Preparation method of degradable polylactic acid wet tissue

Abstract

The invention provides a preparation method of a degradable polylactic acid wet tissue, and relates to the technical field of preparation of wet tissues. The degradable polylactic acid wet tissue is prepared by guiding the wet tissue immersion liquid into an automatic wet tissue machine and spraying the wet tissue immersion liquid on the degradable composite non-woven fabric; the sulfydryl (-SH) in the ficin protease disclosed by the invention has nucleophilicity and can attack an olefin part (C = C double bond) in zinc sorbate and beta-digalactosyl-A '-linolenyl glyceride; the reaction is carried out through a Michael addition mechanism, sulfydryl is added to a C = C double bond, and a stable thioethane derivative is formed; a new compound formed through addition reaction can effectively remove facial grease and dirt, meanwhile, a natural protection layer of skin is kept, and dryness and irritation caused by excessive cleaning are avoided; the degradable polylactic acid wet tissue prepared by the preparation method disclosed by the invention has relatively high degradability and sterilization rate.

Description

Technical Field

[0001] The invention relates to the technical field of wet wipe preparation, in particular to a method for preparing degradable polylactic acid wet wipes. Background Art

[0002] Biodegradable wet wipes are wet wipes that, under certain conditions, can naturally degrade and break down into harmless substances in a relatively short period of time. Compared with traditional wet wipes, biodegradable wet wipes are more environmentally friendly and sustainable, making them a relatively environmentally friendly product.

[0003] Chinese patent CN114404304A: relates to a degradable disinfectant wet skin care wipe, comprising a wet wipe soak and a degradable composite non-woven fabric as a carrier of the wet wipe soak. The composite non-woven fabric is a sandwich structure, which consists of a modified polylactic acid fiber layer, a lyocell fiber and wood pulp fiber composite layer, and a modified polylactic acid fiber layer. The modified polylactic acid is obtained by melt co-extrusion of polylactic acid modified by grafting quaternary ammonium salt and maleic anhydride and a side chain hydroxyl-containing polymer.

[0004] Chinese patent CN111110613A: belongs to the field of wet wipe processing and preparation technology, specifically a degradable disinfectant wet wipe and a preparation method thereof, the method comprising the following preparation steps: S1: weighing a crushed sample of golden thread grass, decocting it with 7-8 times the amount of water for 3 hours, filtering, concentrating under reduced pressure to a relative density of 1.15-1.2 at room temperature, and extracting with ethyl acetate to obtain a golden thread grass extract; S2: adding deionized water, a surfactant, disodium ethylenediaminetetraacetic acid, a synergist, and aloe vera extract into a vertical mixing tank, stirring until completely dissolved, and then fully mixing benzalkonium chloride with alkyl side chains of C12, C14, and C18 respectively.

[0005] Chinese Patent CN101745137A provides a biodegradable disinfectant wet wipe, specifically a highly effective, stable, non-toxic, biodegradable, and environmentally friendly disinfectant wet wipe containing chlorine dioxide as its primary active ingredient. The disinfectant wet wipe comprises a wet wipe carrier made of a biodegradable nonwoven fabric, which contains a chlorine dioxide precursor or chlorine dioxide solution, an organic acid or an inorganic acid, and a pH buffer system. The invention also provides a preparation method and application of the disinfectant wet wipe.

[0006] The base fabric of the wet wipes prepared by the above patents and prior art mainly adopts non-woven fabrics blended with viscose fibers and polyester fibers. The polyester fibers are buried in the soil and cannot be degraded over a long period of time, which will cause pollution and damage to the soil environment. Summary of the Invention

[0007] In order to solve the above problems, the present invention provides a method for preparing degradable polylactic acid wet wipes, which includes a wet wipes soak and a degradable composite non-woven fabric. The operating steps are: introducing the wet wipes soak into an automatic wet wipe machine and spraying it on the degradable composite non-woven fabric; wherein the spraying amount of the degradable composite non-woven fabric is controlled to spray 2-6 mL of the wet wipes soak per gram of wet wipes.

[0008] In some embodiments, the degradable composite non-woven fabric structure is obtained by laying 10-20 parts of polylactic acid fiber layer, 20-30 parts of lyocell fiber and natural cellulose composite layer, and 10-20 parts of polylactic acid fiber layer in order, and then hydroentangled; wherein the mass ratio of lyocell fiber to natural cellulose in the lyocell fiber and natural cellulose composite layer is 1:1-3.

[0009] In some embodiments, the polylactic acid is one of poly D-lactic acid, poly L-lactic acid, and poly DL-lactic acid.

[0010] In some embodiments, the natural cellulose is one of bamboo fiber, wood fiber, hemp fiber, and cotton fiber.

[0011] In some embodiments, the preparation method of the wet wipes extract is:

[0012] Stir and mix 0.01-0.1 parts of fungicide, 1-5 parts of moisturizer, 1-5 parts of surfactant, 0.01-0.1 parts of chelating agent, 0.01-0.1 parts of synergist and 60-80 parts of deionized water until uniform.

[0013] In some embodiments, the bactericide is one of chlorine dioxide or benzalkonium chloride.

[0014] In some embodiments, the moisturizing agent is one of propylene glycol, glycerin, butylene glycol, sorbitol, and hyaluronic acid.

[0015] In some embodiments, the surfactant is one of sodium dodecylbenzenesulfonate, palmitic acid, sodium myristate, and decyl glucoside.

[0016] In some embodiments, the chelating agent is one of tetrasodium glutamate dicaprylate and disodium edetate.

[0017] In some embodiments, the preparation method of the synergist is:

[0018] In a stirred reactor, 10-20 parts of ficin, 2-5 parts of zinc sorbate, 0.004-0.04 parts of β-digalactosyl-A'-linolenoyl glyceride, 0.5-2 parts of baking soda, and 200-240 parts of ethanol were added by weight. The mixture was stirred at 60-70° C. for 50-80 minutes, and the ethanol was removed by distillation under reduced pressure to obtain a synergist.

[0019] Reaction mechanism

[0020] 1. Mercapto-olefin addition reaction:

[0021] The sulfhydryl group (-SH) in ficin is nucleophilic and can attack the olefin moiety (C=C double bond) in zinc sorbate and β-digalactosyl-A'-linolenoylglycerol; this reaction proceeds via a Michael addition mechanism, with the sulfhydryl group adding to the C=C double bond to form a stable thioethane derivative.

[0022] 2. Facial cleansing effect:

[0023] The new compound formed through the addition reaction can effectively remove facial oil and dirt while maintaining the skin's natural protective layer to avoid dryness and irritation caused by over-cleansing.

[0024] Technical Effects

[0025] The present invention provides a method for preparing a degradable polylactic acid wet wipe. Compared with the prior art, the present invention has the following significant effects:

[0026] 1. Enhance skin cleansing ability: The generated thioethane derivatives show excellent cleansing ability in cleansers, especially in removing sebum and urban pollution.

[0027] 2. Improve ingredient stability: The product after the thiol-olefin addition reaction is more stable than the original ingredient and is not easy to decompose during storage, thus extending the shelf life of the product.

[0028] 3. Promote skin health: This new compound is mild and non-irritating to the skin, helps maintain the skin's natural pH and microbial balance, and reduces the occurrence of skin problems.

[0029] 4. Improve product sensory experience: The newly synthesized ingredients make the cosmetic wipes smoother when used, improving user experience and increasing product market competitiveness.

[0030] 5. Environmental friendliness: The reaction process avoids the use of traditional organic solvents, reduces environmental pollution during production, and complies with the principles of green chemistry.

[0031] 6. The degradable polylactic acid wet wipes prepared by the present invention can also significantly improve the sterilization rate.

[0032] In summary, through this unique chemical reaction mechanism, not only the cleaning effect and usability of cosmetic wipes are improved, but also the safety and environmental friendliness of the product are ensured, reflecting the technological progress and sustainable development trend of the modern cosmetics industry. DETAILED DESCRIPTION

[0033] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention object, the following is a detailed description in conjunction with examples and comparative examples:

[0034] Test method:

[0035] 1. Degradability test: bury the wipes in soil at a depth of 20 cm under natural conditions at 25±5°C. From the start of the test, add a small amount of water every 10 days to keep the soil moist. Take them out after 60 days and test the degradation rate.

[0036] 2. Antibacterial test: Escherichia coli was used as the test strain and the test was carried out in accordance with the GB15979-2002 method.

[0037] Example 1

[0038] A method for preparing degradable polylactic acid wet wipes includes a wet wipes soak and a degradable composite non-woven fabric. The operating steps are: introducing the wet wipes soak into an automatic wet wipes machine and spraying it on the degradable composite non-woven fabric; wherein the spraying amount of the degradable composite non-woven fabric is controlled to spray 2 mL of the wet wipes soak per gram of wet wipes.

[0039] The degradable composite non-woven fabric structure is obtained by laying a 10g polylactic acid fiber layer, a 20g lyocell fiber and natural cellulose composite layer, and a 10g polylactic acid fiber layer in order, and then hydroentangling reinforcement; wherein the mass ratio of lyocell fiber to natural cellulose in the lyocell fiber and natural cellulose composite layer is 1:1.

[0040] The polylactic acid is poly D-lactic acid.

[0041] The natural cellulose is bamboo fiber.

[0042] The preparation method of the wet wipes immersion liquid is as follows:

[0043] Stir and mix 0.01 g of fungicide, 1 g of moisturizer, 1 g of surfactant, 0.01 g of chelating agent, 0.01 g of synergist, and 60 g of deionized water.

[0044] The bactericide is chlorine dioxide.

[0045] The moisturizing agent is propylene glycol.

[0046] The surfactant is sodium dodecylbenzenesulfonate.

[0047] The chelating agent is tetrasodium glutamate dihexanoate.

[0048] The preparation method of the synergist is:

[0049] 10 g of ficin, 2 g of zinc sorbate, 0.004 g of β-digalactosyl-A'-linolenoyl glyceride, 0.5 g of baking soda, and 200 g of ethanol were added to a stirred reactor, stirred at 60° C. for 50 minutes, and the ethanol was removed by distillation under reduced pressure to obtain a synergist.

[0050] Example 2

[0051] A method for preparing degradable polylactic acid wet wipes includes a wet wipes soak and a degradable composite non-woven fabric. The operating steps are: introducing the wet wipes soak into an automatic wet wipes machine and spraying it on the degradable composite non-woven fabric; wherein the spraying amount of the degradable composite non-woven fabric is controlled to spray 3 mL of the wet wipes soak per gram of wet wipes.

[0052] The degradable composite non-woven fabric structure is obtained by laying a 13g polylactic acid fiber layer, a 23g lyocell fiber and natural cellulose composite layer, and a 13g polylactic acid fiber layer in that order, and then hydroentangling reinforcement; wherein the mass ratio of lyocell fiber to natural cellulose in the lyocell fiber and natural cellulose composite layer is 1:2.

[0053] The polylactic acid is poly-L-lactic acid.

[0054] The natural cellulose is wood fiber.

[0055] The preparation method of the wet wipes immersion liquid is as follows:

[0056] Stir and mix 0.05 g of fungicide, 2 g of moisturizer, 2 g of surfactant, 0.05 g of chelating agent, 0.05 g of synergist, and 65 g of deionized water.

[0057] The bactericide is chlorine dioxide.

[0058] The moisturizing agent is glycerin.

[0059] The surfactant is palmitic acid.

[0060] The chelating agent is tetrasodium glutamate dihexanoate.

[0061] The preparation method of the synergist is:

[0062] 13 g of ficin, 3 g of zinc sorbate, 0.01 g of β-digalactosyl-A'-linolenoyl glyceride, 1 g of baking soda, and 210 g of ethanol were added to a stirred reactor, stirred at 65° C. for 60 minutes, and the ethanol was removed by distillation under reduced pressure to obtain a synergist.

[0063] Example 3

[0064] A method for preparing degradable polylactic acid wet wipes includes a wet wipes soaking liquid and a degradable composite non-woven fabric. The operation steps are: introducing the wet wipes soaking liquid into an automatic wet wipes machine and spraying it on the degradable composite non-woven fabric; wherein the spraying amount of the degradable composite non-woven fabric is controlled to spray 5 mL of the wet wipes soaking liquid per gram of wet wipes.

[0065] The degradable composite non-woven fabric structure is obtained by laying an 18g polylactic acid fiber layer, a 28g lyocell fiber and natural cellulose composite layer, and an 18g polylactic acid fiber layer in that order, and then hydroentangling reinforcement; wherein the mass ratio of lyocell fiber to natural cellulose in the lyocell fiber and natural cellulose composite layer is 1:2.

[0066] The polylactic acid is poly-L-lactic acid.

[0067] The natural cellulose is hemp fiber.

[0068] The preparation method of the wet wipes immersion liquid is as follows:

[0069] Stir and mix 0.08 g of fungicide, 4 g of moisturizer, 4 g of surfactant, 0.08 g of chelating agent, 0.08 g of synergist, and 75 g of deionized water.

[0070] The bactericide is benzalkonium chloride.

[0071] The moisturizing agent is sorbitol.

[0072] The surfactant is sodium myristate.

[0073] The chelating agent is disodium edetate.

[0074] The preparation method of the synergist is:

[0075] 18 g of ficin, 4 g of zinc sorbate, 0.03 g of β-digalactosyl-A'-linolenoyl glyceride, 1.5 g of baking soda, and 230 g of ethanol were added to a stirred reactor, stirred at 65° C. for 70 minutes, and the ethanol was removed by distillation under reduced pressure to obtain a synergist.

[0076] Example 4

[0077] A method for preparing degradable polylactic acid wet wipes includes a wet wipes soak and a degradable composite non-woven fabric. The operating steps are: introducing the wet wipes soak into an automatic wet wipes machine and spraying it on the degradable composite non-woven fabric; wherein the spraying amount of the degradable composite non-woven fabric is controlled to spray 6 mL of the wet wipes soak per gram of wet wipes.

[0078] The degradable composite non-woven fabric structure is obtained by laying a 20g polylactic acid fiber layer, a 30g lyocell fiber and natural cellulose composite layer, and a 20g polylactic acid fiber layer in that order, and then hydroentangling reinforcement; wherein the mass ratio of lyocell fiber to natural cellulose in the lyocell fiber and natural cellulose composite layer is 1:3.

[0079] The polylactic acid is poly DL-lactic acid.

[0080] The natural cellulose is cotton fiber.

[0081] The preparation method of the wet wipes immersion liquid is as follows:

[0082] Stir and mix 0.1 g of fungicide, 5 g of moisturizer, 5 g of surfactant, 0.1 g of chelating agent, 0.1 g of synergist, and 80 g of deionized water.

[0083] The bactericide is benzalkonium chloride.

[0084] The moisturizing agent is hyaluronic acid.

[0085] The surfactant is decyl glucoside.

[0086] The chelating agent is disodium edetate.

[0087] The preparation method of the synergist is:

[0088] 20 g of ficin, 5 g of zinc sorbate, 0.04 g of β-digalactosyl-A'-linolenoyl glyceride, 2 g of baking soda, and 240 g of ethanol were added to a stirred reactor, stirred at 70° C. for 80 minutes, and the ethanol was removed by distillation under reduced pressure to obtain a synergist.

[0089] Comparative Example 1

[0090] The preparation process of the wet wipes extract in this example is the same as that in Example 1 except that no synergist is added.

[0091] Comparative Example 2

[0092] The preparation process of the synergist in this example is the same as that in Example 1 except that ficin is not added.

[0093] Comparative Example 3

[0094] The preparation process of the synergist in this example is the same as that in Example 1 except that β-digalactosyl-A'-linolenoyl glyceride is not added.

[0095] Test results:

[0096]

[0097]

[0098] Through the data analysis of the above examples and comparative examples, the degradable polylactic acid wet wipes prepared by the present invention have high degradability and sterilization rate.

[0099] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for preparing degradable polylactic acid wet wipes, comprising a wet wipes soak and a degradable composite non-woven fabric, wherein the wet wipes soak is introduced into an automatic wet wipes machine and sprayed on the degradable composite non-woven fabric; wherein the spraying amount of the degradable composite non-woven fabric is controlled to spray 2-6 mL of the wet wipes soak per gram of wet wipes.

2. The method for preparing a degradable polylactic acid wet wipe according to claim 1, wherein: The degradable composite non-woven fabric structure is obtained by laying 10-20 parts of a polylactic acid fiber layer, 20-30 parts of a lyocell fiber and natural cellulose composite layer, and 10-20 parts of a polylactic acid fiber layer in order, and then hydroentangled. The mass ratio of lyocell fiber to natural cellulose in the lyocell fiber and natural cellulose composite layer is 1:1-3.

3. The method for preparing a degradable polylactic acid wet wipe according to claim 2, wherein: The polylactic acid is one of poly D-lactic acid, poly L-lactic acid and poly DL-lactic acid.

4. The method for preparing a degradable polylactic acid wet wipe according to claim 2, wherein: The natural cellulose is one of bamboo fiber, wood fiber, hemp fiber and cotton fiber.

5. The method for preparing a degradable polylactic acid wet wipe according to claim 1, wherein: The preparation method of the wet wipes immersion liquid is as follows: Stir and mix 0.01-0.1 parts of fungicide, 1-5 parts of moisturizer, 1-5 parts of surfactant, 0.01-0.1 parts of chelating agent, 0.01-0.1 parts of synergist and 60-80 parts of deionized water until uniform.

6. The method for preparing a degradable polylactic acid wet wipe according to claim 5, wherein: The bactericide is one of chlorine dioxide and benzalkonium chloride.

7. The method for preparing a degradable polylactic acid wet wipe according to claim 5, wherein: The moisturizing agent is one of propylene glycol, glycerin, butylene glycol, sorbitol and hyaluronic acid.

8. The method for preparing a degradable polylactic acid wet wipe according to claim 5, wherein: The surfactant is one of sodium dodecylbenzenesulfonate, palmitic acid, sodium myristate and decyl glucoside.

9. The method for preparing a degradable polylactic acid wet wipe according to claim 5, wherein: The chelating agent is one of tetrasodium glutamate dicaprylate and disodium ethylenediaminetetraacetate.

10. The method for preparing a degradable polylactic acid wet wipe according to claim 5, wherein: The preparation method of the synergist is: In a stirred reactor, 10-20 parts of ficin, 2-5 parts of zinc sorbate, 0.004-0.04 parts of β-digalactosyl-A'-linolenoyl glyceride, 0.5-2 parts of baking soda, and 200-240 parts of ethanol were added by weight. The mixture was stirred at 60-70° C. for 50-80 minutes, and the ethanol was removed by distillation under reduced pressure to obtain a synergist.

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