Tensile flame-retardant rubber plate and preparation method thereof
By using neoprene, nitrile rubber and other materials in flame retardant rubber sheets, and adding basalt fibers, aluminum silicate fibers and modifiers, the problem of insufficient tensile and wear resistance of flame retardant rubber sheets is solved, and higher tensile and wear resistance and wear resistance are achieved, and the service life is extended.
Patent Information
- Application Number
- CN202411831595.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-03-07
AI Technical Summary
The tensile and wear resistance of existing flame retardant rubber plates are insufficient, and they cannot withstand frequent deformation and damage under complex working conditions, which affects their service life.
Rubber plates are prepared by vulcanization treatment using neoprene, nitrile rubber, acrylonitrile-butadiene-styrene copolymer, inorganic fibers and flame retardants, and basalt fibers and aluminum silicate fibers, as well as modifiers such as carbon nanotubes and silicon carbide to improve the structural stability of the rubber plate.
The tensile and wear resistance of flame retardant rubber sheets is significantly improved, allowing them to maintain stable performance under high tensile stress and friction conditions, extend service life and reduce maintenance costs.
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Abstract
Description
Technical Field
[0001] The invention relates to the technical field of rubber plates, and in particular to a tensile flame-retardant rubber plate and a preparation method thereof. Background Art
[0002] Rubber sheet is a sheet product with a certain thickness and large area made of rubber as the main material through vulcanization. It usually has excellent rebound, oil resistance and weather resistance. Flame retardant rubber sheet is a rubber sheet with flame retardant properties. It is mainly made of natural rubber or synthetic rubber as the main material, with various flame retardants and other additives added, and processed through a specific process. After reaching the ignition point, it can delay the combustion process and reduce the flame propagation speed. It can play a good fire prevention role in high temperature and flammable environments. Therefore, it can be used in fire prevention, explosion prevention, anti-slip and other aspects of buildings.
[0003] In addition to its flame retardant properties, flame retardant rubber sheets may be subjected to various tensile forces during use, such as in seals, conveyor belts and other applications, which require a certain amount of tensile stress. Good tensile resistance can ensure that the rubber sheet will not easily break or deform after being subjected to force, maintain the integrity of the structure, and thus ensure the normal performance of its sealing, connection and other functions. Furthermore, in the use of industrial production, construction and other fields, flame retardant rubber sheets will contact and generate friction with various objects, such as in conveying equipment, stairs and other parts. Good wear resistance can reduce the problems of thickness reduction and surface damage caused by wear of rubber sheets, extend their service life, reduce the frequency of replacement, and reduce maintenance costs. Therefore, good tensile resistance and wear resistance are important factors to ensure that flame retardant rubber sheets can maintain stable performance during long-term use.
[0004] However, although the existing flame retardant rubber sheet has certain tensile and wear resistance, its performance still needs to be improved. In some complex working conditions that require higher tensile and wear resistance, the current flame retardant rubber sheet may not be able to withstand frequent deformation and damage, thus affecting its service life. Therefore, improving the tensile and wear resistance of flame retardant rubber sheets is a key technical issue that needs to be solved urgently. Summary of the invention
[0005] The invention provides a tensile flame-retardant rubber sheet and a preparation method thereof, which solves the problems of poor tensile performance and poor wear resistance of the flame-retardant rubber sheet in the related art.
[0006] The technical solution of the present invention is as follows: The present invention provides a tensile flame-retardant rubber sheet, comprising the following components in parts by weight: 30-40 parts of chloroprene rubber, 15-20 parts of nitrile rubber, 8-16 parts of acrylonitrile-butadiene-styrene copolymer, 50-60 parts of flame retardant, 1-1.5 parts of vulcanizing agent, 0.4-0.8 parts of accelerator, 15-25 parts of inorganic fiber; The inorganic fibers include basalt fibers and aluminum silicate fibers; The weight ratio of the basalt fiber to the aluminum silicate fiber is 1:19-19:1.
[0007] As a further technical solution, the weight ratio of the basalt fiber to the aluminum silicate fiber is 3~8:2.
[0008] When the weight ratio of basalt fiber to aluminum silicate fiber is 3-8:2, the tensile properties and wear resistance of the flame retardant rubber sheet can be further improved.
[0009] As a further technical solution, the inorganic fiber is a modified inorganic fiber, and the modified inorganic fiber is obtained by modifying the inorganic fiber with a modifier.
[0010] As a further technical solution, the modifier includes carbon nanotubes.
[0011] When the modifier is carbon nanotubes, the inorganic fibers are modified by carbon nanotubes so that the inorganic fibers can be evenly dispersed in the rubber matrix material, so that they can be better filled in the internal structure of the rubber sheet, thereby improving the structural stability of the flame retardant rubber sheet, thereby further improving the tensile and wear resistance of the flame retardant rubber sheet.
[0012] As a further technical solution, the weight ratio of the inorganic fiber to the modifier is 20:1~3.
[0013] When the weight ratio of inorganic fiber to modifier is 20:1~3, the tensile properties and wear resistance of the flame retardant rubber sheet can be further improved.
[0014] As a further technical solution, the preparation method of the modified inorganic fiber comprises the following steps: dispersing the inorganic fiber and the modifier in a polyethylene glycol solution, drying, calcining, and crushing to obtain the modified inorganic fiber.
[0015] After the modifier and the inorganic fiber are dispersed in the polyethylene glycol solution, the modifier and the inorganic fiber can be effectively combined through calcination, thereby realizing the modification of the inorganic fiber by the modifier.
[0016] As a further technical solution, the mass fraction of the polyethylene glycol solution is 15% to 24%.
[0017] As a further technical solution, the weight ratio of the inorganic fiber to the polyethylene glycol solution is 1:1.25~1.35.
[0018] As a further technical solution, the modifier further includes silicon carbide, and the weight ratio of the carbon nanotubes to the silicon carbide is 1-5:1.
[0019] When the modifier also includes silicon carbide, the inorganic fibers are modified together with silicon carbide and carbon nanotubes, which can further improve the tensile properties and wear resistance of the flame retardant rubber sheet. The reason may be that the addition of silicon carbide can improve the modification effect of carbon nanotubes on inorganic fibers, thereby further improving the interaction between inorganic fibers and other components in the matrix, thereby further improving the tensile properties and wear resistance of the flame retardant rubber sheet. Among them, by optimizing the weight ratio of carbon nanotubes and silicon carbide, it is found that when the weight ratio of carbon nanotubes and silicon carbide is 1~5:1, the modification effect of the modifier on the inorganic fibers can reach the best, thereby further improving the tensile properties and wear resistance of the flame retardant rubber sheet.
[0020] As a further technical solution, during the calcination, the temperature is 700-800°C and the time is 2-3 hours.
[0021] As a further technical solution, the flame retardant includes one or both of aluminum hydroxide and magnesium hydroxide; and / or The vulcanizing agent includes one or two of sulfur and dicumyl peroxide; and / or The accelerator includes one or more of accelerator H, accelerator D, and accelerator TMTD.
[0022] The present invention also provides a method for preparing the tensile flame-retardant rubber sheet, comprising the following steps: S1, after first mixing the chloroprene rubber, the nitrile rubber and the acrylonitrile-butadiene-styrene copolymer, adding the inorganic fiber, the flame retardant and the accelerator for second mixing, removing the glue, cooling, and obtaining a mixture; S2, mixing the mixture with the vulcanizing agent, and vulcanizing the mixture to obtain the tensile flame retardant rubber sheet.
[0023] As a further technical solution, in step S1, during the first mixing, the temperature is 120-130°C and the time is 15-25 minutes; during the second mixing, the temperature is 110-120°C and the time is 10-15 minutes.
[0024] As a further technical solution, in step S2, during the vulcanization treatment, the vulcanization temperature is 130-140° C., the vulcanization pressure is 15-20 MPa, and the vulcanization time is 10-20 min.
[0025] The working principle and beneficial effects of the present invention are: In the present invention, chloroprene rubber is used as a base material to prepare a rubber sheet, and nitrile rubber, acrylonitrile-butadiene-styrene copolymer, inorganic fiber and other additives are added at the same time, so that the flame retardant rubber sheet prepared has excellent tensile properties and performs well in terms of wear resistance. The inorganic fiber includes basalt fiber and aluminum silicate fiber, and the two inorganic fibers can be well filled in the flame retardant rubber sheet. Through the use of two different inorganic fibers, a dense structure can be formed inside the rubber sheet, thereby better maintaining the stability of the shape and size of the rubber sheet, reducing compression deformation, and thus significantly improving the tensile properties and wear resistance of the flame retardant rubber sheet. DETAILED DESCRIPTION
[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0027] In the following embodiments and comparative examples, the model of chloroprene rubber is SN232; the model of nitrile rubber is NBR1051; the model of acrylonitrile-butadiene-styrene copolymer is CF-610A; the diameter of basalt fiber is 14um and the length is 6mm; the diameter of aluminum silicate fiber is 200μm; the carbon nanotube is a single-walled carbon nanotube, model TF-210, with a tube diameter of 60nm and a tube length of 20μm; the particle size of silicon carbide is 400 mesh; and the particle size of aluminum hydroxide is 325 mesh.
[0028] Example 1 A tensile flame-retardant rubber sheet comprises the following components in parts by weight: 30 parts of chloroprene rubber, 15 parts of nitrile rubber, 8 parts of acrylonitrile-butadiene-styrene copolymer, 50 parts of aluminum hydroxide, 1 part of sulfur, 0.4 parts of accelerator D, 15 parts of inorganic fiber; The inorganic fibers include 0.75 parts of basalt fibers and 14.25 parts of aluminum silicate fibers; A method for preparing a tensile flame-retardant rubber sheet comprises the following steps: S1, mixing chloroprene rubber, nitrile rubber and acrylonitrile-butadiene-styrene copolymer at 120° C. for 25 min, adding inorganic fiber, aluminum hydroxide and accelerator D, mixing at 110° C. for 15 min, debonding, cooling, and obtaining a mixture; S2. Mix the mixture with a vulcanizing agent, and vulcanize at 130° C. and 15 MPa for 20 min to obtain a tensile flame-retardant rubber sheet.
[0029] Example 2 A tensile flame-retardant rubber sheet comprises the following components in parts by weight: 35 parts of chloroprene rubber, 18 parts of nitrile rubber, 12 parts of acrylonitrile-butadiene-styrene copolymer, 55 parts of aluminum hydroxide, 1.3 parts of sulfur, 0.6 parts of accelerator H, and 20 parts of inorganic fiber; The inorganic fibers include 10 parts of basalt fibers and 10 parts of aluminum silicate fibers; A method for preparing a tensile flame-retardant rubber sheet comprises the following steps: S1, mixing chloroprene rubber, nitrile rubber and acrylonitrile-butadiene-styrene copolymer at 125° C. for 20 min, adding inorganic fiber, aluminum hydroxide and accelerator H, mixing at 115° C. for 10 min, debonding, cooling, and obtaining a mixture; S2. Mix the mixture with sulfur, and vulcanize at 135° C. and 18 MPa for 15 min to obtain a tensile flame-retardant rubber sheet.
[0030] Example 3 A tensile flame-retardant rubber sheet comprises the following components in parts by weight: 40 parts of chloroprene rubber, 20 parts of nitrile rubber, 16 parts of acrylonitrile-butadiene-styrene copolymer, 60 parts of aluminum hydroxide, 1.5 parts of sulfur, 0.8 parts of accelerator TMTD, 25 parts of inorganic fiber; The inorganic fibers include 23.75 parts of basalt fibers and 1.25 parts of aluminum silicate fibers; A method for preparing a tensile flame-retardant rubber sheet comprises the following steps: S1, mixing chloroprene rubber, nitrile rubber and acrylonitrile-butadiene-styrene copolymer at 130° C. for 15 min, adding inorganic fiber, aluminum hydroxide and accelerator TMTD, mixing at 120° C. for 10 min, debonding, cooling, and obtaining a mixture; S2. Mix the mixture with sulfur, and vulcanize at 140° C. and 20 MPa for 10 min to obtain a tensile flame-retardant rubber sheet.
[0031] Example 4 The only difference between this embodiment and embodiment 2 is that in this embodiment, the inorganic fibers include 18 parts of basalt fibers and 2 parts of aluminum silicate fibers.
[0032] Example 5 The only difference between this embodiment and embodiment 2 is that in this embodiment, the inorganic fibers include 12 parts of basalt fibers and 8 parts of aluminum silicate fibers.
[0033] Example 6 The only difference between this embodiment and embodiment 2 is that in this embodiment, the inorganic fibers include 16 parts of basalt fibers and 4 parts of aluminum silicate fibers.
[0034] Example 7 The only difference between this embodiment and embodiment 6 is that in this embodiment, the inorganic fiber is a modified inorganic fiber, and its preparation method includes the following steps: 40 parts of inorganic fibers (wherein the weight ratio of basalt fiber and aluminum silicate fiber is 4:1) and 1 part of single-walled carbon nanotubes are dispersed in 50 parts of 24% polyethylene glycol solution by mass, dried, calcined at 750°C for 2.5 hours, and crushed to obtain modified inorganic fibers.
[0035] Example 8 The only difference between this embodiment and embodiment 7 is that in this embodiment, 8 parts of single-walled carbon nanotubes are added.
[0036] Example 9 The only difference between this embodiment and embodiment 7 is that in this embodiment, 2 parts of single-walled carbon nanotubes are added.
[0037] Example 10 The only difference between this embodiment and embodiment 7 is that in this embodiment, 6 parts of single-walled carbon nanotubes are added.
[0038] Embodiment 11 The only difference between this embodiment and Embodiment 10 is that in this embodiment, the inorganic fiber is a modified inorganic fiber, and its preparation method includes the following steps: 40 parts of inorganic fiber (wherein the weight ratio of basalt fiber and aluminum silicate fiber is 4:1), 2 parts of single-walled carbon nanotubes and 4 parts of silicon carbide are dispersed in 54 parts of 15% by mass polyethylene glycol solution, dried, calcined at 750°C for 2.5 hours, and crushed to obtain modified inorganic fiber.
[0039] Example 12 The only difference between this embodiment and embodiment 11 is that in this embodiment, 5.5 parts of single-walled carbon nanotubes and 0.5 parts of silicon carbide are added.
[0040] Embodiment 13 The only difference between this embodiment and embodiment 11 is that in this embodiment, 3 parts of single-walled carbon nanotubes and 3 parts of silicon carbide are added.
[0041] Embodiment 14 The only difference between this embodiment and embodiment 11 is that in this embodiment, 5 parts of single-walled carbon nanotubes and 1 part of silicon carbide are added.
[0042] Comparative Example 1 The only difference between this comparative example and Example 1 is that in this comparative example, the inorganic fiber includes only 15 parts of basalt fiber.
[0043] Comparative Example 2 The only difference between this comparative example and Example 1 is that in this comparative example, the inorganic fiber includes only 15 parts of aluminum silicate fiber.
[0044] Comparative Example 3 The only difference between this comparative example and Example 1 is that in this comparative example, no inorganic fiber is added.
[0045] Experimental Example 1 Flame retardant performance test The flame retardant rubber sheets prepared in Examples 1 to 3 were subjected to oxygen index tests according to the test method in GB / T 10707-2008 "Determination of Rubber Combustion Performance", wherein the sample size was 100 mm × 6.5 mm × 3 mm, and the burning time was 180 s. The test results are shown in Table 1 below: Table 1 Flame retardant performance test results of Examples 1 to 3
[0046] In Table 1, the oxygen index of the flame retardant rubber sheets of Examples 1 to 3 is greater than 40%, indicating that the flame retardant rubber sheets prepared in the present invention have excellent flame retardant properties.
[0047] Experimental Example 2 Tensile performance test The flame retardant rubber plates prepared in Examples 1 to 14 and Comparative Examples 1 to 3 were tested for tensile strength at break and elongation at break according to the test method in GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber", wherein the samples were prepared into dumbbell-shaped samples, the sample type was type 1, the test speed was 500 mm / min, and the test results were the average values of 3 samples. The test results are shown in Table 2 below.
[0048] Experimental Example 3 Wear resistance test The flame retardant rubber sheets prepared in Examples 1 to 14 and Comparative Examples 1 to 3 were subjected to abrasion test according to the test method in GB / T 1689-2014 "Determination of wear resistance of vulcanized rubber (using Akron abrasion tester)". The test results are shown in Table 2 below.
[0049] Table 2 Test results of tensile properties and wear resistance of Examples 1 to 14 and Comparative Examples 1 to 3
[0050] In Table 2, compared with comparative examples 1 to 3, the tensile strength at break and the elongation at break of Example 1 are significantly improved, and the abrasion loss is significantly reduced, indicating that when the inorganic fibers include basalt fibers and aluminum silicate fibers, the tensile properties and wear resistance of the flame retardant rubber sheet can be improved by using two different inorganic fibers in combination.
[0051] Compared with Examples 2 and 4, the tensile strength at break and the elongation at break of Examples 5 to 6 are increased, and the abrasion loss is reduced, indicating that when the weight ratio of basalt fiber to aluminum silicate fiber is 3 to 8:2, the tensile properties and wear resistance of the flame retardant rubber sheet can be further improved.
[0052] Compared with Example 6, the tensile strength at break and the elongation at break of Examples 7 to 10 are improved, and the wear amount is reduced, indicating that when the modifier is carbon nanotubes, the inorganic fibers are modified by carbon nanotubes, and the tensile properties and wear resistance of the flame retardant rubber sheet can be further improved. Among them, compared with Examples 7 to 8, the tensile strength at break and the elongation at break of Examples 9 to 10 are improved, and the wear amount is reduced, indicating that when the weight ratio of inorganic fibers to carbon nanotubes is 20:1 to 3, the tensile properties and wear resistance of the flame retardant rubber sheet can be further improved.
[0053] Compared with Example 10, the tensile strength at break and the elongation at break of Examples 11 to 14 are improved, and the wear amount is reduced, indicating that when the modifier also includes silicon carbide, the inorganic fiber is modified by silicon carbide and carbon nanotubes together, and the tensile properties and wear resistance of the flame retardant rubber sheet can be further improved. Among them, compared with Examples 11 to 12, the tensile strength at break and the elongation at break of Examples 13 to 14 are improved, and the wear amount is reduced, indicating that when the weight ratio of carbon nanotubes to silicon carbide is 1 to 5:1, the tensile properties and wear resistance of the flame retardant rubber sheet can be further improved.
[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A tensile flame retardant rubber sheet, characterized in that: The composition comprises the following components in parts by weight: 30-40 parts of chloroprene rubber, 15-20 parts of nitrile rubber, 8-16 parts of acrylonitrile-butadiene-styrene copolymer, 50-60 parts of flame retardant, 1-1.5 parts of vulcanizing agent, 0.4-0.8 parts of accelerator, 15-25 parts of inorganic fiber; The inorganic fibers include basalt fibers and aluminum silicate fibers; The weight ratio of the basalt fiber to the aluminum silicate fiber is 1:19-19:
1.
2. The tensile flame retardant rubber sheet according to claim 1, characterized in that: The weight ratio of the basalt fiber to the aluminum silicate fiber is 3-8:
2.
3. The tensile flame retardant rubber sheet according to claim 1, characterized in that: The inorganic fiber is a modified inorganic fiber, and the modified inorganic fiber is obtained by modifying the inorganic fiber with a modifier; the modifier includes carbon nanotubes.
4. The tensile flame retardant rubber sheet according to claim 3, characterized in that: The weight ratio of the inorganic fiber to the modifier is 20:1-3.
5. The tensile flame retardant rubber sheet according to claim 3, characterized in that: The preparation method of the modified inorganic fiber comprises the following steps: dispersing the inorganic fiber and the modifier in a polyethylene glycol solution, drying, calcining and crushing to obtain the modified inorganic fiber.
6. The tensile flame retardant rubber sheet according to claim 5, characterized in that: The mass fraction of the polyethylene glycol solution is 15% to 24%; The weight ratio of the inorganic fiber to the polyethylene glycol solution is 1:1.25-1.
35.
7. The tensile flame retardant rubber sheet according to claim 3, characterized in that: The modifier further comprises silicon carbide, and the weight ratio of the carbon nanotubes to the silicon carbide is 1-5:
1.
8. The tensile flame retardant rubber sheet according to claim 5, characterized in that: During the calcination, the temperature is 700-800° C. and the time is 2-3 hours.
9. The tensile flame retardant rubber sheet according to claim 1, characterized in that: The flame retardant comprises one or both of aluminum hydroxide and magnesium hydroxide; and / or The vulcanizing agent includes one or two of sulfur and dicumyl peroxide; and / or The accelerator includes one or more of accelerator H, accelerator D, and accelerator TMTD.
10. The method for preparing a tensile flame retardant rubber sheet according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, after first mixing the chloroprene rubber, the nitrile rubber and the acrylonitrile-butadiene-styrene copolymer, adding the inorganic fiber, the flame retardant and the accelerator for second mixing, removing the glue, cooling, and obtaining a mixture; S2, mixing the mixture with the vulcanizing agent, and vulcanizing the mixture to obtain the tensile flame retardant rubber sheet.