Green preparation method of low-irritation laundry detergent

Abstract

The invention belongs to the technical field of laundry detergents, and discloses a green preparation method of a low-irritation laundry detergent. The method comprises the following steps: sequentially adding a humectant (1-5 wt% of glycerol and 1-5 wt% of 1, 3-propylene glycol), a thickener hydroxyethyl cellulose (0.1-0.35 wt%), a surfactant component (APG1214 5-15 wt%, sodium cocoyl glutamate 2-5 wt%, cocamidopropyl betaine 2-6 wt%, decyl glucoside 1-3 wt% and sophorolipid 0.5-1.5 wt%), a builder (2-5 wt% of sodium citrate and 0.3-0.8 wt% of GLDA), electrolyte sodium chloride (0.3-1.0 wt%) and preservatives (0.1-0.2 wt% of potassium sorbate and 0.2-0.3 wt% of sodium benzoate) into purified water; the pH is adjusted to 6.0-7.0, natural essential oil, a coloring agent and a defoaming agent can be selectively added, and water is supplemented to 100 wt%. According to the scheme, the process is simple and convenient, conditions are mild, and the product is low in skin irritation and stable in performance and has better renewability and degradability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of laundry liquid, and particularly relates to a green preparation method of low-irritation laundry liquid. BACKGROUND

[0002] Most of the commercially available laundry liquid products use petroleum-based surfactants, such as sodium dodecyl benzene sulfonate (LAS), sodium lauryl ether sulfate (SLES), etc. Although these surfactants have good detergency and foaming properties, they have the following disadvantages: first, when the surfactants remain on the textile fibers, they can easily cause skin irritation, especially for infants and sensitive groups, and can cause itching, dryness or allergic reactions; second, the above-mentioned surfactants have poor biodegradability, and remain in the natural environment for a long time, which has an adverse effect on the water and soil ecosystems; and third, the traditional preparation process often relies on high-temperature reaction, neutralization process or petrochemical raw materials, which has high energy consumption and does not conform to the green and sustainable development trend.

[0003] Therefore, how to develop a low-irritation, green and environmentally friendly, and stable laundry liquid preparation method has become a problem to be solved in the technical field of washing products. SUMMARY

[0004] To overcome the above technical problems, the application provides a green preparation method of low-irritation laundry liquid.

[0005] The application adopts the following technical scheme: A green preparation method of low-irritation laundry liquid comprises the following steps: adding purified water in a stirring container; adding a humectant to the purified water, the humectant comprising glycerol 1-5 wt% and / or 1,3-propanediol 1-5 wt%, and stirring uniformly; adding a thickening agent under stirring, the thickening agent being hydroxyethyl cellulose (HEC) with a dosage of 0.1-0.35 wt%, and continuing to stir until complete swelling; adding the following surfactant components in sequence: alkyl polyglycoside (APG1214) with a dosage of 5-15 wt%; sodium cocoyl glutamate with a dosage of 2-5 wt%; cocamidopropyl betaine with a dosage of 2-6 wt%; decyl glucoside with a dosage of 1-3 wt%; sophorolipid with a dosage of 0.5-1.5 wt%; adding a builder, including sodium citrate 2-5 wt% and glutamic acid diacetate (GLDA) 0.3-0.8 wt%; Add electrolyte sodium chloride, content is 0.3-1.0wt%, to adjust the viscosity of the system to 800-2000mPa·s; Add preservatives, including potassium sorbate 0.1-0.2wt% and sodium benzoate 0.2-0.3wt%; Adjust the pH value of the system to 6.0-7.0; Finally, add purified water to 100wt%, stir, defoam and filter to obtain the low irritation laundry liquid.

[0006] Preferably, the stirring speed is controlled at 180-280rpm, and the stirring temperature is 25-35℃, and each step of feeding needs to be stirred for 5-60min until uniform.

[0007] Preferably, the method for adjusting the viscosity of the system is to first dissolve sodium chloride in water to form a 10-20wt% solution, and then slowly drop it into the main system at a speed of 1-2mL / min.

[0008] Preferably, the viscosity grade of the hydroxyethyl cellulose is 200-300mPa·s (2% aqueous solution, 25℃).

[0009] Preferably, before adding water, 0.05-0.1wt% of essential oil, 0.002-0.005wt% of colorant and 0.03-0.05wt% of defoaming agent are added, and the essential oil is selected from lavender essential oil or lemon essential oil.

[0010] Preferably, the filtration step adopts a 0.45μm microporous filter membrane to remove insoluble substances and air bubbles.

[0011] Compared with the prior art, the present application has the following beneficial effects: The present application effectively reduces the potential irritation to the skin and eyes by selecting APG, amino acid surfactant and biological surfactant, etc. The product is suitable for infants and sensitive people to use; the surfactants and builders used are derived from natural renewable resources or biological fermentation products, have good biodegradability, and reduce environmental burden; the preparation method is operated under normal temperature conditions throughout the whole process, the stirring speed and time are easy to control, high energy consumption or complex reaction conditions are avoided, which is convenient for laboratory test and also beneficial to industrial production.

[0012] The product has the same detergency and foam performance as traditional SLES / LAS laundry liquid, and the viscosity and appearance are stable. DETAILED DESCRIPTION

[0013] The examples of the present application are described in detail below, and unless otherwise specified, the raw materials and equipment used are commercially available or commonly used in the art. The methods used in the examples are conventional methods in the art, unless otherwise specified. The examples described below are illustrative only and are not intended to limit the present application.

[0014] Example 1 Formulation (w / w %): Alkyl polyglycoside (APG1214): 5.0% Sodium cocoyl glutamate: 2.0% Cocamidopropyl betaine: 2.0% Decyl glucoside: 1.0% Sophorolipid: 0.5% Sodium citrate: 2.0% Glutamic acid diacetate (GLDA): 0.3% Glycerol: 1.0% 1,3-Propanediol: 1.0% Hydroxyethyl cellulose (HEC, 200-300 mPa-s): 0.15% Sodium chloride: 0.3% Potassium sorbate: 0.1% Sodium benzoate: 0.2% Citric acid: 0.1% Purified water.

[0015] Procedure: About 600 g of purified water was added to a 1000 mL glass stirred tank; 10 g of glycerol and 10 g of 1,3-propanediol were added, and the stirrer was set to 200 rpm, and stirred for 5 min to completely dissolve; 1.5 g of HEC powder was slowly dispersed under stirring, and stirring was maintained for 30 min to completely swell and form a transparent solution; 50 g of APG1214, 20 g of sodium cocoyl glutamate, 20 g of cocamidopropyl betaine, 10 g of decyl glucoside, and 5 g of sophorolipid were sequentially added, the stirring speed was increased to 250 rpm, and stirring was maintained for 20 min until it was clear; 20 g of sodium citrate and 3 g of GLDA were dissolved and added to the solution, and stirring was maintained for 5 min; 3 g of NaCl was dissolved in 20 g of purified water, and was slowly added dropwise to the system while measuring the viscosity, until the viscosity was about 850 mPa-s; 1 g of potassium sorbate and 2 g of sodium benzoate were added and stirred until uniform; The pH was adjusted to 6.3 with 1 g of citric acid solution; Make up the volume to 1000g with purified water, stir for 10 minutes, let stand to remove bubbles, and filter (0.45μm filter membrane) to obtain the finished product.

[0016] Example 2 Formula (w / w%): APG1214: 10.0% Sodium cocoyl glutamate: 3.5% Cocamidopropyl betaine: 4.0% Decyl glucoside: 2.0% Sophorolipids: 1.0% Sodium citrate: 3.5% GLDA: 0.5% Glycerin: 3.0% 1,3-Propanediol: 3.0% HEC: 0.25% NaCl: 0.6% Potassium sorbate: 0.15% Sodium benzoate: 0.25% Citric acid: 0.2% Lavender essential oil: 0.05% Colorant: 0.002% Defoamer (silicone type): 0.03% Purified water: Bring to 100% Operating steps: Add 1200g of purified water to a 2000mL glass reactor and stir at 180rpm. Add 30g of glycerin and 30g of 1,3-propanediol in sequence, and stir well; Slowly disperse 5g of HEC and stir for 40 minutes until fully swollen; Add 100g APG1214, 35g sodium cocoyl glutamate, 40g cocamidopropyl betaine, 20g decyl glucoside, and 10g sophorolipid in sequence, and increase the stirring speed to 250 rpm and keep it for 25 minutes. Add 35g sodium citrate and 5g GLDA, and stir for 10 minutes until dissolved; Dissolve 6g of NaCl in 30g of water, adding it dropwise while stirring, and observe the viscosity. The target value is 1250mPa·s. Add 1.5g potassium sorbate and 2.5g sodium benzoate; Adjust the pH to 6.4 (citric acid solution, 10% w / w); Add 0.5g lavender essential oil, 0.02g food-grade blue coloring agent, and 0.3g defoamer, and stir gently for 5 minutes; Make up the volume to 2000g with purified water, filter and remove bubbles to obtain a clear finished product.

[0017] Example 3 Formula (w / w%): APG1214: 15.0% Sodium cocoyl glutamate: 5.0% Cocamidopropyl betaine: 6.0% Decyl glucoside: 3.0% Sophorolipids: 1.5% Sodium citrate: 5.0% GLDA: 0.8% Glycerin: 5.0% 1,3-Propanediol: 5.0% HEC: 0.35% NaCl: 1.0% Potassium sorbate: 0.2% Sodium benzoate: 0.3% Citric acid: 0.3% Lemon essential oil: 0.1% Colorant: 0.005% Defoamer: 0.05% Purified water: Bring to 100% Operating steps: Add 3000g of purified water to a 5000mL double-walled glass autoclave, set the jacket temperature to 30℃, and the stirrer speed to 200rpm. Add 150g glycerin and 150g 1,3-propanediol, and stir for 10 minutes; Slowly and evenly sprinkle in 17.5g of HEC powder, controlling the feeding rate to ≤0.5g / min to prevent clumping, and maintain stirring for 60min to obtain a high-viscosity transparent liquid; Add 750g APG1214, 250g sodium cocoyl glutamate, 300g cocamidopropyl betaine, 150g decyl glucoside, and 75g sophorolipid in sequence, and increase the stirring speed to 280 rpm and keep it for 30 minutes. Add 250g sodium citrate and 40g GLDA, and stir for 15 minutes; Dissolve 50g NaCl in 200g water, add slowly dropwise, and adjust the viscosity of the system to about 1900mPa·s; Add 10g potassium sorbate and 15g sodium benzoate, and stir well; Adjust the pH to 6.5 using a 10% citric acid solution; Add 5g lemon essential oil, 0.5g food-grade yellow coloring agent, and 5g silicone defoamer, and stir gently for 5 minutes; Add water to 5000g, stir for 15 minutes, defoam and filter to obtain a slightly emulsified finished laundry detergent.

[0018] Comparative Example Formula (w / w%) Sodium lauryl ether sulfate (SLES): 17.1% Linear alkylbenzene sulfonic acid (LABSA): 5.2% Cocamidopropyl betaine (CAPB): 8.6% Trisodium citric acid: 3.5% Disodium EDTA-2Na: 0.3% (used as a chelating agent in the control, distinct from the GLDA of this invention) Glycerin: 3.0% 1,3-Propanediol: 3.0% Hydroxyethyl cellulose (HEC): 0.25% Sodium chloride: 0.60% Potassium sorbate: 0.15%; Sodium benzoate: 0.25% Citric acid (adjust pH to 6.4): 0.20% Fragrance (lavender): 0.05%; Colorant: 0.002%; Defoamer: 0.03% Purified water.

[0019] Preparation steps: Take about 60% purified water, add glycerol and 1,3-propanediol (3.0% each), and stir at 180 rpm for 5 min.

[0020] Slowly disperse 0.25% HEC and stir for 40 minutes until fully swollen.

[0021] Prepare a separate neutralization solution: Add 5.2% LABSA to a 10% NaOH solution (temperature controlled in an ice-water bath ≤35℃) and adjust to pH 6.5-7.0 to obtain LABS premix.

[0022] Add SLES (17.1%), LAS premix, and CAPB (8.6%) to the main reactor in sequence, and stir at 240-260 rpm for 25 minutes.

[0023] Add 3.5% trisodium citric acid and 0.3% EDTA-2Na, and stir for 10 minutes.

[0024] Dissolve NaCl (0.6%) and add it slowly dropwise, with a target viscosity of approximately 1200-1300 mPa·s.

[0025] Add preservatives, adjust the pH to 6.4 with citric acid, and add flavorings, colorings, and defoamers.

[0026] Add water to 100%, run at low speed for 10 minutes, let stand to remove bubbles, filter at 0.45μm to obtain the control sample.

[0027] Sample testing: Standardized Test Conditions Preparation concentration: The finished laundry detergent contains approximately 20% total active ingredients.

[0028] Test conditions: 25℃±2℃, hardness 100ppm (calculated as CaCO3), liquid ratio 1:30.

[0029] Instruments and methods: pH: pH electrode (25℃); Viscosity: Brookfield RV, Sp#3, 20 rpm; Surface tension: DuNoüy tensiometer, 25℃, 1% solution; Centrifugation stability: Stable if no stratification occurs after 4000 rpm × 30 min; Stain removal rate: AATCC standard sebum-stained cloth, reflectivity improvement calculation, n=3, mean value; Irritation: 24-hour patch (diluted 5%, n=20, erythema score 0-3); Corrosion: Stainless steel sheet, 40℃×24h, mass loss mg / cm²; Biodegradation rate: Performed according to OECD 301F (respiratory assay), the COD removal rate (%) within 28 days was measured, and a removal rate ≥60% within 28 days was considered biodegradable.

[0030] The test results are shown in Table 1.

[0031] Table 1 in conclusion: The stain removal rates of the three embodiments of the present invention (76.9-79.5%) are comparable to those of the comparative example (79.3%), indicating that the same cleaning power can be achieved even without using SLES / LAS.

[0032] The patch test score was only 0.2-0.3, far lower than the control group's 0.8, indicating a significant reduction in skin irritation.

[0033] The corrosion loss to stainless steel is ≤0.21mg / cm², which is only about 1 / 3 of the comparative example of 0.6mg / cm², indicating that it is gentler on household appliances.

[0034] The surface tension is about 2 mN / m lower than that of the control group, which is beneficial for wetting and decontamination; it has good centrifugal stability and storage stability.

[0035] The biodegradation rate within 28 days was greater than 87%, which is far higher than the OECD 301F qualification standard.

[0036] In summary, while ensuring detergency, this invention outperforms traditional SLES / LAS laundry detergents in terms of low irritation, low corrosion, stability, and surface properties, and also has better renewability and biodegradability.

[0037] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to the above embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A green preparation method for a low-irritation laundry detergent, characterized in that, Includes the following steps: Add purified water to the mixing container; Add a humectant to the purified water, the humectant comprising 1-5 wt% glycerin and / or 1-5 wt% 1,3-propanediol, and stir until homogeneous; Add a thickener, namely hydroxyethyl cellulose (HEC), at a dosage of 0.1-0.35 wt%, while stirring, and continue stirring until fully swollen; The following surfactant components were added sequentially: Alkyl polysaccharide glycoside (APG1214), dosage: 5-15 wt%; Sodium cocoyl glutamate, dosage: 2-5 wt%; Cocamidopropyl betaine, used at a dosage of 2-6 wt%; Decyl glucoside, dosage 1-3 wt%; Sophorolipids, used at a dosage of 0.5-1.5 wt%; Add detergent builders, including 2-5 wt% sodium citrate and 0.3-0.8 wt% glutamate diacetate (GLDA); Add sodium chloride electrolyte at a content of 0.3-1.0 wt% to adjust the viscosity of the system to 800-2000 mPa·s; Preservatives are added, including 0.1-0.2 wt% potassium sorbate and 0.2-0.3 wt% sodium benzoate; Adjust the pH of the system to 6.0-7.0; Finally, add purified water to 100 wt%, stir, defoam, and filter to obtain the low-irritation laundry detergent.

2. A green preparation method for a low-irritation laundry detergent according to claim 1, characterized in that, The stirring speed should be controlled at 180-280 rpm, the stirring temperature at 25-35℃, and the mixture should be stirred for 5-60 minutes after each feeding until it is uniform.

3. A green preparation method for a low-irritation laundry detergent according to claim 1, characterized in that, The method for adjusting the viscosity of the system is as follows: first, dissolve sodium chloride in water to form a 10-20 wt% solution, and then slowly add it dropwise to the main system at a rate of 1-2 mL / min.

4. A green preparation method for a low-irritation laundry detergent according to claim 1, characterized in that, The viscosity grade of the hydroxyethyl cellulose is 200-300 mPa·s (2% aqueous solution, 25°C).

5. A green preparation method for a low-irritation laundry detergent according to claim 1, characterized in that, Before moisturizing, add 0.05-0.1 wt% of essential oil, 0.002-0.005 wt% of colorant, and 0.03-0.05 wt% of defoamer. The essential oil is selected from lavender essential oil or lemon essential oil.

6. A green preparation method for a low-irritation laundry detergent according to claim 1, characterized in that, The filtration step uses a 0.45μm microporous membrane to remove insoluble matter and air bubbles.

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