A flame retardant and anti-permeation rubber material and its preparation method and application

Abstract

The invention relates to the technical field of chemical protection materials, and in particular to a flame retardant and anti-permeation rubber material, a preparation method and an application thereof; the material comprises the following raw materials in proportion by weight: 100 parts of brominated butyl rubber, 10 to 25 parts of ethylene propylene rubber, 4.0 to 6.0 parts of zinc oxide, 1.0 to 2.0 parts of sulfur, 0.4 to 0.6 parts of accelerator TT, 1.5 to 2.0 parts of accelerator M, 0.4 to 0.5 parts of accelerator DM, 1.0 to 1.5 parts of stearic acid; 10 to 35 parts of antimony trioxide, 10 to 2 parts of chlorinated paraffin, and 10 to 3 parts of chlorinated paraffin. 0, 70-85 parts of zinc borate, and 10-20 parts of nano molybdenum disulfide; the present invention improves the phase capacity of the flame retardant in brominated butyl rubber by doping with highly flexible EPDM rubber, and replaces conventional plasticizers to ensure the consistency and density of components in various parts of the material; the flame retardant system design with an extraordinary amount of zinc borate as the main body has a critical point for the suppression of afterburning and smoldering, and a breakthrough effect of flame retardancy is achieved; through the synergistic effect of doping and the flame retardant system, the best combination of flame retardant performance and anti-penetration performance is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of chemical protection materials, and in particular to a flame retardant and anti-penetration rubber material and a preparation method and application thereof. Background Art

[0002] Bromobutyl rubber has become the preferred material for chemical protection products because of its strong resistance to chemical penetration. The bromine content of about 2% in bromobutyl rubber can decompose into non-flammable HBr when heated. Under the condition of open flame combustion, it can dilute the concentration of combustible gas produced by the degradation of bromobutyl rubber and reduce the intensity of combustion.

[0003] Compared with other halogen-free rubbers, bromobutyl rubber has the ability to inhibit combustion. However, due to its low content, compared with the vast majority of flammable C and H in the composition, its flame retardant effect is very weak. Therefore, for applications requiring flame retardancy, flame retardants must be added to achieve flame retardancy.

[0004] Apart from the spontaneous combustion caused by the chemical reaction of the material itself, combustion is caused by external fire sources. Once an open flame is formed, its combustion temperature is 800℃~1000℃, while the degradation temperature of brominated butyl rubber is 230℃~260℃. The fire source temperature is much higher than the degradation temperature of brominated butyl rubber. Therefore, a large amount of flame retardant must be added to obtain the desired flame retardant effect. However, the adverse effects caused by this cannot be ignored:

[0005] (1) The original flexibility of the material is greatly reduced, and the products made from it become rigid, and their use under low temperature conditions is limited.

[0006] The common method to solve this problem is to add plasticizers. Small molecule liquid plasticizers have the best effect, but due to their low molecular weight, poor stability, and easy precipitation at high temperatures, the pores formed during the precipitation process provide channels for chemical penetration, reducing the protection time. Moreover, most of these materials are flammable materials, which will weaken the flame retardant effect.

[0007] (2) Bromobutyl rubber has low compatibility with flame retardants. When the amount of flame retardant exceeds its maximum capacity, the flame retardant tends to migrate to the surface over time, especially at low temperatures, reducing the flame retardant content inside the material and weakening the flame retardant effect. At the same time, the pores formed by migration provide channels for the penetration of chemicals, reducing the protection time.

[0008] Especially during dynamic use, the flame retardant and brominated butyl rubber molecules may slip due to external forces, which may easily cause local voids or pores and reduce the protection time.

[0009] Therefore, solving the contradiction between flame retardancy, flexibility and anti-penetration performance and giving the material flame retardancy without reducing the flexibility and anti-penetration performance of the material is the key technology to improve the quality of materials and products. Summary of the invention

[0010] The present invention overcomes the deficiencies of the prior art and provides a flame retardant and anti-permeation rubber material. By doping EPDM rubber and designing a flame retardant system, the phase capacity of the flame retardant in the material is increased by means of the synergistic effect of the two, and the original flexibility and anti-permeation ability are maintained.

[0011] In order to solve the above technical problems, the technical solution adopted by the present invention is: a flame retardant and anti-permeation rubber material, characterized in that it includes the following raw materials in proportion by weight: 100 parts of brominated butyl rubber, 10 to 25 parts of EPDM rubber, 4.0 to 6.0 parts of zinc oxide, 1.0 to 2.0 parts of sulfur, 0.4 to 0.6 parts of accelerator TT, 1.5 to 2.0 parts of accelerator M, 0.4 to 0.5 parts of accelerator DM, 1.0 to 1.5 parts of stearic acid; 10 to 35 parts of antimony trioxide, 10 to 20 parts of chlorinated paraffin, 70 to 85 parts of zinc borate, and 10 to 20 parts of nano molybdenum disulfide.

[0012] The invention utilizes the characteristics of low saturation and many cavities of EPDM rubber, and provides more space positions for the flame retardant on the basis of the saturation amount of the flame retardant that the brominated butyl rubber can accommodate.

[0013] EPDM rubber and brominated butyl rubber are thermodynamically compatible systems. By taking advantage of the high elasticity, high flexibility and low resistance to molecular movement of EPDM rubber, a dynamic relationship is established between brominated butyl rubber, flame retardants and other necessary auxiliary agents, which increases the pores formed by molecular slippage caused by external forces, accelerates the elastic recovery of pores and different densities, and ensures the consistency and density of components in various parts of the material.

[0014] The flame retardant system is mainly composed of zinc borate in an extraordinary amount, combined with nano-molybdenum disulfide, antimony trioxide, and chlorinated paraffin. The necessary conditions for the formation of combustion are suppressed by cooling, diluting combustible gases, and diluting oxygen to achieve the purpose of flame retardancy.

[0015] When the dosage of zinc borate exceeds 70 parts, a critical point is reached in the inhibition of afterflaming and smoldering, and a breakthrough effect of flame retardancy is achieved.

[0016] Among them, chlorinated paraffin and nano-molybdenum disulfide are flame retardant, which can increase the speed at which the material responds to external forces and have a positive effect on ensuring the consistency and density of various components of the material.

[0017] The flame retardant system based on inorganic materials maintains the material's ability to prevent penetration by chemicals to the maximum extent, while being non-toxic and having little pollution to the environment.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The invention improves the phase capacity of the flame retardant in the brominated butyl rubber by doping the EPDM rubber with high flexibility, and replaces the conventional plasticizer to ensure the consistency and density of the components in various places inside the material.

[0020] The flame retardant system design with an extraordinary dosage of zinc borate as the main component has reached a critical point in the suppression of afterburning and smoldering, achieving a breakthrough effect in flame retardancy.

[0021] Through the synergistic effect of doping and flame retardant system, the best combination of flame retardant and anti-penetration properties is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a scanning electron microscope image of the surface of the flame retardant and anti-permeation rubber material obtained by the preparation method of the present invention.

[0023] Figure 2 This is a scanning electron microscope image of the surface of the flame retardant and anti-permeation rubber material that does not adopt the method of the present invention. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with specific embodiments.

[0025] Example 1

[0026] A flame retardant and anti-permeation rubber material comprises the following raw materials in proportion by mass: 100 parts of brominated butyl rubber, 15 parts of ethylene propylene rubber, 5.0 parts of zinc oxide, 1.5 parts of sulfur, 0.5 parts of accelerator TT, 1.5 parts of accelerator M, 0.4 parts of accelerator DM, 1.5 parts of stearic acid; 20 parts of antimony trioxide, 15 parts of chlorinated paraffin, 80 parts of zinc borate, 15 parts of nano molybdenum disulfide, a total of 255.4 parts.

[0027] The method for preparing the flame retardant and anti-permeation rubber material comprises the following steps: the first step: weighing, weighing various raw materials according to the proportion;

[0028] Step 2: Mixing, mixing process:

[0029] (1) Add brominated butyl rubber and EPDM rubber in proportion by mass, and plasticize with a roller distance of 0.8 mm;

[0030] (2) Add zinc oxide, stearic acid, chlorinated paraffin, and nano molybdenum disulfide and mix them with a roller distance of 1.2 mm;

[0031] (3) Add antimony trioxide and zinc borate and mix them with a roller distance of 1.2 mm;

[0032] (4) Add sulfur, accelerator TT, accelerator DM, and accelerator M, mix evenly, and the roller distance is 1.0 mm;

[0033] (5) Thin pass, roller distance 1.0mm;

[0034] (6) Produce the film.

[0035] Step 3: Molding.

[0036] Example 2

[0037] A flame retardant and anti-permeation rubber material comprises the following raw materials in proportion by mass: 100 parts of brominated butyl rubber, 15 parts of ethylene propylene rubber, 5.0 parts of zinc oxide, 1.5 parts of sulfur, 0.5 parts of accelerator TT, 1.5 parts of accelerator M, 0.4 parts of accelerator DM, 1.5 parts of stearic acid; 25 parts of antimony trioxide, 20 parts of chlorinated paraffin, 85 parts of zinc borate, and 15 parts of nano molybdenum disulfide; the total is 270.4 parts.

[0038] The preparation method of the flame retardant and anti-permeation rubber material is the same as that of Example 1.

[0039] Example 3

[0040] A flame retardant and anti-permeation rubber material comprises the following raw materials in proportion by mass: 100 parts of brominated butyl rubber, 20 parts of EPDM rubber, 5.0 parts of zinc oxide, 1.5 parts of sulfur, 0.5 parts of accelerator TT, 1.5 parts of accelerator M, 0.4 parts of accelerator DM, 1.5 parts of stearic acid; 25 parts of antimony trioxide, 15 parts of chlorinated paraffin, 80 parts of zinc borate, and 18 parts of nano molybdenum disulfide; the total is 268.4 parts.

[0041] The preparation method of the flame retardant and anti-permeation rubber material is the same as that of Example 1.

[0042] Example 4

[0043] A flame retardant and anti-permeation rubber material comprises the following raw materials in proportion by weight: 100 parts of brominated butyl rubber, 10 parts of ethylene propylene rubber, 6.0 parts of zinc oxide, 1.0 parts of sulfur, 0.4 parts of accelerator TT, 2.0 parts of accelerator M, 0.5 parts of accelerator DM, 1.0 parts of stearic acid; 10 parts of antimony trioxide, 20 parts of chlorinated paraffin, 70 parts of zinc borate, and 10 parts of nano molybdenum disulfide; the total is 230.9 parts.

[0044] The preparation method of the flame retardant and anti-permeation rubber material is the same as that of Example 1.

[0045] Example 5

[0046] A flame retardant and anti-permeation rubber material comprises the following raw materials in proportion by mass: 100 parts of brominated butyl rubber, 25 parts of EPDM rubber, 4.0 parts of zinc oxide, 2.0 parts of sulfur, 0.6 parts of accelerator TT, 2.0 parts of accelerator M, 0.5 parts of accelerator DM, 1.0 parts of stearic acid; 35 parts of antimony trioxide, 10 parts of chlorinated paraffin, 75 parts of zinc borate, and 20 parts of nano molybdenum disulfide; the total is 275.1 parts.

[0047] The preparation method of the flame retardant and anti-permeation rubber material is the same as that of Example 1.

[0048] The flame retardant and anti-permeation rubber materials prepared in Examples 1-3 were subjected to performance tests, and the performance evaluation results are as follows:

[0049]

[0050] Note: The specimen thickness is 0.38 mm.

[0051] The indicator requires that the sum of the afterburning and smoldering time should not exceed 15 seconds.

[0052] Figure 1 and attached Figure 2 They are scanning electron microscope images of the surface of the flame retardant and anti-permeation rubber material prepared by the present invention and the surface of the flame retardant and anti-permeation rubber material not prepared by the present invention.

[0053] Figure 1 The material surface is dense, crack-free and has strong protective capabilities.

[0054] Figure 2 There are defects such as cracks and pores on the surface of the material, which become channels for the penetration of toxic chemicals. Performance tests show that its protection time against sulfuric acid, sodium hydroxide, acetone and n-hexane is only 5 to 10 minutes, which makes it worthless.

Claims

1. A flame retardant and anti-permeability rubber material, It is characterized in that The invention comprises the following raw materials in proportion by weight: 100 parts of brominated butyl rubber, 10-25 parts of ethylene propylene rubber, 4.0-6.0 parts of zinc oxide, 1.0-2.0 parts of sulfur, 0.4-0.6 parts of accelerator TT, 1.5-2.0 parts of accelerator M, 0.4-0.5 parts of accelerator DM, 1.0-1.5 parts of stearic acid; 10-35 parts of antimony trioxide, 10-20 parts of chlorinated paraffin, 70-85 parts of zinc borate and 10-20 parts of nano molybdenum disulfide.

2. A method for preparing the flame retardant and anti-permeation rubber material according to claim 1, It is characterized in that The method comprises the following steps: the first step: weighing, weighing various raw materials according to the proportion; Step 2: Mixing, mixing process: (1) Add brominated butyl rubber and EPDM rubber in proportion by mass, and plasticize with a roller distance of 0.8 mm; (2) Add zinc oxide, stearic acid, chlorinated paraffin, and nano molybdenum disulfide and mix them with a roller distance of 1.2 mm; (3) Add antimony trioxide and zinc borate and mix them with a roller distance of 1.2 mm; (4) Add sulfur, accelerator TT, accelerator DM, and accelerator M, mix evenly, and the roller distance is 1.0 mm; (5) Thin pass, roller distance 1.0mm; (6) Film production; Step 3: Molding.

3. Use of the flame-retardant and anti-permeation rubber material as claimed in claim 1 in thin products such as adhesive tapes.

4. The use as claimed in claim 3, It is characterized in that The adhesive tape-like thin product is produced by a calendering or gluing process.

5. Use of the flame retardant and anti-permeation rubber material as claimed in claim 1 in the production of pure rubber products.

6. The use according to claim 5, It is characterized in that Pure rubber products are made by compression vulcanization process: the vulcanization temperature is 160℃, the vulcanization pressure is 10MPa, and the vulcanization time is 15min~20min.

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