Copper-color-imitating mildew-proof silica gel and preparation method thereof

Abstract

The invention discloses copper-color-imitating mildew-proof silica gel and a preparation method of the copper-color-imitating mildew-proof silica gel, and relates to the technical field of organic silica gel. The invention relates to a high-strength sound-absorbing coating which comprises the following components in parts by weight: 54-60 parts of methyl hyperbranched polysiloxane, 10-17 parts of a sound-absorbing toughening agent, 3-7 parts of copper color paste, 0.8-1.4 parts of a fluorosilane coupling agent, 0.8-1.4 parts of a long-acting mildew preventive, 8-11 parts of fumed silica, 6-8 parts of an alcohol type coupling agent, 0.8-1.4 parts of an alcohol type cross-linking agent, 0.6-2.8 parts of a composite titanide, 0.3-1.4 parts of a deep curing accelerator and 0.8-3.6 parts of silicone oil. The prepared copper-color-imitating mildew-proof silica gel has excellent copper-color-imitating and mildew-proof dual performance, meanwhile, an alcohol type system selected in the formula meets the highest domestic VOC standard, the environmental protection performance is excellent, the silica gel can be effectively used in humid environments such as bathrooms and kitchens, and the silica gel has wide application prospects in the indoor and outdoor fields and other fields.

Description

Technical Field

[0001] This invention relates to the field of silicone technology, and in particular to a copper-colored anti-mildew silicone and its preparation method. Background Technology

[0002] Silicone adhesives are composed of one or more identical or different linear, cyclic, or branched siloxanes, synthesized through equilibrium, addition, or condensation reactions under different catalyst systems, resulting in high-molecular-weight linear or cross-linked siloxanes. While the application range of silicone adhesive tapes is gradually expanding, allowing for surface sealing and bonding of materials such as glass, metal sheets, and plastic sheets, the proliferation of mold on interior walls and corners during the rainy season seriously impacts people's health and living environment.

[0003] Currently, the most common sealing material for interior building decoration is single-component room temperature vulcanizing silicone rubber. Although adding anti-mold agents can prevent mold growth, it is toxic and affects human health. In recent years, consumers' pursuit of high-quality home products has led to a steady increase in the sales of copper and imitation copper door and window hardware. However, the use of ketoxime silicone sealants on imitation copper and copper substrates has many limitations. For example, ketoxime silicone sealants have poor chemical compatibility and poor moisture resistance and mildew prevention. Long-term use will degrade the performance of the copper material in the sealed area, affecting the stability and service life of the entire structure. In related technologies, although a heat-resistant, mildew-resistant, and non-whitening silicone rubber for folding kettles and its preparation method are disclosed, this silicone rubber can be used on the body of folding kettles and can achieve a highly effective mildew prevention effect with long-term use. However, its compatibility with imitation copper and copper substrates is poor, and it cannot meet the requirements for strong adhesion.

[0004] Therefore, developing a new generation of environmentally friendly silicone that can be used with copper-imitation and copper door and window hardware products is an inevitable requirement of social development. Summary of the Invention

[0005] The purpose of this invention is to provide a copper-colored anti-mildew silicone and its preparation method, so as to solve the problems of poor chemical compatibility and poor moisture resistance and anti-mildew performance of silicone for sealing copper materials.

[0006] To achieve the above objectives, the present invention provides a copper-colored anti-mildew silicone, comprising, by weight: 54-60 parts of methyl hyperbranched polysiloxane, 10-17 parts of sound-absorbing and toughening agent, 3-7 parts of copper color paste, 0.8-1.4 parts of fluorosilane coupling agent, 0.8-1.4 parts of long-lasting anti-mildew agent, 8-11 parts of fumed silica, 6-8 parts of alcohol-type coupling agent, 0.8-1.4 parts of alcohol-type crosslinking agent, 0.6-2.8 parts of composite titanium compound, 0.3-1.4 parts of deep curing accelerator, and 0.8-3.6 parts of silicone oil.

[0007] Preferably, the sound-absorbing and toughening agent is at least one of hollow glass microspheres and glass fiber powder.

[0008] Preferably, the copper color paste is at least one of copper gold powder pigment dispersion, copper phthalocyanine color paste, and nano copper powder composite color paste.

[0009] Preferably, the composite titanium compound is at least one of bis(acetylacetonyl)diisopropyl titanate and an organic bismuth catalyst.

[0010] Preferably, the alcohol-type coupling agent is at least one of methyltriethoxysilane, vinyltriethoxysilane, γ-aminopropyltriethoxysilane, and γ-mercaptopropyltrimethoxysilane; and the alcohol-type crosslinking agent is at least one of γ-chloropropyltriethoxysilane, methyltrimethoxysilane, phenyltrimethoxysilane, vinyltrimethoxysilane, and tetraethyl orthosilicate.

[0011] Preferably, the deep curing accelerator is at least one selected from dibutyltin dilaurate, stannous octoate, an organobismuth catalyst, and a tertiary amine compound. The tertiary amine compound is one selected from triethylamine and N,N-dimethylbenzylamine.

[0012] Preferably, the fluorosilane coupling agent is at least one of perfluorooctyltriethoxysilane and heptadecafluorodecyltrimethoxysilane; the long-lasting antifungal agent is silver-coated copper powder.

[0013] This invention also provides a method for preparing copper-colored anti-mildew silicone, comprising the following steps:

[0014] S1. According to the weight ratio, stir 54-60 parts of methyl hyperbranched polysiloxane for 30-120 minutes, then add 8-11 parts of fumed silica and 0.8-3.6 parts of silicone oil and stir for 30-40 minutes to obtain the first mixture;

[0015] S2. Add 10-17 parts of sound-absorbing toughening agent, 0.8-1.4 parts of fluorosilane coupling agent, 6-8 parts of alcohol coupling agent and 0.6-2.8 parts of composite titanium compound to the first mixture, stir for 45 min-60 min to obtain the second mixture;

[0016] S3. Add 0.8-1.4 parts of long-lasting anti-mildew agent, 3-7 parts of copper color paste and 0.3-1.4 parts of deep curing accelerator to the second mixture. Stir under a vacuum of 0.09 MPa for 30-40 minutes. Then add 0.8-1.4 parts of alcohol-based crosslinking agent and stir under a vacuum of 0.09 MPa for 20-30 minutes to obtain the finished product, namely, imitation copper-colored anti-mildew silicone.

[0017] Preferably, the method for preparing the methyl hyperbranched polysiloxane includes the following steps:

[0018] (1) Under a nitrogen atmosphere, trimethylsiloxypropyltriol tetra(dimethylsiloxy)silane initiator is dissolved in anhydrous toluene, and then an alkaline catalyst is added. The temperature is raised to 60℃~80℃ and stirred for 30min~60min to carry out a neutralization reaction to generate potassium siloxane salt; the alkaline catalyst is potassium hydroxide.

[0019] (2) Under the conditions of 80℃~100℃, octamethylcyclotetrasiloxane monomer is added dropwise to potassium siloxane, the temperature is raised to 120℃~150℃, and the ring-opening polymerization reaction is carried out for 2h~6h to obtain the reaction solution.

[0020] (3) Cool the reaction solution to 60°C, add an acidic terminator to terminate the reaction, and distill under reduced pressure to obtain the crude product; the acidic terminator is one of glacial acetic acid and acidic resin.

[0021] (4) The crude product was dissolved in an organic solvent and purified by silica gel column chromatography to obtain methyl hyperbranched polysiloxane.

[0022] Preferably, the mass ratio of the trimethylsiloxypropyltriol initiator to the octamethylcyclotetrasiloxane is 0.01 to 0.05:1;

[0023] The mass ratio of anhydrous totoluene to octamethylcyclotetrasiloxane is 0.5 to 1:1;

[0024] The mass ratio of the alkaline catalyst to the octamethylcyclotetrasiloxane is 0.001 to 0.005:1.

[0025] Preferably, the organic solvent is n-hexane.

[0026] Preferably, the eluent used in the silica gel column chromatography purification is a mixture of n-hexane and toluene, and the volume ratio of n-hexane to toluene is 3:1.

[0027] In summary, the copper-colored anti-mildew silicone and its preparation method provided by this invention have the following advantages compared with traditional technologies:

[0028] The copper-colored anti-mildew silicone prepared by this invention incorporates methyl hyperbranched polysiloxane, which has a cage-like structure that improves the base color and the fixation effect of the copper color paste, ensuring long-term protection of the copper color. The fluorosilane coupling agent increases the fluorine content in the silicone, inhibiting mold growth and improving the silicone's hydrophobic and anti-mildew properties, achieving excellent anti-mildew effects and protection of the copper color in humid environments, while also exhibiting good weather resistance. The alcohol-based coupling agent and alcohol-based crosslinking agent make the copper-colored anti-mildew silicone an alcohol-based system, complying with the latest domestic volatile organic compound (VOC) emission standards, making it environmentally friendly and suitable for a wide range of applications. The sound-absorbing and toughening agent improves sound absorption performance. Therefore, it has broad prospects in many fields, including indoor and outdoor applications.

[0029] The technical method of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0030] Figure 1 This is a flowchart of a method for preparing a copper-colored anti-mildew silicone sealant. Detailed Implementation

[0031] The technical method of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0033] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0034] 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.

[0035] The following is a specific embodiment of the copper-colored anti-mildew silicone and its preparation method provided in this application:

[0036] Example 1

[0037] A copper-colored anti-mildew silicone, by weight, comprises: 60 parts of methyl hyperbranched polysiloxane, 8 parts of fumed silica, 3.2 parts of silicone oil, 10 parts of hollow glass microspheres, 0.8 parts of perfluorooctyltriethoxysilane, 8 parts of methyltriethoxysilane, 2.8 parts of bis(acetylacetonyl)diisopropyl titanate, 1.4 parts of copper-coated silver powder from Guangzhou Beijun Industrial Materials, 3 parts of copper-gold powder pigment dispersion, 1.4 parts of dibutyltin dilaurate, and 1.4 parts of γ-chloropropyltriethoxysilane.

[0038] A method for preparing a copper-colored anti-mildew silicone sealant, such as... Figure 1 As shown, it includes the following steps:

[0039] S1. Preparation of methyl hyperbranched polysiloxane, the preparation method includes the following steps:

[0040] (1) In a dry reaction vessel, under a nitrogen atmosphere, trimethylsiloxypropyltriol initiator is dissolved in anhydrous toluene, then potassium hydroxide (KOH) is added, the temperature is raised to 80°C, and the mixture is stirred for 30 min. After neutralization reaction, the hydroxyl groups in the trimethylsiloxypropyltriol initiator react with KOH to generate potassium siloxane salt.

[0041] (2) At 100°C, dried octamethylcyclotetrasiloxane (D4) monomer was added dropwise to potassium siloxane, and the temperature was raised to 120°C. After 6 hours of ring-opening polymerization, the reaction solution was obtained.

[0042] The mass ratio of trimethylsiloxypropyltriol initiator to octamethylcyclotetrasiloxane is 0.01:1; the mass ratio of anhydrous toluene to octamethylcyclotetrasiloxane is 0.5:1; and the mass ratio of alkaline catalyst to octamethylcyclotetrasiloxane is 0.001:1.

[0043] (3) Cool the reaction solution to 60°C, add glacial acetic acid as an acidic terminator to terminate the reaction, and remove toluene and low-boiling substances by vacuum distillation to obtain the crude product.

[0044] (4) The crude product was dissolved in hexane, and a mixture of hexane and toluene in a volume ratio of 3:1 was used as the eluent. The catalyst residue was removed by silica gel column chromatography, and then the product was dried under vacuum to obtain methyl hyperbranched polysiloxane.

[0045] S2. According to the weight ratio, add 60 parts of methyl hyperbranched polysiloxane into a planetary mixer and stir for 30 minutes. Then add 8 parts of fumed silica with a particle size of 7 nm and 3.2 parts of silicone oil and stir for 30 minutes to obtain the first mixture.

[0046] S3. Add 10 parts of hollow glass microspheres, 0.8 parts of perfluorooctyltriethoxysilane, 8 parts of methyltriethoxysilane and 2.8 parts of bis(acetylacetonyl)diisopropyl titanate to the first mixture, stir for 45 min to obtain the second mixture;

[0047] S4. Add 1.4 parts of Guangzhou Beijun Industrial Materials silver-coated copper powder, 3 parts of copper-gold powder pigment dispersion and 1.4 parts of dibutyltin dilaurate to the second mixture. Stir under a vacuum of 0.09 MPa for 30 min, then add 1.4 parts of γ-chloropropyltriethoxysilane and stir under a vacuum of 0.09 MPa for 20 min to obtain the finished product, namely, copper-colored anti-mildew silicone.

[0048] Example 2

[0049] A copper-colored anti-mildew silicone, by weight, comprises: 54 parts of methyl hyperbranched polysiloxane, 11 parts of fumed silica, 1.1 parts of silicone oil, 17 parts of glass fiber powder, 1.4 parts of heptadecafluorodecyltrimethoxysilane, 6 parts of vinyltriethoxysilane, 0.6 parts of organobismuth catalyst DY-20, 0.8 parts of Suzhou Fudi New Material Technology silver-coated copper powder, 7 parts of copper phthalocyanine pigment, 0.3 parts of stannous octoate, and 0.8 parts of methyltrimethoxysilane.

[0050] A method for preparing a copper-colored anti-mildew silicone sealant includes the following steps:

[0051] S1. Preparation of methyl hyperbranched polysiloxane, the preparation method includes the following steps:

[0052] (1) In a dry reaction vessel, under a nitrogen atmosphere, trimethylsiloxypropyltriol initiator is dissolved in anhydrous toluene, then potassium hydroxide (KOH) is added, the temperature is raised to 80°C, and the mixture is stirred for 30 min. After neutralization reaction, the hydroxyl groups in the trimethylsiloxypropyltriol initiator react with KOH to generate potassium siloxane salt.

[0053] (2) At 100°C, dried octamethylcyclotetrasiloxane (D4) monomer was added dropwise to potassium siloxane, and the temperature was raised to 150°C. After 2 hours of ring-opening polymerization, the reaction solution was obtained.

[0054] The mass ratio of trimethylsiloxypropyltriol initiator to octamethylcyclotetrasiloxane is 0.05:1; the mass ratio of anhydrous toluene to octamethylcyclotetrasiloxane is 1:1; and the mass ratio of alkaline catalyst to octamethylcyclotetrasiloxane is 0.005:1.

[0055] (3) Cool the reaction solution to 60°C, add acidic terminator acidic resin to terminate the reaction, and remove toluene and low-boiling substances by vacuum distillation to obtain crude product.

[0056] (4) The crude product was dissolved in hexane, and a mixture of hexane and toluene in a volume ratio of 3:1 was used as the eluent. The catalyst residue was removed by silica gel column chromatography, and then the product was dried under vacuum to obtain methyl hyperbranched polysiloxane.

[0057] S2. According to the weight ratio, 54 parts of methyl hyperbranched polysiloxane were added to a planetary mixer and stirred for 120 min. Then, 11 parts of fumed silica with a particle size of 30 nm and 1.1 parts of silicone oil were added and stirred for 40 min to obtain the first mixture.

[0058] S3. Add 17 parts of glass fiber powder, 1.4 parts of heptadecafluorodecyltrimethoxysilane, 6 parts of vinyltriethoxysilane and 0.6 parts of organobismuth catalyst DY-20 to the first mixture, stir for 60 min to obtain the second mixture;

[0059] S4. Add 0.8 parts of Suzhou Fudi New Material Technology silver-coated copper powder, 7 parts of copper phthalocyanine pigment and 0.3 parts of stannous octoate to the second mixture. Stir under a vacuum of 0.09 MPa for 40 min, then add 0.8 parts of methyltrimethoxysilane and stir under a vacuum of 0.09 MPa for 30 min to obtain the finished product, namely copper-colored anti-mildew silicone.

[0060] Example 3

[0061] A copper-colored anti-mildew silicone, by weight, comprises: 56 parts of methyl hyperbranched polysiloxane, 10 parts of fumed silica, 2 parts of silicone oil, 7 parts of hollow glass microspheres, 7 parts of glass fiber powder, 0.4 parts of perfluorooctyltriethoxysilane, 0.7 parts of heptadecafluorodecyltrimethoxysilane, 5 parts of γ-aminopropyltriethoxysilane, 2 parts of γ-mercaptopropyltrimethoxysilane, 0.8 parts of bis(acetylacetonyl)diisopropyltitanate, 1 part of organic bismuth catalyst DY-201, 0.5 parts of silver-coated copper powder from Guangzhou Beijun Industrial Materials, 0.5 parts of silver-coated copper powder from Suzhou Fudi New Materials Technology, 3 parts of copper phthalocyanine color paste, 2 parts of nano-copper powder composite color paste, 0.3 parts of bismuth isooctanoate, 0.7 parts of N,N-dimethylbenzylamine, 0.5 parts of phenyltrimethoxysilane, 0.3 parts of vinyltrimethoxysilane, and 0.3 parts of tetraethyl orthosilicate.

[0062] A method for preparing a copper-colored anti-mildew silicone sealant includes the following steps:

[0063] S1. Preparation of methyl hyperbranched polysiloxane, the preparation method includes the following steps:

[0064] (1) In a dry reaction vessel, under a nitrogen atmosphere, trimethylsiloxypropyltriol initiator is dissolved in anhydrous toluene, then potassium hydroxide (KOH) is added, the temperature is raised to 70°C, and the mixture is stirred for 50 min. After neutralization reaction, the hydroxyl groups in the trimethylsiloxypropyltriol initiator react with KOH to generate potassium siloxane salt.

[0065] (2) At 90°C, dried octamethylcyclotetrasiloxane (D4) monomer was added dropwise to potassium siloxane, and the temperature was raised to 130°C to carry out ring-opening polymerization for 3.5 h to obtain the reaction solution.

[0066] The mass ratio of trimethylsiloxypropyltriol initiator to octamethylcyclotetrasiloxane is 0.03:1; the mass ratio of anhydrous toluene to octamethylcyclotetrasiloxane is 0.75:1; and the mass ratio of alkaline catalyst to octamethylcyclotetrasiloxane is 0.004:1.

[0067] (3) Cool the reaction solution to 60°C, add glacial acetic acid as an acidic terminator to terminate the reaction, and remove toluene and low-boiling substances by vacuum distillation to obtain the crude product.

[0068] (4) The crude product was dissolved in hexane, and a mixture of hexane and toluene in a volume ratio of 3:1 was used as the eluent. The catalyst residue was removed by silica gel column chromatography, and then the product was dried under vacuum to obtain methyl hyperbranched polysiloxane.

[0069] S2. According to the weight ratio, add 56 parts of methyl hyperbranched polysiloxane into a planetary mixer and stir for 60 minutes. Then add 10 parts of fumed silica with a particle size of 40 nm and 2 parts of silicone oil and stir for 35 minutes to obtain the first mixture.

[0070] S3. Add 7 parts hollow glass microspheres, 7 parts glass fiber powder, 0.4 parts perfluorooctyltriethoxysilane, 0.7 parts heptadecafluorodecyltrimethoxysilane, 5 parts γ-aminopropyltriethoxysilane, 2 parts γ-mercaptopropyltrimethoxysilane, 0.8 parts bis(acetylacetonyl)diisopropyltitanate and 1 part organic bismuth catalyst DY-20 to the first mixture, stir for 55 min to obtain the second mixture;

[0071] S4. Add 0.5 parts of Guangzhou Beijun Industrial Materials silver-coated copper powder, 0.5 parts of Suzhou Fudi New Materials Technology silver-coated copper powder, 3 parts of copper phthalocyanine color paste, 2 parts of nano copper powder composite color paste, 0.3 parts of bismuth isooctanoate and 0.7 parts of N,N-dimethylbenzylamine to the second mixture. Stir under a vacuum of 0.09 MPa for 35 min, then add 0.5 parts of phenyltrimethoxysilane, 0.3 parts of vinyltrimethoxysilane and 0.3 parts of tetraethyl orthosilicate. Stir under a vacuum of 0.09 MPa for 25 min to obtain the finished product, namely, copper-colored anti-mildew silicone.

[0072] Comparative Example 1

[0073] Comparative Example 1 is a commercially available long-lasting anti-mildew alcohol-based environmentally friendly glass sealant for kitchens and bathrooms, from the Black & Decker brand of the German Henkel Group.

[0074] Comparative Example 2

[0075] Comparative Example 2 is a commercially available GM alcohol-based sealant manufactured by Wacker Chemie AG.

[0076] Performance testing

[0077] Five samples were used for performance testing: the copper-colored anti-mildew silicone prepared in Examples 1, 2, and 3 of this invention, the commercially available long-lasting anti-mildew alcohol-based environmentally friendly glass sealant for kitchens and bathrooms in Comparative Example 1, and the commercially available GM alcohol-based sealant in Comparative Example 2. The performance testing methods are as follows:

[0078] 1. Determination of volatile organic compound (VOC) content: According to GB33372-2020 "Limits of volatile organic compounds in adhesives": Place an appropriate amount of adhesive in a drying oven at a constant temperature, and determine the total volatile content of the adhesive within a specified time.

[0079] 2. Copper-like color performance test: Place the copper sheet coated with copper-like anti-mildew silicone in a high temperature and high humidity environment (temperature 40℃, relative humidity 85%), observe the color change of the copper sheet surface regularly, and record the time when obvious color change (color difference change value △E≥2) occurs.

[0080] 3. Antifungal performance test: According to ASTM G21-15 "Standard test method for antifungal properties of synthetic polymer materials", the silica gel sample was placed on a culture medium containing a variety of common molds (such as Aspergillus niger, Aspergillus flavus, etc.) and cultured for 28 days at a temperature of 28°C and a relative humidity of 95%. The antifungal level was evaluated by observing the proportion of the sample surface area covered by mold growth. Level 0 means no mold growth and level 5 means the mold growth coverage area is greater than 75%.

[0081] 4. Noise reduction performance test: Using acoustic testing equipment, simulate the noise environment in actual use scenarios, place the silicone sample on the noise propagation path, measure the noise decibel value before and after passing through the silicone, and calculate the noise attenuation, with the unit being dB(A).

[0082] 5. Surface drying time: Refer to the provisions of GB / T 13477.3-2017 "Test methods for building sealing materials - Part 3: Method for determining the extrudability of sealing materials using standard instruments".

[0083] 6. Tensile strength test: According to GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber", the silicone is made into a standard dumbbell-shaped specimen and stretched at a speed of 500 mm / min on a universal testing machine to measure its tensile strength.

[0084] The performance test results are shown in Table 1:

[0085] Table 15 Performance Test Results of Samples

[0086]

[0087] As shown in Table 1, the copper-colored anti-mildew silicone prepared by this invention possesses excellent dual properties of copper-like color and anti-mildew. Furthermore, the alcohol-based formulation complies with the highest domestic VOC standards, demonstrating superior environmental performance. This copper-colored anti-mildew silicone can be effectively used in humid environments such as bathrooms and kitchens. In addition, the use of glass fiber powder and sound-absorbing powder as functional additives endows the silicone with sound-absorbing properties. Regarding color, the methyl hyperbranched polysiloxane, with its cage-like structure, can effectively disperse and fix the copper-colored paste, ensuring long-lasting protection of the copper color. The copper-colored anti-mildew silicone prepared by this invention has broad prospects in many fields, both indoors and outdoors.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical methods of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical methods of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical methods to deviate from the spirit and scope of the technical methods of the present invention.

Claims

1. A copper-like anti-mold silica gel, characterized in that, The imitation copper color mildew-proof silica gel comprises, in parts by weight, 54-60 parts of methyl hyperbranched polysiloxane, 10-17 parts of sound-damping toughening agent, 3-7 parts of copper color paste, 0.8-1.4 parts of fluorosilane coupling agent, 0.8-1.4 parts of long-acting mildew-proof agent, 8-11 parts of fumed silica, 6-8 parts of alcohol type coupling agent, 0.8-1.4 parts of alcohol type crosslinking agent, 0.6-2.8 parts of composite titanium compound, 0.3-1.4 parts of deep curing accelerator and 0.8-3.6 parts of silicone oil.

2. The anti-mildew silicone rubber with copper color according to claim 1, characterized in that, The sound-damping toughening agent is at least one of hollow glass microbeads and glass fiber powder.

3. The anti-mildew silicone rubber with copper color according to claim 1, characterized in that, The copper color paste is at least one of copper and gold powder pigment dispersion, copper phthalocyanine color paste and nano copper powder composite color paste.

4. The anti-mildew silicone rubber with copper color according to claim 1, characterized in that, The composite titanium compound is at least one of bis(acetylacetonato)diisopropyl titanate and organic bismuth catalyst.

5. The anti-mildew silicone rubber with copper color according to claim 1, characterized in that, The alcohol type coupling agent is at least one of methyl triethoxysilane, vinyl triethoxysilane, gamma-aminopropyl triethoxysilane and gamma-mercapto propyl trimethoxysilane; and the alcohol type crosslinking agent is at least one of gamma-chloropropyl triethoxysilane, methyl trimethoxysilane, phenyl trimethoxysilane, vinyl trimethoxysilane and tetraethyl orthosilicate.

6. The anti-mildew silicone rubber with copper color according to claim 1, characterized in that, The deep curing accelerator is at least one of dibutyltin dilaurate, stannous octoate, organic bismuth catalyst and tertiary amine compound.

7. The anti-mildew silicone rubber with copper color according to claim 1, characterized in that, The fluorosilane coupling agent is at least one of perfluorooctyl triethoxysilane and heptadecafluorodecyl trimethoxysilane; and the long-acting mildew-proof agent is silver-coated copper powder.

8. A method for preparing a copper-colored anti-mildew silica gel according to any one of claims 1-7, characterized in that, The method comprises the following steps: S1, according to the proportion by weight, 54-60 parts of methyl hyperbranched polysiloxane is stirred for 30-120 minutes, then 8-11 parts of fumed silica and 0.8-3.6 parts of silicone oil are added and stirred for 30-40 minutes to obtain a first mixture; S2, 10-17 parts of sound-damping toughening agent, 0.8-1.4 parts of fluorosilane coupling agent, 6-8 parts of alcohol type coupling agent and 0.6-2.8 parts of composite titanium compound are added into the first mixture, and stirred for 45-60 minutes to obtain a second mixture; S3, 0.8-1.4 parts of long-acting mildew-proof agent, 3-7 parts of copper color paste and 0.3-1.4 parts of deep curing accelerator are added into the second mixture, and stirred for 30-40 minutes under a vacuum degree of 0.09 MPa, then 0.8-1.4 parts of alcohol type crosslinking agent is added and stirred for 20-30 minutes under a vacuum degree of 0.09 MPa to obtain a finished product, namely imitation copper color mildew-proof silica gel.

9. The method of claim 8, wherein the copper-colored mold-preventing silica gel is prepared by adding 0.1-0.3 parts by weight of the copper-colored pigment to 100 parts by weight of the silica gel. The preparation method of the methyl hyperbranched polysiloxane comprises the following steps: (1) under a nitrogen atmosphere, tetra(dimethylsiloxy)silane is dissolved in anhydrous toluene, then an alkaline catalyst is added, the temperature is raised to 60-80 DEG C, and stirring is carried out for 30-60 minutes to generate siloxane potassium salt through neutralization reaction; the alkaline catalyst is potassium hydroxide; (2) under the condition of 80-100 DEG C, octamethylcyclotetrasiloxane monomer is added dropwise into the siloxane potassium salt, the temperature is raised to 120-150 DEG C, and ring-opening polymerization reaction is carried out for 2-6 hours to obtain a reaction liquid; (3) cooling the reaction solution to 60 DEG C, adding an acid terminator to terminate the reaction, and distilling under reduced pressure to obtain a crude product; the acid terminator is one of glacial acetic acid and an acid resin; (4) dissolving the crude product in an organic solvent, and purifying by silica gel column chromatography to obtain the methyl hyperbranched polysiloxane.

10. The method of claim 9, wherein the copper-colored mold-preventing silica gel is prepared by adding 0.1 to 0.3 parts by weight of the copper-colored pigment to 100 parts by weight of the silica gel, and then mixing the pigment with the silica gel. The mass ratio of the tetra(dimethylsiloxy)silane initiator to the octamethylcyclotetrasiloxane is 0.01-0.05:1; The mass ratio of the anhydrous toluene to the octamethylcyclotetrasiloxane is 0.5-1:1; The mass ratio of the basic catalyst to the octamethylcyclotetrasiloxane is 0.001-0.005:1.

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