Self-crosslinking flame-retardant ethylene propylene rubber self-adhesive tape and preparation method thereof

Abstract

The invention discloses a self-crosslinkable flame-retardant ethylene propylene rubber self-adhesive tape and a preparation method thereof. The self-crosslinkable flame-retardant ethylene propylene rubber self-adhesive tape comprises the following raw material components in parts by mass: 60-75 parts of ethylene propylene diene monomer, 10-30 parts of halogenated butyl rubber, 10-50 parts of a heat-resistant polymer, 3-12 parts of tackifying resin, 5-30 parts of operating oil, 100-150 parts of a flame-retardant filler and 6-15 parts of an auxiliary agent. The tackifying resin comprises one or more of alkyl phenolic resin and halogenated modified resin thereof, and aralkyl phenolic resin and halogenated modified resin thereof. The prepared adhesive tape is convenient to install, resin containing active groups is selected as tackifying resin for raw material components, on the basis that the adhesive tape has good viscosity, the adhesive tape can be slowly cross-linked in the using process (90 DEG C or above), and therefore the heat resistance and the aging resistance are improved; meanwhile, the heat-resistant polymer is added, so that the heat resistance in the preparation and use processes can be ensured; and a flame-retardant filler matched with the formula system is further added, so that the system has good flame retardance.

Description

Technical Field

[0001] The invention relates to the technical field of rubber materials, and in particular to a self-crosslinkable flame-retardant ethylene-propylene rubber self-adhesive tape and a preparation method thereof. Background Art

[0002] Ethylene propylene rubber self-adhesive tape is generally used for main insulation restoration of solid dielectric cables of 35kV and below, moisture-proof sealing of high and low voltage cables, sealing of intermediate joints and ends, waterproof sealing insulation of wire core connectors on medium and high voltage joints, and busbar insulation. The above application scenarios require the product to have good self-adhesion and electrical insulation, as well as good conformability and self-fusion to be suitable for stretching during use, to meet the cable overload characteristics and to have excellent weather resistance.

[0003] The EPDM self-adhesive tapes currently on the market are generally wound in multiple layers when used, and the layers are fused together to form an integrated insulating material. However, since this material is an unvulcanized rubber material, the product after winding will gradually lose its bonding strength and insulation performance after being exposed to sunlight for a long time, eroded by sea water, river water, and rainwater. Especially after long-term use, it is easy to cause serious aging of the product and serious degradation of performance. In addition, the existing EPDM self-adhesive tapes also have the problem of not being flame retardant or having poor flame retardancy.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present invention is to provide a self-crosslinkable flame-retardant EPDM self-adhesive tape and a preparation method thereof, aiming to solve the problems of poor aging resistance and non-flame retardancy of the existing EPDM self-adhesive tape without affecting the processability of the raw materials.

[0006] To achieve the above-mentioned purpose, the present invention provides a self-crosslinking flame-retardant EPDM rubber self-adhesive tape, wherein the self-crosslinking flame-retardant EPDM rubber self-adhesive tape has no crosslinking reaction during the preparation process, but undergoes a slow crosslinking reaction when the temperature reaches 90°C or above during use; the raw material components thereof include, by mass, 60-75 parts of EPDM rubber, 10-30 parts of halogenated butyl rubber, 10-50 parts of heat-resistant polymer, 3-12 parts of tackifying resin, 5-30 parts of operating oil, 100-150 parts of flame-retardant filler, and 6-15 parts of auxiliary agent; the tackifying resin includes one or more of alkylphenol-formaldehyde resin and halogenated modified resin thereof, and aralkylphenol-formaldehyde resin and halogenated modified resin thereof.

[0007] Optionally, when the ethylene content of the EPDM rubber is higher than 50%, the added amount of the tackifier resin is 8-12 parts; when the ethylene content of the EPDM rubber is 20%-50%, the added amount of the tackifier resin is 3-7 parts.

[0008] Optionally, the tackifying resin is one or more of butylphenol formaldehyde resin, tert-butylphenol formaldehyde resin, octylphenol formaldehyde resin, tert-octylphenol formaldehyde resin, tert-amylphenol formaldehyde resin, nonylphenol formaldehyde resin, and meta-brominated tert-octylphenol formaldehyde resin.

[0009] Optionally, the raw material components of the self-crosslinkable flame-retardant EPDM rubber self-adhesive tape further include a tackifier, and the mixing mass ratio of the tackifying resin to the tackifier is 1:(1-3).

[0010] Optionally, the heat-resistant polymer is a polymer with a melting point above 120°C or a polymer with a benzene ring in its molecular structure.

[0011] Optionally, the heat-resistant polymer is one or more of high-density polyethylene, polypropylene, nylon 6, and styrene-butadiene rubber.

[0012] Optionally, the flame-retardant filler is a mixture of two or three of decabromodiphenylethane, decabromodiphenyl ether, antimony trioxide, magnesium hydroxide, aluminum hydroxide, and LHX-999 flame retardant.

[0013] Optionally, the halogenated butyl rubber is one or two of brominated butyl rubber and chlorinated butyl rubber.

[0014] Optionally, the additives include a mixture of two or more of stearic acid, zinc stearate, antioxidant RD, antioxidant MB, and antioxidant 1010; the processing oil is one or two of naphthenic oil and paraffin oil.

[0015] The present invention also provides a method for preparing a self-crosslinkable flame-retardant EPDM rubber self-adhesive tape for preparing the above-mentioned self-crosslinkable flame-retardant EPDM rubber self-adhesive tape, including the following steps:

[0016] Put ethylene propylene diene monomer rubber and halogenated butyl rubber into a mixer and mix evenly.

[0017] Respectively add a heat-resistant polymer, a tackifying resin, a processing oil, a flame-retardant filler, and additives, mix until the temperature reaches 135°C - 150°C and then discharge from the mixer, with the time being 20 - 40 minutes. Subsequently, take out the sheet on a two-roll mill and cut it into strips to obtain a standby rubber compound.

[0018] Extrude and mold the above-mentioned standby rubber compound through an extruder to prepare the self-crosslinkable flame-retardant EPDM rubber self-adhesive tape.

[0019] The beneficial effects of the present invention are as follows: The tape prepared by the present invention does not undergo a cross-linking reaction before use, has good conformability, and is convenient for installation. The raw material components of the present invention select alkylphenolic resin and its halogenated modified resin, aralkylphenolic resin and its halogenated modified resin as tackifying resins, all of which contain active groups. On the basis of ensuring that the tape has good adhesiveness, the tape can slowly cross-link during use (above 90 °C), thereby improving the heat resistance and aging resistance; at the same time, adding heat-resistant polymers can also ensure the heat resistance during preparation and use; further adding flame-retardant fillers adapted to the formulation system makes the system have good flame-retardant performance. Detailed embodiments

[0020] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] An embodiment of the present invention provides a self-crosslinkable flame-retardant EPDM self-adhesive tape, and its raw material components by mass include: 60-75 parts of ethylene propylene diene monomer rubber, 10-30 parts of halogenated butyl rubber, 10-50 parts of heat-resistant polymer, 3-12 parts of tackifying resin, 5-30 parts of processing oil, 100-150 parts of flame-retardant filler, and 6-15 parts of auxiliary agent. Among them, the tackifying resin includes one or more of alkylphenolic resin and its halogenated modified resin, aralkylphenolic resin and its halogenated modified resin. The self-crosslinkable flame-retardant EPDM self-adhesive tape does not undergo a cross-linking reaction during the preparation process, but undergoes a slow cross-linking reaction when the temperature reaches 90 °C and above during use.

[0022] It can be understood that the tape prepared by the present invention is usually applied to the insulation and sealing of components such as cables, intermediate joints, and terminals, so it is in a high-temperature environment of 90 °C - 130 °C for a long time during use. The tape prepared by the present invention does not undergo a cross-linking reaction before use, has good conformability, and is convenient for installation. The raw material components of the present invention select alkylphenolic resin and its halogenated modified resin, aralkylphenolic resin and its halogenated modified resin as tackifying resins, all of which contain active groups. On the basis of ensuring that the tape has good adhesiveness, the tape can slowly cross-link during use (above 90 °C), thereby improving the heat resistance and aging resistance; at the same time, adding heat-resistant polymers can also ensure the heat resistance during preparation and use; further adding flame-retardant fillers adapted to the formulation system makes the system have good flame-retardant performance.

[0023] In order to effectively improve the adhesiveness and aging resistance of the tape, the selection of ethylene propylene diene monomer rubber should be coordinated with the addition amount of the tackifying resin. A further preferred embodiment is that when the ethylene content of the ethylene propylene diene monomer rubber is higher than 50%, the addition amount of the tackifying resin is 8-12 parts; when the ethylene content of the ethylene propylene diene monomer rubber is 20% - 50%, the addition amount of the tackifying resin is 3-7 parts.

[0024] The tackifying resin of the present invention selects one or more of alkylphenolic resins and their halogenated modified resins, aralkylphenolic resins and their halogenated modified resins. These resins have good tackiness and their molecular structures contain active groups, and crosslinking reactions occur only when heated during long-term use. Specifically, when the tape is installed and used at a high temperature of 130 °C for a long time, the crosslinking reaction can be completed within 168 hours. Optionally, the tackifying resin is one or more of butylphenolic resin, tert-butylphenolic resin, octylphenolic resin, tert-octylphenolic resin, tert-amylphenolic resin, nonylphenolic resin, and meta-brominated tert-octylphenolic resin.

[0025] In a preferred embodiment, the raw material components of the self-crosslinkable flame-retardant EPDM self-adhesive tape further include a tackifier. By combining the tackifier with the above-mentioned tackifying resin, the tackiness of the material can be improved. The mixing mass ratio of the tackifying resin to the tackifier is 1:(1-3). The tackifier includes coal tar, fatty oil, etc. Among them, the fatty oil is preferably black paste and / or white paste.

[0026] Optionally, the heat-resistant polymer is a polymer with a melting point above 120 °C or a polymer with a benzene ring in its molecular structure, which can increase the melting point to improve the heat resistance and mechanical properties of the material. Preferably, the heat-resistant polymer is one or more of high-density polyethylene, polypropylene, nylon 6, and styrene-butadiene rubber.

[0027] In one embodiment, the flame-retardant filler is a mixture of two or three of decabromodiphenylethane, decabromodiphenyl ether, antimony trioxide, magnesium hydroxide, aluminum hydroxide, and LHX-999 flame retardant. By using at least two flame-retardant fillers in combination, a synergistic system can be formed to improve the flame-retardant performance of the tape. Preferably, the flame-retardant filler is a mixture of three of decabromodiphenylethane, decabromodiphenyl ether, antimony trioxide, magnesium hydroxide, aluminum hydroxide, and LHX-999 flame retardant, and the addition amount of each component is not less than 10 parts.

[0028] Optionally, the halogenated butyl rubber is one or two of brominated butyl rubber and chlorinated butyl rubber, which has good waterproof sealing effect and good heat resistance.

[0029] The additives of the present invention include stearic acid, zinc stearate, anti-aging agent, and antioxidant to improve its processing performance and inhibit the oxidation of rubber, etc. Preferably, the additives include a mixture of two or more of stearic acid, zinc stearate, anti-aging agent RD, anti-aging agent MB, and antioxidant 1010. The processing oil is preferably one or two of naphthenic oil and paraffin oil.

[0030] Based on the above self-crosslinkable flame-retardant EPDM self-adhesive tape, the present invention also provides a preparation method of the self-crosslinkable flame-retardant EPDM self-adhesive tape, which specifically includes the following steps:

[0031] Step (1): Put ethylene propylene diene monomer (EPDM) rubber and halogenated butyl rubber into a Banbury mixer and mix evenly.

[0032] Step (2): Add a heat-resistant polymer, tackifying resin, processing oil, flame retardant filler, and additives respectively, mix until the temperature reaches 135°C - 150°C and then discharge from the mixer. The time is 20 - 40 minutes. Subsequently, sheet out on a two-roll rubber mill and cut into strips to obtain the standby rubber compound.

[0033] Step (3): Extrude and shape the above standby rubber compound through an extruder to prepare a self-crosslinkable flame-retardant EPDM self-adhesive tape.

[0034] In Step 2, the time is 20 - 40 minutes. Since the mixing time is short, the rubber compound will not undergo a crosslinking reaction during the preparation process. In Step 3, the temperature of the extruder is controlled between 130°C and 140°C, and the preferred extrusion temperature is 135°C.

[0035] The following will describe the implementation scheme of the present invention in detail with specific examples. However, those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. For those not specified in the examples, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. For the reagents or instruments not specified in the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0036] Example 1

[0037] In Example 1, the raw material components are as follows by weight: 60 parts of EPDM rubber, 30 parts of halogenated butyl rubber, 30 parts of heat-resistant polymer, 4 parts of tackifying resin, 7 parts of processing oil, 100 parts of flame retardant filler, 6 parts of additives, and 4 parts of tackifier.

[0038] The preparation steps of Example 1 are as follows:

[0039] First, put EPDM rubber and halogenated butyl rubber into a Banbury mixer and mix evenly for 30 minutes.

[0040] Then add the heat-resistant polymer, tackifying resin, processing oil, flame retardant filler, tackifier, and additives respectively, mix until the temperature reaches 150°C and then discharge from the mixer. The time is 20 minutes. Subsequently, sheet out on a two-roll rubber mill and cut into strips to obtain the standby rubber compound.

[0041] Finally, extrude and shape the above standby rubber compound through an extruder. The extrusion temperature is 135°C, the formed thickness is 0.7 mm, and the width is 25 mm. Film is laminated during extrusion, and then it is wound and cut to obtain a self-crosslinkable flame-retardant EPDM self-adhesive tape.

[0042] Furthermore, in addition to Example 1, the present invention also provides other examples and comparative examples. The material formulations of the self-crosslinkable flame-retardant ethylene-propylene rubber self-adhesive tapes for each example and comparative example are shown in Table 1 respectively. According to the formulations in Table 1 and following the preparation method of Example 1, the flame-retardant ethylene-propylene insulating tapes for other examples and each comparative example were prepared respectively, which will not be elaborated here.

[0043] It should be noted that the ethylene content of the ethylene-propylene diene monomer rubber in Examples 7 and 8 and Comparative Example 3 is higher than 50%. The specific grades of the ethylene-propylene diene monomer rubber in Example 7 and Comparative Example 3 are Nordel 3722P, and the specific grade of the ethylene-propylene diene monomer rubber in Example 8 is Arlanxeo 2472E. When the ethylene content of the ethylene-propylene diene monomer rubber in Examples 1-6, 9, 10 and Comparative Examples 1, 2, 4-7 is 20%-50%, the specific grades of the ethylene-propylene diene monomer rubber in Examples 1-3, 9, 10 and Comparative Examples 1, 2, 4-7 are Nordel 3430, and the specific grades of the ethylene-propylene diene monomer rubber in Examples 4-6 are Nordel 3670. In addition, the LHX-999 flame retardant in this example is produced by Shenzhen United Xin Technology Co., Ltd.

[0044] Table 1 Raw material compositions of each example and comparative example

[0045]

[0046]

[0047]

[0048]

[0049] The flame-retardant ethylene-propylene rubber self-adhesive tapes obtained from Examples 1 to 10 and Comparative Examples 1 to 7 above were respectively subjected to performance tests, including tensile strength, elongation at break, UL-94 flame retardant rating, heat stress cracking resistance, tensile strength and elongation at break after 168-hour aging at 130°C (aging condition: 168 hours at 130°C), self-adhesion and vulcanization curve (condition: 150°C, 40 minutes). The test results are shown in Tables 2 and 3. Among them, the self-adhesion test was measured according to the self-adhesion test method in Appendix C of JB / T 6464-2006.

[0050] Table 2 Performance test table

[0051]

[0052]

[0053] Table 3 Vulcanization curves of each example and comparative example

[0054]

[0055]

[0056] Based on the comparison of the test data shown in Table 2 and Table 3, the flame-retardant EPDM self-adhesive tape prepared in each embodiment of the present invention not only has good mechanical properties and flame retardancy, but also its tensile strength can still be maintained above 70% after aging at 130 °C for 168 hours, and the elongation at break can reach more than 450%. This fully shows that the flame-retardant EPDM self-adhesive tape prepared by this formulation system can undergo a gradual cross-linking reaction during aging, enabling the tensile strength to be maintained or increased, and still having the elasticity of rubber without embrittlement.

[0057] Specifically, in each embodiment, when the ethylene content of the ethylene-propylene-diene monomer (EPDM) rubber selected in Example 1 is 20%-50%, the addition amount of the tackifying resin used in combination is 4 parts. In Example 7, the ethylene content of the EPDM rubber is higher than 50%, and the addition amount of the tackifying resin used in combination is 8 parts. Both Example 1 and Example 7 have excellent mechanical properties, flame retardancy, and aging resistance. Compared with Example 7, in Example 8, the ethylene-propylene rubber content of the EPDM rubber selected is higher than 50%, and the addition amount of the tackifying resin is only 3 parts. Its tackiness is slightly worse than that of Example 7, but it does not affect the use. The difference between Example 9 and Example 1 is only that Example 9 does not add coal tar, and its tackiness is worse than that of Example 1, but it does not affect the use. The difference between Example 10 and Example 1 is only that Example 10 selects the addition amount of the tackifying resin to be 12 parts, and the ethylene content of the EPDM rubber is between 20%-50%. The addition amount of the tackifying resin is on the high side. Although it has good tackiness, it is not conducive to cost savings, and due to the high addition amount of the tackifying resin, the mechanical properties of the prepared tape are slightly lower than those of Example 1.

[0058] From the vulcanization curves in Table 3, for Examples 1 to 10 under the specified test conditions (150 °C for 40 minutes), from the start to the end of the test, the maximum torque (MH) relative to the minimum torque (ML) did not increase significantly, and the same is true for the comparative examples; at the same time, Tc90 is above 20 minutes. These two phenomena indicate that although the formulation systems of Examples 1-10 will undergo slow vulcanization and cross-linking during long-term aging, it takes a long time to achieve, and vulcanization and cross-linking do not occur during the processing of the rubber compound. This shows from another perspective that Examples 1-10 have prepared a flame-retardant insulating tape that can cross-link during long-term use but does not affect high-temperature processing.

[0059] In contrast, in each comparative example, the difference between Comparative Example 1 and Example 1 is that the tackifying resin selected in Comparative Example 1 is terpene resin T-100; the difference between Comparative Example 2 and Example 1 is that the tackifying resin selected in Comparative Example 2 is petroleum resin; the difference between Comparative Example 3 and Example 7 is that the tackifying resin selected in Comparative Example 3 is terpene resin T-100. Brittleness occurred in Comparative Examples 1 to 3 after aging at 130 °C for 168 hours, the tensile strength of the material decreased, and at the same time, the elasticity of the rubber was almost lost (the elongation at break was below 200%, and in some examples, it was even less than 100%).

[0060] The difference between Comparative Example 4 and Example 1 is that Comparative Example 4 uses polyisobutylene HB300 to replace halogenated butyl rubber, which affects the continuous vulcanization process of the tape. During the long-term aging process, the crosslinking degree is not as high as that of adding brominated butyl rubber, and the test data also show that the tensile strength after aging is lower than that of Example 1.

[0061] The difference between Comparative Example 5 and Example 1 is that Comparative Example 5 does not add heat-resistant polymer, which affects the heat resistance of the tape. Flow phenomenon occurred during the heat stress cracking process, and the heat resistance was greatly reduced compared with Example 1.

[0062] The difference between Comparative Example 6 and Example 1 is that only 50 parts of flame retardant filler are added in Comparative Example 6; the difference between Comparative Example 7 and Example 1 is that only one type of flame retardant filler is selected. The flame retardant properties of Comparative Examples 6 and 7 are both worse than that of Example 1, and the vertical burning test can only pass the V-1 level.

[0063] It should be noted that in this article, the term "including", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or system including that element.

[0064] The serial numbers of the embodiments of the present invention above are only for description and do not represent the advantages or disadvantages of the embodiments.

[0065] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A self-crosslinkable flame-retardant ethylene-propylene rubber self-adhesive tape, characterized in that, During the preparation process of the self-crosslinkable flame-retardant EPDM self-adhesive tape, there is no crosslinking reaction, while a slow crosslinking reaction occurs when the temperature reaches 90 °C or higher during use; Its raw material components by mass parts include: 60-75 parts of ethylene propylene diene monomer (EPDM), 10-30 parts of halogenated butyl rubber, 10-50 parts of heat-resistant polymer, 3-12 parts of tackifying resin, 5-30 parts of processing oil, 100-150 parts of flame-retardant filler, and 6-15 parts of additives; the tackifying resin includes one or more of alkyl phenolic resin and its halogenated modified resin, aralkyl phenolic resin and its halogenated modified resin.

2. The self-crosslinkable flame-retardant ethylene-propylene rubber self-adhesive tape according to claim 1, characterized in that, When the ethylene content of the ethylene propylene diene monomer (EPDM) is higher than 50%, the addition amount of the tackifying resin is 8-12 parts; when the ethylene content of the ethylene propylene diene monomer (EPDM) is 20%-50%, the addition amount of the tackifying resin is 3-7 parts.

3. The self-crosslinkable flame-retardant ethylene-propylene rubber self-adhesive tape according to claim 1, characterized in that, The tackifying resin is one or more of butyl phenolic resin, tert-butyl phenolic resin, octyl phenolic resin, tert-octyl phenolic resin, tert-amyl phenolic resin, nonyl phenolic resin, and meta-brominated tert-octyl phenolic resin.

4. The self-crosslinkable flame-retardant ethylene-propylene rubber self-adhesive tape according to claim 3, characterized in that, The raw material components of the self-crosslinkable flame-retardant EPDM self-adhesive tape further include a tackifier, and the mixing mass ratio of the tackifying resin to the tackifier is 1:(1-3).

5. The self-crosslinkable flame-retardant ethylene-propylene rubber self-adhesive tape according to claim 1, characterized in that, The heat-resistant polymer is a polymer with a melting point above 120 °C or a polymer with a benzene ring in its molecular structure.

6. The self-crosslinkable flame-retardant ethylene-propylene rubber self-adhesive tape according to claim 5, characterized in that, The heat-resistant polymer is one or more of high-density polyethylene, polypropylene, nylon 6, and styrene-butadiene rubber.

7. The self-crosslinkable flame-retardant ethylene-propylene rubber self-adhesive tape according to claim 1, characterized in that, The flame-retardant filler is a mixture of two or three of decabromodiphenylethane, decabromodiphenyl ether, antimony trioxide, magnesium hydroxide, aluminum hydroxide, and LHX-999 flame retardant.

8. The self-crosslinkable flame-retardant ethylene-propylene rubber self-adhesive tape according to claim 1, characterized in that, The halogenated butyl rubber is one or two of brominated butyl rubber and chlorinated butyl rubber.

9. The self-crosslinkable flame-retardant ethylene-propylene rubber self-adhesive tape according to claim 1, characterized in that, The additives include a mixture of two or more of stearic acid, zinc stearate, antioxidant RD, antioxidant MB, and antioxidant 1010; the processing oil is one or two of naphthenic oil and paraffin oil.

10. A method for preparing a self-crosslinkable flame-retardant ethylene-propylene rubber self-adhesive tape, used for preparing the self-crosslinkable flame-retardant ethylene-propylene rubber self-adhesive tape according to any one of claims 1 to 9, characterized in that, Including the following steps: Put the ethylene propylene diene monomer (EPDM) and halogenated butyl rubber into a mixer and mix evenly; Respectively add the heat-resistant polymer, tackifying resin, processing oil, flame-retardant filler, and additives, mix until the temperature reaches 135 °C - 150 °C and then discharge from the mixer, with the time being 20-40 min. Subsequently, take out the sheet on a two-roll mill and cut it into strips to obtain the standby rubber compound; Extrude and shape the above-mentioned standby rubber compound through an extruder to prepare the self-crosslinkable flame-retardant EPDM self-adhesive tape.

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