Liquid composition aiming at yellowing of white clothes and application of liquid composition in clothes detergent

Abstract

The invention discloses a liquid composition aiming at yellowing of white clothes and application of the liquid composition in a clothes detergent, and particularly relates to the field of daily chemical washing, and the liquid composition is prepared from the following components in parts by mass: 8-15 parts of a structure modified surfactant, 7.8-23.5 parts of other surfactants, 0.3-1 part of a targeted enzyme preparation and 0.5-2 parts of a composite chelating agent; the structure modification surfactant is hydroxyl modified linear alkyl sodium benzenesulfonate; the detergent prepared according to the formula is excellent in whiteness, fabric fiber wear resistance, tensile strength and the like, can effectively prevent white clothes from yellowing, does not damage fabric fibers, meets market requirements and prolongs the service life of the clothes.

Description

Technical Field

[0001] This invention relates to the field of daily chemical washing and care products, and in particular to a liquid composition for treating yellowing of white clothing and its application in laundry detergents. Background Technology

[0002] White clothing often darkens or yellows due to frequent wearing and washing. This problem stems from several factors, primarily including: 1) The influence of chemical secretions: Sweat and oil secreted by the body, especially dirt from the neck and armpits, oxidize over time to form yellow substances. Metal ions in tap water combine with stains during washing, further accelerating the oxidation reaction. 2) The influence of detergent residue: Traditional laundry detergents are mostly alkaline. If the detergent is not thoroughly rinsed off during washing, the residue will react with the fabric fibers and acidic stains, exacerbating the yellowing. 3) The limitations of whitening agents: Many white garments use fluorescent whitening agents in their manufacturing process. Although they may initially make the garments appear brighter, these whitening agents easily oxidize and become ineffective after repeated washing, leading to a decrease in whiteness. 4) Natural aging: When clothing fibers are exposed to the environment for extended periods, their molecular structure is easily oxidized and aged, ultimately causing fading and yellowing.

[0003] Currently, there are products on the market designed to prevent yellowing of white clothing, such as collar cleaners, bleach, and high-efficiency laundry salts. These products primarily work by bleaching and whitening. However, traditional bleaching agents, such as chlorine bleach and oxygen bleach, have limitations, such as damaging fiber structure, shortening the lifespan of clothing, or causing environmental impact. Therefore, the market urgently needs a new detergent technology that can effectively prevent yellowing of white clothing without damaging fabric fibers. This invention addresses this problem. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a liquid composition for preventing yellowing of white clothing and its application in laundry detergents. The detergent prepared according to the formulation of the present invention can effectively prevent yellowing of white clothing without damaging the fabric fibers, thus meeting market demand and extending the service life of clothing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A liquid composition for treating yellowing of white clothing, comprising, by weight parts: 8-15 parts of a structure-modified surfactant, 7.8-23.5 parts of other surfactants, 0.3-1 part of a targeted enzyme preparation, and 0.5-2 parts of a complex chelating agent; the structure-modified surfactant is hydroxyl-modified linear alkylbenzene sulfonate sodium, with the following structural formula: By modifying the structure of linear alkylbenzene sulfonate sodium, hydroxyl groups are introduced into the benzene ring molecular structure to form a phenolic structure with better affinity. This type of structure can improve the abrasion resistance and tensile strength of fabric fibers.

[0006] The aforementioned liquid composition for treating yellowing of white clothing comprises, by weight parts: 8-15 parts of a structure-modified surfactant, 7.8-23.5 parts of other surfactants, 0.8-1.2 parts of a complex chelating agent, 2.8-5.3 parts of a neutralizing agent, 0.3-1 part of a targeted enzyme preparation, 0.1 part of other enzyme preparations, 0.5-0.8 parts of an anti-color bleeding agent, 1.2-1.6 parts of a viscosity modifier, 0.1-0.3 parts of a pH buffer, 0.1 part of a preservative, and 61.4-68.1 parts of deionized water; the structure-modified surfactant is hydroxyl-modified linear alkylbenzene sulfonate sodium, with the following structural formula: .

[0007] The aforementioned liquid composition for treating yellowing of white clothing includes, among other surfactants, one or more combinations of: sodium fatty alcohol polyoxyethylene ether sulfate, sodium α-olefin sulfonate, sodium fatty acid, fatty alcohol polyoxyethylene ether, alkyl glycoside, cocamidopropyl betaine, and coconut oil monoethanolamide. The range of other surfactants is not limited; they can be anionic, nonionic, or amphoteric surfactants, as long as they are suitable for the formulation of this invention.

[0008] The aforementioned liquid composition for treating yellowing of white clothing comprises, by weight parts: 8-15 parts of a structure-modified surfactant, 5-10 parts of AES, 0-3 parts of sodium olefin sulfonate, 0-10 parts of cocamidopropyl betaine, 0-1 part of APG, 2.8-3.5 parts of AEO-9, 0.8-1.2 parts of a complex chelating agent, 2.8-5.3 parts of a neutralizing agent, 0.3-1 part of a targeted enzyme preparation, 0.1 part of other enzyme preparations, 0.5-0.8 parts of an anti-color bleeding agent, 1.2-1.6 parts of a viscosity modifier, 0.1-0.3 parts of a pH buffer, 0.1 part of a preservative, and 61.4-68.1 parts of deionized water; the structure-modified surfactant is hydroxyl-modified linear alkylbenzene sulfonate, with the following structural formula: .

[0009] The aforementioned liquid composition for treating yellowing of white clothing includes a targeted enzyme preparation that is a combination of lipase and mannanase, with a mass ratio of lipase to mannanase of 1:1-2:1, preferably 1.5:1-2:1. The targeted enzyme preparation targets and decomposes grease and sebum stains in the liquid detergent, eliminating yellowing of clothing at its source.

[0010] The aforementioned liquid composition for treating yellowing of white clothing uses a composite chelating agent consisting of phytic acid and EDTA-2Na, with a mass ratio of phytic acid to EDTA-2Na of 1.5:1-2:1, preferably 5:3-2:1. Chelating agents used in conventional detergents, such as EDTA-2Na and GLDA-4Na, can chelate metal ions (Ca...). 2+ Mg 2+ Fe 3+ However, the chelating power is limited and it is easy to deposit on the fabric fibers. After repeated washing, the whiteness of the fabric will decrease. This invention uses a combination of macromolecular chelating agent phytic acid and chelating agent EDTA-2Na. The two can be combined to enhance the effect and have a stronger chelating power for metal ions, reducing the impact of metal ions in tap water on the color of clothing.

[0011] The aforementioned liquid composition for treating yellowing of white clothing includes a neutralizing agent of liquid alkali; a pH buffer comprising one or more of citric acid, sodium citrate, or liquid alkali; a viscosity modifier comprising one or more of sodium chloride, potassium chloride, or sodium sulfate; a preservative comprising one or more of 2-methyl-4-isothiazolin-3-one (MIT), 2-methyl-5-chloro-4-isothiazolin-3-one (CMIT), or 1,2-benzisisothiazolin-3-one (BIT); and an anti-bleeding agent comprising one or more of vinylimidazole or vinylpyrrolidone weak cationic polymers.

[0012] The aforementioned liquid composition for treating yellowing of white clothing is applied in laundry detergents.

[0013] The advantages of this invention are: This invention modifies the structure of linear alkylbenzene sulfonate by introducing hydroxyl groups into the benzene ring molecular structure, forming a phenolic structure with better affinity. Compared with the unmodified structure, this type of structure can improve the abrasion resistance and tensile strength of fabric fibers.

[0014] This invention uses a combination of macromolecular chelating agent phytic acid and chelating agent EDTA-2Na. The two can be combined to enhance their synergistic effect, resulting in a stronger chelation force for metal ions and reducing the impact of metal ions in tap water on the color of clothing.

[0015] The synergistic effect of the mannanase and lipase targeted enzyme preparations of this invention improves the whiteness retention performance of the liquid composition on fabrics.

[0016] This invention utilizes modified surfactants, innovative molecular structure technology, and combined with targeted cleaning and composite chelating agent technology to prepare a laundry detergent that achieves significant progress compared to traditional detergents in maintaining the whiteness of white clothes and extending their lifespan, meeting market demands and possessing market competitiveness.

[0017] Definition of the noun: LAS: Sodium linear alkylbenzene sulfonate, carbon chain length 12-14, purity 96%. Structure-modified surfactant: Modified linear alkylbenzene sulfonate sodium, carbon chain length 12-14, purity 96%, molecular formula is AES: Sodium fatty alcohol polyoxyethylene ether sulfate, the carbon chain length of the fatty alcohol is 12-14, the average EO number is 2, and the purity is 70%.

[0018] Coconut oil fatty acids: The carbon chain length of coconut oil ranges from 8 to 18. AEO-9: Fatty alcohol polyoxyethylene ether, the carbon chain length of the fatty alcohol is 12-14, and the average number of EOs is 9; AEO-7: Fatty alcohol polyoxyethylene ether, the carbon chain length of the fatty alcohol is 12-14, and the average number of EOs is 7; AOS: Sodium α-olefin sulfonate, where the carbon chain length of the α-olefin is 12-18; Cocamidopropyl betaine, abbreviated as CAB, with a purity of 35%, is an amphoteric surfactant.

[0019] Coconut oil monoethanolamide, abbreviated as CMEA, is a nonionic surfactant. Detailed Implementation

[0020] The present invention will be described in detail below with reference to specific embodiments.

[0021] The effectiveness of the present invention is verified through the following experiments: Unless otherwise specified, the raw materials and reagents used in the following examples are all commercially available standard products.

[0022] Viscosity: refers to the viscosity obtained by using a Bollerfeld DV-II rotational viscometer with a No. 4 rotor and a rotation speed of 100 rad / s after the sample is kept at 25℃ for 20 min, generally controlled between 700 mpas and 1500 mpas.

[0023] pH: refers to the test temperature of 25℃. The sample solution is prepared with freshly boiled and cooled distilled water, and the mass concentration of the sample solution is 10%. The solution is measured after mixing.

[0024] Product stability: Referring to QB / T 1224 Liquid Detergents for Clothing, the heat and cold resistance stability of the samples were tested. Samples were placed at (40±2)℃ and (-5±2)℃ for 24 h respectively, and then observed after returning to room temperature. If stratification, precipitation, or sedimentation occurred, the sample was marked as "unqualified." If the appearance was uniform, stable, and without stratification, precipitation, or sedimentation, the sample was marked as "qualified." Whiteness: According to GB / T 13174-2021, the method for determining the detergency and cyclic washing performance of detergents for clothing, the test garment was simulated for actual wear and cyclic washing for 15 cycles. Three test points were taken on the same garment (collar, cuff, and armpit). The whiteness value (defluorinating) after 15 cycles of washing was read at 457nm using a whiteness meter. The average whiteness value at different measurement points is the initial (after wearing) whiteness value F of the garment. The difference between the whiteness F2 after wearing and the initial whiteness F1 is recorded as the whiteness difference. When the whiteness difference is >10, a significant visual effect can be observed.

[0025] Fabric tensile properties: According to GB / T 3923.1-2013 Textiles - Tensile Properties of Fabrics. Specifically, two sets of fabric pieces are cut from the same location on the test garment: one set for the warp (or longitudinal) direction and one set for the weft (or transverse) direction. The effective width of each piece is 50 mm ± 0.5 mm (excluding raw edges), and the length is 230 mm. The breaking elongation ΔL is tested, and the breaking elongation ΔL is measured after 15 washes using the test sample. S The breaking elongation rate after 15 washes with conventional detergent is ΔL. d The ratio of breakage elongation to breakage elongation = (ΔL) S - △L d ) / △L S When the ratio of the breakage elongation rate to the breakage elongation rate is greater than 10%, it is recorded as "there is a difference"; when the ratio of the breakage elongation rate to the breakage elongation rate is less than 10%, it is recorded as "no significant difference".

[0026] Fabric abrasion resistance: Determination of fabric abrasion resistance according to GB-T 21196.4-2007 Textiles - Martindale method. Specifically: Cut a 150mm strip of fabric from the same location on the garment, clamp it, and rub it for a given number of times (≤48 times). Visually observe the fabric and perform an abrasion test after the same number of rubs. Evaluate the surface changes in the friction area of ​​the sample. If the sample surface changes color, pills, or fuzzes, record it as "B"; if the sample surface does not change color, pill, or fuzz, record it as "A". Prepare the washing solution according to the formula in Table 1: Table 1 Formulation Examples Note: Lipase is lipase LL100, mannanase is mannanase M9, and phytic acid is macromolecular phytic acid (CAS: 83-86-3, molecular formula C6H). 18 O 24 P6), the neutralizing agent is liquid alkali, the pH buffer is citric acid (sodium); the viscosity modifier is sodium chloride; the preservative is Kathon; the anti-color bleeding agent is modified polyvinylpyrrolidone, trade name HD-56K.

[0027] At room temperature, in a beaker, following the proportions and dosages of the formulation example, first add a portion of deionized water, a composite chelating agent, liquid alkali, and a structure-modifying surfactant, stirring thoroughly until completely reacted and dissolved. Then, add the other surfactants sequentially, stirring thoroughly until dissolved. Add a pH buffer to adjust the product's pH value (10% aqueous solution) to between 7 and 8. Below 40°C, add the targeted enzyme preparation, enzyme preparation, anti-color bleeding agent, preservative, and viscosity modifier, and replenish the deionized water to obtain the formulation example shown in Table 1.

[0028] The performance of the liquid compositions obtained in the above examples was tested, and the test results are summarized in Table 2. Table 2 shows that when the content of the structure-modified surfactant is 8-15 parts, the composite chelating agent is 0.5-2 parts, and the targeted enzyme preparation is 0.3-1 parts, the difference in whiteness value between the white shirts washed 15 times in Examples 1-3 and those washed 15 times with conventional detergent is >10. Furthermore, compared to those washed 15 times with conventional detergent, the fabric tensile strength and abrasion resistance of the white shirts washed 15 times with Examples 1-3 are superior. In Examples 4 and 5, when the content of the structure-modified surfactant is <8%, the difference in whiteness value of the washed garments is not significant. When the content of the structure-modified surfactant is >15%, the stability of the liquid composition does not meet the requirements.

[0029] Table 2 Test results of formulation examples To further verify the technical effect of the present invention, the following comparative experiment was conducted: Comparative Experiment 1: Comparative Example 3 was based on Example 1, but the modified sulfonic acid was adjusted to 15% sulfonic acid, while the other components remained unchanged; Comparative Example 4 was based on Example 2, but the modified sulfonic acid was adjusted to 10% sulfonic acid, while the other components remained unchanged; Comparative Example 5 was based on Example 3, except that the modified sulfonic acid was adjusted to 8% sulfonic acid, while all other components remained unchanged; After 15 cycles of washing with samples 3-5, the whiteness, breaking elongation, and abrasion resistance of the fabrics were tested. The experimental results are shown in Table 3: Table 3. Comparative Performance Test Results From the results in Table 3, we can see that: 1) The whiteness values ​​of the clothes washed in Comparative Examples 3, 4, and 5 did not change significantly compared to Examples 1, 2, and 3; 2) The elongation and abrasion resistance of the washed clothes in Comparative Examples 3, 4, and 5 were slightly lower than those in Examples 1, 2, and 3.

[0030] Therefore, it can be seen that the modified sulfonic acid, in synergy with this formula, can improve the tensile strength and abrasion resistance of the detergent prepared by this formula.

[0031] Comparative Experiment 2: Comparative Examples 6 and 7 were based on Example 1, except that the composite chelating agent was replaced with a single chelating agent, while all other components remained unchanged. Specifically, EDTA-2Na was 0.9% in Comparative Example 6, and phytic acid was 0.9% in Comparative Example 7. After 15 cycles of washing, the whiteness of Comparative Examples 6 and 7 was tested. The experimental results are shown in Table 4. Table 4. Comparative Performance Test Results The results in Table 4 show that the whiteness values ​​of Examples 6 and 7 are significantly lower than those of Example 1. The absence of either EDTA-2Na or phytic acid results in the inability to obtain a detergent with excellent whiteness performance. This indicates that the synergistic effect of the chelating agent improves the whiteness retention performance of the liquid composition on the fabric.

[0032] Comparative Experiment 3: Comparative Examples 8 and 9 were based on Example 1, except that the targeted enzyme preparation was replaced with a single enzyme preparation, while all other components remained unchanged. Comparative Example 8 used mannanase at a dosage of 0.6%, and Comparative Example 9 used lipase at a dosage of 0.6%. Whiteness tests were performed on Comparative Examples 8 and 9, and the experimental results are shown in Table 5. Table 5. Comparative Performance Test Results The results in Table 5 show that the whiteness values ​​of Comparative Examples 8 and 9 are significantly lower than those of Example 1. The absence of either mannanase or lipase prevents the production of detergents with excellent whiteness performance. This indicates that the synergistic effect of the targeted enzyme preparations improves the whiteness retention performance of the liquid composition on fabrics.

[0033] The above experiments show that: This invention, through structural modification of linear alkylbenzene sulfonate sodium, introduces hydroxyl groups into the benzene ring molecular structure, forming a phenolic structure with better affinity. Compared to the unmodified structure, this type of structure can improve the abrasion resistance and tensile strength of fabric fibers. This invention uses a combination of the macromolecular chelating agent phytic acid and the chelating agent EDTA-2Na, which can synergistically enhance the effect of the combination, resulting in stronger chelation of metal ions and reducing the impact of metal ions in tap water on the color of clothing. The synergistic effect of mannanase and lipase-targeted enzyme preparations improves the whiteness retention performance of the liquid composition on fabrics. The detergent prepared according to the formulation required by this invention exhibits excellent performance in whiteness, fabric fiber abrasion resistance, and tensile strength. It effectively prevents yellowing of white clothing without damaging fabric fibers, meeting market demand and extending the service life of clothing.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A liquid composition for treating yellowing of white clothing, characterized in that, The composition by weight includes: 8-15 parts of structure-modified surfactant, 7.8-23.5 parts of other surfactants, 0.3-1 part of targeted enzyme preparation, and 0.5-2 parts of complex chelating agent; the structure-modified surfactant is hydroxyl-modified linear alkylbenzene sulfonate sodium, with the following structural formula: 。 2. The liquid composition for treating yellowing of white clothing according to claim 1, characterized in that, The composition by weight is as follows: 8-15 parts of structure-modified surfactant, 7.8-23.5 parts of other surfactants, 0.8-1.2 parts of composite chelating agent, 2.8-5.3 parts of neutralizing agent, 0.3-1 part of targeted enzyme preparation, 0.1 part of other enzyme preparation, 0.5-0.8 parts of anti-color bleeding agent, 1.2-1.6 parts of viscosity modifier, 0.1-0.3 parts of pH buffer, 0.1 part of preservative, and 61.4-68.1 parts of deionized water; wherein the structure-modified surfactant is hydroxyl-modified linear alkylbenzene sulfonate sodium, with the following structural formula: 。 3. The liquid composition for treating yellowing of white clothing according to claim 2, characterized in that, The other surfactants include one or more combinations of sodium fatty alcohol polyoxyethylene ether sulfate, sodium α-olefin sulfonate, sodium fatty acid, fatty alcohol polyoxyethylene ether, alkyl glycoside, cocamidopropyl betaine, and coconut oil monoethanolamide.

4. The liquid composition for treating yellowing of white clothing according to claim 1, characterized in that, The composition by weight is as follows: 8-15 parts of structure-modified surfactant, 5-10 parts of AES, 0-3 parts of sodium olefin sulfonate, 0-10 parts of cocamidopropyl betaine, 0-1 part of APG, 2.8-3.5 parts of AEO-9, 0.8-1.2 parts of compound chelating agent, 2.8-5.3 parts of neutralizing agent, 0.3-1 part of targeted enzyme preparation, 0.1 part of other enzyme preparation, 0.5-0.8 parts of anti-color bleeding agent, 1.2-1.6 parts of viscosity modifier, 0.1-0.3 parts of pH buffer, 0.1 part of preservative, and 61.4-68.1 parts of deionized water; wherein the structure-modified surfactant is hydroxyl-modified linear alkylbenzene sulfonate, with the following structural formula: 。 5. A liquid composition for treating yellowing of white clothing according to any one of claims 1-4, characterized in that, The targeted enzyme preparation is a combination of lipase and mannanase, with a mass ratio of lipase to mannanase of 1:1-2:1, preferably 1.5:1-2:

1.

6. A liquid composition for treating yellowing of white clothing according to any one of claims 1-4, characterized in that, The composite chelating agent is a combination of phytic acid and EDTA-2Na, wherein the mass ratio of phytic acid to EDTA-2Na is 1.5:1-2:1, preferably 5:3-2:

1.

7. A liquid composition for treating yellowing of white clothing according to any one of claims 1-4, characterized in that, The neutralizing agent is liquid alkali; the pH buffer includes one or a combination of citric acid, sodium citrate, or liquid alkali; the viscosity modifier includes one or a combination of sodium chloride, potassium chloride, or sodium sulfate; the preservative includes one or a combination of 2-methyl-4-isothiazolin-3-one (MIT), 2-methyl-5-chloro-4-isothiazolin-3-one (CMIT), or 1,2-benzisisothiazolin-3-one (BIT); and the anti-color bleeding agent is one or a combination of vinylimidazole or vinylpyrrolidone weak cationic polymers.

8. A liquid composition for treating yellowing of white clothing according to any one of claims 1-4, characterized in that, The viscosity of the composition is 500-2000 mPa•s; The pH value is 7.0-8.

0.

9. The application of the liquid composition for treating yellowing of white clothing as described in claim 1, characterized in that, It is used in laundry detergents.

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