.10 g / L, the UPF of the cotton fabric loaded with cinnamaldehyde Schiff base can reach 136.5, and the antibacterial rate against Escherichia coli and Staphylococcus aureus can reach 100%. The crease recovery angle and the contact angle of the finished cotton fabric are increased. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor. Among them:

[0018] Figure 1 Schematic diagram for pretreatment of cotton fabric.

[0019] Figure 2 Schematic diagram for preparation of cotton fabric loaded with cinnamaldehyde Schiff base.

[0020] Figure 3 SEM photos of cotton fabric before and after finishing.

[0021] Figure 4 EDS spectrum of cotton fabric before and after finishing.

[0022] Figure 5 FTIR spectrum of cotton fabric before and after finishing.

[0023] Figure 6 XPS spectrum of cotton fabric before and after finishing.

[0024] Figure 7 Absorption spectrum of cotton fabric before and after finishing.

[0025] Figure 8 Antibacterial performance of cotton fabric before and after finishing against E. coli.

[0026] Figure 9 Antibacterial performance of cotton fabric before and after finishing against S. aureus.

[0027] Figure 10 Contact angle of cotton fabric before and after finishing. DETAILED DESCRIPTION

[0028] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below.

[0029] (1) Pretreatment of cotton fabric: 0.6 g of cotton fabric was soaked in an aqueous sodium periodate solution (0.04 g / mL, 50 mL) and reacted at 40°C in the dark for 4 h. After taking out, the cotton fabric was soaked in an aqueous ethylene glycol solution (0.0062 g / mL, 50 mL) for 0.5 h, and then washed with deionized water to remove unreacted sodium periodate and ethylene glycol. Thus, an oxidized cotton fabric was obtained. The reaction process is shown in Figure 1 .

[0030] (2) Preparation of cotton fabric loaded with cinnamaldehyde Schiff base: The oxidized cotton fabric was soaked in a polyethyleneimine ethanol solution (0.04 g / mL, 50 mL) at 35°C for 16 h, and then taken out and washed with deionized water. Then, the cotton fabric was soaked in a sodium borohydride ethanol solution (0.024 g / mL, 50 mL) at 25°C for 1 h, and then taken out and washed with deionized water. Finally, the cotton fabric was stirred in different concentrations of cinnamaldehyde (C9H8O) (0.02 g / mL, 0.10 g / mL, 0.18 g / mL) in ethanol solution (50 mL) at 55°C under water bath conditions for 3 h, and then taken out, washed with deionized water, and dried at 50°C. The reaction process is shown in Figure 2 .

[0031] Surface morphology observation: Nova NanoSEM 450 scanning electron microscope (SEM, FEI Company, USA) was used to observe the appearance and morphology of the surface of the fabric before and after finishing. It is to use electron beam to bombard the surface of the sample to be tested, and the secondary electrons and backscattered electrons generated by the interaction of electrons and sample are used to analyze the surface morphology of the sample, and the magnified image of the microstructure of the sample is obtained. The sample to be tested was cut into 1 cm x 1 cm size, and the sample to be tested was attached to the test platform with conductive glue. After gold spraying treatment, the scanning electron microscope was used for observation, and the observation magnification was 500 times, 2500 times and 5000 times, respectively. The test voltage was 5000V, and the vacuum degree was 1.15 x 10 3 Pa, and finally the fabric image was observed on the computer and needed to be photographed.

[0032] Chemical composition analysis: In order to determine the change of element types on the surface of the fabric before and after finishing, EDS energy spectrum analysis was carried out on the fabric. The composition analysis was carried out by different X-ray photon characteristic energies of different elements. The change of chemical element composition on the surface of the sample before and after finishing was analyzed by using the different energy emitted by each kind of atom in transition.

[0033] NEXUF-670 Fourier transform infrared spectrometer (FTIR, NICOLET Company, USA) was used to analyze the functional groups of the fabric before and after finishing. The sample to be tested was cut into 2 cm x 2 cm size and placed under the Fourier transform infrared spectrometer. The test scanning range was 4000-500 cm -1 , the resolution was 4 cm -1 , and the scanning times were 32 times. The strength of the characteristic absorption peak can be used to represent the grafting effect of the group on the cotton fabric. The fabric needs to be dried before testing to ensure that the moisture is completely removed.

[0034] X-ray photoelectron spectrometer (XPS, Thermoelectric Company, USA) was used to characterize the element composition, element content and chemical valence state of the fabric surface. The modified cotton fabric was cut into 1 cm x 1 cm size and placed under the X-ray spectrometer. The binding energy of the sample surface was scanned from 0 to 1000 ev with a resolution of 0.5 ev. The energy spectrum of the fabric before and after finishing was analyzed by X-ray photoelectron spectrometer, so as to determine the grafting of cinnamaldehyde Schiff base on the finished cotton fabric.

[0035] Absorption spectrum analysis: The UV and infrared absorption of the fabric before and after finishing was analyzed by UV-3600Plus UV-Vis-NIR spectrophotometer (UV-VIS-NIR, Shimadzu, Japan). The vibration frequency of the group in the molecule is the same as the frequency of the infrared light, and the infrared absorption spectrum is obtained when the group absorbs infrared light and jumps. The absorption performance of the sample to infrared and ultraviolet was analyzed. The sample to be tested was cut into 1x1cm size, placed under the spectrometer, and the integral sphere mode was used to obtain the light absorption data.

[0036] Performance test:

[0037] Ultraviolet resistance: According to GB / T 18830-2009 "Evaluation of the ultraviolet resistance of textiles", the standard for fabric to have ultraviolet resistance is that the UPF value is greater than 30 and the ultraviolet transmittance is less than 5%. Under the condition of meeting the ultraviolet resistance, the smaller the value, the better the ultraviolet resistance of the fabric. The raw cotton and the sample after finishing were cut into circular samples with a diameter greater than 45mm, the instrument was preheated for 10min, the sample was placed in the sample chamber, the total spectrum transmittance was measured, and the UPF value of the sample was obtained.

[0038] Antibacterial property: According to GB / T 20944.3-2008 "Evaluation of the antibacterial property of textiles Part 3: shaking method". Typical colonies were selected from 3-10 generations of preserved bacteria and inoculated into 20mL nutrient broth, and then incubated at 37℃ for 18-20h. Then 2mL of the initial bacterial solution was diluted to a certain concentration with broth and phosphate buffer (PBS). 0.75g of the sample to be tested and standard cotton (original sample) were cut into 5mmx5mm pieces and placed in the diluted bacterial solution, and then incubated in a 24℃ shaking incubator for 18-24h. 1mL was taken from each group of samples, diluted to an appropriate multiple by 10 times, and plated for 24-48h. Two parallel samples were set for each group of samples, and the number of colonies on the plate was recorded. The colonies used in this experiment were Escherichia coli and Staphylococcus aureus. The antibacterial rate was calculated according to the following formula.

[0039]

[0040] In the formula, Y: sample antibacterial rate;

[0041] W t : The number of colonies on the plate after 18h shaking contact of the original sample;

[0042] Q t : The number of colonies on the plate after 18h shaking contact of the sample.

[0043] Hydrophilicity: According to GB / T 14210 "Standard for Contact Angle Testing", the raw cotton and the finished cotton fabric were cut into 1 cm × 1 cm pieces and pasted on a glass slide. The glass slide was placed on the operating table, and about 0.6 - 1.0 μL of deionized water was extruded using a micro syringe. The contact state of the water droplet was photographed through a contact angle measuring instrument, and the size of the contact angle was measured through software. Each sample was tested three times, and the average value was calculated.

[0044] Crease recovery: According to GB / T 3819-1997 "Textiles - Determination of the crease recovery of fabrics - Recovery angle method", the warp and weft direction acute elastic crease recovery angles and slow elastic crease recovery angles of the cotton fabric before and after finishing were tested. Five "convex" shaped samples were cut along the warp and weft directions from the raw cotton and the finished samples respectively, and were pressed with a 10 N weight for 15 s and 5 min respectively. The recovery angle values of each group were recorded, and the average value was obtained.

[0045] Experimental results:

[0046] SEM and EDS analysis: The SEM photos (500 times, 2500 times and 5000 times) of the cotton fabric before and after finishing are as Figure 3 shown. It can be seen from the pictures that the fiber surface of the raw cotton fabric is smooth and has natural twists longitudinally; the surface of the finished cotton fabric becomes rough, which is due to the in-situ synthesis of cinnamaldehyde Schiff base on the cotton fabric. Figure 3 The SEM photos of the cotton fabric before and after finishing are: (a) Raw cotton fabric before finishing (×500); (b) Raw cotton fabric before finishing (×2500); (c) Raw cotton fabric before finishing (×5000); (d) Finished cotton fabric after finishing (×500); (e) Finished cotton fabric after finishing (×2500); (f) Finished cotton fabric after finishing (×5000). Figure 4 The EDS energy spectrum diagrams of the cotton fabric before and after finishing are: (a) Raw cotton fabric before finishing; (b) Finished cotton fabric after finishing (0.02 g / mL); (c) Finished cotton fabric after finishing (0.10 g / mL); (d) Finished cotton fabric after finishing (0.18 g / mL). The loading of cinnamaldehyde Schiff base can be analyzed by the elemental changes on the fabric surface. The EDS spectra of the cotton fabric before finishing and after finishing with different concentrations of cinnamaldehyde ethanol solution are as Figure 4 shown. It can be seen that there are C and O elements in the fabric before finishing, and an additional N element appears on the surface of the finished cotton fabric. This may be because polyethyleneimine reacts with the aldehyde groups on the oxidized cotton fabric, and polyethyleneimine is grafted onto the cotton fabric. Polyethyleneimine contains amino groups. From the percentage of C element content before and after finishing, the percentage of C element becomes more after finishing. According to the experimental drugs used, the increase in C element content is due to the grafting of cinnamaldehyde onto the polyethyleneimine long chain. From the above analysis, cinnamaldehyde Schiff base has been successfully prepared on the cotton fabric.

[0047] Figure 5 FTIR spectra of cotton fabrics before and after finishing: (a) cotton fabric before finishing; (b) cotton fabric after finishing. FTIR analysis: FTIR spectra of cotton fabrics before and after finishing are shown below. Figure 5 As shown. Curve a is the infrared spectrum of the fabric before finishing, 3338 cm⁻¹. -1 The region is characterized by OH stretching vibrations and associated hydrogen bonds, 2913 cm⁻¹ -1 The value at 1670 cm⁻¹ represents the CH stretching vibration in -CH₂. Curve b is the infrared spectrum of the treated cotton fabric; compared to the original cotton fabric, the wavelength at 1670 cm⁻¹ is significantly different. -1 A new absorption peak appears at 1631 cm⁻¹, because the formed C=N exhibits stretching vibrations at that location. -1 Furthermore, peaks different from those in the original cotton were observed in the fingerprint area, which may be due to the C=C vibration in the benzene ring skeleton. Based on the above peak analysis, it can be concluded that cinnamaldehyde Schiff base was synthesized on the cotton fabric.

[0048] XPS Analysis: XPS spectra of cotton fabrics before and after finishing are as follows Figure 6 As shown in the figure, curve a is the full XPS spectrum of the original cotton fabric, which only shows peaks for C and O elements. However, curve b shows an N peak in the full XPS spectrum of the treated cotton fabric. Analysis of the experimental principle indicates that this is due to the reaction between the amino groups in polyethyleneimine and the aldehyde groups in the oxidized cotton fabric, resulting in the grafting of polyethyleneimine onto the cotton fabric. Comparing the relative peak heights of C and O in the spectrum of the treated cotton fabric with those in the spectrum of the untreated cotton fabric, a significant increase in the relative peak height of C is observed. This is likely due to the reaction of cinnamaldehyde with polyethyleneimine. Cinnamaldehyde contains a benzene ring, causing the increase in the relative peak height of C. Therefore, it can be inferred that a cinnamaldehyde Schiff base was synthesized on the cotton fabric. Figure 6 XPS spectra of cotton fabrics before and after finishing: (a) cotton fabric before finishing; (b) cotton fabric after finishing.

[0049] Absorption spectroscopy analysis: Absorption spectra of cotton fabrics before and after finishing are shown below. Figure 7As shown, the untreated cotton fabric exhibits some absorption in the ultraviolet (UV) band but no absorption in the infrared band. The treated cotton fabric shows a strong absorption peak in the UV wavelength range, with a maximum absorption wavelength of 250 nm and an absorbance of 1.5. Furthermore, it exhibits strong UV absorption between 250 and 350 nm. The reason the treated cotton fabric can absorb UV light is due to the typical conjugated system formed by the C=N double bond in the cinnamaldehyde Schiff base synthesized in situ on the cotton fabric and the C=C double bond in the benzene ring. In this conjugated system, the conjugated π-bond electrons are easily excited, causing the outer valence electrons of the molecule to transition. Different degrees of electron delocalization result in different UV absorption wavelengths. In the UVB (280–320 nm) band, the absorbance is around 1.2, indicating strong absorption. However, in the UVA (320–400 nm) band, the absorbance decreases from 1.2 to around 0.2. This shows that the treated cotton fabric has poorer absorption of long-wave ultraviolet (UVA) than medium-wave ultraviolet (UVB). In the near-infrared region (750–2500 nm), the absorbance exhibits a wave-like progression. This is because the -NH2 in the treated cotton fabric causes a change in the dipole moment of the molecules in the infrared region, resulting in some absorption of infrared radiation. Figure 7 Absorption spectra of cotton fabrics before and after finishing: (a) cotton fabric before finishing; (b) cotton fabric after finishing.

[0050] UV protection analysis: The UV protection properties of cotton fabrics before treatment and after treatment with different concentrations of cinnamaldehyde ethanol solution are shown in Table 1. It can be seen that the untreated cotton fabric has the lowest UPF value, indicating that the original cotton fabric has poor UV protection. With increasing cinnamaldehyde concentration, the UPF of the treated cotton fabric gradually increases.

[0051] Table 1. UV protection properties of cotton fabrics before and after finishing.

[0052] Sample UVA Transmission (%) UVB Transmission (%) Protection Factor (UPF) Cotton Fabric Before Finishing 15.02 8.16 9.80 Cotton Fabric After Finishing (0.02 g / mL) 3.2 2.8 128.6 Cotton Fabric After Finishing (0.10 g / mL) 2.7 2.6 136.5 Cotton Fabric After Finishing (0.18 g / mL) 1.5 1.3 142.4

[0053] Antibacterial analysis: Antibacterial photos of cotton fabrics against Escherichia coli and Staphylococcus aureus are shown below. Figure 8 and 9 As shown in Table 2, the antibacterial rate was tested using the vibration method on the treated cotton fabric. The experimental results are shown in the figure. The inhibition rates of the raw cotton against Escherichia coli and Staphylococcus aureus were 40.26% and 44.39%, respectively. With the increase of cinnamaldehyde concentration, the inhibition rate of the treated cotton fabric against Escherichia coli gradually increased, and remained stable at 100% when the concentration of cinnamaldehyde was 0.18 g / mL. This indicates that when the concentration of cinnamaldehyde was 0.10 g / mL, the amino groups in the polyethyleneimine grafted onto the raw cotton had completely reacted with the aldehyde groups of cinnamaldehyde. Figure 8Antibacterial properties of the cotton fabric before and after finishing against E. coli: (a) cotton fabric before finishing; (b) cotton fabric after finishing (0.02 g / mL); (c) cotton fabric after finishing (0.10 g / mL); (d) cotton fabric after finishing (0.18 g / mL). Figure 9 Antibacterial properties of the cotton fabric before and after finishing against S. aureus: (a) cotton fabric before finishing; (b) cotton fabric after finishing (0.02 g / mL); (c) cotton fabric after finishing (0.10 g / mL); (d) cotton fabric after finishing (0.18 g / mL).

[0054] Table 2 antibacterial rate of the cotton fabric before and after finishing

[0055] Sample E. coli Bacteriostatic Rate (%) S. aureus Bacteriostatic Rate (%) Cotton Fabric Before Finishing 40.26 44.39 Cotton Fabric After Finishing (0.02 g / mL) 96.75 98.23 Cotton Fabric After Finishing (0.10 g / mL) 100 100 Cotton Fabric After Finishing (0.18 g / mL) 100 100

[0056] Hydrophilicity analysis: Hydrophilicity is the property of the surface of a material that can be wetted by water. The essence of the wetting process is that the energy of the surface of the material changes. The contact state of the cotton fabric before and after finishing with water droplets is shown in Fig. 2. Figure 10 The contact angle of the cotton fabric before finishing is 85°, so the cotton fabric before finishing has hydrophilicity. The contact angle of the cotton fabric after finishing is 117°, and according to the classification standard of the contact angle, it can be known that the contact angle is below 90° for hydrophilicity and above 90° for hydrophobicity, and the cotton fabric after finishing is hydrophobic. Figure 10 Contact angle of the cotton fabric before and after finishing: (a) cotton fabric before finishing; (b) cotton fabric after finishing.

[0057] Crease recovery analysis: The crease recovery of a fabric is the ability of the fabric to return to its original state under the action of external force. The acute and slow elastic recovery angles of the cotton fabric before and after finishing are shown in Tables 3 and 4, respectively. As can be seen from Table 3, the total acute elastic crease recovery angle of the cotton fabric after finishing increases from 139° to 177°, an increase of about 20%, and the crease recovery angle of the fabric after finishing increases significantly, indicating that the crease resistance of the fabric increases significantly. It is speculated that the bending stiffness of the fabric after finishing by the method of the present application increases, and the rebound performance of the fabric improves, so the crease resistance of the cotton fabric after treatment increases significantly (P < 0.05).

[0058] Table 3 acute elastic recovery angle of the cotton fabric before and after finishing

[0059] Sample Warp Crease Recovery Weft Crease Recovery Total Crease Recovery Cotton Fabric Before Finishing 75±2.75 64±3.14 139±4.00 Cotton Fabric After Finishing (0.02 g / mL) 92±2.62 85±2.80 177±4.45 Cotton Fabric After Finishing (0.10 g / mL) 95±3.85 87±3.82 182±6.05 Cotton Fabric After Finishing (0.18 g / mL) 95±2.93 88±4.28 183±5.46

[0060] Table 4 slow elastic recovery angle of the cotton fabric before and after finishing

[0061] Sample Warp Crease Recovery Weft Crease Recovery Total Crease Recovery Cotton Fabric Before Finishing 40±2.85 32±3.40 72±3.51 Cotton Fabric After Finishing (0.02 g / mL) 39±4.07 35±2.76 74±6.52 Cotton Fabric After Finishing (0.10 g / mL) 41±2.41 35±2.62 76±4.07 Cotton Fabric After Finishing (0.18 g / mL) 42±4.07 38±2.93 80±3.61

[0062] The present application uses sodium periodate, polyethyleneimine and cinnamaldehyde as raw materials to prepare cinnamaldehyde Schiff base in situ on cotton fabric pretreated by sodium periodate. The UV-visible near infrared spectrum shows that the cotton fabric loaded with cinnamaldehyde Schiff base can absorb ultraviolet light and near infrared light. The antibacterial rate and UPF of the cotton fabric loaded with cinnamaldehyde Schiff base increase with the increase of the concentration of cinnamaldehyde. When the concentration of cinnamaldehyde is 0.10 g / L, the UPF reaches 136.5, and the antibacterial rate against Escherichia coli and Staphylococcus aureus reaches 100%. The crease recovery angle and contact angle of the finished cotton fabric increase.

[0063] Research example:

[0064] During the experiment, the concentration of polyethyleneimine Schiff base in the second step of the reaction was adjusted to explore the optimal reaction conditions, so as to achieve the expected effect of the experiment. During the experiment, when the concentration of polyethyleneimine (0.01 g / mL) is too low, the antibacterial effect of the final finished sample is poor, and even there is no antibacterial effect. When the concentration of polyethyleneimine (0.06 g / mL) is too high, the antibacterial effect of the final finished sample does not improve much.

[0065] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. The application of a cotton fabric loaded with cinnamaldehyde Schiff base in the preparation of functional cotton fabrics, characterized in that: The cotton fabric absorbs ultraviolet and near-infrared light, is antibacterial, and improves the hydrophobicity and wrinkle resistance of the cotton fabric. The method for preparing the cotton fabric loaded with cinnamaldehyde Schiff base consists of the following steps. Pretreatment of cotton fabrics: Soak cotton fabrics in sodium periodate aqueous solution, react in the dark, wash, and prepare oxidized cotton fabrics; Preparation of cotton fabric loaded with cinnamaldehyde Schiff base: The oxidized cotton fabric was soaked in an ethanol solution of polyethyleneimine, washed, then soaked in an ethanol solution of sodium borohydride, washed, and finally stirred and reacted in an ethanol solution of cinnamaldehyde. The fabric was then removed, washed, and dried to obtain cotton fabric loaded with cinnamaldehyde Schiff base. The concentration of the sodium periodate aqueous solution is 0.04~0.06 g / mL; The stirring reaction in the cinnamaldehyde ethanol solution was carried out in a 0.02~0.18 g / mL cinnamaldehyde ethanol solution under a 55°C water bath for 3 hours. In the pretreatment of the cotton fabric, the washing process involves first soaking the cotton fabric in an aqueous solution of 0.0062 g / mL ethylene glycol for 0.5 h, and then washing the cotton fabric with water. The concentration of the polyethyleneimine ethanol solution is 0.04 g / mL; the oxidized cotton fabric is soaked in the polyethyleneimine ethanol solution at 35°C for 16 h. The soaking in the sodium borohydride ethanol solution is carried out at 25°C for 1 hour in a 0.024 g / mL sodium borohydride ethanol solution.

2. The application according to claim 1, characterized in that: The light-protected reaction is carried out at 35-40 °C for 4-5 hours in the dark.

3. The application according to claim 1 or 2, characterized in that: The drying process is carried out at a temperature of 45~60℃.

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