Silencing mildew-proof organic silica gel as well as preparation method and application thereof

Abstract

The invention discloses silencing and mildew-proof organic silica gel as well as a preparation method and application thereof, and belongs to the technical field of organic silicon binding material polymers. Comprising the following components in parts by weight: 35-45 parts of nano calcium carbonate, 32-40 parts of hydroxyl-terminated polysiloxane, 5-9 parts of silencing powder, 0.5-2.5 parts of glass fiber powder, 5-9 parts of a hyperbranched polymer, 2-5 parts of a hydrophobic surface modifier, 1.5-3 parts of color paste, 1-2 parts of a water-based coupling agent, 1-2 parts of a cross-linking agent, 0.5-2.5 parts of a mildew preventive, 0.4-2 parts of a composite titanide and 0.4-0.7 part of nano silver powder. According to the invention, the nano silver powder and the mildew preventive are compounded, and an inorganic sterilization system is combined, so that broad-spectrum environment-friendly bacteriostasis is realized, and high-humidity long-acting protection is met; the powder is subjected to hydrophobic treatment, moisture is blocked, and high adhesion is kept; silencing powder serves as a core, a sound absorption network is cooperatively formed, the noise reduction capacity is improved, and the device is suitable for multiple scenes.

Description

Technical Field

[0001] This invention relates to the field of polymer technology of organosilicon bonding materials, and in particular to a sound-absorbing and mildew-resistant organosilicon, its preparation method, and its application. Background Technology

[0002] Organosilicon adhesives are formed by the reaction polymerization of specific configuration siloxanes into linear or cross-linked polymers. Marketed simply as silicone, they encompass both rubber-type and resin-type adhesives. Possessing excellent properties such as high-temperature resistance, they are widely used in high-end fields such as aerospace and electronics. Tapes made from them achieve highly efficient and stable sealing and bonding effects on material surfaces.

[0003] In recent years, the requirements for decoration in the residential building sector have increased, heating facilities have become more complete, and room airtightness has been optimized. However, this has led to the accumulation of moisture in areas such as bathrooms and kitchens, which promotes the growth of mold, especially during the rainy season, creating favorable conditions for mold reproduction.

[0004] Currently, the quality of sealing materials used in building interior decoration varies greatly in the market. Single-component room temperature vulcanizing silicone rubber (silicone sealant) is widely used, and it is divided into acidic and neutral types. Acidic sealants release small molecules of acetic acid, producing a strong, pungent odor; some neutral sealants release ketoxime organic compounds, emitting a foul smell. Furthermore, mildew-resistant silicone sealants have many problems in application and production.

[0005] First, there are negative effects of hydrophilic powders: many anti-mildew silicone sealants use hydrophilic powders as raw materials. These powders have strong water absorption. After absorbing water, the adhesive performance of the adhesive decreases significantly. Water breaks the chemical bonds, weakens the adhesion, and is prone to deliquescence in humid environments, which changes the physicochemical properties and affects long-term performance.

[0006] Secondly, the powder lacks anti-mold properties: In most anti-mold adhesive formulations, the powder only serves as a filler or adjuster, and has no anti-mold properties of its own. Mold growth will erode the adhesive structure, reduce strength and stability, shorten service life, and weaken protective effectiveness.

[0007] Furthermore, noise interferes with sleep quality, and the sound-absorbing performance of silicone sealant relies on the synergistic mechanism of porous sound absorption and damping sound absorption. However, existing anti-mildew silicone sealants suffer from uneven dispersion of functional powders and fibers, resulting in uneven sound-absorbing performance, failure of the dual sound absorption mechanism, and impact on bonding strength and stability. Chinese invention patent CN112341678A reports a sound-absorbing silicone rubber for washbasins and its preparation method; however, this silicone rubber does not meet the construction requirements for both indoor and outdoor building applications.

[0008] Given the above, with the increasing airtightness of buildings, mold growth and indoor noise problems coexist in high-humidity environments such as bathrooms and kitchens. Traditional anti-mold silicone sealants fail due to the moisture absorption of hydrophilic fillers, and most fillers lack antibacterial properties, making it difficult to resist performance degradation in humid and hot environments. Existing sound-absorbing materials suffer from fluctuating sound-absorbing performance and decreased bonding stability due to uneven filler dispersion. During the rainy season, condensation on walls exacerbates the risk of combined mold and noise pollution, which single-function materials cannot address. Therefore, developing silicone adhesives that combine uniform acoustic structure, long-lasting mold resistance, and moisture stability is crucial. Summary of the Invention

[0009] The purpose of this invention is to provide a sound-absorbing and mildew-resistant silicone rubber, its preparation method, and its application, which solves the above-mentioned problems. By forming a multi-level porous structure with sound-absorbing powder and nano-calcium carbonate, and combining it with a uniformly dispersed system regulated by hyperbranched compounds, the invention achieves synergistic enhancement of porous sound absorption and damping sound absorption. It can effectively realize the synergistic enhancement of sound absorption performance through the porous structure and damping sound absorption, and synergistically solve the problems of mold control, noise attenuation, and long-term adhesion reliability in humid environments. It has a uniform acoustic structure, long-lasting active mildew prevention, and excellent moisture resistance stability.

[0010] To achieve the above objectives, this invention discloses a sound-absorbing and mildew-resistant silicone rubber compound, comprising the following raw materials by weight:

[0011]

[0012]

[0013] The fitting formula between the NCR value and the amount of sound-absorbing powder added in the sound-absorbing and mildew-resistant silicone rubber is as follows:

[0014] y = 0.83·(1-e -0.15(x-4.5) )

[0015] Where x is the percentage of silencing powder used (%); y is the predicted NCR value.

[0016] Preferably, the nano-calcium carbonate has a particle size of 20-80 nm and a specific surface area ≥40 m². 2 / g, with the surface modified by stearic acid or silane coupling agent.

[0017] Preferably, the hydroxyl-terminated polysiloxane is α,ω-dihydroxypolydimethylsiloxane, with a viscosity of 5000-15000 mPa·s at 25°C, a molecular weight of 50000-150000 g / mol, and a hydroxyl content of 0.5-1.2 wt%.

[0018] Preferably, the nano-silver powder has a particle size of 20-50 nm, a purity of ≥99.9%, and a specific surface area of ​​20-50 m². 2 / g, antibacterial rate ≥99.9% (ISO 22196).

[0019] Preferably, the sound-absorbing powder is at least one of porous silica or expanded perlite; the specific surface area of ​​the porous silica is 300-600 m². 2 / g, pore size 2-50nm, pore volume 0.8-1.5cm³ 3 / g; The bulk density of expanded perlite is 80-150 kg / m³ 3 The particle size D50 is 10-50 μm.

[0020] Preferably, the hyperbranched compound is at least one of hyperbranched polysiloxane, hyperbranched polyester, or hyperbranched polyamide, with a branching degree ≥50% and a molecular weight of 2000-10000 g / mol.

[0021] Preferably, the hydrophobic surface modifier is at least one of stearic acid, octyl dodecyl laurate, dodecyl lauric acid, or perfluorooctyltriethoxysilane.

[0022] Preferably, the color paste includes, but is not limited to, iron oxide red, phthalocyanine blue, phthalocyanine green, and carbon black.

[0023] Preferably, the aqueous coupling agent is at least one of sulfonyl silane coupling agent, amino silane coupling agent, and titanate coupling agent; the crosslinking agent is at least one of tetraethyl orthosilicate, methyltriethoxysilane, and vinyltriethoxysilane; the antifungal agent is an organic antifungal agent, at least one of pyridinethione compounds and isothiazolinone compounds; and the composite titanium compound is prepared by compounding tetraisopropyl titanate and bis(acetylacetonyl)diisopropyl titanate in a mass ratio of 2:0.5-2.

[0024] Preferably, the aqueous coupling agent is at least one of Kenrich KR-38S, TMC-102, and KR-238T; the antifungal agent is Lonza Zinc Omadine or THOR. At least one of LPC11.

[0025] This invention also provides a method for preparing the above-mentioned sound-absorbing and mildew-resistant silicone rubber, comprising the following steps:

[0026] S1, Powder hydrophobic coupling modification

[0027] Nano-calcium carbonate, color paste, nano-silver powder, sound-absorbing powder, glass fiber powder, and hydrophobic surface modifier are added to a planetary mixer, and the mixer is turned on and stirred for 0.5-2 hours to hydrophobize the mixed powder. Then, an aqueous coupling agent is added and stirred for 1-2 hours under a vacuum of 0.09 MPa to carry out coupling modification.

[0028] S2, Matrix Construction

[0029] Hydroxyl-terminated polysiloxane and hyperbranched compound were added to the hydrophobically coupled modified powder and stirred under vacuum of 0.09 MPa for 1-4 h.

[0030] S3, Cross-linking curing and anti-mildew function

[0031] Add crosslinking agent, composite titanium compound and mildew inhibitor to the above-treated material, stir for 0.5-2.5 hours under vacuum of 0.09 MPa to disperse and mix evenly, and obtain the finished product.

[0032] The sound-absorbing and mildew-resistant silicone provided by this invention can be applied in the fields of construction and decoration, industrial and equipment manufacturing, or special equipment.

[0033] Therefore, the present invention has the following beneficial effects:

[0034] 1. The sound-absorbing powder of the present invention forms a multi-level porous structure with nano-calcium carbonate, and combined with a uniform dispersion system regulated by hyperbranched compounds, it achieves synergistic effect of porous sound absorption and damping sound absorption, and can effectively achieve sound absorption performance.

[0035] 2. This invention utilizes nano-silver powder and antifungal agents to form a broad-spectrum antibacterial system, which can destroy the cell membrane of mold and inhibit the activity of metabolic enzymes, achieving an antifungal level of 0 (no mold growth for 28 days), and the slow-release properties of nano-silver powder ensure long-lasting antibacterial ability.

[0036] 3. This invention reduces the hydrophilicity of the filler (contact angle > 110°) and blocks the water molecule penetration path through the synergistic effect of hydrophobic modifier and methyltriethoxysilane coupling agent, and the bonding strength retention rate after humid heat aging is > 90%, thus solving the problem of traditional colloid deliquescence failure.

[0037] 4. This invention solves the problems of easy aggregation and uneven performance in polymer matrices by selecting inorganic porous sound-absorbing powders that are inherently mildew-resistant and combining them with hydrophobic and coupling technologies. Simultaneously, the introduction of nano-silver and photocatalytic titanium compounds, along with the mildew inhibitor, constructs a synergistic antibacterial system, achieving active and long-lasting mildew and antibacterial effects. By deeply integrating the two functions of sound absorption and mildew prevention, this invention successfully overcomes the performance degradation problem caused by the simple stacking of functions in traditional technologies, which makes it difficult to simultaneously achieve "high-efficiency sound absorption" and "long-lasting mildew prevention," ultimately resulting in a stable and reliable integrated high-performance product.

[0038] The technical solution of the present invention will be further described in detail below through embodiments. Detailed Implementation

[0039] The technical solution of the present invention will be further described below through embodiments.

[0040] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0041] Example 1:

[0042] This embodiment provides a sound-absorbing and mildew-resistant silicone rubber, comprising the following components by weight:

[0043] 35 parts of nano-calcium carbonate;

[0044] 32 parts of α,ω-dihydroxypolydimethylsiloxane;

[0045] 1.5 parts carbon black

[0046] 0.4 parts of nano silver powder

[0047] Silencing powder: pore size 2-50nm, pore volume 0.8-1.5cm³ 3 / g porous silica 9 parts;

[0048] 2.5 parts glass fiber powder;

[0049] Hydrophobic surface modifier: 5 parts of octyl dodecyl fluorolaurate;

[0050] Aqueous coupling agent: 1 part of Kenrich KR-38S (USA);

[0051] Hyperbranched compounds: 9 parts of hyperbranched polysiloxanes with a branching degree ≥50%;

[0052] Crosslinking agent: 1 part tetraethyl orthosilicate;

[0053] Composite titanium compound: 0.88 parts tetraisopropyl titanate + 0.22 parts bis(acetylacetonyl)diisopropyl titanate;

[0054] Antifungal agent: 2.5 parts of Lonza Zinc Omadine;

[0055] Its preparation process includes the following steps, with the materials added according to the above proportions:

[0056] 1. Add nano-calcium carbonate, carbon black, nano-silver powder, porous silica, glass fiber powder and octyl dodecyl laurate with a particle size of 20-80nm to a planetary mixer, start stirring and stir for 0.5h to complete the hydrophobic coating of the powder, add American Kenrich KR-38S, and stir for 1h under vacuum of 0.09MPa to complete the coupling modification of the powder;

[0057] 2. Add α,ω-dihydroxy polydimethylsiloxane and hyperbranched polysiloxane with a branching degree ≥50% to the coupling-modified powder, and stir under vacuum of 0.09 MPa for 1 h; add tetraethyl orthosilicate, tetraisopropyl titanate and bis(acetylacetonate) diisopropyl titanate complex and Lonza Zinc Omadine, and stir under vacuum of 0.09 MPa for 0.5 h to disperse and mix evenly to obtain the finished product.

[0058] Example 2:

[0059] This embodiment provides a sound-absorbing and mildew-resistant silicone rubber, comprising the following components by weight:

[0060] 39 parts of α,ω-dihydroxypolydimethylsiloxane;

[0061] 36 parts of nano-calcium carbonate;

[0062] Silencing powder: bulk density 80-150 kg / m³ 3 Five portions of expanded perlite with a particle size D50 of 10-50 μm;

[0063] 1.5 parts glass fiber powder;

[0064] 3 parts Phthalocyanine Blue;

[0065] Hyperbranched compound: 7 parts hyperbranched polyamide;

[0066] Hydrophobic surface modifier: 3 parts perfluorooctyltriethoxysilane;

[0067] Aqueous coupling agent: 1.5 parts of Kenrich TMC-1021 (USA);

[0068] Crosslinking agent: 1.5 parts of methyltriethoxysilane;

[0069] 0.5 parts of nano silver powder;

[0070] Composite titanium compound: 0.25 parts tetraisopropyl titanate + 0.25 parts bis(acetylacetonyl)diisopropyl titanate;

[0071] Antifungal agent: THOR LPC111.5 copies.

[0072] Its preparation process includes the following steps, with the materials added according to the above proportions:

[0073] 1. Add nano-calcium carbonate, phthalocyanine blue, nano-silver powder, expanded perlite, glass fiber powder, and perfluorooctyltriethoxysilane to a planetary mixer, start stirring, and stir for 1.2 h to complete the hydrophobic coating of the powder; add 1.5 parts of American Kenrich TMC-102, and stir under vacuum of 0.09 MPa for 1.5 h to complete the coupling modification of the powder.

[0074] 2. Add α,ω-dihydroxypolydimethylsiloxane and hyperbranched polyamide with a branching degree ≥50% to the coupled-modified powder, and stir under vacuum of 0.09 MPa for 2.5 h; add methyltriethoxysilane, tetraisopropyl titanate and bis(acetylacetonyl)diisopropyl titanate complex and THOR. LPC11 was stirred under a vacuum of 0.09 MPa for 1.5 hours to disperse and mix evenly, thus obtaining the finished product.

[0075] Example 3:

[0076] This embodiment provides a sound-absorbing and mildew-resistant silicone rubber, comprising the following components by weight:

[0077] 32 parts of α,ω-dihydroxypolydimethylsiloxane;

[0078] Hyperbranched compound: 2 parts hyperbranched polyester + 3 parts hyperbranched polyamide;

[0079] 44 parts of nano-calcium carbonate;

[0080] Silencing powder: 7 parts porous silica;

[0081] 0.5 parts glass fiber powder;

[0082] Pigment: 1.3 parts phthalocyanine blue + 1 part phthalocyanine green;

[0083] Hydrophobic surface modifier: 0.7 parts stearic acid + 1.3 parts octyl dodecyl laurate;

[0084] Aqueous coupling agent: 0.5 parts of American Kenrich TMC-1020 + 1.5 parts of American Kenrich KR-238T;

[0085] Crosslinking agent: 0.6 parts methyltriethoxysilane + 1.4 parts vinyltriethoxysilane;

[0086] 0.7 parts of nano silver powder;

[0087] Composite titanium compound: 1.4 parts tetraisopropyl titanate + 0.6 parts bis(acetylacetonyl)diisopropyl titanate;

[0088] Antifungal agent: THOR LPC110.5 copies.

[0089] Its preparation process includes the following steps, with the materials added according to the above proportions:

[0090] 1. Nano-calcium carbonate, phthalocyanine blue, phthalocyanine green, and nano-silver powder are used, with pore sizes of 2-50 nm and pore volumes of 0.8-1.5 cm³. 3 / g porous silica, glass fiber powder, stearic acid, and octyl dodecyl laurate were added to a planetary mixer and stirred for 2 hours to modify the hydrophobicity of the powder. 0.5 parts of American Kenrich KRTMC-102 and 1.5 parts of American Kenrich KRKR-238T were added and stirred for 2 hours under a vacuum of 0.09 MPa to complete the coupling modification of the powder.

[0091] 2. Add α,ω-dihydroxypolydimethylsiloxane, hyperbranched polyester with a branching degree ≥50%, and hyperbranched polyamide with a branching degree ≥50% to the coupling-modified powder, and stir under vacuum of 0.09 MPa for 4 hours; add methyltriethoxysilane, vinyltriethoxysilane, tetraisopropyl titanate and bis(acetylacetonate)diisopropyl titanate complex, and THOR. LPC11 was stirred under a vacuum of 0.09 MPa for 2.5 hours to disperse and mix evenly, thus obtaining the finished product.

[0092] Comparative Example 1

[0093] This comparative example is a commercially available silicone sealant, model Dow Corning 732 silicone, which can be used for bonding, sealing, filling gaps, and embedding connections of parts, and can also be used for sealing equipment or containers that come into contact with food.

[0094] Comparative Example 2

[0095] This comparative example is a commercially available silicone sealant, model number Dongfang Yuhong WS101 Kitchen and Bathroom Anti-mildew Neutral Silicone Sealant, which is widely used for sealing and bonding materials such as flooring, glass, and ceramics in damp areas such as kitchens, bathrooms, and basements.

[0096] Performance testing

[0097] The sound-absorbing and mildew-resistant silicone prepared in Examples 1 to 3 of this invention, as well as the conventional commercially available products in Comparative Examples 1 and 2, were subjected to performance tests.

[0098] 1. Room temperature curing speed: According to GB / T 32369-2015 "Determination of curing degree of sealant", use a specific curing cup, put the sealant into the cup, and check the curing state of the sealant regularly at room temperature to determine the curing speed.

[0099] 2. Sound attenuation: A sealant sample is placed in a reverberation chamber, and its sound attenuation effect is judged by measuring the reverberation time and sound pressure level of the sound source in the chamber.

[0100] In this invention, to accurately describe the relationship between noise reduction performance and the amount of noise reduction powder added, a mathematical model was obtained by fitting experimental data. This model can accurately predict the changing trend of noise reduction performance (NCR value) and provides a theoretical basis for the synergistic damping and sound absorption enhancement design through a multi-level porous structure formed by noise reduction powder and nano-calcium carbonate. The fitting formula is shown below:

[0101] y = 0.83·(1-e -0.15(x-4.5) )

[0102] Where: x is the percentage of silencing powder used (%); y is the predicted NCR value.

[0103] 3. Anti-mildew properties: According to GB / T 1741-2020 "Test Method for Anti-mildew Properties of Coating Film", the sealant sample is placed in a culture medium containing specific mold species and cultured for a certain period of time under specified temperature and humidity conditions. The mold growth on the sample surface is observed, and the anti-mildew level is evaluated according to indicators such as the area of ​​mold growth.

[0104] The performance test results are shown in Table 1 below:

[0105] Table 1. Performance of Sound-absorbing and Mildew-resistant Organosilicon

[0106]

[0107] The test results above show that the sound-absorbing and mildew-resistant silicone prepared by this invention has good drying performance at room temperature. At the same time, the comparison of the implementation cases shows that the sound-absorbing powder introduced into the formula can effectively improve the sound-absorbing performance. The use of nano silver powder and mildew inhibitor to form a broad-spectrum antibacterial system can destroy the cell membrane of mold and inhibit the activity of metabolic enzymes, and the mildew resistance level reaches level 0 (no mold growth for 28 days).

[0108] Therefore, this invention discloses a sound-absorbing and mildew-resistant silicone rubber, its preparation method, and its application. Through the combined effect of nano-silver powder and mildew inhibitor, combined with an inorganic bactericidal system, it achieves a broad-spectrum antibacterial effect and is environmentally friendly, meeting the long-term protection needs of high-humidity scenarios. The powder is composite hydrophobically treated with hydrophobic surface modifiers and water-based coupling agents, which not only prevents moisture from growing mold, but also maintains high adhesion strength with the silicone oil matrix through the coupling agent. At the same time, with the sound-absorbing powder as the core, it forms a multi-scale sound-absorbing network with hyperbranched compounds and glass fiber powder, which significantly improves the ability to dissipate mechanical vibration and sound wave energy, making it suitable for noise reduction scenarios such as buildings and automobiles.

[0109] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A sound-deadening mold-preventing silicone gel, characterized by comprising: The raw material comprises the following weight components: nano calcium carbonate 35-45 parts, hydroxyl-terminated polysiloxane 32-40 parts, sound-absorbing powder 5-9 parts, glass fiber powder 0.5-2.5 parts, hyperbranched compound 5-9 parts, hydrophobic surface modifier 2-5 parts, color paste 1.5-3 parts, water-based coupling agent 1-2 parts, crosslinking agent 1-2 parts, mildew-proof agent 0.5-2.5 parts, composite titanium compound 0.4-2 parts, nano silver powder 0.4-0.7 parts; The fitting formula between the NCR value of the sound-absorbing and mildew-proof organic silicone glue and the addition amount of the sound-absorbing powder is as follows: y = 0.83 · (1 - e -0.15(x-4.5) ) Wherein, x is the sound-absorbing powder amount percentage (%); y is the predicted NCR value.

2. The sound-damping mold-preventing silicone gel according to claim 1, characterized by, The nano calcium carbonate has a particle size of 20-80 nm, a specific surface area of ≥40 m 2 / g, and a surface modified by stearic acid or a silane coupling agent. The hydroxyl-terminated polysiloxane is α, ω-dihydroxydimethylpolysiloxane, the viscosity at 25 DEG C is 5000-15000 mPa s, the molecular weight is 50000-150000 g / mol, and the hydroxyl content is 0.5-1.2 wt %. The nano-silver powder has a particle size of 20-50 nm, a purity of ≥99.9%, a specific surface area of 20-50 m 2 / g, and an antibacterial rate of ≥99.9%.

3. The sound-damping mold-preventing silicone gel according to claim 1, characterized in that, The sound deadening powder is at least one of porous silica or expanded perlite; the specific surface area of the porous silica is 300-600 m 2 / g, the pore size is 2-50 nm, and the pore volume is 0.8-1.5 cm 3 / g; the bulk density of the expanded perlite is 80-150 kg / m 3 , and the particle size D50 is 10-50 μm.

4. The sound-damping mold-preventing silicone gel according to claim 1, wherein The hyperbranched compound is at least one of hyperbranched polysiloxane, hyperbranched polyester or hyperbranched polyamide, the branching degree is greater than or equal to 50%, and the molecular weight is 2000-10000 g / mol.

5. The sound-damping mold-preventing silicone gel according to claim 1, wherein The hydrophobic surface modifier is at least one of stearic acid, octyl dodecafluoro laurate, dodecafluoro lauric acid or perfluoro octyl triethoxysilane.

6. The sound-damping mold-preventing silicone gel according to claim 1, wherein The color paste is at least one of iron oxide red, phthalocyanine blue, phthalocyanine green or carbon black.

7. The sound-absorbing and mildew-proof organic silicone glue according to claim 1, characterized in that, The water-based coupling agent is at least one of a sulfonyl silane coupling agent, an amino silane coupling agent or a titanate coupling agent; The crosslinking agent is at least one of tetraethyl orthosilicate, methyl triethoxysilane or vinyl triethoxysilane; The mildew-proof agent is an organic mildew-proof agent, which is at least one of a pyridinethione compound or an isothiazolinone compound; The composite titanium compound is compounded from tetraisopropyl titanate and bis(acetylacetonyl) diisopropyl titanate at a mass ratio of 2:0.5-2.

8. The sound-damping mold-preventing silicone gel according to claim 7, wherein The waterborne coupling agent is at least one of Ken-Reach KR-38S, TMC-102, KR-238T; the mildewcide is Rohm & Haas Zinc Omadine, THOR at least one of LPC11.

9. A method of preparing the sound-damping mold-preventing silicone gel according to any one of claims 1 to 8, characterized by, The method comprises the following steps: S1, powder hydrophobic coupling modification According to weight parts, nano calcium carbonate, color paste, nano silver powder, sound-absorbing powder, glass fiber powder and hydrophobic surface modifier are added into a planetary stirrer, stirring is started, the mixed powder is hydrophobized for 0.5-2 h, and water-based coupling agent is added, stirring is carried out under a vacuum degree of 0.09 MPa for 1-2 h, and coupling modification is carried out; S2, matrix construction According to weight parts, hydroxyl-terminated polysiloxane and hyperbranched compound are added into the powder after hydrophobic coupling modification, and stirring is carried out under a vacuum degree of 0.09 MPa for 1-4 h; S3, crosslinking, curing and mildew-proof function According to weight parts, crosslinking agent, composite titanium compound and mildew-proof agent are added into the above treated material, stirring is carried out under a vacuum degree of 0.09 MPa for 0.5-2.5 h, and the finished product is prepared after dispersion and mixing.

10. Use of the sound-damping mold-preventing silicone gel according to any one of claims 1 to 8, characterized in that The sound-absorbing and mildew-proof organic silicone glue is applied in the fields of building and decoration, industry and equipment manufacturing or special equipment.

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