High-pressure-gas-resistant tear-resistant water heater sealing rubber material and production process thereof

Abstract

The invention relates to the technical field of sealing rubber, and discloses a high-pressure gas-resistant tear-resistant water heater sealing rubber material and a production process thereof, the high-pressure gas-resistant tear-resistant water heater sealing rubber material comprises the following raw materials by weight: 90-110 parts of a rubber matrix, 60-80 parts of nitrile rubber, and 20-40 parts of hydrogenated nitrile rubber; the acrylonitrile content of the nitrile rubber is 32%-36%; the composite material comprises the following components in parts by weight: 30-45 parts of a reinforcing filler system, 20-30 parts of carbon black N550 and 8-15 parts of nano white carbon black, and the nano white carbon black is precipitated white carbon black. 1.5 to 3 parts of a coupling agent, wherein the coupling agent is at least one of bis-(gamma-triethoxysilylpropyl) tetrasulfide and bis-(gamma-triethoxysilylpropyl) disulfide; the nitrile rubber and the hydrogenated nitrile rubber are cooperatively used, the carbon black N550 and the nano white carbon black in a specific proportion are matched to form a reinforcing system, and meanwhile, the silane coupling agent is used for enhancing interface bonding, so that the material has excellent mechanical properties and high pressure resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing rubber, in particular to a high-pressure-resistant and tear-resistant sealing rubber material for water heaters and a production process thereof. BACKGROUND

[0002] In the field of sealing rubber materials for water heaters, traditional materials mostly use nitrile rubber as the base body and are reinforced by conventional fillers and vulcanization systems, but have problems such as insufficient high-pressure resistance, low tear resistance, easy aging failure after long-term use, etc. In the existing production process, the anti-aging agent is usually added in a physical mixing manner and is prone to migration or volatilization under high temperature or high pressure, resulting in short-term anti-aging effect. At the same time, the vulcanization process mostly uses a single mold pressing process, which has insufficient cross-linking density and is prone to internal bubbles and volatile residue, affecting the compactness and dimensional stability of the sealing part. In addition, the interface between the filler and the rubber is weak, which limits the further improvement of the mechanical properties of the material. SUMMARY

[0003] The present application aims to provide a high-pressure-resistant and tear-resistant sealing rubber material for water heaters and a production process thereof to solve the problems raised in the background.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a high-pressure-resistant and tear-resistant sealing rubber material for water heaters, the raw material composition of which comprises, by weight: 90-110 parts of a rubber base body, 60-80 parts of nitrile rubber, 20-40 parts of hydrogenated nitrile rubber; the acrylonitrile content of the nitrile rubber is 32%-36%; 30-45 parts of a reinforcing filler system, 20-30 parts of carbon black N550, 8-15 parts of nano white carbon black, the nano white carbon black being a precipitated white carbon black; 1.5-3 parts of a coupling agent, the coupling agent being at least one of bis-(γ-triethoxysilylpropyl) tetrasulfide and bis-(γ-triethoxysilylpropyl) disulfide; 5-7 parts of an activator, 4-6 parts of zinc oxide, and 0.8-1.2 parts of stearic acid.

[0005] Preferably, it further comprises 3-5 parts of an anti-aging system, 1.0-2.0 parts of antioxidant 445 (4,4'-bis(α,α-dimethylbenzyl) diphenylamine), 0.8-1.5 parts of metal deactivator MBZ (2-mercaptobenzimidazole zinc salt), 0.5-1.0 parts of reactive antioxidant NAPM (N-(4-anilino phenyl) methacrylamide), and 0.3-0.8 parts of ultraviolet absorber UV-531 (2-hydroxy-4-n-octyloxybenzophenone).

[0006] Preferably, the total amount of the anti-aging system is 3.5-4.5 parts, wherein the antioxidant 445 is 1.2-1.8 parts, the metal deactivator MBZ is 1.0-1.2 parts, the reactive antioxidant NAPM is 0.6-0.8 parts, and the ultraviolet absorber UV-531 is 0.4-0.6 parts.

[0007] Preferably, the processing aid is 10-15 parts, the polymeric ester plasticizer TP-958 is 12 parts, and the low molecular weight polyethylene wax is 1.5-3.0 parts; the total amount of the processing aid is 11-13 parts, wherein the TP-95 is 10-12 parts and the polyethylene wax is 1.5-2.0 parts; the vulcanization system is 3.0-4.5 parts, 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane is 1.2-1.8 parts, the primary accelerator CZ is 0.8-1.2 parts, the auxiliary accelerator TRA is 0.5-1.0 parts, and the co-crosslinking agent TAIC is 0.5-1.0 parts; the total amount of the vulcanization system is 3.5-4.0 parts, wherein 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane is 1.4-1.6 parts, CZ is 1.0-1.1 parts, TRA is 0.6-0.8 parts, and TAIC is 0.6-0.8 parts.

[0008] A production process of a high-pressure gas resistant tear-resistant hot water heater sealing rubber material, comprising the following steps: S1: masterbatch preparation: in a mixer, sequentially add and mix rubber and various additives to form a base rubber material; then cool, thin pass, and sheet on an open mill, and store at room temperature for more than 8 hours to allow the components to fully penetrate and relax; S2: heat treatment and antioxidant bonding: add the stored masterbatch, antioxidant, and antioxidant to a torque rheometer, and treat under the action of heat and shear force; S3: final mixing and vulcanizing agent dispersion: slowly mix the heat-treated rubber material with the vulcanization system on a low-temperature open mill; ensure uniform dispersion through mixing and thinning operations, and strictly control the temperature to prevent scorching, and finally sheet and cool; S4: filtration and preforming: filter the final mixed rubber through a rubber filter to remove impurities, and then form a rubber blank with a specific shape and weight through a preforming machine; the rubber blank should be properly wrapped and stored, and used within 48 hours; S5: segmented mold vulcanization: one-stage vulcanization: vulcanize the rubber blank in a high-temperature and high-pressure mold for 8-12 minutes to form a preliminary crosslinking network; quickly release the volatile gas by briefly opening the mold to reduce internal bubbles; two-stage vulcanization: place the product in a hot air oven for long-term secondary vulcanization to improve crosslinking density, stability, heat resistance, and eliminate internal stress and volatile matter.

[0009] Preferably, the step S1 is specifically; Preheat the internal mixer to 50-70℃, put in the butyl rubber and hydrogenated butyl rubber, plasticize for 60-90 seconds at a speed of 30-50 rpm, so that the rubber covers the roller and is preliminarily softened and fused; Release pressure, lift the upper plunger, add stearic acid, zinc oxide, nano white carbon black and coupling agent, lower the upper plunger, mix for 60-90 seconds at the same speed, and control the temperature at 80-95℃; Release pressure, lift the upper plunger, add half the weight of carbon black N550 and half the weight of processing aid TP-95, lower the upper plunger, mix for 60-90 seconds, and the temperature rises to 100-110℃; Release pressure, lift the upper plunger, add the remaining half of carbon black N550 and the remaining TP-95, lower the upper plunger, and continue mixing until the power curve is stable or the temperature reaches 130-140℃, with a total mixing time of about 240-300 seconds; Discharge the glue, transfer the masterbatch to the open mill, pass through the cooling water, pass through 3-5 times, and hit the triangle bag 3 times, and then cut into a rubber sheet with a thickness of about 8-10 mm; Cool the rubber sheet at room temperature for not less than 8 hours to allow the compounding agents to fully penetrate and disperse, and the stress of the rubber molecular chain to relax.

[0010] Preferably, the step S2 is specifically; Cut the masterbatch after standing into small pieces, and put it into the mixing chamber of the torque rheometer together with the reactive antioxidant NAPM, antioxidant 445, metal deactivator MBZ and ultraviolet absorber UV-531; Set the initial temperature of the mixing chamber to 100℃, the rotor speed to 60-80 rpm, and the processing time to 5-8 minutes; during this process, the material undergoes shearing and thermal history, and the temperature gradually rises and stabilizes at 110-125℃; Utilize shearing force and heat energy to promote further reaction of the coupling agent with white carbon black and rubber molecules, and at the same time, the methacrylamide group of the reactive antioxidant NAPM reacts with the rubber molecular chain (especially the residual double bond of HNBR) to realize graft copolymerization and chemical bonding of the antioxidant; the torque curve displayed by the torque rheometer tends to be stable, indicating that the processing is complete.

[0011] Preferably, the step S3 is specifically; Set the open mill roller temperature to 45-55℃ and the roller gap to 3-4 mm; put the rubber material obtained in S2 into the front roller to form a smooth wrapped rubber; Slowly add low molecular weight polyethylene wax, accelerator CZ, auxiliary accelerator TRA, co-crosslinking agent TAIC and 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane in turn; ensure that each additive is fully incorporated into the rubber before adding the next one; After all the auxiliary agents are added, cut and flip 3-5 times, then adjust the roll gap to 1-1.5mm, and thin pass 6-8 times; this process needs to strictly control the roll temperature not to exceed 65℃, to prevent scorching; hit the triangle bag 5-7 times, to further uniformly disperse; adjust the roll gap to 3-4mm, and down sheet, to obtain the final rubber sheet with uniform thickness and smooth surface; after down sheet, the rubber is placed on a metal plate for forced air cooling to room temperature.

[0012] Preferably, the step S4 is specifically; The final rubber is filtered through a rubber filter equipped with a 250 mesh filter screen to remove trace impurities and undispersed gel particles; the filtered rubber is made into a rubber blank with a certain weight and shape through a preforming machine (such as a screw extruder or precision cutting) according to the cross-sectional shape and size of the sealing ring product; The rubber blank is wrapped with polyethylene film or placed in a sealed container for use, with a storage time not exceeding 48 hours.

[0013] Preferably, the step S5 is specifically; Primary mold vulcanization: the preformed rubber blank is placed in a mold cavity preheated to 160-170℃; the mold is closed, and the pressure is maintained at 10-15MPa for 8-12 minutes; during this stage, the peroxide decomposes to generate free radicals, which initiate the formation of C-C crosslinking bonds between the rubber molecular chain and the co-crosslinking agent; at the same time, the sulfur accelerator system also begins to play a role, forming part of the polysulfide bond and building an initial crosslinking network; Fast pressure relief and exhaust: after the first stage of vulcanization is completed, the mold is briefly opened for about 1-3 seconds (mold is slightly opened), to release the water vapor or low molecular volatile substances that may accumulate in the mold cavity, and then quickly closed again to full closure; this operation helps to reduce the internal bubbles of the product and improve the density; Secondary oven vulcanization: the sealing ring product after the first stage of vulcanization is taken out of the mold and immediately placed in a circulating air hot air oven preheated to 150-160℃; secondary vulcanization is carried out at this temperature for 120-150 minutes; After the second stage of vulcanization is completed, the product is cooled to below 80℃ with the oven and taken out, to obtain the final high-pressure gas-resistant tear-resistant water heater sealing ring product.

[0014] Compared with the prior art, the beneficial effects of the present application are: 1. The use of nitrile rubber and hydrogenated nitrile rubber in cooperation, combined with a specific proportion of carbon black N550 and nano white carbon black to form a reinforcing system, and the use of silane coupling agent to enhance the interface bonding, makes the material have excellent mechanical properties and high pressure resistance; compared with the traditional formula, it can effectively resist the stress action in the high pressure gas environment, significantly improve the sealing reliability and tear resistance; 2. By introducing reactive antioxidant NAPM and combining torque rheometer heat treatment to realize its chemical bonding with rubber molecules, effectively solve the problem of durability caused by easy migration and volatilization of traditional antioxidants; combined with segmented mold vulcanization and rapid exhaust process, significantly improve the crosslinking density and product density, reduce the compression set, and eliminate internal bubbles and volatile residues. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0016] The present application provides a kind of technical scheme: a kind of high pressure resistant gas tear resistant water heater sealing rubber material, according to weight parts, its raw material composition includes: rubber matrix 90-110 parts, nitrile rubber (NBR) 60-80 parts, hydrogenated nitrile rubber (HNBR) 20-40 parts;The acrylonitrile content of the nitrile rubber is 32%-36%, and the Mooney viscosity [ML (1+4) 100 ℃] is 45-65;The residual double bond content of the hydrogenated nitrile rubber is less than 5%, and the Mooney viscosity [ML (1+4) 100 ℃] is 50-70;The rubber matrix is 100 parts, wherein NBR is 65-75 parts, and HNBR is 25-35 parts;Reinforcing filler system 30-45 parts, carbon black N550 20-30 parts, nano white carbon black 8-15 parts, the nano white carbon black is precipitated white carbon black, and the specific surface area is 150-200 m² / g, and the total amount of the reinforcing filler system is 35-40 parts, wherein carbon black N550 is 23-27 parts, and nano white carbon black is 9-12 parts;Coupling agent 1.5-3 parts, the coupling agent is at least one of bis-(gamma-triethoxysilyl propyl) tetrasulfide, bis-(gamma-triethoxysilyl propyl) disulfide;Activator 5-7 parts, zinc oxide 4-6 parts, stearic acid 0.8-1.2 parts.

[0017] Further, it also includes anti-aging system 3-5 parts, antioxidant 445 (4,4'-bis (alpha, alpha-dimethylbenzyl) diphenylamine) 1.0-2.0 parts, metal deactivator MBZ (2-mercapto benzimidazole zinc salt) 0.8-1.5 parts, reactive antioxidant NAPM (N-(4-anilino phenyl) methacrylamide) 0.5-1.0 parts, ultraviolet absorber UV-531 (2-hydroxy-4-n-octyloxy benzophenone) 0.3-0.8 parts.

[0018] Further, the total amount of the anti-aging system is 3.5-4.5 parts, wherein the antioxidant 445 is 1.2-1.8 parts, the metal deactivator MBZ is 1.0-1.2 parts, the reactive antioxidant NAPM is 0.6-0.8 parts, and the ultraviolet absorber UV-531 is 0.4-0.6 parts.

[0019] Further, the processing aid is 10-15 parts, the polymer ester plasticizer TP-958 is 12 parts, and the low molecular weight polyethylene wax is 1.5-3.0 parts; the total amount of the processing aid is 11-13 parts, wherein the TP-95 is 10-12 parts, and the polyethylene wax is 1.5-2.0 parts; the curing system is 3.0-4.5 parts, 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane (dicumyl peroxide) is 1.2-1.8 parts, the main accelerator CZ (N-cyclohexyl-2-benzothiazole sulfenamide) is 0.8-1.2 parts, the auxiliary accelerator TRA (diamyl thiomethyl thiuram tetrasulfide) is 0.5-1.0 parts, and the co-crosslinking agent TAIC (triallyl isocyanurate) is 0.5-1.0 parts; the total amount of the curing system is 3.5-4.0 parts, wherein the 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane is 1.4-1.6 parts, the CZ is 1.0-1.1 parts, the TRA is 0.6-0.8 parts, and the TAIC is 0.6-0.8 parts.

[0020] A production process of a high-pressure gas resistant tear-resistant hot water heater sealing rubber material is characterized in that it comprises the following steps: S1: masterbatch preparation: in a mixer, various compounding agents are sequentially added and mixed to form a base rubber material; then, the masterbatch is cooled, thinned, and sheeted on an open mill, and is stored at room temperature for more than 8 hours to allow the components to fully penetrate and relax; S2: heat treatment and antioxidant bonding: the stored masterbatch is added to a torque rheometer with antioxidants and antioxidants, and is treated under the action of heat and shear force; S3: final mixing and vulcanizing agent dispersion: the heat-treated rubber material is slowly mixed with the curing system on a low-temperature open mill; uniform dispersion is ensured through mixing and thinning operations, and the temperature is strictly controlled to prevent scorching, and finally the sheet is cooled; S4: filtration and preforming: the final mixed rubber is filtered by a rubber filter to remove impurities, and then a specific shape and weight of rubber blank is formed by a preforming machine; the rubber blank is properly wrapped and stored, and used within 48 hours; S5: segmented mold vulcanization: one-stage vulcanization: the rubber blank is vulcanized in a high-temperature and high-pressure mold for 8-12 minutes to form a preliminary crosslinking network; rapid exhaust: short mold opening to release volatile gases and reduce internal bubbles; two-stage vulcanization: the product is placed in a hot air oven for long-term secondary vulcanization to improve crosslinking density, stability, heat resistance, and eliminate internal stress and volatile matter.

[0021] Further, the step S1 is specifically; Preheat the internal mixer to 50-70℃, put in nitrile rubber (NBR) and hydrogenated nitrile rubber (HNBR), plasticize at a speed of 30-50 revolutions per minute, pressurize (top pin pressure 0.4-0.6 MPa) for 60-90 seconds, so that the rubber wraps the roll and is preliminarily softened and fused; Release the pressure, lift the top pin, add stearic acid, zinc oxide, nano white carbon black and coupling agent (Si-69), lower the top pin, mix at the same speed for 60-90 seconds, and control the temperature at 80-95℃; Release the pressure, lift the top pin, add half the weight of carbon black N550 and half the weight of processing aid TP-95, lower the top pin, mix for 60-90 seconds, and raise the temperature to 100-110℃; Release the pressure, lift the top pin, add the remaining half of carbon black N550 and the remaining TP-95, lower the top pin, and continue mixing until the power curve is stable or the temperature reaches 130-140℃, with a total mixing time of about 240-300 seconds; Discharge the rubber, transfer the masterbatch to the open mill, pass cooling water (roll temperature <50℃), pass thinly (roll gap -1mm) 3-5 times, and pack into a triangle bag 3 times, and then sheet into a rubber sheet with a thickness of about 8-10mm; Cool and park the rubber sheet at room temperature for not less than 8 hours, so that the compounding agents fully penetrate and disperse, and the stress of the rubber molecular chain relaxes.

[0022] Further, the step S2 is specifically; Cut the masterbatch after parking into small pieces, and put it into the mixing chamber of the torque rheometer together with reactive antioxidant NAPM, antioxidant 445, metal deactivator MBZ and ultraviolet absorber UV-531; Set the initial temperature of the mixing chamber to 100℃, the rotor speed to 60-80 revolutions per minute, and the processing time to 5-8 minutes; during this process, the material undergoes shearing and thermal history, and the temperature gradually rises and stabilizes at 110-125℃; Utilize shearing force and heat energy to promote further reaction of the coupling agent with white carbon black and rubber molecules, and at the same time, graft copolymerization reaction occurs between the methacrylamide groups of the reactive antioxidant NAPM and the rubber molecular chain (especially the residual double bonds of HNBR), realizing chemical bonding and fixation of the antioxidant; the torque curve displayed by the torque rheometer tends to be stable, indicating that the processing is complete.

[0023] Further, the step S3 is specifically; Set the open mill roll temperature to 45-55℃ and the roll gap to 3-4mm; put in the rubber material obtained in S2, so that it wraps the front roll and forms a smooth wrapped rubber; Low molecular weight polyethylene wax, accelerator CZ, auxiliary accelerator TRA, co-crosslinking agent TAIC and 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane were added in turn slowly; make sure each auxiliary is fully melted into the rubber before adding the next one; After all the auxiliaries were added, the rubber was cut and flipped 3-5 times, and then the roll gap was adjusted to 1-1.5 mm, and it was passed through 6-8 times; this process needs to strictly control the roll temperature not to exceed 65℃, to prevent scorching; the rubber was wrapped in a triangular bag for 5-7 times to further disperse uniformly; the roll gap was adjusted to 3-4 mm, and the sheet was obtained, which was uniform in thickness and smooth in surface; after the sheet was obtained, the rubber was placed on a metal plate and forced air cooling to room temperature.

[0024] Further, the step S4 is specifically; The final rubber was filtered through a rubber filter equipped with a 250 mesh filter screen to remove trace impurities and undispersed gel particles; the filtered rubber was made into a certain weight and shape by a preforming machine (such as a screw extruder or precision cutting) according to the cross-sectional shape and size of the sealing ring product; The rubber blank was wrapped with polyethylene film or placed in a sealed container for use, and the storage time was not more than 48 hours.

[0025] Further, the step S5 is specifically; Primary mold vulcanization: the preformed rubber blank was placed in a mold cavity preheated to 160-170℃; the mold was closed, and the rubber was vulcanized at a pressure of 10-15 MPa for 8-12 minutes; during this stage, the peroxide decomposes to generate free radicals, which initiate the formation of C-C crosslinking bonds between the rubber molecular chain and the co-crosslinking agent; at the same time, the sulfur accelerator system also begins to play a role, forming part of the polysulfide bond and building an initial crosslinking network; Fast pressure relief and exhaust: after the first stage of vulcanization, the mold was briefly opened for about 1-3 seconds (mold micro-opening) to release the water vapor or low molecular volatile substances that may accumulate in the mold cavity, and then quickly closed again to fully close; this operation helps to reduce internal bubbles in the product and improve density; Secondary oven vulcanization: the sealing ring product after the first stage of vulcanization was immediately placed in a circulating air hot air oven preheated to 150-160℃; secondary vulcanization was carried out at this temperature for 120-150 minutes; the purpose of secondary vulcanization is to: make the peroxide decomposition more complete, further increase the crosslinking density and tend to be stable; promote the sulfur accelerator system to further react, optimize the conversion of polysulfide bond to single / double sulfur bond, and improve heat resistance; eliminate internal stress generated during the first stage of vulcanization, reduce product deformation; drive out more low molecular volatile substances, stabilize product size and performance; After the second stage of vulcanization, the product was cooled to below 80℃ with the oven and taken out, and the final high-pressure gas resistant tear-resistant water heater sealing ring product was obtained.

[0026] Example 1: Take NBR (AN 34%, Mooney 55) 70 parts, HNBR (residual double bond <3%, Mooney 60) 30 parts, carbon black N550 25 parts, nano white carbon black (VN3, specific surface area -180 m2 / g) 10 parts, Si-69 2 parts, zinc oxide 5 parts, stearic acid 1 part, antioxidant 445 1.5 parts, MBZ 1.0 part, NAPM 0.8 part, UV-531 0.5 part, TP-95 1.5 parts, polyethylene wax 1.5 parts, 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane 1.5 parts, CZ 1.0 part, TRA 0.7 part, TAIC 0.7 part; prepared by the above preparation method; Example 2: Take NBR 65 parts, HNBR 35 parts, carbon black N550 28 parts, nano white carbon black 12 parts, Si-69 2.2 parts, zinc oxide 5 parts, stearic acid 1 part, antioxidant 445 1.8 parts, MBZ 1.2 parts, NAPM 0.7 parts, UV-531 0.6 parts, TP-95 1.1 parts, polyethylene wax 2.0 parts, 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane 1.6 parts, CZ 1.1 parts, TRA 0.8 parts, TAIC 0.8 parts; the preparation method is the same as example 1; Comparative Example 1: NBR 100 parts, carbon black N550 40 parts, zinc oxide 5 parts, stearic acid 1 part, antioxidant RD 1.5 parts, antioxidant MB 1 part, plasticizer DOP 10 parts, accelerator CZ 1.5 parts, accelerator TMTD 0.3 parts, sulfur 1.8 parts; using the traditional mixing and mixing with sulfur method, one-stage mold vulcanization; Comparative Example 2: Use the formula of Example 1, but omit S2 step; add antioxidant 445, MBZ, NAPM, UV-531 with the vulcanizing agent together in the open mill in S3 step; the rest of the steps are the same as Example 1; The specific properties are shown in the following table: As shown in the above table, the product prepared by using the raw material ratio and preparation method of Example 2 has the best performance It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0027] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A high pressure resistant, gas resistant, tear resistant, hot water heater sealing rubber material, characterized in that, The raw material composition includes, by weight parts: rubber matrix 90-110 parts, nitrile rubber 60-80 parts, hydrogenated nitrile rubber 20-40 parts; the acrylonitrile content of the nitrile rubber is 32%-36%; reinforcing filler system 30-45 parts, carbon black N550 20-30 parts, nano white carbon black 8-15 parts, the nano white carbon black is a precipitated white carbon black; coupling agent 1.5-3 parts, the coupling agent is at least one of bis-(gamma-triethoxysilylpropyl) tetrasulfide, bis-(gamma-triethoxysilylpropyl) disulfide; activator 5-7 parts, zinc oxide 4-6 parts, stearic acid 0.8-1.2 parts.

2. A high pressure fuel resistant, tear resistant, water heater sealing rubber material as claimed in claim 1, wherein: It also includes an anti-aging system 3-5 parts, antioxidant 445 (4,4'-bis(alpha,alpha-dimethylbenzyl) diphenylamine) 1.0-2.0 parts, metal deactivator MBZ (2-mercaptobenzimidazole zinc salt) 0.8-1.5 parts, reactive antioxidant NAPM (N-(4-anilino phenyl) methacrylamide) 0.5-1.0 parts, ultraviolet absorber UV-531 (2-hydroxy-4-n-octyloxybenzophenone) 0.3-0.8 parts.

3. A high pressure fuel resistant, tear resistant, water heater sealing rubber material as claimed in claim 2, wherein: The total amount of the anti-aging system is 3.5-4.5 parts, wherein antioxidant 445 is 1.2-1.8 parts, metal deactivator MBZ is 1.0-1.2 parts, reactive antioxidant NAPM is 0.6-0.8 parts, and ultraviolet absorber UV-531 is 0.4-0.6 parts.

4. A high pressure fuel resistant, tear resistant, water heater sealing rubber material as claimed in claim 1, wherein: It also includes a processing aid 10-15 parts, a polymeric ester plasticizer TP-958-12 parts, and a low molecular weight polyethylene wax 1.5-3.0 parts; the total amount of the processing aid is 11-13 parts, wherein TP-95 is 10-12 parts and the polyethylene wax is 1.5-2.0 parts; a curing system 3.0-4.5 parts, 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane 1.2-1.8 parts, primary accelerator CZ 0.8-1.2 parts, auxiliary accelerator TRA 0.5-1.0 parts, and co-crosslinking agent TAIC 0.5-1.0 parts; the total amount of the curing system is 3.5-4.0 parts, wherein 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane is 1.4-1.6 parts, CZ is 1.0-1.1 parts, TRA is 0.6-0.8 parts, and TAIC is 0.6-0.8 parts.

5. A process for the production of a high pressure gas resistant, tear resistant, hot water resistant, sealing rubber material, characterized in that: It includes the following steps: S1: masterbatch preparation: in a mixer, the rubber and various additives are sequentially added and mixed to form a base rubber; then cooled, thin pass, and sheeted on an open mill, and stored at room temperature for more than 8 hours to allow the components to fully penetrate and relax; S2: heat treatment and antioxidant bonding: the stored masterbatch, antioxidant, and other additives are added to a torque rheometer for treatment under heat and shear force; S3: final mixing and curing agent dispersion: the heat-treated rubber and curing system are slowly mixed on a low-temperature open mill; uniform dispersion is ensured through mixing and thinning operations, and the temperature is strictly controlled to prevent scorching, and finally sheeted and cooled. S4: Filtering and Preforming: The final rubber compound is filtered by a filter press to remove impurities, and then formed into a specific shape and weight by a preforming machine; the rubber blank should be properly wrapped and stored, and used within 48 hours; S5: Sectional Mold Pressing and Vulcanization: First-stage vulcanization: the rubber blank is vulcanized in a high-temperature and high-pressure mold for 8-12 minutes to form a preliminary cross-linking network; rapid exhaust: short mold opening to release volatile gases and reduce internal bubbles; second-stage vulcanization: the product is placed in a hot air oven for long-term secondary vulcanization to improve cross-linking density, stability, heat resistance, and eliminate internal stress and volatile substances.

6. The process for producing a high pressure gas resistant, tear resistant, water heater sealing rubber material according to claim 5, characterized in that: The step S1 is specifically; Preheat the internal mixer to 50-70℃, and add nitrile rubber and hydrogenated nitrile rubber, and plasticize under pressure for 60-90 seconds at a speed of 30-50 revolutions per minute to make the rubber wrap the roller and soften and fuse initially; Release the pressure, lift the upper plunger, add stearic acid, zinc oxide, nano white carbon black, and coupling agent, and lower the upper plunger, and mix for 60-90 seconds at the same speed, with the temperature controlled at 80-95℃; Release the pressure, lift the upper plunger, add half the weight of carbon black N550 and half the weight of processing aid TP-95, lower the upper plunger, and mix for 60-90 seconds, with the temperature rising to 100-110℃; Release the pressure, lift the upper plunger, add the remaining half of the carbon black N550 and the remaining TP-95, lower the upper plunger, and continue mixing until the power curve is stable or the temperature reaches 130-140℃, with the total mixing time being about 240-300 seconds; Discharge the rubber, transfer the masterbatch to the open mill, pass cooling water, and pass 3-5 times, and pack 3 times, and then cut into rubber sheets with a thickness of about 8-10mm; Cool and store the rubber sheets at room temperature for not less than 8 hours to allow the compounding agents to fully penetrate and disperse, and the stress of the rubber molecular chain to relax.

7. The process for producing a high pressure gas resistant, tear resistant, water heater sealing rubber material according to claim 5, characterized in that: The step S2 is specifically; Cut the masterbatch after storage into small pieces, and add reactive antioxidant NAPM, antioxidant 445, metal deactivator MBZ, and ultraviolet absorber UV-531 into the mixing chamber of the torque rheometer; Set the initial temperature of the mixing chamber to 100℃, the rotor speed to 60-80 revolutions per minute, and the processing time to 5-8 minutes; during this process, the material undergoes shearing and thermal history, and the temperature gradually rises and stabilizes at 110-125℃; Utilize shearing force and heat energy to promote further reaction of the coupling agent with white carbon black and rubber molecules, and at the same time, graft copolymerization reaction of the methacrylamide group of the reactive antioxidant NAPM with the rubber molecular chain occurs to realize chemical bonding of the antioxidant; the torque curve displayed by the torque rheometer tends to be stable, indicating that the processing is complete.

8. The process for producing a high pressure gas resistant, tear resistant, water heater sealing rubber material according to claim 5, characterized in that: The step S3 is specifically; Set the roller temperature of the open mill to 45-55℃, and adjust the roller gap to 3-4mm; add the rubber material obtained in S2 to make it wrap the front roller to form smooth wrapped rubber; Slowly add low molecular weight polyethylene wax, accelerator CZ, auxiliary accelerator TRA, co-crosslinking agent TAIC, and 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane in sequence; ensure that each additive is fully incorporated into the rubber before adding the next one; After all the auxiliary agents are added, cut and flip 3-5 times, then adjust the roll gap to 1-1.5mm, and pass 6-8 times; the roll temperature should be strictly controlled not to exceed 65℃ to prevent scorching; hit the triangle bag 5-7 times to further disperse evenly; adjust the roll gap to 3-4mm, and down the sheet to get the final sheet of rubber with uniform thickness and smooth surface; after down the sheet, the rubber is placed on a metal plate for forced air cooling to room temperature.

9. The process for producing a high pressure gas resistant, tear resistant, water heater sealing rubber material according to claim 5, characterized in that: The step S4 is specifically; The final rubber is filtered through a rubber filter equipped with a 250 mesh filter screen to remove trace impurities and undispersed gel particles; the filtered rubber is formed into a rubber blank with a certain weight and shape according to the cross-sectional shape and size of the sealing ring product through a preforming machine; The rubber blank is wrapped with polyethylene film or placed in a sealed container for use, and the storage time should not exceed 48 hours.

10. The process for producing a high pressure gas resistant, tear resistant, water heater sealing rubber material according to claim 5, characterized in that: The step S5 is specifically; Primary mold vulcanization: the preformed rubber blank is placed in a mold cavity preheated to 160-170℃; the mold is closed, and the pressure is maintained at 10-15MPa for 8-12 minutes; At this stage, the decomposition of peroxide generates free radicals, which initiate the formation of C-C crosslinking bonds between rubber molecular chains and co-crosslinking agents; at the same time, the sulfur accelerator system also starts to work, forming part of the polysulfide bond and building a preliminary crosslinking network; Fast pressure relief and exhaust: after the first stage of vulcanization, the mold is briefly opened for about 1-3 seconds to release the water vapor or low molecular volatile substances that may accumulate in the mold cavity, and then quickly closed again to fully close; this operation helps to reduce internal bubbles of the product and improve the density; Secondary oven vulcanization: the sealing ring product after the first stage of vulcanization is taken out of the mold and immediately placed in a circulating air hot air oven preheated to 150-160℃; secondary vulcanization is carried out at this temperature for 120-150 minutes; After the second stage of vulcanization, the product is cooled to below 80℃ with the oven and taken out to obtain the final high-pressure gas resistant tear-resistant water heater sealing ring product.