CN114316449A - Mixing process for bonding ethylene propylene diene monomer and cord - Google Patents
Mixing process for bonding ethylene propylene diene monomer and cord Download PDFInfo
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Abstract
The application discloses a mixing process for bonding ethylene propylene diene monomer and a cord, which comprises the following steps of mixing ethylene propylene diene monomer in an internal mixer at 110-140 ℃ for 1-3 min; then adding an anti-aging agent, tackifying resin and a methylene acceptor, and mixing for 2-4 min; adding white carbon black, a reinforcing system and paraffin oil, banburying for 4-8 min, and then discharging rubber at 130-150 ℃ to obtain a first-stage rubber compound; and (3) second-stage mixing: and (3) rolling the first-stage rubber compound, cooling to room temperature, banburying at 80-100 ℃ for 20-50 s, adding a methylene donor, an auxiliary vulcanizing agent and a vulcanizing agent, carrying out heat preservation and mixing for 2-5 min, carrying out rubber discharge at 80-100 ℃, carrying out cutting, thin passing, sheet discharging and final vulcanizing. According to the method, the methylene donor and the methylene acceptor are added into the ethylene propylene diene monomer step by step, so that the possibility of reaction of the methylene donor and the methylene acceptor before a vulcanization reaction occurs is reduced, and the bonding performance between the ethylene propylene diene monomer and the thread rope is improved.
Description
Technical Field
The application relates to the technical field of rubber product preparation, in particular to a mixing process for bonding ethylene propylene diene monomer and cords.
Background
At present, most of rubber products are made of composite materials, namely, different framework materials and reinforcing materials are added into a rubber substrate to obtain rubber-framework material composite products with different properties.
When the ethylene propylene diene monomer is selected as a rubber material and the cord is selected as a framework material, the ethylene propylene diene monomer is lack of active genes in molecular chains and has small molecular cohesive energy and poor self-adhesiveness and mutual adhesiveness, so that the adhesion between the ethylene propylene diene monomer and the cord is difficult, the adhesion performance between the ethylene propylene diene monomer and the cord is poor, and the application of the ethylene propylene diene monomer composite product is limited to a certain extent.
In the related technology, a methyl-methylene system is used as a tackifier and is added into ethylene propylene diene monomer together with auxiliaries such as a vulcanizing agent and the like for mixing, but the tackifying effect of the methyl-methylene system is poor, the adhesive strength between the ethylene propylene diene monomer and the cord is only 38.2KN/m, and the adhesive strength between the ethylene propylene diene monomer and the cord needs to be further developed.
Disclosure of Invention
In order to improve the bonding performance of ethylene propylene diene monomer and a cord, the application provides a mixing process for bonding ethylene propylene diene monomer and the cord.
The mixing process for bonding the ethylene propylene diene monomer and the cord adopts the following technical scheme:
a mixing process for bonding ethylene propylene diene monomer and cord comprises the following steps:
first-stage mixing: after the ethylene propylene diene monomer is mixed, adding an anti-aging agent, tackifying resin and a methylene acceptor into the ethylene propylene diene monomer, and mixing for 2-4 min at 110-140 ℃; adding white carbon black, a reinforcing system and paraffin oil, carrying out heat preservation and banburying for 4-8 min, and then discharging rubber at 130-150 ℃ to obtain a first-stage rubber compound;
and (3) second-stage mixing: the first-stage rubber compound is subjected to roll cooling and then banburying at 80-100 ℃ for 20-50 s, then methylene donor, co-vulcanizing agent and vulcanizing agent are added for heat preservation and mixing for 2-5 min, rubber removal is carried out at 80-100 ℃, and finally vulcanization is carried out after cutting knife, thin passing, sheet discharging and sheet discharging;
the ethylene-propylene-diene monomer rubber comprises, by weight, 100 parts of ethylene-propylene-diene monomer rubber, 5-20 parts of a vulcanizing agent, 5-20 parts of an auxiliary vulcanizing agent, 5-14 parts of a total addition amount of a methylene acceptor and a methylene donor, 10-30 parts of white carbon black, 10-30 parts of non-reactive alkyl phenolic resin, 30-60 parts of a reinforcing system and 3-10 parts of an anti-aging agent.
By adopting the technical scheme, the methylene acceptor and the methylene donor are added into the ethylene propylene diene monomer step by step, so that the possibility of reaction between the methylene acceptor and the methylene donor before the vulcanization step is reduced. Compared with the traditional one-stage mixing method, the methylene acceptor and the methylene donor react in the vulcanization process to generate the phenolic resin with oligomerization and continuous reaction capability, and the hydroxymethyl and the hydroxyl in the phenolic resin are chemically bonded with the polar groups (-OH, -COOH and the like) on the surfaces of the cords;
moreover, because the methylene acceptor does not react in the mixing process, compared with the traditional one-stage mixing method, the method can improve the mixing temperature in one-stage mixing step, improve the dispersion condition of auxiliary agents such as the methylene acceptor and the like in the ethylene propylene diene monomer, and is favorable for improving the vulcanization characteristic of the ethylene propylene diene monomer; meanwhile, the water content of the ethylene propylene diene monomer is fully reduced, and the bonding strength between the ethylene propylene diene monomer and the cord is further improved;
the methylene acceptor, the methylene donor and the tackifying resin are compounded for use, so that the self-adhesive performance of the ethylene propylene diene monomer is improved, a synergistic effect is achieved, the molecular chain of the ethylene propylene diene monomer is activated, the diffusion and entanglement capacity of the molecular chain of the ethylene propylene diene monomer is improved, the ethylene propylene diene monomer can fully infiltrate the cord before vulcanization reaction and quickly diffuse into the cord, the adhesive performance of the ethylene propylene diene monomer and the cord and the coating rate of the ethylene propylene diene monomer on the cord are obviously improved, and the coating rate can reach 100%.
Optionally, the vulcanizing agent is any one of diisopropylbenzene peroxide, 1, 3-bis (tert-butylperoxydiisopropyl) benzene and 2, 5-dimethyl-2, 5- (di-tert-butylperoxy) hexane.
Optionally, the co-vulcanizing agent is N, N, -m-phenylene bismaleimide.
By adopting the technical scheme, the vulcanizing agent in the application selects the peroxide vulcanization system, compared with the traditional sulfur vulcanization system, the peroxide vulcanization has better heat resistance, but the general adhesion of the peroxide vulcanization system is poorer, so that the defect of poor adhesion of the peroxide vulcanization system is overcome by matching the peroxide vulcanization system with the maleic amide auxiliary vulcanizing agent, the adhesion strength of the ethylene propylene diene monomer is further improved, and the rubber coating rate of the ethylene propylene diene monomer is as high as 100%.
Optionally, the methylene acceptor is any one of RE, RS, R-80, and PN760, and the methylene donor is any one of RA and HMMM.
Preferably, the methylene acceptor is selected from PN760, the methylene donor is selected from RA, and the weight ratio of PN760 to RA is (3-8) to (2-6).
By adopting the technical scheme, the PN760 is matched with the RA, and the PN760 is slightly excessive, so that the crosslinking density between the ethylene propylene diene monomer and the cord can be effectively improved, and the reasons are as follows:
firstly, as PN760 is acidic, the acidic group can hinder the generation of free radicals, delay vulcanization and prolong the positive vulcanization time, so that the crosslinking density between PN760 and RA and the crosslinking density between tackifying resin formed by the reaction of PN760 and RA, ethylene propylene diene monomer and cord are increased, the wetting effect of the ethylene propylene diene monomer on the cord is further improved, and the bonding performance and the glue covering rate between the ethylene propylene diene monomer and the cord are improved; and secondly, polar groups contained in PN760 and RA can be bonded with polar groups on the surface of the cord, so that the bonding performance and the coating rate between ethylene propylene diene monomer and the cord are further improved.
Preferably, in the step S1, a vinyl silane coupling agent is further added, a weight ratio of the vinyl silane coupling agent to the white carbon black is 1:10, and the vinyl silane coupling agent is banburied together with the white carbon black.
By adopting the technical scheme, the surface of the white carbon black is modified by the reaction of the vinyl silane coupling agent and the silanol group in the mixing process, so that the activity of the vinyl silane coupling agent is reduced to reduce the influence on the vulcanization aspect, the combination of the white carbon black and rubber macromolecules is promoted, the dispersity of the rubber material is improved, the formation of a filler network is reduced, and the vulcanization characteristic, the comprehensive physical property, the dynamic property and the processing property of the white carbon black reinforced ethylene propylene diene monomer are further improved; compared with the traditional silane coupling agent Si-69, the vinyl silane coupling agent is more suitable for a peroxide vulcanization system.
Preferably, the tackifying resin is a non-reactive alkyl phenol-formaldehyde resin.
By adopting the technical scheme, phenolic hydroxyl contained in the non-reactive alkyl phenolic resin has better polarity, and the phenolic hydroxyl is added into the ethylene propylene diene monomer and can migrate to the surface of the ethylene propylene diene monomer, so that the condition of poor interface compatibility between the ethylene propylene diene monomer and the cord is improved, and the bonding strength and the glue coverage rate between the ethylene propylene diene monomer and the cord are improved; the alkyl chain in the non-reactive alkyl phenolic resin is non-polar, has good compatibility with ethylene propylene diene monomer, can be completely dispersed in the ethylene propylene diene monomer in the banburying process, and is favorable for improving the processability of the ethylene propylene diene monomer.
Optionally, the reinforcing system is one or more of carbon black N330 and carbon black N550.
Preferably, the reinforcing system is formed by compounding carbon black N330 and carbon black N550 according to the weight ratio of 1: 1.
By adopting the technical scheme, compared with the use of white carbon black, the compounding of the carbon black N330 and the carbon black N550 can prolong the positive vulcanization time of the ethylene propylene diene monomer; and the carbon black N330 and the carbon black N550 have moderate structures, can fully disperse in the ethylene propylene diene monomer while playing a good reinforcing role on the ethylene propylene diene monomer, and do not influence the bonding performance between the ethylene propylene diene monomer and the thread rope.
Optionally, the anti-aging agent is one or more of RD, MB and BLE.
By adopting the technical scheme, the anti-aging agent improves the heat resistance of the ethylene propylene diene monomer and other auxiliaries in the banburying process, and reduces the possibility of scorching of the ethylene propylene diene monomer and other auxiliaries.
In summary, the present application has the following beneficial effects:
1. the methylene acceptor and the methylene donor are put into the ethylene propylene diene monomer rubber step by step for banburying, so that the methylene acceptor and the methylene donor do not react before vulcanization reaction and are combined with tackifying resin, an ethylene propylene diene monomer rubber molecular chain is activated, the interface compatibility between the ethylene propylene diene monomer rubber and the cord is improved, the cord can be fully soaked by the ethylene propylene diene monomer rubber molecular chain before vulcanization reaction, the ethylene propylene diene monomer rubber molecular chain is fully attached to the cord during vulcanization reaction, the adhesive property between the ethylene propylene diene monomer rubber and the cord is improved, and the rubber coating rate can reach 100%.
2. In the application, a peroxide vulcanization system and a maleic amide auxiliary vulcanizing agent are preferably adopted, and the defect of poor adhesion of the peroxide vulcanization system is overcome by matching the peroxide vulcanization system and the maleic amide auxiliary vulcanizing agent, so that the adhesion strength of the ethylene propylene diene monomer is further improved.
3. In the application, the PN760 is preferably selected to be matched with the RA, so that the crosslinking density between the ethylene propylene diene monomer and the cord is effectively improved, and the bonding performance and the rubber coating rate between the ethylene propylene diene monomer and the cord are effectively improved.
Drawings
FIG. 1 is a graph comparing example 1 of the present application with comparative example 1 in a cord stripping test, wherein the left side is example 1 and the right side is comparative example 1;
FIG. 2 is a graph comparing example 1 of the present application with comparative example 1 in a cord extraction test, in which example 1 is on the left side and comparative example 1 is on the right side.
Detailed Description
Unless otherwise stated, the sources of the raw materials in the examples and comparative examples of the present application are shown in Table 1 below.
TABLE 1 sources of raw materials
Examples
Example 1
A mixing process for bonding ethylene propylene diene monomer and cord comprises the following formula:
5 parts of an anti-aging agent RD, 5 parts of an anti-aging agent MB, 30 parts of non-reactive alkyl phenolic resin, 7606 parts of methylene acceptor PN, EH-530 parts of white carbon black, 3 parts of vinyl triacetoxysilane, 30 parts of carbon black N33030, N55030 parts of carbon black, 10 parts of paraffin oil, RA-658 parts of methylene donor, HVA-210 parts of an auxiliary vulcanizing agent and 10 parts of diisopropylbenzene peroxide, wherein the weight of the anti-aging agent is calculated by 100 parts of ethylene propylene diene monomer;
the method comprises the following steps:
first-stage mixing: putting ethylene propylene diene monomer rubber into an internal mixer at 140 ℃, keeping the temperature and mixing for 60s, then adding an anti-aging agent RD, an anti-aging agent MB, a non-reactive alkyl phenolic resin and a methylene acceptor PN760, and keeping the temperature and mixing for 2 min; adding white carbon black EH-5, vinyl triacetoxysilane, carbon black N330, carbon black N550 and paraffin oil, keeping the temperature and banburying for 4min, and then carrying out rubber discharge at 150 ℃ to obtain a rubber compound;
and (3) second-stage mixing: and (2) rolling the first-stage rubber compound for 3 times, cooling to 25 ℃, then placing the first-stage rubber compound into a 100 ℃ internal mixer for internal mixing for 20s, then adding a methylene donor RA-65, an auxiliary vulcanizing agent HVA-2 and dicumyl peroxide, carrying out heat preservation and mixing for 2min, then carrying out rubber discharge at 100 ℃, placing the mixture into an open mill, carrying out thin passing for 6 times by a left cutter and a right cutter for 5 times, discharging the sheets, standing for 8h, heating to 160 ℃, and vulcanizing for 30 min.
Example 2
The mixing process of the bonding of the ethylene propylene diene monomer and the wire rope is different from that of the example 1 in that the auxiliary vulcanizing agent is different, and the auxiliary vulcanizing agent TMPTMA and the like are used for replacing HVA-2 in mass.
Example 3
A mixing process of ethylene propylene diene monomer and wire bonding, which is different from the example 1 in that a methylene acceptor and a methylene donor are combined differently, and PN760 is replaced by RE and the like.
Example 4
A process for mixing ethylene propylene diene monomer and a wire rope, which is different from the process of example 1 in that a methylene acceptor and a methylene donor are combined, and RA-65 is replaced by HMMM and other substances.
Example 5
A mixing process of ethylene propylene diene monomer and wire bonding is different from that of the example 1 in that the combination of a methylene acceptor and a methylene donor is different, and masses such as RE are used for replacing PN760, and masses such as HMMM are used for replacing RA-65.
Example 6
The mixing process of bonding ethylene propylene diene monomer and wire rope is different from that of the embodiment 1 in that the weight parts of PN760 and RA-65 are different, the weight part of PN760 is 8, and the weight part of RA-65 is 2.
Example 7
The mixing process of bonding ethylene propylene diene monomer and wire rope is different from that of the embodiment 1 in that PN760 and RA-65 are different in parts by weight, the part by weight of PN760 is 3, and the part by weight of RA-65 is 6.
Example 8
The difference between the mixing process for bonding ethylene propylene diene monomer and cord and the example 1 is that the weight part of white carbon black is different, and the weight part of white carbon black EH-5 is adjusted to be 20 parts.
Example 9
The difference between the mixing process for bonding ethylene propylene diene monomer and cord and the example 1 is that the white carbon black EH-5 parts by weight is adjusted to 10 parts by weight.
Example 10
The difference between the mixing process for bonding ethylene propylene diene monomer and the cord and the example 1 is that no silane coupling agent is added in a vulcanization system, and white carbon black EH-5 and other mass are used for replacing vinyl triacetoxysilane.
Example 11
The mixing process of bonding ethylene propylene diene monomer and wire rope is different from that of the example 1 in that different silane coupling agents are used in a vulcanization system, and the vinyl triacetoxysilane is replaced by the silane coupling agent Si-69 and the like.
Example 12
The difference between the mixing process of the ethylene propylene diene monomer and the wire rope bonding is that the non-reactive alkyl phenolic resin is replaced by the mass of gum rosin and the like, and the type of tackifying resin is different from that of the embodiment 1.
Example 13
The mixing process for bonding ethylene propylene diene monomer and cord is different from that of the example 1 in the following specific parts by weight: based on 100 parts of ethylene propylene diene monomer, 1.5 parts of an anti-aging agent RD, 1.5 parts of an anti-aging agent MB, 10 parts of non-reactive alkyl phenolic resin, 7606 parts of methylene acceptor PN, 30 parts of white carbon black, 3 parts of vinyl triacetoxysilane, 33015 parts of carbon black N, 55015 parts of carbon black N, 10 parts of paraffin oil, RA-658 parts of methylene donor, HVA-25 parts of an auxiliary vulcanizing agent and 5 parts of diisopropylbenzene peroxide.
Example 14
The mixing process for bonding ethylene propylene diene monomer and cord is different from that of the example 1 in the following specific parts by weight: the rubber comprises, by 100 parts of ethylene propylene diene monomer, 5 parts of an anti-aging agent RD, 5 parts of an anti-aging agent MB, 20 parts of a non-reactive alkyl phenolic resin, 7606 parts of a methylene acceptor PN, 20 parts of white carbon black, 2 parts of vinyl triacetoxysilane, 20 parts of carbon black N33020, 20 parts of carbon black N55020, 10 parts of paraffin oil, RA-658 parts of a methylene donor, 220 parts of an auxiliary vulcanizing agent HVA-220 and 20 parts of diisopropylbenzene peroxide.
Example 15
The mixing process for bonding ethylene propylene diene monomer and cord is different from that of the example 1 in the process parameters in the first-stage mixing step and the second-stage mixing step, and the specific parameters are as follows:
first-stage mixing: putting ethylene propylene diene monomer rubber into an internal mixer at 110 ℃, keeping the temperature and mixing for 60s, then adding an anti-aging agent RD, an anti-aging agent MB, a non-reactive alkyl phenolic resin and a methylene acceptor PN760, and keeping the temperature and mixing for 4 min; adding white carbon black EH-5, vinyl triacetoxysilane, carbon black N330, carbon black N550 and paraffin oil, keeping the temperature and banburying for 8min, and then carrying out rubber discharge at 130 ℃ to obtain a rubber compound;
and (3) second-stage mixing: and (2) rolling the first-stage rubber compound for 3 times, cooling to 25 ℃, then placing the first-stage rubber compound into an internal mixer at 80 ℃ for internal mixing for 50s, then adding a methylene donor RA-65, an auxiliary vulcanizing agent HVA-2 and diisopropylbenzene peroxide, keeping the temperature and mixing for 5min, then carrying out rubber discharge at 80 ℃, placing the rubber compound into an open mill, carrying out thin passing for 6 times by a left cutter and a right cutter, discharging the rubber compound, standing for 8h, heating to 160 ℃, and vulcanizing for 30 min.
Comparative example
Comparative example 1
The mixing process for bonding ethylene propylene diene monomer and cord is different from the mixing process in example 1 in the following specific steps:
putting ethylene propylene diene monomer rubber into an internal mixer at the temperature of 140 ℃ for mixing for 60s, and then adding an anti-aging agent RD, an anti-aging agent MB, non-reactive alkyl phenolic resin, a methylene acceptor PN760, a methylene donor RA-65, a co-vulcanizing agent HVA-2 and diisopropylbenzene peroxide for mixing for 2 min; adding white carbon black, vinyl triacetoxysilane, carbon black N330, carbon black N550 and paraffin oil, banburying for 4min, removing rubber at 150 deg.C, rolling for 3 times, cutting for 5 times, passing through for 6 times, taking out, standing for 8 hr, heating to 160 deg.C, and vulcanizing for 30 min. .
Comparative example 2
The difference between the mixing process of bonding ethylene propylene diene monomer and cord and the embodiment 1 is that the adding sequence of vulcanizing agent in the first mixing step is different, and the vulcanizing agent of di-isopropyl benzene peroxide is added into the ethylene propylene diene monomer along with the anti-aging agent RD, the anti-aging agent MB, the non-reactive alkyl phenolic resin and the methylene acceptor PN 760.
Comparative example 3
The difference between the mixing process for bonding ethylene propylene diene monomer and cord and the embodiment 1 is that the adding sequence of the vulcanizing agent in the first mixing step is different, and the vulcanizing agent and the co-vulcanizing agent are added into the ethylene propylene diene monomer along with the antioxidant RD, the antioxidant MB, the non-reactive alkyl phenolic resin and the methylene acceptor PN 760.
Comparative example 4
The mixing process of bonding ethylene propylene diene monomer and cord is different from that of example 1 in that the mixing temperature in the first mixing step is different and is 100 ℃.
Comparative example 5
The mixing process for bonding ethylene propylene diene monomer and cord is different from that of example 1 in that the white carbon black EH-5 parts by weight is adjusted to 8 parts by weight.
Comparative example 6
A mixing process for bonding ethylene propylene diene monomer and a cord comprises the step of replacing 30 parts of non-reactive alkyl phenolic resin with 4 parts of PN760, 5 parts of RA-65 and 21 parts of white carbon black.
Performance test
T10(s): the time of T10 on the rubber vulcanization tester, i.e., the scorch time, was recorded, with shorter times indicating easier scorch.
Adhesive strength (kN/m): testing according to GB/T532-1997;
average peel strength (KN/m): testing according to GB/T2942-1991 on a tensile machine, wherein the extraction rate is 500mm/min, and the testing temperature is 20 +/-5 ℃;
gel coverage (%): the coating amount of the surface of the cord after being drawn out from the vulcanized rubber is visually observed and evaluated within the range of 0-100%;
elongation at break (%): the test was carried out according to GB/T1040-92.
The result of the detection
TABLE 2 Performance test data for examples 1-15 and comparative examples 1-6
Combining example 1, comparative example 1, and table 2 with the accompanying figures 1-2, it can be seen that: comparative example 1 has the same composition as example 1, but the mixing method is different, the adhesive strength between the ethylene propylene diene monomer and the wire rope is improved from 35.9KN/m to 52.2KN/m, and is increased by 45.4%; the average peel strength between the ethylene propylene diene monomer and the cord is improved from 34.9KN/m to 51.2KN/m, and is increased by 46.7 percent; shows that: the bonding performance between the cord and the ethylene propylene diene monomer is improved obviously no matter the cord is stripped or drawn out.
Fig. 1 and fig. 2 show the rubber coating condition of the ethylene propylene diene monomer rubber on the cord prepared by the mixing method of the embodiment 1 and the rubber coating condition of the ethylene propylene diene monomer rubber on the cord prepared by the mixing method of the comparative example 1, and it can be seen from the drawings that burrs are clearly seen around the cord of the left figure (embodiment 1), the surface is uneven, and the adhesion rate of the burrs on the cord in the length direction reaches 100%, that is, the rubber coating rate reaches 100%; the right side (comparative example 1) of the figure shows a smooth periphery of the cord with less burrs, i.e., the coating rate was considered to be 20%.
Combining example 1 and comparative examples 2-3 and table 2, it can be seen that: when the vulcanizing agent and the co-vulcanizing agent are added into a first-stage mixing step, T10 is only about 34s, scorching phenomenon can occur in actual production, rubber is aged, and therefore, the vulcanizing agent and the co-vulcanizing agent cannot be added into the first-stage mixing step for mixing.
Combining example 1 and comparative example 4 and table 2, it can be seen that: the banburying temperature has a great influence on the bonding performance of the ethylene propylene diene monomer, and when the banburying temperature is lower than 110 ℃, all auxiliary agents in the ethylene propylene diene monomer are not sufficiently dispersed, so that the bonding performance between the ethylene propylene diene monomer and the cord is also reduced.
Combining example 1 and comparative example 5 and table 2, it can be seen that: the addition amount of the white carbon black has a large influence on the bonding performance of the ethylene propylene diene monomer, when the white carbon black is less than 10 parts, the bonding performance of the ethylene propylene diene monomer is remarkably reduced, the bonding strength between the ethylene propylene diene monomer and the cord is reduced to 36.2KN/m, the average peel strength is reduced to 35.9KN/m, and the glue coverage rate is only 36%.
Combining example 1 and comparative example 6 with table 2, it can be seen that: comparative example 6, in which no tackifying resin was added, reduced the adhesive strength between the ethylene propylene diene monomer and the cord to 40.5KN/m, reduced the average peel strength to 39.8KN/m, and the cover ratio was only 77%, indicating that: the adhesive property between the ethylene propylene diene monomer and the thread rope is obviously reduced without using tackifying resin, so the methylene acceptor, the methylene donor and the tackifying resin are compounded for use, and the function of synergy is realized in the aspect of improving the self-adhesive property of the ethylene propylene diene monomer.
As can be seen by combining examples 1-2 with Table 2: in example 2, trimethylolpropane trimethacrylate is used as a co-vulcanizing agent, the adhesive strength and the average peeling strength between the ethylene propylene diene monomer rubber and the wire rope prepared in example 2 are not as good as those of example 1, and the rubber coverage rate of example 1 is higher than that of example 2; shows that: the auxiliary vulcanizing agents of the maleic amide type are matched with the vulcanizing agent of the peroxide, and have the synergistic effect in the aspects of improving the adhesive strength and the rubber coating rate of the ethylene propylene diene monomer.
In combination with examples 1,3 to 7 and in combination with Table 2, it can be seen that: the optimal combination of the methylene acceptor and the methylene donor is PN760 and RA-65, and the bonding strength and the average peel strength between the ethylene propylene diene monomer rubber and the thread rope are better after the two are compounded; and the weight ratio of PN760 and RA-65 has larger influence on the bonding performance of the ethylene propylene diene monomer, and when PN760 is less, the bonding performance of the ethylene propylene diene monomer is weakened.
It can be seen from the combination of examples 1 and 10-11 and table 2 that the improvement effect of the ethylene-propylene-diene monomer vulcanization system by using the vinyl silane coupling agent is better than that of the conventional silane coupling agent Si-69, and the adhesive strength, the average peel strength and the coating rate between the ethylene-propylene-diene monomer and the cord are all the best by using the vinyltriacetoxysilane in example 1.
By combining examples 1 and 12 and table 2, it can be seen that the non-reactive alkylphenol resin has a better adhesion promotion effect, and compared with other tackifying resins, the adhesive property and the adhesive coverage rate of the ethylene propylene diene monomer are obviously improved.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The mixing process for bonding ethylene propylene diene monomer and cord is characterized by comprising the following steps:
first-stage mixing: after the ethylene propylene diene monomer is mixed, adding an anti-aging agent, tackifying resin and a methylene acceptor into the ethylene propylene diene monomer, and mixing for 2-4 min at 110-140 ℃; adding white carbon black, a reinforcing system and paraffin oil, carrying out heat preservation and banburying for 4-8 min, and then discharging rubber at 130-150 ℃ to obtain a first-stage rubber compound;
and (3) second-stage mixing: the first-stage rubber compound is subjected to roll cooling and then banburying at 80-100 ℃ for 20-50 s, then methylene donor, co-vulcanizing agent and vulcanizing agent are added for heat preservation and mixing for 2-5 min, rubber removal is carried out at 80-100 ℃, and finally vulcanization is carried out after cutting knife, thin passing, sheet discharging and sheet discharging;
the ethylene-propylene-diene monomer rubber comprises, by weight, 100 parts of ethylene-propylene-diene monomer rubber, 5-20 parts of a vulcanizing agent, 5-20 parts of an auxiliary vulcanizing agent, 5-14 parts of a total addition amount of a methylene acceptor and a methylene donor, 10-30 parts of white carbon black, 10-30 parts of non-reactive alkyl phenolic resin, 30-60 parts of a reinforcing system and 3-10 parts of an anti-aging agent.
2. The mixing process for bonding ethylene propylene diene monomer and wire rope according to claim 1, which is characterized in that: the vulcanizing agent is any one of diisopropylbenzene peroxide, 1, 3-bis (tert-butyl peroxy diisopropyl) benzene and 2, 5-dimethyl-2, 5- (di-tert-butyl peroxy) hexane.
3. The mixing process for bonding ethylene propylene diene monomer and wire rope according to claim 2, characterized in that: the co-vulcanizing agent is N, N-m-phenylene bismaleimide.
4. The mixing process for bonding ethylene propylene diene monomer and wire rope according to claim 1, which is characterized in that: the methylene acceptor is any one of RE, RS, R-80 and PN760, and the methylene donor is any one of RA and HMMM.
5. The mixing process for bonding ethylene propylene diene monomer and wire rope according to claim 4, wherein the mixing process comprises the following steps: the methylene acceptor is selected from PN760, the methylene donor is selected from RA, and the weight ratio of PN760 to RA is (3-8) to (2-6).
6. The mixing process for bonding ethylene propylene diene monomer and wire rope according to claim 1, which is characterized in that: and in the step S1, a vinyl silane coupling agent is further added, the weight ratio of the vinyl silane coupling agent to the white carbon black is 1:10, and the vinyl silane coupling agent is banburied together with the white carbon black.
7. The mixing process for bonding ethylene propylene diene monomer and wire rope according to claim 1, which is characterized in that: the tackifying resin is non-reactive alkyl phenolic resin.
8. The mixing process for bonding ethylene propylene diene monomer and wire rope according to claim 7, wherein the mixing process comprises the following steps: the reinforcing system is one or more of carbon black N330 and carbon black N550.
9. The mixing process for bonding the ethylene propylene diene monomer and the wire rope according to claim 1, wherein the reinforcing system is formed by compounding carbon black N330 and carbon black N550 in a weight ratio of 1: 1.
10. The process of claim 1, wherein the antioxidant is one or more of RD, MB and BLE.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111681359.6A CN114316449B (en) | 2021-12-31 | 2021-12-31 | Mixing process for bonding ethylene propylene diene monomer and cotton rope |
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