Rubber soft mold material for producing large-scale adhesive tape product and preparation method of rubber soft mold material

Abstract

The invention relates to a rubber soft mold material for producing a large adhesive tape product and a preparation method thereof, belongs to the field of rubber, and solves the problems of poor mechanical property, poor radiation resistance, insufficient damping performance effect and poor process of silicone rubber by using phenylene silicone rubber and acrylate rubber (ACM) at the same time. After blending, the processing technology of the rubber material is greatly improved, the mechanical property of the vulcanized rubber material is improved, the use temperature range of a product is increased (-10 to 175 DEG C), the defects of physical property and inconvenient processing of the rubber material after single-component rubber is used are improved, and no adverse effect is caused on the resilience, compression deformation and aging resistance of the rubber material.

Description

Technical Field

[0001] The invention belongs to the technical field of rubber mold material products, and in particular relates to a rubber soft mold material for producing large-scale rubber tape products and a preparation method thereof. Background Art

[0002] High molecular weight polymers are composed of small and simple chemical units (chain links) to form long chain molecules. The molecules are connected to each other by physical bonds to form a three-dimensional molecular network structure. Relative motion occurs easily between molecules, and the chemical bonds between molecules can also rotate freely. Therefore, when subjected to stress, the twisted molecular chains will produce deformations such as stretching and bending; on the other hand, relative slip and torsion will also occur between molecules. After the alternating stress is removed, the deformed molecular chains tend to recover and release the work done by the external force. This is the elasticity of viscoelastic materials; but the slip and torsion between molecular chains cannot be completely restored and even the cross-linking bonds may break, resulting in a decrease in material performance and failure of the product.

[0003] At present, large-scale tapes, such as rubber dams, rubber raincoats, tarpaulins and other products, cannot be infinitely extended in width due to the limitation of internal skeleton weaving production equipment, and can only be constructed by using molds for weft splicing and vulcanization. When the rubber mold is used to reinforce and vulcanize the tape and splice the vulcanized tape, the material is subjected to alternating stress within a certain temperature range. Due to its unique viscoelastic properties, it exhibits deformation changes when in direct contact with an object, and can also apply stress like a rigid mold, thereby achieving the purpose of serving as a mold for vulcanizing tape products. As a result, the rubber soft mold plays an irreplaceable role in the splicing and vulcanization process of large-scale tape products. However, long-term high-temperature and high-pressure operations accelerate the aging of rubber soft molds. The aging performance of rubber soft molds made of different main rubber materials is also different. For example, after aging, natural rubber molds become soft, sticky, and have reduced strength, and cannot provide appropriate deformation and pressure; while aging of neoprene soft molds becomes hard and brittle. If the soft mold is not replaced in time, it will no longer be able to provide the designed mold deformation, and cracks will be printed on the tape products, seriously affecting the product appearance quality and bonding strength.

[0004] The main defects of using a single rubber material as the main material are as follows: (1) Using a single silicone rubber material. Although the rubber has excellent high and low temperature resistance and aging resistance, it has low strength and poor tearing and impact resistance. Although it has good heat aging resistance, the components are easily damaged, the replacement frequency is increased, and the cost of use is high; (2) The use of acrylic rubber can improve the strength of soft mold materials and improve oil resistance, but it hardens and loses its elastic modulus at low temperatures, and the rubber molecules can hardly move. Therefore, it cannot convert mechanical pressure into surface pressure at the joint of the product. The compression permanent deformation performance is poor, and the molding process of acrylic rubber into products is poor.

[0005] How to improve the service accuracy and service life of rubber soft molds and to a certain extent eliminate the accelerated aging failure caused by thermal aging and high-pressure working conditions has become an urgent problem to be solved by factory engineering and technical personnel.

[0006] Among general-purpose rubbers, silicone rubber's strength and elongation aren't the best, being average. However, due to the high flexibility of its molecular backbone, its elasticity can be maintained without the addition of plasticizers. It also exhibits excellent resistance to high and low temperatures, as well as aging. Due to the varying types and contents of side groups during the synthesis process, silicone rubber comes in a wide variety of grades, including vinyl, phenyl, and epoxy-modified. This results in a wide distribution of glass transition temperatures, a key reason for its selection as a soft mold material. Blending is a method for creating high-performance composite materials for rubber products. Combining two or more rubbers can improve the product's modulus, hardness, fatigue resistance, and media resistance. Because silicone rubber's mechanical strength is relatively low, it needs to be combined with a rubber with better mechanical properties to achieve a cost-effective material with excellent aging resistance and a long lifespan. We selected acrylic rubber with excellent mechanical properties, aging resistance, and, under certain conditions, high-temperature resistance. We mixed the two in a specific ratio to form an IPN (interpenetrating polymer network) structure (an IPN is a blend of two or more polymers whose molecular chains interpenetrate each other, with at least one polymer chain chemically cross-linked). After performance testing and analysis, we developed an ideal rubber composite material. However, due to the complex mixing and molding processes involved in a single silicone rubber or acrylic rubber formulation, its performance could not meet actual operating requirements. Summary of the Invention

[0007] In response to the defects of the existing technology, the purpose of the present invention is to provide a rubber soft mold material and preparation method for the production of large-scale adhesive tape products, which can meet the requirements of excellent heat and pressure transfer effects under working conditions within the range of -10°C to 185°C. Its characteristics are low brittle temperature, wide operating temperature range, and can be used for both cold pressing and hot vulcanization, eliminating the need for mold change time, achieving multi-purpose use of one machine, low compression permanent deformation, and excellent aging resistance performance indicators.

[0008] In order to achieve the purpose of the present invention, the following technical solutions are provided: A rubber soft mold material for the production of large-scale rubberized cloth products, characterized in that the mass parts of the components are as follows: based on 100 parts of rubber, phenylene silicone rubber, 50-80 parts; acrylic ester rubber ACM, 20-50 parts; barium stearate, 0.3-1.0 parts; zinc stearate, 3.0-5.0 parts; stearic acid, 1.0-1.5 parts; antioxidant MB, 1.5-2.0 parts; accelerator ethylenediamine, 1.5-2.0 parts; iron red, 3.0-4.0 parts; talc, 15.0-20.0 parts; graphite, 1.0-2.0 parts; plasticizer DBP, 5.0-8.0 parts; high-activity MgO, 1.0-1.5 parts; carbon black N330, 8.0-12.0 parts; white carbon black 180, 25.0-30.0 parts; silane coupling agent KH-550, 2.5-3.0 parts; scorch retarder CTP, 0.3-0.8 parts; cross-linking agent HVA-2, 2.5-3.0 parts; sulfur, 0.2-0.3 parts; dimethicone 25, 0.3-0.4 parts; odorless DCP, 0.5-1.0 parts.

[0009] The iron red is ferric oxide; the white carbon black is silicon dioxide 180; the silane coupling agent KH-550 is 3-aminopropyltriethoxysilane; the talc is Mg3〔Si4O 10 〕(OH)2 hydrous magnesium silicate; carbon black N330 is high wear-resistant furnace black (HAF); odorless DCP is bis(1-methyl-1-phenylethyl) diisopropyl benzene peroxide; bis-25 is 2,5-dimethyl-2,5-bis(tert-butyl peroxide)hexane; ethylenediamine is 1,2-diaminoethane; antioxidant MB is 2-mercaptobenzimidazole; plasticizer DBP is dibutyl phthalate; high-activity MgO is high-activity magnesium oxide RA-150; scorch retarder CTP is N-cyclohexylthiophthalimide, and HVA-2 is N,N'-m-phenylene bismaleimide.

[0010] A method for preparing a rubber soft mold material for producing large-scale rubberized cloth products, characterized in that it comprises the following steps: Step 1: Prepare the ingredients according to the above recipe; Step 2: Prepare process A rubber compound: add iron oxide red, 70% white carbon black 180, silane coupling agent KH-550, double 25, and odorless DCP to phenylene silicone rubber in the formula ratio, put the above ingredients into an open mill and mix for 20min~30min. The open mill roller temperature is 40℃~55℃. After the compounding agent is evenly dispersed in the rubber, remove the sheet and set aside. Label it as process A rubber compound; Step 3: Preparation process B rubber: Use internal mixer for pre-mixing, add acrylic rubber ACM, lower the top bolt, mix for 90 seconds ± 1 second; raise the top bolt, add stearic acid, barium stearate, zinc stearate, antioxidant MB, high-activity magnesium oxide MgO, anti-scorch agent CTP, HVA-2, lower the top bolt, pressurize and mix for 60 seconds ± 1 second; raise the top bolt, add ethylenediamine, talcum powder, graphite powder, carbon black N330, 30% white carbon black 180 , plasticizer DBP, lower the top bolt, pressurize and mix for 90sec±1sec, lift the top bolt, sweep the chamber, continue pressurizing for 10sec±1sec, lift the top bolt, discharge the glue, the discharge temperature is ≤110℃, use the open mill to cut into 5mm~8mm thick film, stop for 8 hours, then add sulfur on the open mill and mix for 7min~12min, the open mill roller temperature is 40℃~55℃, mix evenly, and cut into 5mm~8mm thick film, marked as process B rubber; Step 4: Prepare a compounded silicone rubber mixture by combining the process B rubber compound and the process A rubber compound according to a conventional silicone rubber method, including: Ingredients: 1 part of process B rubber, 1.6 parts of process A rubber; Roller wrapping: The roll temperature of the mixing mill is 40℃~55℃, and the rubber compound in process A is evenly wrapped around the roll; Adding and mixing: After the process A rubber material is evenly coated on the roller, add the process B rubber material and mix for 20min~30min until the two components are evenly mixed; Sheeting: Use a three-roll calender at 40℃~55℃ to calender and extrude the film; Test: Physical and mechanical properties of vulcanized rubber. Sample preparation: First stage vulcanization at 170℃×20min, second stage vulcanization at hot air at 150℃×2h + 180℃×8h, a rubber soft mold material for the production of large-scale tape products with aging resistance, high strength and long life is obtained.

[0011] The advantages of the present invention are: By using separately pre-mixed phenylene silicone rubber and acrylate rubber and introducing the acrylate rubber to form a cross-linked interpenetrating network structure, properties such as UV resistance, oil and solvent resistance, temperature resistance, acid and alkali resistance, water resistance, heat aging resistance, and wear resistance are comprehensively improved. Pre-mixing improves processing technology, stable performance, enhanced molecular arrangement and cross-linking structure density, and increased cross-linking bond energy. Compared with single-component ethyl silicone rubber, it has excellent mechanical properties and a wider operating temperature range. 2. Adding zinc stearate and barium stearate to pre-plasticized acrylic rubber effectively absorbs low-volatile components in the acrylic rubber, preventing many low-volatile components generated at high temperatures from volatilizing. This also improves the compression set resistance and high and low temperature resistance of the blended rubber of ethyl silicone rubber and acrylic rubber. It is also equivalent to adding an internal release agent, reducing the risk of tearing, chipping, and falling off during vulcanization of the rubber mix. 3. The silicone rubber curing agent Bis-25 is used in combination with DCP to increase the vulcanization speed and cross-linking density. In the staged mixing step, the acrylate is used as the B component in the mixing system. The scorch retarder CTP is added to prevent the rubber from premature cross-linking and scorching during the mixing process, thereby improving the safety of the rubber compound during molding and the stability of the process operation. 4. The added ethylenediamine is alkaline and can neutralize the acidity of silica during the vulcanization process. At the same time, it has self-activation in the rubber vulcanization system, accelerates the high-temperature secondary vulcanization speed, improves the vulcanization processing performance, and can also play a certain role in enhancing the corrosion resistance of the rubber compound; 5. The introduction of graphite particles, because after adding graphite, the friction loss at the interface with the matrix and the deformation of the graphite particles themselves are beneficial to improving the strength performance of the material, therefore, the compression plastic deformation of the formula material is enhanced and the impact resistance of the vulcanized rubber is improved; 6. The addition of the cross-linking agent HVA-2 component plays multiple roles. It can be used as an auxiliary vulcanizing agent to reduce the amount of peroxide vulcanizing agent, and it also has a very significant effect on reducing the compression permanent deformation of vulcanized rubber products. It can also play an anti-scorching role in the processing process and prevent the high-temperature vulcanized rubber from returning to its original state during the use of the soft mold product.

[0012] 7. One machine can be used for multiple purposes. It can be used as a mold for tape reinforcement and vulcanization, a soft mold for tape splicing, and a mold for repairing defects in tape products (such as bubbles, bulging and delamination, surface glue shortage and fabric leakage, and delamination during tape splicing). These tasks do not require the replacement or weaving of special molds. DETAILED DESCRIPTION

[0013] Phenylene silicone rubber possesses excellent strength, with a tensile strength generally reaching 15-18 MPa, exceeding the strength of ordinary silicone rubber by 7-9 MPa. It also exhibits excellent radiation resistance, making it the most radiation-resistant elastomer known to date. Data show that even under gamma ray irradiation at 2.58×10⁵C / kg (1.0×10⁻⁻⁹), its elongation at break can still reach 50%-100%. Vinyl silicone rubber loses its elasticity and becomes brittle under irradiation at 2.58×10⁵C / kg (1.0×10⁻ ... Acrylate-based rubbers offer excellent resistance to heat and oxygen aging. The saturated structure and polar ester side chains of acrylic rubbers determine their primary application properties, including excellent heat and oxygen aging resistance and oil resistance. Their maximum operating temperature is 180°C, with intermittent or short-term use reaching around 200°C. They show no significant change after years of aging in hot air at 150°C. In contrast, butyl acrylate-based rubbers, due to the increased number of alkyl carbon atoms, offer a greater shielding effect on the polar ester groups, weakening intermolecular forces and increasing internal plasticity. This results in a lower brittle temperature and better cold resistance. The acrylic rubber used in this formulation is Dewey 2212.

[0014] Example 1: A rubber soft mold material for the production of large-scale adhesive tape products, comprising the following components, each component being in parts by weight: based on 100 parts of rubber, 80.0 parts of phenylene silicone rubber; 20.0 parts of acrylic rubber ACM; 0.3 parts of barium stearate; 3.0 parts of zinc stearate; 1.0 parts of stearic acid; 1.5 parts of antioxidant MB; 1.5 parts of accelerator ethylenediamine; 4.0 parts of iron oxide red; parts; talc, 15.0 parts; graphite powder, 1.0 parts; plasticizer DBP, 5.0 parts; high-activity MgO, 1.0 parts; carbon black N330, 8.0 parts; white carbon black 180, 30.0 parts; silane coupling agent KH-550, 3.0 parts; scorch retarder CTP, 0.3 parts; HVA-2, 2.5 parts; sulfur, 0.2 parts; dimethicone 25, 0.4 parts; odorless DCP, 1.0 parts; The iron red is ferric oxide; the white carbon black is silicon dioxide 180; the silane coupling agent KH-550 is 3-aminopropyltriethoxysilane; the talc is Mg3〔Si4O 10〕(OH)2 hydrous magnesium silicate; carbon black N330 is high wear-resistant furnace black (HAF); odorless DCP is bis(1-methyl-1-phenylethyl) diisopropyl benzene peroxide; bis-25 is 2,5-dimethyl-2,5-bis(tert-butyl peroxide)hexane; ethylenediamine is 1,2-diaminoethane; antioxidant MB is 2-mercaptobenzimidazole; plasticizer DBP is dibutyl phthalate; high-activity MgO is high-activity magnesium oxide RA-150; scorch retarder CTP is N-cyclohexylthiophthalimide, and HVA-2 is N,N'-m-phenylene bismaleimide.

[0015] A method for preparing a rubber soft mold material for producing large-scale rubberized cloth products comprises the following steps: Step 1: Prepare the ingredients according to the above recipe; Step 2: Prepare process A rubber compound: add iron oxide red, 70% white carbon black 180, silane coupling agent KH-550, double 25, and odorless DCP to phenylene silicone rubber in the formula ratio, put the above ingredients into an open mill and mix for 20min~30min. The open mill roller temperature is 40℃~55℃. After the compounding agent is evenly dispersed in the rubber, remove the sheet and set aside. Label it as process A rubber compound; Step 3: Preparation process B rubber material: Use 35L internal mixer for pre-mixing, add raw rubber acrylic rubber ACM, lower the top bolt, mix for 90 seconds ± 1 second; raise the top bolt, add stearic acid, barium stearate, zinc stearate, antioxidant MB, high-activity magnesium oxide MgO, anti-scorch agent CTP, HVA-2, lower the top bolt, pressurize and mix for 60 seconds ± 1 second; raise the top bolt, add ethylenediamine, talcum powder, graphite powder, carbon black N330, 30% white carbon black 180 , plasticizer DBP, lower the top bolt, pressurize and mix for 90sec±1sec, lift the top bolt, sweep the chamber, continue pressurizing for 10sec±1sec and then lift the top bolt to discharge the glue, the discharge temperature is ≤110℃, after mixing and discharging, use the open mill to form a 5mm~8mm thick film, park for 8 hours, add sulfur on the open mill and mix for 7min~12min, the open mill roller temperature is 40℃~55℃, mix evenly, and form a 5~8mm thick film, marked as process B rubber; Step 4: Taking 100 parts of rubber as the base, mix the process B rubber material with the process A rubber material and prepare it according to the conventional method of silicone rubber, including batching - rolling - adding medicine and mixing - mixing and homogenizing - sheeting - inspection, and preparation of vulcanized rubber physical property test samples: one stage vulcanization 170℃×20min, two stage vulcanization hot air 150℃×2h +180℃×8h, that is, the hot air temperature stage is 150℃ for 2 hours and then the temperature is increased to 180℃ and continued to heat for 8 hours to obtain a rubber soft mold material for the production of large-scale tape products with aging resistance, high strength and long life.

[0016] Example 2: A rubber soft mold material for the production of large-scale adhesive tape products, comprising the following components, each component being in parts by mass: based on 100 parts of rubber, phenylene silicone rubber, 70.0 parts; acrylic rubber ACM, 30.0 parts; barium stearate, 0.6 parts; zinc stearate, 4.0 parts; stearic acid, 1.4 parts; antioxidant MB, 1.5 parts; accelerator ethylenediamine, 1.5 parts; iron red, 4.0 parts. parts; talc, 16.0 parts; graphite powder, 1.5 parts; plasticizer DBP, 6.0 parts; high-activity MgO, 1.3 parts; carbon black N330, 10.0 parts; white carbon black 180, 25.0 parts; silane coupling agent KH-550, 2.5 parts; scorch retarder CTP, 0.6 parts; HVA-2, 3.0 parts; sulfur, 0.3 parts; dimethicone 25, 0.4 parts; odorless DCP, 0.8 parts; The iron red is ferric oxide; the white carbon black is silicon dioxide 180; the silane coupling agent KH-550 is 3-aminopropyltriethoxysilane; the talc is Mg3〔Si4O 10 〕(OH)2 hydrous magnesium silicate; carbon black N330 is high wear-resistant furnace black (HAF); odorless DCP is bis(1-methyl-1-phenylethyl) diisopropyl benzene peroxide; bis-25 is 2,5-dimethyl-2,5-bis(tert-butyl peroxide)hexane; ethylenediamine is 1,2-diaminoethane; antioxidant MB is 2-mercaptobenzimidazole; plasticizer DBP is dibutyl phthalate; high-activity MgO is high-activity magnesium oxide RA-150; scorch retarder CTP is N-cyclohexylthiophthalimide, and HVA-2 is N,N'-m-phenylene bismaleimide.

[0017] A method for preparing a rubber soft mold material for producing large-scale rubberized cloth products comprises the following steps: Step 1: Prepare the ingredients according to the above recipe; Step 2: Prepare process A rubber compound: add iron oxide red, 70% white carbon black 180, silane coupling agent KH-550, double 25, and odorless DCP to phenylene silicone rubber in the formula ratio, put the above ingredients into an open mill and mix for 20min~30min. The open mill roller temperature is 40℃~55℃. After the compounding agent is evenly dispersed in the rubber, remove the sheet and set aside. Label it as process A rubber compound; Step 3: Preparation process B rubber material: Use 35L internal mixer for pre-mixing, add raw rubber acrylic rubber ACM, lower the top bolt, mix for 90 seconds ± 1 second; raise the top bolt, add stearic acid, barium stearate, zinc stearate, antioxidant MB, high-activity magnesium oxide MgO, anti-scorch agent CTP, HVA-2, lower the top bolt, pressurize and mix for 60 seconds ± 1 second; raise the top bolt, add ethylenediamine, talcum powder, graphite powder, carbon black N330, 30% white carbon black 180, Plasticizer DBP, lower the top bolt, pressurize and mix for 90 seconds ± 1 second, lift the top bolt, sweep the chamber, continue pressurizing for 10 seconds ± 1 second, then lift the top bolt to discharge the glue, the discharge temperature is ≤ 110℃, after mixing and discharging, use an open mill to form a film with a thickness of 5mm~8mm, park for 8 hours, add sulfur on the open mill and mix for 7min~12min, the open mill roller temperature is 40℃~55℃, mix evenly, and form a film with a thickness of 5mm~8mm, which is named as process B rubber; Step 4: Taking 100 parts of rubber as the base, mix the process B rubber material with the process A rubber material and prepare it according to the conventional method of silicone rubber, including batching - rolling - adding medicine and mixing - mixing and homogenizing - sheeting - inspection, and preparation of vulcanized rubber physical property samples: one stage vulcanization 170℃×20min, two stage vulcanization hot air 150℃×2h +180℃×8h, to obtain a rubber soft mold material for the production of large-scale tape products with aging resistance, high strength and long life.

[0018] Example 3: A rubber soft mold material for the production of large-scale adhesive tape products, comprising the following components, with the mass parts of each component being: based on 100 parts of rubber, 50.0 parts of phenylene silicone rubber; 50.0 parts of acrylic rubber ACM; 1.0 parts of barium stearate; 5.0 parts of zinc stearate; 2.0 parts of stearic acid; 1.5 parts of antioxidant MB; 2.0 parts of ethylenediamine; 3.0 parts of iron red; 20.0 parts of talc; 2.0 parts of graphite powder; 8.0 parts of plasticizer DBP; 1.5 parts of highly active MgO; 12.0 parts of carbon black N330; 25.0 parts of white carbon black 180; 2.5 parts of silane coupling agent KH-550; 0.8 parts of scorch retarder CTP; 3.0 parts of HVA-2; 0.3 parts of sulfur; 0.3 parts of bis 25; 0.5 parts of odorless DCP; The iron red is ferric oxide; the white carbon black is silicon dioxide 180; the silane coupling agent KH-550 is 3-aminopropyltriethoxysilane; the talc is Mg3〔Si4O 10〕(OH)2 hydrous magnesium silicate; carbon black N330 is high wear-resistant furnace black (HAF); odorless DCP is bis(1-methyl-1-phenylethyl) diisopropyl benzene peroxide; bis-25 is 2,5-dimethyl-2,5-bis(tert-butyl peroxide)hexane; ethylenediamine is 1,2-diaminoethane; antioxidant MB is 2-mercaptobenzimidazole; plasticizer DBP is dibutyl phthalate; high-activity MgO is high-activity magnesium oxide RA-150; scorch retarder CTP is N-cyclohexylthiophthalimide, and HVA-2 is N,N'-m-phenylene bismaleimide.

[0019] A method for preparing a rubber soft mold material for producing large-scale rubberized cloth products comprises the following steps: Step 1: Prepare the ingredients according to the above recipe; Step 2: Prepare process A rubber compound: add iron oxide red, 70% white carbon black 180, silane coupling agent KH-550, double 25, and odorless DCP to phenylene silicone rubber in the formula ratio, put the above ingredients into an open mill and mix for 20min~30min. The open mill roller temperature is 40℃~55℃. After the compounding agent is evenly dispersed in the rubber, remove the sheet and set aside. Label it as process A rubber compound; Step 3: Preparation process B rubber material: Use 35L internal mixer for pre-mixing, add raw rubber acrylic rubber ACM, lower the top bolt, mix for 90 seconds ± 1 second; raise the top bolt, add stearic acid, barium stearate, zinc stearate, antioxidant MB, high-activity magnesium oxide MgO, anti-scorch agent CTP, HVA-2, lower the top bolt, pressurize and mix for 60 seconds ± 1 second; raise the top bolt, add ethylenediamine, talcum powder, graphite powder, carbon black N330, 30% white carbon black 180, Plasticizer DBP, lower the top bolt, pressurize and mix for 90 seconds ± 1 second, lift the top bolt, sweep the chamber, continue pressurizing for 10 seconds ± 1 second, then lift the top bolt to discharge the glue, the discharge temperature is ≤ 110℃, after mixing and discharging, use an open mill to form a film with a thickness of 5mm~8mm, park for 8 hours, add sulfur on the open mill and mix for 7min~12min, the open mill roller temperature is 40℃~55℃, mix evenly, and form a film with a thickness of 5mm~8mm, which is named as process B rubber; Step 4: Taking 100 parts of rubber as the base, mix the process B rubber material with the process A rubber material and prepare it according to the conventional method of silicone rubber, including batching - rolling - adding medicine and mixing - mixing and homogenizing - sheeting - inspection, and preparation of vulcanized rubber physical property samples: one stage vulcanization 170℃×20min, two stage vulcanization hot air 150℃×2h +180℃×8h, to obtain a rubber soft mold material for the production of large-scale tape products with aging resistance, high strength and long life.

[0020] The combined use of phenylene silicone rubber and acrylic ester rubber (ACM) addresses the poor low-temperature resistance and heat tear resistance of phenylene silicone rubber alone. It also addresses the poor processing of phenylene silicone rubber, ensuring that its mechanical properties, aging resistance, and low-temperature resistance all meet requirements. This extends the service life of soft molds. After implementation in our company's tape molding and manufacturing workshop, the lifespan is 2.5 times that of previous EPDM and chloroprene soft molds. This significantly reduces soft mold costs, achieving the goals of improving quality, increasing efficiency, and reducing costs. This reduces the number of scrapped soft molds and the cost of their subsequent harmless disposal, resulting in significant economic and social benefits.

[0021] The following is a performance comparison of Examples 1-3 with a conventional silicone rubber system (Comparative Example 1), an acrylate rubber (Comparative Example 2), and a chloroprene rubber (Comparative Example 3):

[0022] It can be seen that the physical and mechanical strength, aging resistance, damping performance, wear resistance, rebound performance, and compression permanent deformation resistance of the silicone rubber / acrylate rubber soft mold material of the present invention are greatly improved, and meet the requirements, taking into account both economy and practicality.

Claims

1. A rubber soft mold material for the production of large-scale rubberized tape products, characterized by: The mass proportions of the components are as follows: based on 100 parts of rubber, phenylene silicone rubber, 50-80 parts; acrylic rubber ACM, 20-50 parts; barium stearate, 0.3-1.0 parts; zinc stearate, 3.0-5.0 parts; stearic acid, 1.0-1.5 parts; Antiaging agent MB, 1.5-2.0 parts; accelerator ethylenediamine, 1.5-2.0 parts; iron red, 3.0-4.0 parts; talc, 15.0-20.0 parts; graphite, 1.0-2.0 parts; plasticizer DBP, 5.0-8.0 parts; high-activity MgO, 1.0-1.5 parts; carbon black N330, 8.0-12.0 parts; white carbon black 180, 25.0-30.0 parts; silane coupling agent KH-550, 2.5-3.0 parts; scorch retarder CTP, 0.3-0.8 parts; cross-linking aid HVA-2, 2.5-3.0 parts; sulfur, 0.2-0.3 parts; dimethicone 25, 0.3-0.4 parts; odorless DCP, 0.5-1.0 parts.

2. The rubber soft mold material for producing large-scale adhesive tape products according to claim 1, characterized in that: The iron red is ferric oxide; the white carbon black is silicon dioxide 180; the silane coupling agent KH-550 is 3-aminopropyltriethoxysilane; the talc is Mg3〔Si4O 10 〕(OH)2 hydrous magnesium silicate; carbon black N330 is high wear-resistant furnace black (HAF); odorless DCP is bis(1-methyl-1-phenylethyl) diisopropyl benzene peroxide; bis-25 is 2,5-dimethyl-2,5-bis(tert-butyl peroxide)hexane; ethylenediamine is 1,2-diaminoethane; antioxidant MB is 2-mercaptobenzimidazole; plasticizer DBP is dibutyl phthalate; high-activity MgO is high-activity magnesium oxide RA-150; scorch retarder CTP is N-cyclohexylthiophthalimide, and HVA-2 is N,N'-m-phenylene bismaleimide.

3. A method for preparing a rubber soft mold material for producing large-scale rubberized tape products according to claim 1 or 2, characterized in that: The following steps are involved: Step 1: Prepare the ingredients according to the above recipe; Step 2: Prepare process A rubber compound: Add the following ingredients to the phenylene silicone rubber in order according to the formula ratio: iron oxide red, 70% white carbon black 180, silane coupling agent KH-550, double 25, and odorless DCP. Put the above ingredients into an open mill and mix them for 20 minutes to 30 minutes. The roll temperature of the open mill is 40℃ to 55℃. After the compounding ingredients are evenly dispersed in the rubber, remove the sheet and set aside. Label it as process A rubber compound; Step 3: Preparation process B rubber: Use internal mixer for pre-mixing, add acrylic rubber ACM, lower the top bolt, mix for 90 seconds ± 1 second; raise the top bolt, add stearic acid, barium stearate, zinc stearate, antioxidant MB, high-activity magnesium oxide MgO, anti-scorch agent CTP, HVA-2, lower the top bolt, pressurize and mix for 60 seconds ± 1 second; raise the top bolt, add ethylenediamine, talcum powder, graphite powder, carbon black N330, 30% white carbon black 180 , plasticizer DBP, lower the top bolt, pressurize and mix for 90sec±1sec, lift the top bolt, sweep the chamber, continue pressurizing for 10sec±1sec, lift the top bolt, discharge the glue, the discharge temperature is ≤110℃, use the open mill to make a 5mm~8mm thick film, stop for 8 hours, then add sulfur and mix for 7min~12min on the open mill, the open mill roller temperature is 40℃~55℃, mix evenly, and cut into a 5mm~8mm thick film, marked as process B rubber; Step 4: Prepare a compounded silicone rubber mixture by combining the process B rubber compound and the process A rubber compound according to a conventional silicone rubber method, including: Ingredients: 1 part of process B rubber, 1.6 parts of process A rubber; Roller wrapping: The roll temperature of the mixing mill is 40℃~55℃, and the rubber compound in process A is evenly wrapped around the roll; Adding and mixing: After the process A rubber material is evenly coated on the roller, add the process B rubber material and mix for 20min~30min until the two components are evenly mixed; Sheeting: Use a three-roll calender at 40℃~55℃ to calender and extrude the film; Inspection: Preparation of physical and mechanical properties of vulcanized rubber samples: one-stage vulcanization at 170℃×20min, and the second-stage vulcanization with hot air at 150℃×2h + 180℃×8h, to obtain a rubber soft mold material for the production of large-scale tape products that is resistant to aging, high-strength, and long-life.

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