A method for synthesizing a branched block silicone oil

Abstract

The present application relates to the technical fields of silicone oil synthesis, and particularly relates to a synthesis method of branched block silicone oil, comprising the following steps: S1, preparing amino-terminated macromonomer; S2, preparing ammonium salt water intermediate; S3, preparing epoxy-modified polysiloxane intermediate; S4, preparing branched block silicone oil; the present application uses amino-terminated macromonomer containing silicone chain segment to replace traditional monoamine or diamine small molecule end-capping agent, so that the silicone chain segment in the end-capping agent is highly compatible with the polysiloxane main chain in chemical structure, and the stability of the system is significantly improved; meanwhile, the multifunctionality of polyamine enables the final block polysiloxane to have a hyperbranched topological structure, and compared with the traditional (ABA) linear structure, the number of active amino sites on the molecular chain that can be combined with the fiber cloth surface is obviously increased, and the washing fastness of the finished fabric is improved.

Description

Technical Field

[0001] This invention relates to the field of silicone oil synthesis technology, and in particular to a method for synthesizing branched block silicone oil. Background Technology

[0002] Polysiloxanes, due to their unique siloxane skeleton structure, are widely used in the textile finishing field to give fiber fabrics a soft and smooth feel.

[0003] In the preparation of block silicone oils, a ring-opening addition reaction is typically carried out between terminal epoxy polysiloxanes and amine compounds. The amine components used are mostly monofunctional or bifunctional small-molecule organic amines or polyether amines, resulting in block polysiloxanes with a (ABA) or (ABABA) type linear topology. However, due to the limited functionality of the amine components, the number of active amino sites that can bind to the fiber surface in the linear block silicone oil is relatively small, leading to insufficient wash fastness of the finished fabric. Simultaneously, the significant differences in chemical structure between the polyether amine or small-molecule organic amine end-capping agent and the polysiloxane backbone result in limited compatibility, which to some extent restricts the stability of the product system and further improvement of the overall hand feel performance of the fabric.

[0004] Therefore, a synthetic method is needed that can introduce more active amino sites into block polysiloxanes while improving the compatibility between the end-capping agent and the polysiloxane backbone, in order to improve the overall performance of finished fabrics. To this end, we propose a synthetic method for branched block silicone oils to address the aforementioned problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a method for synthesizing branched block silicone oil.

[0006] A method for synthesizing a branched block silicone oil includes the following steps:

[0007] S1. React organosilicon epoxy end-capping agent and polyamine in a molar ratio of 1:(1.5-3) at 100-150℃ for 4-8 hours under nitrogen protection to prepare amino-terminated macromonomers.

[0008] S2. The amino-terminated macromonomer prepared in step S1 is reacted with organic acid and water at 30-80℃ for 4-8 hours to prepare an ammonium salt intermediate; the molar ratio of the amino-terminated macromonomer to the active group of the organic acid is 1:(0.8-1.2).

[0009] S3. Polydimethylsiloxane cyclic or linear polydimethylsiloxane is reacted with an epoxy-based polysiloxane end-capping agent under alkaline catalyst and subjected to a chain extension reaction to obtain an epoxy-modified polysiloxane intermediate.

[0010] S4. The terminal epoxy-modified polysiloxane intermediate prepared in step S3 and the ammonium salt water intermediate prepared in step S2 are reacted at 80-100℃ for 6-10 hours under nitrogen protection in a molar ratio of 1:0.5-2 to obtain branched block silicone oil.

[0011] Preferably, in S1, the polyamine is selected from one or more of tetramethyldipropylenetriamine, diethylenetriamine, triethylenetetramine, and dipropylenetriamine.

[0012] Preferably, in S2, the organic acid is one or more of acetic acid, lauric acid, oleic acid, and citric acid.

[0013] Preferably, in S3, the number-average molecular weight of the terminal epoxy-modified polysiloxane intermediate is 6000-25000 g / mol.

[0014] Preferably, in step S3, the alkaline catalyst is a tetramethylammonium hydroxide ethanol solution with a concentration of 50 wt%, and the mass ratio of the tetramethylammonium hydroxide ethanol solution to polydimethylsiloxane cyclic or linear polydimethylsiloxane is (0.0005-0.001):1. After the chain extension reaction is completed, the temperature is raised to 140-150℃ for catalyst breaking reaction, and low-boiling substances are removed by distillation under reduced pressure not exceeding 1 kPa.

[0015] Preferably, in S3, the polydimethylsiloxane cyclic compound is octamethylcyclotetrasiloxane, and the number-average molecular weight of the epoxy-based polysiloxane end-capping agent is 1000 g / mol.

[0016] Preferably, in step S3, a polyether epoxy-modified polysiloxane is prepared by hydrosilylation reaction of a terminal hydrogen polysiloxane and an allyl epoxy polyether at 40-80°C under the catalysis of a chloroplatinic acid catalyst, wherein the mass ratio of the chloroplatinic acid catalyst to the terminal hydrogen polysiloxane is (0.003-0.004):1, and serves as the intermediate of the terminal epoxy-modified polysiloxane.

[0017] Preferably, step S4 is carried out under solvent-free conditions or with one or more of isopropanol, ethylene glycol monobutyl ether, dipropylene glycol butyl ether, and isohexyl glycol as solvents.

[0018] Preferably, a branched block silicone oil is used to prepare an organosilicon emulsion.

[0019] The specific steps for preparing the organosilicon emulsion are as follows: mix the branched block silicone oil and emulsifier evenly, add water in batches until the system is fluid, add acetic acid, continue to add the remaining water, defoam and filter to obtain the branched block polysiloxane emulsion.

[0020] The emulsifier is one or more of isotridecyl alcohol polyoxyethylene ether, acetylacetonate diol polyoxyethylene ether, and isodecyl alcohol polyoxyethylene ether, and the amount of emulsifier used is 25 wt% of the block polysiloxane mass;

[0021] A diluent is also added when preparing the silicone emulsion. The diluent is one or more of isopropanol, ethylene glycol monobutyl ether, dipropylene glycol butyl ether, and isohexyl glycol.

[0022] The beneficial effects of this invention are:

[0023] 1. This invention uses an amino-terminated macromonomer containing organosilicon segments to replace the traditional mono- or di-amine small-molecule capping agent, making the organosilicon segments in the capping agent highly compatible with the polysiloxane backbone in terms of chemical structure, and significantly improving the stability of the system; at the same time, the multifunctionality of the polyamine gives the final block polysiloxane a hyperbranched topological structure, which, compared with the traditional (ABA) type linear structure, significantly increases the number of active amino sites on the molecular chain that can bind to the fiber surface, thus improving the wash fastness of the finished fabric;

[0024] 2. This invention prepares an ammonium salt intermediate by first reacting an amino-terminated macromonomer with an organic acid to form a salt, and then reacting it with an epoxy-modified polysiloxane at 80-100℃. This allows for a homogeneous reaction under solvent-free or low-solvent conditions, effectively reducing the amount of organic solvent used and improving the environmental friendliness of the process. The resulting hyperbranched block polysiloxane, after emulsification, yields a transparent to pale blue emulsion. The emulsion has a superior appearance compared to traditional polyetheramine products, exhibiting an overall oily feel and meeting the needs of various textile finishing applications. Detailed Implementation

[0025] The present invention will be further explained below with reference to specific embodiments.

[0026] Unless otherwise specified, all raw materials used in the following examples are commercially available. Octamethylcyclotetrasiloxane, tetramethyldisyltriamine, lauric acid, acetic acid, tetramethylammonium hydroxide ethanol solution (50wt%), and chloroplatinic acid catalyst were all purchased from Sinopharm Chemical Reagent Co., Ltd., and were of analytical grade. Organosilicon epoxy end-capping agent (number average molecular weight 1000 g / mol), terminal hydrogen polysiloxane (number average molecular weight 8000 g / mol), and allyl epoxy polyether (number average molecular weight approximately 500 g / mol) were all commercially available industrial products. Isomeric alcohol polyoxyethylene ether TO5 and TO7 were purchased from BASF (China) Co., Ltd.

[0027] The number-average molecular weight of the products was determined by gel permeation chromatography (GPC) using tetrahydrofuran as the mobile phase and polystyrene as the standard.

[0028] Example 1

[0029] In this embodiment, a medium molecular weight terminal epoxy-modified polysiloxane (number average molecular weight of about 8000 g / mol) is prepared and a branched block polysiloxane emulsion is prepared therefrom. The specific steps are as follows.

[0030] S1. Add 362.6g of organosilicon epoxy end-capping agent and 374g of tetramethyldipropylenetriamine to the reaction flask at a molar ratio of 1:2, introduce nitrogen gas, slowly raise the temperature to 100-120℃, and keep the reaction at this temperature for 8 hours to obtain an amino-terminated macromolecular monomer.

[0031] S2. Add 368g of amino-terminated macromonomer to a reaction flask, then add 200g of lauric acid and 22g of distilled water. Stir and heat to 40℃. After the solid has completely disappeared, add 60g of acetic acid. Continue stirring and react at 50℃ for 4 hours to obtain a yellow to brownish-yellow transparent ammonium salt solution.

[0032] S3. Add 200g of octamethylcyclotetrasiloxane and 28.6g of organosilicon epoxy end-capping agent to the reaction flask, stir and heat, and add 0.16g of tetramethylammonium hydroxide ethanol solution (50wt%) catalyst at about 100℃; keep the reaction at 105℃ for 4 hours, and continue to heat to 140℃ for catalyst destruction reaction for 1 hour. Distill off the low-boiling substances under reduced pressure not exceeding 1kPa to obtain a colorless or light-colored transparent epoxy-modified polysiloxane intermediate.

[0033] S4. Add 200g of the epoxy-modified polysiloxane intermediate obtained in step S3 and 29.5g of the ammonium salt solution obtained in step S2 into a reaction flask. Under nitrogen protection, heat to 90°C. After the system becomes transparent, keep it at the temperature for 8 hours to obtain a yellow transparent viscous liquid, which is the branched block silicone oil.

[0034] Preparation of organosilicon emulsion: Take 100g of the above branched block silicone oil and 25g of isomeric alcohol polyoxyethylene ether TO7 and add them to a beaker. Stir well and slowly add water in batches. Stir and disperse until the system has a certain fluidity. Then add 1g of acetic acid and stir for 10 minutes. Then slowly add the remaining water (the total mass of water is 294g). After defoaming, filter to obtain a transparent light blue emulsion, that is, a branched block polysiloxane emulsion.

[0035] Example 2

[0036] In this embodiment, a low molecular weight end-epoxy modified polysiloxane (number average molecular weight of about 6000 g / mol) was prepared and a branched block polysiloxane emulsion was prepared therefrom. The preparation method of the ammonium salt water is the same as in Example 1, and the specific steps are as follows.

[0037] S3. Add 200g of octamethylcyclotetrasiloxane and 40g of organosilicon epoxy end-capping agent to the reaction flask, stir and heat, and add 0.16g of tetramethylammonium hydroxide ethanol solution (50wt%) catalyst at about 100℃; keep the reaction at 110℃ for 4 hours, and continue to heat to 150℃ for catalyst destruction reaction for 1 hour. Distill off the low-boiling substances under reduced pressure conditions not exceeding 1kPa to obtain a colorless or light-colored transparent end-epoxy modified polysiloxane intermediate.

[0038] S4. Add 200g of the epoxy-modified polysiloxane intermediate obtained in step S3 and 39.3g of ammonium salt water to a reaction flask. Under nitrogen protection, heat to 95°C. After the system becomes transparent, keep it at the temperature for 8 hours to obtain a yellow transparent viscous liquid, which is the branched block silicone oil.

[0039] Preparation of silicone emulsion: Take 100g of the above branched block polysiloxane and 25g of isomeric alcohol polyoxyethylene ether TO7 and add them to a beaker. Stir well and slowly add water in batches. Stir and disperse until the system has a certain fluidity. Then add 2g of acetic acid and stir for 10 minutes. Then slowly add the remaining water (the total mass of water is 294g). After defoaming, filter to obtain a blue transparent emulsion.

[0040] Example 3

[0041] In this embodiment, a high molecular weight end-epoxy modified polysiloxane (number average molecular weight of about 20,000 g / mol) was prepared and a branched block polysiloxane emulsion was prepared therefrom. The preparation method of the ammonium salt water is the same as in Example 1, and the specific steps are as follows.

[0042] S3. Add 200g of octamethylcyclotetrasiloxane and 10.5g of organosilicon epoxy end-capping agent to the reaction flask, stir and heat, and add 0.16g of tetramethylammonium hydroxide ethanol solution (50wt%) catalyst at about 100℃; keep the reaction at 108℃ for 4 hours, and continue to heat to 145℃ for catalyst destruction reaction for 1 hour. Distill off the low-boiling substances under reduced pressure conditions not exceeding 1kPa to obtain a colorless or light-colored transparent epoxy-modified polysiloxane intermediate.

[0043] S4. Add 200g of the epoxy-modified polysiloxane intermediate obtained in step S3 and 11.8g of ammonium salt AYSO2 to a reaction flask. Under nitrogen protection, heat to 95°C. After the system becomes transparent, keep it at the temperature for 8 hours to obtain a yellow transparent viscous liquid, which is the branched block silicone oil.

[0044] Preparation of silicone emulsion: Take 100g of the above branched block silicone oil, 10g of isopropanol, 12.5g of isomeric alcohol polyoxyethylene ether TO5 and 12.5g of isomeric alcohol polyoxyethylene ether TO7 and add them to a beaker. Stir well, slowly add water in batches, and stir until the system has a certain fluidity. Then add 2g of acetic acid and stir for 10 minutes. Then slowly add the remaining water (total mass of water is 315g). After defoaming, filter to obtain a transparent light blue emulsion.

[0045] Example 4

[0046] In this embodiment, a medium molecular weight terminal epoxy-modified polysiloxane (number average molecular weight of about 6000 g / mol) is prepared and a branched block polysiloxane emulsion is prepared therefrom. The specific steps are as follows.

[0047] S1. Add 362.6g of organosilicon epoxy end-capping agent and 203g of diethylenetriamine to the reaction flask at a molar ratio of 1:2, introduce nitrogen gas, slowly raise the temperature to 100-120℃, and keep the reaction at this temperature for 8 hours to obtain an amino-terminated macromolecular monomer.

[0048] The preparation method is the same as in Example 1.

[0049] Example 5

[0050] In this embodiment, a medium molecular weight terminal epoxy-modified polysiloxane (number average molecular weight of about 8000 g / mol) is prepared and a branched block polysiloxane emulsion is prepared therefrom. The specific steps are as follows.

[0051] S1. Add 362.6g of organosilicon epoxy end-capping agent and 219g of triethylenetetramine to the reaction flask at a molar ratio of 1:1.5, purge with nitrogen, slowly heat to 100-120℃, and keep the reaction at this temperature for 8 hours to obtain an amino-terminated macromolecular monomer.

[0052] The preparation method is the same as in Example 1.

[0053] Example 6

[0054] In this embodiment, a medium molecular weight terminal epoxy-modified polysiloxane (number average molecular weight of about 10,000 g / mol) is prepared and a branched block polysiloxane emulsion is prepared therefrom. The specific steps are as follows.

[0055] S1. Add 362.6g of organosilicon epoxy end-capping agent and 393g of diallyltriamine to the reaction flask at a molar ratio of 1:3. Purge with nitrogen gas and slowly heat to 100-120℃. Maintain the temperature for 8 hours to obtain an amino-terminated macromolecular monomer.

[0056] The preparation method is the same as in Example 1.

[0057] Example 7

[0058] In this embodiment, polyether epoxy-modified polysiloxane is prepared as an intermediate for terminal epoxy-modified polysiloxane via hydrosilylation. The preparation method of ammonium salt water is the same as in Example 1, and the specific steps are as follows.

[0059] S3. Add 200g of terminal hydrogen polysiloxane with a number average molecular weight of 8000g / mol, 25.1g of allyl epoxy polyether (number average molecular weight of about 500g / mol) and 25.1g of isopropanol to the reaction flask, stir and heat, and add 0.09g of chloroplatinic acid catalyst at about 40℃.

[0060] After the reaction system becomes transparent, the temperature is raised to 80°C and kept at that temperature for 4 hours to obtain polyether epoxy-modified polysiloxane with a number average molecular weight of about 9000 g / mol, which serves as an intermediate for terminal epoxy-modified polysiloxane.

[0061] S4. Add 200g of the polyether epoxy-modified polysiloxane obtained in step S3 and 23.6g of ammonium salt water to a reaction flask, heat to 80°C under nitrogen protection, and keep the system transparent for 8 hours to obtain a yellow transparent viscous liquid, namely branched block silicone oil.

[0062] Preparation of silicone emulsion: Take 100g of the above branched block silicone oil and 25g of isomeric alcohol polyoxyethylene ether TO7 and add them to a beaker. Stir well and slowly add water in batches. Stir and disperse until the system has a certain fluidity. Then add 2g of acetic acid and stir for 10 minutes. Then slowly add the remaining water (total mass of water is 294g). After defoaming, filter to obtain a transparent light blue emulsion.

[0063] Comparative Example 1

[0064] In this comparative example, a commercially available polyetheramine (monoamine type, number average molecular weight of about 2000 g / mol) was used instead of the amino-terminated macromonomer of the present invention. It was reacted with an epoxy-modified polysiloxane with a number average molecular weight of about 8000 g / mol at 90°C for 8 hours to prepare a linear block polysiloxane. The emulsion was then prepared according to the method of preparing silicone emulsion in Example 1 to obtain a white opaque emulsion.

[0065] The branched block polysiloxane emulsions obtained in Examples 1-7 and Comparative Example 1 were used to treat knitted cotton fabrics according to the above finishing process, and the hand feel (smoothness, fluffiness) and hydrophilicity were tested. The results are shown in Table 1.

[0066] The hand feel evaluation was conducted using a touch method to assess the overall hand feel of the finished knitted cotton fabric. A 1-5 point rating system was used (1 being the worst and 5 being the best), with 5 people simultaneously evaluating and the average value taken. Hydrophilicity was expressed as the water droplet diffusion time (in seconds), with shorter times indicating better hydrophilicity. Finishing process: The fabric was impregnated with the working solution (30g / L polysiloxane emulsion), followed by a pre-baking stage at 170℃ for 15-45 seconds, and finally rehydrated for 2 hours.

[0067] Table 1. Results of hand feel and hydrophilicity tests on the treated knitted cotton fabrics of each embodiment and comparative example.

[0068]

[0069] As can be seen from Table 1, the fabrics treated with hyperbranched block polysiloxane emulsions obtained in Examples 1 to 7 have a smoothness score of 3 to 5 and a fluffiness score of 3 to 5, with an overall oily feel. The overall hand feel is significantly better than that of Comparative Example 1 (linear polyetheramine structure, smoothness score of 2 and fluffiness score of 2).

[0070] The above data indicate that the hyperbranched topology constructed by the present invention using amino-terminated macromonomers containing organosilicon segments as capping agents achieves an unexpectedly significant improvement in overall tactile properties compared to traditional linear block polysiloxanes. Furthermore, the emulsions in Examples 1-7 are transparent to pale blue in appearance, with significantly better transparency than the opaque white emulsion in Comparative Example 1, further demonstrating that the introduction of organosilicon segments into the macromonomer significantly improves the interaction between the capping agent and the polysiloxane substrate.

[0071] In S1, the molar ratio of the organosilicon epoxy end-capping agent to the polyamine can be adjusted within the range of 1:1.5 to 3. When the molar ratio is lower than 1:1.5, the residual active amino groups in the macromonomer are insufficient, making it difficult to form an effective hyperbranched structure with the terminal epoxy-modified polysiloxane. When the molar ratio is higher than 1:3, the content of free polyamine increases, affecting the stability of the ammonium salt intermediate. The preferred molar ratio is 1:2. In S2, the molar ratio of the amino-terminated macromonomer to the active organic acid group can be adjusted within the range of 1:0.8 to 1.2. When the amount of organic acid is lower than 0.8 equivalents, some amino groups exist in the form of free amines, resulting in a higher pH of the ammonium salt intermediate and a decrease in system compatibility when reacting with the terminal epoxy-modified polysiloxane. When the amount of organic acid is higher than 1.2 equivalents, the system becomes acidic, which may affect the reaction efficiency of the subsequent step S4. The preferred molar ratio is 1:1.

[0072] In Examples 1-7, the polyamine described in S1 is not limited to tetramethyldipropylenetriamine, but can also be other aliphatic polyamines containing at least three amino active hydrogens, such as diethylenetriamine (DETA), triethylenetetramine (TETA), tetraethylenepentamine (TEPA), and dipropylenetriamine, etc., all of which can be used to prepare amino-terminated macromonomers with multifunctionality, thereby constructing hyperbranched topologies. Among the above polyamines, tetramethyldipropylenetriamine is preferred, as it has the best compatibility with organosilicon segments and produces a macromonomer system with good uniformity.

[0073] The organic acid mentioned in S2 is not limited to the combination of lauric acid and acetic acid. It can also be oleic acid or citric acid used alone or in combination with acetic acid or lauric acid. All of these can achieve the ammonium salting of amino-terminated macromonomers to prepare ammonium salt intermediates.

[0074] The organosilicon cyclic compounds in S3 are not limited to octamethylcyclotetrasiloxane. Low molecular weight linear polydimethylsiloxane can also be used as a raw material. By adjusting the feeding ratio of S3 to epoxy-based polysiloxane end-capping agent, terminal epoxy-modified polysiloxane intermediates with different number average molecular weights can also be prepared.

[0075] When preparing silicone emulsions, the emulsifier is not limited to a single type. The mixed use of isomeric alcohol polyoxyethylene ethers TO5 and TO7 can further improve the stability of the emulsion and is beneficial to the adjustment of hydrophilicity. The emulsifier can also be one or more of isomeric tridecyl alcohol polyoxyethylene ether or acetylenic diol polyoxyethylene ether.

[0076] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for synthesizing a branched block silicone oil, characterized in that, Includes the following steps: S1. React organosilicon epoxy end-capping agent and polyamine in a molar ratio of 1:(1.5-3) at 100-150℃ for 4-8 hours under nitrogen protection to prepare amino-terminated macromonomers. S2. The amino-terminated macromonomer prepared in step S1 is reacted with organic acid and water at 30-80℃ for 4-8 hours to prepare an ammonium salt intermediate; the molar ratio of the amino-terminated macromonomer to the active group of the organic acid is 1:(0.8-1.2). S3. Polydimethylsiloxane cyclic or linear polydimethylsiloxane is reacted with an epoxy-based polysiloxane end-capping agent under alkaline catalyst and subjected to a chain extension reaction to obtain an epoxy-modified polysiloxane intermediate. S4. The terminal epoxy-modified polysiloxane intermediate prepared in step S3 and the ammonium salt water intermediate prepared in step S2 are reacted at 80-100℃ for 6-10 hours under nitrogen protection in a molar ratio of 1:0.5-2 to obtain branched block silicone oil.

2. The method for synthesizing a branched block silicone oil according to claim 1, characterized in that, In S1, the polyamine is selected from one or more of tetramethyldipropylenetriamine, diethylenetriamine, triethylenetetramine, and dipropylenetriamine.

3. The method for synthesizing a branched block silicone oil according to claim 1, characterized in that, In S2, the organic acid is one or more of acetic acid, lauric acid, oleic acid, and citric acid.

4. The method for synthesizing a branched block silicone oil according to claim 1, characterized in that, In S3, the number-average molecular weight of the epoxy-terminated modified polysiloxane intermediate is 6000-25000 g / mol.

5. The method for synthesizing a branched block silicone oil according to claim 1, characterized in that, In S3, the alkaline catalyst is a tetramethylammonium hydroxide ethanol solution with a concentration of 50 wt%, and the mass ratio of the tetramethylammonium hydroxide ethanol solution to polydimethylsiloxane cyclic or linear polydimethylsiloxane is (0.0005-0.001):

1. After the chain extension reaction is completed, the temperature is raised to 140-150℃ for catalyst breaking reaction, and low-boiling substances are removed by distillation under reduced pressure not exceeding 1 kPa.

6. The method for synthesizing a branched block silicone oil according to claim 1, characterized in that, In S3, the polydimethylsiloxane cyclic compound is octamethylcyclotetrasiloxane, and the number-average molecular weight of the epoxy-based polysiloxane end-capping agent is 1000 g / mol.

7. The method for synthesizing a branched block silicone oil according to claim 1, characterized in that, In step S3, a polyether-modified polysiloxane is prepared by hydrosilylation reaction of a terminal hydrogen polysiloxane and an allyl epoxy polyether at 40-80°C under the catalysis of a chloroplatinic acid catalyst, wherein the mass ratio of the chloroplatinic acid catalyst to the terminal hydrogen polysiloxane is (0.003-0.004):

1. This polyether-modified polysiloxane serves as an intermediate for the terminal epoxy modified polysiloxane.

8. The method for synthesizing a branched block silicone oil according to claim 1, characterized in that, In step S4, the process is carried out under conditions where there is no solvent or where one or more of isopropanol, ethylene glycol monobutyl ether, dipropylene glycol butyl ether, and isohexyl glycol are used as solvents.

9. An application of a branched block silicone oil according to any one of claims 1-8, characterized in that, Organosilicon emulsions were prepared using branched block silicone oil.

10. The application of a branched block silicone oil according to claim 9, characterized in that, The specific steps for preparing the organosilicon emulsion are as follows: mix the branched block silicone oil and emulsifier evenly, add water in batches until the system is fluid, add acetic acid, continue to add the remaining water, defoam and filter to obtain the branched block polysiloxane emulsion. The emulsifier is one or more of isotridecyl alcohol polyoxyethylene ether, acetylacetonate diol polyoxyethylene ether, and isodecyl alcohol polyoxyethylene ether, and the amount of emulsifier used is 25 wt% of the block polysiloxane mass; A diluent is also added when preparing the silicone emulsion. The diluent is one or more of isopropanol, ethylene glycol monobutyl ether, dipropylene glycol butyl ether, and isohexyl glycol.

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