CN114573919A - Flame-retardant environment-friendly light-color food-grade ethylene propylene diene monomer rubber composition and preparation method thereof - Google Patents
Flame-retardant environment-friendly light-color food-grade ethylene propylene diene monomer rubber composition and preparation method thereof Download PDFInfo
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- CN114573919A CN114573919A CN202210130500.1A CN202210130500A CN114573919A CN 114573919 A CN114573919 A CN 114573919A CN 202210130500 A CN202210130500 A CN 202210130500A CN 114573919 A CN114573919 A CN 114573919A
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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
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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
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
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Abstract
The invention discloses a flame-retardant environment-friendly light-color food-grade ethylene propylene diene monomer composition which is prepared from the following raw materials in parts by weight: 100 parts of ethylene propylene diene monomer, 2-4 parts of active zinc oxide, 1-3 parts of stearic acid, 10-20 parts of white carbon black, 10-20 parts of titanium dioxide, 40-60 parts of reinforcing agent, 10-20 parts of magnesium hydroxide, 40-60 parts of phosphorus-nitrogen compound flame retardant, 2-5 parts of silane coupling agent, 15-30 parts of paraffin-based plasticizer, 1-2 parts of sulfur, 4-7 parts of comprehensive accelerator and 1-2 parts of antibacterial agent. The invention adopts paraffin-based plasticizer, takes the mixture of thiazole, dithiophosphate and basic accelerator as comprehensive accelerator, and adds phosphorus-nitrogen complex flame retardant and antibacterial agent, and the prepared ethylene propylene diene rubber product not only has excellent physical and mechanical properties, but also is flame-retardant and free of pungent smell, and meets the requirements of food grade of the product.
Description
Technical Field
The invention belongs to the field of rubber, relates to a flame-retardant food-grade environment-friendly formula applied to rubber products, and particularly relates to a flame-retardant environment-friendly light-color food-grade ethylene propylene diene monomer rubber composition and a preparation method thereof.
Background
Ethylene Propylene Diene Monomer (EPDM) has excellent heat distortion resistance, aging resistance, chemical resistance and electrical insulation, and is widely applied to various production and living fields. For example, food grade hoses are mainly used for transporting food media such as water, milk, juice, beer, beverage and the like, and the hoses are required to be safe and environment-friendly and cannot pollute the media. In addition, food grade hoses are generally required to withstand higher temperatures because they typically require high temperature sterilization and steam sterilization during use. The high-speed rail drinking water pipe is used as a hose for supplying water to a drinking water tank on a high-speed rail, is used for connecting the water pipe with the drinking water tank, and not only meets the requirements, but also has flame retardant performance. However, like most high polymer materials, ethylene propylene diene monomer is also easy to burn, and the pure rubber oxygen index is only about 19, so that the performance requirements can not be met simultaneously in many cases. It is very important to solve the above problems.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a flame-retardant environment-friendly light-color food-grade ethylene propylene diene monomer rubber composition and a preparation method thereof.
The purpose of the invention is realized by the following technical scheme:
a flame-retardant environment-friendly light-color food-grade ethylene propylene diene monomer composition is prepared from the following raw materials in parts by weight: 100 parts of ethylene propylene diene monomer, 2-4 parts of active zinc oxide, 1-3 parts of stearic acid, 10-20 parts of white carbon black, 10-20 parts of titanium dioxide, 40-60 parts of reinforcing agent, 10-20 parts of magnesium hydroxide, 40-60 parts of phosphorus-nitrogen compound flame retardant, 2-5 parts of silane coupling agent, 15-30 parts of paraffin-based plasticizer, 1-2 parts of sulfur, 4-7 parts of comprehensive accelerator and 1-2 parts of antibacterial agent.
Preferably, the flame-retardant environment-friendly light-color food-grade ethylene propylene diene monomer rubber composition is prepared from the following raw materials in parts by weight: 100 parts of ethylene propylene diene monomer, 2-4 parts of active zinc oxide, 1-3 parts of stearic acid, 10-20 parts of white carbon black, 10-20 parts of titanium dioxide, 40-60 parts of reinforcing agent, 10-20 parts of magnesium hydroxide, 40-60 parts of phosphorus-nitrogen compound flame retardant, 2-5 parts of silane coupling agent, 20-30 parts of paraffin-based plasticizer, 1-2 parts of sulfur, 4-6 parts of comprehensive accelerator and 1-2 parts of antibacterial agent.
More preferably, the flame-retardant environment-friendly light-color food-grade ethylene propylene diene monomer composition is prepared from the following raw materials in parts by weight: 100 parts of ethylene propylene diene monomer, 2-4 parts of active zinc oxide, 1-3 parts of stearic acid, 10-20 parts of white carbon black, 10-20 parts of titanium dioxide, 40-50 parts of reinforcing agent, 10-20 parts of magnesium hydroxide, 40-50 parts of phosphorus-nitrogen compound flame retardant, 2-5 parts of silane coupling agent, 20-25 parts of paraffin-based plasticizer, 1-2 parts of sulfur, 4-5 parts of comprehensive accelerator and 1-2 parts of antibacterial agent.
The Mooney viscosity ML (1+4) of the ethylene propylene diene monomer is 60-85 at 125 ℃, the ethylene content is 55-70%, and the content of the third monomer ENB is 4-6%.
The reinforcing agent is calcium silicate NC600EST, and is an inorganic acicular mineral.
The nitrogen-phosphorus compound flame retardant is Longsafe 201.
The silane coupling agent is a silane coupling agent A151.
The paraffin-based plasticizer is paraffin oil PIONIER 2071.
The comprehensive accelerator is comprehensive accelerator LHG-80, and the comprehensive accelerator LHG-80 is a mixed comprehensive accelerator of dihexanolide disulfide, dithiophosphate and a basic accelerator.
The deodorant is an antibacterial agent GNCE 5700-T100.
The invention also aims to provide a preparation method of the flame-retardant environment-friendly light-color food-grade ethylene propylene diene monomer rubber composition, which comprises the following steps:
step (1), introducing water into an internal mixer for cooling, controlling the temperature of a working chamber of the internal mixer to be not more than 60 ℃, and firstly mixing ethylene propylene diene monomer, active zinc oxide and stearic acid for 1-2 min; then adding white carbon black, titanium dioxide, a reinforcing agent, a silane coupling agent and a paraffin-based plasticizer, and mixing for 4-6 min; finally, adding magnesium hydroxide and a nitrogen-phosphorus compound flame retardant, and mixing for 2-4 min; closing the internal mixer for cooling, continuously mixing, removing rubber when the temperature of the internal mixer rises to 140 ℃, moving the internal mixer to an open type rubber mixing machine for thin passing and sheet discharging, and cooling to room temperature (20-30 ℃);
step (2), putting the mixture prepared in the step (1) into an internal mixer, adding an antibacterial agent, sulfur and a comprehensive accelerator, mixing, controlling the temperature of a rubber material at 80-100 ℃, mixing for 2-3 min, and moving to an open type rubber mixing mill for thin-pass sheet discharging; standing and stabilizing for 8 hours to obtain an ethylene propylene diene monomer material;
and (3) putting the ethylene propylene diene monomer rubber material into a flat vulcanizing machine for vulcanization to obtain the ethylene propylene diene monomer rubber composition.
In the step (3), the vulcanization temperature is 160 +/-2 ℃, and the vulcanization time is 30 +/-5 min.
The ethylene propylene diene monomer composition does not use carbon black, so that sulfur-containing micromolecular compounds generated in the rubber vulcanization process are greatly reduced. The calcium silicate NC600EST is selected as a filling material, and has the advantages of no toxicity, chemical corrosion resistance, good heat-resistant stability and dimensional stability, low water absorption rate and oil absorption value, and good mechanical property and electrical property. Longsafe 201 is selected as a flame retardant material, and has the advantages of extremely small smoke quantity, no generation of toxic and harmful gases and good self-extinguishing property; secondly, a large amount of the rubber can be added into the light-colored rubber, so that the physical property of the rubber is slightly damaged. The paraffin oil PIONIER 2071 is a medicinal liquid paraffin, a fully saturated hydrocarbon, and has high flash point and high viscosity. The paraffin oil with low aromatic hydrocarbon content can improve the oxidation degradation resistance of the product and can also effectively reduce the smell of rubber. The antibacterial agent GNCE5700-T100 is selected, on one hand, the antibacterial agent can effectively prevent harm caused by microorganisms, so that the added product has the functions of mildew prevention and antibiosis; on the other hand, the addition amount is small, the mildew-proof grade added according to the amount can reach 0 grade, and the high-temperature-resistant anti-mildew agent has good compatibility and dispersibility, long aging time, good thermal stability and resistance to high temperature of 240 ℃.
The invention also aims to provide application of the flame-retardant environment-friendly light-color food-grade ethylene propylene diene monomer rubber composition in preparation of a high-speed railway drinking water pipe.
Compared with the prior art, the invention has the following beneficial effects:
the ethylene propylene diene rubber composition adopts the medicinal liquid paraffin PIONIER 2071 as a plasticizer, and adopts the comprehensive accelerator LHG-80 and the antibacterial agent GNCE5700-T100, so that the prepared ethylene propylene diene rubber product not only has excellent physical and mechanical properties, but also has flame retardance and no pungent smell, and the grade is below 3.5 in a smell experiment, thereby meeting the requirements of a host factory on flame retardance and environment-friendly food-grade rubber pipes.
Detailed Description
The technical solution of the present invention is further illustrated by the following examples.
TABLE 1 formulation of nitrile rubber compositions of examples 1 to 4 and comparative examples 1 to 4 (parts by weight)
Example 1
The flame-retardant and environment-friendly light-color food-grade ethylene propylene diene monomer composition is prepared from the following raw materials in parts by weight shown in Table 1 by the following method:
step (1), introducing water into an internal mixer for cooling, controlling the temperature of a working chamber of the internal mixer to be not more than 60 ℃, and mixing ethylene propylene diene monomer, active zinc oxide and stearic acid for 1-2 min; then adding white carbon black, titanium dioxide, a nano reinforcing agent calcium silicate NC600EST, a silane coupling agent A151 and a paraffin-based plasticizer PIONIER 2071, and mixing for 4-6 min; finally, adding magnesium hydroxide and a nitrogen-phosphorus compound flame retardant Longsafe 201, and mixing for 2-4 min; closing the internal mixer for cooling, continuously mixing, removing rubber when the temperature of the internal mixer rises to 140 ℃, moving the internal mixer to an open type rubber mixing machine for thin passing and sheet discharging, and cooling to room temperature (20-30 ℃);
putting the mixture prepared in the step (1) into an internal mixer, adding an antibacterial agent GNCE5700-T100, sulfur and a comprehensive accelerator LHG-80, mixing, controlling the temperature of rubber materials at 80-100 ℃, mixing for 2-3 min, and moving to an open type rubber mixing mill for thin passing and sheet discharging; standing and stabilizing for 8 hours to obtain an ethylene propylene diene monomer material;
and (3) putting the ethylene propylene diene monomer material into a flat vulcanizing machine, vulcanizing at 160 ℃ for 30min to obtain the ethylene propylene diene monomer composition, wherein the relative performance of the ethylene propylene diene monomer composition reaches the hardness of 60 +/-5 Shore A, and the tensile strength is more than 8 MPa.
Example 2
The flame-retardant and environment-friendly light-color food-grade ethylene propylene diene monomer rubber composition comprises the components in parts by weight shown in Table 1 and is prepared according to the method of example 1.
Example 3
The flame-retardant and environment-friendly light-color food-grade ethylene propylene diene monomer rubber composition comprises the components in parts by weight shown in Table 1 and is prepared according to the method of example 1.
Comparative example 1
An ethylene-propylene-diene monomer rubber composition was prepared by the method of example 1, wherein the types of accelerators were adjusted on the basis of example 2, and the components and parts by weight thereof are shown in table 1.
Comparative example 2
An ethylene propylene diene monomer composition is prepared by the method of example 1 without adding an antibacterial agent on the basis of example 2, and the components and parts by weight of the composition are shown in table 1.
Comparative example 3
The ethylene propylene diene rubber composition is prepared by adjusting the flame retardant type on the basis of the ethylene propylene diene rubber composition in example 2, wherein the components and the parts by weight of the ethylene propylene diene rubber composition are shown in the table 1 and are prepared according to the method in example 1.
Comparative example 4
An ethylene-propylene-diene monomer rubber composition was prepared by the method of example 1, wherein the types of fillers were adjusted based on example 2, and the components and parts by weight thereof are shown in table 1.
The ethylene-propylene-diene monomer rubber products prepared in examples 1 to 3 and comparative examples 1 to 4 were tested according to the test standards GB/T531.1-2008 and GB/T5750-2006, and the results are shown in Table 2.
TABLE 2 Performance parameters of the ethylene-propylene-diene rubber compositions of examples 1-3 and comparative examples 1-4
And (4) analyzing results: the data in table 2 show that the technical indexes of the ethylene propylene diene monomer composition completely meet the technical index requirements, the grade is below 3.5 in a smell experiment, the oxygen index in the flame retardant property is more than 25%, and the smoke density and the smoke toxicity are less than the technical indexes.
Claims (10)
1. A flame-retardant environment-friendly light-color low-odor food-grade ethylene propylene diene monomer composition is characterized in that: the composite material is prepared from the following raw materials in parts by weight: 100 parts of ethylene propylene diene monomer, 2-4 parts of active zinc oxide, 1-3 parts of stearic acid, 10-20 parts of white carbon black, 10-20 parts of titanium dioxide, 40-60 parts of reinforcing agent, 10-20 parts of magnesium hydroxide, 40-60 parts of phosphorus-nitrogen compound flame retardant, 2-5 parts of silane coupling agent, 15-30 parts of paraffin-based plasticizer, 1-2 parts of sulfur, 4-7 parts of comprehensive accelerator and 1-2 parts of antibacterial agent.
2. The flame retardant, environmentally friendly, light colored, low odor food grade ethylene propylene diene rubber composition of claim 1, wherein: the composite material is prepared from the following raw materials in parts by weight: 100 parts of ethylene propylene diene monomer, 2-4 parts of active zinc oxide, 1-3 parts of stearic acid, 10-20 parts of white carbon black, 10-20 parts of titanium dioxide, 40-60 parts of reinforcing agent, 10-20 parts of magnesium hydroxide, 40-60 parts of phosphorus-nitrogen compound flame retardant, 2-5 parts of silane coupling agent, 20-30 parts of paraffin-based plasticizer, 1-2 parts of sulfur, 4-6 parts of comprehensive accelerator and 1-2 parts of antibacterial agent.
3. The flame retardant, environmentally friendly, light-colored, low odor food grade ethylene propylene diene rubber composition of claim 2, wherein: the flame-retardant environment-friendly light-color food-grade ethylene propylene diene monomer composition is prepared from the following raw materials in parts by weight: 100 parts of ethylene propylene diene monomer, 2-4 parts of active zinc oxide, 1-3 parts of stearic acid, 10-20 parts of white carbon black, 10-20 parts of titanium dioxide, 40-50 parts of reinforcing agent, 10-20 parts of magnesium hydroxide, 40-50 parts of phosphorus-nitrogen compound flame retardant, 2-5 parts of silane coupling agent, 20-25 parts of paraffin-based plasticizer, 1-2 parts of sulfur, 4-5 parts of comprehensive accelerator and 1-2 parts of antibacterial agent.
4. The flame retardant, environmentally friendly, light colored, low odor food grade ethylene propylene diene rubber composition of claim 1, wherein: the Mooney viscosity ML (1+4) of the ethylene propylene diene monomer is 60-85 at 125 ℃, the ethylene content is 55-70%, and the ENB content of the third monomer is 4-6%.
5. The flame retardant, environmentally friendly, light-colored, low odor food grade ethylene propylene diene rubber composition of claim 1, wherein: the reinforcing material is calcium silicate NC600 EST;
the nitrogen-phosphorus compound flame retardant is a nitrogen-phosphorus compound flame retardant Longsafe 201.
6. The flame retardant, environmentally friendly, light colored, low odor food grade ethylene propylene diene rubber composition of claim 1, wherein: the paraffin-based plasticizer is paraffin oil PIONIER 2071;
the comprehensive accelerator is LHG-80.
7. The flame retardant, environmentally friendly, light colored, low odor food grade ethylene propylene diene rubber composition of claim 1, wherein: the antibacterial agent is an antibacterial agent GNCE 5700-T100.
8. A method for preparing the flame-retardant, environmentally-friendly, light-colored, low-odor food-grade ethylene propylene diene rubber composition of claim 1, which is characterized in that: the method comprises the following steps:
step (1), introducing water into an internal mixer for cooling, controlling the temperature of a working chamber of the internal mixer to be not more than 60 ℃, and firstly mixing ethylene propylene diene monomer rubber, active zinc oxide and stearic acid for 1-2 min; then adding white carbon black, titanium dioxide, a reinforcing agent, a silane coupling agent and a paraffin-based plasticizer, and mixing for 4-6 min; finally, adding magnesium hydroxide and a nitrogen-phosphorus compound flame retardant, and mixing for 2-4 min; closing the internal mixer for cooling, continuing to mix, discharging when the temperature of the internal mixer rises to 140 ℃, moving to an open type rubber mixing machine for thin passing and sheet discharging, and cooling to room temperature;
putting the mixture prepared in the step (1) into an internal mixer, adding an antibacterial agent, sulfur and a comprehensive accelerator for mixing, controlling the temperature of a rubber material to be 80-100 ℃, mixing for 2-3 min, and moving the rubber material to an open type rubber mixing machine for thin passing and sheet discharging; standing and stabilizing for 8 hours to obtain an ethylene propylene diene monomer material;
and (3) putting the ethylene propylene diene monomer rubber material into a flat vulcanizing machine for vulcanization to obtain the ethylene propylene diene monomer rubber composition.
9. The method for preparing the flame-retardant, environmentally-friendly, light-colored, low-odor food-grade ethylene propylene diene rubber composition according to claim 8, wherein the flame-retardant, environmentally-friendly, light-colored, low-odor food-grade ethylene propylene diene rubber composition comprises the following steps: in the step (3), the vulcanization temperature is 160 +/-2 ℃, and the vulcanization time is 30 +/-5 min.
10. Use of the flame retardant, environmentally friendly light colored food grade ethylene propylene diene monomer rubber composition of claim 1 in the preparation of high iron drinking water pipe.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115073829A (en) * | 2022-08-02 | 2022-09-20 | 东莞市利群榕兴高分子科技有限公司 | Flame-retardant insulating composite rubber material and preparation method thereof |
| CN116003917A (en) * | 2022-11-10 | 2023-04-25 | 南京利德东方橡塑科技有限公司 | Environment-friendly oil-resistant ethylene propylene rubber composition for light-colored rubber tubes and preparation method thereof |
| CN117700625A (en) * | 2023-12-19 | 2024-03-15 | 东莞市厚铧橡胶科技有限公司 | Rubber for toy tire and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117700625A (en) * | 2023-12-19 | 2024-03-15 | 东莞市厚铧橡胶科技有限公司 | Rubber for toy tire and preparation method thereof |
| CN117700625B (en) * | 2023-12-19 | 2024-05-10 | 东莞市厚铧橡胶科技有限公司 | Rubber for toy tire and preparation method thereof |
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