Preparation method of organic silicon composition

Abstract

The invention relates to a preparation method of an organic silicon composition, which comprises the following steps: introducing micromolecular hydroxyl silicone oil in the preparation process to react with part of Si-H bonds in hydrogen-containing silicone oil to remove hydrogen so as to obtain polysiloxane which is connected through T chain links and has a spatial net structure; the preparation method comprises the following steps: firstly, adding alkyl-modified polysiloxane into a solvent, then reacting with alpha-olefin under the action of an acid catalyst to obtain alkyl-modified polysiloxane, finally adding silicon resin filler dissolved in the solvent, and preserving heat to obtain the alkyl-modified organosilicon composition with the MDT structure. Therefore, the effect of quickly defoaming is achieved; meanwhile, the structure has good high and low temperature resistance and shear resistance, and has more lasting foam inhibition capacity; meanwhile, the introduction of the alkyl group endows the composition with certain compatibility with a foaming system, and the effect of not influencing the foaming system is achieved.

Description

Technical Field

[0001] The invention relates to a method for preparing an organosilicon composition. The organosilicon defoaming composition belongs to fine chemicals, so the invention belongs to the technical field of fine chemical preparations. Background Art

[0002] Foaming is a common phenomenon in life and production, especially in large-scale industrial production. The generation of a large amount of foam seriously affects the production process, such as reducing the working efficiency of production equipment, delaying the working time of production personnel, and affecting the quality of production products. The methods of eliminating harmful foam can be divided into physical methods and chemical methods. The use of defoaming agents is one of the chemical methods. With the substantial increase in industrial production scale and production efficiency, defoaming agents have been more widely promoted and applied. At present, defoaming agents have been widely used in papermaking, textile printing and dyeing, oil extraction and refining, coatings, emulsion polymerization, sewage treatment, metal cleaning, solid and liquid detergents and other industries. Defoaming agents have become an indispensable functional additive in the production process.

[0003] At present, defoamers on the market are classified by active ingredients, mainly including polyethers, silicones, mineral oils, fatty alcohols and other polymers, etc. Among them, silicone defoamers are widely favored by consumers due to their stable chemical properties, few side effects and strong defoaming and decompression properties.

[0004] The silicone composition is the core component of silicone defoamers. Its defoaming speed and antifoaming performance directly affect the performance of the final product. The original silicone composition was prepared by polydimethylsiloxane and silicon dioxide through a specific processing technology. For example, the defoamer composition introduced in GB1051687A is prepared by heating polydimethylsiloxane and hydrophilic silicon dioxide, but its antifoaming performance is poor. Therefore, researchers at home and abroad have conducted large-scale expansion research on its performance. For example, DE-OS2925722 uses hydrophobic silicon dioxide instead of hydrophilic silicon dioxide; US-A4145308 introduces (CH3)3SiO 1 / 2and SiO2 units; US4395352 describes an antifoaming agent composition containing a high-viscosity polydimethylsiloxane fluid and finely dispersed hydrophobic particles, which can be used as a defoaming agent itself or in the form of an emulsion; US3691091 discloses an organosilicon emulsion of an aqueous liquid defoaming agent, wherein the organosilicon consists of a polydimethylsiloxane fluid, silicon dioxide, and an organosilicon compound or oligomer containing an alkoxy group and / or a silanol group; EP0163541 discloses a method for preparing an organosilicon defoaming agent by reacting a mixture of components including a preformed polyorganosiloxane polymer with one or more hydroxyl groups and / or hydrocarbon oxygen groups, an organosilicon resin, a filler, and a catalyst for promoting the reaction; EP-A-578424 prepares a foam control agent using a polydiorganosiloxane having a part of its side chains as a long-chain alkyl group, each of which contains 9-35 carbon atoms. The above patents all mention non-crosslinked silicone polymers, and such compositions have poor foam suppression performance in the later stage and are easy to decay.

[0005] In order to improve the late foaming performance of silicone compositions, EP163541B1, CN102698475A, and CN104274998A introduce the use of terminal hydroxyl-containing polysiloxanes to react with polysiloxanes containing other active functional groups under the action of a catalyst to form branched polysiloxanes, and use this to replace ordinary polysiloxanes and hydrophilic silica for mixed treatment. The resulting silicone defoaming composition has a high viscosity and good foaming performance, but it is difficult to emulsify and disperse it in water. US5153258 introduces the introduction of slightly cross-linked polysiloxanes into the system to improve the defoaming and defoaming performance of the composition, such as cross-linking reactions between vinyl polysiloxanes and hydrogen-containing polysiloxanes, hydroxyl-containing polysiloxanes and alkyl silicates under the action of a catalyst, but the degree of cross-linking is difficult to control. US5486306 introduces a defoamer synthesized by directly reacting hydrogen-containing polyorganosiloxane and α-olefin. The synthesis process is simple, but the defoamer obtained has poor defoaming performance and is only used in washing powder. Silicon spots are easily generated when it comes into contact with fabrics. WO2007137948A1 introduces the addition of trimethylsiloxy-terminated polydimethylsiloxane to dilute the hydrogen-containing polyorganosiloxane and vinyl polyorganosiloxane after reaction. However, the contribution of the diluent to the defoaming performance is small, and when the hydrogen-containing polyorganosiloxane and vinyl polyorganosiloxane react, the viscosity is large and difficult to control, and the defoamer composition obtained has poor defoaming and defoaming performance. Summary of the invention

[0006] The invention relates to a method for preparing an organosilicon composition. During the preparation process, small molecular hydroxy silicone oil is introduced to react with part of Si-H bonds in hydrogen-containing silicone oil to remove hydrogen, thereby obtaining a polysiloxane with a spatial network structure connected by T segments, and then reacting with alpha-olefin under the action of an acidic catalyst to obtain an alkyl-modified polysiloxane. Finally, a silicone resin filler dissolved in a solvent is added, and the mixture is kept warm to obtain an alkyl-modified organosilicon composition with an MDT structure. The organosilicon composition not only has low surface tension and chain flexibility, but can also spread rapidly, thereby achieving a rapid defoaming effect. Meanwhile, the structure has good high and low temperature resistance and shear resistance, and has a more lasting ability to suppress foam. Meanwhile, the introduction of the alkyl group gives the composition a certain compatibility with a foaming system, thereby achieving the effect of not affecting the foaming system itself.

[0007] The organosilicon composition of the present invention is composed of the following substances: A. Small molecule hydroxy silicone oil At least one of the general structural formulas is as follows: HO[(CH3)2SiO] m H The subscript m is an integer of 20-80, and the amount of the small molecule hydroxy silicone oil is 10-20% of the total mass of the organic silicon composition; B. Hydrogen-containing polysiloxane At least one of the general structural formulas is as follows: Me 3SiO(R 1 HSiO) b (R 1 2SiO) c Si Me 3 In the formula, the substituent R 1 are the same or different and are alkyl groups having 1 to 4 carbon atoms, specifically selected from methyl, ethyl, n-propyl, n-butyl, isobutyl; preferably R 1 is methyl; subscript b is an integer between 10 and 100; subscript c The amount of hydrogen-containing polysiloxane is 30-60% of the total mass of the organosilicon composition; C. α-olefins The α-olefin is a mixture of any one or more of linear α-olefins, α-aromatic olefins or branched α-olefins, selected from α-octene, α-decene, α-dodecene, α-tetradecene, α-hexadecene, α-octadecene, α-eicosene, a C20-C24 linear α-olefin mixture, a C24-C28 linear α-olefin mixture, α-triacontene, α-methylstyrene, α-styrene, and can be used alone or in any proportion; the amount of the α-olefin is 20-50% of the total mass of the organosilicon composition; D. MQ silicone resin The MQ silicone resin is composed of chain segments (CH3)3SiO l / 2 (M unit) and chain SiO 4 / 2 The MQ resin composed of (Q unit) and the molar ratio between the two is (0.4-1.2):1.0, and the amount used accounts for 2-10% of the total mass of the organosilicon composition; E. Solvent The solvent is used to dissolve the MQ silicone resin in advance, and is selected from one or more of diisooctyl phthalate, dimethyl phthalate, dibutyl phthalate, tributyl phosphate, dioctyl adipate, dioctyl azelate, and dioctyl sebacate; the amount used accounts for 2-10% of the total mass of the organosilicon composition; F. Catalyst 1 The catalyst 1 is selected from platinum-alcohol complex, platinum-olefin complex, platinum-alkoxide complex, platinum-ether complex, platinum-ketone complex, chloroplatinic acid isopropanol solution, platinum-vinyl complex, preferably chloroplatinic acid isopropanol solution; the amount of the catalyst 1 is 3-20 ppm (in terms of platinum) of the total mass of the small molecule hydroxy silicone oil A, hydrogen-containing polyorganosiloxane B, and α-olefin C; G. Catalyst 2 The catalyst 2 is selected from sodium hydroxide, potassium hydroxide, cesium hydroxide, tetramethylammonium hydroxide, sodium ethoxide, diethanolamine, triethanolamine, and potassium organic silicon oxide. Potassium hydroxide is preferred; the amount of the catalyst 2 is 0.1%-2% of the total mass of the small molecule hydroxy silicone oil A and the hydrogen-containing polyorganosiloxane B.

[0008] The preparation method of the organosilicon composition of the present invention is as follows: (1) Weigh a specified amount of MQ silicone resin and solvent, dissolve and stir evenly to form a mixture M for later use; (2) adding small molecule hydroxy silicone oil, hydrogen-containing polyorganosiloxane, and catalyst 2 into a reactor, mixing and heating, and reacting at 60-120° C. for 2-4 hours to form polysiloxane N; (3) adding α-olefin and catalyst 1 to the polysiloxane N obtained in step (2) to continue the reaction, raising the temperature to 60-140° C. and keeping the temperature for 0.5-1.5 h to obtain terminal alkyl polysiloxane Y; (4) Add the mixture M to the terminal alkyl polysiloxane Y obtained in step (3), keep the mixture at 100-160° C. for 1-5 hours, and cool it to room temperature to obtain the organosilicon composition.

[0009] A method for preparing an organic silicone emulsion using the above organic silicone composition is implemented by: mixing the organic silicone composition and an emulsifier, and gradually adding water and a thickener, mixing them evenly, and then passing them through mechanical equipment such as a colloid grinder and a homogenizer to prepare an oil-in-water organic silicone emulsion.

[0010] The emulsifier is a nonionic surfactant selected from nonylphenol polyoxyethylene ether, octylphenol polyoxyethylene ether, lauric acid polyoxyethylene ether, oleic acid polyoxyethylene ether, sorbitan monostearate, sorbitan monooleate, sorbitan tristearate, sorbitan trioleate, sorbitan monostearate polyoxyethylene ether ester, sorbitan monooleate polyoxyethylene ether ester, sorbitan tristearate polyoxyethylene ether ester, and castor oil polyoxyethylene ether. DETAILED DESCRIPTION Example 1

[0012] (1) Weigh 10 g of MQ silicone resin (the molar ratio of M to Q is 0.4:1.0) and 10 g of diisooctyl phthalate, dissolve and stir evenly to form a mixture M1 for later use; (2) 10g of small molecule hydroxy silicone oil HO[(CH3)2SiO] 20 H, 30g hydrogen-containing polyorganosiloxane Me3SiO[(CH3)HSiO] 10 [(CH3)2SiO] 100 SiMe3 and 0.6 g potassium hydroxide were added to the reactor, mixed and heated, and kept at 60°C for 4 h to form polysiloxane N1; (3) Add 40 g of α-hexadecene and 3 ppm of chloroplatinic acid isopropanol solution to the polysiloxane N1 obtained in step (2), continue the reaction, raise the temperature to 100° C., and keep the temperature for 1.5 h to obtain terminal alkyl polyorganosiloxane Y1; (4) The mixture M1 is further added to the terminal alkyl polysiloxane Y1 obtained in step (3), and the mixture is kept at 100° C. for 5 h and cooled to room temperature to obtain an organosilicon composition. Example 2

[0013] (1) Weigh 2 g of MQ silicone resin (the molar ratio of M to Q is 0.6:1.0), 8 g of a mixture of dimethyl phthalate and dibutyl phthalate, dissolve and stir evenly to form a mixture M2 for later use; (2) 20g of small molecule hydroxy silicone oil HO[(CH3)2SiO] 40 H, 40g hydrogen-containing polyorganosiloxane Me3SiO[(CH3)HSiO] 50 [(CH3)(C2H5)SiO] 50SiMe3 and 0.06 g of sodium hydroxide were added to the reactor, mixed and heated, and kept at 80°C for 3 h to form polysiloxane N2; (3) Add 30 g of a mixture of α-dodecene and α-tetradecene and 5 ppm of a platinum-alcohol complex to the polysiloxane N2 obtained in step (2), continue the reaction, raise the temperature to 60° C., and keep the temperature for 1 hour to obtain an alkyl-terminated polyorganosiloxane Y2; (4) The mixture M2 is further added to the terminal alkyl polysiloxane Y2 obtained in step (3), and the mixture is kept at 140° C. for 4 h and cooled to room temperature to obtain an organosilicon composition. Example 3

[0014] (1) Weigh 2 g MQ silicone resin (the molar ratio of M to Q is 0.8:1.0) and 8 g tributyl phosphate, dissolve and stir evenly to form a mixture M3 for later use; (2) 10g of small molecule hydroxy silicone oil HO[(CH3)2SiO] 60 H, 60g hydrogen-containing polyorganosiloxane Me3SiO[(CH3)HSiO] 80 [(CH3)(C4H9)SiO] 200 SiMe3 and 0.7 g of diethanolamine were added to the reactor, mixed and heated, and kept at 100°C for 3 h to form polysiloxane N3; (3) adding 20 g of a mixture of α-octene and α-decene and 10 ppm of a platinum-olefin complex to the polysiloxane N3 obtained in step (2) to continue the reaction, raising the temperature to 80° C. and keeping the temperature for 1.5 h to obtain an alkyl-terminated polyorganosiloxane Y3; (4) The mixture M3 is further added to the terminal alkyl polysiloxane Y3 obtained in step (3), and the mixture is kept at 130° C. for 2 h and cooled to room temperature to obtain an organosilicon composition. Example 4

[0015] (1) Weigh 7 g of MQ silicone resin (the molar ratio of M to Q is 1.0:1.0), 8 g of a mixture of dioctyl adipate and dioctyl azelate, dissolve and stir evenly to form a mixture M4 for later use; (2) 15 g of small molecule hydroxy silicone oil HO[(CH3)2SiO] 80 H, 40g hydrogen-containing polyorganosiloxane Me3SiO[(C2H5)HSiO] 20 [(CH3)2SiO] 10 SiMe3 and 0.3 g of potassium organosiloxane were added to the reactor, mixed and heated, and kept at 120°C for 2 h to form polysiloxane N4; (3) Add 30 g of α-methylstyrene and α-styrene mixture and 15 ppm of platinum-alkoxide complex to the polysiloxane N4 obtained in step (2) to continue the reaction, raise the temperature to 100° C., and keep the temperature for 1.5 h to obtain terminal alkyl polyorganosiloxane Y4; (4) The mixture M4 is further added to the terminal alkyl polysiloxane Y4 obtained in step (3), and the mixture is kept at 160° C. for 1 h and cooled to room temperature to obtain an organosilicon composition. Example 5

[0016] (1) Weigh 5 g of MQ silicone resin (the molar ratio of M to Q is 1.2:1.0) and 5 g of dioctyl sebacate, dissolve and stir evenly to form a mixture M5 for later use; (2) 10g of small molecule hydroxy silicone oil HO[(CH3)2SiO] 30 H, 50g hydrogen-containing polyorganosiloxane Me3SiO[(C2H5)HSiO] 50 [(C2H5)2SiO] 100 SiMe3 and 0.6 g of tetramethylammonium hydroxide were added to the reactor, mixed and heated, and kept at 110°C for 3 h to form polysiloxane N5; (3) Add 30 g of a C24-C28 linear α-olefin mixture and 20 ppm of a platinum-vinyl complex to the polysiloxane N5 obtained in step (2), continue the reaction, raise the temperature to 120° C., and keep the temperature for 1 hour to obtain an alkyl-terminated polyorganosiloxane Y5; (4) The mixture M5 is further added to the terminal alkyl polysiloxane Y5 obtained in step (3), and the mixture is kept at 150° C. for 3 h and cooled to room temperature to obtain an organosilicon composition. Example 6

[0017] (1) Weigh 4 g of MQ silicone resin (the molar ratio of M to Q is 0.5:1.0) and 6 g of dioctyl adipate, dissolve and stir evenly to form a mixture M6 for later use; (2) 10g of small molecule hydroxy silicone oil HO[(CH3)2SiO] 50 H, 30g hydrogen-containing polyorganosiloxane Me3SiO[(CH3)HSiO] 100 [(CH3)2SiO] 30 SiMe3 and 0.6 g of cesium hydroxide were added to the reactor, mixed and heated, and kept at 90°C for 3 h to form polysiloxane N6; (3) adding 50 g of α-triacontene and 6 ppm of platinum-ketone complex to the polysiloxane N6 obtained in step (2) to continue the reaction, raising the temperature to 140° C. and keeping the temperature for 0.5 h to obtain terminal alkyl polyorganosiloxane Y6; (4) The mixture M6 is further added to the terminal alkyl polysiloxane Y6 obtained in step (3), and the mixture is kept at 130° C. for 2 h and cooled to room temperature to obtain an organosilicon composition.

[0018] Comparative Example 1 (1) 10g of small molecule hydroxy silicone oil HO[(CH3)2SiO] 20 H, 30g hydrogen-containing polyorganosiloxane Me3SiO[(CH3)HSiO] 10 [(CH3)2SiO] 100 SiMe3 and 0.6 g potassium hydroxide were added to the reactor, mixed and heated, and kept at 60°C for 4 h to form polysiloxane N1; (2) Add 40 g of α-hexadecene and 3 ppm of chloroplatinic acid isopropanol solution to the polysiloxane N1 obtained in step (1), continue the reaction, raise the temperature to 100° C., and keep the temperature for 1.5 h to obtain terminal alkyl polyorganosiloxane Y1; (3) 10 g of MQ silicone resin (the molar ratio of M to Q is 0.4:1.0) and 10 g of diisooctyl phthalate were added to the terminal alkyl polysiloxane Y1 obtained in step (2), and the mixture was kept at 100° C. for 5 h and cooled to room temperature to obtain an organosilicon composition. Comparative Example 2

[0019] (1) 20g of small molecule hydroxy silicone oil HO[(CH3)2SiO] 40 H, 40g hydrogen-containing polyorganosiloxane Me3SiO[(CH3)HSiO] 50 [(CH3)(C2H5)SiO] 50 SiMe3 and 0.06 g of sodium hydroxide were added to the reactor, mixed and heated, and kept at 80°C for 3 h to form polysiloxane N2; (2) adding 30 g of a mixture of α-dodecene and α-tetradecene and 5 ppm of a platinum-alcohol complex to the polysiloxane N2 obtained in step (1) to continue the reaction, raising the temperature to 60° C. and keeping the temperature for 1 h to obtain an alkyl-terminated polyorganosiloxane Y2; (3) 10 g of MQ silicone resin (the molar ratio of M to Q is 0.6:1.0) was further added to the terminal alkyl polysiloxane Y2 obtained in step (2), and the mixture was kept at 140° C. for 4 h and cooled to room temperature to obtain an organosilicon composition. Comparative Example 3

[0020] (1) Weigh 2 g MQ silicone resin (the molar ratio of M to Q is 0.8:1.0) and 8 g tributyl phosphate, dissolve and stir evenly to form a mixture M3 for later use; (2) 10g of small molecule hydroxy silicone oil HO[(CH3)2SiO] 200H, 60g hydrogen-containing polyorganosiloxane Me3SiO[(CH3)HSiO] 80 [(CH3)(C4H9)SiO] 200 SiMe3 and 0.7 g of diethanolamine were added to the reactor, mixed and heated, and kept at 100°C for 3 h to form polysiloxane N7; (3) Add 20 g of a mixture of α-octene and α-decene and 10 ppm of a platinum-olefin complex to the polysiloxane N7 obtained in step (2), continue the reaction, raise the temperature to 80° C., and keep the temperature for 1.5 h to obtain an alkyl-terminated polyorganosiloxane Y7; (4) The mixture M3 is further added to the terminal alkyl polysiloxane Y7 obtained in step (3), and the mixture is kept at 130° C. for 2 h and cooled to room temperature to obtain an organosilicon composition. Comparative Example 4

[0021] (1) Weigh 2 g MQ silicone resin (the molar ratio of M to Q is 0.8:1.0) and 8 g tributyl phosphate, dissolve and stir evenly to form a mixture M3 for later use; (2) 60g of small molecule hydroxy silicone oil HO[(CH3)2SiO] 200 H, 10g hydrogen-containing polyorganosiloxane Me3SiO[(CH3)HSiO] 10 [(CH3)(C4H9)SiO] 200 SiMe3 and 0.7 g of diethanolamine were added to the reactor, mixed and heated, and kept at 100°C for 3 h to form polysiloxane N8; (3) adding 20 g of a mixture of α-octene and α-decene and 10 ppm of a platinum-olefin complex to the polysiloxane N8 obtained in step (2) to continue the reaction, raising the temperature to 80° C. and keeping the temperature for 1.5 h to obtain an alkyl-terminated polyorganosiloxane Y8; (4) The mixture M3 was further added to the terminal alkyl polysiloxane Y8 obtained in step (3), and the mixture was kept at 130° C. for 2 h and cooled to room temperature to obtain the organosilicon composition. Embodiments 7 to 16

[0022] According to the well-known emulsion defoamer preparation technology in the technical field, the silicone composition of Examples 1 to 6 and Comparative Examples 1 to 4 were used to prepare emulsion defoamers K1 to K6 and L1 to L4, respectively. The preparation method is as follows: 100 g of an organosilicon defoaming composition, 30 g of sorbitan monostearate (span 60) and 20 g of polyoxyethylene (20) sorbitan monostearate were mixed at 70° C. for 10 minutes, and 500 g of water was added in batches; then 2 g of polyacrylic acid was added to the mixture, and the pH was adjusted to 6-7 with 10% NaOH, followed by adding 345 g of water; finally, the emulsion was homogenized with a high-pressure homogenizer, and the pH was adjusted to 6-7 with 10% NaOH again, and then 3 g of an isothiazolinone-based preservative was added to obtain emulsion defoamers K1-K6 and L1-L4.

[0023] Defoamer performance test Textile Slurry Testing Test method: Take a 250ml stoppered measuring cylinder and add 160ml of prepared textile pulp, then add 0.05g of emulsion defoamer, shake the bottle up and down at a speed of 2s / time, shake each group of bottles 10 times, and record the defoaming time of each group. The shorter the defoaming time in each group of shaking bottles, the better the defoaming and defoaming performance of the defoamer sample.

[0024]

[0025] It can be seen that in the textile slurry test, the defoaming time of the first to sixth groups of emulsion defoamers K1 to K6 prepared by Examples 1 to 6 is shorter than that of the emulsion defoamers L1 to L5 prepared by Comparative Examples 1 to 4. Therefore, the organosilicon composition has good defoaming and anti-foaming performance in the textile slurry system, as well as late anti-attenuation performance.

Claims

1. A method for preparing an organosilicon composition, characterized in that: It is composed of the following components: A. Small molecule hydroxy silicone oil At least one of the general structural formulas is as follows: HO[(CH3)2SiO] m H The subscript m is an integer of 20-80, and the amount of the small molecule hydroxy silicone oil is 10-20% of the total mass of the organic silicon composition; B. Hydrogen-containing polysiloxane At least one of the general structural formulas is as follows: Me 3SiO(R 1 HSiO) b (R 1 2SiO) c Si Me 3 In the formula, the substituent R 1 are the same or different and are alkyl groups having 1 to 4 carbon atoms, specifically selected from methyl, ethyl, n-propyl, n-butyl, isobutyl; b is an integer between 10 and 100; subscript c The amount of hydrogen-containing polysiloxane is 30-60% of the total mass of the organosilicon composition; C. α-olefins The α-olefin is a mixture of any one or more of linear α-olefins, α-aromatic olefins or branched α-olefins, selected from α-octene, α-decene, α-dodecene, α-tetradecene, α-hexadecene, α-octadecene, α-eicosene, a C20-C24 linear α-olefin mixture, a C24-C28 linear α-olefin mixture, α-triacontene, α-methylstyrene, α-styrene, and can be used alone or in any proportion; the amount of the α-olefin is 20-50% of the total mass of the organosilicon composition; D. MQ silicone resin The MQ silicone resin is composed of chain segments (CH3)3SiO l / 2 (M unit) and chain SiO 4 / 2 The MQ resin composed of (Q unit) and the molar ratio between the two is (0.4-1.2):1.0, and the amount used accounts for 2-10% of the total mass of the organosilicon composition; E. Solvent The solvent is used to dissolve the MQ silicone resin in advance, and is selected from one or more of diisooctyl phthalate, dimethyl phthalate, dibutyl phthalate, tributyl phosphate, dioctyl adipate, dioctyl azelate, and dioctyl sebacate; the amount used accounts for 2-10% of the total mass of the organosilicon composition; F. Catalyst 1 The catalyst 1 is selected from platinum-alcohol complex, platinum-olefin complex, platinum-alkoxide complex, platinum-ether complex, platinum-ketone complex, chloroplatinic acid isopropanol solution, platinum-vinyl complex; the amount of the catalyst 1 is 3-20 ppm (in terms of platinum) of the total mass of small molecule hydroxy silicone oil A, hydrogen-containing polyorganosiloxane B, and α-olefin C; G. Catalyst 2 The catalyst 2 is selected from sodium hydroxide, potassium hydroxide, cesium hydroxide, tetramethylammonium hydroxide, sodium ethoxide, diethanolamine, triethanolamine, and potassium organic silicon oxide; the amount of the catalyst 2 is 0.1%-2% of the total mass of the small molecule hydroxy silicone oil A and the hydrogen-containing polyorganosiloxane B; The preparation method of the organosilicon composition is as follows: (1) Weigh a specified amount of MQ silicone resin and solvent, dissolve and stir evenly to form a mixture M for later use; (2) adding small molecule hydroxy silicone oil, hydrogen-containing polyorganosiloxane, and catalyst 2 into a reactor, mixing and heating, and reacting at 60-120° C. for 2-4 hours to form polysiloxane N; (3) adding α-olefin and catalyst 1 to the polysiloxane N obtained in step (2) to continue the reaction, raising the temperature to 60-140° C. and keeping the temperature for 0.5-1.5 h to obtain terminal alkyl polysiloxane Y; (4) Add the mixture M to the terminal alkyl polysiloxane Y obtained in step (3), keep the mixture at 100-160° C. for 1-5 hours, and cool it to room temperature to obtain the organosilicon composition.

2. The method for preparing a silicone composition according to claim 1, characterized in that: R 1 It is methyl.

3. The method for preparing a silicone composition according to claim 1, characterized in that: The catalyst 1 is a chloroplatinic acid isopropanol solution.

4. The method for preparing a silicone composition according to claim 1, characterized in that: The catalyst 2 is potassium hydroxide.

Images