Laundry detergent for sunscreen clothes and preparation method of laundry detergent

Abstract

The invention provides a laundry detergent for sunscreen clothes. The laundry detergent comprises the following components in percentage by mass: 1-10% of a nonionic surfactant, 5-15% of an anionic surfactant, 1-8% of coco propyl betaine, 1-2% of an anti-redeposition agent, 1-15% of an auxiliary agent and the balance of a solvent, wherein the anti-redeposition agent is a three-dimensional polymer formed by reacting sorbitol with acrylic acid to obtain an intermediate product and then copolymerizing the intermediate product with acrylic acid and acrylate. The anti-redeposition agent is compounded with the anionic surfactant, the nonionic surfactant and the ampholytic surfactant to obtain the sunscreen clothes laundry detergent product, a layer of protective film can be formed on clothes after washing, direct contact between the surfactant in the laundry detergent and a sunscreen agent in the sunscreen clothes is effectively prevented, and dissolution and loss of the sunscreen agent are reduced. The laundry detergent has the advantages of good stability and strong decontamination capability, can prevent secondary pollution of clothes caused by stains, and solves the problems in the prior art.

Description

Technical Field

[0001] This invention relates to the field of detergent technology, specifically to a sun-protective laundry detergent and its preparation method. Background Technology

[0002] With the improvement of people's living standards and the enhancement of health awareness, sun-protective clothing is being used more and more widely in daily life. Sun-protective clothing can effectively block ultraviolet rays from damaging the skin. Its core function is to block ultraviolet rays through special fabric structures (such as high-density weaving and microporous film composites) or functional coatings (such as inorganic sunscreens containing zinc oxide, titanium dioxide, etc., or organic sunscreen ingredients such as benzotriazole). It usually needs to reach the standard of UPF (ultraviolet protection factor) ≥50+ to effectively block more than 98% of UVA and UVB.

[0003] The mainstream materials for sun-protective clothing are primarily chemical fibers, including polyester, nylon, and spandex blends. Some high-end products utilize a composite process combining regenerated cellulose fibers with sunscreen agents. These materials and their added sun-protective coatings exhibit multiple sensitivities during cleaning: firstly, the fabrics themselves have poor alkali resistance, and excessive washing or high-temperature treatment can easily lead to fiber embrittlement and reduced breathability; secondly, the sun-protective coating (especially the nanoparticle layer formed by physical sunscreens) is easily eroded by chemical reagents, mechanical friction, or high temperatures, directly causing a sharp drop in the UPF value and loss of sun protection function. Furthermore, in daily use, sun-protective clothing faces complex types of stains that are particularly difficult to clean.

[0004] In addition, existing "mild" neutral laundry detergents mostly focus on protecting natural fibers such as wool and silk, and do not have functional ingredients designed for the special materials and coatings of sun-protective clothing. They cannot meet the dual needs of effectively removing complex stains and maintaining the stability of UPF value.

[0005] Therefore, developing a laundry detergent specifically for sun-protective clothing requires overcoming existing technological bottlenecks and achieving a triple balance in the formula: first, having highly efficient cleaning ability; second, avoiding damage to the sun-protective coating and fabric structure from chemical components; and third, reducing physical friction damage during the washing process, thereby extending the service life and protective efficacy of sun-protective clothing. This need has become an important research and development direction in the field of textile care. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a sun-protective laundry detergent and its preparation method. This invention uses an anti-redeposition agent combined with anionic surfactants, nonionic surfactants, and amphoteric surfactants to obtain a sun-protective laundry detergent product. After washing, it forms a protective film on clothing, effectively preventing direct contact between the surfactants in the detergent and the sunscreen agents in the clothing, thus reducing the dissolution and loss of the sunscreen agents. While possessing good stability and strong detergency, it also prevents stains from causing secondary contamination of clothing, solving the problems existing in the prior art and having significant implications for the development of laundry detergent products.

[0007] One object of the present invention is to provide a sun-protective laundry detergent, the sun-protective laundry detergent comprising the following components by mass fraction:

[0008]

[0009] The anti-redeposition agent is a three-dimensional polymer formed by the reaction of sorbitol and acrylic acid to obtain an intermediate product, which is then copolymerized with acrylic acid and acrylate.

[0010] Furthermore, the acrylate is selected from C10-C18 acrylates.

[0011] Furthermore, the nonionic surfactant is selected from one or more of secondary alcohol polyoxyethylene ethers, fatty alcohol polyoxyethylene ethers, isomeric alcohol ether polyoxyethylene ethers, and fatty acid methyl ester ethoxylates.

[0012] Furthermore, the anionic surfactant is selected from one or more of alkylbenzene sulfonic acid and its salts, fatty acids and their salts, alkyl sulfates, ethoxylated fatty alcohol sulfates, α-olefin sulfonates, sulfosuccinates, fatty acid alkyl ester sulfonates, ethoxylated fatty alcohol ether carboxylates, and amino acid salts.

[0013] Furthermore, the additives are selected from one or more of chelating agents, fragrances, preservatives, sodium citrate, and pH adjusters.

[0014] Another object of the present invention is to provide a method for preparing a sun-protective laundry detergent, the method comprising the following steps:

[0015] S1. Sorbitol, acrylic acid, catalyst, and polymerization inhibitor are mixed, heated and stirred to react, and an intermediate product is obtained.

[0016] S2. Mix the intermediate product, acrylic acid, acrylate and initiator, and heat and stir the mixture under nitrogen to obtain the anti-redeposition agent.

[0017] S3. Mix the anti-redeposition agent with other ingredients, adjust the pH value, and filter to obtain the sunscreen laundry detergent.

[0018] Further, in step S1, the temperature of the heating and stirring reaction is 80-120℃, and in step S2, the temperature of the heating and stirring reaction is 70-85℃.

[0019] Further, in step S1, the molar ratio of sorbitol to acrylic acid is 1:5-7.

[0020] Further, in step S2, the molar ratio of the intermediate product, acrylic acid, and acrylate is 1:20-30:20-30.

[0021] Furthermore, in step S3, the pH is 6.0-8.0.

[0022] The present invention has the following beneficial effects:

[0023] The sun-protective laundry detergent of this invention is a compound of a specific anti-redeposition agent and anionic and nonionic surfactants. The anti-redeposition agent is obtained by first esterifying sorbitol with acrylic acid to obtain an intermediate product, and then polymerizing it with long-chain acrylates and acrylic acid. This component contains a large number of active carboxyl groups, which can adsorb onto the fabric surface, and also contains a large number of long alkyl groups, which facilitates film formation. Furthermore, it has a three-dimensional structure, resulting in better film formation on the fabric surface and thus improving the ability to prevent the redeposition of dirt. In addition, the large polymer molecules adhere to the surface of the fabric fibers, reducing friction between fibers and forming a protective film, making the clothing softer and reducing damage to the sun-protective layer of the clothing. Simultaneously, the hydrophilic carboxyl groups and hydrophobic fatty acid segments in the anti-redeposition agent provide amphiphilic properties, resulting in good compatibility with other components. This not only enhances the stability of the laundry detergent under various conditions, making the product last longer, but also facilitates synergistic effects with other surfactants, improving washing and stain removal efficiency. Detailed Implementation

[0024] To more clearly illustrate the technical solution of the present invention, the following embodiments are provided. Unless otherwise stated, the raw materials, reactions, and post-processing methods appearing in the embodiments are all commercially available raw materials and technical methods well known to those skilled in the art.

[0025] The terms "preferred," "more preferably," and "more suitable" used in this invention refer to embodiments of the invention that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this invention.

[0026] It should be understood that, except in any operational instance or otherwise indicated, the amounts or all figures representing ingredients used, for example, in the specification and claims, should be understood to be modified by the term "about" in all cases. Therefore, unless otherwise stated, the numerical parameters set forth in the following specification and appended claims are approximate values ​​varying according to the desired performance to be obtained according to the invention.

[0027] In the examples and comparative examples, the following substances will be used and have the stated functions, and all preparations will take place at 25°C.

[0028] In the embodiments described, the following abbreviations will be used and will have the indicated functions.

[0029] AEO9, fatty alcohol polyoxyethylene ether, nonionic surfactant, purchased from BASF.

[0030] CAB, cocamidopropyl betaine, an amphoteric surfactant, was purchased from Tianci.

[0031] AES, sodium fatty alcohol polyoxyethylene ether sulfate, an anionic surfactant, purchased from Lichen.

[0032] Chelating agent, tetrasodium glutamate diacetate, purchased from Norinon.

[0033] Citric acid, a pH adjuster.

[0034] Fragrance, cherry blossom fragrance, purchased from IFF International Fragrance Company.

[0035] Preservative: Nipaguard CG Kathon.

[0036] Unless otherwise specified, the water used in the embodiments of this invention refers to deionized water.

[0037] The composition and content of the sun-protective clothing laundry detergents in Examples 1-3 are shown in Table 1.

[0038] Table 1 Composition ratio of laundry detergent samples in Examples 1-3

[0039]

[0040] The preparation method of the concentrated laundry detergent in Examples 1-3 includes the following steps:

[0041] S1. Sorbitol and acrylic acid in a molar ratio of 1:6 are mixed and added to a reaction vessel. Toluene is used as a solvent. 1% p-toluenesulfonic acid catalyst and 0.2% hydroquinone polymerization inhibitor are added according to the total mass of the reactants. The mixture is stirred at 100°C for 7 hours. After removing the solvent, an intermediate product is obtained.

[0042] S2. The intermediate product, acrylic acid, and dodecyl acrylate are mixed in a molar ratio of 1:25:25. A water-ethanol mixture with a mass ratio of 8:2 is used as a solvent. Ammonium persulfate initiator accounting for 1% of the total mass of the reactants is added. The mixture is stirred and reacted for 5 hours under nitrogen protection at 80°C. After removing the solvent, the anti-redeposition agent is obtained.

[0043] S3. Mix the anti-redeposition agent with other ingredients in the above proportions, adjust the pH to 7.0 with citric acid, and filter to obtain the sunscreen laundry detergent.

[0044] Comparative Examples 1-2 are set up based on Example 1, and the difference from Example 1 is that:

[0045] In Comparative Example 1, sorbitol in step S1 was replaced with 1,6-hexanediol, and the other components and preparation methods were the same as in Example 1.

[0046] In Comparative Example 2, dodecyl acrylate in step S2 was replaced with butyl acrylate, while other components and preparation methods were the same as in Example 1.

[0047] Test Example 1

[0048] The stability performance of the laundry detergent samples prepared in Examples 1-3 and Comparative Examples 1-2 was tested.

[0049] Test method:

[0050] Low temperature stability: After sealing the laundry detergent in separate bottles, place them in an environment of 0±2℃ and keep them at a constant temperature for 1 month. Observe whether there is any obvious discoloration, layering or precipitation in the appearance of the laundry detergent. If there is no obvious discoloration, layering or precipitation, it is judged to be qualified for low temperature stability.

[0051] Room temperature stability: After sealing the laundry detergent in separate bottles, place them in an environment of 25±2℃ for 1 month. Observe whether there is any obvious discoloration, layering or precipitation in the appearance of the laundry detergent. If there is no obvious discoloration, layering or precipitation, it is judged to be qualified for room temperature stability.

[0052] High-temperature stability: After sealing the laundry detergent in separate bottles, place them in an environment of 45±2℃ for one month. Observe whether there is any obvious discoloration, layering or precipitation in the appearance of the laundry detergent. If there is no obvious discoloration, layering or precipitation, it is judged to be qualified for high-temperature stability.

[0053] The test results are shown in Table 2.

[0054] Table 2 Stability Test Results

[0055] sample Low temperature stability room temperature stability High temperature stability Example 1 qualified qualified qualified Example 2 qualified qualified qualified Example 3 qualified qualified qualified Comparative Example 1 qualified qualified qualified Comparative Example 2 Layering qualified qualified

[0056] As shown in Table 2, the samples prepared in Examples 1, 2, and 3 did not exhibit stratification, precipitation, or significant color change after being placed at different temperatures for one month, demonstrating good stability. The addition of the anti-redeposition agent had no significant impact on product stability. In Comparative Example 2, where dodecyl acrylate was replaced with butyl acrylate, the sample showed stratification at low temperatures, indicating reduced stability.

[0057] Test Example 2

[0058] The sun protection performance of the laundry detergent samples prepared in Examples 1-3 and Comparative Examples 1-2 was tested.

[0059] Test method:

[0060] According to GB / T 18830-2009 "Evaluation Standard for Ultraviolet Protection Performance of Textiles", the UPF value of sun protection clothing was tested before washing and after 10 washes.

[0061] The test results are shown in Table 3.

[0062] Table 3. Results of Sun Protection Performance Tests

[0063]

[0064]

[0065] As can be seen from Table 3, the UPF value of the laundry detergent in Examples 1-3 decreased less than that of the laundry detergent in Comparative Examples 1-2 before and after washing the sunscreen clothing. Therefore, it can be inferred that the formulation uses an anti-redeposition agent and a surfactant in combination, which effectively reduces the dissolution and loss of sunscreen agents in the sunscreen clothing.

[0066] Test Example 3

[0067] The stain removal performance of the laundry detergent samples prepared in Examples 1-3 and Comparative Examples 1-2 was tested.

[0068] Test method: The detergency was tested according to GB / T 13174-2008, "Determination of detergency and recycle performance of detergents for clothing". The results are shown in Table 4, where the P-value represents the detergency ratio. Generally, a standard laundry detergent is used as a reference sample, and its detergency ratio is set to 1.00. The higher the P-value, the better the cleaning power.

[0069] Table 4. Results of Decontamination Performance Test

[0070]

[0071] Table 4 shows that the laundry detergents in Examples 1-3 are significantly better at removing carbon black, protein, and sebum than the comparative and standard laundry detergents. This suggests that the formulation using an anti-redeposition agent and a surfactant can achieve a more efficient cleaning effect, which is a significant improvement over existing technologies.

[0072] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0073] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A laundry detergent for sun-protective clothing, characterized in that, The sun-protective laundry detergent comprises the following ingredients by mass fraction: The anti-redeposition agent is a three-dimensional polymer formed by the reaction of sorbitol and acrylic acid to obtain an intermediate product, which is then copolymerized with acrylic acid and acrylate.

2. The sun-protective laundry detergent according to claim 1, characterized in that, The acrylate is selected from C10-C18 acrylates.

3. The sun-protective laundry detergent according to claim 1, characterized in that, The nonionic surfactant is selected from one or more of secondary alcohol polyoxyethylene ethers, fatty alcohol polyoxyethylene ethers, isomeric alcohol ether polyoxyethylene ethers, and fatty acid methyl ester ethoxylates.

4. The sun-protective laundry detergent according to claim 1, characterized in that, The anionic surfactant is selected from one or more of the following: alkylbenzene sulfonic acid and its salts, fatty acids and their salts, alkyl sulfates, ethoxylated fatty alcohol sulfates, α-olefin sulfonates, sulfosuccinates, fatty acid alkyl ester sulfonates, ethoxylated fatty alcohol ether carboxylates, and amino acid salts.

5. The sun-protective laundry detergent according to claim 1, characterized in that, The additives are selected from one or more of chelating agents, fragrances, preservatives, sodium citrate, and pH adjusters.

6. The method for preparing the sun-protective laundry detergent according to any one of claims 1-5, characterized in that, The preparation method of the sun-protective laundry detergent includes the following steps: S1. Sorbitol, acrylic acid and catalyst are mixed and heated and stirred to react, yielding an intermediate product; S2. Mix the intermediate product, acrylic acid, acrylate and initiator, heat and stir to react, and obtain the anti-redeposition agent; S3. Mix the anti-redeposition agent with other ingredients, adjust the pH value, and filter to obtain the sunscreen laundry detergent.

7. The method for preparing the sun-protective laundry detergent according to claim 6, characterized in that, In step S1, the temperature of the heating and stirring reaction is 80-120℃, and in step S2, the temperature of the heating and stirring reaction is 70-85℃.

8. The method for preparing the sun-protective laundry detergent according to claim 6, characterized in that, In step S1, the molar ratio of sorbitol to acrylic acid is 1:5-7.

9. The method for preparing the sun-protective laundry detergent according to claim 6, characterized in that, In step S2, the molar ratio of the intermediate product, acrylic acid, and acrylate is 1:20-30:20-30.

10. The method for preparing the sun-protective laundry detergent according to claim 6, characterized in that, In step S3, the pH is 6.0-8.0.

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