A non-ionic polymeric emulsion and a process for its preparation

Abstract

This invention belongs to the field of additives, specifically relating to a nonionic polymeric emulsion and its preparation method. The nonionic polymeric emulsion comprises the following raw materials by weight percentage: 30-90% siloxane oligomer, 2-30% nonionic emulsifier, 0.05-5% catalyst, 0.05-5% neutralizer, and the balance being water. The preparation steps include: mixing the emulsifier, a portion of water, and a portion of the catalyst; adding the siloxane oligomer and stirring / shearing to obtain an oil-in-water paste; diluting and adding the remaining catalyst to prepare a pre-emulsion; heating and polymerizing; and then neutralizing to terminate the reaction. This invention solves the problems of low efficiency and insufficient internal phase viscosity in nonionic polymerization, resulting in a product with high internal phase viscosity, uniform particle size, and good stability, suitable for textiles, leather, personal care, and other fields.

Description

Technical Field

[0001] This invention belongs to the field of additives, and specifically relates to a nonionic polymeric emulsion and its preparation method. Background Technology

[0002] Silicone emulsions have a wide range of applications, primarily in textiles, leather, and personal care. Currently, there are two methods for preparing silicone emulsions: mechanical emulsification and emulsion polymerization. The former is simpler, but it's difficult to achieve very small particle sizes when preparing high-viscosity silicone oil emulsions. Emulsion polymerization overcomes this limitation, allowing for the production of small-particle-size emulsions with internal phase viscosities in the millions of centipoises.

[0003] Emulsion polymerization technology can be divided into ionic (anionic and cationic) and nonionic types, depending on the type of emulsifier used. Currently, ionic emulsion polymerization, especially anionic processes, dominates industrial production due to its fast polymerization rate and large potential for increasing internal phase viscosity. However, ionic emulsions have significant limitations: in sensitive applications such as personal care, ionic emulsifiers may cause skin irritation and allergic reactions; in textile fiber finishing, ionic residues can easily lead to decreased fiber hydrophilicity and poor dyeing uniformity; furthermore, ionic emulsions have poor compatibility with other systems, limiting their application in composite auxiliaries.

[0004] Nonionic emulsions, due to the absence of ionic groups in their emulsifiers, possess significant advantages such as low irritation, high compatibility, and strong electrolyte stability, making them well-suited for high-end applications. However, existing nonionic emulsion polymerization technologies have long faced two major pain points: firstly, low polymerization efficiency, as nonionic emulsifiers have weaker emulsifying capabilities than ionic emulsifiers, leading to insufficient oil phase dispersion, low catalyst-monomer contact efficiency, and insufficient monomer conversion; secondly, difficulty in achieving high internal phase viscosity, as nonionic silicone emulsions prepared by existing technologies generally have low internal phase viscosity, failing to meet the performance requirements of high softness in textiles and long-lasting lubrication in personal care applications. Furthermore, in existing nonionic polymerization systems, catalysts are often added only once, easily causing excessively high local concentrations leading to side reactions, or excessively low concentrations resulting in incomplete polymerization, further exacerbating the problems of product stability and performance consistency.

[0005] Therefore, based on this, the technical solution of the present invention is proposed. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention provides a nonionic polymeric emulsion comprising the following raw materials by weight percentage: 30-90% siloxane oligomer, 2-30% nonionic emulsifier, 0.05-5% catalyst, 0.05-5% neutralizer, and the balance being water; wherein: The siloxane oligomer includes one or two of cyclosiloxanes and short-chain hydroxy-terminated siloxanes. The nonionic emulsifier includes one or more of polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene lauryl ethers, and polyoxyethylene sorbitol esters. The catalyst includes an acid catalyst or a base catalyst; the acid catalyst includes one or more of sulfuric acid, hydrochloric acid, phosphoric acid, formic acid, and acetic acid; the base catalyst includes one or more of lithium hydroxide, potassium hydroxide, sodium hydroxide, ammonium hydroxide, triethanolamine, and ethanolamine. The neutralizing agent is used to neutralize the catalyst. It can be a base such as lithium hydroxide, potassium hydroxide, sodium hydroxide, ammonium hydroxide, triethanolamine, or ethanolamine, or an acid such as sulfuric acid, hydrochloric acid, phosphoric acid, formic acid, or acetic acid.

[0007] The water can be deionized water, well water, mineral water, tap water, etc.

[0008] Preferably, the nonionic polymeric emulsion comprises the following raw materials by weight percentage: 70% siloxane oligomer, 14.57% nonionic emulsifier, 2% catalyst, 2.05% neutralizer, and the balance water.

[0009] Preferably, the cyclosiloxane comprises one or more of hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecylcyclohexasiloxane.

[0010] Preferably, the short-chain hydroxyl-terminated siloxane is as shown in Formula I: Formula I Wherein: R1 and R2 are alkyl or phenyl groups containing 1-6 carbon atoms. n is an integer representing the degree of polymerization, without specific limitations, but the viscosity of the short-chain hydroxyl-terminated siloxane is required to be 10-2000 mPa·s.

[0011] Preferably, R1 and R2 are methyl, ethyl, propyl, phenyl, or allyl.

[0012] Based on the same technical concept, another aspect of the present invention is to provide a method for preparing a nonionic polymeric emulsion, the preparation method comprising the following steps: (1) Mix nonionic emulsifier, part water and part catalyst evenly, add siloxane oligomer and stir and shear to obtain oil-in-water paste; (2) Add the remaining water to the oil-in-water paste to dilute it, and then add the remaining catalyst. Stir well to obtain a pre-emulsion. (3) The preemulsion is heated and polymerized to obtain a polymer solution; (4) Add a neutralizing agent to the polymerization liquid to terminate the polymerization, thereby obtaining the nonionic polymer emulsion.

[0013] Preferably, in step (1), the stirring and shearing speed is 300-8000 r / min, and the stirring and shearing time is 10-60 min.

[0014] Preferably, in step (2), the stirring speed is 100-2000 r / min and the stirring time is 10-60 min.

[0015] Preferably, in step (3), the heating polymerization temperature is 10-95℃ and the time is 2-72h.

[0016] It should be noted that, in order to improve the applicability of nonionic emulsions, relevant additives, such as fragrances, colorants, thickeners, and preservatives, can be added as needed to improve performance.

[0017] The beneficial effects of this invention are as follows: 1. Significantly improves polymerization efficiency: This invention significantly improves the polymerization efficiency of emulsions by optimizing the catalyst addition method (adding part of the catalyst before phase inversion and supplementing the remaining catalyst after phase inversion dilution), thus solving the problem of insufficient polymerization reaction in existing non-ionic systems.

[0018] 2. Achieving a breakthrough in high internal phase viscosity: This invention, through the rational ratio of siloxane oligomers and nonionic emulsifiers, combined with a stepwise polymerization process, prepares emulsions with internal phase viscosities that can reach hundreds of thousands of mPa·s. This overcomes the technical shortcoming of nonionic polymerization in achieving high internal phase viscosity and meets the stringent requirements of high-end application scenarios for emulsion viscosity.

[0019] 3. Optimization of emulsion particle size and stability: By controlling the stirring and shearing parameters and the step-dilution process, the nonionic polymeric emulsion prepared by this invention has a uniform and small particle size. Combined with the pH adjustment effect of the neutralizing agent, the emulsion does not separate or exhibit oil floating phenomenon after being stored at 50°C for 1 month, which solves the problem of poor stability of existing high-viscosity emulsions and extends the product shelf life.

[0020] 4. Strong compatibility and low irritation: This invention uses a nonionic emulsifier system, and the product does not contain ionic residues. It has good compatibility with cationic, anionic, and nonionic auxiliaries, and can be widely compounded. It also has extremely low irritation and is suitable for sensitive scenarios such as personal care and infant textiles, breaking through the application limitations of ionic emulsions. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] Example 1 This embodiment provides a method for preparing a nonionic polymeric emulsion, the method comprising the following steps (detailed): (a) Raw material preparation: Siloxane oligomer: short-chain hydroxyl-terminated siloxane, viscosity 67.2 mPa·s, brand name XIAMETER PMX-0156 silanol silicone oil, purchased from Dow (Zhangjiagang) Investment Co., Ltd.

[0023] Nonionic emulsifiers: secondary alcohol polyoxyethylene ether, brand name TERGITO 15-S-40 (70% Aqueous) surfactant, purchased from Dow Chemical (Shanghai) Co., Ltd.; and secondary alcohol polyoxyethylene ether, brand name TERGITO 15-S-9 surfactant, purchased from Dow Chemical (Shanghai) Co., Ltd.

[0024] Catalyst: Potassium hydroxide, purchased from Sinopharm Chemical Reagent Co., Ltd.

[0025] Neutralizing agent: acetic acid, purchased from Sinopharm Chemical Reagent Co., Ltd.

[0026] Water: Deionized water, homemade.

[0027] (II) Preparation process: (1) In a 500mL three-necked flask, add 18g of TERGITO 15-S-9, 25.71g of TERGITO 15-S-40 and 10.29g of deionized water in sequence; start the top-mounted stirrer and stir at 150r / min for 15min (the purpose of this operation is to fully dissolve and mix the two emulsifiers to form a uniform aqueous phase base, which lays the foundation for subsequent oil phase dispersion), until the system is free of obvious particles and is transparent and uniform.

[0028] (2) Slowly add 3g of 50% KOH aqueous solution to the above aqueous system and continue stirring at 150r / min for 5min (to allow the catalyst to fully integrate with the aqueous phase, initially activate the catalytic activity, and create conditions for the polymerization reaction of siloxane oligomers). The dropping speed is controlled at 1 drop / second to avoid excessive local alkalinity that could lead to emulsifier decomposition.

[0029] (3) While stirring, slowly add 210g of XIAMETER PMX-0156 silicone oil (to avoid oil phase agglomeration and ensure that the oil phase is evenly dispersed in the water phase); increase the speed of the mixer to 1000r / min and continue stirring and shearing for 10min (by mechanical shearing force to break the oil phase particles, the oil phase is encapsulated by the water phase to form a stable oil-in-water paste, and the shearing parameter control can ensure that the initial particle size of the oil phase meets the requirements), and finally obtain the oil-in-water paste.

[0030] (4) Adjust the speed of the mixer to 100 r / min, slowly add 16.32 g of deionized water to the oil-in-water paste (to adjust the solid content of the system, reduce the viscosity of the paste, and provide sufficient space for the subsequent catalyst dispersion and polymerization reaction), and stir for 10 min until the paste gradually flows, the system is uniform, and there is no local clumping.

[0031] (5) Add 9g of 50% KOH aqueous solution to the diluted system and stir at 100r / min for 10min (to supplement the amount of catalyst and ensure that the polymerization reaction continues to proceed fully. Adding in batches can improve the utilization rate of the catalyst and avoid the problem of local concentration being too high or too low due to one-time addition) to form a uniform and stable pre-emulsion.

[0032] (6) After sealing the three-necked flask containing the pre-emulsion, place it in a 50°C constant temperature oven and let it stand for 24 hours to polymerize. (At a suitable temperature, the siloxane oligomer reacts and gradually increases the viscosity of the internal phase. Standing at a constant temperature can avoid emulsion breakage caused by stirring and ensure that the polymerization reaction proceeds uniformly.)

[0033] (7) Take out the polymerized system and cool it to 25°C. While stirring at 100 r / min, slowly add 7.68 g of 80% acetic acid aqueous solution (to neutralize the remaining KOH in the system, terminate the polymerization reaction, avoid residual catalyst causing the emulsion to deteriorate in the later stage, and improve the storage stability of the emulsion). After the addition is completed, continue stirring for 10 min to ensure that the pH of the system is uniform.

[0034] (8) Filter the neutralized emulsion through a stainless steel filter screen (to remove small amounts of coagulated material or impurities that may be generated during the polymerization process and improve product purity). Collect the filtered emulsion, which is the final nonionic polymerized emulsion product.

[0035] Example 2 This embodiment provides a method for preparing a nonionic polymeric emulsion, the method comprising the following steps (briefly described): Add 10.29g of deionized water to 18g of 15-S-9 and 25.71g of 15-S-40, and mix well. Then add 3g of KOH (50%) and mix well. Next, add 210g of hydroxyl silicone oil PMX-0156 and stir at 1000 rpm for 10 minutes using a top-mounted mixer to induce phase inversion into an oil-in-water paste. Adjust the speed to 100 rpm and slowly add 16.32g of deionized water to the paste, stirring for 10 minutes. Then add 9g of KOH (50%) and stir for 10 minutes. Place the resulting sample in an 80℃ oven and let it stand for 24 hours. After that, remove it and add 7.68g of acetic acid (80%), stirring at 100 rpm for 10 minutes using a top-mounted mixer to obtain the final nonionic polymer emulsion product.

[0036] Example 3 This embodiment provides a method for preparing a nonionic polymeric emulsion, the method comprising the following steps (briefly described): Add 6.18g of deionized water to 10.8g of 15-S-9 and 15.42g of 15-S-40, and mix well. Then add 3g of KOH (50%) and mix well. Next, add 210g of hydroxyl silicone oil PMX-0156 and stir at 1000 rpm for 10 minutes using a top-mounted mixer to induce phase inversion into an oil-in-water emulsion. Adjust the speed to 100 rpm and slowly add 47.76g of deionized water to the emulsion, stirring for 10 minutes. Then add 3g of KOH (50%) and stir for 10 minutes. Place the resulting sample in a 50℃ oven and let it stand for 24 hours. Afterward, remove the sample and add 3.84g of acetic acid (80%), stirring at 100 rpm for 10 minutes using a top-mounted mixer to obtain the final nonionic polymer emulsion product.

[0037] Example 4 This embodiment provides a method for preparing a nonionic polymeric emulsion into an ointment. The rotation speed is adjusted to 100 r / min, and 47.76 g of deionized water is slowly added to the ointment, followed by stirring. The preparation method includes the following steps (briefly described): Add 6.18g of deionized water to 10.8g of 15-S-9 and 15.42g of 15-S-40, and mix well. Then add 3g of KOH (50%) and mix well. Next, add 210g of hydroxyl silicone oil PMX-0156 and stir at 1000 rpm for 10 minutes using a top-mounted stirrer until the phase inversion to water-in-oil phase is achieved (0 minutes). Then add 3g of KOH (50%) and stir for 10 minutes. Place the resulting sample in an 80℃ oven and let it stand for 24 hours. After that, remove the sample and add 3.84g of acetic acid (80%), and stir at 100 rpm for 10 minutes using a top-mounted stirrer to obtain the final nonionic polymer emulsion product.

[0038] Example 5 This embodiment provides a method for preparing a nonionic polymeric emulsion, the method comprising the following steps (briefly described): Add 14.88g of deionized water to 10.8g of 15-S-9 and 15.42g of 15-S-40, and mix well. Then add 3g of KOH (50%) and mix well. Next, add 210g of hydroxyl silicone oil PMX-0156 and stir for 10 minutes using a top-mounted mixer at 1000 rpm to induce phase inversion into an oil-in-water emulsion. Adjust the speed to 100 rpm and slowly add 29.22g of deionized water to the emulsion, stirring for 10 minutes. Then add 9g of KOH (50%) and stir for 10 minutes. Place the resulting sample in an 80℃ oven and let it stand for 24 hours. Afterward, remove the sample and add 7.68g of acetic acid (80%), stirring for 10 minutes using a top-mounted mixer at 100 rpm to obtain the final nonionic polymer emulsion product.

[0039] Example 6 This embodiment provides a method for preparing a nonionic polymeric emulsion, the method comprising the following steps (briefly described): Add 2.58g of deionized water to 51.42g of 15-S-40 and mix well. Then add 3g of KOH (50%) and mix well. Next, add 210g of hydroxyl silicone oil PMX-0156 and stir for 10 minutes using a top-mounted mixer at 1000 rpm to form an oil-in-water emulsion. Adjust the speed to 100 rpm and slowly add 16.32g of deionized water to the emulsion, stirring for 10 minutes. Then add 9g of KOH (50%) and stir for 10 minutes. Place the resulting sample in a 50℃ oven and let it stand for 24 hours. After that, remove it and add 7.68g of acetic acid (80%), stirring for 10 minutes using a top-mounted mixer at 100 rpm to obtain the final nonionic polymer emulsion product.

[0040] Example 7 Add 2.58g of deionized water to 51.42g of 15-S-40 and mix well; then add 3g of KOH (50%) and mix well; then add 210g of hydroxyl silicone oil PMX-0156 and stir at 1000rpm for 10min using a top-mounted mixer to induce phase inversion into an oil-in-water emulsion. Adjust the speed to 100rpm and slowly add 16.32g of deionized water to the emulsion, stirring for 10min, then add 9g of KOH (50%) and stir for 10min. Place the resulting sample in a 50℃ oven and let it stand for 28h. Afterward, remove the sample and add 7.68g of acetic acid (80%), stirring at 100rpm for 10min using a top-mounted mixer to obtain the final emulsion product.

[0041] Comparative Example 1 Add 10.29g of deionized water to 18g of 15-S-9 and 25.71g of 15-S-40, and mix thoroughly. Then add 210g of hydroxyl silicone oil PMX-0156 and stir at 1000 rpm for 10 minutes using a top-mounted mixer to induce phase inversion into an oil-in-water emulsion. Adjust the speed to 100 rpm and slowly add 16.32g of deionized water to the emulsion, stirring for 10 minutes. Then add 12g of KOH (50%) and stir for 10 minutes. Place the resulting sample in a 50℃ oven and let it stand for 24 hours. Afterward, remove the sample and add 7.68g of acetic acid (80%), stirring at 100 rpm for 10 minutes using a top-mounted mixer to obtain the final emulsion product.

[0042] The difference between Comparative Example 1 and Example 1 is that no KOH was added before the hydroxyl silicone oil was inverted; it was added entirely after the dilution following the inversion.

[0043] Comparative Example 2 Add 10.29g of deionized water to 18g of 15-S-9 and 25.71g of 15-S-40, and mix thoroughly. Then add 210g of hydroxyl silicone oil PMX-0156 and stir at 1000 rpm for 10 minutes using a top-mounted mixer to induce phase inversion into an oil-in-water emulsion. Adjust the speed to 100 rpm and slowly add 16.32g of deionized water to the emulsion, stirring for 10 minutes. Then add 12g of KOH (50%) and stir for 10 minutes. Place the resulting sample in an 80℃ oven and let it stand for 24 hours. Afterward, remove the sample and add 7.68g of acetic acid (80%), stirring at 100 rpm for 10 minutes using a top-mounted mixer to obtain the final emulsion product.

[0044] The difference between Comparative Example 2 and Example 2 is that no KOH was added before the hydroxyl silicone oil was inverted; it was added entirely after the dilution following the inversion.

[0045] Comparative Example 3 Add 6.18g of deionized water to 10.8g of 15-S-9 and 15.42g of 15-S-40, and mix thoroughly. Then add 210g of hydroxyl silicone oil PMX-0156 and stir for 10 minutes using a top-mounted mixer at 1000 rpm to form an oil-in-water emulsion. Adjust the speed to 100 rpm and slowly add 47.76g of deionized water to the emulsion, stirring for 10 minutes. Then add 6g of KOH (50%) and stir for 10 minutes. Place the resulting sample in a 50℃ oven and let it stand for 24 hours. After that, remove it and add 3.84g of acetic acid (80%), stirring for 10 minutes using a top-mounted mixer at 100 rpm to obtain the final emulsion product.

[0046] The difference between Comparative Example 3 and Example 3 is that no KOH was added before the hydroxyl silicone oil was inverted; it was added entirely after the dilution following the inversion.

[0047] Comparative Example 4 Add 6.18g of deionized water to 10.8g of 15-S-9 and 15.42g of 15-S-40, and mix thoroughly. Then add 210g of hydroxyl silicone oil PMX-0156 and stir for 10 minutes using a top-mounted mixer at 1000 rpm to form an oil-in-water emulsion. Adjust the speed to 100 rpm and slowly add 47.76g of deionized water to the emulsion, stirring for 10 minutes. Then add 6g of KOH (50%) and stir for 10 minutes. Place the resulting sample in an 80℃ oven and let it stand for 24 hours. After that, remove it and add 3.84g of acetic acid (80%), stirring for 10 minutes using a top-mounted mixer at 100 rpm to obtain the final emulsion product.

[0048] The difference between Comparative Example 4 and Example 4 is that no KOH was added before the hydroxyl silicone oil was inverted; it was added entirely after the dilution following the inversion.

[0049] Comparative Example 5 Add 2.58g of deionized water to 51.42g of 15-S-40 and mix well. Then add 210g of hydroxyl silicone oil PMX-0156 and stir for 10 minutes using a top-mounted mixer at 1000 rpm to form an oil-in-water emulsion. Adjust the speed to 100 rpm and slowly add 16.32g of deionized water to the emulsion, stirring for 10 minutes. Then add 12g of KOH (50%) and stir for 10 minutes. Place the resulting sample in a 50℃ oven and let it stand for 24 hours. After that, remove it and add 7.68g of acetic acid (80%), stirring for 10 minutes using a top-mounted mixer at 100 rpm to obtain the final emulsion product.

[0050] The difference between Comparative Example 5 and Example 6 is that no KOH was added before the hydroxyl silicone oil was inverted; it was added entirely after the dilution following the inversion.

[0051] Test case (a) Determination of the viscosity of the internal phase of the emulsion (i.e., the viscosity of the silicone oil in the emulsion). Add 2g of the emulsion to 10mL of isopropanol (IPA), mix thoroughly, and centrifuge at 3000r / min for 10min to separate the lower polymer layer. Repeat the above steps with IPA at least three times to thoroughly remove emulsifiers and water from the polymer. Place the extracted polymer in a petri dish and dry in a vacuum drying oven at 60℃ for 2h. After cooling to room temperature, use a rheological test to determine its viscosity.

[0052] (ii) Determination of emulsion particle size The particle size of the emulsion was determined using a Malvern 2000.

[0053] (III) Evaluation of emulsion stability Storage stability of the emulsion at 50℃: The emulsion was placed in a 100mL wide-mouth transparent plastic bottle and left to stand in a 50℃ oven. Observation was conducted weekly for one month. Specific observation method: Visually inspect the appearance and overall changes of the emulsion. If it is homogeneous and shows no signs of oil floating or layering, the emulsion has good stability; otherwise, its stability is poor.

[0054] The detection results of the examples and comparative examples are shown in Table 1.

[0055] Table 1

[0056] The above results clearly demonstrate that the present invention discovers that in nonionic systems, adding a portion of a catalyst to the siloxane oligomer before phase inversion into an oil-in-water emulsion can significantly improve the polymerization efficiency of the emulsion, enabling the preparation of stable polymeric emulsions with high internal phase viscosity and small particle size. The products prepared by this invention can be applied in industries such as textiles, leather, and personal care. The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A nonionic polymeric emulsion, characterized in that, The preparation raw materials include the following weight percentages: 30-90% siloxane oligomer, 2-30% nonionic emulsifier, 0.05-5% catalyst, 0.05-5% neutralizer, and the balance being water; wherein: The siloxane oligomer includes one or two of cyclosiloxanes and short-chain hydroxy-terminated siloxanes. The nonionic emulsifier includes one or more of polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene lauryl ethers, and polyoxyethylene sorbitol esters. The catalyst includes an acid catalyst or a base catalyst; the acid catalyst includes one or more of sulfuric acid, hydrochloric acid, phosphoric acid, formic acid, and acetic acid; the base catalyst includes one or more of lithium hydroxide, potassium hydroxide, sodium hydroxide, ammonium hydroxide, triethanolamine, and ethanolamine. The neutralizing agent is used to neutralize the catalyst.

2. The nonionic polymeric emulsion according to claim 1, characterized in that, The raw materials include the following weight percentages: 70% siloxane oligomer, 14.57% nonionic emulsifier, 2% catalyst, 2.05% neutralizer, and the balance water.

3. The nonionic polymeric emulsion according to claim 1, characterized in that, The cyclosiloxanes include one or more combinations of hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecylcyclohexasiloxane.

4. The nonionic polymeric emulsion according to claim 1, characterized in that, The short-chain hydroxyl-terminated siloxane is shown in Formula I: Formula I Wherein: R1 and R2 are alkyl or phenyl groups containing 1-6 carbon atoms, and the viscosity of the short-chain hydroxyl-terminated siloxane is 10-2000 mPa·s.

5. The nonionic polymeric emulsion according to claim 4, characterized in that, R1 and R2 are methyl, ethyl, propyl, phenyl, or allyl.

6. A method for preparing the nonionic polymeric emulsion according to any one of claims 1-5, characterized in that, The preparation method includes the following steps: (1) Mix nonionic emulsifier, part water and part catalyst evenly, add siloxane oligomer and stir and shear to obtain oil-in-water paste; (2) Add the remaining water to the oil-in-water paste to dilute it, and then add the remaining catalyst. Stir well to obtain a pre-emulsion. (3) The preemulsion is heated and polymerized to obtain a polymer solution; (4) Add a neutralizing agent to the polymerization liquid to terminate the polymerization, thereby obtaining the nonionic polymer emulsion.

7. The method for preparing the nonionic polymeric emulsion according to claim 6, characterized in that, In step (1), the stirring and shearing speed is 300-8000 r / min, and the stirring and shearing time is 10-60 min.

8. The method for preparing the nonionic polymeric emulsion according to claim 6, characterized in that, In step (2), the stirring speed is 100-2000 r / min and the stirring time is 10-60 min.

9. The method for preparing the nonionic polymeric emulsion according to claim 6, characterized in that, In step (3), the heating polymerization temperature is 10-95℃ and the time is 2-72h.

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