Non-ionic polymerization emulsion and preparation method thereof

Abstract

The invention belongs to the field of auxiliaries, and particularly relates to a nonionic polymerization emulsion and a preparation method thereof. The nonionic polymerization emulsion is prepared from the following raw materials in percentage by weight: 30 to 90 percent of siloxane low polymer, 2 to 30 percent of nonionic emulsifier, 0.05 to 5 percent of catalyst, 0.05 to 5 percent of neutralizer and the balance of water. The preparation method comprises the following steps: mixing an emulsifier, a part of water and a part of a catalyst, adding a siloxane low polymer, stirring and shearing to obtain an ointment-in-water body, diluting, adding the rest of the catalyst to prepare a pre-emulsion, heating, polymerizing, neutralizing and terminating the reaction. The problems of low nonionic polymerization efficiency and insufficient internal phase viscosity are solved, and the product is high in internal phase viscosity, uniform in particle size, good in stability and suitable for the fields of spinning, leather, personal care and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of auxiliaries, and particularly relates to a non-ionic polymer emulsion and a preparation method thereof. BACKGROUND

[0002] The application field of silicone emulsion is very wide, and the main application fields are in textile leather and personal care. There are two preparation methods of silicone emulsion at present, one is mechanical emulsification method, and the other is emulsion polymerization method. The former has simple process, but it is difficult to make the emulsion particle size very small when preparing high-viscosity silicone oil emulsion, and the emulsion polymerization method makes up for this shortcoming and can make small-particle-size emulsion with internal phase viscosity of millions of centipoise.

[0003] The emulsion polymerization technology can be divided into ionic (anionic, cationic) and non-ionic according to the type of emulsifier used. In current industrial production, ionic emulsion polymerization method, especially anionic process, occupies a dominant position due to its fast polymerization rate, large internal phase viscosity improvement space and other characteristics. However, ionic emulsion has significant limitations: in sensitive scenarios 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; at the same time, the compatibility of ionic emulsion with other systems is poor, which limits its application in composite auxiliaries.

[0004] Non-ionic emulsion has the advantages of low irritation, high compatibility, strong electrolyte stability, etc. due to the absence of ionic groups in the emulsifier, which meets the needs of high-end application scenarios. However, the existing non-ionic emulsion polymerization technology has been facing two major pain points for a long time: first, low polymerization efficiency, the emulsifying ability of non-ionic emulsifiers is weaker than that of ionic ones, leading to insufficient dispersion of the oil phase, low contact efficiency of the catalyst and the monomer, and insufficient monomer conversion; second, it is difficult to achieve high internal phase viscosity, the internal phase viscosity of the non-ionic silicone emulsion prepared by the existing technology is generally low, which cannot meet the performance requirements of high softness in textile and long-lasting lubrication in personal care. In addition, in the existing non-ionic polymerization system, the catalyst is mostly added at one time, which can easily cause local concentration to be too high to trigger side reactions, or the concentration to be too low to cause insufficient polymerization, further exacerbating the problems of product stability and performance consistency.

[0005] Therefore, the present application is proposed based on the above. SUMMARY

[0006] In order to solve the problems existing in the prior art, the present application provides a non-ionic polymer emulsion, which comprises the following preparation raw materials in weight percentage: siloxane oligomer 30-90%, non-ionic emulsifier 2-30%, catalyst 0.05-5%, neutralizing agent 0.05-5%, and the balance of water; wherein: The siloxane oligomer comprises one or both of cyclic siloxane and short-chain hydroxyl-terminated siloxane; The non-ionic emulsifier comprises one or a combination of more than two of polyoxyalkylene alkyl ether, polyoxyalkylene alkyl phenyl ether, polyoxyalkylene lauryl ether, and polyoxyalkylene sorbitan ester; The catalyst comprises an acid catalyst or a base catalyst; the acid catalyst comprises one or a combination of more than two of sulfuric acid, hydrochloric acid, phosphoric acid, formic acid, and acetic acid; the base catalyst comprises one or a combination of more than two of lithium hydroxide, potassium hydroxide, sodium hydroxide, ammonium hydroxide, triethanolamine, and ethanolamine; The neutralizing agent is a neutralizing agent for neutralizing the catalyst. Alkalis such as lithium hydroxide, potassium hydroxide, sodium hydroxide, ammonium hydroxide, triethanolamine, and ethanolamine, or acids such as sulfuric acid, hydrochloric acid, phosphoric acid, formic acid, and acetic acid can be selected.

[0007] The water can be deionized water, well water, mineral water, tap water, or the like.

[0008] Preferably, the non-ionic polymeric emulsion comprises the following weight percentages of raw materials: 70% siloxane oligomer, 14.57% non-ionic emulsifier, 2% catalyst, 2.05% neutralizing agent, and the balance water.

[0009] Preferably, the cyclic siloxane comprises one or a combination of more than two of hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane.

[0010] Preferably, the short-chain hydroxyl-terminated siloxane is as shown in Formula I: Formula I wherein R1 and R2 are alkyl groups or phenyl groups containing 1-6 carbon atoms; and n is an integer representing the degree of polymerization, which is not specifically limited, 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 groups, ethyl groups, propyl groups, phenyl groups, or allyl groups.

[0012] Based on the same technical concept, another aspect of the present application provides a preparation method of a non-ionic polymeric emulsion, which comprises the following steps: (1) mixing a non-ionic emulsifier, part of water, and part of a catalyst uniformly, adding a siloxane oligomer to perform stirring and shearing, and obtaining an oil-in-water paste; (2) adding the remaining water to the oil-in-water paste to dilute, then adding the remaining catalyst, and stirring uniformly to obtain a pre-emulsion; (3) heating the pre-emulsion to perform polymerization, and obtaining a polymerization liquid; (4) adding a neutralizing agent to the polymerization solution to terminate polymerization, thereby obtaining the non-ionic polymerization emulsion.

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

[0014] Preferably, in step (2), the stirring uniformity 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 2-72 h.

[0016] It should be noted that, in order to improve the applicability of the non-ionic emulsion, related additives such as fragrances, colorants, thickeners, preservatives, etc. can be added as needed to improve the performance.

[0017] The beneficial effects of the present application are: 1. Significantly improving the polymerization efficiency: the present application significantly improves the polymerization efficiency of the emulsion by optimizing the catalyst addition method (adding part of the catalyst before phase transfer, and supplementing the remaining catalyst after dilution), which solves the pain point of insufficient polymerization reaction in the existing non-ionic system.

[0018] 2. Achieving high internal phase viscosity breakthrough: the present application prepares an emulsion with an internal phase viscosity of up to hundreds of thousands of mPa・s by reasonably matching the siloxane oligomer and non-ionic emulsifier, combined with a step-by-step polymerization process, which makes up for the technical shortcoming of non-ionic polymerization that is difficult to achieve high internal phase viscosity, and meets the stringent requirements of high-end application scenarios for emulsion viscosity.

[0019] 3. Optimizing emulsion particle size and stability: the non-ionic polymerization emulsion prepared by the present application has uniform and small particle size through control of the stirring shearing parameters and stepwise dilution process, and the emulsion has no layering and no oil floating phenomenon after being stored at 50℃ for 1 month with the pH adjustment effect of the neutralizing agent, which solves the problem of poor stability of existing high-viscosity emulsions and prolongs the shelf life of the product.

[0020] 4. Strong compatibility and low irritation: the present application uses a non-ionic emulsifier system, and the product does not contain ionic residues, which not only has good compatibility with cationic, anionic and non-ionic additives, but also can be widely used in combination, and has extremely low irritation, which is suitable for sensitive scenes such as personal care and infant textiles, and breaks through the application limitations of ionic emulsions. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0022] Embodiment 1 The present embodiment provides a preparation method of a non-ionic polymer emulsion, which comprises the following steps (detailed description): (I) Preparation of raw materials: Silicone oligomer: short-chain hydroxyl-terminated silicone, viscosity 67.2 mPa·s, brand XIAMETER PMX-0156 silicone alcohol silicone oil, purchased from Dow (Zhangjiagang) Investment Co., Ltd.

[0023] Non-ionic emulsifier: secondary alcohol polyoxyethylene ether, brand TERGITO 15-S-40 (70% Aqueous) surfactant, purchased from Dow Chemical (Shanghai) Co., Ltd., and secondary alcohol polyoxyethylene ether, brand 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, self-made.

[0027] (II) Preparation process: (1) In a 500 mL three-necked flask, 18 g of TERGITO 15-S-9, 25.71 g of TERGITO 15-S-40 and 10.29 g of deionized water were sequentially added; a top-mounted stirrer was started to stir at a speed of 150 r / min for 15 min (operation effect: the two emulsifiers were fully dissolved and uniformly mixed to form a uniform aqueous phase base, laying a foundation for subsequent oil phase dispersion); until the system was transparent and uniform without obvious particles.

[0028] (2) 3 g of 50% KOH aqueous solution was slowly added to the above aqueous phase system, and the stirring was continued at a speed of 150 r / min for 5 min (the catalyst was fully combined with the aqueous phase to preliminarily activate the catalytic activity, and conditions were created for the polymerization reaction of the silicone oligomer to start); the dropping speed was controlled at 1 drop / s to avoid excessive local alkalinity leading to decomposition of the emulsifier.

[0029] (3) Under the stirring state, 210 g of XIAMETER PMX-0156 silanol silicone oil is slowly added (to avoid oil phase agglomeration and ensure uniform dispersion of the oil phase in the water phase); the stirring speed of the blender is increased to 1000 r / min, and the shearing is continuously stirred for 10 min (the oil phase particles are broken by mechanical shearing force, so that the oil phase is wrapped 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 an oil-in-water paste is obtained.

[0030] (4) The stirring speed of the blender is adjusted to 100 r / min, and 16.32 g of deionized water is slowly added to the oil-in-water paste (to adjust the solid content of the system and reduce the paste viscosity, so as to provide sufficient space for subsequent catalyst dispersion and polymerization reaction), and the paste is stirred for 10 min until the paste gradually flows and the system is uniform without local clumping.

[0031] (5) 9 g of 50% KOH aqueous solution is added to the diluted system, and the stirring speed is kept at 100 r / min for 10 min (to supplement the catalyst dosage and ensure that the polymerization reaction continues and proceeds fully, and the stepwise addition can improve the utilization rate of the catalyst and avoid the problem of local high or low concentration caused by one-time addition), and a uniform and stable pre-emulsion is formed.

[0032] (6) The three-necked flask containing the pre-emulsion is sealed and placed in a 50°C constant temperature oven, and the polymerization is carried out for 24 h (at an appropriate temperature, the siloxane oligomer reacts and gradually increases the internal phase viscosity, and constant temperature standing can avoid emulsion demulsification caused by stirring to ensure uniform polymerization reaction).

[0033] (7) The polymerized system is taken out and cooled to 25°C, and 7.68 g of 80% acetic acid aqueous solution is slowly added dropwise under the condition of 100 r / min stirring (to neutralize the remaining KOH in the system, terminate the polymerization reaction, avoid the deterioration of the emulsion caused by residual catalyst, and improve the storage stability of the emulsion), and continue to stir for 10 min after the dropwise addition is completed to ensure uniform pH of the system.

[0034] (8) The neutralized emulsion is filtered through a stainless steel filter screen (to remove a small amount of agglomerates or impurities that may be generated during the polymerization process and improve the purity of the product), and the filtered emulsion is collected, which is the final non-ionic polymer emulsion product.

[0035] Example 2 The present embodiment provides a preparation method of a non-ionic polymer emulsion, which comprises the following steps (brief description): Mix 18 g of 15-S-9 and 25.71 g of 15-S-40 with 10.29 g of deionized water; mix well; then add 3 g of KOH (50%) and mix well; then add 210 g of hydroxyl silicone oil PMX-0156, and stir at 1000 r / min for 10 min to make the phase inversion into an oil-in-water cream. Adjust the stirring speed to 100 r / min, slowly add 16.32 g of deionized water to the cream, and stir for 10 min; then add 9 g of KOH (50%) and stir for 10 min. Place the obtained sample in an oven at 80°C and let stand for 24 h. Then take out and add 7.68 g of acetic acid (80%), and stir at 100 r / min for 10 min to obtain the final nonionic polymer emulsion product.

[0036] Example 3 This example provides a method for preparing a nonionic polymer emulsion, which comprises the following steps (brief description): Mix 10.8 g of 15-S-9 and 15.42 g of 15-S-40 with 6.18 g of deionized water; mix well; then add 3 g of KOH (50%) and mix well; then add 210 g of hydroxyl silicone oil PMX-0156, and stir at 1000 r / min for 10 min to make the phase inversion into an oil-in-water cream. Adjust the stirring speed to 100 r / min, slowly add 47.76 g of deionized water to the cream, and stir for 10 min; then add 3 g of KOH (50%) and stir for 10 min. Place the obtained sample in an oven at 50°C and let stand for 24 h. Then take out and add 3.84 g of acetic acid (80%), and stir at 100 r / min for 10 min to obtain the final nonionic polymer emulsion product.

[0037] Example 4 This example provides a method for preparing a nonionic polymer emulsion, which comprises the following steps (brief description): Mix 10.8 g of 15-S-9 and 15.42 g of 15-S-40 with 6.18 g of deionized water; mix well; then add 3 g of KOH (50%) and mix well; then add 210 g of hydroxyl silicone oil PMX-0156, and stir at 1000 r / min for 10 min to make the phase inversion into an oil-in-water cream. Adjust the stirring speed to 100 r / min, slowly add 47.76 g of deionized water to the cream, and stir for 10 min; then add 3 g of KOH (50%) and stir for 10 min. Place the obtained sample in an oven at 50°C and let stand for 24 h. Then take out and add 3.84 g of acetic acid (80%), and stir at 100 r / min for 10 min to obtain the final nonionic polymer emulsion product.

[0038] Example 5 The present example provides a method of preparing a non-ionic polymeric emulsion, the method comprising the following steps (in brief): To 51.42 g of 15-S-40, 2.58 g of deionized water was added and mixed well; 3 g of KOH (50%) was then added and mixed well; 210 g of hydroxyl silicone oil PMX-0156 was then added and stirred at 1000 rpm for 10 min to form an oil-in-water cream. The stirring speed was adjusted to 100 rpm, and 16.32 g of deionized water was slowly added to the cream, stirred for 10 min, and then 9 g of KOH (50%) was added and stirred for 10 min. The resulting sample was placed in an oven at 50 °C and allowed to stand for 24 h. After that, 7.68 g of acetic acid (80%) was added, stirred at 100 rpm for 10 min, and the final non-ionic polymeric emulsion product was obtained.

[0039] Example 6 The present example provides a method of preparing a non-ionic polymeric emulsion, the method comprising the following steps (in brief): To 51.42 g of 15-S-40, 2.58 g of deionized water was added and mixed well; 3 g of KOH (50%) was then added and mixed well; 210 g of hydroxyl silicone oil PMX-0156 was then added and stirred at 1000 rpm for 10 min to form an oil-in-water cream. The stirring speed was adjusted to 100 rpm, and 16.32 g of deionized water was slowly added to the cream, stirred for 10 min, and then 9 g of KOH (50%) was added and stirred for 10 min. The resulting sample was placed in an oven at 50 °C and allowed to stand for 24 h. After that, 7.68 g of acetic acid (80%) was added, stirred at 100 rpm for 10 min, and the final non-ionic polymeric emulsion product was obtained.

[0040] Example 7 To 51.42 g of 15-S-40, 2.58 g of deionized water was added and mixed well; 3 g of KOH (50%) was then added and mixed well; 210 g of hydroxyl silicone oil PMX-0156 was then added and stirred at 1000 rpm for 10 min to form an oil-in-water cream. The stirring speed was adjusted to 100 rpm, and 16.32 g of deionized water was slowly added to the cream, stirred for 10 min, and then 9 g of KOH (50%) was added and stirred for 10 min. The resulting sample was placed in an oven at 50 °C and allowed to stand for 24 h. After that, 7.68 g of acetic acid (80%) was added, stirred at 100 rpm for 10 min, and the final non-ionic polymeric emulsion product was obtained.

[0041] Comparative Example 1 To 18 g of 15-S-9 and 25.71 g of 15-S-40, add 10.29 g of deionized water and mix well; then add 210 g of hydroxyl silicone oil PMX-0156 and stir at 1000 rpm for 10 min to form an oil-in-water cream. Adjust the stirring speed to 100 rpm, slowly add 16.32 g of deionized water to the cream, and stir for 10 min; then add 12 g of KOH (50%) and stir for 10 min. Place the resulting sample in an oven at 50 °C and let stand for 24 h. Then remove the sample and add 7.68 g of acetic acid (80%) and stir at 100 rpm for 10 min to obtain the final emulsion product.

[0042] Comparative Example 1 differs from Example 1 in that KOH is not added before phase inversion of the hydroxyl silicone oil, but is added after dilution of the phase-inverted material.

[0043] Comparative Example 2 To 18 g of 15-S-9 and 25.71 g of 15-S-40, add 10.29 g of deionized water and mix well; then add 210 g of hydroxyl silicone oil PMX-0156 and stir at 1000 rpm for 10 min to form an oil-in-water cream. Adjust the stirring speed to 100 rpm, slowly add 16.32 g of deionized water to the cream, and stir for 10 min; then add 12 g of KOH (50%) and stir for 10 min. Place the resulting sample in an oven at 80 °C and let stand for 24 h. Then remove the sample and add 7.68 g of acetic acid (80%) and stir at 100 rpm for 10 min to obtain the final emulsion product.

[0044] Comparative Example 2 differs from Example 2 in that KOH is not added before phase inversion of the hydroxyl silicone oil, but is added after dilution of the phase-inverted material.

[0045] Comparative Example 3 To 10.8 g of 15-S-9 and 15.42 g of 15-S-40, add 6.18 g of deionized water and mix well; then add 210 g of hydroxyl silicone oil PMX-0156 and stir at 1000 rpm for 10 min to form an oil-in-water cream. Adjust the stirring speed to 100 rpm, slowly add 47.76 g of deionized water to the cream, and stir for 10 min; then add 6 g of KOH (50%) and stir for 10 min. Place the resulting sample in an oven at 50 °C and let stand for 24 h. Then remove the sample and add 3.84 g of acetic acid (80%) and stir at 100 rpm for 10 min to obtain the final emulsion product.

[0046] Comparative Example 3 differs from Example 3 in that KOH is not added before phase inversion of the hydroxyl silicone oil, but is added after dilution of the phase-inverted material.

[0047] Comparative Example 4 To 51.42 g of 15-S-40, 2.58 g of deionized water was added and mixed well; then 210 g of hydroxyl silicone oil PMX-0156 was added and stirred at 1000 rpm for 10 min to make it phase invert into an oil-in-water cream. The stirring speed was adjusted to 100 rpm, and 16.32 g of deionized water was slowly added to the cream, stirred for 10 min, and then 12 g of KOH (50%) was added and stirred for 10 min. The obtained sample was placed in a 50°C oven for 24 h. After that, 7.68 g of acetic acid (80%) was added, stirred at 100 rpm for 10 min, and the final emulsion product was obtained.

[0048] Comparative Example 4 differs from Example 4 in that no KOH was added before the phase inversion of the hydroxyl silicone oil, but was added after the phase inversion dilution.

[0049] Comparative Example 5 To 51.42 g of 15-S-40, 2.58 g of deionized water was added and mixed well; then 210 g of hydroxyl silicone oil PMX-0156 was added and stirred at 1000 rpm for 10 min to make it phase invert into an oil-in-water cream. The stirring speed was adjusted to 100 rpm, and 16.32 g of deionized water was slowly added to the cream, stirred for 10 min, and then 12 g of KOH (50%) was added and stirred for 10 min. The obtained sample was placed in a 50°C oven for 24 h. After that, 7.68 g of acetic acid (80%) was added, stirred at 100 rpm for 10 min, and the final emulsion product was obtained.

[0050] Comparative Example 5 differs from Example 6 in that no KOH was added before the phase inversion of the hydroxyl silicone oil, but was added after the phase inversion dilution.

[0051] Test Example (I) Emulsion internal phase viscosity (i.e., emulsion silicone oil viscosity) determination 2 g of emulsion was added to 10 mL of isopropyl alcohol (IPA), and after being mixed well, it was centrifuged at 3000 rpm for 10 min in a centrifuge to separate the lower layer of polymer. The above steps were repeated at least three times with IPA to sufficiently remove the emulsifier and water in the polymer. The removed polymer was placed in a petri dish and dried in a vacuum drying oven at 60°C for 2 h. After cooling to room temperature, the viscosity was tested using a rheometer.

[0052] (II) Emulsion particle size determination Malvern 2000 was used to determine the particle size of the emulsion.

[0053] (III) Emulsion stability evaluation Storage stability of the emulsion at 50℃: the emulsion was placed in a 100ml wide-mouth transparent plastic bottle and placed in a 50℃ oven. It was observed once a week for 1 month. The specific observation method: visually observe the appearance and overall changes of the emulsion, such as uniformity and no oil floating, delamination, etc. The emulsion is stable, otherwise the emulsion is poor in stability.

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

[0055] Table 1

[0056] The above results clearly show that the present application can significantly improve the polymerization efficiency of the emulsion by adding part of the catalyst before phase inversion to oil-in-water in the non-ionic system, and can prepare stable high internal phase viscosity small particle size polymer emulsion. The product prepared by the present application can be applied to the textile, leather and personal care industries. The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection 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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