CN111925600A - Ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip and production method thereof - Google Patents
Ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip and production method thereof Download PDFInfo
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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
- 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
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- 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
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- 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
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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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
- C08L2312/00—Crosslinking
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- Polymers & Plastics (AREA)
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Abstract
The invention relates to an ethylene propylene diene flame-retardant fire-encountering expansion sealing strip and a production method thereof, wherein the ethylene propylene diene flame-retardant fire-encountering expansion sealing strip realizes flame retardance on the combustion of materials through three flame-retardant mechanisms, namely a gas-phase flame-retardant mechanism, a condensed-phase flame-retardant mechanism and a heat exchange interruption mechanism; the application of the anti-aging agent ensures that the ethylene propylene diene rubber material keeps the inherent heat resistance of molecular cross-linking bonds to the maximum extent, thereby increasing the forming difficulty of active free radicals and exerting the oxidation and aging resistance of the obtained ethylene propylene diene rubber product to the maximum extent; the expandable graphite is used as an intumescent flame retardant and is added into a rubber product, so that the rubber product has the damage resistance and higher expansion rate under the action of the expandable graphite when meeting high temperature, and the aim of better flame retardance is fulfilled.
Description
Technical Field
The invention relates to the technical field of rubber sealing materials, in particular to an ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip and a production method thereof.
Background
The third monomer diene is introduced into the ethylene propylene diene monomer, so that the unsaturation of a molecular chain structure is increased, sulfur vulcanization is realized, and the application range of the ethylene propylene rubber is greatly expanded. The ethylene propylene diene is rubber with low density, and the relative density of the ethylene propylene diene is 0.860-0.870, which means that the ethylene propylene diene has larger filling property than other rubbers, and is beneficial to reducing the material cost of products. Most of the synthetic rubbers on the market are flammable or inflammable, and like other flammable polymer materials, the improvement of the flame retardancy of the rubber is an increasingly urgent requirement for the application of the rubber and rubber products.
Because rubber and various additives have better compatibility than plastics, the flame retardant modification of rubber by adding various flame retardants and various flame retardant fillers is still the main means of flame retardation of the rubber at present. The intumescent flame retardant prevents the material from further burning by utilizing the carbon deposit effect generated on the surface of the material, thereby limiting the heat release speed and minimizing the heat, the toxic gas quantity and the corrosive gas quantity.
The expandable graphite is used as an intumescent flame retardant in the production of rubber sealing strips, can absorb a large amount of heat in the expansion process, is low in smoke, non-toxic, high in performance and environment-friendly, and the expandable graphite enables the ethylene propylene diene monomer sealing strips to be more plastic, more ductile and better in sealing property and effectively prevents the spread and expansion of fire.
However, the effect of adding a single type of flame retardant into the existing ethylene propylene diene sealing strip is not good, and the production requirement cannot be met, so that the expansion flame retardance of the sealing strip in fire at high temperature needs to be effectively improved, and the good fireproof and flame retardant effects are achieved.
Disclosure of Invention
The invention aims to provide an ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip which has the advantages of ageing resistance, weather resistance, high tensile strength, good extensibility, good rebound resilience, good high and low temperature resistance, good flame retardance and the like, meets the basic performance requirements of the sealing strip, is simple in production process, effectively improves the expansion flame retardance of the sealing strip in high-temperature fire encountering and achieves the good effects of fire prevention and flame retardance.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: an ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip comprises the following raw materials in parts by weight:
preferably, the flame retardant comprises the following components in percentage by weight: 40% of aluminum hydroxide, 25% of zinc borate, 25% of antimony trioxide and 10% of bromine-containing flame retardant.
Preferably, the accelerator comprises the following components in percentage by weight: 30% of 2-mercaptobenzothiazole, 30% of zinc dibutyldithiocarbamate, 20% of dipentamethylenethiuram tetrasulfide, 10% of zinc dibutyldithiocarbamate, 10% of zinc dimethyldithiocarbamate and 10% of zinc diethyldithiocarbamate.
Preferably, the combination and content of the anti-aging agent are as follows: 40% of styrenated phenol, 40% of 2-mercaptobenzimidazole and 20% of 2-mercaptotoluimidazole.
The invention also aims to provide a production method of the ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip, which comprises the following steps:
(1) preparing materials: and respectively weighing the main materials and the auxiliary materials according to the formula.
(2) Banburying: and (3) putting the weighed main materials into an internal mixer for internal mixing, adjusting the pressure of the internal mixer to be 1.0-1.2MPa, adjusting the internal mixing time to be 15 minutes, and discharging when the internal mixing temperature reaches 170 ℃.
(3) And (3) filtering: and (3) putting the banburying rubber obtained by banburying into a rubber filter for filtering, and filtering out impurities in the banburying rubber for 6-7 minutes.
(4) Mixing: and (3) standing and cooling the filtered banburying rubber, and storing for more than 24 hours after cooling. Adding auxiliary materials into an internal mixer, mixing for 1.5-2 minutes at the temperature of 50-60 ℃, and discharging rubber.
(5) Tabletting: and cooling the banburying rubber pressing sheet on an open mill, wherein the gap between the rolls is 9mm, the thickness of the sheet is 10mm-12mm, and the width of the sheet is 100mm-120 mm.
(6) Extruding: the temperature of a screw of the extruder is set to be 40 ℃, the temperature of a feeding area is 50 ℃, the temperature of a second area is 60 ℃, the temperature of a third area is 60 ℃, the temperature of a machine head is 60 ℃, the extrusion speed is 10-50 r/min, and the product is produced according to a designed die.
(7) And (3) vulcanization: adopts a microwave heating or hot air mode, the vulcanization temperature is set to be 160-180 ℃, and the long-time low-temperature vulcanization is carried out.
(8) And (3) cooling: and cooling the vulcanized product through a cold water tank.
(9) And (5) dragging, coiling and packaging to obtain a finished product.
Wherein, the main materials in the step (1) are as follows: ethylene propylene diene monomer; a flame retardant; paraffin oil; white carbon black; calcium powder; zinc oxide, PEG-4000, stearic acid. The auxiliary materials are as follows: graphite; an accelerator; sulfur; an anti-aging agent; dithiodimorpholine.
The effectiveness of adopting the technical scheme has the following points:
(1) the composite flame-retardant system is applied to realize flame retardance of the material by three flame-retardant mechanisms, namely a gas-phase flame-retardant mechanism, a condensed-phase flame-retardant mechanism and a heat-exchange interruption mechanism. The environment-friendly flame retardants such as aluminum hydroxide, zinc borate and antimony trioxide and other fillers are fully mixed on a mixing roll to be uniformly distributed, and the utilization rate of the flame retardants is improved under the synergistic action of a plurality of flame retardants, so that the ethylene propylene diene monomer rubber product with good flame retardance is obtained.
(2) The application of the anti-aging agent ensures that the ethylene propylene diene rubber material keeps the inherent heat resistance of molecular cross-linking bonds to the maximum extent, thereby increasing the forming difficulty of active free radicals and giving full play to the oxidation and aging resistance of the obtained ethylene propylene diene rubber product.
(3) The expandable graphite is used as an intumescent flame retardant and is added into a rubber product, so that the rubber product has the damage resistance and higher expansion rate under the action of the expandable graphite when meeting high temperature, and the aim of better flame retardance is fulfilled.
Detailed Description
Example 1:
an ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip comprises the following raw materials in parts by weight:
the production method of the ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip comprises the following steps:
(1) preparing materials: and respectively weighing the main materials and the auxiliary materials according to the formula.
(2) Banburying: and (3) putting the weighed main materials into an internal mixer for internal mixing, adjusting the pressure of the internal mixer to be 1MPa, adjusting the internal mixing time to be 15 minutes, and discharging the rubber when the internal mixing temperature reaches 170 ℃.
(3) And (3) filtering: and (3) putting the banburying rubber obtained by banburying into a rubber filter for filtering, and filtering out impurities in the banburying rubber for 6 minutes.
(4) Mixing: and (3) standing and cooling the filtered banburying rubber, and storing for more than 24 hours after cooling. Adding auxiliary materials into an internal mixer, mixing for 1.5 minutes at the temperature of 50 ℃ and then discharging rubber.
(5) Tabletting: and cooling the banburying rubber pressing sheet on an open mill, wherein the gap between the rolls is 9mm, the thickness of the sheet is 10mm, and the width of the sheet is 100 mm.
(6) Extruding: the temperature of a screw of the extruder is set to be 40 ℃, the temperature of a feeding area is 50 ℃, the temperature of a second area is 60 ℃, the temperature of a third area is 60 ℃, the temperature of a machine head is 60 ℃, the extrusion speed is 30 r/min, and products are produced according to a designed die.
(7) And (3) vulcanization: adopting microwave heating or hot air mode, setting vulcanization temperature at 180 deg.C, and vulcanizing at low temperature for a long time.
(8) And (3) cooling: and cooling the vulcanized product through a cold water tank.
(9) And (5) dragging, coiling and packaging to obtain a finished product.
Example 2:
an ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip comprises the following raw materials in parts by weight:
the production method of the ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip comprises the following steps:
(1) preparing materials: and respectively weighing the main materials and the auxiliary materials according to the formula.
(2) Banburying: and (3) putting the weighed main materials into an internal mixer for internal mixing, adjusting the pressure of the internal mixer to be 1.2MPa, adjusting the internal mixing time to be 15 minutes, and discharging the rubber when the internal mixing temperature reaches 170 ℃.
(3) And (3) filtering: and (3) putting the banburying rubber obtained by banburying into a rubber filter for filtering, and filtering out impurities in the banburying rubber for 7 minutes.
(4) Mixing: and (3) standing and cooling the filtered banburying rubber, and storing for more than 24 hours after cooling. Adding auxiliary materials into an internal mixer, mixing for 2 minutes at the temperature of 60 ℃ and then discharging rubber.
(5) Tabletting: and cooling the banburying rubber pressing sheet on an open mill, wherein the gap between the rolls is 9mm, and the sheet is 12mm in thickness and 120mm in width.
(6) Extruding: the temperature of a screw of the extruder is set to be 40 ℃, the temperature of a feeding area is 50 ℃, the temperature of a second area is 60 ℃, the temperature of a third area is 60 ℃, the temperature of a machine head is 60 ℃, the extrusion speed is 40 r/min, and products are produced according to a designed die.
(7) And (3) vulcanization: adopting microwave heating or hot air mode, setting the vulcanization temperature at 160 deg.C, and vulcanizing at low temperature for a long time.
(8) And (3) cooling: and cooling the vulcanized product through a cold water tank.
(9) And (5) dragging, coiling and packaging to obtain a finished product.
Example 3:
an ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip comprises the following raw materials in parts by weight:
the production method of the ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip comprises the following steps:
(1) preparing materials: and respectively weighing the main materials and the auxiliary materials according to the formula.
(2) Banburying: and (3) putting the weighed main materials into an internal mixer for internal mixing, adjusting the pressure of the internal mixer to be 1.2MPa, adjusting the internal mixing time to be 15 minutes, and discharging the rubber when the internal mixing temperature reaches 170 ℃.
(3) And (3) filtering: and (3) putting the banburying rubber obtained by banburying into a rubber filter for filtering, and filtering out impurities in the banburying rubber for 7 minutes.
(4) Mixing: and (3) standing and cooling the filtered banburying rubber, and storing for more than 24 hours after cooling. Adding auxiliary materials into an internal mixer, mixing for 2 minutes at the temperature of 60 ℃ and then discharging rubber.
(5) Tabletting: and cooling the banburying rubber press sheet on an open mill, wherein the gap between the rolls is 9mm, and the thickness and the width of the sheet are 11mm and 110 mm.
(6) Extruding: the temperature of a screw of the extruder is set to be 40 ℃, the temperature of a feeding area is 50 ℃, the temperature of a second area is 60 ℃, the temperature of a third area is 60 ℃, the temperature of a machine head is 60 ℃, the extrusion speed is 50 revolutions per minute, and products are produced according to a designed die.
(7) And (3) vulcanization: adopting microwave heating or hot air mode, setting the vulcanization temperature at 170 deg.C, and vulcanizing at low temperature for a long time.
(8) And (3) cooling: and cooling the vulcanized product through a cold water tank.
(9) And (5) dragging, coiling and packaging to obtain a finished product.
The performance parameters of the sealing tapes produced in the examples are shown in Table 1 below
TABLE 1 Property parameters of sealing tapes of examples
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip is characterized by comprising the following raw materials in parts by weight:
2. the ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip as claimed in claim 1, which is characterized by comprising the following raw materials in parts by weight:
3. the ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip as claimed in claim 1, which is characterized by comprising the following raw materials in parts by weight:
4. the ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip as claimed in claim 1, which is characterized by comprising the following raw materials in parts by weight:
5. the ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip as claimed in claim 1, wherein the flame retardant comprises the following components in percentage by weight: 40% of aluminum hydroxide, 25% of zinc borate, 25% of antimony trioxide and 10% of bromine-containing flame retardant.
6. The ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip as claimed in claim 1, wherein the accelerator comprises the following components in percentage by weight: 30% of 2-mercaptobenzothiazole, 30% of zinc dibutyldithiocarbamate, 20% of dipentamethylenethiuram tetrasulfide, 10% of zinc dibutyldithiocarbamate, 10% of zinc dimethyldithiocarbamate and 10% of zinc diethyldithiocarbamate.
7. The ethylene propylene diene monomer flame-retardant fire-encountering expansion sealing strip as claimed in claim 1, wherein the combination and content of the anti-aging agents are as follows: 40% of styrenated phenol, 40% of 2-mercaptobenzimidazole and 20% of 2-mercaptotoluimidazole.
8. A production method for preparing the ethylene propylene diene monomer flame-retardant fire-expansion sealing strip as claimed in any one of claims 1 to 7 comprises the following steps:
(1) preparing materials: respectively weighing the main materials and the auxiliary materials according to the formula;
(2) banburying: putting the weighed main materials into an internal mixer for internal mixing, adjusting the pressure of the internal mixer to be 1.0-1.2MPa, adjusting the internal mixing time to be 15 minutes, and discharging when the internal mixing temperature reaches 170 ℃;
(3) and (3) filtering: putting the banburying rubber obtained by banburying into a rubber filter for filtering, and filtering out impurities in the banburying rubber for 6-7 minutes;
(4) mixing: standing and cooling the filtered banburying rubber, and storing for more than 24 hours after cooling; adding auxiliary materials into an internal mixer, mixing for 1.5-2 minutes at the temperature of 50-60 ℃, and then discharging rubber;
(5) tabletting: cooling the banburying rubber pressing sheet on an open mill, wherein the gap between the rolls is 9mm, the thickness of the sheet is 10mm-12mm, and the width of the sheet is 100mm-120 mm;
(6) extruding: setting the temperature of a screw of the extruder to be 40 ℃, the temperature of a feeding area to be 50 ℃, the temperature of a second area to be 60 ℃, the temperature of a third area to be 60 ℃, the temperature of a machine head to be 60 ℃ and the extrusion speed to be 10-50 r/min, and discharging a product according to a designed die;
(7) and (3) vulcanization: adopting a microwave heating or hot air mode, setting the vulcanization temperature at 160-180 ℃, and carrying out low-temperature vulcanization for a long time;
(8) and (3) cooling: cooling the vulcanized product through a cold water tank;
(9) and (5) dragging, coiling and packaging to obtain a finished product.
9. The production method according to claim 8, wherein the main materials in the step (1) are: ethylene propylene diene monomer; a flame retardant; paraffin oil; white carbon black; calcium powder; zinc oxide, PEG-4000, stearic acid; the auxiliary materials are as follows: graphite; an accelerator; sulfur; an anti-aging agent; dithiodimorpholine.
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| CN114350163A (en) * | 2022-02-10 | 2022-04-15 | 江苏同盟汽车零部件实业有限公司 | 2D expansion rubber strip for automobile sealing and preparation method thereof |
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| CN103435920A (en) * | 2013-09-06 | 2013-12-11 | 威县亚泰密封件有限公司 | Method for producing recycled-ethylene-propylene-terpolymer-rubber seal strip |
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| CN114350163A (en) * | 2022-02-10 | 2022-04-15 | 江苏同盟汽车零部件实业有限公司 | 2D expansion rubber strip for automobile sealing and preparation method thereof |
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