MTQ type branched intermediate, branched organosilicone polysiloxane, and preparation method and application of MTQ type branched intermediate and branched organosilicone polysiloxane

Abstract

The invention discloses an MTQ type branched intermediate, branched organosilicone polysiloxane as well as a preparation method and an application of the MTQ type branched intermediate and the branched organosilicone polysiloxane. The structural composition of the MTQ type branched intermediate is represented by the following formula: (RaRbRcSiO1 / 2) m (RdSiO3 / 2) t (SiO4 / 2) q, in the formula, Ra, Rb, Rc and Rd are respectively and independently selected from-H,-CH2 = CH2,-CH3,-C6H5,-OCH3 and-OCH2CH3; m, t and q respectively represent the polymerization degree of each structural unit, the value range of m is 1-48, the value range of t is 1-10, and the value range of q is 1-8. The MTQ type branched organosilicone polysiloxane provided by the invention has the characteristics of high molecular weight and low viscosity, meanwhile, the branching degree of the internal structure of the composition is high, and compared with linear raw rubber with the same molecular weight, the influence on the viscosity of a release main agent is small when the addition amount is the same; meanwhile, the atomization degree of the release main agent can be reduced, and the atomization problem of the release main agent in the high-speed roller coating process is solved.

Description

Technical Field

[0001] This invention belongs to the field of organosilicon materials technology, specifically relating to an MTQ-type branched intermediate, a branched organosilicon polysiloxane, its preparation method, and its application. Background Technology

[0002] In the silicone coating process, when applying silicone to films or paper using roller coating, the industry is constantly increasing coating speeds to accelerate production. When the belt speed exceeds 350 m / min, droplets form on the coating machine. These droplets cause material loss, uneven coating, and can also affect people's respiratory system. Adding anti-fogging agents can reduce spray formation.

[0003] Patent CN101688010A involves adding a substance containing the chemical formula (SiO) 4 / 2 (R) a R b 2SiO 1 / 2 ) x The unit contains siloxane to achieve an anti-fogging effect. However, this additive functions similarly to 110 raw rubber, controlling the anti-fogging effect by increasing the viscosity of the anti-fogging agent, but the anti-fogging effect is very limited.

[0004] In patent CN179009C, a side-containing hydrogen silicone oil and an end-vinyl silicone oil are used, with the end-vinyl silicone oil and the hydrogen silicone oil undergoing an addition reaction. An excess of hydrogen silane is used to control the viscosity and degree of reaction of the polymer. This approach only increases the degree of crosslinking in the composition, and this degree of crosslinking is difficult to control. Furthermore, as described, the prepared composition has a lower viscosity, but while reducing atomization, it is prone to migration from the system, thus affecting properties such as residual adhesion. In addition, this approach requires the addition of inhibitors to control the stability of the composition; otherwise, it will gel or crosslink over time.

[0005] Patent CN101891892A describes the preparation of branched polydimethylsiloxane-polyoxyethylene copolymer and its use as an anti-fogging additive. This method uses polyether silicone oil as an anti-fogging agent. The main drawback is the poor solubility of both polyether silicone oil and silicone oil; when added to crosslinkable coating compositions, it easily causes turbidity, which is detrimental to reducing haze.

[0006] Therefore, it is particularly important to provide a high molecular weight organosilicon composition with high branching degree that can ensure product stability without the addition of inhibitors to reduce atomization effect. Summary of the Invention

[0007] To address the above technical problems, this invention first designs an MTQ-type branched intermediate, and then prepares a high-molecular-weight branched organosilicon polysiloxane with a high degree of branching, low gelation, and easy control based on the ring-opening polymerization reaction of the intermediate and organosilicon cyclamate. Using this branched organosilicon polysiloxane as an anti-fogging agent can solve the atomization problem of release agent during high-speed roller coating.

[0008] Based on the above design, this invention proposes an MTQ-type branched intermediate, a branched organosilicon polysiloxane, its preparation method, and its application.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] An MTQ-type branched intermediate, the structural composition of which is represented by the following formula I:

[0011] (R a R b R c SiO 1 / 2 ) m (R d SiO 3 / 2 ) t (SiO 4 / 2 ) q Formula I

[0012] In formula I, R a R b R c R d Each is independently selected from -H, -CH2=CH2, -CH3, -C6H5, -OCH3, and -OCH2CH3;

[0013] m, t, and q represent the degree of aggregation of each structural unit, where m ranges from 1 to 48, t ranges from 1 to 10, and q ranges from 1 to 8.

[0014] Preferably, m ranges from 10 to 30, t ranges from 1 to 10, and q ranges from 2 to 6.

[0015] A method for preparing the MTQ-type branched intermediate as described above is to obtain it by hydrolysis and condensation reaction of reactants containing M units, T units and Q units;

[0016]

[0017] The amount of reactants containing M units, T units and Q units, in the molar ratio of each unit, is (1-48):(1-10):(1-8), preferably (10-30):(1-10):(2-6).

[0018] In some preferred examples, the reactant containing the M unit is selected from one or more of hexamethyldisiloxane, tetramethyldisiloxane, 1,1,3,3-tetramethyl-1,3-diphenyldisiloxane, and divinyltetramethyldisiloxane;

[0019] Preferably, the reactant containing the T unit is selected from one or more of vinyltrimethoxysilane, vinyltriethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, phenyltrimethoxysilane, and phenyltriethoxysilane;

[0020] Preferably, the reactant containing the Q unit is selected from one or more of orthosilicic acid, methyl orthosilicate, and ethyl orthosilicate.

[0021] In some preferred examples, the preparation method includes the following reaction process:

[0022] 1) In the presence of catalyst A, reactants containing M units, T units, and Q units are mixed and allowed to equilibrate for a period of time;

[0023] 2) Add water to the reaction system to carry out hydrolysis and condensation reaction; after the reaction is completed, remove small molecules, optionally add a neutralizing agent, and after treatment, obtain MTQ type branched intermediate;

[0024] By mixing reactants containing M, T, and Q units and carrying out an equilibrium reaction, followed by hydrolysis and condensation, the study found that this method helps to avoid gel formation and also increases the degree of branching.

[0025] Preferably, the catalyst A is selected from one or more of sulfuric acid, trifluoromethanesulfonic acid, acidic ion exchange resin, and acidic clay; more preferably, the amount of catalyst A is 0.1-5% of the total mass of the reactants containing M units, T units, and Q units.

[0026] Preferably, the neutralizing agent is selected from one or more of sodium bicarbonate, sodium carbonate, calcium carbonate, potassium carbonate, sodium hydroxide, potassium hydroxide, or calcium hydroxide; more preferably, the amount of the neutralizing agent is 10-20 times the mass of catalyst A.

[0027] In some preferred examples, the reaction conditions in step 1) are: reaction at 3-80℃ for 1-1.5h;

[0028] Preferably, in step 2), the amount of water added, in molar terms, is 1-1.2 times the molar amount of the reactant containing unit M;

[0029] Preferably, the hydrolysis-condensation reaction conditions in step 2) are: reaction at 3-80℃ for 2-8 hours;

[0030] Preferably, the treatment conditions after adding the neutralizing agent in step 2) are: reaction at 3-80℃ for 0.5-3h.

[0031] Preferably, the neutralization process further includes a post-processing step;

[0032] Preferably, the post-processing method includes filtering.

[0033] Preferably, the post-processing method includes: filtration and vacuum distillation.

[0034] In this invention, unreacted small molecules are removed by filtration to remove salt and by vacuum distillation.

[0035] A branched organosilicon polysiloxane, the structural composition of which is represented by the following formula II:

[0036] (R a R b R c SiO 1 / 2 ) m (R e SiO 2 / 2 ) s (R d SiO 3 / 2 ) t (SiO 4 / 2 ) q II

[0037] In Equation II, R a R b R c R d Each is independently selected from -H, -CH2=CH2, -CH3, -C6H5, -OCH3, -OCH2CH3; R e Selected from -CH3, -CH2CH3;

[0038] m, t, and q represent the degree of aggregation of each structural unit, where m ranges from 1 to 48, t ranges from 1 to 10, q ranges from 1 to 8, and s ranges from 1000 to 7000.

[0039] Preferably, m ranges from 10 to 30, t ranges from 1 to 10, q ranges from 2 to 6, and s ranges from 4000 to 6500.

[0040] The branched organosilicon polysiloxane has a number average molecular weight of 300,000 to 600,000.

[0041] A method for preparing branched organosilicon polysiloxane as described above involves carrying out a ring-opening polymerization reaction of the MTQ-type branched intermediate described above or the MTQ-type branched intermediate obtained by the method described above and the organosilicon cyclic body in the presence of catalyst B, and optionally adding a neutralizing agent.

[0042] Preferably, the organosiloxane cyclic form is selected from one or more of hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecylcyclohexasiloxane, or tetradecylcycloheptasiloxane;

[0043] Preferably, the amount of the MTQ-type branched intermediate is 0.5-2% of its total mass and that of the organosiloxane cyclic compound;

[0044] Preferably, the catalyst B is selected from one or more of trifluoromethanesulfonic acid, sulfuric acid, acidic clay, acidic ion exchange resin, tetramethylammonium hydroxide, tetramethylammonium hydroxide alkaline gel, potassium hydroxide, and potassium hydroxide alkaline gel; more preferably, the amount of the catalyst B is 0.05-4% of the total mass of the MTQ-type branched intermediate and the organosiloxane cyclic compound.

[0045] Preferably, the neutralizing agent is selected from one or more of sodium bicarbonate, sodium carbonate, calcium carbonate, potassium carbonate, sodium hydroxide, potassium hydroxide, or calcium hydroxide; more preferably, the amount of the neutralizing agent is 10-20 times the mass of catalyst B.

[0046] In some preferred examples, the reaction temperature is 50-180°C and the reaction time is 3-5 hours.

[0047] In some preferred examples, the ring-opening polymerization reaction is further followed by a post-processing step.

[0048] Preferably, the post-processing method includes: removing small molecules from the reaction system.

[0049] The application of a branched organosilicon polysiloxane as described above, or a branched organosilicon polysiloxane prepared by the method described above, as an antifogging agent in release agents.

[0050] The MTQ-type branched organosilicon polysiloxane provided by this invention has the characteristics of high molecular weight and low viscosity. At the same time, the internal structure of the composition has a high degree of branching. Compared with linear raw rubber of the same molecular weight, it has little impact on the viscosity of the release agent when the same amount is added. In addition, the high degree of branching in the internal structure can be dispersed in the release agent to improve its cohesion, thereby reducing its atomization degree and solving the atomization problem in the high-speed roller coating process. Detailed Implementation

[0051] The present invention will be further illustrated below with specific embodiments. These embodiments are merely illustrative and do not limit the scope of the invention.

[0052] Unless otherwise specified, the raw materials and reagents involved in the following embodiments of the present invention can be purchased from commercially available finished products.

[0053] The performance testing method involved in this invention is as follows:

[0054] (1) Atomization value test: A high-speed disperser (BGD740, BGD Precision Instruments Co., Ltd.) was used. A 500ml metal measuring cup was used to take 200g of sample for high-speed dispersion at a speed of 7000rad / min. The data was recorded for 2 minutes using an atomizer (Dustrak 8532) at a height of 2cm from the measuring cup.

[0055] (2) Release force test method:

[0056] 1. Take a 25.4mm wide and 200mm long TESA 7475 tape and apply it to the test surface (release surface), and roll it back and forth 3 times with a 2KG standard rolling roller.

[0057] 2. After applying the tape, let it stand for 20 minutes. The temperature and humidity in the laboratory should be controlled at 23±2℃ and 50±5%, respectively.

[0058] 3. Use the non-test surface of the sample and fix it on a standard steel plate for testing;

[0059] 4. Install the material onto the fixture and test the tape by stretching it at a 180-degree angle using a tensile testing machine. The data displayed on the computer of the tensile testing machine is the release force of the test piece (g / inch). Take the average of 5 values ​​as the test result.

[0060] (3) Residual adhesion rate test method:

[0061] Apply a standard adhesive tape (such as NITTO 31B, 25mm width) to the release surface and roll it back and forth three times with a 2kg standard pressure roller. Then, age it for 20 hours at 70°C and under the pressure of a 2kg standard weight. After aging, cool it at room temperature for 0.5 hours, and then peel it 180° at a speed of 300mm / min. Each sample should contain no fewer than three tapes.

[0062] The standard tape peeled off in step 1 is then applied to a blank substrate and placed under 2000g pressure at room temperature for 2 hours. Then, it is peeled off at a speed of 300mm / min at 180°. The value L1 is recorded and the average value is taken.

[0063] Apply standard tape to a blank substrate, roll it back and forth 3 times with a 2 kg standard pressure roller, then place it at 2000 g pressure and room temperature for 2 hours, and then peel it 180° at a speed of 300 mm / min. Record the value L0 and take the average value.

[0064] The residual adhesion rate is calculated as L1 ÷ L0 × 100%.

[0065]

Example 1

[0066] A method for preparing an MTQ-type branched intermediate is as follows:

[0067] (1) Under the action of trifluoromethanesulfonic acid (0.55g), divinyltetramethyldisiloxane (186.40g, 1mol), vinyltrimethoxysilane (148.23g, 1mol), and ethyl silicate (208.33g, 1mol) were reacted at 60℃ for 1h in equilibrium.

[0068] (2) Add water (4 mol) to the above reaction system and carry out hydrolysis condensation reaction at 80°C for 3 h. Then remove small molecules, add calcium carbonate (5.5 g) to it, carry out neutralization reaction at 80°C for 3 h, and filter to obtain MTQ type branched intermediate A.

[0069] The molecular weight of the obtained MTQ-type branched intermediate A is 549, and its structural expression is as follows:

[0070] (R a R b R c SiO 1 / 2 ) m (R d SiO 3 / 2 ) t (SiO 4 / 2 ) q

[0071] Among them, R a For -CH=CH2, R b For -OCH3, R c For -OH, R d The expression is -CH=CH2. m, t, and q represent the degree of polymerization of each structural unit, where m=2, t=1, and q=1.

[0072]

Example 2

[0073] A method for preparing an MTQ-type branched intermediate is as follows:

[0074] (1) In the presence of trifluoromethanesulfonic acid (0.50 g), tetramethyldisiloxane (335.8 g, 2.5 mol), vinyltrimethoxysilane (296.46 g, 2 mol), and methyl silicate (106.2 g, 1 mol) reacted at 15 °C for 1.5 h in equilibrium.

[0075] (2) Add water (3 mol) to the above reaction system and carry out hydrolysis condensation reaction at 60°C for 5 h. Then remove small molecules, add sodium carbonate (6 g) to it, carry out neutralization reaction at 40°C for 2 h, and filter to obtain MTQ type branched intermediate B.

[0076] The molecular weight of the obtained MTQ-type branched intermediate A is 474, and its structural expression is as follows:

[0077] (R a R b R c SiO 1 / 2 ) m (R d SiO 3 / 2 ) t (SiO 4 / 2 ) q

[0078] In the formula, R a -H, R b For -CH=CH2, R c For -OCH3, R d The expression is -CH=CH2. m, t, and q represent the degree of polymerization of each structural unit, where m=5, t=2, and q=1.

[0079]

Example 3

[0080] A method for preparing an MTQ-type branched intermediate is as follows:

[0081] (1) Under the action of trifluoromethanesulfonic acid (0.60 g), hexamethyldisiloxane (324 g, 2 mol), methyltrimethoxysilane (136.2 g, 1 mol) and methyl silicate (312.2 g, 2 mol) reacted at 15 °C for 1.5 h in equilibrium.

[0082] (2) Add water (3 mol) to the above reaction system and carry out hydrolysis condensation reaction at 60℃ for 5 h. Then remove small molecules, add sodium carbonate (6 g) to it, carry out neutralization reaction at 40℃ for 2 h, and filter to obtain MTQ type branched intermediate C.

[0083] The molecular weight of the obtained MTQ-type branched intermediate A is 544, and its structural expression is as follows:

[0084] (R a R b R c SiO 1 / 2 ) m (R d SiO 3 / 2 ) t (SiO 4 / 2 ) q

[0085] In the formula, R a For -CH3, R b For -OCH3, R c For -OH, R dThe value is -CH3. m, t, and q represent the degree of polymerization of each structural unit, where m = 4, t = 1, and q = 2.

[0086]

Example 4

[0087] A method for preparing an MTQ-type branched intermediate is as follows:

[0088] (1) Under the action of trifluoromethanesulfonic acid (0.60 g), hexamethyldisiloxane (324 g, 2 mol), vinyltrimethoxysilane (296.46 g, 2 mol), and methyl silicate (53.1 g, 0.5 mol) reacted at 15 °C for 1.5 h in equilibrium.

[0089] (2) Add water (4 mol) to the above reaction system and carry out hydrolysis condensation reaction at 60℃ for 5 h. Then remove small molecules, add sodium carbonate (6 g) to it, carry out neutralization reaction at 40℃ for 2 h, and filter to obtain MTQ type branched intermediate D.

[0090] The molecular weight of the obtained MTQ-type branched intermediate A is 976, and its structural expression is as follows:

[0091] (R a R b R c SiO 1 / 2 ) m (R d SiO 3 / 2 ) t (SiO 4 / 2 ) q

[0092] In the formula, R a For -CH3, R b For -CH=CH2, R c For -OH, R d The value is -CH3. m, t, and q represent the degree of polymerization of each structural unit, where m = 8, t = 4, and q = 1.

[0093]

Example 5

[0094] A method for preparing branched organosilicon polysiloxane is as follows:

[0095] In the presence of tetramethylammonium hydroxide, 1 mol of MTQ-type branched intermediate A and 1000 mol of octamethylcyclotetrasiloxane underwent a ring-opening polymerization reaction at 105 °C for 4 h to remove small molecules from the reaction system, yielding branched organosilicon polysiloxane A. The amount of tetramethylammonium hydroxide used was 0.05% of the total mass of MTQ-type branched intermediate A and octamethylcyclotetrasiloxane.

[0096] The tested product had a viscosity of 80,000 cp, a vinyl content of 0.18%, a volatile content of 0.85%, and Mn = 74549.

[0097]

Example 6

[0098] A method for preparing branched organosilicon polysiloxane is as follows:

[0099] Under the action of tetramethylammonium hydroxide alkaline gel, MTQ-type branched intermediate B (1 mol) and decamethylcyclopentasiloxane (1800 mol) underwent a ring-opening polymerization reaction at 95 °C for 4 h, removing small molecules from the reaction system to obtain branched organosilicon polysiloxane B. The amount of tetramethylammonium hydroxide alkaline gel used was 0.10% of the total mass of MTQ-type branched intermediate B and decamethylcyclopentasiloxane.

[0100] The tested product had a viscosity of 160,000 cp, a vinyl content of 0.02%, a volatile content of 1.05%, and Mn = 141474.

[0101]

Example 7

[0102] A method for preparing branched organosilicon polysiloxane is as follows:

[0103] In the presence of potassium hydroxide, 1 mol of MTQ-type branched intermediate C and 4000 mol of decamethylcyclopentasiloxane underwent ring-opening polymerization at 150 °C for 4 h. Phosphoric acid was then added as a neutralizing agent to remove small molecules from the reaction system, yielding branched organosilicon polysiloxane C. The amount of potassium hydroxide used was 0.15% of the total mass of MTQ-type branched intermediate C and decamethylcyclopentasiloxane, and the amount of phosphoric acid was 10 times the mass of potassium hydroxide.

[0104] The tested product had a viscosity of 740,000 cp, a volatile content of 0.9%, and Mn = 296,544.

[0105]

Example 8

[0106] A method for preparing branched organosilicon polysiloxane is as follows:

[0107] Under the action of tetramethylammonium hydroxide alkaline gel, MTQ-type branched intermediate C (1 mol) and dodecylcyclohexasiloxane (5000 mol) underwent a ring-opening polymerization reaction at 115 °C for 4 h to remove small molecules from the reaction system, yielding branched organosilicon polysiloxane C. The amount of tetramethylammonium hydroxide used was 0.08% of the total mass of MTQ-type branched intermediate C and dodecylcyclohexasiloxane.

[0108] The tested product had a viscosity of 1,200,000 cp, a volatile content of 0.85%, and Mn = 380,976.

[0109] Comparative Example 1

[0110] The following raw materials are designated as organosilicon polysiloxane E:

[0111] Manufacturer: Zhejiang Runhe; Brand: RH-Vi 301; Vinyl silicone oil with a viscosity of 200,000, volatile matter: 0.85%, Mn = 142650.

[0112] Comparative Example 2

[0113] The following raw material is designated as organosilicon polysiloxane F:

[0114] Manufacturer: Nanjing Dongjue; Brand: Dongjue 110 Raw Rubber-0; Vinyl raw rubber with a viscosity of 1.2 million, volatile matter: 0.95%, Mn = 339611.

[0115]

Application Example 1

[0116] The branched organosilicon polysiloxanes prepared in each embodiment and comparative example were mixed with 200 cp silicone oil, with the amount of branched organosilicon polysiloxane added being 1% of the mass of silicone oil. Coating experiments were conducted using a three-roll coater to test its viscosity, atomization value, release force, and grafting participation rate. The results are shown in Table 1.

[0117] Table 1

[0118]

[0119]

Application Example 2

[0120] The branched organosilicon polysiloxanes prepared in each embodiment and comparative example were mixed with 200 cp silicone oil, with the amount of branched organosilicon polysiloxane added being 2% of the mass of silicone oil. Coating experiments were conducted using a three-roll coater to test its viscosity, atomization value, release force, and grafting participation rate. The results are shown in Table 2.

[0121] Table 2

[0122]

[0123] Tables 1 and 2 show the test results of branched organosilicon polysiloxane in release agents at addition amounts of 1% and 2%, respectively. The results indicate that the organosilicon polysiloxane provided by this invention has a relatively small impact on the viscosity of the release agent main component under the same molecular weight conditions, while also effectively reducing the fogging value. Furthermore, it can be seen that with the increase in the amount of organosilicon polysiloxane added, its anti-fogging effect is more significant, and the viscosity increase is lower, while the product release force and residual adhesion remain stable.

[0124] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and additions without departing from the method of the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention.

Claims

1. An MTQ-type branched intermediate, characterized in that, Its structural composition is represented by the following formula I: (R a R b R c SiO 1 / 2 ) m (R d SiO 3 / 2 ) t (SiO 4 / 2 ) q formula I In formula I, R a R b R c R d Each is independently selected from -H, -CH2=CH2, -CH3, -C6H5, -OCH3, and -OCH2CH3; m, t, and q represent the degree of aggregation of each structural unit, where m ranges from 1 to 48, t ranges from 1 to 10, and q ranges from 1 to 8. Preferably, m ranges from 10 to 30, t ranges from 1 to 10, and q ranges from 2 to 6.

2. A method for preparing the MTQ-type branched intermediate as described in claim 1, characterized in that, It is obtained by hydrolysis and condensation reaction of reactants containing M units, T units and Q units; The amount of reactants containing M units, T units and Q units, in the molar ratio of each unit, is (1-48):(1-10):(1-8), preferably (10-30):(1-10):(2-6).

3. The method for preparing the MTQ-type branched intermediate according to claim 2, characterized in that, The reactants containing the M unit are selected from one or more of hexamethyldisiloxane, tetramethyldisiloxane, 1,1,3,3-tetramethyl-1,3-diphenyldisiloxane, and divinyltetramethyldisiloxane; Preferably, the reactant containing the T unit is selected from one or more of vinyltrimethoxysilane, vinyltriethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, phenyltrimethoxysilane, and phenyltriethoxysilane; Preferably, the reactant containing the Q unit is selected from one or more of orthosilicic acid, methyl orthosilicate, and ethyl orthosilicate.

4. The method for preparing the MTQ-type branched intermediate according to claim 2 or 3, characterized in that, The reaction process includes the following: 1) In the presence of catalyst A, reactants containing M units, T units, and Q units are mixed and allowed to equilibrate for a period of time; 2) Add water to the reaction system to carry out hydrolysis and condensation reaction; after the reaction is completed, remove small molecules, optionally add a neutralizing agent, and after treatment, obtain MTQ type branched intermediate; Preferably, the catalyst A is selected from one or more of sulfuric acid, trifluoromethanesulfonic acid, acidic ion exchange resin, and acidic clay; more preferably, the amount of catalyst A is 0.1-5% of the total mass of the reactants containing M units, T units, and Q units. Preferably, the neutralizing agent is selected from one or more of sodium bicarbonate, sodium carbonate, calcium carbonate, potassium carbonate, sodium hydroxide, potassium hydroxide, or calcium hydroxide; more preferably, the amount of the neutralizing agent is 10-20 times the mass of catalyst A.

5. The method for preparing the MTQ-type branched intermediate according to claim 4, characterized in that, The reaction conditions in step 1) are: reaction at 3-80℃ for 1-1.5 hours; Preferably, the hydrolysis-condensation reaction conditions in step 2) are: reaction at 3-80℃ for 2-8 hours; Preferably, the treatment conditions after adding the neutralizing agent in step 2) are: reaction at 3-80℃ for 0.5-3h.

6. A branched organosilicon polysiloxane, characterized in that, The structural composition is represented by the following formula II: (R a R b R c SiO 1 / 2 ) m (R e SiO 2 / 2 ) s (R d SiO 3 / 2 ) t (SiO 4 / 2 ) q II In Equation II, R a R b R c R d Each is independently selected from -H, -CH2=CH2, -CH3, -C6H5, -OCH3, -OCH2CH3; R e Selected from -CH3, -CH2CH3; m, t, and q represent the degree of aggregation of each structural unit, where m ranges from 1 to 48, t ranges from 1 to 10, q ranges from 1 to 8, and s ranges from 1000 to 7000. Preferably, m ranges from 10 to 30, t ranges from 1 to 10, q ranges from 2 to 6, and s ranges from 4000 to 6500.

7. A method for preparing branched organosilicon polysiloxane as described in claim 6, characterized in that, It is prepared by reacting the MTQ type branched intermediate obtained by the method described in claim 1 or any one of claims 1-5 and the organosiloxane cyclic body in the presence of catalyst B, and optionally by adding a neutralizing agent. Preferably, the organosiloxane cyclic compound is selected from one or more of hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecylcyclohexasiloxane, and tetradecylcycloheptasiloxane; Preferably, the amount of the MTQ-type branched intermediate is 0.5-2% of its total mass and that of the organosiloxane cyclic compound; Preferably, the catalyst B is selected from one or more of trifluoromethanesulfonic acid, sulfuric acid, acidic clay, acidic ion exchange resin, tetramethylammonium hydroxide, tetramethylammonium hydroxide alkaline gel, potassium hydroxide, and potassium hydroxide alkaline gel; more preferably, the amount of the catalyst B is 0.05-4% of the total mass of the MTQ-type branched intermediate and the organosiloxane cyclic compound. Preferably, the neutralizing agent is selected from one or more of sodium bicarbonate, sodium carbonate, calcium carbonate, potassium carbonate, sodium hydroxide, potassium hydroxide, or calcium hydroxide; more preferably, the amount of the neutralizing agent is 10-20 times the mass of catalyst B.

8. The method for preparing branched organosilicon polysiloxane according to claim 7, characterized in that, The reaction temperature is 50-180℃, and the reaction time is 3-5h.

9. The application of a branched organosilicon polysiloxane as described in claim 6 or a branched organosilicon polysiloxane prepared by the method of claim 7 or 8 as an antifogging agent in a release agent.

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