Preparation method of hydrophilic soft silicone oil emulsion with high alkali-resistant and anion-resistant stability

Abstract

The invention relates to the technical field of amino silicone oil emulsion, in particular to hydrophilic soft silicone oil emulsion with high alkali resistance and anion-resistant stability and a preparation method of the hydrophilic soft silicone oil emulsion. The silicone oil is prepared by emulsifying the following raw materials: quaternary ammonium salt-EO / PO polyether dual-modified hydrophilic soft block silicone oil, cross-linked polyether silicone oil, a nonionic surfactant XL70, a zwitterionic surfactant lauramide propyl hydroxy sulfobetaine, citric acid, a pH regulator sodium citrate, deionized water and the like. The cross-linked polyether silicone oil inherits amphipathy of polyether silicone oil and can effectively reduce surface tension, and the cross-linked network structure of the cross-linked polyether silicone oil enhances anchoring capability of molecules on an interface. The nonionic surfactant XL70 promotes and strengthens an interfacial film mechanism, forms a thick adsorption layer and reduces anion permeation; and lauramide propyl hydroxysulfobetaine has specific tenderness, so that the irritation of an anion system can be remarkably reduced, and the lauramide propyl hydroxysulfobetaine and XL70 form a synergistic effect to jointly improve the anion-resistant stability.

Description

Technical Field

[0001] The invention relates to the technical field of amino silicone oil emulsions, in particular to a hydrophilic soft silicone oil emulsion with high alkali resistance and anion resistance stability and a preparation method thereof. Background Art

[0002] As a commonly used textile auxiliary agent, organosilicon hydrophilic softeners have good softness and hydrophilicity and are widely used in the textile industry. However, traditional organosilicon softeners have poor alkali resistance and poor anion resistance, and are easily affected by various chemical substances. Particularly during the dyeing process, residual dyes and substances such as alkali, salt, and anions can damage the softener, affecting its finishing effect. Patent CN117903456A discloses a superstable network structure quaternary ammonium modified silicone oil emulsion and its preparation method. This invention obtains a network structure quaternary ammonium modified silicone oil by ring-opening polymerization of a ternary quaternary ammonium salt composition and a double-ended epoxy silicone oil, and then compounding it with components such as conventional nonionic emulsifiers, special nonionic emulsifiers, and glacial acetic acid to prepare a silicone oil emulsion with excellent stability. However, this invention still has the problem of formula optimization of the ternary quaternary ammonium salt composition. Although the high temperature stability and alkali stability of the silicone oil emulsion are improved, its anion stability is poor in a complex same-bath dyeing system. Residual dyes and anions and other substances in the dyeing process will destroy the softener and affect its finishing effect.

[0003] Furthermore, existing silicone softener preparation methods are often complex, involving multi-step chemical reactions and potentially introducing hazardous substances during the preparation process. Furthermore, traditional softeners often require high temperatures when treating fabrics, which not only increases production costs but can also adversely affect fabric quality. Furthermore, while traditional emulsification methods, such as mechanical emulsification and monomer emulsion polymerization, have improved the dispersion stability of silicone oils to a certain extent, they still pose challenges such as high emulsifier usage, high costs, and environmental pollution.

[0004] Therefore, developing a method for preparing an ultra-stable, hydrophilic, and soft silicone oil emulsion that maintains the excellent softness of silicone oil and imparts excellent hydrophilicity to fabrics while also addressing its storage stability and environmental friendliness has become a pressing technical challenge in the field of textile auxiliaries. This new silicone oil emulsion must not only possess excellent stability, including resistance to high temperatures, acids and alkalis, anions, and shear, but also be environmentally friendly and economical to meet the ever-increasing demands of the modern textile industry. Summary of the Invention

[0005] Prior art silicone oil hydrophilic softeners suffer from poor alkali resistance, poor anion resistance, poor high-temperature storage stability, and easy demulsification. To address these issues, the present invention provides a hydrophilic softening silicone oil emulsion with high alkali resistance and anion resistance stability, and a preparation method thereof.

[0006] The technical solution of the present invention is as follows: a hydrophilic soft silicone oil emulsion with high alkali resistance and anion resistance stability is composed of the following raw materials in percentage by weight: 25-30% of quaternary ammonium salt-EO / PO polyether double-modified hydrophilic soft block silicone oil, 5-10% of cross-linked polyether silicone oil, 3-5% of nonionic surfactant, 0.5-1.5% of special zwitterionic surfactant, 0.1-0.5% of organic acid, 0.5-1% of pH regulator, and the balance is deionized water.

[0007] The block silicone oil used in the present invention can be a commercially available block silicone oil. Preferably, the block silicone oil is KA-BS6038-QSR, a commercially available silicone oil from Xingrui Silicone Materials Co., Ltd., which is a hydrophilic, soft block silicone oil modified with a quaternary ammonium salt-EO / PO polyether, with a viscosity of 2000-2500 mPa.s and a solid content of 85±1%.

[0008] The linear polyether silicone oil used in the present invention is the commercially available polyether silicone oil KPE-306A. Preferably, the cross-linked polyether silicone oil is obtained by adding a side chain hydrogen silicone oil with a molecular weight of 2000-5000 to hydroxy polyethylene glycol methacrylate. The structural formula of the cross-linked polyether silicone oil is:

[0009] Wherein the R1 and R2 segments are: -CH2CH2-C(CH3)C(O)O-(CH2CH2O)nH, and m and n are integers between 20 and 50.

[0010] The preparation method is to add side-chain hydrogenated silicone oil and hydroxy polyethylene glycol methacrylate to a container equipped with a stirrer, a thermometer, a reflux condenser, and nitrogen / inert gas protection, with the addition ratio being 2.02:1. Under nitrogen protection, the temperature is raised to 70-80°C with stirring, and a precisely measured amount of platinum catalyst solution is added. The mixture is then kept at 85-90°C for 5-8 hours to obtain a cross-linked polyether silicone oil.

[0011] Preferably, the nonionic surfactant isomer C 10 Alcohol ether XL70 series. The nonionic surfactant of this solution is preferably used, which has a stable HLB value, a narrow polyether distribution, and molecular uniformity to reduce demulsification weaknesses.

[0012] Preferably, the special zwitterionic surfactant is lauramidopropyl hydroxysulfobetaine.

[0013] Preferably, the organic acid is one or a mixture of glacial acetic acid, lauric acid, and citric acid.

[0014] Preferably, the pH adjuster is one or a mixture of acetic acid / sodium acetate, citric acid / sodium citrate, boric acid-triethanolamine. Preferably, the anion in the resistant anion includes one or a mixture of sodium lauryl sulfate, sodium lauryl sulfonate, sodium laureth sulfate, and sodium stearate.

[0015] The anion in the anion resistance test is sodium lauryl sulfate.

[0016] The present invention further provides a method for preparing a hydrophilic soft silicone oil emulsion with high alkali resistance and anion stability based on the above formula, comprising the following steps: S1, mixing block silicone oil, polyether silicone oil, nonionic surfactant, zwitterionic surfactant, and organic acid to obtain a mixture; S2, homogenize the mixture of S1, add water, and homogenize again to convert the mixture from a water-in-oil emulsion to an oil-in-water emulsion; S4. Add water and pH adjuster to the oil-in-water emulsion in S2, stir, and filter to obtain a hydrophilic soft silicone oil emulsion with high alkali resistance and anion resistance stability.

[0017] In the step S2, the speed is set to 2000 rpm-2500 rpm during the homogenization process, and the stirring mixing is 60s-120s.

[0018] In the step S3, the speed is set to 3500 rpm-4500 rpm during the homogenization process, and the stirring mixing is 60s-120s.

[0019] The advantages are: The quaternary ammonium salt-EO / PO polyether dual-modified hydrophilic soft block silicone oil used in this invention has a unique quaternary ammonium salt structure. Its alkalinity is lower than that of primary and secondary amino silicone oils, making it highly resistant to alkali damage or decomposition. This significantly improves the high-temperature alkali stability of silicone oil emulsions. Furthermore, the introduction of the hydrophilic polyether segment improves the hydrophilic-hydrophobic balance, imparting excellent hydrophilic properties to the finished fabric without compromising its softness.

[0020] The present invention introduces cross-linked polyether silicone oil in the emulsion preparation process, which is obtained by adding side chain hydrogen silicone oil to hydroxy polyethylene glycol methacrylate. Cross-linked polyether silicone oil inherits the amphiphilicity (hydrophilic and lipophilic) of polyether silicone oil and can effectively reduce surface tension. The terminal hydroxyl groups of the polyether side chain can participate in esterification or self-condensation cross-linking reactions to form a cross-linked network structure. The unconsumed terminal hydroxyl groups can also provide anchoring points for subsequent modifications. At the same time, the cross-linked network structure formed enhances the anchoring ability of the molecules on the interface and can promote the stability of the emulsion. The organic acid is citric acid with strong alkali resistance and triple buffering, which is used in combination with pH regulator sodium citrate to maintain pH stability and improve alkali resistance stability. The surfactant is a non-ionic surfactant isomerized C 10 The alcohol ether XL70 series has a stable HLB value and a narrow polyether distribution, which promotes the strengthening of the interfacial film mechanism, forms a thick adsorption layer, and reduces anion penetration. At the same time, it introduces the amide structure-modified zwitterionic surfactant lauramidopropyl hydroxysulfobetaine. Its unique mildness can significantly reduce the irritation of the anion system, forming a synergistic effect with XL70 to jointly improve the anion resistance stability.

[0021] The above-mentioned hydrophilic soft silicone oil emulsion with high alkali resistance and anion resistance stability and its preparation method include the following steps: S1. Weigh all the quaternary ammonium salt-EO / PO polyether double-modified hydrophilic soft block silicone oil, cross-linked polyether silicone oil, nonionic surfactant, special zwitterionic surfactant and organic acid according to mass percentage and add them into the emulsification cup in sequence; S2. Fix the emulsifying cup under the high shear homogenizer, set the speed to 2000 rpm, and stir and mix for 60 seconds; S3. Add deionized water (10% of the total water volume) to the emulsifying cup, set the speed to 2500 rpm, and stir for 120 seconds. Repeat 3-4 times. When the mixture in the cup changes from a water-in-oil emulsion to an oil-in-water emulsion, scrape the wall of the emulsifying cup to ensure uniform mixing. S4. Add the remaining ionized water and pH adjuster to the emulsification cup, set the speed to 3500 rpm, and mix for 120 seconds; S5, filtering to obtain a blue light transparent, highly alkali-resistant, anion-resistant, stable, hydrophilic, soft silicone oil emulsion; Beneficial effects In summary, this application includes at least one of the following beneficial technical effects: 1. The silicone oil emulsion of the present invention has excellent high temperature resistance and can remain stable in high temperature environments without decomposition or performance degradation, thus meeting the processing requirements of the modern textile industry for high temperature environments; 2. The silicone oil emulsion of the present invention has good alkali resistance and can remain stable in alkaline environments. It is suitable for a wider range of industrial applications and is particularly suitable for textile processing that needs to be used in harsh environments. 3. The silicone oil emulsion of the present invention has excellent anion resistance and can effectively resist the influence of anions, maintain its stability and performance, and solve the problem that traditional silicone oil emulsions are easily deactivated in anionic environments. DETAILED DESCRIPTION

[0022] The following will be combined with specific embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Example 1 The hydrophilic, soft silicone oil emulsion of this embodiment with high alkali resistance and anion stability is composed of the following raw materials in percentage by weight: 25% quaternary ammonium salt-EO / PO polyether dual-modified hydrophilic, soft block silicone oil, 10% cross-linked polyether modified silicone oil, 3% nonionic surfactant XL70, 0.5% zwitterionic surfactant lauramidopropyl hydroxysulfobetaine, 0.1% organic acid citric acid, 0.5% pH adjuster citric acid / sodium citrate, and the balance deionized water.

[0024] The preparation method of the amino silicone oil emulsion of the present embodiment is as follows: S1. Weigh all the quaternary ammonium salt-EO / PO polyether double-modified hydrophilic soft block silicone oil, cross-linked polyether silicone oil, nonionic surfactant, zwitterionic surfactant and organic acid according to the mass ratio and add them into the emulsification cup in sequence; S2. Fix the emulsifying cup under the high shear homogenizer, set the speed to 2000 rpm, and stir and mix for 60 seconds; S3. Add deionized water (10% of the total water volume) to the emulsifying cup, set the speed to 2500 rpm, and stir for 120 seconds. Repeat 3-4 times. When the mixture in the cup changes from a water-in-oil emulsion to an oil-in-water emulsion, scrape the wall of the emulsifying cup to ensure uniform mixing. S4. Add the remaining ionized water and pH adjuster to the emulsification cup, set the speed to 3500 rpm, and mix for 120 seconds; S5. Filter to obtain a blue light transparent, highly alkali-resistant, anion-resistant and stable hydrophilic soft silicone oil emulsion.

[0025] In step S3, the temperature of the deionized water is 25° C., and the amount of deionized water added each time is 10% of the total mass of the water.

[0026] In step S5, the solid content of the hydrophilic soft silicone oil emulsion with high alkali resistance and anion stability is 30%.

[0027] Example 2 This embodiment provides a highly alkali-resistant, anion-stable, hydrophilic, soft silicone oil emulsion composed of the following raw materials by weight: 26% quaternary ammonium salt-EO / PO polyether dual-modified hydrophilic soft block silicone oil, 9% cross-linked polyether-modified silicone oil, 3.5% nonionic surfactant XL70, 0.75% zwitterionic surfactant lauramidopropyl hydroxysulfobetaine, 0.2% citric acid, 0.6% pH adjuster citric acid / sodium citrate, and the balance deionized water. Its preparation method is the same as in Example 1.

[0028] Example 3 The hydrophilic, soft silicone oil emulsion of this embodiment, which is highly alkali-resistant and anion-stable, is composed of the following raw materials in percentage by weight: 27% quaternary ammonium salt-EO / PO polyether dual-modified hydrophilic, soft block silicone oil, 8% cross-linked polyether-modified silicone oil, 4% nonionic surfactant XL70, 1% zwitterionic surfactant lauramidopropyl hydroxysulfobetaine, 0.3% citric acid, 0.7% pH adjuster citric acid / sodium citrate, and the balance deionized water. Its preparation method is the same as in Example 1.

[0029] Example 4 The hydrophilic, soft silicone oil emulsion of this embodiment, which is highly alkali-resistant and anion-stable, is composed of the following raw materials in percentage by weight: 28% quaternary ammonium salt-EO / PO polyether dual-modified hydrophilic, soft block silicone oil, 7% cross-linked polyether-modified silicone oil, 4.5% nonionic surfactant XL70, 1.25% zwitterionic surfactant lauramidopropyl hydroxysulfobetaine, 0.4% citric acid, 0.8% pH adjuster citric acid / sodium citrate, and the balance deionized water. Its preparation method is the same as in Example 1.

[0030] Example 5 The hydrophilic, soft silicone oil emulsion of this embodiment, which is highly alkali-resistant and anion-stable, is composed of the following raw materials in percentage by weight: 30% quaternary ammonium salt-EO / PO polyether dual-modified hydrophilic, soft block silicone oil, 5% cross-linked polyether-modified silicone oil, 5% XL70 nonionic surfactant, 1.5% zwitterionic surfactant lauramidopropyl hydroxysulfobetaine, 0.5% citric acid, 1% pH adjuster citric acid / sodium citrate, and the balance deionized water. Its preparation method is the same as in Example 1.

[0031] Comparative Example 1 Based on Example 1, this comparative example presents a highly alkali-resistant, anion-stable, hydrophilic, and soft silicone oil emulsion composed of the following raw materials in percentage by weight: 30% quaternary ammonium salt-EO / PO polyether dual-modified hydrophilic, soft segmented silicone oil; 5% nonionic surfactant XL70; 1.5% zwitterionic surfactant lauramidopropyl hydroxysulfobetaine; 0.5% citric acid; 1% pH adjuster citric acid / sodium citrate; and the balance deionized water. The preparation method is the same as in Example 1.

[0032] Comparative Example 2 Based on Example 1, this comparative example presents a highly alkali-resistant, anion-stable, hydrophilic, and soft silicone oil emulsion composed of the following raw materials (by weight percentage): 27% quaternary ammonium salt-EO / PO polyether dual-modified hydrophilic soft block silicone oil, 8% linear polyether-modified silicone oil (commercially available polyether silicone oil KPE-306A), 4% nonionic surfactant XL70, 1% zwitterionic surfactant lauramidopropyl hydroxysulfobetaine, 0.3% citric acid, 0.7% pH adjuster citric acid / sodium citrate, and the balance deionized water. The preparation method is the same as in Example 1.

[0033] Comparative Example 3 Based on Example 1, a highly alkali-resistant, anion-resistant, and stable hydrophilic soft silicone oil emulsion of this comparative example is composed of the following raw materials in percentage by mass: 27% of quaternary ammonium salt-EO / PO polyether double-modified hydrophilic soft block silicone oil, 8% of cross-linked polyether modified silicone oil, and 8% of nonionic surfactant isomerized C 13 4% of alcohol ether 1303 series, 1% of zwitterionic surfactant lauramidopropyl hydroxysulfobetaine, 0.3% of citric acid, 0.7% of pH adjuster citric acid / sodium citrate, and the balance of deionized water. The preparation method is the same as that of Example 1.

[0034] Comparative Example 4 Based on Example 1, this comparative example presents a highly alkali-resistant, anion-stable, hydrophilic, and soft silicone oil emulsion composed of the following raw materials in percentage by weight: 27% quaternary ammonium salt-EO / PO polyether dual-modified hydrophilic soft block silicone oil, 8% cross-linked polyether-modified silicone oil, 4% nonionic surfactant XL70, 0.3% citric acid, 0.7% pH adjuster citric acid / sodium citrate, and the balance deionized water. The preparation method is the same as in Example 1.

[0035] Fabric finishing process Fabric used: 100% cotton white double-knit fabric.

[0036] Fabric finishing process: Padding working fluid (20g / L of hydrophilic soft silicone oil emulsion with high alkali resistance and anion stability, one dip, one pad, one dip, one pad (pad rate 65-100%)), baking at 150℃*90s. After baking, fully recover moisture in a constant temperature and humidity chamber at 25℃ and 60% humidity for at least 2 hours.

[0037] Application performance testing Hydrophilic performance evaluation Evaluation of hydrophilic properties: Spread the fabric horizontally, use a standard dropper to drop a drop of water onto the fabric surface from a distance of about 10 cm from the fabric surface, and measure the time it takes for the water drop to wet, diffuse, and completely penetrate the fabric surface under static conditions. The shorter the time, the better the hydrophilic properties.

[0038] Softness performance evaluation Use a fabric style meter to test the bending rigidity of the fabric. The smaller the value, the better the softness.

[0039] The results of the hydrophilic softening performance evaluation of the hydrophilic softening silicone oil emulsion with high alkali resistance and anion stability of the present invention and the comparative silicone oil emulsion are shown in Table 1: Table 1 Comparison of hydrophilic softness of example samples and comparative example samples

[0040] As shown in Table 1, fabrics treated with the highly alkali-resistant, anion-stable, hydrophilic, and soft silicone oil emulsion of the present invention exhibit significantly better hydrophilicity and softness than the control. Furthermore, the ratio of the quaternary ammonium salt-EO / PO polyether dual-modified hydrophilic, soft block silicone oil to the cross-linked polyether-modified silicone oil also significantly affects the hydrophilic and soft properties of the fabric.

[0041] Emulsion stability test Anion resistance stability test By adding anionic substances (such as surfactants and salts), observe whether the silicone oil emulsion breaks, delaminates, or changes in particle size to determine its tolerance to anionic environments. Mix the silicone oil emulsion with 10% anionic surfactant (sodium dodecyl sulfate SDS) in a 1:1 ratio and stir for 10 minutes.

[0042] Centrifugation test: Centrifuge at 3000 rpm for 30 minutes and calculate the stratification rate (stratification volume / total volume × 100%).

[0043] Judgment criteria: No obvious stratification and sedimentation less than 5% are qualified.

[0044] Alkali resistance stability test Simulate an alkaline environment with a NaOH solution to evaluate the emulsion's stability under strong alkaline conditions. Alkaline solution mixing method: Mix the silicone oil emulsion with different concentrations of NaOH solution (e.g., 1%, 2%, and 3%) and stir for 10 minutes. Place the solution in 50°C water for an enhanced test, observing for stratification or precipitation and recording pH changes.

[0045] Judgment standard: No stratification after mixing or pH fluctuation <1.0 is qualified.

[0046] The results of the evaluation of the alkali resistance and anion resistance of the hydrophilic soft silicone oil emulsion with high alkali resistance and anion resistance of the present invention and the comparative silicone oil emulsion are shown in Table 2: Table 2 Comparison of alkali resistance and anion resistance stability of example samples and comparative example samples

[0047] As shown in Table 2, the hydrophilic soft silicone oil emulsion with high alkali resistance and anion stability of the present invention has significantly better alkali resistance stability and anion resistance stability than the control sample.

[0048] Alkali resistance and anion resistance are both stability properties of the emulsion, which are reflected in the application test of the emulsion. A precipitation amount >5% indicates poor anion resistance.

[0049] The above results show that the hydrophilic soft silicone oil emulsion with high alkali resistance and anion resistance stability of the present invention has a good effect on fabric treatment, can significantly improve the hydrophilicity and softness of the fabric, and has excellent alkali resistance and anion resistance stability.

[0050] The above embodiments are used to explain the technical solutions of the present invention. However, the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above specific embodiments to be implemented. Any improvements made by those skilled in the art based on the present invention, or equivalent substitutions of materials used in the present invention, etc., fall within the scope of protection of the patent.

Claims

1. A method for preparing a hydrophilic soft silicone oil emulsion with high alkali resistance and anion stability, characterized in that: The following steps are involved: S1, mixing quaternary ammonium salt-EO / PO polyether double-modified hydrophilic soft block silicone oil, cross-linked polyether silicone oil, nonionic surfactant, zwitterionic surfactant, and organic acid to obtain a mixture; S2, homogenize the mixture of S1, add water, and homogenize again to convert the mixture from a water-in-oil emulsion to an oil-in-water emulsion; S4. Add water and pH adjuster to the oil-in-water emulsion in S2, stir, and filter to obtain a hydrophilic soft silicone oil emulsion with high alkali resistance and anion resistance stability.

2. The method for preparing the hydrophilic soft silicone oil emulsion with high alkali resistance and anion stability according to claim 1, characterized in that: The preparation method includes the following components by weight based on a total amount of 100%: 25-30% of quaternary ammonium salt-EO / PO polyether double-modified hydrophilic soft block silicone oil, 5-10% of cross-linked polyether silicone oil, 3-5% of nonionic surfactant, 0.5-1.5% of zwitterionic surfactant, 0.1-0.5% of organic acid, 0.5-1% of pH regulator, and the balance being deionized water.

3. The method for preparing the hydrophilic soft silicone oil emulsion with high alkali resistance and anion stability according to claim 1, characterized in that: The quaternary ammonium salt-EO / PO polyether double-modified hydrophilic soft block silicone oil has a viscosity of 2000-2500 mPa·s and a solid content of 85±1%.

4. The method for preparing the hydrophilic soft silicone oil emulsion with high alkali resistance and anion stability according to claim 1, characterized in that: The viscosity of the cross-linked polyether silicone oil is 500-1500 mPa s; it is obtained by adding side chain hydrogen silicone oil to hydroxy polyethylene glycol methacrylate; the structural formula of the cross-linked polyether silicone oil is: Wherein the R1 and R2 segments are: -CH2CH2-C(CH3)C(O)O-(CH2CH2O) n -H, m and n are integers between 20 and 50.

5. The method for preparing the hydrophilic soft silicone oil emulsion with high alkali resistance and anion stability according to claim 1, characterized in that: The nonionic surfactant is one or a mixture of isomeric decanol polyoxyethylene ether, lauryl alcohol polyoxyethylene ether, isomeric tridecanol polyoxyethylene ether, and C12-14 secondary alcohol polyoxyethylene ether.

6. The method for preparing the hydrophilic soft silicone oil emulsion with high alkali resistance and anion stability according to claim 1, characterized in that: The zwitterionic surfactant is lauryl amide propyl hydroxysulfobetaine.

7. The method for preparing the hydrophilic soft silicone oil emulsion with high alkali resistance and anion stability according to claim 1, characterized in that: The organic acid is one of glacial acetic acid, lauric acid and citric acid or a mixture of several of them.

8. The method for preparing the hydrophilic soft silicone oil emulsion with high alkali resistance and anion stability according to claim 1, characterized in that: The pH regulator is one or a mixture of acetic acid / sodium acetate, citric acid / sodium citrate, boric acid-triethanolamine.

9. The method for preparing the hydrophilic soft silicone oil emulsion with high alkali resistance and anion stability according to claim 1, characterized in that: In step S2, the speed is set to 2000 rpm-2500 rpm during the homogenization process, and the stirring and mixing is performed for 60 s-120 s; in step S3, the speed is set to 3500 rpm-4500 rpm during the homogenization process, and the stirring and mixing is performed for 60 s-120 s.

10. A hydrophilic soft silicone oil emulsion with high alkali resistance and anion stability, characterized in that: The anions in the resistant anions include one or a mixture of sodium lauryl sulfate, sodium lauryl sulfonate, sodium lauryl polyether sulfate and sodium stearate.

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