Color-protecting laundry detergent containing plant extracts and preparation method of color-protecting laundry detergent

Abstract

The invention relates to the technical field of daily chemicals, in particular to a color-protecting laundry detergent containing plant extracts and a preparation method of the color-protecting laundry detergent. The color-protecting laundry detergent is prepared from the following components in percentage by mass: 12.5 to 18.3 percent of natural anionic surfactant, 6.4 to 9.7 percent of nonionic surfactant, 3.2 to 5.8 percent of plant polyphenol extract, 3.0 to 5.2 percent of fiber affinity natural polymer, 2.1 to 4.0 percent of bio-based chelating aid, 1.8 to 3.5 percent of natural glycoside synergist, 0.9 to 2.3 percent of pH buffering agent, 0.6 to 1.4 percent of antioxidant plant essential oil and the balance of deionized water. The compound protease comprises alkaline protease, neutral protease and papain; the invention aims to solve the technical problems that the existing laundry detergent is poor in color protection effect, insufficient in environmental protection performance and large in damage to fabrics, and provides a laundry detergent product which takes natural plant extracts as core components and has an efficient color protection function.

Description

Technical Field

[0001] This invention relates to the field of daily chemical products technology, and in particular to a color-protecting laundry detergent containing plant extracts and its preparation method. Background Technology

[0002] Laundry powder has always held a dominant position among laundry products. However, laundry powder does not completely dissolve during use, and the residue can easily damage clothes and is difficult to rinse. In contrast, liquid laundry detergent dissolves completely and quickly, is easy to rinse, and does not harm skin or clothes. Laundry powder is generally highly alkaline and can irritate the skin, while liquid laundry detergent has a near-neutral pH and a gentle formula that is not harsh on hands. This shows that liquid laundry detergent has a higher technological content, making it easier to add various effective ingredients. After washing, clothes are fluffy, soft, smooth, and shiny, and it also has antibacterial and long-lasting fragrance effects. With its lower overall cost, it is gaining widespread acceptance.

[0003] However, most existing laundry detergents rely on synthetic surfactants, color-protecting additives, and chemical auxiliaries. While they possess good stain-removing properties, they generally damage clothing fibers, especially after multiple washes, leading to fading and discoloration, and the accumulation of chemical components. Furthermore, existing color-protecting additives are mostly synthetic organic compounds, which have poor biodegradability and questionable safety, making it difficult to meet the needs of green and healthy washing.

[0004] Therefore, how to build a green and healthy laundry detergent system that is based on natural sources, has high chemical stability, controllable processes, and is environmentally friendly has become a technical bottleneck that urgently needs to be overcome in this field. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a color-protecting laundry detergent containing plant extracts and its preparation method, which can effectively solve the problems of existing laundry detergents damaging clothing fibers, causing clothes to fade and change color after multiple washes, and accumulating chemical components. At the same time, it can also solve the problems of poor biodegradability, questionable safety, and difficulty in meeting the needs of green and healthy washing. This invention provides a new type of laundry detergent with natural plant extracts as the core ingredient, which has both high-efficiency color protection function and environmentally friendly characteristics.

[0006] The technical solution of the present invention is as follows: The first aspect of the present invention provides a color-protecting laundry detergent containing plant extracts, comprising, by weight percentage: 12.5-18.3% natural anionic surfactant, 6.4-9.7% nonionic surfactant, 3.2-5.8% plant polyphenol extract, 3.0-5.2% fiber-affinity natural polymer, 2.1-4.0% bio-based chelating agent, 1.8-3.5% natural glycoside synergist, 0.9-2.3% pH buffer, 0.6-1.4% antioxidant plant essential oil, and the balance being deionized water.

[0007] Optionally, the plant polyphenol extract includes: grape seed extract, rosemary leaf extract, and green tea extract; the mass ratio of the grape seed extract, rosemary leaf extract, and green tea extract is 4:3:2.

[0008] Optionally, the fiber-affinity natural polymer is a modified cationic guar gum derivative, wherein the modified cationic guar gum derivative has excellent fabric adsorption properties and film-forming protective effect, and can form a dynamic protective layer during washing to effectively block dye leaching and cross-contamination.

[0009] Optionally, the cationic guar gum derivative has a degree of substitution of 0.75-0.85 and a charge density of 0.8–1.2 meq / g. Optionally, the natural anionic surfactant is sodium coconut oil fatty acid methyl ester sulfonate.

[0010] Optionally, the nonionic surfactant is isomeric tridecyl alcohol polyoxyethylene ether.

[0011] Optionally, the bio-based chelating agent is tetrasodium glutamate diacetate.

[0012] Optionally, the natural glycoside synergist is decyl maltose, which can self-assemble and encapsulate polyphenol molecules in plant polyphenol extracts through its amphiphilic structure, preventing the plant polyphenol extracts from agglomerating and precipitating, while reducing interfacial tension and enhancing wetting and penetration capabilities.

[0013] Optionally, the antioxidant plant essential oil is rosemary essential oil.

[0014] Optionally, the pH buffer includes citric acid and sodium citrate, which can adjust the pH of the laundry detergent system to 6.8-7.4.

[0015] Optionally, a color-protecting laundry detergent containing plant extracts comprises, by weight percentage: 15.6% natural anionic surfactant, 8.2% nonionic surfactant, 4.7% plant polyphenol extract, 4.1% fiber-affinity natural polymer, 3.3% bio-based chelating agent, 2.6% natural glycoside synergist, 1.7% pH buffer, 1.0% antioxidant plant essential oil, and deionized water to make up to 100%.

[0016] A second aspect of the present invention provides a method for preparing a color-protecting laundry detergent containing plant extracts, comprising the following steps: S1. Add deionized water to the reactor, and under stirring conditions, add natural anionic surfactant and nonionic surfactant in sequence, and pre-emulsify for 15-25 minutes; S2. Nitrogen is introduced into the reaction vessel from step S1 to remove oxygen, and the temperature is raised to 78-150℃; then, plant polyphenol extract and bio-based chelating agent are slowly added dropwise, with the addition time controlled at 40-60 minutes; after the addition is completed, the mixture is kept warm and matured for 1.5-2 hours, while maintaining a nitrogen atmosphere. S3. Adjust the temperature of the reactor in step S2 to 45-55℃, then add the natural glycoside synergist and pH buffer in sequence, and adjust the pH to 6.8-7.4; S4. Adjust the temperature of the reactor in step S3 to 38-45℃, then add antioxidant plant essential oil and fiber-friendly natural polymer in sequence, stir and mix evenly at low speed, and age for 1.0-1.8 hours to obtain the color-protecting laundry detergent product.

[0017] Optionally, the stirring speed during pre-emulsification in step S1 is 220-350 rpm.

[0018] Optionally, in step S2, during the process of adding plant polyphenol extract and bio-based chelating agent: the temperature is controlled at 85±2℃, the dropping rate is 0.8kg / min, and nitrogen protection is maintained throughout the process, with nitrogen purity ≥99.99%.

[0019] Optionally, in step S2, the cooling rate is controlled to be less than 2℃ / min after the heat preservation and curing stage is completed; the purpose is to avoid thermal stress causing system instability. Beneficial effects

[0020] 1. This application utilizes the combined action of natural surfactants and plant polyphenol extracts to significantly enhance color protection, addressing the problems of existing laundry detergents that damage clothing fibers, cause fading and discoloration after repeated washing, and accumulate chemical components. Furthermore, by adding biodegradable bio-based chelating agents to replace synthetic chemicals in existing laundry detergents, environmental compatibility is greatly improved. Simultaneously, the combined use of fiber-affinity natural polymers and natural glycoside synergists effectively reduces the deactivation rate of active ingredients, addressing issues of poor biodegradability, questionable safety, and difficulty in meeting the demands for green and healthy washing. The overall formula is safe. It is gentle and does not damage fabric dyes, making it suitable for a variety of fabric types. Specifically, it uses a cleaning system based on natural anionic and nonionic surfactants, and introduces plant polyphenol extracts as the main color-protecting factors. It is combined with bio-based chelating agents to inhibit the oxidation reaction of clothing dyes, and uses natural glycoside synergists to improve the aqueous dispersibility and antioxidant stability of plant polyphenol extracts. It forms a dynamic protective film on the surface of clothing through fiber-friendly natural polymers, blocking dye leaching and cross-contamination. It is also supplemented with antioxidant plant essential oils and near-pH buffers to ensure the chemical stability and biological safety of the overall system during storage and use.

[0021] 2. The plant polyphenol extracts include grape seed extract, rosemary leaf extract, and green tea extract. The combined use of these three extracts effectively protects the color of clothing. Specifically, grape seed extract proanthocyanidins strongly chelate metal ions in water, reducing dye oxidation and loss; green tea extract alleviates yellowing from sweat stains; and rosemary extract forms a protective film against UV fading. All three work together to protect clothing colors and reduce fiber damage. Furthermore, rosmarinic acid and catechins can cover various pathogenic bacteria, and combined with grape seed extract, they enhance stability, achieving broad-spectrum antibacterial and deodorizing effects. They also assist in removing metal ion and polyphenol stains, improving cleaning power. At the same time, these three extracts are natural and low-irritant, suitable for mothers, babies, and sensitive skin. They are easily biodegradable and more environmentally friendly, their natural fragrance provides a comfortable experience, and they maintain stable performance in various scenarios, adapting to various washing methods.

[0022] 3. By adding bio-based chelating agents, which can inhibit the dye oxidation reaction catalyzed by metal ions, pigment degradation is reduced from the source, and the color protection effect of the product is improved.

[0023] 4. By adding natural glycoside synergists, the amphiphilic structure of the natural glycoside synergists can self-assemble and encapsulate the polyphenol molecules of plant polyphenol extracts, preventing aggregation and precipitation, while reducing interfacial tension and enhancing wetting and penetration capabilities, thereby improving the aqueous dispersibility and antioxidant stability of plant polyphenol extracts and significantly extending the functional life of plant polyphenol extracts during storage and use.

[0024] 5. By adding fiber-affinity natural polymers, which can be quickly adsorbed on the surface of various fibers such as cotton and polyester to form a dynamic protective film, the product's color protection effect is improved and the color protection effect is made longer-lasting.

[0025] 6. The method for preparing a color-protecting laundry detergent containing plant extracts provided in this application effectively avoids the degradation of plant polyphenol extract components by combining temperature gradient control, inert gas protection, and staged feeding, thus ensuring the retention of the activity and synergistic effect of each functional component. Detailed Implementation

[0026] This invention provides a color-protecting laundry detergent containing plant extracts and its preparation method. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0027] Currently, most laundry detergents on the market rely on synthetic surfactants, color-protecting additives, and chemical auxiliaries to achieve good stain removal performance. However, chemical additives not only corrode and damage clothing fibers and colors, but also cause clothes to fade and change color after repeated washing. Furthermore, the accumulation of chemical components can cause gum problems. In addition, most existing color-protecting additives are synthetic organic compounds, which have poor biodegradability and questionable safety, making it difficult to meet the needs of green and healthy washing. The inventors have discovered that introducing plant polyphenol extracts as the main color-protecting factor can solve these drawbacks. Based on this, the purpose of this embodiment is to provide a color-protecting laundry detergent containing plant extracts. Through the combined action of natural surfactants and plant polyphenol extracts, the color-protecting effect can be significantly improved, solving the problems of existing laundry detergents damaging clothing fibers, causing fading and discoloration after repeated washing, and accumulating chemical components. Moreover, by adding biodegradable bio-based chelating agents to replace synthetic chemicals in existing laundry detergents, environmental compatibility is greatly improved. At the same time, the combined use of fiber-affinity natural polymers and natural glycoside synergists can effectively reduce the deactivation rate of active ingredients, solving the problems of poor biodegradability, questionable safety, and difficulty in meeting the needs of green and healthy washing. The overall formula is safe and gentle, does not damage fabric dyes, and is suitable for various fabric types.

[0028] Specifically, this invention provides a color-protecting laundry detergent containing plant extracts, comprising the following components by mass percentage: 12.5-18.3% natural anionic surfactant, 6.4-9.7% nonionic surfactant, 3.2-5.8% plant polyphenol extract, 3.0-5.2% fiber-affinity natural polymer, 2.1-4.0% bio-based chelating agent, 1.8-3.5% natural glycoside synergist, 0.9-2.3% pH buffer, 0.6-1.4% antioxidant plant essential oil, and the balance being deionized water.

[0029] In a preferred embodiment, the plant polyphenol extract includes: grape seed extract, rosemary leaf extract, and green tea extract; the mass ratio of the grape seed extract, rosemary leaf extract, and green tea extract is 4:3:2.

[0030] Among them, grape seed extract: Grape seed extract is a natural active substance obtained from grape (Vitis vinifera) seeds through solvent extraction and other processes. Because it is rich in various beneficial components, its application in laundry detergent has the following benefits: 1. Enhance color protection and fixation for clothing: Grape seed extract is rich in proanthocyanidins, which have excellent antioxidant stability. It can form a gentle protective film on the surface of clothing fibers, reducing the decomposition of dye molecules by detergents. It is especially effective for colored fabrics of natural fibers such as cotton and linen, delaying fading and color bleeding after washing and prolonging the color vibrancy of clothing.

[0031] 2. Enhance the antioxidant properties of clothing: Clothing exposed to air, sweat, or ultraviolet rays for extended periods is prone to oxidation and yellowing, especially white clothing and underwear. Proanthocyanidins can inhibit oxidation reactions, reduce yellowing and stiffening caused by fiber aging, and keep clothes soft after washing. They also reduce the potential irritation to the skin from oxidized substances when worn close to the skin.

[0032] 3. Assisted cleaning and gentle care for clothing: The natural active ingredients in grape seed extract can enhance the dispersing ability of surfactants, helping to break down stubborn stains such as sweat and oil on clothing. It is also gentle and can reduce damage to clothing fibers compared to traditional chemical additives, preventing clothes from pilling and deforming after washing. At the same time, it reduces the risk of residue and is more suitable for cleaning and caring for baby clothes and clothes for people with sensitive skin.

[0033] Rosemary leaf extract: Rosemary leaf extract is a natural active substance extracted from the dried leaves of *Rosmarinus officinalis* L., a plant belonging to the genus *Rosmarinus* of the Lamiaceae family, through processes such as water extraction, alcohol extraction, or supercritical fluid extraction. Its benefits in laundry detergents are as follows: 1. Natural antibacterial and deodorizing properties: Contains ingredients such as rosmarinic acid and caryophyllin, which can specifically inhibit harmful bacteria such as Staphylococcus aureus and Escherichia coli that grow on clothing due to sweat and dampness, reducing odor residue caused by bacterial decomposition. It is especially suitable for washing sportswear, underwear and other intimate clothing, keeping clothes fresh for a long time.

[0034] 2. It helps protect color and prevent aging. The antioxidant properties of the extract can slow down the yellowing and fading of clothing fibers due to oxidation during washing. It is suitable for common fabrics such as cotton, linen and chemical fibers, extending the life of clothing and allowing it to maintain its original color after multiple washes.

[0035] 3. Gentle and low-irritant: Compared to some chemical antibacterial ingredients, natural rosemary extract is less irritating to the skin and has a light plant fragrance. It can mask the odor of the washing ingredients without the need for additional fragrance, making it suitable for washing baby clothes and clothes for people with sensitive skin, balancing efficacy and safety.

[0036] Green tea extract: Green tea extract is a natural active substance extracted from the fresh tender leaves of the tea plant (Camellia sinensis L.), a plant belonging to the genus Camellia in the family Theaceae, through processes such as water extraction, alcohol extraction, or enzymatic hydrolysis. Its core advantage lies in its rich content of highly active antioxidants and its high safety profile. The benefits of using it in laundry detergent are as follows: 1. Powerful antibacterial and deodorizing properties: Its core ingredient, tea polyphenols, has a significant inhibitory effect on common pathogenic bacteria such as Escherichia coli and Staphylococcus aureus. It can deeply remove bacteria from clothes caused by sweat and dampness, reducing odor residue from the source. It is especially suitable for washing sportswear, underwear and other intimate clothing, leaving clothes naturally fresh after washing.

[0037] 2. Color protection and prevention of yellowing: The strong antioxidant properties of tea polyphenols can form a protective film on the surface of clothing fibers, reducing the oxidation and decomposition of dye molecules during washing and delaying the fading of fabrics such as cotton, linen, and chemical fibers; at the same time, it inhibits yellowing caused by fiber aging, making white clothes whiter and colored clothes brighter, and extending the wear life.

[0038] 3. Gentle and low-irritant: Compared to traditional chemical antibacterial agents, natural green tea extract is less irritating to the skin and has a light tea fragrance. It can mask the odor of the washing ingredients without the need for additional fragrance, making it suitable for cleaning the clothes of mothers and babies and people with sensitive skin, balancing cleaning power and safety.

[0039] In a preferred embodiment, the fiber-affinity natural polymer is a modified cationic guar gum derivative. The modified cationic guar gum derivative has excellent fabric adsorption properties and film-forming protective effect, and can form a dynamic protective layer during washing to effectively block dye leaching and cross-contamination.

[0040] Specifically, cationic guar gum derivatives are water-soluble polymers obtained by chemically modifying natural guar gum (introducing cationic groups). Due to their multiple functions, including fabric care, softening, and foam stabilization, they have become key functional ingredients in modern laundry detergents to enhance the washing and care experience, especially suitable for garment care and gentle cleaning needs. The application value of cationic guar gum derivatives in laundry detergents is as follows: 1. Naturally sourced, gentle and low-irritant: The raw material is derived from guar beans, a legume. After modification, it retains the gentle properties of natural polymers. The pH value is close to neutral, so it does not irritate the skin. It also has good biodegradability (degradation rate of over 80%) and will not leave residues in clothing or the environment. It is suitable for the care of baby clothes, clothes for people with sensitive skin, and delicate fabrics such as wool and silk.

[0041] 2. Strong adsorption and long-lasting softness and shape protection: The cationic groups in the molecular structure can tightly bind with negatively charged clothing fibers (such as cotton, linen, and synthetic fibers) to form a breathable protective film on the fiber surface. On the one hand, it reduces friction between fibers, prevents clothes from pilling and deforming after washing, and makes the clothes feel soft and fluffy after washing, without the need to add extra fabric softener. On the other hand, it can lock in the moisture of the fibers and alleviate the problem of static electricity in clothes in dry environments, making it especially suitable for use in autumn and winter.

[0042] 3. Synergistic effect of foam stabilization and cleaning aid: Although not the main surfactant, the high molecular structure of cationic guar gum derivatives can encapsulate the foam, delaying its collapse and allowing the laundry detergent to maintain a stable and fine foam during the washing process (avoiding too much or too little foam). This makes it easier to observe the cleaning progress and enhances the surfactant's ability to encapsulate stains, thus helping to improve cleaning efficiency. It is especially effective in adsorbing and removing dry stains such as dust and lint.

[0043] 4. Color protection and colorfastness, delaying clothing aging: The protective film on the fiber surface can isolate the dye molecules from the erosion of air and moisture, reducing the oxidation and loss of dyes during washing, and delaying the fading of colored clothes; at the same time, it prevents the structural aging of fibers caused by repeated washing, making white clothes less prone to yellowing and extending the life of clothing. In a preferred embodiment, the degree of substitution of the cationic guar gum derivative is 0.75-0.85, and the charge density is 0.8–1.2 meq / g.

[0044] In a preferred embodiment, the natural anionic surfactant is sodium coconut oil fatty acid methyl ester sulfonate.

[0045] Specifically, sodium coconut oil fatty acid methyl ester sulfonate (MES) is an anionic surfactant made from natural coconut oil through esterification, sulfonation, and neutralization processes. It is characterized by high cleaning power, strong environmental friendliness, and low irritation. The application value of sodium coconut oil fatty acid methyl ester sulfonate in laundry detergent is as follows: 1. Enhanced Cleaning Power: For everyday clothing oil stains (such as oil stains on cuffs and collars) and sweat stains, MES can quickly penetrate the fiber gaps, break down the stains into small molecules and wash them away with water. It is especially effective at removing hydrophilic stains (sweat stains, juice stains) compared to traditional ingredients.

[0046] 2. Protects clothes and colors: The gentle cleaning mechanism will not damage the structure of clothing fibers, reducing pilling and deformation after washing; at the same time, it has a weak adsorption force on dye molecules, which can reduce the risk of fading of colored clothes and allow clothes to maintain their original texture after multiple washes.

[0047] 3. Optimized user experience: The foam is fine and easy to rinse, reducing the number of rinses (usually 1-2 fewer than traditional laundry detergents), saving water resources; and the clothes feel soft after washing, eliminating the need for additional fabric softener, simplifying the washing and care process; due to its low-irritant properties, it can be used to wash delicate fabrics such as baby clothes, wool, and silk (requires the use of special conditioning ingredients), broadening the application range of laundry detergent and meeting the washing and care needs of the whole family.

[0048] In a preferred embodiment, the nonionic surfactant is isomeric tridecyl alcohol polyoxyethylene ether.

[0049] Specifically, isotrimethylene tridecyl alcohol polyoxyethylene ether is a nonionic surfactant. It is polymerized from isotrimethylene tridecyl alcohol and ethylene oxide through an addition reaction; the detailed molecular formula is shown below: H | H-(O-CH2-CH2) n -OC 13 H 27 | H The role of isomeric tridecyl alcohol polyoxyethylene ether in laundry detergent is as follows: 1. Powerful stain removal: Its branched structure allows it to penetrate the interface between oil stains and clothing fibers more easily than straight-chain alcohol ethers, rapidly emulsifying grease and effectively removing stains such as sebum and cooking oil from clothing. It also prevents stains from re-depositing onto clothing fibers through an "adsorption-emulsification-dispersion" mechanism.

[0050] 2. Low foam and easy to rinse: By selecting a model with a low ethylene oxide (EO) number, foam generation can be reduced, which is suitable for the washing machine's cyclic rinsing needs, while reducing rinsing energy consumption and water waste.

[0051] 3. Protects enzyme activity 2: Its non-ionic properties can protect the activity of enzymes in the laundry detergent, allowing the enzymes to function better and efficiently decompose protein stains such as blood stains and milk stains, even in low-temperature washing.

[0052] 4. Mild and low irritation: Isomerized tridecyl alcohol polyoxyethylene ether is mild and non-irritating, skin-friendly, and biodegradable, leaving no residue on clothing, making it suitable for washing underwear and baby clothes.

[0053] 5. Improved low-temperature performance: It has excellent low-temperature fluidity and can maintain stable performance in low-temperature environments, solving the problem of clumping of traditional surfactants in winter and ensuring that laundry detergent can be used normally in winter.

[0054] In a preferred embodiment, the bio-based chelating agent is tetrasodium glutamate diacetate.

[0055] In a preferred embodiment, the natural glycoside synergist is decyl maltose, which can self-assemble and encapsulate polyphenol molecules in plant polyphenol extracts through its amphiphilic structure, preventing the plant polyphenol extracts from agglomerating and precipitating, while reducing interfacial tension and enhancing wetting and penetration capabilities.

[0056] In a preferred embodiment, the antioxidant plant essential oil is rosemary essential oil.

[0057] In a preferred embodiment, the pH buffer includes citric acid and sodium citrate, which can adjust the pH of the laundry detergent system to 6.8-7.4.

[0058] In a preferred embodiment, a color-protecting laundry detergent containing plant extracts comprises, by weight percentage: 15.6% natural anionic surfactant, 8.2% nonionic surfactant, 4.7% plant polyphenol extract, 4.1% fiber-affinity natural polymer, 3.3% bio-based chelating agent, 2.6% natural glycoside synergist, 1.7% pH buffer, 1.0% antioxidant plant essential oil, and deionized water to make up to 100%.

[0059] A second aspect of the present invention provides a method for preparing a color-protecting laundry detergent containing plant extracts, comprising the following steps: S1. Add deionized water to the reactor, and under stirring conditions, add natural anionic surfactant and nonionic surfactant in sequence, and pre-emulsify for 15-25 minutes; S2. Nitrogen is introduced into the reaction vessel from step S1 to remove oxygen, and the temperature is raised to 78-150℃; then, plant polyphenol extract and bio-based chelating agent are slowly added dropwise, with the addition time controlled at 40-60 minutes; after the addition is completed, the mixture is kept warm and matured for 1.5-2 hours, while maintaining a nitrogen atmosphere. S3. Adjust the temperature of the reactor in step S2 to 45-55℃, then add the natural glycoside synergist and pH buffer in sequence, and adjust the pH to 6.8-7.4; S4. Adjust the temperature of the reactor in step S3 to 38-45℃, then add antioxidant plant essential oil and fiber-friendly natural polymer in sequence, stir and mix evenly at low speed, and age for 1.0-1.8 hours to obtain the color-protecting laundry detergent product.

[0060] In a preferred embodiment, the stirring speed during pre-emulsification in step S1 is 220-350 rpm.

[0061] In a preferred embodiment, during step S2, when adding the plant polyphenol extract and bio-based chelating agent, the temperature is controlled at 85±2℃, the dropping rate is 0.8kg / min, and nitrogen protection is maintained throughout the process, with nitrogen purity ≥99.99%.

[0062] In a preferred embodiment, in step S2, the cooling rate is controlled to be less than 2°C / min after the heat preservation and curing stage is completed; the purpose is to avoid thermal stress causing system instability. Example 1

[0063] This embodiment 1 provides a color-protecting laundry detergent containing plant extracts, and the components are as follows by mass percentage:

[0064] This embodiment 1 provides a method for preparing a color-protecting laundry detergent containing plant extracts, comprising the following steps: Step 1: Add 80 kg of deionized water to a stainless steel reactor equipped with a jacketed heating system and an anchor stirrer. Start the stirring device and set the speed to 280 rpm. Stir continuously at room temperature (25±2℃).

[0065] Step 2: Slowly add 15.6 kg of sodium coconut oil fatty acid methyl ester sulfonate and 8.2 kg of isomeric tridecyl alcohol polyoxyethylene ether in sequence, keeping the stirring rate constant, and carry out pre-emulsification for 20 minutes until the system presents a uniform, transparent microemulsion liquid with no obvious particles or stratification.

[0066] Step 3: Introduce high-purity nitrogen (purity ≥ 99.99%) into the reactor at a flow rate of 3 L / min and purge for 15 minutes to remove dissolved oxygen from the system. Then close the exhaust valve to maintain a positive pressure nitrogen atmosphere.

[0067] Step 4: Turn on the jacketed steam heating system to heat the material to 85°C. The heating rate should be controlled within 3°C / min to avoid local overheating that could cause surfactant precipitation.

[0068] Step 5: Prepare a mixed solution of plant polyphenol extract and tetrasodium glutamate diacetate: Dissolve 4.7 kg of plant polyphenol complex and 3.3 kg of tetrasodium glutamate diacetate in 10 kg of deionized water, and sonicate for 30 minutes (frequency 40 kHz) to obtain a clear brownish-yellow solution.

[0069] Step 6: Slowly add the above mixed solution dropwise into the main reactor using a constant pressure dropping funnel at a dropping rate of 0.8 kg / min. The dropping time should be controlled to be completed within 50 minutes, with continuous nitrogen protection during the process and the stirring speed maintained at 280 rpm.

[0070] Step 7: After the addition is complete, keep warm and mature for 1.8 hours at 85±2℃ to ensure that the plant polyphenol extract and tetrasodium diacetate are fully dispersed and form a micelle coating structure with the surfactant.

[0071] Step 8: After the curing process is complete, stop heating, turn on the cooling water circulation system, and cool the system down to 50°C. The cooling rate should be controlled within 2°C / min.

[0072] Step 9: Add 2.6 kg of decyl maltodextrin and the pre-prepared citrate / sodium citrate buffer (concentration 10%, amount corresponding to 1.7% of the total system), stirring while adding, and adjust the pH of the system to 7.0±0.1, using a precision pH meter for online monitoring.

[0073] Step 10: Continue cooling to 42°C, add 1.0 kg of rosemary essential oil and 4.1 kg of cationic guar gum derivative powder, adjust the stirring speed to 150 rpm, and mix at low speed for 1.2 hours to prevent high shear from damaging the polymer chain structure.

[0074] Step 11: Stop stirring, turn off the nitrogen gas, transfer the finished product to an aging tank, and let it stand and age for 1.5 hours under light-proof and room temperature conditions to further homogenize the components.

[0075] Step 12: After sampling and testing for appearance, pH, viscosity, active ingredient content and microbial indicators, the sample is filtered through a 0.45μm filter membrane and then filled to obtain the final product.

[0076] Example 2 The composition of the color-protecting laundry detergent containing plant extracts in Example 2 is the same as that in Example 1, only the parameters of the relevant preparation process are changed. The specific adjustments are as follows: 1. Change "the dripping time should be controlled within 50 minutes" in step six to "the dripping time should be controlled within 60 minutes".

[0077] 2. Change "keep warm and mature for 1.8 hours" in step seven to "keep warm and mature for 1.5 hours"; change "keep the temperature at 85±2℃" to "keep the temperature at 78±2℃".

[0078] The remaining operating steps are the same as in Example 1.

[0079] Example 3 The composition of the color-protecting laundry detergent containing plant extracts in Example 3 is the same as that in Example 1, except that the proportions of grape seed extract, rosemary leaf extract, and green tea extract in the plant polyphenol extracts are adjusted. Specifically: Grape seed extract: Rosemary leaf extract: Green tea extract = 3:4:3 (originally 4:3:2); The remaining operating steps are the same as in Example 1.

[0080] Comparative Example 1 Comparative Example 1 references a commonly used color-protecting laundry detergent, specifically a color-protecting laundry detergent formula, as shown below:

[0081] Comparative Example 2 provides a color-protecting laundry detergent containing plant extracts, and the components are as follows by mass percentage:

[0082] Comparative Example 3 provides a color-protecting laundry detergent containing plant extracts, and the components are as follows by mass percentage:

[0083] The color-protecting laundry detergent containing plant extracts in Comparative Example 4 is the same as that in Example 1, except that the following step in Example 1 is deleted: "Step 3: Introduce high-purity nitrogen (purity ≥99.99%) into the reaction vessel at a flow rate of 3 L / min and continue purging for 15 minutes to remove dissolved oxygen from the system, then close the exhaust valve to maintain a positive pressure nitrogen atmosphere."

[0084] Experimental Example 1 Experimental subjects: Laundry detergent products from Examples 1-3 and Comparative Examples 1-4; Experimental methods: The physicochemical properties of the laundry detergent products in Examples 1-3 and Comparative Examples 1-4 were tested; The experimental results are shown in Table 1 below:

[0085] Experimental Conclusions: The data above show that in Comparative Example 4, the color of the finished laundry detergent changed from light amber to dark brown; HPLC analysis revealed that the EGCG residue rate was only 63.5% of the initial level, and the proanthocyanidin degradation rate reached 31.2%; the DPPH free radical scavenging rate decreased from 91.2% to 72.4%; in the accelerated aging test, turbidity and odor appeared after one month of storage at 40℃. This demonstrates that nitrogen protection in the preparation process is crucial for maintaining the activity of plant extracts and is an essential technical feature.

[0086] Experiment Example 2 Experimental subjects: Laundry detergent products from Examples 1-3 and Comparative Examples 1-4; Experimental method: The color protection performance of the laundry detergent products in Examples 1-3 and Comparative Examples 1-3 was evaluated (ISO 105-C06 standard, ΔE value after 5 washes); where ΔE < 1.0 is imperceptible to the human eye; ΔE > 3.0 indicates obvious fading.

[0087] The experimental results are shown in Table 2 below: , Table 2 Experimental conclusion: The data above shows that in Comparative Examples 1-3, after 5 washes, the color difference of the blended fabrics is... ΔE is: {(3.27+3.26+3.50)÷3}=3.34, which is much higher than that of Example 1; indicating that the dual-effect mechanism of "stabilization enhancement + fiber anchoring" in this invention is indispensable.

[0088] Experimental Example 3 Experimental subjects: Laundry detergent products from Example 1 and Comparative Example 1 Experimental Methods: A cost-benefit analysis experiment was conducted on the laundry detergent products of Example 1 and Comparative Example 1. The experimental results are shown in Table 3 below: , Table 3 Experimental conclusion: Although the raw material cost of this invention is slightly higher, it has significant advantages in terms of environmental friendliness, stability and colorfastness, and has a higher overall cost performance, making it suitable for the high-end eco-friendly washing market.

[0089] In summary, this invention innovatively constructs a four-in-one color-protecting mechanism of "antioxidant-chelation-stabilization-anchoring" by scientifically combining natural plant extracts and functional bio-based adjuvants, achieving excellent anti-fading and anti-bleeding effects without relying on synthetic chemicals. The process employs nitrogen protection, gradient temperature control, and segmented feeding, effectively solving the technical bottleneck of easily inactivated plant active ingredients. Experimental data fully demonstrates that this invention has achieved unexpected technological advancements in color-protecting performance, storage stability, and environmental safety, possessing outstanding inventiveness and promising prospects for industrial application.

[0090] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A color-protecting laundry detergent containing plant extracts, characterized in that, By weight percentage, it comprises the following components: 12.5-18.3% natural anionic surfactants, 6.4-9.7% nonionic surfactants, 3.2-5.8% plant polyphenol extracts, 3.0-5.2% fiber-affinity natural polymers, 1.8-3.5% natural glycoside synergists, 2.1-4.0% bio-based chelating agents, 0.9-2.3% pH buffers, 0.6-1.4% antioxidant plant essential oils, and the balance being deionized water.

2. The color-protecting laundry detergent containing plant extracts according to claim 1, characterized in that, The plant polyphenol extract includes: grape seed extract, rosemary leaf extract, and green tea extract; the mass ratio of the grape seed extract, rosemary leaf extract, and green tea extract is 4:3:

2.

3. The color-protecting laundry detergent containing plant extracts according to claim 1, characterized in that, The fiber-affinity natural polymer is a modified cationic guar gum derivative.

4. The color-protecting laundry detergent containing plant extracts according to claim 1, characterized in that, The natural anionic surfactant is sodium coconut oil fatty acid methyl ester sulfonate.

5. The color-protecting laundry detergent containing plant extracts according to claim 1, characterized in that, The nonionic surfactant is isomeric tridecyl alcohol polyoxyethylene ether.

6. The color-protecting laundry detergent containing plant extracts according to claim 1, characterized in that, The bio-based chelating agent is tetrasodium glutamate diacetate.

7. The color-protecting laundry detergent containing plant extracts according to claim 1, characterized in that, The natural glycoside synergist is decyl maltose glycoside.

8. The color-protecting laundry detergent containing plant extracts according to claim 1, characterized in that, The antioxidant plant essential oil is rosemary essential oil.

9. A method for preparing a color-protecting laundry detergent containing plant extracts as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Add deionized water to the reactor, and under stirring conditions, add natural anionic surfactant and nonionic surfactant in sequence, and pre-emulsify for 15-25 minutes; S2. Nitrogen is introduced into the reaction vessel from step S1 to remove oxygen, and the temperature is raised to 78-150℃; then, plant polyphenol extract and bio-based chelating agent are slowly added dropwise, with the addition time controlled at 40-60 minutes; after the addition is completed, the mixture is kept warm and matured for 1.5-2 hours, while maintaining a nitrogen atmosphere. S3. Adjust the temperature of the reactor in step S2 to 45-55℃, then add the natural glycoside synergist and pH buffer in sequence, and adjust the pH to 6.8-7.4; S4. Adjust the temperature of the reactor in step S3 to 38-45℃, then add antioxidant plant essential oil and fiber-friendly natural polymer in sequence, stir and mix evenly at low speed, and age for 1.0-1.8 hours to obtain the color-protecting laundry detergent product.

10. The method for preparing the color-protecting laundry detergent containing plant extracts according to claim 9, characterized in that, The stirring speed during pre-emulsification in step S1 is 220-350 rpm.

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