A method for preparing antibacterial and biodegradable wet toilet paper

Abstract

This invention relates to the field of daily necessities technology and discloses a method for preparing antibacterial and biodegradable wet toilet paper. The invention uses rose hydrosol as the aqueous phase, which does not contain irritating ethanol, and various essential oils as the oil phase. A surfactant is used to uniformly disperse the oil phase in the aqueous phase to form a stable wetting liquid. Modified polylactic acid, wood pulp, bamboo pulp, etc., are used as raw materials to prepare a wet toilet paper base paper. The wetting liquid is then uniformly sprayed onto the base paper to obtain wet toilet paper. The wet toilet paper prepared by this invention has long-lasting antibacterial properties, excellent mechanical properties, and comfortable performance.

Description

Technical Field

[0001] This invention relates to the field of daily necessities technology, specifically to a method for preparing antibacterial and biodegradable wet toilet paper. Background Technology

[0002] With rising living standards and improved hygiene awareness, wet toilet paper is gradually becoming a new standard in personal care due to its superior cleaning ability and comfortable use. Most wet toilet paper on the market uses petroleum-based nonwoven fabrics such as polypropylene (PP) and polyester (PET) as a carrier. These materials are chemically stable, difficult to degrade in the natural environment, and can form microplastics that cause persistent pollution to water and soil, contradicting the global trend of sustainable development.

[0003] Traditional product formulations often focus solely on basic cleaning capabilities, neglecting the overall optimization of the user experience. For example, the addition of alcohol or strong preservatives to maintain shelf life may cause dry and stinging skin; to enhance antibacterial properties, ingredients such as triclosan and quaternary ammonium salts are used. While these ingredients have a broad antibacterial spectrum and fast-acting effects, they pose potential risks of skin irritation and sensitization. Long-term use may disrupt the delicate microecological balance of the intimate area. Furthermore, the antibacterial effect of a single chemical ingredient is limited and lacks soothing properties, failing to meet users' advanced needs for integrated "cleaning, care, and comfort."

[0004] In addition, the "wet" nature of wet toilet paper, while bringing a refreshing and clean feeling, also creates a potentially damp environment. If it lacks long-lasting antibacterial ability, this damp environment may become a breeding ground for bacteria. When wet wipes contaminated with bacteria come into contact with skin folds, they may not be able to effectively inhibit bacteria, and may even make bacteria more likely to remain and multiply on the skin due to the dampness. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a method for preparing antibacterial and biodegradable wet toilet paper. The prepared toilet paper exhibits excellent long-lasting antibacterial properties, mechanical properties, and comfort.

[0007] (II) Technical Solution

[0008] A method for preparing antibacterial and biodegradable wet toilet paper, the method comprising the following steps:

[0009] (1) Preparation method of wet toilet paper base paper

[0010] Wood pulp, bamboo pulp, modified polylactic acid fiber, and epoxy resin are stirred and mixed evenly, then dehydrated and dried using a paper machine to obtain wet toilet paper base paper.

[0011] Polylactic acid fiber is a polyester fiber made from lactic acid produced by fermenting starch from renewable sources such as corn and cassava. It is polymerized and spun into fibers. It has good biocompatibility, and its degradation products are carbon dioxide and water, which do not pollute the environment and have no toxic side effects on organisms.

[0012] In this preparation process, wood pulp and bamboo pulp serve as the basic framework of the paper, providing essential softness, absorbency, and mechanical strength. Both are biodegradable natural cellulose fibers. Modified polylactic acid fiber is a key component for its biodegradability and long-lasting antibacterial properties. Epoxy resin is a key component for maintaining "wet strength." In a hydrated state, the hydrogen bonds between cellulose fibers are broken, leading to a sharp decrease in paper strength. As a wet strength agent, epoxy resin can form a strong chemical cross-linking network between fibers, locking in the fibers and ensuring that the paper remains tough and resistant to tearing when wet. Without it, wet toilet paper disintegrates upon contact with water, cannot be effectively wiped, and completely loses its usability.

[0013] (2) Preparation method of wetting liquid

[0014] Calendula essential oil, lavender essential oil, tea tree essential oil, myrrh essential oil, nano titanium dioxide, and aloe vera essential oil are added to purified water containing rose hydrosol, stirred and dispersed, and then sucrose ester is added and stirred and mixed evenly to obtain a uniform, non-layered liquid, which is the wetting solution.

[0015] Compared to wet toilet paper containing ethanol, preservatives, or synthetic fragrances, rose hydrosol-infused wet toilet paper is extremely gentle, making it ideal for sensitive skin and delicate skin in intimate areas. It significantly reduces the risk of allergies or irritation. In addition, rose hydrosol helps maintain the skin's normal pH level (slightly acidic) and forms a very thin moisturizing film, which helps protect the skin's natural barrier and prevents dryness and minor damage caused by repeated wiping.

[0016] When hemorrhoids flare up and cause swelling and pain, or skin redness and irritation due to excessive rubbing, or mild eczema or dermatitis, the triterpenoids and flavonoids in calendula essential oil can effectively inhibit the inflammatory response and quickly relieve discomfort. In addition, calendula has an inhibitory effect on Staphylococcus aureus and Candida albicans, providing additional, natural hygiene protection and helping to prevent minor infections and maintain skin health.

[0017] Nano-titanium dioxide is an enhancing component of "physical photocatalytic antibacterial". Under the action of light, it can generate reactive oxygen species, decompose organic pollutants and bacterial cell membranes, and provide a non-soluble and long-lasting physical antibacterial effect. It is different from the chemical antibacterial pathway of essential oils, forming a dual chemical-physical antibacterial protection mechanism, which is especially effective against certain drug-resistant bacteria.

[0018] In this preparation process, rose hydrosol is the aqueous phase base and various essential oils are the oil phase. However, the compatibility between the oil phase and the aqueous phase is poor. Therefore, sucrose ester is used as a safe and biodegradable nonionic surfactant, which can form a thin film at the interface between oil and water, encapsulate the oil droplets, emulsify the oil phase substances into tiny droplets, and stably disperse them in the aqueous phase to obtain a stable wetting liquid.

[0019] (3) Spray the wetting liquid evenly onto the cut dry toilet paper base paper to obtain antibacterial and biodegradable toilet paper.

[0020] Preferably, the weight ratio of wood pulp, bamboo pulp, modified polylactic acid fiber, and epoxy resin is 100:80-120:20-50:10-20.

[0021] Preferably, the modified polylactic acid fiber is prepared by:

[0022] Clean polylactic acid fibers were soaked in a hexamethylenediamine isopropanol solution and reacted at 35°C for 10-20 min. After the reaction, the fibers were washed with isopropanol and deionized water in sequence. Then, the fibers were added to a cinnamaldehyde ethanol solution and reacted at 40°C for 6-10 h. After the reaction, the fibers were filtered, washed with ethanol and deionized water in sequence, and dried to obtain modified polylactic acid.

[0023] In this reaction, firstly, the carboxyl groups in polylactic acid undergo an amidation reaction with the amino groups in hexamethylenediamine. Then, the remaining amino groups undergo a Schiff base reaction with the aldehyde groups in cinnamaldehyde. That is, using an antibacterial Schiff base as a bridge, the volatile cinnamaldehyde is stabilized in the polylactic acid structure, reducing the volatility of cinnamaldehyde and improving its long-lasting antibacterial effect. Secondly, the modified polylactic acid fiber contains more branched structures. The branched structures can not only interweave with each other to form more cross-linking sites, but the branches can also cross-link with the molecular chains of wood pulp, bamboo pulp, and epoxy resin, generating more cross-linking sites, thereby improving the mechanical properties of the base paper.

[0024] Preferably, the concentration of the hexamethylenediamine isopropanol solution is 0.02 g / mL; and the concentration of cinnamaldehyde ethanol is 0.1-0.2 g / mL.

[0025] Preferably, the method for preparing the rose hydrosol is as follows:

[0026] Rose petals were placed in a distillation tank, purified water was added at a ratio of 1:4, the mixture was heated, and after boiling, it was refluxed for 5 hours. The distillate was collected, and the upper essential oil was removed using a pipette to obtain rose hydrosol.

[0027] Preferably, the weight ratio of calendula essential oil, lavender essential oil, tea tree essential oil, myrrh essential oil, nano titanium dioxide, aloe vera essential oil, rose hydrosol, deionized water, and sucrose ester is 10-15:3-8:5-10:2-5:3-6:2-5:20-30:100:2-4.

[0028] (iii) Beneficial technical effects

[0029] This invention prepares an antibacterial and biodegradable wet toilet paper, in which essential oils are dispersed in rose hydrosol in the form of small molecules to obtain a wetting liquid. During use, the core component of tea tree essential oil, "terpinene-4-ol," can rapidly destroy the cell membranes of pathogens, and has a direct and efficient killing effect on common bacteria (such as Staphylococcus aureus) and fungi (such as Candida albicans) that cause odor and infection. Nano-titanium dioxide can generate reactive oxygen under light, decomposing organic pollutants and bacterial cell membranes, providing a non-dissolving and long-lasting physical antibacterial effect. The two form a chemical-physical dual antibacterial protection mechanism. After using the toilet, minor skin abrasions, redness, and folliculitis may occur due to friction or existing problems. Myrrh essential oil and calendula essential oil can directly act on inflammatory factors, quickly calming and accelerating tissue regeneration and healing. Tea tree essential oil and myrrh essential oil have strong effects and may have potential irritation to some people. This invention uses lavender essential oil, whose mild and soothing properties can effectively neutralize this irritation, making the entire formula safer and more skin-friendly. Repeated wiping with toilet paper removes sebum, leading to dry skin. This invention utilizes the polysaccharides abundant in aloe vera essential oil to provide instant hydration and moisturization, forming a protective film on the skin surface to reduce subsequent friction while promoting the absorption and repair of other active ingredients. Healthy skin has a slightly acidic pH, and rose hydrosol is naturally slightly acidic, helping to maintain a healthy pH environment in the intimate area and inhibiting the growth of harmful bacteria at its source—a function that ordinary purified water and ethanol completely lack. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1

[0032] (1) Clean polylactic acid fiber was soaked in a hexamethylenediamine isopropanol solution with a concentration of 0.02 g / mL and reacted at 35°C for 10 min. After the reaction was completed, it was washed with isopropanol and deionized water in sequence. Then it was added to a cinnamaldehyde ethanol solution with a concentration of 0.2 g / mL and reacted at 40°C for 7 h. After the reaction was completed, it was filtered and washed with ethanol and deionized water in sequence. After drying, modified polylactic acid was obtained.

[0033] (2) Mix 100 parts by weight of wood pulp, 100 parts by weight of bamboo pulp, 20 parts by weight of modified polylactic acid fiber and 12 parts by weight of epoxy resin evenly, dehydrate and dry them through a paper machine to obtain wet toilet paper base paper.

[0034] (3) Place the rose petals in a distillation extraction tank, add purified water at a ratio of 1:4, heat, reflux for 5 hours after boiling, collect the distillate, and use a pipette to remove the upper essential oil to obtain rose hydrosol.

[0035] (4) According to the weight parts, add 10 parts of calendula essential oil, 3 parts of lavender essential oil, 8 parts of tea tree essential oil, 4 parts of myrrh essential oil, 4 parts of nano titanium dioxide, and 2 parts of aloe vera essential oil to a mixed solution of 20 parts of rose hydrosol and 100 parts of purified water, stir and disperse, then add 3 parts of sucrose ester, stir and mix evenly to obtain a uniform, non-layered liquid, which is the wetting liquid.

[0036] (5) Spray the wetting liquid evenly onto the cut dry toilet paper base paper to obtain antibacterial and biodegradable toilet paper.

[0037] Example 2

[0038] (1) Clean polylactic acid fiber was soaked in a hexamethylenediamine isopropanol solution with a concentration of 0.02 g / mL and reacted at 35 °C for 15 min. After the reaction was completed, it was washed with isopropanol and deionized water in sequence. Then it was added to a 0.1 g / mL cinnamaldehyde ethanol solution and reacted at 40 °C for 10 h. After the reaction was completed, it was filtered and washed with ethanol and deionized water in sequence. After drying, modified polylactic acid was obtained.

[0039] (2) Mix 100 parts by weight of wood pulp, 100 parts by weight of bamboo pulp, 25 parts by weight of modified polylactic acid fiber and 18 parts by weight of epoxy resin evenly, dehydrate and dry them through a paper machine to obtain wet toilet paper base paper.

[0040] (3) Place the rose petals in a distillation extraction tank, add purified water at a ratio of 1:4, heat, reflux for 5 hours after boiling, collect the distillate, and use a pipette to remove the upper essential oil to obtain rose hydrosol.

[0041] (4) According to the weight parts, add 12 parts of calendula essential oil, 5 parts of lavender essential oil, 5 parts of tea tree essential oil, 2 parts of myrrh essential oil, 3 parts of nano titanium dioxide, and 4 parts of aloe vera essential oil to a mixed solution of 30 parts of rose hydrosol and 100 parts of purified water, stir and disperse, then add 4 parts of sucrose ester, stir and mix evenly to obtain a uniform, non-layered liquid, which is the wetting liquid.

[0042] (5) Spray the wetting liquid evenly onto the cut dry toilet paper base paper to obtain antibacterial and biodegradable toilet paper.

[0043] Example 3

[0044] (1) Clean polylactic acid fiber was soaked in a hexamethylenediamine isopropanol solution with a concentration of 0.02 g / mL and reacted at 35 °C for 20 min. After the reaction was completed, it was washed with isopropanol and deionized water in sequence. Then it was added to a cinnamaldehyde ethanol solution with a concentration of 0.15 g / mL and reacted at 40 °C for 10 h. After the reaction was completed, it was filtered and washed with ethanol and deionized water in sequence. After drying, modified polylactic acid was obtained.

[0045] (2) Mix 100 parts by weight of wood pulp, 120 parts by weight of bamboo pulp, 30 parts by weight of modified polylactic acid fiber and 15 parts by weight of epoxy resin evenly, dehydrate and dry them through a paper machine to obtain wet toilet paper base paper.

[0046] (3) Place the rose petals in a distillation extraction tank, add purified water at a ratio of 1:4, heat, reflux for 5 hours after boiling, collect the distillate, and use a pipette to remove the upper essential oil to obtain rose hydrosol.

[0047] (4) According to the weight parts, add 15 parts of calendula essential oil, 8 parts of lavender essential oil, 10 parts of tea tree essential oil, 5 parts of myrrh essential oil, 6 parts of nano titanium dioxide, and 5 parts of aloe vera essential oil to a mixed solution of 25 parts of rose hydrosol and 100 parts of purified water, stir and disperse, then add 2 parts of sucrose ester, stir and mix evenly to obtain a uniform, non-layered liquid, which is the wetting liquid.

[0048] (5) Spray the wetting liquid evenly onto the cut dry toilet paper base paper to obtain antibacterial and biodegradable toilet paper.

[0049] Example 4

[0050] (1) Clean polylactic acid fiber was soaked in a hexamethylenediamine isopropanol solution with a concentration of 0.02 g / mL and reacted at 35 °C for 15 min. After the reaction was completed, it was washed with isopropanol and deionized water in sequence. Then it was added to a cinnamaldehyde ethanol solution with a concentration of 0.15 g / mL and reacted at 40 °C for 8 h. After the reaction was completed, it was filtered and washed with ethanol and deionized water in sequence. After drying, modified polylactic acid was obtained.

[0051] (2) Mix 100 parts by weight of wood pulp, 100 parts by weight of bamboo pulp, 40 parts by weight of modified polylactic acid fiber and 10 parts by weight of epoxy resin evenly, dehydrate and dry them through a paper machine to obtain wet toilet paper base paper.

[0052] (3) Place the rose petals in a distillation extraction tank, add purified water at a ratio of 1:4, heat, reflux for 5 hours after boiling, collect the distillate, and use a pipette to remove the upper essential oil to obtain rose hydrosol.

[0053] (4) According to the weight parts, add 13 parts of calendula essential oil, 6 parts of lavender essential oil, 10 parts of tea tree essential oil, 4 parts of myrrh essential oil, 4 parts of nano titanium dioxide, and 5 parts of aloe vera essential oil to a mixed solution of 25 parts of rose hydrosol and 100 parts of purified water, stir and disperse, then add 4 parts of sucrose ester, stir and mix evenly to obtain a uniform, non-layered liquid, which is the wetting liquid.

[0054] (5) Spray the wetting liquid evenly onto the cut dry toilet paper base paper to obtain antibacterial and biodegradable toilet paper.

[0055] Example 5

[0056] (1) Clean polylactic acid fiber was soaked in a hexamethylenediamine isopropanol solution with a concentration of 0.02 g / mL and reacted at 35 °C for 10 min. After the reaction was completed, it was washed with isopropanol and deionized water in sequence. Then it was added to a cinnamaldehyde ethanol solution with a concentration of 0.1 g / mL and reacted at 40 °C for 8 h. After the reaction was completed, it was filtered and washed with ethanol and deionized water in sequence. After drying, modified polylactic acid was obtained.

[0057] (2) Mix 100 parts by weight of wood pulp, 80 parts by weight of bamboo pulp, 50 parts by weight of modified polylactic acid fiber and 20 parts by weight of epoxy resin evenly, dehydrate and dry them through a paper machine to obtain wet toilet paper base paper.

[0058] (3) Place the rose petals in a distillation extraction tank, add purified water at a ratio of 1:4, heat, reflux for 5 hours after boiling, collect the distillate, and use a pipette to remove the upper essential oil to obtain rose hydrosol.

[0059] (4) According to the weight parts, add 15 parts of calendula essential oil, 6 parts of lavender essential oil, 8 parts of tea tree essential oil, 5 parts of myrrh essential oil, 3 parts of nano titanium dioxide, and 4 parts of aloe vera essential oil to a mixed solution of 23 parts of rose hydrosol and 100 parts of purified water, stir and disperse, then add 4 parts of sucrose ester, stir and mix evenly to obtain a uniform, non-layered liquid, which is the wetting liquid.

[0060] (5) Spray the wetting liquid evenly onto the cut dry toilet paper base paper to obtain antibacterial and biodegradable toilet paper.

[0061] Comparative Example 1

[0062] The difference between this comparative example and Example 1 is that polylactic acid fiber is used instead of modified polylactic acid fiber in step (2).

[0063] Comparative Example 2

[0064] The difference between this comparative example and Example 1 is that in step (4), ethanol is used instead of rose hydrosol.

[0065] Comparative Example 3

[0066] The difference between this comparative example and Example 1 is that step (4) does not contain tea tree oil.

[0067] Comparative Example 4

[0068] The difference between this comparative example and Example 1 is that step (4) does not contain nano-titanium dioxide.

[0069] Antimicrobial tests were conducted in accordance with GB / T20944.3-2008, and the tested bacteria were Staphylococcus aureus, Escherichia coli, and Candida albicans.

[0070] Table 1:

[0071]

[0072] Table 2:

[0073]

[0074] As shown in Tables 1 and 2, the wet toilet paper prepared by this invention exhibits excellent antibacterial properties and long-lasting antibacterial performance. In Comparative Example 1, conventional polylactic acid was used instead of modified polylactic acid. Modified polylactic acid contains antibacterial cinnamaldehyde and Schiff base structures, while Comparative Example 1 does not contain these antibacterial structures; therefore, its antibacterial performance is poor. In Comparative Example 2, ethanol was used instead of rose hydrosol. Ethanol is more volatile, therefore, its long-lasting antibacterial performance is poor. As can be seen from Comparative Examples 3-4 and the examples, the physical-chemical antibacterial structure formed by tea tree oil and nano-titanium dioxide exhibits superior antibacterial properties and long-lasting antibacterial performance.

[0075] Referring to the national standard GB / T24218.3-2010, the longitudinal and transverse tensile forces under wet conditions were tested. The mechanical properties were tested using an electronic tensile testing machine, with a tensile rate of 250 mm / min.

[0076] According to the national standard GB / T40181-2021, the test dispersion performance was obtained by testing in a shaking chamber for 2 minutes.

[0077] Table 3:

[0078]

[0079] As shown in Table 3, the wet toilet paper prepared by the present invention has excellent mechanical properties. The difference between Comparative Example 1 and the Example is that the polylactic acid was not modified. The modified polylactic acid prepared by the present invention can improve the mechanical properties of the wet toilet paper through the cross-linked network structure formed by the interweaving of the side chains and the main chain. However, Comparative Example 1 was not modified, so its mechanical properties are poor.

[0080] Twenty researchers without any diseases were selected to use the wet toilet paper of this invention to evaluate its comfort. The evaluation dimensions included fragrance, irritation, stain removal ability, and freshness. The evaluation level was 0-10, with 0 being the worst and 10 being the best.

[0081] Table 4:

[0082]

[0083] As shown in Table 4, the wet toilet paper with ethanol as the aqueous phase has a low rating. This is because ethanol is more irritating to the human body than rose hydrosol, hence its lower rating.

[0084] In summary, the wet toilet paper prepared by this invention has good long-lasting antibacterial properties, mechanical properties, and comfort.

[0085] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing antibacterial and biodegradable wet toilet paper, characterized in that, The preparation method includes the following steps: (1) Preparation method of wet toilet paper base paper Wood pulp, bamboo pulp, modified polylactic acid fiber, and epoxy resin are stirred and mixed evenly, then dehydrated and dried in a papermaking machine to obtain wet toilet paper base paper. (2) Preparation method of wetting liquid Calendula essential oil, lavender essential oil, tea tree essential oil, myrrh essential oil, nano titanium dioxide, and aloe vera essential oil are added to purified water containing rose hydrosol, stirred and dispersed, and then sucrose ester is added and stirred and mixed evenly to obtain a uniform, non-layered liquid, which is the wetting solution. (3) Spray the wetting liquid evenly onto the cut dry toilet paper base paper to obtain antibacterial and biodegradable toilet paper; The method for preparing the modified polylactic acid fiber is as follows: Clean polylactic acid fibers were soaked in a hexamethylenediamine isopropanol solution and reacted at 35°C for 10-20 minutes. After the reaction, the fibers were washed with isopropanol and deionized water in sequence. Then, the fibers were added to a cinnamaldehyde ethanol solution and reacted at 40°C for 6-10 hours. After the reaction, the fibers were filtered, washed with ethanol and deionized water in sequence, and dried to obtain modified polylactic acid fibers.

2. The method for preparing antibacterial and biodegradable wet toilet paper according to claim 1, characterized in that, The weight ratio of wood pulp, bamboo pulp, modified polylactic acid fiber, and epoxy resin is 100:80-120:20-50:10-20.

3. The method for preparing antibacterial and biodegradable wet toilet paper according to claim 1, characterized in that, The weight ratio of the calendula essential oil, lavender essential oil, tea tree essential oil, myrrh essential oil, nano titanium dioxide, aloe vera essential oil, rose hydrosol, deionized water, and sucrose ester is 10-15:3-8:5-10:2-5:3-6:2-5:20-30:100:2-4.

4. The method for preparing antibacterial and biodegradable wet toilet paper according to claim 1, characterized in that, The concentration of the hexamethylenediamine isopropanol solution is 0.02 g / mL.

5. The method for preparing antibacterial and biodegradable wet toilet paper according to claim 1, characterized in that, The concentration of cinnamaldehyde ethanol is 0.1-0.2 g / mL.

6. The method for preparing antibacterial and biodegradable wet toilet paper according to claim 1, characterized in that, The method for preparing the rose hydrosol is as follows: Rose petals were placed in a distillation tank, purified water was added at a ratio of 1:4, the mixture was heated, and after boiling, it was refluxed for 5 hours. The distillate was collected, and the upper essential oil was removed using a pipette to obtain rose hydrosol.

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