A composite fabric modifier and a method for co-modifying cotton fabric thereof

Abstract

The application discloses a composite fabric modifier and a method for co-modifying cotton fabric by using a silk fibroin molecule, honeysuckle extract and citric acid compound modifier. The silk fibroin molecule has excellent strength and toughness, can increase the tensile resistance and wear resistance of the cotton fabric, and makes the cotton fabric have a longer service life. Active ingredients in the honeysuckle extract can interact with the surface of cotton fabric fibers to form a protective film, thereby improving the water resistance and durability of the cotton fabric. The citric acid can improve the softness and gloss of the cotton fabric, so that the cotton fabric is more comfortable. By optimizing the ratio of the three and synergistic effect, the comprehensive performance of the fabric is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fabric modification, and particularly relates to a composite fabric modifier and a method for co-modifying a cotton fabric. BACKGROUND

[0002] In daily life, people will come into contact with a large number of harmful microorganisms, which will multiply in large quantities under suitable environmental conditions and spread diseases through contact, affecting people's health. Secondly, ultraviolet rays are a kind of light wave in sunlight that is harmful to the human body. Excessive exposure to ultraviolet rays can cause skin redness, dark spots, skin aging, and even skin cancer. With the improvement of people's health and hygiene awareness, antibacterial and anti-ultraviolet textiles are increasingly favored by people.

[0003] Cotton fabric is soft, comfortable to wear, moisture-wicking and breathable, and is deeply loved by people, but it also has some defects, such as poor elasticity, easy wrinkling, poor garment shape retention, poor anti-ultraviolet performance, etc. Therefore, it is necessary to use suitable finishing agents to improve the performance of cotton fabric.

[0004] Silk fibroin has no toxicity, no irritation, good biocompatibility, degradability, excellent mechanical properties and processability, and has been widely used in textile functional finishing as a natural "green finishing agent". The main chemical component of honeysuckle, chlorogenic acid, is a natural polyphenol that can protect collagen from damage by active oxygen free radicals and effectively prevent ultraviolet rays from damaging human skin, and can impart better performance to fabrics.

[0005] However, the current fabric finishing agents all have the problem of insufficient durability. After the fabric is washed and used for many times, the functional components may gradually be lost or washed away, resulting in reduced functionality. Therefore, it is necessary to develop a composite fabric modification treatment agent with composite functions and long durability. SUMMARY

[0006] This section aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0007] In view of the above and / or problems existing in the prior art, the present application is proposed.

[0008] Therefore, the purpose of the present application is to overcome the deficiencies in the prior art and provide a composite fabric modifier.

[0009] To solve the above technical problems, the application provides the following technical scheme: comprising, silk fibroin, citric acid and honeysuckle extract;

[0010] The concentration of the silk fibroin is 8-12%, the concentration of the citric acid is 6-12%, the concentration of the honeysuckle extract is 6-10%, and the rest is deionized water.

[0011] As a preferred scheme of the composite fabric modifier, the concentration of the silk fibroin is 8-10%.

[0012] As a preferred scheme of the composite fabric modifier, the concentration of the citric acid is 8-12%.

[0013] As a preferred scheme of the composite fabric modifier, the concentration of the honeysuckle extract is 6-8%.

[0014] Another object of the application is to provide a method for modifying cotton fabric by using the composite fabric modifier.

[0015] To solve the above technical problems, the application provides the following technical scheme: comprising,

[0016] The cotton fabric is immersed in the finishing liquid, and then pre-drying, baking, washing and drying are sequentially performed, so that the modified cotton fabric is obtained.

[0017] As a preferred scheme of the method for modifying cotton fabric by using the composite fabric modifier, the cotton fabric is immersed in the finishing liquid, and the immersion temperature is 40-80 DEG C, and the immersion time is 30-60 min.

[0018] As a preferred scheme of the method for modifying cotton fabric by using the composite fabric modifier, the pre-drying temperature is 80 DEG C, and the pre-drying time is 5 min.

[0019] As a preferred scheme of the method for modifying cotton fabric by using the composite fabric modifier, the baking temperature is 160 DEG C, and the baking time is 3 min.

[0020] If the baking temperature is too high, the citric acid in the finishing liquid will become aconitic acid, which will cause the fabric to be seriously yellow; if the temperature is too low, the cross-linking reaction cannot be ensured to proceed, therefore, the above pre-drying and baking conditions can ensure that the cross-linking reaction effectively proceeds and the damage to the cotton fabric is small.

[0021] As a preferred scheme of the method for modifying the cotton fabric by the composite fabric modifier, the cotton fabric has a bacteria inhibition rate of 100% to Staphylococcus aureus and Escherichia coli, and the bacteria inhibition rate is still > 95% after 30 times of washing.

[0022] As a preferred scheme of the method for modifying the cotton fabric by the composite fabric modifier, the cotton fabric has a UPF value of > 120, and the UPF value is still > 100 after 20 times of washing.

[0023] The present application has the following beneficial effects:

[0024] The present application provides a composite fabric modifier and a method for modifying a cotton fabric by the composite fabric modifier, which is a fabric modifier composed of silk fibroin molecules, honeysuckle extract and citric acid. The silk fibroin molecules have excellent strength and toughness, which can increase the tensile resistance and wear resistance of the cotton fabric, so that the cotton fabric has a longer service life. The active ingredients in the honeysuckle extract can interact with the surface of the cotton fabric fibers to form a protective film, thereby improving the water resistance and durability of the cotton fabric. The citric acid can improve the softness and gloss of the cotton fabric, so that the cotton fabric is more comfortable. By optimizing the ratio of the three components and synergistic effect, the comprehensive performance of the fabric is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] 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. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0026] Figure 1 It is a longitudinal scanning electron microscope image of the cotton fabric before and after the treatment of the present application embodiment 1.

[0027] Figure 2 It is a DTA thermal analysis graph of the cotton fabric before and after the treatment of the present application embodiment 1. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present application more apparent and easy to understand, the specific implementation of the present application will be described in detail in the following description.

[0029] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0030] Secondly, the "one embodiment" or "embodiment" referred to herein is intended to mean a specific feature, structure, or characteristic under at least one implementation of the application. The appearances of "in one embodiment" at various places in this specification do not necessarily all refer to the same embodiment, although they can. Furthermore, described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0031] The preparation method of the silk fibroin solution in the application is as follows:

[0032] The sericin in the silk is removed, and the silk of the silkworm is spun in a 3g / L Na2CO3 boiling solution, and degumming is carried out twice, each for 1h, and the bath ratio is 1:50. Then, the degummed fabric is placed in a calcium chloride, ethanol and water (CaCl2:C2H5OH:H2O=1:2:8 molar ratio) solution at 80℃ for 1.5h, the silk fibroin solution is dialyzed in flowing pure water for 3 days using a dialysis bag, finally, 3mol / L HCl with a volume ratio of 3:100 is added to the silk fibroin solution, and the degradation is carried out at 80℃ for 2h, and the silk fibroin solution is prepared.

[0033] The preparation method of the honeysuckle extract in the application is as follows:

[0034] The preparation method of the honeysuckle extract is an ethanol extraction method, and the main component extracted is chlorogenic acid. The main method is as follows: an ethanol aqueous solution (the volume fraction of ethanol is 75%) is configured, dry honeysuckle is put into the ethanol aqueous solution, the solid-liquid ratio is 1:25 (g:mL), the extraction temperature is 90℃, and the extraction time is 120min, then filtration and drying are carried out, and the honeysuckle extract is obtained, and the extraction rate of chlorogenic acid is 89%

[0035] The cotton fabric (440 roots / 10cm*350 roots / 10cm) and the silk of the silkworm are used in the application.

[0036] Test method:

[0037] 1. Fabric UPF value and washing resistance determination: referring to GB / T 18830-2002 "Evaluation of Anti-ultraviolet Performance of Textiles", using YG(B)912E type textile anti-ultraviolet performance tester, the ultraviolet transmittance of the cotton fabric before and after treatment is tested, and the anti-ultraviolet effect of the fabric is evaluated by the ultraviolet protection factor UPF value. The higher the UPF value, the better the anti-ultraviolet performance of the fabric. Referring to GB / T 3921-2008 "Textile Color Fastness Test Soap Washing Color Fastness", the modified cotton fabric is washed with a soap washing solution, and is dehydrated and dried, and then the UPF value of the modified cotton fabric after washing is determined, and the washing resistance is determined.

[0038] 2. Fabric antimicrobial rate and washing resistance test: The antimicrobial properties of the treated and untreated cotton fabric were evaluated according to GB / T 20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: shaking flask method". The test bacteria were Staphylococcus aureus (ATCC 6538) and Escherichia coli (ATCC 25922), which were representative of gram-positive and gram-negative bacteria. The shaking flask method was used to calculate the antimicrobial rate. The modified cotton fabric was washed with a soaping solution according to GB / T 3921-2008 "Textile color fastness test: soaping fastness", and then dehydrated and dried. The antimicrobial rate of the modified cotton fabric after washing was measured to determine its washing resistance.

[0039] 3. Fabric crease recovery performance test: The fabric crease recovery performance was tested according to GB / T 3819-1997 "Determination of fabric crease recovery". The weight of the weight was 1 kg, and the compression time was 5 min. The sample was measured at 15 s for the quick elastic recovery angle, and at 5 min for the slow elastic recovery angle.

[0040] 4. Scanning electron microscope (SEM) test: A Quanta200 scanning electron microscope was used to observe the morphology of the sample surface after gold spraying treatment. The scanning voltage was 2-5 kV, the temperature was 20°C, and the relative humidity was 65%.

[0041] 5. DTA thermal analysis: A CDR-4 differential thermal analyzer was used with a heating rate of 10°C / min, a scanning temperature of room temperature-600°C, air as nitrogen, and a flow rate of 120 mL / min.

[0042] Example 1

[0043] This example provides a method for co-modifying cotton fabric with a composite fabric modifier, specifically:

[0044] The finishing solution was prepared according to the following proportions:

[0045] 8% silk fibroin, 8% citric acid, 6% honeysuckle extract, and the balance was deionized water;

[0046] The cotton fabric was immersed in the finishing solution at 60°C for 45 min at a bath ratio of 1:50, then pre-dried at 80°C for 5 min, baked at 160°C for 3 min, and finally washed and dried to obtain the cotton fabric co-modified with the composite fabric modifier.

[0047] Figure 1The longitudinal scanning electron micrographs of the cotton fabric before and after treatment (a, b) are shown in the figure. It can be seen from the figure that the surface of the cotton fiber before treatment is relatively smooth, while the surface of the cotton fiber after treatment is relatively rough and has scratches. This is mainly because chemical bonds are formed between the silk fibroin molecules and the cotton fibers, and during the rinsing process, part of the weak structure is washed away, thereby causing the stripping effect on the cotton fibers and leaving scratches on the fiber surface. It can also be seen from figure b that there are obvious attachments on the surface of the treated cotton fibers, indicating that the silk fibroin has been grafted onto the cotton fibers under the crosslinking action of citric acid, making the fibers more tightly combined.

[0048] Figure 2 The DTA thermal analysis graph of the cotton fabric before and after treatment (a, b) is shown in the figure. It can be seen that the maximum endothermic decomposition temperature of the untreated cotton fiber is 363.57°C, while the maximum endothermic decomposition temperature of the treated cotton fiber is 376.62°C. That is, after treatment with the silk fibroin solution, the maximum endothermic decomposition temperature of the cotton fiber shifts to a higher temperature direction, proving that under the crosslinking action of citric acid, crosslinking reactions occur between the silk fibroin molecules and the cotton fibers, enhancing the intermolecular forces and making the structure of the treated cotton fiber more compact.

[0049] At the same time, the heat decomposition enthalpy of the treated cotton fiber increases from 175.68 J / g before treatment to 191.17 J / g, indicating that the thermal stability of the silk fibroin treated cotton fiber has improved, and also reflecting that chemical bond crosslinking reactions occur between the silk fibroin molecules and the cotton fibers, forming stable covalent bond combinations, thereby increasing the binding energy of the cotton fibers, and thus increasing the energy required for thermal decomposition.

[0050] Comparative Example 1

[0051] The difference between this comparative example and Example 1 is that the formula of the finishing liquid is adjusted, and only silk fibroin and citric acid are used to treat the fabric, specifically:

[0052] The finishing liquid is configured according to the following formula:

[0053] 8% silk fibroin, 8% citric acid, and the balance is deionized water;

[0054] The remaining process steps are the same as those of Example 1, and the modified cotton fabric of this comparative example is obtained.

[0055] Comparative Example 2

[0056] The difference between this comparative example and Example 1 is that the formula of the finishing liquid is adjusted, and only citric acid and honeysuckle extract are used to treat the fabric, specifically:

[0057] The finishing liquid is configured according to the following formula:

[0058] 8% citric acid, 6% honeysuckle extract, and the balance is deionized water;

[0059] The remaining process steps are the same as in Example 1 to obtain the modified cotton fabric of the present comparative example.

[0060] Comparative Example 3

[0061] The present comparative example differs from Example 1 in that the modification step is adjusted, the silk fibroin modification is followed by the second treatment of the fabric with honeysuckle, specifically:

[0062] The finishing liquid is prepared according to the following formulation:

[0063] 8% silk fibroin, 8% citric acid, and the balance deionized water to obtain a silk fibroin solution;

[0064] 6% honeysuckle extract, 8% citric acid, and the balance deionized water to obtain a honeysuckle extract solution;

[0065] The cotton fabric is placed in the above-mentioned silk fibroin solution and immersed at 60°C for 45 min, then the silk fibroin modified cotton fabric is placed in the above-mentioned honeysuckle solution and immersed at 60°C for 45 min, then pre-dried at 80°C for 5 min, baked at 160°C for 3 min, and finally washed and dried to obtain the modified cotton fabric of the present comparative example.

[0066] The UPF value, antibacterial rate, wrinkle resistance, and wash resistance of the cotton fabrics of Example 1 and Comparative Examples 1-3 are determined, and the results are shown in Tables 1-4.

[0067] Table 1 UPF value of cotton fabric obtained by different modification methods

[0068]

[0069] As can be seen from Table 1, the anti-ultraviolet performance of the cotton fabric is improved after treatment with the silk fibroin solution, and the anti-ultraviolet performance is significantly improved after treatment with the honeysuckle solution alone, with a UPF value of 78. This is mainly because the tryptophan and tyrosine in silk fibroin can absorb ultraviolet light, and the main component of honeysuckle, chlorogenic acid, can protect collagen from damage by active oxygen free radicals, effectively preventing ultraviolet light. The anti-ultraviolet performance is significantly improved by compounding silk fibroin, citric acid, and honeysuckle extract.

[0070] Table 2 Antibacterial rate of cotton fabric obtained by different modification methods

[0071]

[0072]

[0073] From Table 2, it can be seen that the untreated cotton fabric has a low antibacterial rate against Staphylococcus aureus and Escherichia coli, and the antibacterial rate is slightly increased after treatment with the silk fibroin solution, and the antibacterial rate is significantly increased after treatment with the honeysuckle solution alone, reaching 85.6% and 83.3% respectively. The main component of honeysuckle is chlorogenic acid, which has a significant antibacterial effect and a strong inhibitory effect on gram-positive bacteria and gram-negative bacteria. From Table 4 and Table 5, it can be seen that the cotton fabric treated with silk fibroin first and then treated with honeysuckle twice has an antibacterial rate of 96.5% and 94.7% against Staphylococcus aureus and Escherichia coli respectively.

[0074] Table 3: Anti-wrinkle performance of cotton fabrics obtained by different modification methods

[0075]

[0076] Table 3 is the wrinkle recovery angle of the treated cotton fabric. As can be seen from the table, the wrinkle recovery of the cotton fabric treated with silk fibroin and honeysuckle is increased. This is mainly because silk fibroin is a tough and elastic protein that enters the inside of the cotton fiber under the cross-linking action of citric acid, limiting the sliding between the macromolecular chains, thereby increasing the quick and slow elastic wrinkle recovery angles and significantly improving the anti-wrinkle performance of the fabric. Although honeysuckle itself does not have anti-wrinkle properties, citric acid is added to the honeysuckle treatment solution, which has a certain effect on improving the wrinkle recovery angle of the cotton fabric, and the honeysuckle extract can promote the repair and regeneration of the fabric fibers, and the acidity of citric acid can make the fibers more compact. The two effects synergize to improve the anti-wrinkle properties of the fabric. As can be seen from Table 3, the anti-wrinkle effect of the cotton fabric treated with the silk fibroin-honeysuckle-citric acid composite solution is the best, further indicating that under the cross-linking action of citric acid, the silk fibroin molecules and chlorogenic acid molecules are covalently bonded to the cotton fibers, and the silk fibroin, citric acid and chlorogenic acid have a good synergistic effect, which can give the cotton fabric good elastic recovery performance.

[0077] Table 4: Washing resistance of cotton fabrics obtained by different modification methods

[0078]

[0079] As can be seen from Table 4, the cotton fabric modified according to the scheme of the present application has excellent washing resistance, indicating that under the cross-linking action of citric acid, the silk fibroin molecules and chlorogenic acid molecules are covalently bonded to the cotton fibers, improving the stability of the fabric.

[0080] Example 2

[0081] This example is used to explore the influence of different concentrations of silk fibroin in finishing liquid on the modification effect of fabric. The concentration of silk fibroin in the finishing liquid formula of Example 1 is adjusted to 4%, 6%, 8%, 10%, and 12%. The remaining process steps are the same as those of Example 1. The UPF value and antibacterial rate of cotton fabric under different silk fibroin concentrations are measured, and the results are shown in Table 5.

[0082] Table 5 UPF value and antibacterial rate of cotton fabric under different silk fibroin concentrations

[0083]

[0084] As can be seen from Table 5, too high or too low concentration of silk fibroin will result in a decrease in the anti-UV performance and antibacterial performance of cotton fabric. This is because silk fibroin molecules can form a protective film on the surface of cotton fabric. When the content of silk fibroin is too high, the protective film may be too thick, affecting the air permeability and softness of cotton fabric, and hindering the contact between active ingredients in honeysuckle extract and bacteria, thereby weakening the antibacterial effect. When the content is too low, the protective film is incomplete, and the fabric is exposed to ultraviolet radiation and bacterial erosion, resulting in a decrease in fabric performance.

[0085] Example 3

[0086] This example is used to explore the influence of different concentrations of honeysuckle extract in finishing liquid on the modification effect of fabric. The concentration of honeysuckle extract in the finishing liquid formula of Example 1 is adjusted to 2%, 4%, 6%, 8%, and 10%. The remaining process steps are the same as those of Example 1. The UPF value and antibacterial rate of cotton fabric under different honeysuckle extract concentrations are measured, and the results are shown in Table 6.

[0087] Table 6 UPF value and antibacterial rate of cotton fabric under different honeysuckle extract concentrations

[0088]

[0089] As can be seen from Table 6, honeysuckle extract has a significant impact on fabric performance. Honeysuckle extract is rich in various active ingredients and has antibacterial, antioxidant, and anti-UV functions. It can provide antibacterial and anti-UV protection for cotton fabric, prolonging the service life of cotton fabric. The compounds in honeysuckle extract can interact with the amino acid residues of silk fibroin through hydrogen bonding, electrostatic interaction, or van der Waals force, which in turn changes the conformation or stability of silk fibroin, thereby synergistically affecting the function and properties of modified fabric. However, too much honeysuckle content may cause changes in fabric structure, such as disordering of fiber arrangement or increase in the covering layer, thereby reducing the antibacterial effect and anti-UV performance.

[0090] Example 4

[0091] This example is used to explore the influence of different concentrations of citric acid in the finishing liquid on the modification effect of the fabric. The concentration of citric acid in the finishing liquid formula in Example 1 is adjusted to 4%, 6%, 8%, 10%, and 12%, and the remaining process steps are the same as in Example 1. The UPF value and antibacterial rate of the cotton fabric under different concentrations of citric acid are measured, and the results are shown in Table 7.

[0092] Table 7 UPF value and antibacterial rate of cotton fabric under different concentrations of citric acid

[0093]

[0094] It can be seen that the amount of citric acid also has a certain influence on the performance of cotton fabric. A certain content of citric acid can enhance the adhesion and stability of silk fibroin molecules and honeysuckle extract on cotton fabric, prevent its shedding and loss during use, and improve the stability of cotton fabric. However, high content of citric acid not only causes the fabric to yellow, but also inhibits other components or changes their structure, thereby affecting the antibacterial and ultraviolet resistance performance.

[0095] In summary, the present application provides a composite fabric modifier and a method for co-modifying cotton fabric. The composite modifier is composed of silk fibroin molecules, honeysuckle extract, and citric acid. Silk fibroin can interact with active ingredients in honeysuckle extract to enhance the ultraviolet resistance and antibacterial performance of the fabric. Under the cross-linking action of citric acid, silk fibroin molecules and chlorogenic acid molecules form a stable covalent bond with cotton fibers. At the same time, citric acid has the ability to dissolve and chelate metal ions, while honeysuckle extract may contain trace amounts of metal ions. Citric acid can undergo complexation reaction with metal ions in honeysuckle extract to form stable complexes, reducing the content of metal ions on the surface of the fabric and reducing the occurrence of photooxidation, thereby improving the ultraviolet resistance of the fabric.

[0096] In addition, silk fibroin molecules have excellent strength and toughness, which can increase the tensile resistance and wear resistance of cotton fabric, making it have a longer service life. The active ingredients in honeysuckle extract can interact with the surface of cotton fabric fibers to form a protective film, thereby improving the water resistance and durability of cotton fabric. Citric acid can improve the softness and gloss of cotton fabric, making it more comfortable. By optimizing the ratio of the three components and their synergistic effect, the overall performance of the fabric is improved.

[0097] 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, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, and they should be covered by the scope of the claims of the present application.

Claims

1. A method for co-modifying cotton fabrics with a composite fabric modifier, characterized in that: The composite fabric modifier is composed of silk fibroin, citric acid, honeysuckle extract and deionized water. Prepare the finishing solution according to the following ratio: The concentration of the silk fibroin is 8-10%, the concentration of the citric acid is 8-12%, the concentration of the honeysuckle extract is 6-8%, and the remainder is deionized water; After the cotton fabric is immersed in the finishing solution, it is pre-dried, baked, washed and dried in sequence to obtain the modified cotton fabric. The pre-baking temperature was 80℃ and the pre-baking time was 5 minutes. The baking temperature was 160℃ and the baking time was 3 minutes.

2. The method for co-modifying cotton fabrics with the composite fabric modifier as described in claim 1, characterized in that: The cotton fabric is immersed in a finishing solution at a temperature of 40-80°C for 30-60 minutes.

3. The cotton fabric modified by the method according to any one of claims 1 to 2, characterized in that: The cotton fabric has an antibacterial rate of 100% against Staphylococcus aureus and Escherichia coli, and the antibacterial rate after 30 washes is >95%.

4. The cotton fabric as described in claim 3, characterized in that: The cotton fabric has a UPF value >120, and a UPF value >100 after 20 washes.

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