CN112608537A - Environment-friendly high-flame-retardance CR multi-element blending closed-cell secondary foam material and preparation method thereof - Google Patents
Environment-friendly high-flame-retardance CR multi-element blending closed-cell secondary foam material and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/002—Methods
- B29B7/005—Methods for mixing in batches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3442—Mixing, kneading or conveying the foamable material
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2205/00—Foams characterised by their properties
- C08J2205/04—Foams characterised by their properties characterised by the foam pores
- C08J2205/052—Closed cells, i.e. more than 50% of the pores are closed
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- C08J2311/00—Characterised by the use of homopolymers or copolymers of chloroprene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
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- 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
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
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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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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- 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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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/02—Elements
- C08K3/04—Carbon
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
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- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
Abstract
The invention discloses an environment-friendly high-flame-retardance CR multi-component blending closed-cell secondary foam material and a preparation method thereof, wherein the environment-friendly high-flame-retardance CR multi-component blending closed-cell secondary foam material comprises 100 parts of mixed rubber C, 8 parts of foaming agent and 5 parts of odorless DCP; the mixed glue C comprises: 100 parts of premixed rubber A, 100 parts of premixed rubber B, 5 parts of stearic acid, 10 parts of zinc stearate, 20 parts of zinc oxide, 200 parts of flame retardant, 80 parts of carbon black and 150 parts of aluminum hydroxide; the pre-mixed glue A comprises: 100 parts of POE, 50 parts of CR40W 50 and 2 parts of stearic acid; the pre-mixed glue B comprises: 100 parts of CR40W 100, 50 parts of EVM and 2 parts of stearic acid. The environment-friendly high-flame-retardant CR multi-element blending closed-cell secondary foaming material is subjected to vertical combustion test, and the test result shows that when the sample is 0.8mm, the sample accords with the V-O grade.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to an environment-friendly high-flame-retardant CR multi-component blending closed-cell secondary foaming material and a preparation method thereof.
Background
CR foam materials generally have excellent sealing properties, avoiding gas out-release and fogging; the anti-vibration device has the advantages of excellent compression deformation resistance, namely, the elasticity has durability, and long-term anti-vibration protection of accessories can be ensured. The adhesive tape can be customized according to the requirements of customers, various imported adhesive tapes can be attached, the adhesiveness is good, and the product is applied to the fields of communication, computers, household appliances, calculators, electronic toys, various electronic controllers and the like.
There is also a need in particular for excellent flame retardant properties. The physical property of the existing CR foaming material generally needs to be under the condition of thicker CR foaming material to achieve the flame retardant effect, and the existing CR foaming material does not appear in the market at present when the thickness of the CR foaming material reaches the high flame retardant requirement of UL94v0 grade. Therefore, if a CR foam 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 requirements, there is a need to solve the problem at present.
Disclosure of Invention
The embodiment of the application provides the environment-friendly high-flame-retardant CR multi-element blending closed-cell secondary foam material and the preparation method thereof, solves the technical problem that the CR foam material in the prior art cannot achieve flame retardance at the thickness of 1mm, and realizes the preparation of the CR foam material which can meet the requirement of UL94v0 grade at the thickness of 1 mm.
The embodiment of the application provides an environment-friendly high-flame-retardant CR multi-component blending closed-cell secondary foaming material, which comprises
Mixed rubber C100 parts
Foaming agent 8 parts
5 parts of odorless DCP;
the mixed glue C comprises:
100 portions of premixed rubber A
100 portions of premixed rubber B
Stearic acid 5 parts
Zinc stearate 10 parts
20 portions of zinc oxide
200 portions of flame retardant
80 portions of carbon black
150 parts of aluminum hydroxide;
the pre-mixed glue A comprises: 100 parts of POE, 50 parts of CR40W 50 and 2 parts of stearic acid;
the pre-mixed glue B comprises: 100 parts of CR40W 100, 50 parts of EVM and 2 parts of stearic acid.
A preparation method of an environment-friendly high-flame-retardant CR multi-element blending closed-cell secondary foaming material comprises the following steps:
the method comprises the following steps: putting POE, chloroprene rubber CR40W and stearic acid into an internal mixer, pressurizing, kneading, continuously filling cold water for cooling in the kneading process, and discharging when the temperature reaches 170 +/-5 ℃;
step two: putting the pre-mixed POE and CR40W into an open mill, controlling the temperature at 150 +/-5 ℃, turning for 180 seconds at the thickness of 5mm, and flapping and cutting the thin pipe with the thickness of 2mm into corresponding weights to be respectively stood for treatment;
step three: putting the mixture obtained in the step two into a 16-inch open mill again for calendering and thin passing, controlling the temperature to be 80 +/-5 ℃, standing and cooling for 12 hours to obtain premixed rubber A;
step four: adding chloroprene rubber CR40W, rubbery EVM and stearic acid into an internal mixer, pressurizing, kneading, continuously filling cold water for cooling in the kneading process, and discharging when the temperature reaches 150 +/-5 ℃;
step five: putting the mixture obtained in the step four into a refining machine, controlling the temperature to be 130 +/-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 material is 2 mm;
step six: putting the mixture obtained in the fifth step into an open mill for calendering and thin passing, controlling the temperature to be 75 +/-5 ℃, standing and cooling for 12 hours to obtain pre-mixed rubber B;
step seven: mixing the premixed rubber A, the premixed rubber B, stearic acid, zinc stearate, zinc oxide, a flame retardant, carbon black and aluminum hydroxide to form a mixture, putting the mixture into an internal mixer, pressurizing, kneading, and pouring when the temperature reaches 150 +/-5 ℃;
step eight: putting the sizing material obtained in the step seven into an open mill table, controlling the temperature to be 120 +/-5 ℃, turning the sizing material for 180 seconds after the sizing material is 5mm, and then, drifting and cutting the sizing material into corresponding weight for standing treatment respectively after the sizing material is 2mm in thickness;
step nine: putting the mixture obtained in the step eight into a 16-inch open mill for calendering and thin passing, controlling the temperature to be 70 +/-5 ℃, standing and cooling for 12 hours to obtain mixed glue C;
step ten: putting the mixed rubber C, the foaming agent and the 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 100 +/-5 ℃, and carrying out thick passing twice, thin passing twice and thick passing 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: a vulcanization foaming molding process;
further, the extrusion process comprises the following steps:
(1) putting the mixed rubber D in the step twelve into an open mill, controlling the temperature to be 110 +/-5 ℃, and opening for 600 seconds to further mix and pre-heat the raw materials of each component;
(2) 250 diameter aspect 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 95 +/-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 steps:
(1) accurately weighing the material sheet obtained in the step thirteen, and filling the material sheet into a corresponding vulcanizing machine die for foaming to obtain a foaming body;
(2) filling the high-elasticity foaming body into a foaming machine die for foaming to obtain the high-elasticity foaming body;
(3) naturally cooling the foaming body for 2-3 days at room temperature, 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 prior CR products are mostly produced by adopting a vulcanization process so as to ensure the flame retardant property of the products. According to the preparation method, chloroprene rubber CR40W and EVM/POE are subjected to compatible blending to form the multi-blending closed-cell foaming material with good comprehensive performance and moderate cost, the foaming process is increased, the weight of the material is reduced, the weight is light, the aperture of a finished product is uniform, and the dispersibility of the material is good.
2. In the normal vertical burning test UL94V0 standard, the thickness interval of 0-13mm of material sampling meets the requirement of regulations, the thinner material product, especially the thinner foaming material product has poorer flame retardance, so the difficulty of realizing the burning grade of the vertical burning UL94V0 in the thickness interval of 0-1mm is multiplied, but the finished product of the invention achieves the test in the thickness interval of 0-1mm, and the test result meets the V-O burning grade.
3. 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, hinders the conglomeration of rubber molecules, is not beneficial to the banburying open mill and the extrusion process, is easy to cause the carbon deposit aggregation on the aperture structure difference conglomeration and the product surface of a product due to the supplement of a large amount of carbon black, particularly increases the difficulties of the premixing and stage cross mixing and repeated calendering and standing processes of two sizing materials under specific temperature conditions through the banburying open mill, and the extrusion process comprehensively overcomes the defects of poor mutual viscosity of three types of rubber, poor mutual viscosity of the rubber and the flame retardant, poor compatibility of the rubber and the large amount of carbon black, and the restriction of the filling of the large amount of the flame retardant and the carbon black on the fluidity of the sizing materials, adds POE/EVM when chloroprene rubber is added, reduces the hardness, improves the, the rubber keeps high mechanical strength and elongation, the rubber has odor, the comprehensive performance index after blending greatly exceeds the performance when the rubber is used alone, and simultaneously, the rubber not only passes the ROHS international environmental protection requirement, but also has excellent novel high-flame-retardant property.
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 CR multi-element blending closed-cell secondary foaming material comprises the following steps:
banburying and premixing process:
step one, premixing a 75L rhombic blade shaft W-shaped heavy hammer internal mixer: putting 100 parts of POE, 50 parts of chloroprene rubber CR40W and 1.5 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 175 ℃;
step two, opening the 18 inches automatic material turning open mill: putting the pre-mixed POE and CR40W into an open mill, controlling the temperature at 155 ℃, turning over materials for 180 seconds at 5mm, and cutting the thin strips into corresponding weight by swinging at the thickness of 2mm for standing treatment respectively;
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 85 ℃, 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: according to the weight portion, 100 portions of chloroprene rubber CR40W, 50 portions of rubbery EVM and 1.5 portions of stearic acid are put into an internal mixer, pressurized to 7 kilograms, kneaded for 10 minutes, continuously filled with cold water to reduce the temperature in the kneading process, and discharged when the temperature reaches 155 ℃;
fifthly, opening the 18 inches automatic material turning open mill: and C, putting the premixed chloroprene rubber CR40W and the EVM into an open mill, controlling the temperature at 135 ℃, turning for 180 seconds at 5mm, and flapping and cutting into the materials with the thickness of 2mm to obtain corresponding weights for standing treatment respectively.
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 premixed rubber A, 100 parts of premixed rubber B, 4 parts of stearic acid, 7 parts of zinc stearate, 18 parts of zinc oxide, 190 parts of flame retardant, 65 parts of N774 carbon black and 130 parts of German aluminum hydroxide 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 155 ℃;
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 125 ℃, 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;
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 75 ℃, 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, 7 parts of foaming agent and 4 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 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 105 ℃, 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 obtained in the step ten into an open mill, controlling the temperature at 115 ℃, 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 100 ℃;
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 obtained after the regulation and control of the step thirteen, 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 pressure at 150 deg.c for 2600 sec to obtain high elastic foamed body, heating and trimming to size 880 × 1600 × 23 mm;
seventeen steps of closed-cell foaming in the mold: filling the foaming body in the fourteenth step into a corresponding foaming machine mould of 500 tons for foaming, wherein the mould is 110cm by 210cm by 35mm; foaming at 170 ℃ for 3000 seconds to release pressure to obtain a high-elasticity foam body with the size of 1150x 2200x 40 mm;
eighteen shaping steps: naturally cooling the foaming body after the fifteen steps for 2-3 days at room temperature, and collecting the product into the 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 after the step sixteen into a corresponding oven for baking, wherein the baking temperature is 100 ℃ for 4 hours;
and step twenty, naturally cooling the foaming body at room temperature for 2-3 days, cooling the product after fully cooling and shrinking to 1050x2050x35mm, putting the product into a warehouse, standing for 7-10 days, and processing for use.
Example two
A preparation method of an environment-friendly high-flame-retardant CR multi-element blending closed-cell secondary foaming material comprises the following steps:
banburying and premixing process:
step one, premixing a 75L rhombic blade shaft W-shaped heavy hammer internal mixer: putting 100 parts of POE, 50 parts of chloroprene rubber CR40W and 2 parts of stearic acid into an internal mixer according to the weight parts, pressurizing to 7 kg, kneading for 10 minutes, continuously filling cold water for cooling in the kneading process, and discharging when the temperature reaches 170 ℃;
step two, opening the 18 inches automatic material turning open mill: and (3) putting the pre-mixed POE and CR40W into an open mill, controlling the temperature at 150 ℃, turning over materials for 180 seconds at the thickness of 5mm, and flapping and cutting the thin strips into corresponding weights at the thickness of 2mm to be respectively stood and treated.
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: according to the weight portion, 100 portions of chloroprene rubber CR40W, 50 portions of rubbery EVM and 2 portions of stearic acid are put into an internal mixer, pressurized to 7 kilograms, kneaded for 10 minutes, continuously filled with cold water to reduce the temperature in the kneading process, and discharged when the temperature reaches 150 ℃;
fifthly, opening the 18 inches automatic material turning open mill: and C, putting the premixed chloroprene rubber CR40W and the EVM into an open mill, controlling the temperature at 130 ℃, turning for 180 seconds at 5mm, and flapping and cutting into the materials with the thickness of 2mm to obtain corresponding weights for standing treatment respectively.
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 80 ℃, 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 premixed rubber A, 100 parts of premixed rubber B, 5 parts of stearic acid, 10 parts of zinc stearate, 20 parts of zinc oxide, 200 parts of flame retardant, 80 parts of N774 carbon black and 150 parts of German aluminum hydroxide 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 150 ℃;
eight 18 inches of automatic material turning open mill: and (4) putting the sizing material obtained in the step seven into an open mill, controlling the temperature at 120 ℃, 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, 8 parts of foaming agent and 5 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 130 ℃;
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 100 ℃, 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 60 ℃, 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 110 ℃, 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 95 ℃;
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:
sixteen steps of in-mold closed-hole vulcanization: accurately weighing the material sheet obtained after the regulation and control of the step thirteen, 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 pressure at 150 deg.c for 2600 sec to obtain high elastic foamed body, heating and trimming to size 880 × 1600 × 23 mm;
seventeen steps of closed-cell foaming in the mold: filling the foaming body obtained in the step fourteen into a corresponding foaming machine mould of 500 tons for foaming, wherein the mould is 110cm x 210cm x35mm, and the foaming temperature is 170 ℃ x 3000 seconds for pressure relief to obtain the high-elasticity foaming body with the size of 1150x 2200x 40 mm;
eighteen shaping steps: naturally cooling the foaming body after the fifteen steps for 2-3 days at room temperature, and collecting the product into the display board after the product is fully cooled and contracted.
And (3) freely baking to remove VOC harmful gas residues:
step nineteen, putting the foaming body after the step sixteen into a corresponding oven for baking, wherein the baking temperature is 100 ℃ for 4 hours;
and twenty, naturally cooling the foaming body at room temperature for 2-3 days, cooling the product to 1050x2050x35mm after the product is fully cooled and contracted, warehousing and standing for 7-10 days, and then processing for 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 CR multi-component blended closed-cell secondary foaming material obtained in the example 1 and the example 2 are shown in the following table 2:
the environmental-friendly high-flame-retardance CR multi-element blended closed-cell secondary foam material prepared in the example 1 is taken to Shenzhen rainbow detection technology Limited for vertical combustion test, and the test result shows that when the sample is 0.8mm, the V-O grade is met, and the samples are shown in Table 3:
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 CR multi-element blended closed-cell secondary foaming material is characterized by comprising
Mixed rubber C100 parts
Foaming agent 8 parts
5 parts of odorless DCP;
the mixed glue C comprises:
100 portions of premixed rubber A
100 portions of premixed rubber B
Stearic acid 5 parts
Zinc stearate 10 parts
20 portions of zinc oxide
200 portions of flame retardant
80 portions of carbon black
150 parts of aluminum hydroxide;
the pre-mixed glue A comprises: 100 parts of POE, 50 parts of CR40W 50 and 2 parts of stearic acid;
the pre-mixed glue B comprises: 100 parts of CR40W 100, 50 parts of EVM and 2 parts of stearic acid.
2. A preparation method of an environment-friendly high-flame-retardant CR multi-element blending closed-cell secondary foaming material is characterized by comprising the following steps:
the method comprises the following steps: putting POE, chloroprene rubber CR40W and stearic acid into an internal mixer, pressurizing, kneading, continuously filling cold water for cooling in the kneading process, and discharging when the temperature reaches 170 +/-5 ℃;
step two: putting the pre-mixed POE and CR40W into an open mill, controlling the temperature at 150 +/-5 ℃, turning for 180 seconds at the thickness of 5mm, and flapping and cutting the thin pipe with the thickness of 2mm into corresponding weights to be respectively stood for treatment;
step three: putting the mixture obtained in the step two into a 16-inch open mill again for calendering and thin passing, controlling the temperature to be 80 +/-5 ℃, standing and cooling for 12 hours to obtain premixed rubber A;
step four: adding chloroprene rubber CR40W, rubbery EVM and stearic acid into an internal mixer, pressurizing, kneading, continuously filling cold water for cooling in the kneading process, and discharging when the temperature reaches 150 +/-5 ℃;
step five: putting the mixture obtained in the step four into a refining machine, controlling the temperature to be 130 +/-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 material is 2 mm;
step six: putting the mixture obtained in the fifth step into an open mill for calendering and thin passing, controlling the temperature to be 75 +/-5 ℃, standing and cooling for 12 hours to obtain pre-mixed rubber B;
step seven: mixing the premixed rubber A, the premixed rubber B, stearic acid, zinc stearate, zinc oxide, a flame retardant, carbon black and aluminum hydroxide to form a mixture, putting the mixture into an internal mixer, pressurizing, kneading, and pouring when the temperature reaches 150 +/-5 ℃;
step eight: putting the sizing material obtained in the step seven into an open mill table, controlling the temperature to be 120 +/-5 ℃, turning the sizing material for 180 seconds after the sizing material is 5mm, and then, drifting and cutting the sizing material into corresponding weight for standing treatment respectively after the sizing material is 2mm in thickness;
step nine: putting the mixture obtained in the step eight into a 16-inch open mill for calendering and thin passing, controlling the temperature to be 70 +/-5 ℃, standing and cooling for 12 hours to obtain mixed glue C;
step ten: putting the mixed rubber C, the foaming agent and the 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 100 +/-5 ℃, and carrying out thick passing twice, thin passing twice and thick passing 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 CR multi-element blended closed-cell secondary foam material as claimed in claim 2, wherein the extrusion process comprises the following steps:
(1) putting the mixed rubber D in the step twelve into an open mill, controlling the temperature to be 110 +/-5 ℃, and opening for 600 seconds to further mix and pre-heat the raw materials of each component;
(2) 250 diameter aspect 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 95 +/-5 ℃;
(3) 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 CR multi-element blended closed-cell secondary foam material as claimed in claim 2, wherein the vulcanization foaming molding process comprises the following steps:
(1) accurately weighing the material sheet obtained in the step thirteen, and filling the material sheet into a corresponding vulcanizing machine die for foaming to obtain a foaming body;
(2) filling the high-elasticity foaming body into a foaming machine die for foaming to obtain the high-elasticity foaming body;
(3) naturally cooling the foaming body for 2-3 days at room temperature, 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 CR multi-element blended closed-cell secondary foam material as claimed in claim 2, 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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