A fiber modification method

Abstract

The present invention provides a fiber modification method. In the present invention, the fiber is first reacted with a hypochlorous acid type oxidant to form an antioxidant fiber, then the antioxidant fiber is separated from the hypochlorous acid type oxidant, and finally the antioxidant fiber is dried to form a modified fiber. The modified fiber in the present invention is characterized by having high antioxidant properties.

Description

Technical Field

[0001] The invention relates to the technical field of fiber modification, and in particular to a fiber modification method for increasing the oxidation resistance of the fiber. Background Art

[0002] Hypochlorous acid is known to be an antibacterial ingredient that can act in a variety of environments to remove microorganisms, such as viruses, bacteria, and fungi. When foreign bacteria invade the human body, the body's own immune system white blood cells will produce hypochlorous acid and begin to resist foreign bacteria and viruses, that is, to generate resistance, specifically used to destroy the protease on the cell membrane of bacteria and viruses, making bacteria and viruses unable to survive. Hypochlorous acid has the same function as the human body and has the so-called bioaffinity, so hypochlorous acid can effectively fight bacteria and is safe and non-toxic to the human body.

[0003] Hypochlorous acid is an effective and non-toxic bactericide. However, since hypochlorous acid is a strong oxidant, it has the disadvantage of poor stability during storage. Therefore, paper towels with hypochlorous acid as the main bactericidal ingredient are relatively rare on the market. Generally, alcohol is the main bactericidal ingredient. Common plastic fiber ingredients, such as polyethylene terephthalate (PET), polypropylene (PP), and rayon, also have poor antioxidant properties. Therefore, hypochlorous acid will lose its bactericidal ability after being stored for a period of time. Summary of the invention

[0004] The invention improves the oxidation resistance of plastic nonwoven fabric or fiber through fiber modification.

[0005] The present invention provides a fiber modification method. The first step is to react the fiber with an oxidant solvent to form an antioxidant fiber, then separate the antioxidant fiber from the oxidant solvent, and finally dry the antioxidant fiber to form a modified fiber.

[0006] The fiber is one of PET, PP, and Rayon, or a combination of two or more thereof.

[0007] Wherein, the concentration of the oxidant is 150-20000ppm.

[0008] Wherein, the concentration of the oxidant is preferably 150-250 ppm.

[0009] Wherein, the oxidant is a hypochlorous acid type oxidant.

[0010] Wherein, the hypochlorous acid type oxidant is sodium hypochlorite, calcium hypochlorite, magnesium hypochlorite, potassium hypochlorite, or one or a combination of two or more of hypochlorous acid.

[0011] Wherein, the temperature of the reaction between the fiber and the oxidant is 25-100°C.

[0012] The temperature at which the fiber reacts with the oxidant is preferably 50-80°C.

[0013] Wherein, the reaction time of the fiber and the oxidant is 2-168 hours.

[0014] The reaction time between the fiber and the oxidant is preferably 24-168 hours.

[0015] The present invention has at least the following beneficial effects:

[0016] The present invention improves the anti-oxidation property of plastic non-woven fabrics or fibers, and modifies the plastic fibers to improve the storage capacity of hypochlorous acid, so as to provide hypochlorous acid paper towels that can be stored for a long time and still have sterilization and cleaning effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a diagram showing the results of the storage stability heating test in Example 6;

[0018] Figure 2 This is a diagram showing the results of the storage stability heating test in Example 8;

[0019] Figure 3 This is a graph showing the results of the room temperature storage stability test. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] In order to facilitate understanding of the technical features, contents and advantages of the present invention and the effects that can be achieved, the present invention is described in detail as follows in the form of comparative example experimental data and embodiment experimental data.

[0022] The present invention provides a method for measuring the amount of free available chlorine (FAC), which is used to measure the fiber prepared by the fiber modification method of the present invention. The FAC amount includes hypochlorous acid and hypochlorite, which is used to indicate the efficacy of the present invention in the field of disinfection and sterilization.

[0023] Among them, those skilled in the art to which the present invention pertains should be aware that the higher the FAC content of the fiber, the better the sterilization effect, and the FAC content is indicated in parts per million (ppm).

[0024] In addition to expressing the FAC amount in ppm, in the long-term storage stability test, the FAC ppm after long-term storage will be compared with the initial FAC ppm. The FAC retention amount after long-term storage is compared and the value is expressed as a percentage (%). The higher the value, the more effective chlorine is retained and the better the effect.

[0025] In order to understand the stability of different fibers in long-term storage of hypochlorous acid, the present invention uses a high temperature environment to simulate a long-term room temperature storage environment to conduct a fiber storage stability test.

[0026] The storage stability test method of the present invention is to put the test product into a glass bottle with a PP cap containing a hypochlorous acid solvent (FAC: 200ppm), and then put the glass bottle into an oven and set the parameter to a temperature of 54°C for a period of 7-14 days. This parameter can simulate the storage stability of hypochlorous acid stored at room temperature for 6-12 months.

[0027] Comparative Example 1

[0028] Take the paper towels on the market that use hypochlorous acid as the main bactericidal ingredient and measure their FAC content. The measured value represents the amount of residual hypochlorous acid in the product. The results are shown in Table 1 below. It can be seen that the FAC content of commercially available hypochlorous acid paper towels is extremely low, which means that after the commercially available hypochlorous acid paper towels are transported and stored, the hypochlorous acid content is extremely low after the user purchases them, which means that the paper towels have the disadvantage of poor storage stability of hypochlorous acid.

[0029] Table 1 FAC detection of commercially available hypochlorous acid paper towels

[0030]

[0031] The storage stability results of plastic non-woven fabrics formed by common high molecular polymers, such as PET, PP and Rayon, to hypochlorous acid are shown in Table 2. It can be seen from Table 2 that the storage stability of plastic non-woven fabrics to hypochlorous acid is not good.

[0032] Table 2 Storage stability of common plastic nonwovens in hypochlorous acid

[0033]

[0034] Example 1

[0035] The steps of modifying plastic non-woven fabric with hypochlorous acid include:

[0036] S0101: Place the plastic nonwoven in a glass bottle and put it in an incubator;

[0037] S0102: Add hypochlorous acid solvent (20 times by weight of hypochlorous acid aqueous solution, pH: 6.5, FAC: 200 ppm);

[0038] S0103: Raise the temperature to 54°C and react for 14 days to allow the fiber to react with the hypochlorous acid solvent to form a modified fiber;

[0039] S0104: After the reaction is completed, take out the plastic non-woven fabric, wash it with water and dry it.

[0040] The storage stability test method of hypochlorous acid is as follows:

[0041] S0201: Seal the samples in glass bottles (100 mL) equipped with PP caps, and add hypochlorous acid solvent (20 times the weight of hypochlorous acid aqueous solution, pH: 6.19, FAC: 200 ppm);

[0042] S0202: Environmental parameters are 54°C for 7 days;

[0043] S0203: After 7 days of storage, measure the pH value and FAC content to confirm the extent to which the modification treatment improves the hypochlorous acid storage stability of the sample.

[0044] The test results are shown in Table 3 and 4. It can be seen that after the modification treatment of the present invention, the storage stability of the plastic non-woven fabric to chloric acid is improved by 1.5 times. It can be seen that the modification method in the present invention can indeed improve the storage stability of the fabric to hypochlorous acid, and the effect is significant.

[0045] Table 3 Hypochlorous acid storage stability of nonwoven fabrics before and after modification

[0046]

[0047] Example 2

[0048] The storage stability test of non-woven fabric (PET) before and after modification on hypochlorous acid includes the following steps:

[0049] S0301: Unmodified nonwoven fabric and modified antioxidant fabric were sealed in glass bottles (100 mL) with PP caps, respectively, and hypochlorous acid aqueous solvent (20 times the weight of hypochlorous acid aqueous solution, pH: 6.19, FAC: 172.7 ppm) was added, and heated and aged at 54°C for 14 days.

[0050] S0302: After 14 days of reaction, measure the pH value and FAC content.

[0051] The results are shown in Table 4, which shows that the storage stability of the modified non-woven fabric to hypochlorous acid is increased by 2 times.

[0052] Table 4 Storage stability of nonwoven fabric in hypochlorous acid before and after modification

[0053]

[0054] Example 3

[0055] The storage stability test of PET fiber before and after modification to hypochlorous acid includes the following steps:

[0056] S0401: The unmodified fiber was sealed in a glass bottle (100 mL) equipped with a PP cap, hypochlorous acid solvent (20 times the weight of hypochlorous acid aqueous solution, pH: 6.47, FAC: 200 ppm) was added and subjected to a heating aging reaction at 54°C for 7 days.

[0057] S0402: After 7 days of storage, measure pH and FAC content.

[0058] The test results are shown in Table 5. It can be seen that the storage stability of the unmodified PET fiber at 54° C. for 7 days is poor, with the FAC concentration remaining only 26 ppm and 68 ppm, and the remaining hypochlorous acid 13.0% and 34.0%.

[0059] Table 5 Hypochlorous acid storage stability of unmodified fibers

[0060]

[0061] Note: Fibers 1-2 are PET fibers of different specifications.

[0062] Example 4

[0063] The test steps for hypochlorous acid storage stability include:

[0064] S0501: The modified antioxidant PET fiber was sealed in a glass bottle (100 mL) equipped with a PP cap, hypochlorous acid solvent (20 times the weight of hypochlorous acid aqueous solution, pH: 6.54, FAC: 210 ppm) was added, and a heating aging reaction test was carried out at 54°C for 14 days.

[0065] S0502: After 14 days of storage, measure pH and FAC content.

[0066] The results are shown in Table 6. The residual hypochlorous acid is 52.9% and 50.95%, indicating that the fiber has better FAC after modification, showing that the storage stability of the fiber to hypochlorous acid can be improved after modification.

[0067] Table 6 Hypochlorous acid storage stability of modified fibers

[0068]

[0069] Note: Fibers 1-2 are PET fibers of different specifications.

[0070] Example 5

[0071] To optimize the modification time test of non-woven fabric (PET), the steps are as follows:

[0072] S0601: Place a plastic nonwoven in a glass bottle, add 80 times the weight of hypochlorous acid aqueous solution (pH: 6.5, FAC: 200 ppm) and carry out a reaction at 54°C for 1, 2, 3, 5, 7, 11 and 14 days.

[0073] S0602: After the reaction is completed, take out the plastic non-woven fabric, wash it with water and dry it for storage.

[0074] The storage stability test method of hypochlorous acid is as follows:

[0075] S0603: The modified fiber (PET) was sealed in a glass bottle (100 mL) equipped with a PP cap, and 20 times the weight of hypochlorous acid aqueous solution (pH: 6.26, FAC: 203 ppm) was added and a heat aging test was carried out at 54°C for 14 days.

[0076] S0604: After 14 days of storage, measure pH and FAC content.

[0077] The results are shown in Table 7. There is no significant difference between the modification treatments of 1-14 days, indicating that the modification treatment at 54°C for 1 day is sufficient to improve the compatibility of the plastic nonwoven fabric with hypochlorous acid. In order to save time cost, the modification treatment at 54°C for 1 day is the preferred modification treatment.

[0078] Table 7 Heating test results of nonwoven fabrics with different modification treatment times for hypochlorous acid stability

[0079]

[0080] Example 6

[0081] The steps to optimize the fiber (PET) modification treatment time are as follows:

[0082] S0701: Place the plastic fiber in a glass bottle, add 20 times the weight of hypochlorous acid aqueous solution (pH: 6.5, FAC: 200 ppm) and react at 54°C for 0, 2, 4, 6, 8, 16, 24, 48, 96 and 168 hours.

[0083] S0702: After the reaction is completed, take out the plastic fiber, wash it with water and dry it for storage.

[0084] The storage stability test method of hypochlorous acid is as follows:

[0085] S0703: The modified fiber (PET) was sealed in a glass bottle (100 mL) equipped with a PP cap, and 20 times the weight of hypochlorous acid aqueous solution (pH: 6.37, FAC: 216 ppm) was added and a heat aging test was carried out at 54°C for 14 days.

[0086] S0704: After 14 days of storage, measure pH and FAC content.

[0087] The results are shown in Table 8 and Figure 1 The results show that within 24 hours of modification treatment, the increase in modification treatment time will increase the fiber's stability to hypochlorous acid, and it reaches the maximum value after 24 hours, that is, 1 day. Thereafter, increasing the modification treatment time does not increase the fiber's stability to hypochlorous acid, indicating that 54°C modification treatment for 1 day is enough to improve the compatibility of plastic non-woven fabrics to hypochlorous acid. In order to save time cost, 54°C modification treatment for 1 day is the preferred modification treatment.

[0088] Table 8 Heating test results of hypochlorous acid stability of fibers with different modification treatment times

[0089]

[0090] Example 7

[0091] Optimize the test of non-woven fabric (PET) room temperature modification treatment time, the steps are as follows:

[0092] S0801: Place a plastic nonwoven in a glass bottle, add 80 times the weight of an aqueous solution of hypochlorous acid (pH: 6.5, FAC: 200 ppm), and react at room temperature (25° C.) for 3, 5, and 7 days.

[0093] S0802: After the reaction is completed, take out the plastic non-woven fabric, wash it with water and dry it for storage.

[0094] The storage stability test method of hypochlorous acid is as follows:

[0095] S0803: The modified fiber (PET) was sealed in a glass bottle (100 mL) equipped with a PP cap, and a 20-fold weight hypochlorous acid aqueous solution was added and a heat aging test was carried out at 54°C for 14 days.

[0096] S0804: After 14 days of storage, measure pH and FAC content.

[0097] The results are shown in Table 9. After the data are combined, the results show that the room temperature modification treatment improves the hypochlorous acid compatibility of the non-woven fabric, but it does not improve to the same effect as the non-woven fabric modified by heating. Therefore, the modification treatment at 54°C is still preferred.

[0098] Table 9 Results of heating test on the stability of nonwoven fabrics to hypochlorous acid under different modification conditions

[0099]

[0100] Example 8

[0101] Optimize the modification time of non-woven fabric (PET) at 70℃. The steps are as follows:

[0102] S0901: Place the plastic nonwoven in a glass bottle, add 80 times the weight of hypochlorous acid aqueous solution (pH: 6.5, FAC: 200 ppm), heat to 70°C and react.

[0103] S0902: After 0, 2, 4, 8, 16 and 24 hours of reaction, the plastic non-woven fabric is taken out, washed with water, dried and stored.

[0104] The storage stability test method of hypochlorous acid is as follows:

[0105] S0903: The modified nonwoven fabric (PET) was sealed in a glass bottle (100 mL) equipped with a PP cap, and 20 times the weight of hypochlorous acid aqueous solution (pH: 6.45, FAC: 221 ppm) was added and a heat aging test was carried out at 54°C for 14 days.

[0106] S0904: After 14 days of storage, measure pH and FAC content.

[0107] The results are shown in Table 10 and Figure 2 As shown, within 24 hours of modification treatment, the increase in modification treatment time will increase the stability of the non-woven fabric to hypochlorous acid. When the modification treatment is performed at 70°C for more than two hours, the stability of the non-woven fabric to hypochlorous acid has been significantly improved.

[0108] Table 10 Heating test results of nonwoven fabrics with different modification treatment times at 70℃ for hypochlorous acid stability

[0109]

[0110] Example 9

[0111] The experimental steps for room temperature storage of modified nonwoven fabrics and unmodified nonwoven fabrics are as follows:

[0112] S1001: Place a plastic nonwoven in a glass bottle, add 80 times the weight of a hypochlorous acid aqueous solution (pH: 6.5, FAC: 200 ppm), heat to 54° C. and react.

[0113] S1002: After reacting for 1 day, the modified plastic non-woven fabric is taken out, washed with water, and dried for storage.

[0114] The storage stability test method of hypochlorous acid is as follows:

[0115] S1003: Add 15 times the weight of hypochlorous acid aqueous solution to the modified non-woven fabric and the unmodified non-woven fabric and perform a storage test at room temperature 25°C. Measure the pH value and FAC content every month after preparation to compare the difference between the modified non-woven fabric and the unmodified non-woven fabric stored at room temperature.

[0116] The results are shown in Table 11 and Figure 3 As shown, Figure 3 The middle circle represents the modified nonwoven fabric, and the square represents the unmodified nonwoven fabric. The results show that the modified nonwoven fabric has better hypochlorous acid storage stability and better pH stability. There is a significant difference in the third month at room temperature. The storage stability of the modified nonwoven fabric to hypochlorous acid is improved by 180% compared with the unmodified nonwoven fabric.

[0117] Table 11 Room temperature storage test results of modified nonwoven fabrics and unmodified nonwoven fabrics

[0118]

[0119] The above is the test result of the present invention. The present invention provides a modification method for fibers. The modified fibers are characterized by having higher hypochlorous acid storage stability and better sterilization and cleaning effects after long-term storage. The present invention overcomes the previous problem of the difficulty in preserving hypochlorous acid fibers and increases the application of hypochlorous acid fiber manufacturing, transportation, and sales.

[0120] The above is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention; if the present invention is modified or replaced by equivalents without departing from the spirit and scope of the present invention, it should be included in the scope of protection of the patent application of the present invention.

Claims

1. A fiber modification method, characterized in that: The steps include: The fiber is reacted with an oxidant to form an antioxidant fiber, wherein the oxidant is a hypochlorous acid-type oxidant, the temperature of the fiber and the oxidant reaction is 50-80° C., and the reaction time is 2-168 hours; separating antioxidant fibers from the oxidant; and drying the oxidation resistant fiber to form a modified fiber; The fiber is polyethylene terephthalate (PET for short).

2. The fiber modification method according to claim 1, characterized in that: The concentration of the oxidant is 150-20000 ppm.

3. The fiber modification method according to claim 1, characterized in that: The concentration of the oxidant is 150-250 ppm.

4. The fiber modification method according to claim 1, characterized in that: The oxidant is one of sodium hypochlorite, calcium hypochlorite, magnesium hypochlorite, potassium hypochlorite, or hypochlorous acid, or a combination of two or more thereof.

5. The fiber modification method according to claim 1, characterized in that: The fiber is reacted with the oxidant for 24-168 hours.

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