MDT type phenyl hydrogen-containing silicon resin and preparation method thereof

Abstract

The invention belongs to the field of resin processing and manufacturing, and particularly relates to MDT type phenyl hydrogen-containing silicon resin and a preparation method thereof. The preparation process of the MDT type phenyl hydrogen-containing silicon resin comprises the following steps: simultaneously hydrolyzing various phenyl alkoxy silanes under acidic and low-temperature conditions, further performing high-temperature condensation under a heating condition, performing liquid separation through a separating funnel to obtain an organic phase and a water phase, neutralizing the organic phase by water washing, and removing water to obtain transparent liquid, thereby obtaining the MDT type phenyl hydrogen-containing silicon resin. And finally, carrying out reduced pressure desorption on the transparent liquid to obtain the MDT type phenyl hydrogen-containing silicon resin with excellent performance. The MDT type phenyl hydrogen-containing silicon resin provided by the invention is mild in synthesis condition, simple in operation process, less in wastewater generated during neutralization treatment, recyclable in solvent and relatively high in large-scale production operability.

Description

Technical Field

[0001] This invention belongs to the field of resin processing and manufacturing, and specifically relates to an MDT type phenyl hydrogen-containing silicone resin and its preparation method. Background Technology

[0002] Phenyl-containing hydrogen silicone resins are a class of organosilicon polymers possessing both phenyl groups and active silane-hydrogen bonds (Si-H). Due to the introduction of phenyl groups into their molecular structure, these resins exhibit excellent high-temperature resistance, radiation resistance, light transmittance, and electrical insulation properties. Simultaneously, the silane-hydrogen bonds provide high reactivity, allowing them to crosslink and cure with alkenyl, epoxy, and other functional groups through addition reactions. They are widely used in high-temperature coatings, electronic encapsulation adhesives, LED optical encapsulation materials, ceramic precursors, and specialty adhesives.

[0003] Hydrosilylation reactions can appropriately improve product performance and achieve a reinforcing effect. Hydrosilylation refers to the reaction of Si-H and Si-CH=CH2 under a catalyst, where polymers containing Si-H and Si-CH=CH2 act as the main reactants, while Si-H polymers are primarily used as crosslinking agents. MDT silicone resins are a type of silicone resin composed of M-units and T and D units. By adjusting the phenyl / methyl ratio, Si-H content, and molecular weight, resin properties such as flexibility, temperature resistance, and reaction rate can be controlled.

[0004] Currently disclosed technologies typically utilize the co-hydrolysis condensation reaction of silanes. Patent CN104277222A uses phenylalkoxysilane, water glass, and small molecule materials to prepare phenyl hydrogen-containing silicone resin through co-hydrolysis condensation at room temperature. However, this method suffers from sodium ion residue, affecting weather resistance and limiting its application to building fireproof materials and low-cost fillers. Patent CN117720730A treats a mixture of phenylalkoxysilane and orthosilicate compounds, methylsiloxane, and a hydrogen-containing end-capping agent separately under an acidic catalyst to obtain hydrolysis products and a pretreated end-capping agent. These are then stirred and heated to react, followed by water washing and dehydrogenation to obtain phenyl hydrogen-containing silicone resin. However, this method suffers from severe Si-H bond hydrolysis, resulting in low retention rates and high brittleness of the silicone resin. Patent CN111057241A uses phenylalkoxysilane and an acidic catalyst to obtain a hydroxyl-containing phenyl polysiloxane intermediate. The intermediate, end-capping agent, and acidic cationic resin are then mixed and reacted. Subsequent removal of the acidic cationic resin and vacuum distillation to remove low-boiling components yields MT hydrogen-containing methylphenyl silicone resin. However, this method suffers from problems such as excessive wastewater generation during water washing and neutralization, difficulty in cleaning the acidic cationic resin, and high costs, making it unsuitable for large-scale production. Existing technologies also suffer from drawbacks such as consuming large amounts of organic solvents, poor reproducibility and controllability, complex synthesis processes, and high pollution and energy consumption. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides an MDT-type phenyl-hydrosilicone resin with excellent refractive index, low viscosity, low volatile content, good temperature resistance, and good weather resistance, as well as its preparation method. The preparation process involves simultaneously hydrolyzing multiple phenylalkoxysilanes under acidic and low-temperature conditions, followed by further high-temperature condensation under heating conditions. The mixture is then separated using a separatory funnel to obtain an organic phase and an aqueous phase. The organic phase is washed, neutralized, and dehydrated to obtain a transparent liquid. Finally, the transparent liquid is depressurized to remove excess water, resulting in a high-performance MDT-type phenyl-hydrosilicone resin.

[0006] In order to achieve the above objectives, The first aspect of this invention discloses a method for preparing an MDT-type phenyl hydrogen-containing silicone resin, comprising the following steps: S1: Add the acidic catalyst aqueous solution, mixed solvent, and hydrogen-containing capping agent to the reaction vessel, heat to temperature T1 with stirring, slowly add the mixture of T-type phenylsiloxane and D-type phenylsiloxane at temperature T1, and after the addition is completed, perform low-temperature co-hydrolysis reaction for time t1, continue stirring and raise the temperature to T2, perform condensation reaction at temperature T2 for time t2, and after the reaction is completed, let it stand and take the lower turbid liquid organic phase. S2: After washing the organic phase in S1 with water until neutral, remove it, add a desiccant and let it stand until transparent. Filter to remove the desiccant powder to obtain a transparent liquid. Transfer the transparent liquid to a reaction vessel and depressurize it at temperature T3 to obtain MDT type phenyl hydrogen-containing silicone resin.

[0007] This invention employs a co-hydrolysis strategy under acidic and low-temperature conditions, which effectively suppresses the occurrence of side reactions caused by the easy hydrolysis of Si-H bonds under alkaline or high-temperature conditions, thus solving the core problem of low Si-H retention rate in the prior art.

[0008] The acidic catalyst is at least one of hydrochloric acid, sulfuric acid, p-toluenesulfonic acid, trifluoroacetic acid, formic acid, acetic acid, phosphoric acid, and trifluoromethanesulfonic acid; the concentration of the aqueous solution of the acidic catalyst is 2%-15%.

[0009] The mixed solvent is at least two of isopropanol, acetone, ethanol, xylene, toluene, cyclohexane, n-hexane, and petroleum ether.

[0010] The hydrogen-containing end-capping agent is at least one of 1,1,3,3-tetramethyldisiloxane, pentamethyltrihydrotrisiloxane, and pentamethylphenyldihydrotrisiloxane.

[0011] Wherein, the T-type phenylsiloxane is at least one of phenyltrimethoxysilane, phenyltriethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, vinyltrimethoxysilane, phenylmethoxydiethoxysilane, and p-methylphenyltrimethoxysilane; The D-type phenylsiloxane is at least one of phenylmethyldimethoxysilane, phenylmethyldiethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane, and phenylvinyldimethoxysilane.

[0012] The water-absorbing agent is at least one of anhydrous magnesium sulfate, anhydrous calcium chloride, calcium oxide, phosphorus pentoxide, magnesium sulfate heptahydrate, and molecular sieve.

[0013] Preferably, the amount of the acidic catalyst aqueous solution used is 30%-50 wt% of the total mass of T-type phenylsiloxane, D-type phenylsiloxane, and hydrogen-containing end-capping agent; The amount of the mixed solvent is 70%-90 wt% of the total mass of T-type phenylsiloxane, D-type phenylsiloxane, and hydrogen-containing capping agent, and the mass ratio of polar solvent to non-polar solvent in the mixed solvent is 1-5:1-5.

[0014] The molar mass ratio of the T-type phenylsiloxane, D-type phenylsiloxane, and hydrogen-containing end-capping agent is 100-120:30-50:20-40.

[0015] In S1, the temperature T1 is 30℃-70℃, and the time t1 is 1h-3h; the temperature T2 is 60℃-90℃, and the time t2 is 2h-8h. In S2, the temperature T3 for decompression is 130℃-190℃.

[0016] The second aspect of the present invention discloses an MDT-type phenyl hydrogen-containing silicone resin, characterized in that it is prepared by the preparation method described in any one of claims 1-8.

[0017] The third aspect of this invention discloses the application of the above-mentioned MDT-type phenyl hydrogen-containing silicone resin in the fields of high-temperature resistant coatings, electronic encapsulation adhesives, LED optical encapsulation materials, ceramic precursors, and special adhesives.

[0018] The T-type and D-type phenylsiloxanes provided by this invention undergo accelerated hydrolysis under acidic conditions to generate silanols. The generated silanols (-Si-OH) undergo accelerated dehydration / de-alcoholization condensation reactions with each other (-Si-OH), or with unhydrolyzed alkoxy groups, forming stable siloxane bonds (Si-O-Si) and releasing water or alcohol. The T-unit has three hydrolyzable methoxy groups, enabling crosslinking to form a three-dimensional network structure, providing the resin with crosslinking degree and rigidity. The D-unit introduces phenyl groups and side-chain methyl groups into the linear chain, acting as a "chain extender" and "modifier," providing the resin with flexibility, elasticity, and plasticity, and reducing crosslinking density. The resin obtained from a mixture of T-type and D-type units can simultaneously satisfy requirements for hardness, flexibility, and heat resistance. Polar solvents are miscible with water and can promote hydrolysis, while non-polar solvents can dissolve resin precursors and control condensation. Mixed solvents fully utilize the advantages of each solvent and make up for the shortcomings of a single solvent. They synergistically control the hydrolysis and condensation rates, thereby obtaining resins with regular molecular structures and excellent performance, while ensuring operational safety.

[0019] Compared with the prior art, the present invention has the following advantages: The MDT-type phenyl hydrogen-containing silicone resin provided by this invention has mild synthesis conditions, with the entire reaction process occurring at temperatures between 50℃ and 90℃. The operation is simple, generates little wastewater during neutralization, the solvent is recyclable, and it is highly feasible for large-scale production. The MDT-type phenyl hydrogen-containing silicone resin is a colorless, transparent liquid with a refractive index of 1.51~1.53 and a volatile content of 0%-1%. At 25℃, the viscosity of the MDT-type phenyl hydrogen-containing silicone resin is 200 mPa·s to 5000 mPa·s. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or existing methods and experiments, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a product image of the MDT-type phenyl hydrogen-containing silicone resin prepared in Example 1 of the present invention; Figure 2 This is a product image of the MDT-type phenyl hydrogen-containing silicone resin prepared in Example 2 of the present invention; Figure 3 This is a product image of the MDT-type phenyl hydrogen-containing silicone resin prepared in Example 3 of the present invention; Figure 4 This is a product image of the MDT-type phenyl hydrogen-containing silicone resin prepared in Example 4 of the present invention; Figure 5This is a product image of the MDT-type phenyl hydrogen-containing silicone resin prepared in Example 5 of the present invention; Figure 6 This is a product image of the MDT-type phenyl hydrogen-containing silicone resin prepared in Example 6 of the present invention. Detailed Implementation

[0022] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments, but this does not limit the present invention to the scope of the described embodiments. Experimental methods and techniques in the following embodiments that do not specify specific conditions are generally performed according to conventional conditions in the relevant art or according to the conditions recommended by the manufacturer.

[0023] To make the technical problems, technical solutions, and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0024] Example 1 An MDT-type phenyl hydrogen-containing silicone resin and its preparation method, comprising the following steps: Step 1: Add 45g of 10% sulfuric acid solution, 23g of ethanol, 57g of xylene, and 9g of 1,1,3,3-tetramethyldisiloxane to a four-necked flask. Heat to 50°C with stirring. At this temperature, slowly add a mixture of 66g of phenyltrimethoxysilane and 30g of phenylmethyldimethoxysilane dropwise over 20 minutes. After the addition is complete, co-hydrolyze at 55°C for 1 hour. Continue heating to 75°C with stirring, and perform the condensation reaction at this temperature for 2 hours. After the reaction is complete, transfer to a separatory funnel and allow to stand. Collect the lower turbid organic phase.

[0025] Step 2: Wash the organic phase once with water until neutral. Remove the turbid organic phase after washing, add 5g of anhydrous calcium chloride, and let stand until clear. Filter to remove the desiccant powder, obtaining a clear liquid. Transfer the clear liquid to a four-necked flask and desorb under reduced pressure at 150℃ for 2 hours, then raise the temperature to 190℃ and continue desorption for 0.5 hours to obtain MDT-type phenyl hydrogen-containing silicone resin.

[0026] The phenyl hydrogen-containing silicone resin obtained by this method is transparent in appearance, with a hydrogen content of 0.29 wt%, a volatile content of 0.8%, a refractive index of 1.5338 and a viscosity of 3162 mPa·s at 25℃.

[0027] Example 2 An MDT-type phenyl hydrogen-containing silicone resin and its preparation method, comprising the following steps: Step 1: Add 40g of 7% hydrochloric acid solution, 23g of ethanol, 57g of xylene (the low-boiling xylene produced in the above experiment), and 9g of 1,1,3,3-tetramethyldisiloxane to a four-necked flask. Heat to 50°C with stirring. At this temperature, slowly add a mixture of 66g of phenyltriethoxysilane and 30g of phenylmethyldisiloxane dropwise over 20 minutes. After the addition is complete, co-hydrolyze at 55°C for 1 hour. Continue heating to 70°C with stirring, and perform the condensation reaction at this temperature for 2 hours. After the reaction is complete, transfer to a separatory funnel and allow to stand. Collect the lower turbid organic phase.

[0028] Step 2: Wash the organic phase once with water until neutral. Remove the turbid organic phase after washing and add 10g of magnesium sulfate heptahydrate. Let it stand until clear. Filter to remove the desiccant powder, obtaining a clear liquid. Transfer the clear liquid to a four-necked flask and desorb under reduced pressure at 150℃ for 2 hours, then raise the temperature to 190℃ and continue desorption for 0.5 hours to obtain MDT-type phenyl hydrogen-containing silicone resin.

[0029] The phenyl hydrogen-containing silicone resin obtained by this method is semi-transparent in appearance, with a hydrogen content of 0.35 wt%, a volatile content of 0.5%, a refractive index of 1.5368 at 25℃, and a viscosity of 4390 mPa·s.

[0030] Example 3 An MDT-type phenyl hydrogen-containing silicone resin and its preparation method, comprising the following steps: Step 1: Add 50g of 10% sulfuric acid solution, 30g of ethanol, 50g of xylene, and 14g of 1,1,3,3-tetramethyldisiloxane to a four-necked flask. Heat to 50°C with stirring. At this temperature, slowly add a mixture of 80g of phenyltrimethoxysilane and 30g of phenylmethyldimethoxysilane dropwise over 30 minutes. After the addition is complete, co-hydrolyze at 55°C for 1 hour. Continue heating to 71°C with stirring, and perform the condensation reaction at this temperature for 2 hours. After the reaction is complete, transfer to a separatory funnel and allow to stand. Collect the lower turbid organic phase.

[0031] Step 2: Wash the organic phase once with water until neutral. Remove the turbid organic phase after washing, add 5g of anhydrous calcium chloride, and let stand until clear. Filter to remove the desiccant powder, obtaining a clear liquid. Transfer the clear liquid to a four-necked flask and desorb under reduced pressure at 150℃ for 2 hours, then raise the temperature to 190℃ and continue desorption for 0.5 hours to obtain MDT-type phenyl hydrogen-containing silicone resin.

[0032] The phenyl hydrogen-containing silicone resin obtained by this method is transparent in appearance, with a hydrogen content of 0.32 wt%, a volatile content of 0.9%, a refractive index of 1.5292 and a viscosity of 1048 mPa·s at 25℃.

[0033] Example 4 An MDT-type phenyl hydrogen-containing silicone resin and its preparation method, comprising the following steps: Step 1: Add 30g of 2% trifluoromethanesulfonic acid solution, 35g of isopropanol, 45g of toluene, and 5g of phenyldihydrotrisiloxane to a four-necked flask. Heat to 60°C with stirring. At this temperature, slowly add a mixture of 73g of methyltrimethoxysilane and 24g of diphenyldimethoxysilane dropwise over 30 minutes. After the addition is complete, co-hydrolyze at 60°C for 2 hours. Continue heating to 75°C with stirring, and perform the condensation reaction at this temperature for 4 hours. After the reaction is complete, transfer to a separatory funnel and allow to stand. Collect the lower turbid organic phase.

[0034] Step 2: Wash the organic phase once with water until neutral. Remove the turbid organic phase after washing, add 4g of calcium oxide, and let it stand until clear. Filter to remove the desiccant powder, obtaining a clear liquid. Transfer the clear liquid to a four-necked flask and desorb under reduced pressure at 150℃ for 2 hours, then raise the temperature to 190℃ and continue desorption for 0.5 hours to obtain MDT-type phenyl hydrogen-containing silicone resin.

[0035] The phenyl hydrogen-containing silicone resin obtained by this method is transparent in appearance, with a hydrogen content of 0.25 wt%, a volatile content of 0.7%, a refractive index of 1.5125 at 25℃, and a viscosity of 780 mPa·s.

[0036] Example 5 An MDT-type phenyl hydrogen-containing silicone resin and its preparation method, comprising the following steps: Step 1: Add 35g of 5% p-toluenesulfonic acid solution, 40g of acetone, 45g of cyclohexane, and 5g of pentamethylphenyldihydrotrisiloxane to a four-necked flask. Heat to 60°C with stirring. At this temperature, slowly add a mixture of 56g of phenylmethoxydiethoxysilane and 19g of diphenyldiethoxysilane dropwise over 30 minutes. After the addition is complete, co-hydrolyze at 65°C for 2 hours. Continue heating to 80°C with stirring, and perform the condensation reaction at this temperature for 5 hours. After the reaction is complete, transfer to a separatory funnel and allow to stand. Collect the lower turbid organic phase.

[0037] Step 2: Wash the organic phase once with water until neutral. Remove the turbid organic phase after washing and add 8g of molecular sieve. Let it stand until transparent. Filter to remove the desiccant powder, obtaining a transparent liquid. Transfer the transparent liquid to a four-necked flask and degrade under reduced pressure at 150℃ for 2 hours, then raise the temperature to 190℃ and continue degrading for 0.5 hours to obtain MDT-type phenyl hydrogen-containing silicone resin.

[0038] The phenyl hydrogen-containing silicone resin obtained by this method is transparent in appearance, with a hydrogen content of 0.40 wt%, a volatile content of 0.7%, a refractive index of 1.5269 at 25℃, and a viscosity of 1320 mPa·s.

[0039] Example 6 An MDT-type phenyl hydrogen-containing silicone resin and its preparation method, comprising the following steps: Step 1: Add 50g of 8% sulfuric acid solution, 25g of isopropanol, 60g of xylene, and 15g of 1,1,3,3-tetramethyldisiloxane to a four-necked flask. Heat to 55°C with stirring. At this temperature, slowly add a mixture of 67g of phenyltrimethoxysilane and 33g of phenylmethyldimethoxysilane dropwise over 25 minutes. After the addition is complete, co-hydrolyze at 55°C for 2 hours. Continue heating to 71°C with stirring, and perform the condensation reaction at this temperature for 2.5 hours. After the reaction is complete, transfer to a separatory funnel and allow to stand. Collect the lower turbid organic phase.

[0040] Step 2: Add 5g of anhydrous magnesium sulfate directly to the organic phase and let it stand until transparent. Filter to remove the desiccant powder, obtaining a transparent liquid. Transfer the transparent liquid to a four-necked flask and depressurize under reduced pressure at 150℃ for 2 hours, then raise the temperature to 190℃ and continue depressing for 0.5 hours to obtain MDT-type phenyl hydrogen-containing silicone resin.

[0041] The phenyl hydrogen-containing silicone resin obtained by this method is transparent in appearance, with a hydrogen content of 0.28 wt%, a volatile content of 0.9%, a refractive index of 1.5245 at 25℃, and a viscosity of 450 mPa·s.

[0042] This invention uses a Runge nitrogen analyzer to test hydrogen content. The method involves the dehydrogenation reaction of Si-H in an aqueous solution of alkali metal hydroxide to produce H2. The gas volume is measured using a gas measuring tube, and the hydrogen content is calculated using the gas equation of state. Volatile matter is tested according to HG / T 4266-2011, after drying at 150℃ for 1 hour. Refractive index is measured using an Abbe refractometer, and viscosity is measured as rotational viscosity at 25℃. The products prepared in Examples 1-6 are shown below. Figure 1-6 .

[0043] The specific test data of hydrogen content, volatile matter, refractive index and viscosity of the phenyl hydrogen-containing silicone resins prepared in Examples 1-6 are shown in Table 1.

[0044] Table 1 Example Hydrogen content (wt%) volatile matter % Refractive index Viscosity (mPa.s) Example 1 0.29 0.8 1.5338 3162 Example 2 0.35 0.5 1.5368 4390 Example 3 0.32 0.9 1.5292 1048 Example 4 0.25 0.7 1.5125 780 Example 5 0.40 0.7 1.5269 1320 Example 6 0.28 0.9 1.5245 450 As can be seen from Table 1, the products of Examples 1-6 ( Figures 1-6 It is a colorless and transparent liquid with a pure appearance. Its refractive index is adjustable (1.51~1.53), allowing for good compatibility with materials such as LED chips and optical lenses, reducing light loss and making it ideal for high-end optical packaging applications.

[0045] Extremely low volatile content (0%~1%) indicates that the product has a concentrated molecular weight distribution and extremely low content of small molecules. During subsequent processing and use (such as high-temperature curing), it will not produce bubbles, pinholes or shrinkage due to volatilization, which significantly improves the reliability and lifespan of the final product.

[0046] With a wide viscosity range (200-5000 mPa·s), it can be adjusted by process parameters according to different application scenarios (such as spraying, dip coating, potting), making it highly adaptable.

[0047] The hydrogen content is stable and adjustable (0.25%~0.40% in the examples), which retains the highly reactive silane-hydrogen bonds, ensuring its high reactivity as a crosslinking agent or precursor. At the same time, the crosslinking density can be precisely controlled through formulation.

[0048] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall also fall within the protection scope of the present invention.

Claims

1. A method for preparing an MDT-type phenyl hydrogen-containing silicone resin, characterized in that, Includes the following steps: S1: Add the acidic catalyst aqueous solution, mixed solvent, and hydrogen-containing capping agent to the reaction vessel, heat to temperature T1 with stirring, slowly add the mixture of T-type phenylsiloxane and D-type phenylsiloxane at temperature T1, and after the addition is completed, perform low-temperature co-hydrolysis reaction for time t1, continue stirring and raise the temperature to T2, perform condensation reaction at temperature T2 for time t2, and after the reaction is completed, let it stand and take the lower turbid liquid organic phase. S2: After washing the organic phase in S1 with water until neutral, remove it, add a desiccant and let it stand until transparent. Filter to remove the desiccant powder to obtain a transparent liquid. Transfer the transparent liquid to a reaction vessel and depressurize it at temperature T3 to obtain MDT type phenyl hydrogen-containing silicone resin.

2. The method for preparing an MDT-type phenyl hydrogen-containing silicone resin according to claim 1, characterized in that, The acidic catalyst is at least one of hydrochloric acid, sulfuric acid, p-toluenesulfonic acid, trifluoroacetic acid, formic acid, acetic acid, phosphoric acid, and trifluoromethanesulfonic acid; the concentration of the aqueous solution of the acidic catalyst is 2%-15%.

3. The method for preparing an MDT-type phenyl hydrogen-containing silicone resin according to claim 1, characterized in that, The mixed solvent is at least two of isopropanol, acetone, ethanol, xylene, toluene, cyclohexane, n-hexane, and petroleum ether.

4. The method for preparing an MDT-type phenyl hydrogen-containing silicone resin according to claim 1, characterized in that, The hydrogen-containing end-capping agent is at least one of 1,1,3,3-tetramethyldisiloxane, pentamethyltrihydrotrisiloxane, and pentamethylphenyldihydrotrisiloxane.

5. The method for preparing an MDT-type phenyl hydrogen-containing silicone resin according to claim 1, characterized in that, The T-type phenylsiloxane is at least one of phenyltrimethoxysilane, phenyltriethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, vinyltrimethoxysilane, phenylmethoxydiethoxysilane, and p-methylphenyltrimethoxysilane; The D-type phenylsiloxane is at least one of phenylmethyldimethoxysilane, phenylmethyldiethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane, and phenylvinyldimethoxysilane.

6. The method for preparing an MDT-type phenyl hydrogen-containing silicone resin according to claim 1, characterized in that, The water-absorbing agent is at least one of anhydrous magnesium sulfate, anhydrous calcium chloride, calcium oxide, phosphorus pentoxide, magnesium sulfate heptahydrate, and molecular sieve.

7. The method for preparing an MDT-type phenyl hydrogen-containing silicone resin according to claim 1, characterized in that, The amount of the acidic catalyst aqueous solution used is 30%-50 wt% of the total mass of T-type phenylsiloxane, D-type phenylsiloxane, and hydrogen-containing end-capping agent; The amount of the mixed solvent is 70%-90 wt% of the total mass of T-type phenylsiloxane, D-type phenylsiloxane, and hydrogen-containing capping agent, and the mass ratio of polar solvent to non-polar solvent in the mixed solvent is 1-5:1-5. The molar mass ratio of the T-type phenylsiloxane, D-type phenylsiloxane, and hydrogen-containing end-capping agent is 100-120:30-50:20-40.

8. The method for preparing an MDT-type phenyl hydrogen-containing silicone resin according to claim 1, characterized in that, In S1, the temperature T1 is 30℃-70℃, and the time t1 is 1h-3h; the temperature T2 is 60℃-90℃, and the time t2 is 2h-8h. In S2, the temperature T3 for decompression is 130℃-190℃.

9. An MDT-type phenyl hydrogen-containing silicone resin, characterized in that, It is prepared by the preparation method according to any one of claims 1-8.

10. The application of the MDT-type phenyl hydrogen-containing silicone resin as described in claim 9 in the fields of high-temperature resistant coatings, electronic encapsulating adhesives, LED optical encapsulation materials, ceramic precursors, and special adhesives.

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