CN112625369A - Environment-friendly high-flame-retardant EVM, high styrene resin and EPDM ternary blending secondary foaming material and preparation method thereof - Google Patents
Environment-friendly high-flame-retardant EVM, high styrene resin and EPDM ternary blending secondary foaming material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an environment-friendly high flame-retardant EVM, high styrene resin and EPDM ternary blending secondary foaming material and a preparation method thereof, wherein the environment-friendly high flame-retardant EVM, high styrene resin and EPDM ternary blending secondary foaming material comprises 100 parts of mixed glue C, 26-31 parts of softener paraffin oil, 2-3 parts of accelerator DM, 8-10 parts of foaming agent, 4-6 parts of sulfur and 1-2 parts of odorless DCP; the mixed glue C comprises: 100 parts of premixed rubber B, 700150 parts of ethylene propylene diene monomer, 3-5 parts of stearic acid, 6-9 parts of zinc stearate, 21-25 parts of zinc oxide, 150 parts of flame retardant, 125 parts of carbon black 105-; the pre-mixed glue B comprises: 100 parts of premixed rubber A, 7001100 parts of ethylene propylene diene monomer rubber and 3-5 parts of stearic acid; the pre-mixed glue A comprises: 10 parts of EVM, 80 parts of high styrene resin, 3-5 parts of stearic acid, 10-15 parts of heat-resistant agent nano cerium oxide JC-Ce0A 10 and 10-15 parts of pyrolysis stabilizer N-phenyl maleimide (NPMI); the finished product prepared by the method can meet the requirement of high flame retardance of UL94v0 grade under the thickness of 1 mm.
Description
Technical Field
The invention relates to the technical field of foaming materials, in particular to an environment-friendly high-flame-retardant EVM, high styrene resin and EPDM ternary blending secondary foaming material and a preparation method thereof.
Background
There is also a need in particular for excellent flame retardant properties. The physical properties of the existing EVM, high styrene resin and EPDM blended foaming materials generally need to be thicker to achieve the flame retardant effect, and the physical properties of the materials which meet the high flame retardant requirement of UL94v0 grade under the thickness of 1mm do not appear in the market at present. Therefore, if a foaming material meeting the market demand is prepared on the premise of controlling the production cost, ensuring the product performance and meeting the ROHS international environmental protection requirements, the problem to be solved is urgently needed at present.
Disclosure of Invention
The embodiment of the application solves the technical problem that the foamed material in the prior art cannot achieve flame retardance at the thickness of 1mm by providing the environment-friendly high-flame-retardant EVM, high styrene resin and EPDM ternary blending secondary foamed material and the preparation method thereof, and realizes the preparation of the environment-friendly high-flame-retardant EVM, high styrene resin and EPDM ternary blending secondary foamed material which can achieve the requirement of UL94v0 grade at the thickness of 1 mm.
The embodiment of the application provides an environment-friendly high-flame-retardant EVM, high styrene resin and EPDM ternary blending secondary foaming material, which comprises
Mixed rubber C100 parts
26 to 31 portions of softening agent paraffin oil
2 to 3 portions of accelerant DM
8 to 10 portions of foaming agent
4 to 6 portions of sulfur
Odorless DCP 1-2 parts
The mixed glue C comprises:
100 portions of premixed rubber B
700150 parts of ethylene propylene diene monomer
Stearic acid 3-5 parts
6-9 parts of zinc stearate
21 to 25 portions of zinc oxide
150-170 parts of flame retardant
105-125 parts of carbon black
50-80 parts of magnesium hydroxide
Polyethylene glycol 1-2 parts
The pre-mixed glue B comprises: 100 parts of premixed rubber A, 7001100 parts of ethylene propylene diene monomer rubber and 3-5 parts of stearic acid;
the pre-mixed glue A comprises: 10 parts of EVM, 80 parts of high styrene resin, 3-5 parts of stearic acid, 10-15 parts of heat-resistant agent nano cerium oxide JC-Ce0A 10 and 10-15 parts of pyrolysis stabilizer N-phenyl maleimide (NPMI).
A preparation method of an environment-friendly high-flame-retardant EVM, high styrene resin and EPDM ternary blending secondary foaming material comprises the following steps:
the method comprises the following steps: putting EVM, high styrene resin, heat-resistant agent nanometer cerium oxide JC-Ce0A, pyrolysis stabilizer N-phenyl maleimide (NPMI) and 3-5 parts of stearic acid into an internal mixer, pressurizing and kneading, continuously filling cold water for cooling in the kneading process, and discharging when the temperature reaches 150 +/-5 ℃;
step two: putting the rubber material obtained in the step one into an open mill, controlling the temperature at 110 +/-5 ℃, turning the material for 180 seconds at the thickness of 5mm, and cutting the material into corresponding weight by fluttering the material with the thickness of 2mm to be respectively kept stand;
step three: putting the rubber material obtained in the step two into an open mill for calendering and thin passing, controlling the temperature to be 85 +/-5 ℃, standing and cooling to obtain pre-mixed rubber A;
step four: putting the premixed rubber A, EPDM-7001, stearic acid and zinc stearate into an internal mixer, pressurizing and kneading, continuously filling cold water for cooling in the kneading process, and discharging when the temperature reaches 140 +/-5 ℃;
step five: putting the premixed rubber compound obtained in the step four into an open mill, controlling the temperature to be 100 +/-5 ℃, turning the material for 180 seconds at the thickness of 5mm, and cutting the material into corresponding weight by fluttering the material with the thickness of 2mm to be respectively kept stand;
step six: putting the rubber material obtained in the fifth step into an open mill again for calendering and passing, controlling the temperature to be 70 +/-5 ℃, standing and cooling to obtain pre-mixed rubber B;
step seven: mixing the premixed rubber B, the ethylene propylene diene monomer 7001, stearic acid, zinc stearate, zinc oxide, a flame retardant, N550 carbon black, magnesium hydroxide and polyethylene glycol, putting the mixture into an internal mixer, pressurizing and kneading, and pouring when the temperature reaches 135 +/-5 ℃;
and step eight, putting the sizing material obtained in the step seven into an open mill table, controlling the temperature to be 90 +/-5 ℃, turning the material for 180 seconds at the thickness of 5mm, and then, drifting and cutting the material into corresponding weight for standing treatment respectively, wherein the thickness of the thin material is 2 mm.
Step nine, putting the rubber material obtained in the step eight into an open mill again for calendering and thin passing, controlling the temperature to be 65 +/-5 ℃, standing and cooling for 12 hours to obtain mixed rubber C;
step ten: adding mixed rubber C, softening agent paraffin oil, accelerator DM, foaming agent, sulfur and odorless DCP into an internal mixer, pressurizing, kneading, and pouring when the temperature reaches 130 +/-5 ℃;
step eleven: putting the mixture obtained in the step ten into an open mill, controlling the temperature to be 85 +/-5 ℃, and performing thick-pass twice, thin-pass twice and thick-pass twice to further mix the raw materials of the components;
step twelve: putting the mixture obtained in the step eleven into an open mill again for calendering and thin passing, controlling the temperature to be 60 +/-5 ℃, standing and cooling for 12 hours to obtain mixed glue D;
step thirteen: an extrusion process;
fourteen steps: and (3) a vulcanization foaming molding process.
Further, the extrusion process comprises the following specific steps:
(1) putting the mixed rubber D into an open mill, controlling the temperature to be 85 +/-5 ℃, and open milling for 600 seconds to further mix and pre-heat the raw materials of each component;
(2) extruding the mixed glue obtained in the previous step by using an extruder, and controlling the temperature to be 85 +/-5 ℃;
(3) and (4) sheet discharging weighing of an automatic cutting sheet discharging conveyor connected with the extruder, and standing and cooling.
Further, the vulcanization foaming molding process comprises the following specific steps:
(1) accurately weighing the material sheet in the last step, filling the material sheet into a corresponding vulcanizing machine die for foaming to obtain a foaming body, and trimming;
(2) filling the foaming body into a foaming machine die for foaming to obtain a high-elasticity foaming body;
(3) naturally cooling the high elastic foamed body at room temperature for 2-3 days, and collecting the product into the display board after the product is fully cooled and contracted.
Further, the method also comprises a fifteenth step, wherein the fifteenth step comprises the following specific steps:
and (4) putting the foaming body obtained in the last step into a corresponding oven for baking, cooling and warehousing.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. the high styrene resin with high mechanical rigidity and elasticity and the ethylene propylene diene monomer rubber have excellent weather resistance, ozone resistance, heat resistance, electric insulation and chemical medium corrosion resistance, are compatible and blended to form the multi-blending closed-cell foam material with good comprehensive performance and moderate cost.
2. The high styrene resin products on the market are produced by adopting a vulcanization process at present, and the invention increases a foaming process, reduces the weight of materials, lightens the weight, and has uniform pore diameter and material dispersibility.
3. The high flame resistance requirement of the application target of the state of the thinner foaming product provides a very large test, and the normal vertical combustion test UL94V0 standard meets the regulatory requirement in the thickness range of 0-13mm of material sampling, but the invention has the difficulty of realizing the combustion grade of the vertical combustion UL94V0 in the thickness range of 0-1mm multiplied by the difficulty of achieving the test in the thickness range of 0-1mm according to the market demand, and the thinner material product, especially the thinner foaming material product has poorer flame resistance. The finished product prepared by the method can meet the requirement of high flame retardance of UL94v0 grade under the thickness of 1 mm.
4. In the invention, a large amount of flame retardant is used for replacing a reinforcing filler for enhancing the flame retardant effect, but the reinforcing filler loses the reinforcing effect, generates an isolation effect, has poorer mutual viscosity, prevents rubber molecules from agglomerating, is not beneficial to banburying open mixing and extrusion processes, also easily causes carbon deposit aggregation on the aperture structure difference agglomeration of products and the surfaces of the products due to the supplement of a large amount of carbon black, particularly, the difficulties of poor mutual viscosity of three types of rubber, poor mutual viscosity of the rubber and the flame retardant and poor compatibility of the rubber and the large amount of carbon black are comprehensively overcome by the banburying open mixing and the repeated calendering and standing processes and the extrusion processes under the specific temperature conditions of two rubber materials through the banburying open mixing, the invention increases the foaming process, provides great tests on the requirements of light weight of materials, aperture uniformity, material dispersibility and high flame retardance of thinner application targets, adds a pyrolysis stabilizer N-phenyl maleimide (NPMI) into the premixed rubber, the nano-particles have the characteristics of small-size effect, high specific surface effect, macroscopic quantum effect and the like of the nano-particles, can permeate into a polymer chain, and enhances the stability of molecules; the organic material has large atomic radius, strong complexing ability and special complexing effect, can increase the crosslinking density and the stability among molecular chains of the organic material, greatly improves the heat resistance, oil resistance, strength, tear resistance, wear resistance and the like of the material, has the functions of promoting vulcanization, absorbing and shielding ultraviolet radiation, and enables the product to be more resistant to aging.
5. Meanwhile, the heat-resistant agent nano cerium oxide is added during the pre-mixing of the EVM and the high styrene resin, and the following effects can be achieved: (1) the nanometer cerium oxide has good crystal form and high specific gravity, and the product has good dispersibility and transparency and is easy to be added into polymers such as plastic, rubber and the like; (2) the nano-cerium oxide has the characteristic of large specific surface area, is suitable for catalytic modification and thermal stability of materials, and ensures the flame retardant effect; (3) the nanometer cerium oxide has the characteristic of small crystal grain size, and is suitable for the sun-proof ultraviolet isolation and aging resistance of products. The growth of crystal lattices is inhibited, the preferred orientation of crystal faces is promoted, the cell structure is more uniform, and the compactness of the cell structure of the product is improved. The problem that EPDM-containing rubber of products on the market is odorous when ethylene propylene diene monomer is added is solved, the comprehensive performance index after blending greatly exceeds the performance when the EPDM-containing rubber is used alone, the excellent vibration absorption performance brought by the mechanical rigidity and elasticity of the high styrene resin is kept, and meanwhile, the product not only passes the ROHS international environmental protection requirement but also has the excellent novel high-flame-retardant characteristic.
Detailed Description
In order to better understand the technical solutions, the technical solutions will be described in detail with reference to the description and the specific embodiments.
Example 1:
a preparation method of an environment-friendly high-flame-retardant EVM, high styrene resin and EPDM ternary blending secondary foaming material comprises the following specific steps:
banburying and premixing process:
step one, premixing a 75L rhombic blade shaft W-shaped heavy hammer internal mixer: putting 100 parts of EVM, 80 parts of high styrene resin, 10 parts of heat-resistant agent nano cerium oxide JC-Ce0A, 15 parts of pyrolysis stabilizer N-phenyl maleimide (NPMI) and 5 parts of stearic acid into an internal mixer according to the weight part ratio, pressurizing to 7 kg, kneading for 10 minutes, continuously filling cold water in the kneading process to cool, and discharging when the temperature reaches 150 ℃;
step two, opening the 18 inches automatic material turning open mill: and (3) putting the rubber material obtained in the step one into an open mill, controlling the temperature at 115 ℃, turning the material for 180 seconds at the thickness of 5mm, and cutting the material into corresponding weight by fluttering the material with the thickness of 2mm to be respectively kept stand.
Step three, 16 inches open mill calendering and standing: putting the materials which are milled by the 18 inches automatic material turning open mill in the step two into a 16 inches open mill again for calendering and thin-passing, controlling the temperature at 80 ℃, standing and cooling for 12 hours to obtain pre-mixed glue A;
premixing by using a diamond blade shaft W-shaped heavy hammer internal mixer of 75L: putting 100 parts of premixed rubber A, 100 parts of EPDM-7001 and 5 parts of stearic acid into an internal mixer according to the weight part ratio, pressurizing to 7 kg, kneading for 10 minutes, continuously filling cold water for cooling in the kneading process, and discharging when the temperature reaches 145 ℃;
fifthly, opening the 18 inches automatic material turning open mill: and (4) putting the premixed rubber compound obtained in the step four into an open mill, controlling the temperature at 95 ℃, turning for 180 seconds at the thickness of 5mm, and cutting into corresponding weights by means of floating at the thickness of 2mm to be respectively subjected to standing treatment.
Step six, 16 inches open mill calendering and standing: putting the materials which are milled by the 18 inches automatic material turning open mill in the step five into a 16 inches open mill again for calendering and thin-passing, controlling the temperature at 75 ℃, standing and cooling for 12 hours to obtain pre-mixed rubber B;
mixing by using a seven 75L diamond blade shaft W-shaped heavy hammer internal mixer: mixing 100 parts of premix rubber B, 50 parts of ethylene propylene diene monomer 7001, 5 parts of stearic acid, 6 parts of zinc stearate, 25 parts of zinc oxide, 170 parts of flame retardant, 105 parts of N550 carbon black, 50 parts of magnesium hydroxide and 1 part of polyethylene glycol according to the weight part ratio, putting the mixture into an internal mixer, pressurizing to 7 kilograms, kneading for 12 minutes, and pouring when the temperature reaches 135 ℃;
eight 18 inches of automatic material turning open mill: and C, putting the sizing material obtained in the step seven into an open mill, controlling the temperature at 85 ℃, turning the sizing material for 180 seconds at the thickness of 5mm, and cutting the sizing material into corresponding weight by drifting at the thickness of 2mm, and standing the sizing material respectively.
Rolling and standing by a nine 16-inch open mill: putting the materials which are milled by the 18 inches automatic material turning open mill in the step eight into a 16 inches open mill again for calendering and thin-passing, controlling the temperature at 70 ℃, standing and cooling for 12 hours to obtain mixed glue C;
mixing by a W-shaped heavy hammer internal mixer with a rhombic blade shaft of ten 75L: putting 100 parts of mixed rubber C, 26 parts of softening agent paraffin oil, 3 parts of accelerating agent DM, 10 parts of foaming agent, 4 parts of sulfur and 2 parts of odorless DCP into an internal mixer according to the weight part ratio, pressurizing to 7 kilograms, kneading for 12 minutes, and pouring when the temperature reaches 125 ℃;
eleven 18 inches of automatic material turning open mill: putting the mixture obtained in the step ten into an open mill, controlling the temperature at 90 ℃, and performing thick-passing twice, thin-passing twice and thick-passing twice to further mix the raw materials of the components;
rolling and standing by a twelve 16-inch open mill: putting the mixture obtained after the 18 inches automatic material turning open mill in the step eleven into a 16 inches open mill again for calendering and thin passing, controlling the temperature at 65 ℃, standing and cooling for 12 hours to obtain mixed glue D;
an extrusion process:
thirteen 18 inches of automatic material turnover open mill: putting the mixed rubber D in the step twelve into an open mill, controlling the temperature at 90 ℃, and carrying out open milling for 600 seconds to further mix and pre-heat the raw materials of each component;
step fourteen 250 diameter length-diameter ratio 1: 8, extruding by a hot feeding single screw extruder at the speed of 2-3 meters per minute, and controlling the temperature to be 90 ℃;
and step fifteen, the sheet discharging of an automatic cutting sheet discharging conveyor connected with the extruder is weighed, and the extruder is kept stand and cooled.
And (3) vulcanization foaming molding stage:
sixteen steps of in-mold closed-hole vulcanization: accurately weighing the material sheet after the material sheet is regulated and controlled in the step fifteen, and filling the material sheet into a corresponding vulcanizing machine die for foaming, wherein the die is 600mm x 1200mm x 18 mm; vulcanization conditions (oil pressure/steam pressure or temperature time) 130kg/cm oil pressure; releasing the pressure to obtain a foaming body, heating the foaming body with the size of 850 × 1550 × 25mm, and trimming;
seventeen-mold closed-cell foaming, namely filling the foaming body obtained in the step sixteen into a corresponding 500-ton foaming machine mold for foaming, wherein the mold is 110cm x 210cm x 35mm, foaming is 165 ℃ x 3500 seconds, and pressure is relieved to obtain a high-elasticity foaming body with the size of 1200x 2300x 42 mm;
eighteen, naturally cooling the foaming body subjected to the seventeen steps for 2-3 days at room temperature, and collecting the foaming body into a display board after the product is fully cooled and contracted;
and (3) free baking to remove VOC harmful gas residues:
step nineteen, putting the foaming body obtained in the step eighteen into a corresponding oven for baking, wherein the baking temperature is 120 ℃ for 4 hours;
twenty shaping: naturally cooling the foaming body at room temperature for 2-3 days, cooling to 1080x 2080x 36mm after the product is fully cooled and contracted, warehousing and standing for 7-10 days for processing and use.
Example 2:
a preparation method of an environment-friendly high-flame-retardant EVM, high styrene resin and EPDM ternary blending secondary foaming material comprises the following specific steps:
banburying and premixing process:
step one, premixing a 75L rhombic blade shaft W-shaped heavy hammer internal mixer: putting 100 parts of EVM, 80 parts of high styrene resin, 15 parts of heat-resistant agent nano cerium oxide JC-Ce0A, 10 parts of pyrolysis stabilizer N-phenyl maleimide (NPMI) and 3 parts of stearic acid into an internal mixer according to the weight part ratio, pressurizing to 7 kg, kneading for 10 minutes, continuously filling cold water in the kneading process to cool, and discharging when the temperature reaches 155 ℃;
step two, opening the 18 inches automatic material turning open mill: and (3) putting the rubber material obtained in the step one into an open mill, controlling the temperature at 110 ℃, turning the material for 180 seconds at the thickness of 5mm, and cutting the material into corresponding weight by fluttering the material with the thickness of 2mm to be respectively kept stand.
Step three, 16 inches open mill calendering and standing: putting the materials which are milled by the 18 inches automatic material turning open mill in the step two into a 16 inches open mill again for calendering and thin-passing, controlling the temperature at 90 ℃, standing and cooling for 12 hours to obtain pre-mixed glue A;
premixing by using a diamond blade shaft W-shaped heavy hammer internal mixer of 75L: putting 100 parts of premixed rubber A, 100 parts of EPDM-7001 and 3 parts of stearic acid into an internal mixer according to the weight part ratio, pressurizing to 7 kg, kneading for 10 minutes, continuously filling cold water for cooling in the kneading process, and discharging when the temperature reaches 135 ℃;
fifthly, opening the 18 inches automatic material turning open mill: putting the premixed rubber compound obtained in the step four into an open mill, controlling the temperature at 105 ℃, turning for 180 seconds at 5mm, and cutting into corresponding weight by drifting with the thickness of 2mm to be respectively subjected to standing treatment;
step six, 16 inches open mill calendering and standing: putting the materials which are milled by the 18 inches automatic material turning open mill in the step five into a 16 inches open mill again for calendering and thin-passing, controlling the temperature at 65 ℃, standing and cooling for 12 hours to obtain pre-mixed rubber B;
mixing by using a seven 75L diamond blade shaft W-shaped heavy hammer internal mixer: mixing 100 parts of premix rubber B, 50 parts of ethylene propylene diene monomer 7001, 3 parts of stearic acid, 9 parts of zinc stearate, 21 parts of zinc oxide, 150 parts of flame retardant, 125 parts of N550 carbon black, 80 parts of magnesium hydroxide and 2 parts of polyethylene glycol according to the weight part ratio, putting the mixture into an internal mixer, pressurizing to 7 kilograms, kneading for 12 minutes, and pouring when the temperature reaches 140 ℃;
eight 18 inches of automatic material turning open mill: putting the sizing material obtained in the step seven into an open mill, controlling the temperature at 95 ℃, turning the sizing material for 180 seconds at the thickness of 5mm, and then, drifting and cutting the sizing material into corresponding weight for standing treatment respectively, wherein the thickness of the thin material is 2 mm;
rolling and standing by a nine 16-inch open mill: putting the materials which are milled by the 18 inches automatic material turning open mill in the step eight into a 16 inches open mill again for calendering and thin-passing, controlling the temperature at 60 ℃, standing and cooling for 12 hours to obtain mixed glue C;
mixing by a W-shaped heavy hammer internal mixer with a rhombic blade shaft of ten 75L: putting 100 parts of mixed rubber C, 31 parts of softening agent paraffin oil, 2 parts of accelerating agent DM, 8 parts of foaming agent, 6 parts of sulfur and 1 part of odorless DCP into an internal mixer according to the weight part ratio, pressurizing to 7 kilograms, kneading for 12 minutes, and pouring when the temperature reaches 135 ℃;
eleven 18 inches of automatic material turning open mill: putting the mixture obtained in the step ten into an open mill, controlling the temperature at 80 ℃, and performing thick-passing twice, thin-passing twice and thick-passing twice to further mix the raw materials of the components;
rolling and standing by a twelve 16-inch open mill: putting the mixture obtained after the 18 inches automatic material turning open mill in the step eleven into a 16 inches open mill again for calendering and thin passing, controlling the temperature at 55 ℃, standing and cooling for 12 hours to obtain mixed glue D;
an extrusion process:
thirteen 18 inches of automatic material turnover open mill: putting the mixed rubber D obtained in the step ten into an open mill, controlling the temperature at 80 ℃, and carrying out open milling for 600 seconds to further mix and pre-heat the raw materials of each component;
step fourteen 250 diameter length-diameter ratio 1: extruding by an 8-hot-feeding single-screw extruder at the speed of 2-3 meters per minute, and controlling the temperature to 80 ℃;
and step fifteen, the sheet discharging of an automatic cutting sheet discharging conveyor connected with the extruder is weighed, and the extruder is kept stand and cooled.
And (3) vulcanization foaming molding stage:
sixteen steps of in-mold closed-hole vulcanization: the material sheet after the regulation and control of the step fifteen is precisely weighed again, and is filled into a corresponding vulcanizing machine die for foaming, wherein the die is 600mm x 1200mm x 18 mm; vulcanization conditions (oil pressure/steam pressure or temperature time) 130kg/cm oil pressure; releasing pressure at 145 deg.c for 2800 sec to obtain high elasticity foamed body, heating at 850 deg.c and 1550 deg.c for 25mm and trimming;
seventeen steps of closed-cell foaming in the mold: placing the foaming body obtained in the step sixteen into a corresponding foaming machine mould of 500 tons for foaming, wherein the mould is 110cm x 210cm x 35mm, foaming is 165 ℃ x 3500 seconds, and pressure is relieved to obtain the high-elasticity foaming body with the size of 1200x 2300x 42 mm;
eighteen, naturally cooling the foaming body subjected to the seventeen steps for 2-3 days at room temperature, and collecting the foaming body into a display board after the product is fully cooled and contracted;
and (3) free baking to remove VOC harmful gas residues:
step nineteen, putting the foaming body obtained in the step eighteen into a corresponding oven for baking, wherein the baking temperature is 120 ℃ for 4 hours;
twenty shaping: naturally cooling the foaming body at room temperature for 2-3 days, cooling to 1080x 2080x 36mm after the product is fully cooled and contracted, warehousing and standing for 7-10 days for processing and use.
The specifications of the raw materials used in examples 1 and 2 are shown in table 1 below:
the physical property test results of the environment-friendly high flame retardant EVM and high styrene resin and EPDM ternary blended secondary foaming material obtained in example 1 and example 2 are shown in the following table 2:
the above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.
Claims (5)
1. An environment-friendly high flame retardant EVM, high styrene resin and EPDM ternary blending secondary foaming material is characterized by comprising:
mixed rubber C100 parts
26 to 31 portions of softening agent paraffin oil
2 to 3 portions of accelerant DM
8 to 10 portions of foaming agent
4 to 6 portions of sulfur
Odorless DCP 1-2 parts
The mixed glue C comprises:
100 portions of premixed rubber B
700150 parts of ethylene propylene diene monomer
Stearic acid 3-5 parts
6-9 parts of zinc stearate
21 to 25 portions of zinc oxide
150-170 parts of flame retardant
105-125 parts of carbon black
50-80 parts of magnesium hydroxide
Polyethylene glycol 1-2 parts
The pre-mixed glue B comprises: 100 parts of premixed rubber A, 7001100 parts of ethylene propylene diene monomer rubber and 3-5 parts of stearic acid;
the pre-mixed glue A comprises: 10 parts of EVM, 80 parts of high styrene resin, 3-5 parts of stearic acid, 10-15 parts of heat-resistant agent nano cerium oxide JC-Ce0A 10 and 10-15 parts of pyrolysis stabilizer N-phenyl maleimide (NPMI).
2. A preparation method of an environment-friendly high-flame-retardant EVM, high styrene resin and EPDM ternary blended secondary foaming material is characterized by comprising the following steps:
the method comprises the following steps: putting EVM, high styrene resin, heat-resistant agent nanometer cerium oxide JC-Ce0A, pyrolysis stabilizer N-phenyl maleimide (NPMI) and 3-5 parts of stearic acid into an internal mixer, pressurizing and kneading, continuously filling cold water for cooling in the kneading process, and discharging when the temperature reaches 150 +/-5 ℃;
step two: putting the rubber material obtained in the step one into an open mill, controlling the temperature at 110 +/-5 ℃, turning the material for 180 seconds at the thickness of 5mm, and cutting the material into corresponding weight by fluttering the material with the thickness of 2mm to be respectively kept stand;
step three: putting the rubber material obtained in the step two into an open mill for calendering and thin passing, controlling the temperature to be 85 +/-5 ℃, standing and cooling to obtain pre-mixed rubber A;
step four: putting the premixed rubber A, EPDM-7001, stearic acid and zinc stearate into an internal mixer, pressurizing and kneading, continuously filling cold water for cooling in the kneading process, and discharging when the temperature reaches 140 +/-5 ℃;
step five: putting the premixed rubber compound obtained in the step four into an open mill, controlling the temperature to be 100 +/-5 ℃, turning the material for 180 seconds at the thickness of 5mm, and cutting the material into corresponding weight by fluttering the material with the thickness of 2mm to be respectively kept stand;
step six: putting the rubber material obtained in the fifth step into an open mill again for calendering and passing, controlling the temperature to be 70 +/-5 ℃, standing and cooling to obtain pre-mixed rubber B;
step seven: mixing the premixed rubber B, the ethylene propylene diene monomer 7001, stearic acid, zinc stearate, zinc oxide, a flame retardant, N550 carbon black, magnesium hydroxide and polyethylene glycol, putting the mixture into an internal mixer, pressurizing and kneading, and pouring when the temperature reaches 135 +/-5 ℃;
step eight, putting the sizing material in the step seven into an open mill table, controlling the temperature to be 90 +/-5 ℃, turning the material for 180 seconds at the thickness of 5mm, and flapping and cutting the material into corresponding weight for standing treatment respectively, wherein the thickness of the thin tube is 2 mm;
step nine, putting the rubber material obtained in the step eight into an open mill again for calendering and thin passing, controlling the temperature to be 65 +/-5 ℃, standing and cooling for 12 hours to obtain mixed rubber C;
step ten: adding mixed rubber C, softening agent paraffin oil, accelerator DM, foaming agent, sulfur and odorless DCP into an internal mixer, pressurizing, kneading, and pouring when the temperature reaches 130 +/-5 ℃;
step eleven: putting the mixture obtained in the step ten into an open mill, controlling the temperature to be 85 +/-5 ℃, and performing thick-pass twice, thin-pass twice and thick-pass twice to further mix the raw materials of the components;
step twelve: putting the mixture obtained in the step eleven into an open mill again for calendering and thin passing, controlling the temperature to be 60 +/-5 ℃, standing and cooling for 12 hours to obtain mixed glue D;
step thirteen: an extrusion process;
fourteen steps: and (3) a vulcanization foaming molding process.
3. The preparation method of the environment-friendly high flame retardant EVM, high styrene resin and EPDM ternary blended secondary foam material according to claim 1, characterized in that the extrusion process comprises the following specific steps:
putting the mixed rubber D into an open mill, controlling the temperature to be 85 +/-5 ℃, and open milling for 600 seconds to further mix and pre-heat the raw materials of each component;
extruding the mixed glue obtained in the previous step by using an extruder, and controlling the temperature to be 85 +/-5 ℃;
and (4) sheet discharging weighing of an automatic cutting sheet discharging conveyor connected with the extruder, and standing and cooling.
4. The preparation method of the environment-friendly high flame retardant EVM, high styrene resin and EPDM ternary blended secondary foam material according to claim 1, characterized in that the vulcanization foaming molding process comprises the following specific steps:
(1) accurately weighing the material sheet in the last step, filling the material sheet into a corresponding vulcanizing machine die for foaming to obtain a foaming body, and trimming;
(2) filling the foaming body into a foaming machine die for foaming to obtain a high-elasticity foaming body;
(3) naturally cooling the high elastic foamed body at room temperature for 2-3 days, and collecting the product into the display board after the product is fully cooled and contracted.
5. The preparation method of the environment-friendly high flame retardant EVM, high styrene resin and EPDM ternary blended secondary foam material according to claim 1, further comprising a fifteenth step, wherein the fifteenth step comprises the following specific steps:
and (4) putting the foaming body obtained in the last step into a corresponding oven for baking, cooling and warehousing.
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