CN114516989B - EPDM halogen-free flame retardant rubber and preparation method thereof - Google Patents

EPDM halogen-free flame retardant rubber and preparation method thereof Download PDF

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CN114516989B
CN114516989B CN202210111324.7A CN202210111324A CN114516989B CN 114516989 B CN114516989 B CN 114516989B CN 202210111324 A CN202210111324 A CN 202210111324A CN 114516989 B CN114516989 B CN 114516989B
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flame retardant
rubber
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halogen
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CN114516989A (en
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黄世恒
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Guangdong Xinhui Technology Co ltd
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JIANGMEN XINHUI SEALING TECHNOLOGY CO LTD
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/22—Halogen free composition
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
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  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
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Abstract

The application relates to the technical field of rubber compounding and vulcanization. The halogen-free flame-retardant rubber is prepared by taking Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber and non-oil-extended EPDM rubber as a matrix, selecting an organic phosphorus-nitrogen flame retardant as a halogen-free flame retardant and assisting with an auxiliary agent, so that the prepared halogen-free flame-retardant rubber can meet the flame-retardant requirement of 0.5mm U94-V0 level under the requirement of lower hardness, and the rubber has good processability and physical properties. The EPDM halogen-free flame retardant rubber has the characteristic of environmental protection, can meet the environmental protection requirement, has wide application market and creates higher economic benefit.

Description

EPDM halogen-free flame retardant rubber and preparation method thereof
Technical Field
The application belongs to the technical field of rubber compounding and vulcanization, and particularly relates to EPDM halogen-free flame retardant rubber, and a preparation method and application thereof.
Background
Ethylene Propylene Diene Monomer (EPDM) is a terpolymer of ethylene, propylene, and non-conjugated diene, and the main polymer chain of the EPDM is fully saturated, so that the material can resist heat, light, oxygen, and the like. The ethylene propylene diene monomer is extremely widely applied to the fields of house construction, wires and cables, automobile industry and the like, and particularly has a plurality of applications in the wires and cables and the automobile industry, such as wires for construction, mining cables, wires for nuclear power stations, sealing strips, rubber belts and the like. There will be more and more ethylene propylene diene monomer products used in various industries in the future. Among these many applications, many require flame retardant effects, some even require very high flame retardant ratings, such as mining cables, wires, and the like.
The ethylene propylene diene monomer flame retardant material is the most widely used rubber material at present, and most of the flame retardant materials are filled with non-environment-friendly flame retardant filler (such as decabromodiphenyl ethane) for achieving good flame retardant effect, and the ethylene propylene diene monomer flame retardant material has good flame retardant effect but larger pollution, so that the ethylene propylene diene monomer flame retardant rubber has small application range in sustainable development strategy and limited application. Therefore, it is necessary to prepare a novel EPDM halogen-free flame retardant rubber, which has the characteristic of environmental friendliness and has excellent flame retardant property under the environment-friendly requirement. Solves the problem of environmental protection, has the characteristics of excellent flame retardance and good physical properties, and ensures that the EPDM halogen-free flame retardant rubber gets rid of application limitation and has wider and wider application range.
Disclosure of Invention
The present application aims to solve at least one of the technical problems in the prior art described above. Therefore, the application provides the EPDM halogen-free flame-retardant rubber, which uses halogen-free flame-retardant materials to replace the prior decabromodiphenyl ethane filler, has the characteristic of environmental protection, and can meet the environmental protection requirement. In addition, the EPDM halogen-free flame retardant rubber has excellent flame retardant grade effect and good physical property characteristics.
The application also provides a preparation method of the EPDM halogen-free flame retardant rubber.
The application also provides application of the EPDM halogen-free flame-retardant rubber in wires and cables.
According to one aspect of the application, there is provided an EPDM halogen-free flame retardant rubber comprising the following components in parts by weight:
110-155 parts of Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber;
15-40 parts of non-oil-filled ethylene propylene diene monomer;
110-160 parts of organic phosphorus-nitrogen flame retardant; and
19-52 parts of auxiliary agent.
Preferably, the weight part of the Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber is 115-150 parts; more preferably, the weight part of the Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber is 128-150 parts; specifically, the weight portion of the Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber can be 128 parts, 130 parts, 135 parts, 140 parts, 145 parts or 150 parts.
Preferably, the parts of oil filled in the Ethylene Propylene Diene Monomer (EPDM) oil-filled crude rubber are 55-65 parts by weight; preferably, the parts of the ethylene propylene diene monomer crude rubber oil are 50-60 parts, for example 50 parts, 55 parts or 60 parts.
Preferably, the weight part of the non-oil-filled ethylene propylene diene monomer rubber is 15-40 parts; preferably, the weight part of the non-oil-filled ethylene propylene diene monomer rubber is 17-35 parts; more preferably, the weight part of the non-oil-filled ethylene propylene diene monomer rubber is 17-30 parts; specifically, the parts by weight of the non-oil-filled ethylene propylene diene monomer rubber can be 17 parts, 20 parts, 25 parts or 30 parts.
Preferably, the weight part of the organophosphorus nitrogen flame retardant is 115-155 parts; preferably, the weight part of the organic phosphorus-nitrogen flame retardant is 120-150 parts; specifically, the weight portion of the organic phosphorus nitrogen flame retardant may be 120 parts, 125 parts, 130 parts, 135 parts, 140 parts, 145 parts or 150 parts.
The organic phosphorus-nitrogen compound flame retardant adopted by the application has good self-extinguishing property after leaving fire, low smoke, low toxicity, environmental protection, no halogen and higher physical property.
Preferably, the weight portion of the auxiliary agent is 20-45 portions.
In some preferred embodiments of the present application, the EPDM halogen-free flame retardant rubber comprises the following components in parts by weight:
115-150 parts of Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber;
17-35 parts of non-oil-filled ethylene propylene diene monomer;
115-155 parts of organic phosphorus-nitrogen flame retardant; and
20-45 parts of auxiliary agent.
In some more preferred embodiments of the present application, the EPDM halogen-free flame retardant rubber comprises, in parts by weight:
128-150 parts of Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber;
17-30 parts of non-oil-filled ethylene propylene diene monomer;
120-150 parts of organic phosphorus-nitrogen flame retardant; and
20-45 parts of auxiliary agent.
The EPDM halogen-free flame retardant rubber prepared under the condition has excellent halogen-free flame retardant effect, can reach high-level 0.5mm U94-V0, has lower hardness (50+/-5 SHA), has good physical properties, and can be widely applied.
In some embodiments of the application, the Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber is an Ethylene Propylene Diene Monomer (EPDM) rubber with an ethylene content of 56-60, an ENB content of 4.0-5.0 and a Mooney viscosity ML (1+4) at 125 ℃ of 48-56.
In some embodiments of the application, the ethylene propylene diene monomer extended crude is 694 extended crude. The 694 oil-filled raw rubber is raw rubber filled paraffin oil.
In some embodiments of the application, the oil-extended ethylene propylene diene monomer is 5740Q oil-extended raw rubber.
In some embodiments of the application, the organophosphorus nitrogen-based flame retardant is a Longsafu 211 flame retardant.
In some embodiments of the application, 694 oil-filled raw rubber is available from lion chemical company, U.S.;
the oil-free crude 5470Q was purchased from lang Cheng Jituan, germany;
flame retardant Longsafu 211 was purchased from Shanghai general industries, inc.
According to some preferred embodiments of the application, the auxiliary agents include inorganic flame retardant auxiliary agents, vulcanizing agents, fillers, compounding agents and accelerators.
According to some preferred embodiments of the present application, the auxiliary agent comprises, in parts by weight, 5-20 parts of an inorganic flame retardant auxiliary agent, 1-2 parts of a vulcanizing agent, 5-15 parts of a filler, 5-10 parts of a compounding agent, and 3-5 parts of an accelerator.
The inorganic flame retardant auxiliary has the effects of increasing oxygen index and reducing smoke concentration. Preferably, the weight part of the inorganic flame retardant auxiliary is 7-15 parts; specifically, the weight portion of the inorganic flame retardant auxiliary may be 7 parts, 10 parts, 12 parts or 15 parts.
In some embodiments of the application, the inorganic flame retardant aid is at least one of magnesium hydroxide and aluminum hydroxide.
In some preferred embodiments of the present application, the vulcanizing agent is sulfur powder.
In some preferred embodiments of the application, the filler is at least one of N330, V6LP, SPSOLP, and BC 3031.
In some preferred embodiments of the present application, the complexing agent is at least one of zinc oxide, magnesium oxide, and microcrystalline wax.
In some preferred embodiments of the application, the accelerator comprises at least one of MBTS, BZ, TRA and TMTD.
According to still another aspect of the present application, there is provided a method for preparing the above EPDM halogen-free flame retardant rubber, comprising the steps of:
mixing Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber, non-oil-extended EPDM rubber, an organic phosphorus-nitrogen flame retardant and a part of auxiliary agent to obtain a mixed rubber;
and adding the rest auxiliary agent into the rubber compound, carrying out thin-pass, back-refining and vulcanization to obtain the EPDM halogen-free flame retardant rubber.
In some preferred embodiments of the present application, ethylene Propylene Diene Monomer (EPDM) extended crude, organic phosphorus nitrogen flame retardant, inorganic flame retardant auxiliary, filler and compounding agent are mixed to obtain a rubber compound.
In some preferred embodiments of the present application, a vulcanizing agent and an accelerator are added to the rubber compound, and the EPDM halogen-free flame retardant rubber is obtained by thin-pass, reverse-pass, vulcanization.
In some embodiments of the present application, the preparation method of the EPDM halogen-free flame retardant rubber specifically includes the following steps:
adding ethylene-propylene-diene monomer (EPDM) oil-extended raw rubber, non-oil-extended EPDM rubber, an organic phosphorus-nitrogen flame retardant, an inorganic flame retardant auxiliary agent, a filler and a compounding agent into a small rubber internal mixer for mixing to obtain a mixed rubber;
putting the rubber compound into an open mill, adding a vulcanizing agent and an accelerator, and carrying out thin-pass and remilling; and vulcanizing by a flat vulcanizing machine to obtain a test piece or a compression block of the EPDM halogen-free flame retardant rubber.
In some embodiments of the application, the step of mixing is to add Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber and Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber, mix for 40-120 seconds, then add organic phosphorus-nitrogen flame retardant, inorganic flame retardant auxiliary agent, compounding agent and filler, mix for 120-240 seconds, clean the mixing chamber, continue mixing to 90-120 ℃ to obtain the mixed rubber.
Specifically, after cleaning the mixing chamber, the mixing is continued to 90 ℃, 95 ℃, 100 ℃, 105 ℃, 110 ℃, 115 ℃ or 120 ℃.
The preparation method of the application is simple and does not need secondary vulcanization, and in some embodiments of the application, the vulcanization temperature is 160-180 ℃ and the vulcanization time is 300-800 seconds.
In some preferred embodiments of the application, the temperature of the vulcanization is 165-175 ℃, specifically, 165 ℃, 170 ℃ or 175 ℃.
In some preferred embodiments of the application, the vulcanization time is 6min-10min, and in particular, may be 6min, 7min, 8min, 9min or 10min.
While conventional EPDM flame retardant rubbers generally have a relatively high hardness, good low hardness flame retardant rubbers are relatively difficult to develop due to a number of factors involved, and are also less commercially available. To obtain a flame retardant rubber having both low hardness and good physical properties, it is first necessary to select a suitable matrix. On the one hand, the flame retardant affects the properties of the final rubber due to the dispersibility and processability of the flame retardant, and on the other hand, the flame retardant also has a certain influence on the properties such as hardness and strength of the rubber. According to the application, the Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber and the Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber are taken as the matching matrix, and the organic phosphorus-nitrogen flame retardant is taken as the flame retardant, so that the requirements of lower hardness and higher strength can be met and the synergistic flame retardant effect can be achieved through reasonable proportioning and auxiliary agents. The prepared EPDM halogen-free flame retardant rubber can meet the flame retardant requirement of 0.5mm U94-V0 level under the lower hardness requirement, and the rubber has good processability and mechanical properties. The EPDM halogen-free flame retardant rubber has the characteristic of environmental friendliness, and can meet the environmental protection requirement.
According to still another aspect of the present application, the use of the above EPDM halogen-free flame retardant rubber in electric wires and cables is proposed. The application of the EPDM halogen-free flame retardant rubber prepared by the application can get rid of the application limit of non-environment-friendly flame retardant rubber, and the application range is wider.
In the application, both raw rubber and flame retardant are required to be in proper parts, and the combination of lower hardness, higher strength, good physical properties and excellent flame retardance of the application cannot be met beyond the reasonable range defined by the application (for example, using one oil-extended raw rubber or no oil-extended raw rubber alone).
The application has the following beneficial effects:
1) Compared with the prior rubber compounding technology, the application uses the Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber and the Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber as a compounding substrate, uses the organic phosphorus nitrogen flame retardant as a flame retardant and is assisted by an auxiliary agent, thereby not only meeting the requirements of lower hardness, higher strength and good comprehensive physical properties, but also playing an excellent flame retardant effect of synergistic gain. Under the lower hardness requirement, the prepared EPDM halogen-free flame retardant rubber can reach the level of 0.5mm U94-V0, has good processing performance and physical and mechanical properties, has the characteristics of low smoke, low toxicity, environmental protection and the like, can have wide application market, and creates higher economic benefit.
2) The preparation method is simple and convenient, does not need secondary vulcanization, and is suitable for industrialized mass production.
Detailed Description
The conception and the technical effects produced by the present application will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present application. It is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present application based on the embodiments of the present application. The raw materials used in the application are all conventionally available materials unless otherwise specified; the methods of the present application are known to those skilled in the art unless otherwise indicated.
The preparation methods of the examples and comparative examples of the present application are as follows, wherein the preparation steps of each example and comparative example are the same, except that materials used are different, and the specific parts of the materials used are shown in table 1.
The preparation method of the EPDM halogen-free flame retardant rubber comprises the following specific processes:
(1) The rubber mixing is produced by adopting a small rubber internal mixer, raw rubber is firstly added for banburying for 45 seconds, then a flame retardant, an inorganic flame retardant auxiliary agent, a compounding agent and a filler are added for banburying for 200 seconds, a banburying chamber is cleaned, banburying is continued until the temperature reaches 120 ℃ for rubber discharge, a rubber compound is obtained, and a sheet is placed; then forming roll-wrapping rubber on a small open mill, adding vulcanizing agent and accelerator, cutting left and right, passing through the triangular bag 5 times after finishing taking medicine powder, rolling for 3 times, and discharging to obtain an EPDM halogen-free flame-retardant rubber, and standing; and (5) back refining.
(2) Preparation of test piece: vulcanizing was performed on a 50 ton press using a 2mm mold, a 1mm mold, and a 0.5mm mold, respectively, at 175℃for 8 minutes (sulfur vulcanization, without secondary vulcanization). The desired sample was obtained.
Table 1 examples and comparative examples (unit: parts by weight)
The following is noted: actual trial production is an enlargement of the basic recipe of table 1. Wherein 694 refers to 694 oil-extended raw rubber, wherein 115 parts of 694 oil-extended raw rubber is about 50 parts of oil-extended raw rubber, 175 parts of 694 oil-extended raw rubber is about 75 parts of oil-extended raw rubber, and 140 parts of 694 oil-extended raw rubber is about 60 parts of oil-extended raw rubber; 5740Q means 5740Q is not filled with crude rubber; longsafu 211 is an organophosphorus nitrogen flame retardant Longsafu 211; FR-680 is a halogenated flame retardant available from Jiangsu flame retardant materials technology, inc.
As can be seen from the data in table 1 above:
(1) raw rubber selection: from the comparison of the data of comparative example 2 and example 1, it was found that comparative example 2 uses only 694 oil-extended raw rubber, whereas example 1 uses 694 oil-extended raw rubber and non-oil-extended raw rubber 5470Q together, and the flame retardant effect is completely different; it is evident that the flame retardant effect of example 1 is far better than that of comparative example 2.
(2) And (3) selecting a flame retardant filler: from comparison of the data of comparative example 1 and example 1, it is known that the conventional physical properties of both are substantially good, but the flame retardant RF-680 used in comparative example 1 causes deterioration of the processability of the compound; when the flame retardant RF-680 is used for preparing a sample specimen, the specimen is easy to stick to a mold and is not easy to operate, and the specimen prepared by the flame retardant Longsafu 211 can be easily demolded; in the UL94 flame retardant test, comparative example 1 had a dripping phenomenon (no ignition) during combustion, whereas example 1 had no dripping phenomenon during combustion; the flame retardant test results also show that the flame retardant effect of example 1 can meet the UL94-V0 grade of 0.5mm thickness, which is superior to comparative example 1.
(3) The parts of the flame retardant are selected: from comparison of the data of comparative example 3 and example 1, it is known that the flame retardant effect of the rubber compound is different due to the difference of the filling parts of only the flame retardant Longsafu 211 in the formula; the compound of comparative example 3 had failed to achieve flame retardant effect at 1 mm. The comparison shows that the flame retardant effect of example 1 is far better than that of comparative example 3, which shows that the content of the organic phosphorus-nitrogen flame retardant in the formula is very important.
Further, as can be seen from the analysis of the table above, the EPDM halogen-free flame retardant rubber prepared in example 2 has lower hardness, and can have better physical properties and reach high-grade 0.5mm ul94-V0.
In conclusion, under the lower hardness requirement, the flame retardant effect of the combination of the rubber 649 oil-filled raw rubber and the 5470Q oil-filled raw rubber is better; the flame retardant Longsafu 211 is selected to achieve better effect in consideration of the processability of the sizing material and the flame retardant effect; the amount of the flame retardant Longsafu 211 is preferably 110 to 155 parts.
Compared with the prior rubber compounding technology, the application uses the Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber and the Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber as a compounding substrate, uses the organic phosphorus-nitrogen flame retardant as a flame retardant and is assisted by an auxiliary agent, has the characteristics of low smoke, low toxicity, environmental protection and the like, and has good physical and mechanical properties. Along with the continuous development of the industrial level, the application of the EPDM flame-retardant material is increasingly wide, and the novel EPDM halogen-free flame-retardant rubber has the characteristic of being friendly to the environment, can meet the environmental protection requirement, has wide application market and creates higher economic benefit.
While the embodiments of the present application have been described in detail, the present application is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present application within the knowledge of those skilled in the art. Furthermore, embodiments of the application and features of the embodiments may be combined with each other without conflict.

Claims (8)

1. The EPDM halogen-free flame retardant rubber is characterized by comprising the following components in parts by weight:
110-155 parts of Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber;
15-40 parts of non-oil-filled ethylene propylene diene monomer;
110-160 parts of organic phosphorus-nitrogen flame retardant; and
19-52 parts of auxiliary agent;
the organophosphorus nitrogen flame retardant is Longsafu 211 flame retardant.
2. The EPDM halogen-free flame retardant rubber of claim 1, wherein the ethylene propylene diene monomer extended crude is 694 extended crude; the non-oil-filled ethylene propylene diene monomer raw rubber is 5740Q non-oil-filled raw rubber.
3. The EPDM halogen-free flame retardant rubber of claim 1, wherein the auxiliary comprises, by weight, 5-20 parts of an inorganic flame retardant auxiliary, 1-2 parts of a vulcanizing agent, 5-15 parts of a filler, 5-10 parts of a compounding agent, and 3-5 parts of an accelerator.
4. The EPDM halogen-free flame retardant rubber of claim 3, wherein the inorganic flame retardant auxiliary is at least one of magnesium hydroxide and aluminum hydroxide; the filler is at least one of N330, V6LP, SPSOLP and BC 3031; the complexing agent is at least one of zinc oxide, magnesium oxide and microcrystalline wax; the vulcanizing agent is sulfur powder; the promoter is at least one of MBTS, BZ, TRA and TMTD.
5. The method for producing an EPDM halogen-free flame retardant rubber as claimed in any one of claims 1 to 4, comprising the steps of:
mixing Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber, non-oil-extended EPDM rubber, an organic phosphorus-nitrogen flame retardant and a part of auxiliary agent to obtain a mixed rubber;
adding the rest auxiliary agent into the rubber compound, carrying out thin-pass, back-refining and vulcanization to obtain the EPDM halogen-free flame retardant rubber;
the part of auxiliary agents comprise inorganic flame retardant auxiliary agents, fillers and complexing agents; the remaining auxiliary agents include vulcanizing agents and accelerators.
6. The method for preparing the EPDM halogen-free flame retardant rubber according to claim 5, wherein the mixing step is to add Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber and Ethylene Propylene Diene Monomer (EPDM) oil-extended raw rubber, carry out banburying for 40-120 seconds, then add an organic phosphorus-nitrogen flame retardant, an inorganic flame retardant auxiliary agent, a compounding agent and a filler, carry out banburying for 120-240 seconds, clean a banburying chamber, and continue banburying to 90-120 ℃ to obtain the rubber compound.
7. The method for producing a halogen-free flame retardant EPDM rubber of claim 5, wherein the temperature of vulcanization is 160 ℃ -180 ℃; the vulcanization time is 300 seconds to 800 seconds.
8. Use of the EPDM halogen-free flame retardant rubber as defined in any one of claims 1 to 4 in electric wire and cable.
CN202210111324.7A 2022-01-29 2022-01-29 EPDM halogen-free flame retardant rubber and preparation method thereof Active CN114516989B (en)

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CN103435914A (en) * 2013-07-30 2013-12-11 长城汽车股份有限公司 Joint glue for corner part of sealing strip for car door and preparation method
CN104650383A (en) * 2014-12-23 2015-05-27 上海懋通实业有限公司 Special halogen-free composite flame retardant for rubber and preparation method of flame retardant

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