Non-asbestos fiber rubber gasket for chemical plant

Abstract

The application provides a non-asbestos fiber rubber gasket for a chemical plant, and relates to the technical field of rubber gaskets. The non-asbestos fiber rubber gasket for the chemical plant comprises a gasket body, trapezoidal protrusions and trapezoidal grooves are alternately distributed on the upper and lower ends of the gasket body, the distal sides of the trapezoidal protrusions are uniformly provided with round convex points, and the distal sides of the trapezoidal grooves are uniformly provided with round convex points; the rubber material used by the non-asbestos fiber rubber gasket comprises the following raw materials in parts by weight: 8-10 parts of rubber master batch, 1-2 parts of non-asbestos fiber, 0.2-0.3 parts of accelerator, 0.2-0.3 parts of anti-aging agent, 0.2-0.4 parts of vulcanizing agent, 0.1-0.3 parts of foaming agent and 0.2-0.4 parts of crosslinking agent. The non-asbestos fiber rubber gasket has better mechanical properties, moderate hardness, better sealing effect, higher compression rate and higher resilience, and can be used for a longer time during pipeline maintenance and replacement.

Description

Technical Field

[0001] This invention relates to the field of rubber gasket technology, specifically to a non-asbestos fiber rubber gasket for use in chemical plants. Background Technology

[0002] Gaskets are commonly used in machinery, equipment, or pipelines; they are a type of sealing component used wherever fluids are involved. Gaskets can be classified by material into metal gaskets and non-metal gaskets. Metal gaskets include copper gaskets, stainless steel gaskets, iron gaskets, and aluminum gaskets, while non-metal gaskets include asbestos gaskets, non-asbestos gaskets, paper gaskets, and rubber gaskets.

[0003] Asbestos gaskets are made primarily from asbestos fibers and rubber, supplemented with rubber compounding agents and fillers, through processes such as mixing, hot rolling, and vulcanization. Asbestos gaskets offer superior sealing performance and corrosion resistance, and are inexpensive. However, asbestos is internationally recognized as a carcinogen, and asbestos-free technology is a current research trend in environmental protection. However, existing non-asbestos gaskets, when installed inside machinery, are subjected to pressure from the pipes at both ends, and their hardness, crack resistance, and compression resilience all need improvement. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a non-asbestos fiber rubber gasket for chemical plants, which solves the problems mentioned in the background section.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: a non-asbestos fiber rubber gasket for chemical plants, comprising a gasket body, wherein trapezoidal protrusions and trapezoidal grooves are alternately distributed at the upper and lower ends of the gasket body, and round protrusions are evenly distributed on the opposite side of the trapezoidal protrusions, and round protrusions are evenly distributed on the opposite side of the trapezoidal grooves.

[0008] The rubber material used in non-asbestos fiber rubber gaskets:

[0009] The gasket body material is made from the following raw materials in parts by weight: 8-10 parts rubber masterbatch, 1-2 parts non-asbestos fiber, 0.2-0.3 parts accelerator, 0.2-0.3 parts antioxidant, 0.2-0.4 parts vulcanizing agent, 0.1-0.3 parts foaming agent, and 0.2-0.4 parts crosslinking agent;

[0010] Preparation method of non-asbestos fiber rubber gaskets:

[0011] S1. Heat the rubber masterbatch using a heating and stirring device, and continue stirring it until it is completely melted to obtain mixed material A;

[0012] S2. Add non-asbestos fiber, accelerator, antioxidant, vulcanizing agent, foaming agent and crosslinking agent to the mixture A, and continue stirring until foaming and crosslinking are completed, then stop stirring to obtain mixture B.

[0013] S3. The obtained mixed material B is extruded through a hot extruder to obtain a sheet-like gasket body, and trapezoidal protrusions, trapezoidal grooves, and round protrusions are on the upper and lower surfaces of the gasket body.

[0014] S4. Feed the obtained gasket body into a punching machine and punch out a non-penetrating groove in its trapezoidal groove.

[0015] S5. The perforated gasket body is fed into a CNC machine tool, cut into a circle, and a circular hole is made in the circular gasket body to obtain a non-asbestos fiber rubber gasket.

[0016] Preferably, the rubber masterbatch includes ammonia rubber masterbatch, isoprene rubber masterbatch, styrene-butadiene rubber masterbatch, butadiene rubber masterbatch, silicone rubber masterbatch, and nitrile rubber masterbatch, and their mass ratio is 0.3-0.4:0.2-0.3:0.15-0.2:0.05-0.1:0.15-0.2:0.15-0.25.

[0017] Preferably, the non-asbestos fibers include carbon fibers, magnesia fibers, aramid fibers, pulp fibers, phenolic fibers, and polyacrylonitrile pre-oxidized filament fibers, with a mass ratio of 0.1-0.2:0.1-0.15:0.15-0.2:0.2-0.25:0.2-0.25:0.2-0.3.

[0018] Preferably, the accelerator is a phenolic resin.

[0019] Preferably, the antioxidant is zinc dibutyldithiocarbamate and nickel dibutyldithiocarbamate, and their mass ratio is 0.7-1:0.3-0.5.

[0020] Preferably, the foaming agent is azobisisobutyronitrile.

[0021] Preferably, the crosslinking agent is trimethylolpropane trimethacrylate and zinc acrylate, with a mass ratio of 0.3-0.5:0.7-1.

[0022] Preferably, in step S1, the heating temperature is 150-170°C, and the stirring speed is 20-30 revolutions per minute.

[0023] Preferably, in step S2, the vulcanization temperature is 130-150℃, the vulcanization pressure is 5-7MPa, and the vulcanization time is 15-20min.

[0024] (III) Beneficial Effects

[0025] This invention provides a non-asbestos fiber rubber gasket for use in chemical plants. It has the following beneficial effects:

[0026] 1. This invention adds non-asbestos organic fibers and non-asbestos inorganic fibers to rubber masterbatch, promotes the fusion of rubber masterbatch with an accelerator, and adds non-asbestos organic fibers and non-asbestos inorganic fibers to the rubber masterbatch solution through foaming and cross-linking technology to form a cross-linking network. Finally, it forms a non-asbestos rubber gasket by extrusion after vulcanization. The various parts work together to make the non-asbestos rubber gasket have better mechanical properties and moderate hardness, thereby making its sealing effect better.

[0027] 2. This invention forms trapezoidal protrusions, trapezoidal grooves, and round protrusions on the surface of the non-asbestos rubber gasket during extrusion and punches non-penetrating grooves on the surface after extrusion and cooling, resulting in higher compression ratio and resilience. This allows for longer repeated use during pipeline maintenance and replacement, greatly improving its service life. Attached Figure Description

[0028] Figure 1 This is one of the three-dimensional schematic diagrams of the present invention;

[0029] Figure 2 This is a second perspective view of the present invention;

[0030] Figure 3 This is a schematic diagram of the front section of the present invention;

[0031] Figure 4 For the present invention Figure 3 Enlarged diagram of point A in the middle.

[0032] Among them, 1. Gasket body; 2. Trapezoidal protrusion; 3. Trapezoidal groove; 4. Circular protrusion; 5. Groove. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1:

[0035] like Figure 1-4As shown, this embodiment of the invention provides a non-asbestos fiber rubber gasket for chemical plants, including a gasket body 1. The upper and lower ends of the gasket body 1 are alternately distributed with trapezoidal protrusions 2 and trapezoidal grooves 3. Circular protrusions 4 are evenly distributed on the side of the trapezoidal protrusions 2 that are far apart from each other, and circular protrusions 4 are evenly distributed on the side of the trapezoidal grooves 3 that are far apart from each other.

[0036] The rubber material used in non-asbestos fiber rubber gaskets:

[0037] The gasket body 1 is made from the following raw materials in parts by weight: 8 parts rubber masterbatch, 1 part non-asbestos fiber, 0.2 parts accelerator, 0.2 parts antioxidant, 0.2 parts vulcanizing agent, 0.1 parts foaming agent, and 0.2 parts crosslinking agent;

[0038] Preparation method of non-asbestos fiber rubber gaskets:

[0039] S1. Heat the rubber masterbatch using a heating and stirring device, and continue stirring it until it is completely melted to obtain mixed material A;

[0040] S2. Add non-asbestos fiber, accelerator, antioxidant, vulcanizing agent, foaming agent and crosslinking agent to the mixture A, and continue stirring until foaming and crosslinking are completed, then stop stirring to obtain mixture B.

[0041] S3. The obtained mixed material B is extruded through a hot extruder to obtain a sheet-like gasket body 1, and trapezoidal protrusions 2, trapezoidal grooves 3, and round protrusions 4 are on the upper and lower surfaces of the gasket body 1.

[0042] S4. The obtained gasket body 1 is fed into a punching machine, and a non-penetrating groove 5 is punched out in its trapezoidal groove 3.

[0043] S5. The perforated gasket body 1 is fed into a CNC machine tool, cut into a circle, and a circular hole is made in the circular gasket body 1 to obtain a non-asbestos fiber rubber gasket.

[0044] Rubber masterbatches include ammonia rubber masterbatch, isoprene rubber masterbatch, styrene-butadiene rubber masterbatch, butadiene rubber masterbatch, silicone rubber masterbatch, and nitrile rubber masterbatch, with a mass ratio of 0.3:0.2:0.15:0.05:0.15:0.15.

[0045] Non-asbestos fibers include carbon fiber, magnesia fiber, aramid fiber, pulp fiber, phenolic fiber, and polyacrylonitrile pre-oxidized filament fiber, with a mass ratio of 0.1:0.1:0.15:0.2:0.2:0.2.

[0046] The accelerator is phenolic resin.

[0047] The antioxidants are zinc dibutyldithiocarbamate and nickel dibutyldithiocarbamate, with a mass ratio of 0.7:0.3.

[0048] The foaming agent is azobisisobutyronitrile.

[0049] The crosslinking agents are trimethylolpropane trimethacrylate and zinc acrylate, with a mass ratio of 0.3:0.7.

[0050] In S1, the heating temperature is 150°C, and the mixer speed is 20 revolutions per minute.

[0051] In S2, the vulcanization temperature is 130℃, the vulcanization pressure is 5MPa, and the vulcanization time is 15min.

[0052] Example 2:

[0053] like Figure 1-4 As shown, this embodiment of the invention provides a non-asbestos fiber rubber gasket for chemical plants, including a gasket body 1. The upper and lower ends of the gasket body 1 are alternately distributed with trapezoidal protrusions 2 and trapezoidal grooves 3. Circular protrusions 4 are evenly distributed on the side of the trapezoidal protrusions 2 that are far apart from each other, and circular protrusions 4 are evenly distributed on the side of the trapezoidal grooves 3 that are far apart from each other.

[0054] The rubber material used in non-asbestos fiber rubber gaskets:

[0055] The gasket body material 1 is made from the following raw materials in parts by weight: 10 parts rubber masterbatch, 2 parts non-asbestos fiber, 0.3 parts accelerator, 0.3 parts antioxidant, 0.4 parts vulcanizing agent, 0.1-0.3 parts foaming agent, and 0.4 parts crosslinking agent;

[0056] Preparation method of non-asbestos fiber rubber gaskets:

[0057] S1. Heat the rubber masterbatch using a heating and stirring device, and continue stirring it until it is completely melted to obtain mixed material A;

[0058] S2. Add non-asbestos fiber, accelerator, antioxidant, vulcanizing agent, foaming agent and crosslinking agent to the mixture A, and continue stirring until foaming and crosslinking are completed, then stop stirring to obtain mixture B.

[0059] S3. The obtained mixed material B is extruded through a hot extruder to obtain a sheet-like gasket body 1, and trapezoidal protrusions 2, trapezoidal grooves 3, and round protrusions 4 are on the upper and lower surfaces of the gasket body 1.

[0060] S4. The obtained gasket body 1 is fed into a punching machine, and a non-penetrating groove 5 is punched out in its trapezoidal groove 3.

[0061] S5. The perforated gasket body 1 is fed into a CNC machine tool, cut into a circle, and a circular hole is made in the circular gasket body 1 to obtain a non-asbestos fiber rubber gasket.

[0062] Rubber masterbatches include ammonia rubber masterbatch, isoprene rubber masterbatch, styrene-butadiene rubber masterbatch, butadiene rubber masterbatch, silicone rubber masterbatch, and nitrile rubber masterbatch, with a mass ratio of 0.4:0.3:0.2:0.1:0.2:0.25.

[0063] Non-asbestos fibers include carbon fiber, magnesia fiber, aramid fiber, pulp fiber, phenolic fiber, and polyacrylonitrile pre-oxidized filament fiber, with a mass ratio of 0.2:0.15:0.2:0.25:0.25:0.3.

[0064] The accelerator is phenolic resin.

[0065] The antioxidants are zinc dibutyldithiocarbamate and nickel dibutyldithiocarbamate, with a mass ratio of 1:0.5.

[0066] The foaming agent is azobisisobutyronitrile.

[0067] The crosslinking agents are trimethylolpropane trimethacrylate and zinc acrylate, with a mass ratio of 0.5:1.

[0068] In S1, the heating temperature is 170℃, and the stirring speed is 30 revolutions per minute.

[0069] In S2, the vulcanization temperature is 150℃, the vulcanization pressure is 7MPa, and the vulcanization time is 20min.

[0070] Example 3:

[0071] like Figure 1-4 As shown, this embodiment of the invention provides a non-asbestos fiber rubber gasket for chemical plants, including a gasket body 1. The upper and lower ends of the gasket body 1 are alternately distributed with trapezoidal protrusions 2 and trapezoidal grooves 3. Circular protrusions 4 are evenly distributed on the side of the trapezoidal protrusions 2 that are far apart from each other, and circular protrusions 4 are evenly distributed on the side of the trapezoidal grooves 3 that are far apart from each other.

[0072] The rubber material used in non-asbestos fiber rubber gaskets:

[0073] The gasket body 1 is made from the following raw materials in parts by weight: 8 parts rubber masterbatch, 1 part non-asbestos fiber, 0.2 parts accelerator, 0.2 parts antioxidant, 0.2 parts vulcanizing agent, 0.1 parts foaming agent, and 0.2 parts crosslinking agent;

[0074] Preparation method of non-asbestos fiber rubber gaskets:

[0075] S1. Heat the rubber masterbatch using a heating and stirring device, and continue stirring it until it is completely melted to obtain mixed material A;

[0076] S2. Add non-asbestos fiber, accelerator, antioxidant, vulcanizing agent, foaming agent and crosslinking agent to the mixture A, and continue stirring until foaming and crosslinking are completed, then stop stirring to obtain mixture B.

[0077] S3. The obtained mixed material B is extruded through a hot extruder to obtain a sheet-like gasket body 1, and trapezoidal protrusions 2, trapezoidal grooves 3, and round protrusions 4 are on the upper and lower surfaces of the gasket body 1.

[0078] S4. The obtained gasket body 1 is fed into a punching machine, and a non-penetrating groove 5 is punched out in its trapezoidal groove 3.

[0079] S5. The perforated gasket body 1 is fed into a CNC machine tool, cut into a circle, and a circular hole is made in the circular gasket body 1 to obtain a non-asbestos fiber rubber gasket.

[0080] Rubber masterbatches include ammonia rubber masterbatch, isoprene rubber masterbatch, styrene-butadiene rubber masterbatch, butadiene rubber masterbatch, silicone rubber masterbatch, and nitrile rubber masterbatch, with a mass ratio of 0.3:0.2:0.15:0.05:0.15:0.15.

[0081] Non-asbestos fibers include carbon fiber, magnesia fiber, aramid fiber, pulp fiber, phenolic fiber, and polyacrylonitrile pre-oxidized filament fiber, with a mass ratio of 0.1:0.1:0.15:0.2:0.2-0.25:0.2.

[0082] The accelerator is phenolic resin.

[0083] The antioxidants are zinc dibutyldithiocarbamate and nickel dibutyldithiocarbamate, with a mass ratio of 0.7:0.3.

[0084] The foaming agent is azobisisobutyronitrile.

[0085] The crosslinking agents are trimethylolpropane trimethacrylate and zinc acrylate, with a mass ratio of 0.3:0.7.

[0086] In S1, the heating temperature is 170℃, and the mixer speed is 30 revolutions per minute.

[0087] In S2, the vulcanization temperature is 150℃, the vulcanization pressure is 7MPa, and the vulcanization time is 20min.

[0088] Example 4:

[0089] like Figure 1-4As shown, this embodiment of the invention provides a non-asbestos fiber rubber gasket for chemical plants, including a gasket body 1. The upper and lower ends of the gasket body 1 are alternately distributed with trapezoidal protrusions 2 and trapezoidal grooves 3. Circular protrusions 4 are evenly distributed on the side of the trapezoidal protrusions 2 that are far apart from each other, and circular protrusions 4 are evenly distributed on the side of the trapezoidal grooves 3 that are far apart from each other.

[0090] The rubber material used in non-asbestos fiber rubber gaskets:

[0091] The gasket body 1 is made from the following raw materials in parts by weight: 10 parts rubber masterbatch, 2 parts non-asbestos fiber, 0.3 parts accelerator, 0.3 parts antioxidant, 0.4 parts vulcanizing agent, 0.3 parts foaming agent, and 0.4 parts crosslinking agent;

[0092] Preparation method of non-asbestos fiber rubber gaskets:

[0093] S1. Heat the rubber masterbatch using a heating and stirring device, and continue stirring it until it is completely melted to obtain mixed material A;

[0094] S2. Add non-asbestos fiber, accelerator, antioxidant, vulcanizing agent, foaming agent and crosslinking agent to the mixture A, and continue stirring until foaming and crosslinking are completed, then stop stirring to obtain mixture B.

[0095] S3. The obtained mixed material B is extruded through a hot extruder to obtain a sheet-like gasket body 1, and trapezoidal protrusions 2, trapezoidal grooves 3, and round protrusions 4 are on the upper and lower surfaces of the gasket body 1.

[0096] S4. The obtained gasket body 1 is fed into a punching machine, and a non-penetrating groove 5 is punched out in its trapezoidal groove 3.

[0097] S5. The perforated gasket body 1 is fed into a CNC machine tool, cut into a circle, and a circular hole is made in the circular gasket body 1 to obtain a non-asbestos fiber rubber gasket.

[0098] Rubber masterbatches include ammonia rubber masterbatch, isoprene rubber masterbatch, styrene-butadiene rubber masterbatch, butadiene rubber masterbatch, silicone rubber masterbatch, and nitrile rubber masterbatch, with a mass ratio of 0.4:0.3:0.2:0.1:0.2:0.25.

[0099] Non-asbestos fibers include carbon fiber, magnesia fiber, aramid fiber, pulp fiber, phenolic fiber, and polyacrylonitrile pre-oxidized filament fiber, with a mass ratio of 0.2:0.15:0.2:0.25:0.25:0.3.

[0100] The accelerator is phenolic resin.

[0101] The antioxidants are zinc dibutyldithiocarbamate and nickel dibutyldithiocarbamate, with a mass ratio of 1:0.5.

[0102] The foaming agent is azobisisobutyronitrile.

[0103] The crosslinking agents are trimethylolpropane trimethacrylate and zinc acrylate, with a mass ratio of 0.5:1.

[0104] In S1, the heating temperature is 150℃, and the stirring speed is 20 revolutions per minute.

[0105] In S2, the vulcanization temperature is 130℃, the vulcanization pressure is 5MPa, and the vulcanization time is 15min.

[0106] Example 5:

[0107] like Figure 1-4 As shown, this embodiment of the invention provides a non-asbestos fiber rubber gasket for chemical plants, including a gasket body 1. The upper and lower ends of the gasket body 1 are alternately distributed with trapezoidal protrusions 2 and trapezoidal grooves 3. Circular protrusions 4 are evenly distributed on the side of the trapezoidal protrusions 2 that are far apart from each other, and circular protrusions 4 are evenly distributed on the side of the trapezoidal grooves 3 that are far apart from each other.

[0108] The rubber material used in non-asbestos fiber rubber gaskets:

[0109] The gasket body material 1 is made from the following raw materials in parts by weight: 9 parts rubber masterbatch, 1.5 parts non-asbestos fiber, 0.25 parts accelerator, 0.25 parts antioxidant, 0.3 parts vulcanizing agent, 0.2 parts foaming agent, and 0.3 parts crosslinking agent;

[0110] Preparation method of non-asbestos fiber rubber gaskets:

[0111] S1. Heat the rubber masterbatch using a heating and stirring device, and continue stirring it until it is completely melted to obtain mixed material A;

[0112] S2. Add non-asbestos fiber, accelerator, antioxidant, vulcanizing agent, foaming agent and crosslinking agent to the mixture A, and continue stirring until foaming and crosslinking are completed, then stop stirring to obtain mixture B.

[0113] S3. The obtained mixed material B is extruded through a hot extruder to obtain a sheet-like gasket body 1, and trapezoidal protrusions 2, trapezoidal grooves 3, and round protrusions 4 are on the upper and lower surfaces of the gasket body 1.

[0114] S4. The obtained gasket body 1 is fed into a punching machine, and a non-penetrating groove 5 is punched out in its trapezoidal groove 3.

[0115] S5. The perforated gasket body 1 is fed into a CNC machine tool, cut into a circle, and a circular hole is made in the circular gasket body 1 to obtain a non-asbestos fiber rubber gasket.

[0116] Rubber masterbatches include ammonia rubber masterbatch, isoprene rubber masterbatch, styrene-butadiene rubber masterbatch, butadiene rubber masterbatch, silicone rubber masterbatch, and nitrile rubber masterbatch, with a mass ratio of 0.35:0.25:0.18:0.07:0.18:0.2.

[0117] Non-asbestos fibers include carbon fiber, magnesia fiber, aramid fiber, pulp fiber, phenolic fiber, and polyacrylonitrile pre-oxidized filament fiber, with a mass ratio of 0.15:0.13:0.17:0.23:0.23:0.25.

[0118] The accelerator is phenolic resin.

[0119] The antioxidants are zinc dibutyldithiocarbamate and nickel dibutyldithiocarbamate, with a mass ratio of 0.8:0.4.

[0120] The foaming agent is azobisisobutyronitrile.

[0121] The crosslinking agents are trimethylolpropane trimethacrylate and zinc acrylate, with a mass ratio of 0.4:0.8.

[0122] In S1, the heating temperature is 60℃, and the stirring speed is 25 revolutions per minute.

[0123] In S2, the vulcanization temperature is 140℃, the vulcanization pressure is 6MPa, and the vulcanization time is 17min.

[0124] Example 6:

[0125] like Figure 1-4 As shown, this embodiment of the invention provides a non-asbestos fiber rubber gasket for chemical plants, including a gasket body 1. The upper and lower ends of the gasket body 1 are alternately distributed with trapezoidal protrusions 2 and trapezoidal grooves 3. Circular protrusions 4 are evenly distributed on the side of the trapezoidal protrusions 2 that are far apart from each other, and circular protrusions 4 are evenly distributed on the side of the trapezoidal grooves 3 that are far apart from each other.

[0126] The rubber material used in non-asbestos fiber rubber gaskets:

[0127] The gasket body material 1 is made from the following raw materials in parts by weight: 9 parts rubber masterbatch, 1.5 parts non-asbestos fiber, 0.25 parts accelerator, 0.25 parts antioxidant, 0.3 parts vulcanizing agent, 0.2 parts foaming agent, and 0.3 parts crosslinking agent;

[0128] Preparation method of non-asbestos fiber rubber gaskets:

[0129] S1. Heat the rubber masterbatch using a heating and stirring device, and continue stirring it until it is completely melted to obtain mixed material A;

[0130] S2. Add non-asbestos fiber, accelerator, antioxidant, vulcanizing agent, foaming agent and crosslinking agent to the mixture A, and continue stirring until foaming and crosslinking are completed, then stop stirring to obtain mixture B.

[0131] S3. The obtained mixed material B is extruded through a hot extruder to obtain a sheet-like gasket body 1, and trapezoidal protrusions 2, trapezoidal grooves 3, and round protrusions 4 are on the upper and lower surfaces of the gasket body 1.

[0132] S4. The obtained gasket body 1 is fed into a punching machine, and a non-penetrating groove 5 is punched out in its trapezoidal groove 3.

[0133] S5. The perforated gasket body 1 is fed into a CNC machine tool, cut into a circle, and a circular hole is made in the circular gasket body 1 to obtain a non-asbestos fiber rubber gasket.

[0134] Rubber masterbatches include ammonia rubber masterbatch, isoprene rubber masterbatch, styrene-butadiene rubber masterbatch, butadiene rubber masterbatch, silicone rubber masterbatch, and nitrile rubber masterbatch, with a mass ratio of 0.35:0.25:0.18:0.07:0.18:0.2.

[0135] Non-asbestos fibers include carbon fiber, magnesia fiber, aramid fiber, pulp fiber, phenolic fiber, and polyacrylonitrile pre-oxidized filament fiber, with a mass ratio of 0.15:0.13:0.17:0.23:0.23:0.25.

[0136] The accelerator is phenolic resin.

[0137] The antioxidants are zinc dibutyldithiocarbamate and nickel dibutyldithiocarbamate, with a mass ratio of 0.8:0.4.

[0138] The foaming agent is azobisisobutyronitrile.

[0139] The crosslinking agents are trimethylolpropane trimethacrylate and zinc acrylate, with a mass ratio of 0.4:0.8.

[0140] In S1, the heating temperature is 150℃, and the stirring speed is 30 revolutions per minute.

[0141] In S2, the vulcanization temperature is 150℃, the vulcanization pressure is 7MPa, and the vulcanization time is 20min.

[0142] Example 7:

[0143] like Figure 1-4As shown, this embodiment of the invention provides a non-asbestos fiber rubber gasket for chemical plants, including a gasket body 1. The upper and lower ends of the gasket body 1 are alternately distributed with trapezoidal protrusions 2 and trapezoidal grooves 3. Circular protrusions 4 are evenly distributed on the side of the trapezoidal protrusions 2 that are far apart from each other, and circular protrusions 4 are evenly distributed on the side of the trapezoidal grooves 3 that are far apart from each other.

[0144] The rubber material used in non-asbestos fiber rubber gaskets:

[0145] The gasket body material 1 is made from the following raw materials in parts by weight: 9 parts rubber masterbatch, 1.5 parts non-asbestos fiber, 0.25 parts accelerator, 0.25 parts antioxidant, 0.3 parts vulcanizing agent, 0.2 parts foaming agent, and 0.3 parts crosslinking agent;

[0146] Preparation method of non-asbestos fiber rubber gaskets:

[0147] S1. Heat the rubber masterbatch using a heating and stirring device, and continue stirring it until it is completely melted to obtain mixed material A;

[0148] S2. Add non-asbestos fiber, accelerator, antioxidant, vulcanizing agent, foaming agent and crosslinking agent to the mixture A, and continue stirring until foaming and crosslinking are completed, then stop stirring to obtain mixture B.

[0149] S3. The obtained mixed material B is extruded through a hot extruder to obtain a sheet-like gasket body 1, and trapezoidal protrusions 2, trapezoidal grooves 3, and round protrusions 4 are on the upper and lower surfaces of the gasket body 1.

[0150] S4. The obtained gasket body 1 is fed into a punching machine, and a non-penetrating groove 5 is punched out in its trapezoidal groove 3.

[0151] S5. The perforated gasket body 1 is fed into a CNC machine tool, cut into a circle, and a circular hole is made in the circular gasket body 1 to obtain a non-asbestos fiber rubber gasket.

[0152] Rubber masterbatches include ammonia rubber masterbatch, isoprene rubber masterbatch, styrene-butadiene rubber masterbatch, butadiene rubber masterbatch, silicone rubber masterbatch, and nitrile rubber masterbatch, with a mass ratio of 0.35:0.25:0.18:0.07:0.18:0.2.

[0153] Non-asbestos fibers include carbon fiber, magnesia fiber, aramid fiber, pulp fiber, phenolic fiber, and polyacrylonitrile pre-oxidized filament fiber, with a mass ratio of 0.15:0.13:0.17:0.23:0.23:0.25.

[0154] The accelerator is phenolic resin.

[0155] The antioxidants are zinc dibutyldithiocarbamate and nickel dibutyldithiocarbamate, with a mass ratio of 0.8:0.4.

[0156] The foaming agent is azobisisobutyronitrile.

[0157] The crosslinking agents are trimethylolpropane trimethacrylate and zinc acrylate, with a mass ratio of 0.4:0.8.

[0158] In S1, the heating temperature is 170℃, and the mixer speed is 30 revolutions per minute.

[0159] In S2, the vulcanization temperature is 150℃, the vulcanization pressure is 7MPa, and the vulcanization time is 20min.

[0160] Comparative Example 1:

[0161] like Figure 1-4 As shown, an embodiment of the present invention provides a non-asbestos fiber rubber gasket for chemical plants, including a gasket body 1;

[0162] The rubber material used in non-asbestos fiber rubber gaskets:

[0163] The gasket body 1 is made from the following raw materials in parts by weight: 8 parts rubber masterbatch, 1 part non-asbestos fiber, 0.2 parts accelerator, 0.2 parts antioxidant, 0.2 parts vulcanizing agent, 0.1 parts foaming agent, and 0.2 parts crosslinking agent;

[0164] Preparation method of non-asbestos fiber rubber gaskets:

[0165] S1. Heat the rubber masterbatch using a heating and stirring device, and continue stirring it until it is completely melted to obtain mixed material A;

[0166] S2. Add non-asbestos fiber, accelerator, antioxidant, vulcanizing agent, foaming agent and crosslinking agent to the mixture A, and continue stirring until foaming and crosslinking are completed, then stop stirring to obtain mixture B.

[0167] S3. The obtained mixed material B is extruded through a hot extruder to obtain a sheet-like gasket body 1.

[0168] S4. The perforated gasket body 1 is fed into a CNC machine tool, cut into a circle, and a circular hole is made in the circular gasket body 1 to obtain a non-asbestos fiber rubber gasket.

[0169] Rubber masterbatches include ammonia rubber masterbatch, isoprene rubber masterbatch, styrene-butadiene rubber masterbatch, butadiene rubber masterbatch, silicone rubber masterbatch, and nitrile rubber masterbatch, with a mass ratio of 0.3:0.2:0.15:0.05:0.15:0.15.

[0170] Non-asbestos fibers include carbon fiber, magnesia fiber, aramid fiber, pulp fiber, phenolic fiber, and polyacrylonitrile pre-oxidized filament fiber, with a mass ratio of 0.1:0.1:0.15:0.2:0.2:0.2.

[0171] The accelerator is phenolic resin.

[0172] The antioxidants are zinc dibutyldithiocarbamate and nickel dibutyldithiocarbamate, with a mass ratio of 0.7:0.3.

[0173] The foaming agent is azobisisobutyronitrile.

[0174] The crosslinking agents are trimethylolpropane trimethacrylate and zinc acrylate, with a mass ratio of 0.3:0.7.

[0175] In S1, the heating temperature is 150℃, and the stirring speed is 20 revolutions per minute.

[0176] In S2, the vulcanization temperature is 130℃, the vulcanization pressure is 5MPa, and the vulcanization time is 15min.

[0177] Comparative Example 2:

[0178] like Figure 1-4 As shown, this embodiment of the invention provides a non-asbestos fiber rubber gasket for chemical plants, including a gasket body 1. The upper and lower ends of the gasket body 1 are alternately distributed with trapezoidal protrusions 2 and trapezoidal grooves 3. Circular protrusions 4 are evenly distributed on the side of the trapezoidal protrusions 2 that are far apart from each other, and circular protrusions 4 are evenly distributed on the side of the trapezoidal grooves 3 that are far apart from each other.

[0179] The rubber material used in non-asbestos fiber rubber gaskets:

[0180] The gasket body material 1 is made from the following raw materials in parts by weight: 10 parts rubber masterbatch, 2 parts non-asbestos fiber, 0.3 parts accelerator, 0.3 parts antioxidant, 0.4 parts vulcanizing agent, 0.1-0.3 parts foaming agent, and 0.4 parts crosslinking agent;

[0181] Preparation method of non-asbestos fiber rubber gaskets:

[0182] S1. Heat the rubber masterbatch using a heating and stirring device, and continue stirring it until it is completely melted to obtain mixed material A;

[0183] S2. Add non-asbestos fiber, accelerator, antioxidant, vulcanizing agent, foaming agent and crosslinking agent to the mixture A, and continue stirring until foaming and crosslinking are completed, then stop stirring to obtain mixture B.

[0184] S3. The obtained mixed material B is extruded through a hot extruder to obtain a sheet-like gasket body 1, and trapezoidal protrusions 2, trapezoidal grooves 3, and round protrusions 4 are on the upper and lower surfaces of the gasket body 1.

[0185] S4. The obtained gasket body 1 is fed into a punching machine, and a non-penetrating groove 5 is punched out in its trapezoidal groove 3.

[0186] S5. The perforated gasket body 1 is fed into a CNC machine tool, cut into a circle, and a circular hole is made in the circular gasket body 1 to obtain a non-asbestos fiber rubber gasket.

[0187] Rubber masterbatches include ammonia rubber masterbatch, isoprene rubber masterbatch, styrene-butadiene rubber masterbatch, butadiene rubber masterbatch, silicone rubber masterbatch, and nitrile rubber masterbatch, with a mass ratio of 0.4:0.3:0.2:0.1:0.2:0.25.

[0188] Non-asbestos fibers include aramid fibers, pulp fibers, phenolic fibers, and polyacrylonitrile pre-oxidized filament fibers, with a mass ratio of 0.25:0.25:0.3.

[0189] The accelerator is phenolic resin.

[0190] The antioxidant is zinc dibutyldithiocarbamate.

[0191] The foaming agent is azobisisobutyronitrile.

[0192] The crosslinking agent is trimethylolpropane trimethacrylate.

[0193] In S1, the heating temperature is 170℃, and the mixer speed is 30 revolutions per minute.

[0194] In S2, the vulcanization temperature is 150℃, the vulcanization pressure is 7MPa, and the vulcanization time is 20min.

[0195] Comparative Example 3:

[0196] like Figure 1-4 As shown, this embodiment of the invention provides a non-asbestos fiber rubber gasket for chemical plants, including a gasket body 1. The upper and lower ends of the gasket body 1 are alternately distributed with trapezoidal protrusions 2 and trapezoidal grooves 3. Circular protrusions 4 are evenly distributed on the side of the trapezoidal protrusions 2 that are far apart from each other, and circular protrusions 4 are evenly distributed on the side of the trapezoidal grooves 3 that are far apart from each other.

[0197] The rubber material used in non-asbestos fiber rubber gaskets:

[0198] The gasket body material 1 is made from the following raw materials in parts by weight: 10 parts rubber masterbatch, 2 parts non-asbestos fiber, 0.3 parts accelerator, 0.3 parts antioxidant, 0.4 parts vulcanizing agent, 0.1-0.3 parts foaming agent, and 0.4 parts crosslinking agent;

[0199] Preparation method of non-asbestos fiber rubber gaskets:

[0200] S1. Heat the rubber masterbatch using a heating and stirring device, and continue stirring it until it is completely melted to obtain mixed material A;

[0201] S2. Add non-asbestos fiber, accelerator, antioxidant, vulcanizing agent, foaming agent and crosslinking agent to the mixture A, and continue stirring until foaming and crosslinking are completed, then stop stirring to obtain mixture B.

[0202] S3. The obtained mixed material B is extruded through a hot extruder to obtain a sheet-like gasket body 1, and trapezoidal protrusions 2, trapezoidal grooves 3, and round protrusions 4 are on the upper and lower surfaces of the gasket body 1.

[0203] S4. The obtained gasket body 1 is fed into a punching machine, and a non-penetrating groove 5 is punched out in its trapezoidal groove 3.

[0204] S5. The perforated gasket body 1 is fed into a CNC machine tool, cut into a circle, and a circular hole is made in the circular gasket body 1 to obtain a non-asbestos fiber rubber gasket.

[0205] Rubber masterbatches include ammonia rubber masterbatch, isoprene rubber masterbatch, styrene-butadiene rubber masterbatch, butadiene rubber masterbatch, silicone rubber masterbatch, and nitrile rubber masterbatch, with a mass ratio of 0.4:0.3:0.2:0.1:0.2:0.25.

[0206] Non-asbestos fibers include carbon fiber and magnesia fiber, with a mass ratio of 0.2:0.15.

[0207] The accelerator is phenolic resin.

[0208] The antioxidant is nickel dibutyldithiocarbamate.

[0209] The foaming agent is azobisisobutyronitrile.

[0210] The crosslinking agent is zinc acrylate, and their mass ratio is 1.

[0211] In S1, the heating temperature is 170℃, and the mixer speed is 30 revolutions per minute.

[0212] In S2, the vulcanization temperature is 150℃, the vulcanization pressure is 7MPa, and the vulcanization time is 20min.

[0213] Table 1 shows the physical performance parameters of the rubber gaskets obtained in each embodiment and comparative example.

[0214]

[0215] Table 1

[0216] As shown in Table 1, the non-asbestos fiber rubber gaskets provided in Examples 1, 2, and 3 have a higher compression rate and resilience rate compared to the non-asbestos fiber rubber gaskets provided in Comparative Examples 1, 2, and 3. This indicates that they have better compression and resilience effects and a longer service life. Furthermore, the non-asbestos fiber rubber gaskets provided in Examples 1, 2, and 3 have higher tear resistance than the non-asbestos fiber rubber gaskets provided in Comparative Examples 1, 2, and 3, and their hardness is moderate, indicating that they have better sealing effects and improved mechanical properties.

[0217] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A non-asbestos fiber rubber gasket for use in chemical plants, comprising a gasket body (1), characterized in that: The upper and lower ends of the gasket body (1) are alternately distributed with trapezoidal protrusions (2) and trapezoidal grooves (3). The trapezoidal protrusions (2) are evenly distributed with round protrusions (4) on the opposite side. The trapezoidal grooves (3) are evenly provided with round protrusions (4) on the opposite side. The rubber material used in non-asbestos fiber rubber gaskets: The gasket body (1) is made from the following raw materials in parts by weight: 8-10 parts rubber masterbatch, 1-2 parts non-asbestos fiber, 0.2-0.3 parts accelerator, 0.2-0.3 parts antioxidant, 0.2-0.4 parts vulcanizing agent, 0.1-0.3 parts foaming agent, and 0.2-0.4 parts crosslinking agent; Preparation method of non-asbestos fiber rubber gaskets: S1. Heat the rubber masterbatch using a heating and stirring device, and continue stirring it until it is completely melted to obtain mixed material A; S2. Add non-asbestos fiber, accelerator, antioxidant, vulcanizing agent, foaming agent and crosslinking agent to the mixture A, and continue stirring until foaming and crosslinking are completed, then stop stirring to obtain mixture B. S3. The obtained mixed material B is extruded through a hot extruder to obtain a sheet-like gasket body (1), and there are trapezoidal protrusions (2), trapezoidal grooves (3), and round protrusions (4) on the upper and lower surfaces of the gasket body (1). S4. The obtained gasket body (1) is fed into a punching machine, and a non-penetrating groove (5) is punched out in its trapezoidal groove (3); S5. The perforated gasket body (1) is fed into a CNC machine tool, cut into a circle, and a circular hole is made in the circular gasket body (1) to obtain a non-asbestos fiber rubber gasket.

2. A non-asbestos fiber rubber gasket for use in chemical plants according to claim 1, characterized in that: The rubber masterbatch includes ammonia rubber masterbatch, isoprene rubber masterbatch, styrene-butadiene rubber masterbatch, butadiene rubber masterbatch, silicone rubber masterbatch, and nitrile rubber masterbatch, with a mass ratio of 0.3-0.4:0.2-0.3:0.15-0.2:0.05-0.1:0.15-0.2:0.15-0.

25.

3. A non-asbestos fiber rubber gasket for use in chemical plants according to claim 1, characterized in that: The non-asbestos fibers include carbon fiber, magnesia fiber, aramid fiber, pulp fiber, phenolic fiber, and polyacrylonitrile pre-oxidized filament fiber, with a mass ratio of 0.1-0.2:0.1-0.15:0.15-0.2:0.2-0.25:0.2-0.25:0.2-0.

3.

4. The non-asbestos fiber rubber gasket for chemical plants according to claim 1, characterized in that: The accelerator is phenolic resin.

5. A non-asbestos fiber rubber gasket for chemical plants according to claim 1, characterized in that: The antioxidant is zinc dibutyldithiocarbamate and nickel dibutyldithiocarbamate, with a mass ratio of 0.7-1:0.3-0.

5.

6. A non-asbestos fiber rubber gasket for chemical plants according to claim 1, characterized in that: The foaming agent is azobisisobutyronitrile.

7. A non-asbestos fiber rubber gasket for chemical plants according to claim 1, characterized in that: The crosslinking agent is trimethylolpropane trimethacrylate and zinc acrylate, with a mass ratio of 0.3-0.5:0.7-1.

8. A non-asbestos fiber rubber gasket for chemical plants according to claim 1, characterized in that: In step S1, the heating temperature is 150-170℃, and the stirring speed is 20-30 revolutions per minute.

9. A non-asbestos fiber rubber gasket for chemical plants according to claim 1, characterized in that: In S2, the vulcanization temperature is 130-150℃, the vulcanization pressure is 5-7MPa, and the vulcanization time is 15-20min.

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