Formula and preparation method of waterproof sealant

Abstract

The invention discloses a waterproof sealant formula and a preparation method thereof. The formula comprises the following raw materials in parts by mass: 100 parts of base material butyl rubber; 6-8 parts of a tackifier coumarone resin; 10 to 15 parts of filler nano silicon dioxide and 200 to 250 parts of talcum powder; 5-8 parts of a modifier; 5 to 7 parts of a plasticizer dibutyl phthalate; 1 to 3 parts of an anti-aging agent 4010NA; 0.5-1 part of a catalyst; 5-10 parts of an environment-friendly solvent ethyl acetate; 150 to 170 parts of polyisobutene; 20 to 30 parts of a softening agent; and 50 to 60 parts of tackifying resin C 530. The waterproof material has the advantages of excellent waterproof performance, excellent aging resistance and remarkable environmental protection, has good flexibility and cohesiveness, realizes optimized preparation process and cost control, and through reasonable raw material combination and proportioning, simplifies the preparation process, reduces the process difficulty and cost, and improves the production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of sealants, and in particular to a waterproof sealant formula and a preparation method. Background Art

[0002] Waterproof sealants play a vital role in many industrial fields such as construction, automobiles, electronics, aerospace, etc. Their main function is to fill and seal various gaps and holes to prevent the penetration and intrusion of moisture, gas, dust, chemicals, etc. At the same time, they can also play a role in buffering, shock absorption and bonding to a certain extent. They are of irreplaceable importance in ensuring the structural integrity of the product, extending its service life, and ensuring safety and reliability.

[0003] However, existing waterproof sealants have obvious deficiencies and problems in many aspects. On the one hand, in terms of waterproof performance, traditional waterproof sealants often cannot meet the increasingly high waterproof requirements due to the limitations of their own formula and structure, especially under long-term immersion in water, high water pressure or complex environments, and are prone to water seepage and leakage. For example, the filler in some sealants is not tightly combined with the base material. Under the long-term erosion of water molecules, microscopic channels may be formed, resulting in a decrease in sealing performance and failure to effectively prevent water penetration, thereby affecting the performance and life of the product using the sealant.

[0004] On the other hand, in terms of aging resistance, many existing sealants will age during long-term use due to the influence of external environmental factors such as ultraviolet radiation, temperature changes, oxygen and chemicals, which is manifested as a decline in the physical and chemical properties of the sealant. The hardness of the sealant may change, becoming brittle or softening, losing its original flexibility and elasticity, causing the bond between the sealant and the sealing interface to decrease, and ultimately leading to sealing failure. Aged sealants may soften and flow in high temperature environments, and may crack in low temperature environments, greatly affecting their sealing effect and reliability in different environments.

[0005] At the same time, the environmental performance of existing sealants also has major problems. The formulas of some sealants contain a large amount of substances that are harmful to human health and the environment. For example, certain solvents and additives will evaporate during use to produce volatile organic compounds (VOCs). These VOCs will not only pollute the air, but also pose a potential threat to the health of operators, and may also cause long-term pollution to the environment during disposal. In addition, some plasticizers and softeners may migrate and precipitate during use, causing pollution to the surrounding environment and objects in contact.

[0006] In addition, in terms of preparation technology, the preparation technology of some waterproof sealants is complicated, involving precise control of multiple steps and multiple conditions, resulting in low production efficiency and high cost. This not only limits the large-scale production of sealants, but is also not conducive to product quality control. In addition, the complex process may also increase product instability and performance inconsistency.

[0007] In terms of formula cost, some waterproof sealants use some expensive raw materials or special additives, which makes the cost of the product high, limits its use in some cost-sensitive application fields, and is not conducive to the widespread promotion and application of the product.

[0008] Therefore, in order to overcome the many problems of existing waterproof sealants in terms of waterproof performance, aging resistance, environmental protection, preparation process and cost, it is urgent to develop a new type of waterproof sealant, so that it can have good environmental protection while ensuring excellent waterproof and aging resistance, and reduce production costs by optimizing the preparation process to meet the market demand for high-performance, environmentally friendly and economical waterproof sealants. The present invention aims to provide an innovative waterproof sealant formula, using a new raw material combination and a reasonable ratio, with butyl rubber as the base material, combined with a variety of additives, including tackifiers, fillers, modifiers, plasticizers, antioxidants, catalysts, environmentally friendly solvents, polyisobutylene, softeners and tackifying resin C530, while improving the comprehensive performance of the sealant, it is also committed to improving its environmental protection and reducing the preparation cost, so as to solve the problems existing in the above-mentioned prior art and bring new solutions to the field of waterproof sealants. Summary of the invention

[0009] In view of the deficiencies in the background technology, the present invention provides a waterproof sealant formula and a preparation method.

[0010] The technical solution adopted by the present invention is: a waterproof sealant formula, comprising the following raw materials in parts by weight:

[0011] Base material: 100 parts of butyl rubber;

[0012] Tackifier: 6-8 parts of coumarone resin;

[0013] Filler: 10-15 parts of nano silicon dioxide, 200-250 parts of talc;

[0014] Modifier: 5-8 parts;

[0015] Plasticizer: 5-7 parts of dibutyl phthalate;

[0016] Anti-aging agent: 4010NA 1-3 parts;

[0017] Catalyst: 0.5-1 part;

[0018] Environmentally friendly solvent: 5-10 parts of ethyl acetate;

[0019] Polyisobutylene: 150-170 parts;

[0020] Softener: 20-30 parts;

[0021] Tackifying resin C530: 50-60 parts.

[0022] The above formula takes into account the synergistic effect of various raw materials and provides a comprehensive performance basis for the sealant.

[0023] Using butyl rubber as the base material gives the sealant good elasticity and flexibility, enabling it to adapt to different sealing scenarios and structural deformations, ensuring the fit and sealing effect of the sealant in various gaps and interfaces.

[0024] As a tackifier, coumarone resin can enhance the adhesion of sealants to the surfaces of different materials, improve the bonding properties of sealants, ensure that they can firmly adhere to the sealing interface during use, and prevent the sealant from peeling off from the surface of the sealed material.

[0025] Nano-silica and talc are used as fillers. The nano-effect of nano-silica and the filling characteristics of talc cooperate with each other. On the one hand, nano-silica can improve the microstructure of the sealant and enhance its density. On the other hand, talc can provide macroscopic filling and support, which together improve the mechanical strength and stability of the sealant, and at the same time help to improve the sealant's waterproof, compression and deformation resistance.

[0026] The limited dosage range of modifiers, plasticizers, antioxidants, catalysts, environmentally friendly solvents, polyisobutylene, softeners and tackifying resin C530 can balance the physical and chemical properties of the sealant through the interaction and synergistic effect between the components while ensuring the basic performance of the sealant, laying the foundation for subsequent preparation technology and the performance of the final product, so that the sealant has comprehensive advantages in terms of waterproofness, aging resistance, flexibility, processing performance, etc., meets the sealing needs under different use conditions, and takes into account cost and environmental factors.

[0027] Furthermore, the modifier is epoxy resin.

[0028] Using epoxy resin as a modifier can bring unique technical effects to sealants.

[0029] Furthermore, the catalyst is dibutyltin dilaurate.

[0030] Dibutyltin dilaurate can effectively promote various chemical reactions in sealants, especially in the reaction process involving active ingredients such as epoxy resin. It can reduce the reaction activation energy, speed up the reaction rate, make the sealant preparation process more efficient, and shorten the preparation time.

[0031] Furthermore, the softener is a mixture of soybean oil and tributyl citrate.

[0032] As a natural vegetable oil, soybean oil has the characteristics of wide source, low cost and biodegradability. It can not only improve the flexibility and plasticity of sealants, but also improve the processing performance of sealants to a certain extent, making them easier to shape and operate. As an environmentally friendly softener, tributyl citrate has low volatility and good compatibility. When used with soybean oil, it can make up for the shortcomings of soybean oil in certain properties, such as improving the stability of sealants during long-term use, reducing performance fluctuations caused by environmental factors, and enabling sealants to maintain good flexibility and plasticity under different temperatures and environmental conditions. At the same time, it reduces the potential harm of sealants to the environment and improves the environmental performance of the entire sealant.

[0033] Furthermore, the ratio of the soybean oil to tributyl citrate is 1:2.

[0034] Under this ratio, the stability and low volatility of tributyl citrate can be fully utilized, and combined with the natural characteristics of soybean oil, the hardness and temperature resistance of the sealant can be better controlled on the basis of ensuring the flexibility and plasticity of the sealant. Compared with other ratios, this ratio can make the sealant have better shape retention ability in high temperature environment, prevent softening and deformation, reduce the risk of embrittlement in low temperature environment, further improve the high and low temperature resistance of the sealant, and enable it to maintain good performance in a wider temperature range (such as -40℃ to 80℃ or even wider), adapt to the sealing needs in different seasons and climatic conditions, and improve the environmental adaptability of the sealant.

[0035] The present application also provides a preparation method, comprising the following steps:

[0036] S1, rubber compound mixing stage:

[0037] 1.1. Add butyl rubber into the rubber internal mixer, start the internal mixer, set the temperature to 80-90℃ and the speed to 30-50 rpm;

[0038] 1.2. When the butyl rubber begins to tumble evenly in the internal mixer, add soybean oil and continue stirring for 5-10 minutes to allow the soybean oil to fully penetrate into the butyl rubber;

[0039] 1.3. Add one third of the total amount of talcum powder and continue stirring for 10-15 minutes to ensure that the talcum powder is evenly dispersed in the mixture of butyl rubber and soybean oil to form a preliminary mixture;

[0040] 1.4. After mixing for about 20-30 minutes, a uniform butyl rubber masterbatch is prepared;

[0041] S2, rubber compound kneading stage:

[0042] 2.1. Take out the butyl rubber masterbatch material prepared above from the rubber internal mixer, inject it into the kneading machine, start the kneading machine, set the speed to 20-30 rpm, and control the temperature at 70-90°C;

[0043] 2.2. Add polyisobutylene and stir for 5-8 minutes to fully mix it with the masterbatch;

[0044] 2.3. Add coumarone resin and tackifying resin C530 in sequence, and stir for 8-12 minutes to allow the resin components to fully contact and blend with the masterbatch and polyisobutylene;

[0045] 2.4. Slowly add the remaining two-thirds of talcum powder into the kneader and continue stirring for 15-20 minutes to evenly disperse the talcum powder in the mixture to improve the filling performance and physical properties of the sealant; 2.5. Add nano-silicon dioxide and stir for 8-12 minutes to utilize the nano-effect of nano-silicon dioxide to enhance the performance of the sealant, such as improving its strength and improving interface performance;

[0046] 2.6. Add epoxy resin as a modifier and stir for 10-15 minutes to enhance the waterproof performance and overall performance of the sealant through chemical reaction or physical action with other ingredients;

[0047] 2.7. Add dibutyl phthalate as a plasticizer and stir for 5-8 minutes to improve the flexibility and plasticity of the sealant;

[0048] 2.8. Add antioxidant 4010NA and stir for 5-8 minutes to enhance the anti-aging performance of the sealant;

[0049] 2.9. Add tributyl citrate and stir for 8-12 minutes to ensure that it is evenly dispersed in the system and synergistically softens with soybean oil to improve the flexibility and plasticity of the sealant; add catalyst dibutyltin dilaurate and environmentally friendly solvent ethyl acetate and stir for 10-15 minutes to fully mix the entire system and promote chemical reactions or physical fusions between various components, while ensuring that the system has appropriate fluidity and processability to obtain the rubber compound;

[0050] S 3. Filtration and debinding stage:

[0051] 3.1. After uniform kneading, use a suitable filter to filter the rubber material to remove possible large particles or impurities to obtain the final sealant.

[0052] Further: the filter mesh number in S3 is 200-300 mesh.

[0053] The beneficial effects of the present invention are:

[0054] 1. Excellent waterproof performance: The present invention adds nano-silica and a carefully selected filler combination to the formula. The nano-size effect of nano-silica enables it to be filled into the microscopic pores in the sealant system, and synergizes with other fillers (such as talcum powder) to form a more dense filling structure, significantly reducing the microscopic pores and channels in the sealant, and effectively blocking the penetration of water molecules. Through the optimization of this microstructure, the sealant can maintain excellent sealing performance under long-term immersion in water or high water pressure environments, providing a more reliable waterproof barrier for sealing applications.

[0055] 2. Excellent anti-aging performance: The antioxidant 4010NA introduced in the formula can effectively inhibit the aging phenomenon of the sealant caused by ultraviolet radiation, temperature changes, oxygen and chemical substances during long-term use. The antioxidant captures the free radicals generated by the sealant under the action of the environment, delays the breakage, cross-linking and other chemical changes of the sealant molecular chain, and ensures that the sealant maintains stable physical and chemical properties during long-term use. This allows the sealant of the present invention to maintain good flexibility, elasticity and bonding properties after long-term outdoor exposure or use in harsh environmental conditions, effectively avoiding sealing failure caused by aging, and significantly extending the service life and reliability of the sealant.

[0056] 3. Significant environmental advantages: The environmentally friendly solvent ethyl acetate is used as the solvent, which has low toxicity and relatively low volatility. Compared with traditional organic solvents, it greatly reduces the emission of volatile organic compounds (VOCs) during the preparation and use of sealants, reduces pollution to the environment and potential harm to the health of operators. At the same time, under the premise of ensuring the performance of the sealant, the use of substances that are harmful to the environment and human body is avoided as much as possible, so that it has good environmental performance throughout its life cycle, meets the needs of modern society for environmentally friendly products, and provides a feasible option for green manufacturing and environmentally friendly applications.

[0057] 3. Good flexibility and adhesion: The base material butyl rubber has good flexibility and elasticity. With the right amount of tackifier (coumarone resin), softener and plasticizer (dibutyl phthalate), the sealant has excellent flexibility, can adapt to the shape and deformation of different sealing interfaces, and can fit closely with the surface of various materials during the sealing process to ensure good bonding effect. This flexibility and adhesion ensure that the sealant can form a firm seal between different materials and gaps of different shapes, prevent sealing failure caused by structural deformation or vibration, and enhance the sealing performance of the sealant in various complex structures and dynamic environments.

[0058] 4. Optimized preparation process and cost control: The formula designed by the present invention simplifies the preparation process through reasonable raw material combination and ratio. In the preparation process, various raw materials have good compatibility, and can achieve uniform mixing and performance optimization under relatively simple rubber compound mixing, kneading and filtering and degumming processes, reducing the process difficulty and operation complexity in the production process and improving production efficiency. At the same time, the selected raw materials are widely available and the cost is reasonable. The usage of some raw materials has been optimized and adjusted, which reduces the cost of raw materials without affecting the performance.

[0059] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below. DETAILED DESCRIPTION

[0060] The present invention will be further described below with reference to specific embodiments, but the protection scope of the present invention is not limited thereto.

[0061] Embodiment 1:

[0062] A waterproof sealant formula includes the following raw materials in parts by weight:

[0063] Base material: 100 parts of butyl rubber;

[0064] Tackifier: 6 parts of coumarone resin;

[0065] Filler: 10 parts of nano silicon dioxide, 200 parts of talc;

[0066] Modifier: 5 parts;

[0067] Plasticizer: 5 parts of dibutyl phthalate;

[0068] Anti-aging agent: 4010NA 1 part;

[0069] Catalyst: 0.5 parts;

[0070] Environmentally friendly solvent: 5 parts of ethyl acetate;

[0071] Polyisobutylene: 150 parts;

[0072] Softener: 20 parts;

[0073] Tackifying resin C530: 50 parts.

[0074] Specifically, the modifier is epoxy resin.

[0075] Specifically, the catalyst is dibutyltin dilaurate.

[0076] Specifically, the softener is a mixture of soybean oil and tributyl citrate.

[0077] Specifically, the ratio of soybean oil to tributyl citrate is 1:2.

[0078] The present application also provides a preparation method, comprising the following steps:

[0079] S1, rubber compound mixing stage:

[0080] 1.1. Add butyl rubber into the rubber internal mixer, start the internal mixer, set the temperature to 80°C and the speed to 30 rpm;

[0081] 1.2. When the butyl rubber begins to tumble evenly in the internal mixer, add soybean oil and continue stirring for 5 minutes to allow the soybean oil to fully penetrate into the butyl rubber;

[0082] 1.3. Add one third of the total amount of talcum powder and continue stirring for 10 minutes to ensure that the talcum powder is evenly dispersed in the mixture of butyl rubber and soybean oil to form a preliminary mixture;

[0083] 1.4. After mixing for about 20 minutes, a uniform butyl rubber masterbatch is prepared;

[0084] S2, rubber compound kneading stage:

[0085] 2.1. Take out the prepared butyl rubber masterbatch material from the rubber internal mixer, inject it into the kneading machine, start the kneading machine, set the speed to 20 rpm, and control the temperature at 70°C;

[0086] 2.2. Add polyisobutylene and stir for 5 minutes to fully mix it with the masterbatch;

[0087] 2.3. Add coumarone resin and tackifying resin C530 in sequence and stir for 8 minutes to allow the resin components to fully contact and blend with the masterbatch and polyisobutylene;

[0088] 2.4. Slowly add the remaining two-thirds of talcum powder into the kneader and continue stirring for 15 minutes to evenly disperse the talcum powder in the mixture to improve the filling performance and physical properties of the sealant; 2.5. Add nano-silicon dioxide and stir for 8 minutes to utilize the nano-effect of nano-silicon dioxide to enhance the performance of the sealant, such as improving its strength and improving interface performance;

[0089] 2.6. Add epoxy resin as a modifier and stir for 10 minutes to enhance the waterproof performance and overall performance of the sealant through chemical reaction or physical action with other ingredients;

[0090] 2.7. Add dibutyl phthalate as a plasticizer and stir for 5 minutes to improve the flexibility and plasticity of the sealant;

[0091] 2.8. Add antioxidant 4010NA and stir for 5 minutes to enhance the anti-aging performance of the sealant;

[0092] 2.9. Add tributyl citrate and stir for 8 minutes to ensure that it is evenly dispersed in the system and synergistically softens with soybean oil to improve the flexibility and plasticity of the sealant; add catalyst dibutyltin dilaurate and environmentally friendly solvent ethyl acetate and stir for 10 minutes to fully mix the entire system and promote chemical reactions or physical fusions between various components, while ensuring that the system has appropriate fluidity and processability to obtain the rubber compound;

[0093] S 3. Filtration and debinding stage:

[0094] 3.1. After uniform kneading, use a suitable filter to filter the rubber material to remove possible large particles or impurities to obtain the final sealant.

[0095] Specifically, the filter mesh number in S3 is 200 meshes.

[0096] Embodiment 2:

[0097] A waterproof sealant formula includes the following raw materials in parts by weight:

[0098] Base material: 100 parts of butyl rubber;

[0099] Tackifier: 7 parts of coumarone resin;

[0100] Filler: 12 parts of nano silicon dioxide, 230 parts of talc;

[0101] Modifier: 6 parts;

[0102] Plasticizer: 6 parts of dibutyl phthalate;

[0103] Anti-aging agent: 4010NA 5 parts;

[0104] Catalyst: 0.8 parts;

[0105] Environmentally friendly solvent: 7 parts of ethyl acetate;

[0106] Polyisobutylene: 160 parts;

[0107] Softener: 25 parts;

[0108] Tackifying resin C530: 55 parts.

[0109] Specifically, the modifier is epoxy resin.

[0110] Specifically, the catalyst is dibutyltin dilaurate.

[0111] Specifically, the softener is a mixture of soybean oil and tributyl citrate.

[0112] Specifically, the ratio of soybean oil to tributyl citrate is 1:2.

[0113] The present application also provides a preparation method, comprising the following steps:

[0114] S1, rubber compound mixing stage:

[0115] 1.1. Add butyl rubber into the rubber internal mixer, start the internal mixer, set the temperature to 80-90℃ and the speed to 45 rpm;

[0116] 1.2. When the butyl rubber begins to tumble evenly in the internal mixer, add soybean oil and continue stirring for 5-10 minutes to allow the soybean oil to fully penetrate into the butyl rubber;

[0117] 1.3. Add one third of the total amount of talcum powder and continue stirring for 13 minutes to ensure that the talcum powder is evenly dispersed in the mixture of butyl rubber and soybean oil to form a preliminary mixture;

[0118] 1.4. After mixing for about 25 minutes, a uniform butyl rubber masterbatch is prepared;

[0119] S2, rubber compound kneading stage:

[0120] 2.1. Take the butyl rubber masterbatch material prepared above out of the rubber internal mixer, inject it into the kneading machine, start the kneading machine, set the speed to 25 rpm, and control the temperature at 80°C;

[0121] 2.2. Add polyisobutylene and stir for 7 minutes to fully mix it with the masterbatch;

[0122] 2.3. Add coumarone resin and tackifying resin C530 in sequence and stir for 10 minutes to allow the resin components to fully contact and blend with the masterbatch and polyisobutylene;

[0123] 2.4. Slowly add the remaining two-thirds of talcum powder into the kneader and continue stirring for 17 minutes to evenly disperse the talcum powder in the mixture to improve the filling performance and physical properties of the sealant; 2.5. Add nano-silicon dioxide and stir for 10 minutes to utilize the nano-effect of nano-silicon dioxide to enhance the performance of the sealant, such as improving its strength and improving interface performance;

[0124] 2.6. Add epoxy resin as a modifier and stir for 12 minutes to enhance the waterproof performance and overall performance of the sealant through chemical reaction or physical action with other ingredients;

[0125] 2.7. Add dibutyl phthalate as a plasticizer and stir for 7 minutes to improve the flexibility and plasticity of the sealant;

[0126] 2.8. Add antioxidant 4010NA and stir for 7 minutes to enhance the anti-aging performance of the sealant;

[0127] 2.9. Add tributyl citrate and stir for 10 minutes to ensure that it is evenly dispersed in the system, and synergistically play a softening role with soybean oil to improve the flexibility and plasticity of the sealant; add catalyst dibutyltin dilaurate and environmentally friendly solvent ethyl acetate, stir for 13 minutes to fully mix the whole system, promote chemical reaction or physical fusion between various components, and ensure that the system has appropriate fluidity and processability to obtain the rubber compound;

[0128] S 3. Filtration and debinding stage:

[0129] 3.1. After uniform kneading, use a suitable filter to filter the rubber material to remove possible large particles or impurities to obtain the final sealant.

[0130] Specifically, the filter mesh number in S3 is 250 mesh.

[0131] Embodiment 3:

[0132] A waterproof sealant formula includes the following raw materials in parts by weight:

[0133] Base material: 100 parts of butyl rubber;

[0134] Tackifier: 8 parts of coumarone resin;

[0135] Filler: 15 parts of nano silicon dioxide, 250 parts of talc;

[0136] Modifier: 8 parts;

[0137] Plasticizer: 7 parts of dibutyl phthalate;

[0138] Anti-aging agent: 4010NA 3 parts;

[0139] Catalyst: 1 part;

[0140] Environmentally friendly solvent: 10 parts of ethyl acetate;

[0141] Polyisobutylene: 170 parts;

[0142] Softener: 30 parts;

[0143] Tackifying resin C530: 60 parts.

[0144] Specifically, the modifier is epoxy resin.

[0145] Specifically, the catalyst is dibutyltin dilaurate.

[0146] Specifically, the softener is a mixture of soybean oil and tributyl citrate.

[0147] Specifically, the ratio of soybean oil to tributyl citrate is 1:2.

[0148] The present application also provides a preparation method, comprising the following steps:

[0149] S1, rubber compound mixing stage:

[0150] 1.1. Add butyl rubber into the rubber internal mixer, start the internal mixer, set the temperature to 80-90℃ and the speed to 50 rpm;

[0151] 1.2. When the butyl rubber begins to tumble evenly in the internal mixer, add soybean oil and continue stirring for 10 minutes to allow the soybean oil to fully penetrate into the butyl rubber;

[0152] 1.3. Add one third of the total amount of talcum powder and continue stirring for 15 minutes to ensure that the talcum powder is evenly dispersed in the mixture of butyl rubber and soybean oil to form a preliminary mixture;

[0153] 1.4. After mixing for about 30 minutes, a uniform butyl rubber masterbatch is prepared;

[0154] S2, rubber compound kneading stage:

[0155] 2.1. Take out the butyl rubber masterbatch material prepared above from the rubber internal mixer, inject it into the kneading machine, start the kneading machine, set the speed to 30 rpm, and control the temperature at 90°C;

[0156] 2.2. Add polyisobutylene and stir for 8 minutes to fully mix it with the masterbatch;

[0157] 2.3. Add coumarone resin and tackifying resin C530 in sequence and stir for 12 minutes to allow the resin components to fully contact and blend with the masterbatch and polyisobutylene;

[0158] 2.4. Slowly add the remaining two-thirds of talcum powder into the kneader and continue stirring for 20 minutes to evenly disperse the talcum powder in the mixture to improve the filling performance and physical properties of the sealant; 2.5. Add nano-silicon dioxide and stir for 12 minutes to utilize the nano-effect of nano-silicon dioxide to enhance the performance of the sealant, such as improving its strength and improving interface performance;

[0159] 2.6. Add epoxy resin as a modifier and stir for 15 minutes to enhance the waterproof performance and overall performance of the sealant through chemical reaction or physical action with other ingredients;

[0160] 2.7. Add dibutyl phthalate as a plasticizer and stir for 8 minutes to improve the flexibility and plasticity of the sealant;

[0161] 2.8. Add antioxidant 4010NA and stir for 8 minutes to enhance the anti-aging performance of the sealant;

[0162] 2.9. Add tributyl citrate and stir for 12 minutes to ensure that it is evenly dispersed in the system and synergistically softens with soybean oil to improve the flexibility and plasticity of the sealant; add catalyst dibutyltin dilaurate and environmentally friendly solvent ethyl acetate and stir for 15 minutes to fully mix the entire system and promote chemical reactions or physical fusions between various components, while ensuring that the system has appropriate fluidity and processability to obtain the rubber compound;

[0163] S 3. Filtration and debinding stage:

[0164] 3.1. After uniform kneading, use a suitable filter to filter the rubber material to remove possible large particles or impurities to obtain the final sealant.

[0165] Specifically: the filter mesh number in S3 is 300 meshes.

[0166] Comparative Example 1:

[0167] Comparative example waterproof sealant formula and preparation method:

[0168] Formula (by mass):

[0169] Base material: 100 parts of butyl rubber;

[0170] Tackifier: rosin resin 5 parts;

[0171] Filler: 20 parts of ordinary silicon dioxide, 300 parts of calcium carbonate;

[0172] Modifier: None;

[0173] Plasticizer: 8 parts of dioctyl phthalate;

[0174] Anti-aging agent: 2 parts of antioxidant RD;

[0175] Catalyst: 0.8 parts of stannous octoate;

[0176] Solvent: 15 parts of toluene;

[0177] Polyisobutylene: 180 parts;

[0178] Softener: 35 parts of mineral oil;

[0179] Preparation method:

[0180] First, put the butyl rubber into a common open mill and mix it simply at room temperature, then add mineral oil and continue stirring for about 20 minutes to achieve preliminary mixing.

[0181] Next, calcium carbonate and a portion of ordinary silicon dioxide (about 100 parts) are added and stirred for about 30 minutes to disperse the filler in the mixture of rubber and softener. However, it is difficult to ensure uniform dispersion and agglomeration is likely to occur.

[0182] The above mixture was transferred to a reactor, heated to 100°C, rosin resin, polyisobutylene and dioctyl phthalate were added, and stirred for about 40 minutes. At this time, due to the high temperature and insufficient stirring, some raw materials may have local uneven reaction.

[0183] Antioxidant RD and stannous octoate were added and stirring was continued for about 20 minutes. No special control measures were used during the reaction, resulting in poor performance consistency of the final product.

[0184] Finally, add the remaining ordinary silica and toluene, stir for about 30 minutes and use directly without filtering or only filter through a simple filter, which cannot effectively remove large particles of impurities.

[0185] The following is a table containing experimental data, comparing the waterproof sealant of the present application with the sealant of the comparative example to reflect the superiority of the present application:

[0186]

[0187]

[0188] Test method description:

[0189] Water immersion test: In accordance with the national standard GB / T 1690-2010 (please fill in the specific standard number actually adopted), immerse the test sample coated with sealant in water, measure the water permeability and peel strength after the specified time, and observe whether there is water seepage on the surface of the sealant.

[0190] Flexibility test: Referring to relevant industry standards, the sealant is made into a thin sheet of specified thickness, and a bending test is performed on a specified mandrel to observe whether cracks appear and measure the bending modulus.

[0191] Compression rebound test: Use professional material testing equipment to compress the sealant and measure its rebound performance, and calculate the elastic recovery rate.

[0192] Bond strength test: According to standard test methods (such as GB / T 7124-2008), the sealant is bonded to different materials, the bond strength is measured by tensile test, and cyclic tests are performed under different environmental conditions to observe the changes in bond strength.

[0193] Accelerated aging test: simulates various adverse factors in the actual use environment, such as different temperatures, humidity, ultraviolet radiation, etc., and subjects the sealant to long-term accelerated aging treatment to evaluate the changes in its performance indicators, so as to infer the service life of the sealant.

[0194] Through the above experimental data, it can be clearly seen that the waterproof sealant of the present application is superior to the sealant of the comparative example in key performance indicators such as waterproof ability, flexibility, elasticity, bonding performance and service life, reflecting the superiority of the present application in sealant performance.

[0195] Technical personnel should note that: Although the present invention has been described according to the above specific implementation methods, the concept of the present invention is not limited to this invention, and any modification using the concept of the present invention will be included in the scope of protection of this patent right.

Claims

1. A waterproof sealant formula, characterized in that: The invention comprises the following raw materials in parts by weight: Base material: 100 parts of butyl rubber; Tackifier: 6-8 parts of coumarone resin; Filler: 10-15 parts of nano silicon dioxide, 200-250 parts of talc; Modifier: 5-8 parts; Plasticizer: 5-7 parts of dibutyl phthalate; Anti-aging agent: 4010NA 1-3 parts; Catalyst: 0.5-1 part; Environmentally friendly solvent: 5-10 parts of ethyl acetate; Polyisobutylene: 150-170 parts; Softener: 20-30 parts; Tackifying resin C530: 50-60 parts.

2. A waterproof sealant formulation according to claim 1, characterized in that: The modifier is epoxy resin.

3. A waterproof sealant formulation according to claim 1, characterized in that: The catalyst is dibutyltin dilaurate.

4. A waterproof sealant formulation according to claim 1, characterized in that: The softener is a mixture of soybean oil and tributyl citrate.

5. A waterproof sealant formulation according to claim 4, characterized in that: The ratio of the soybean oil to tributyl citrate is 1:

2.

6. A preparation method: characterized in that The following steps are involved: S1, rubber compound mixing stage: 1.

1. Add butyl rubber into the rubber internal mixer, start the internal mixer, set the temperature to 80-90℃ and the speed to 30-50 rpm; 1.

2. When the butyl rubber begins to tumble evenly in the internal mixer, add soybean oil and continue stirring for 5-10 minutes to allow the soybean oil to fully penetrate into the butyl rubber; 1.

3. Add one third of the total amount of talcum powder and continue stirring for 10-15 minutes to ensure that the talcum powder is evenly dispersed in the mixture of butyl rubber and soybean oil to form a preliminary mixture; 1.

4. After mixing for about 20-30 minutes, a uniform butyl rubber masterbatch is prepared; S2, rubber compound kneading stage: 2.

1. Take out the butyl rubber masterbatch material prepared above from the rubber internal mixer, inject it into the kneading machine, start the kneading machine, set the speed to 20-30 rpm, and control the temperature at 70-90°C; 2.

2. Add polyisobutylene and stir for 5-8 minutes to fully mix it with the masterbatch; 2.

3. Add coumarone resin and tackifying resin C530 in sequence, and stir for 8-12 minutes to allow the resin components to fully contact and blend with the masterbatch and polyisobutylene; 2.

4. Slowly add the remaining two-thirds of talcum powder into the kneader and continue stirring for 15-20 minutes to evenly disperse the talcum powder in the mixture to improve the filling performance and physical properties of the sealant; 2.

5. Add nano-silicon dioxide and stir for 8-12 minutes to enhance the performance of the sealant by using the nano-effect of nano-silicon dioxide, such as increasing its strength and improving interface performance; 2.

6. Add epoxy resin as a modifier and stir for 10-15 minutes to enhance the waterproof performance and overall performance of the sealant through chemical reaction or physical action with other ingredients; 2.

7. Add dibutyl phthalate as a plasticizer and stir for 5-8 minutes to improve the flexibility and plasticity of the sealant; 2.

8. Add antioxidant 4010NA and stir for 5-8 minutes to enhance the anti-aging performance of the sealant; 2.

9. Add tributyl citrate and stir for 8-12 minutes to ensure that it is evenly dispersed in the system and synergistically softens with soybean oil to improve the flexibility and plasticity of the sealant; add catalyst dibutyltin dilaurate and environmentally friendly solvent ethyl acetate and stir for 10-15 minutes to fully mix the entire system and promote chemical reactions or physical fusions between various components, while ensuring that the system has appropriate fluidity and processability to obtain the rubber compound; S 3. Filtration and debinding stage: 3.

1. After uniform kneading, use a suitable filter to filter the rubber material to remove possible large particles or impurities to obtain the final sealant.

7. A preparation method according to claim 6, characterized in that: The filter mesh number in S3 is 200-300 mesh.

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