CN104072881A - Thermoplastic micro-foaming damping material and preparation method thereof - Google Patents
Thermoplastic micro-foaming damping material and preparation method thereof Download PDFInfo
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- 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
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
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- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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- 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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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- 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
- C08J9/06—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 by a chemical blowing agent
- C08J9/10—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 by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
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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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76498—Pressure
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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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
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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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76551—Time
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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
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
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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
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—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
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/14—Copolymers of propene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/14—Applications used for foams
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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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- 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
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four 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
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/04—Thermoplastic elastomer
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
Abstract
The invention belongs to the technical field of polymer material processing, and relates to a thermoplastic micro-foaming damping material and a preparation method thereof. The damping material is composed of the following components in parts by weight: 80 to 100 parts of polypropylene, 50 to 80 parts of thermoplastic elastomer, 8 to 15 parts of filling materials, 1 to 2 parts of antioxidant, 12 to 25 parts of viscosity adjusting agent, 10 to 18 parts of foaming master batch, and 0.8 to 1.5 parts of dispersant. Polypropylene is co-modified by the thermoplastic elastomer and a viscosity adjusting agent to prepare the thermoplastic micro-foaming damping material so as to achieve the goals of toughening and strengthening; and at the same time, foaming master batch is added for injection foaming, so the foaming is uniform and the product appearance is beautiful. The preparation method has the advantages of simple formula, easily available raw materials, low cost, simple operation, controllable technology conditions, low operation cost, high production efficiency, and good product performance. The thermoplastic micro-foaming damping material is widely used in industries such as package industry, construction industry, automobile industry, aerospace industry, and sports equipment industry.
Description
Technical field
The invention belongs to processing of high molecular material technical field, relate to micro-foamed damping material of a kind of thermoplasticity and preparation method thereof.
Background technology
Micro-foaming material refers to take polymer materials as matrix, wherein contains abscess-size from being less than the porous polymer material of a micron to tens microns.Porous plastics prepared by conventional physics or chemical blowing process is because its aperture is larger, conventionally do not belong to this category, compare with the millimetre-sized abscess of general porous plastics, the abscess of micro-foamable polymer is much smaller, and cell density is much bigger, thereby be called micro-foamed polymer material.Micro-foamed thermoplastic elastomers is because it has good mechanical property, excellent resistance toheat, resistant to chemical media, weathering resistance and ageing resistance has been applied to the damping field of high-speed railway, but that generally uses at present prepares in pure foamed thermoplastic elastomers not independently bubble with chemical blowing process, bubble is large and remain chemical substance, its mechanical properties etc. are unstable, can't meet the needs of high ferro damping completely.Existing rubber pad, EVA pad, TPU pad have been difficult to meet the damping requirement of growing high-speed railway, and work-ing life is also short; Though and engineering plastics have higher-strength but itself snappiness and dynamic properties cause its damping effect poor.
Summary of the invention
The object of the invention is to provides micro-foamed damping material of a kind of thermoplasticity and preparation method thereof for overcoming the defect of prior art.
For achieving the above object, the technical solution used in the present invention is as follows:
The micro-foamed damping material of thermoplasticity, by the component that comprises following weight part, made:
Described polypropylene is selected from Co-polypropylene, and its melting index is 1.5～3g/10min.
Described thermoplastic elastomer is selected from one or more in thermoplastic polyester elastomer (TPEE), thermoplasticity Ethylene Propylene Terpolymer dynamic vulcanization elastomerics (TPV) or thermoplastic styrene class elastomerics (TPS); Wherein, thermoplastic polyester elastomer (TPEE) is by terephthalic acid 1,4 butyleneglycols and poly-butanols copolymerization form, thermoplasticity Ethylene Propylene Terpolymer dynamic vulcanization elastomerics (TPV) is formed in acrylic plastering matrix by terpolymer EP rubber microparticulate, and thermoplastic styrene class elastomerics (TPS) is the multipolymer of divinyl or isoprene and styrene block type.
Described filler is selected from one or more in titanium dioxide, mica, talcum powder or silicon-dioxide.
Described oxidation inhibitor is selected from thio-2 acid octadecyl ester, [β-(3,5 di-t-butyl 4-hydroxyl-phenyl) propionic acid] pentaerythritol ester, Tyox B or 4, one or more in 4 '-sulfo-(6-tertiary butyl-3-methylphenol).
Described viscosity modifier is selected from one or more in Low Density Polyethylene, acrylonitrile-butadiene-styrene terpolymer or ethylene-vinyl acetate copolymer.
Described dispersion agent is selected from one or more in oleic acid, polyethylene wax or stearic acid.
Described foaming master batch is made by the component that comprises following weight part:
Described whipping agent is Cellmic C 121.
Described nucleator is talcum powder.
Described cladding is ethylene-vinyl acetate copolymer.
Described foaming master batch vector resin is Low Density Polyethylene.
A preparation method for the micro-foamed damping material of above-mentioned thermoplasticity, comprises the following steps:
(1) prepare foaming master batch: by 15～25 parts of whipping agents, 45～60 parts of nucleators, 30～45 parts of claddings, after 100 parts of foaming master batch vector resins add homogenizer fully to mix, utilize that twin screw extruder is extruded, granulation; Extrusion temperature is 140～150 ℃, and screw speed is 40r/min;
(2) prepare base-material: by 80～100 parts of polypropylene, 50～80 parts of thermoplastic elastomers, 8～15 parts of fillers, 1～2 part, oxidation inhibitor, 12～25 parts of viscosity modifiers, 0.8～1.5 part of dispersion agent adds stirrer high speed to be uniformly mixed 5～8min, then joins twin screw extruder and carries out granulation; Rotating speed is 180～240r/min, and Temperature Setting is 180～190 ℃, and water cooling bracing pelletizing becomes base-material;
(3) injection foaming: get in step 2 base-material of preparation, then add 10～18 parts of foaming master batchs and be mixed to join injector hopper injection foaming and obtain product.
Twin screw extruder diameter 76mm in described step (1), length-to-diameter ratio 40;
In described step (3), the concrete technology of injection foaming is: injector drying temperature is 80～90 ℃, injection pressure is 55～65MPa, be 1～2 second inject time, barrel zone temperature is respectively 185～195 ℃, 190～200 ℃, 175～185 ℃, nozzle temperature is 185～195 ℃, and die temperature is 20～30 ℃.
The prescription of micro-foamed damping material provided by the invention is simple, raw material is easy to get, with low cost, and the properties of product is good.Moulding product of the present invention is that aperture is the micro-foaming elastomer goods of closed pore of tens microns, and its smooth in appearance is smooth, has advantages of that independently bubble, foaming are less, residual without chemical substance.Simultaneously moulding product of the present invention can loss of weight 10%-40%, when being hit, the energy of absorption can increase 3-5 doubly, can make original crack tip passivation, thereby improved toughness and the antifatigue life-span of material, can meet the requirement such as mechanical property, elasticity, kinetic energy absorption of high ferro shock-absorption backing plate needs.
Beneficial effect of the present invention:
Compared with prior art, the micro-foamed damping material of thermoplasticity of the present invention adopts thermoplastic elastomer and viscosity modifier composite modified polypropylene, because viscosity modifier makes, thermoplastic elastomer and filler mobility in polypropylene is easy to control, interface is compatible good, reach the object that the while is toughness reinforcing, strengthen, ageing resistance and the anti-discolouration of material by adding oxidation inhibitor, have been improved, and add foaming master batch and carry out injection foaming, uniform in foaming, can easily control the attractive in appearance of the foaming size of abscess and product surface;
While foaming master batch of the present invention has overcome powdery whipping agent and has been easy to fly upward, affect the defects such as Measuring Precision and Working environment health, whipping agent is made to suitable size, evengranular master batch, there is high gas-forming property, the good dispersed and consistency good with resin, be easy to form the porous, expanded material structure that the closed pore gas-solid of standard combines, thermoplastic plastic's melt flow and melt diffusion have been increased, . improved melt strength, when being hit, the energy absorbing rises to five times, can make original crack tip passivation, thereby toughness and the resistance to fatigue of material have been improved.
In addition, preparation method provided by the invention is simple to operate, and processing condition are easy to control, good product performance, steady quality.
Embodiment
Below in conjunction with specific embodiment, further illustrate the present invention.In following examples, adopt GB(GB) measure the properties of material, if no special instructions, the umber of component is parts by weight.In addition, in the following example, polypropylene is selected from Co-polypropylene, and its melting index is 1.5～3g/10min.
Embodiment 1
Being prepared as follows of the micro-foamed damping material of thermoplasticity in the present embodiment:
(1) prepare foaming master batch: by 18 parts of Cellmic C 121s, 50 parts of talcum powder, 30 parts of ethylene-vinyl acetate copolymers, after 100 parts of Low Density Polyethylenes add homogenizer fully to mix, utilize that twin screw extruder is extruded, granulation; Extrusion temperature is 140～145 ℃, and screw speed is 40r/min;
(2) prepare base-material: by 100 parts of polypropylene, 50 parts, thermoplasticity Ethylene Propylene Terpolymer dynamic vulcanization elastomerics (TPV), 15 parts of titanium dioxides, 1.2 parts of thio-2 acid octadecyl esters, 12 parts of Low Density Polyethylenes, 1.3 parts of polyethylene waxs add stirrer high speed to be uniformly mixed 5min, then join twin screw extruder and carry out granulation; Rotating speed is 210r/min, and Temperature Setting is 180～185 ℃, and water cooling bracing pelletizing becomes base-material;
(3) injection foaming: get above-mentioned gained base-material, then add 15 parts of foaming master batchs and be mixed to join injector hopper injection foaming and obtain product.
Twin screw extruder diameter 76mm described above, length-to-diameter ratio 40; Injector drying temperature is 80～90 ℃, and injection pressure is 58MPa, and be 1 second inject time, and barrel zone temperature is respectively 185～190 ℃, 190～195 ℃, 175～180 ℃, and nozzle temperature is 185～190 ℃, and die temperature is 20～25 ℃.Its properties test sees attached list 1.
Embodiment 2
Being prepared as follows of the micro-foamed damping material of thermoplasticity in the present embodiment:
(1) prepare foaming master batch: by 15 parts of Cellmic C 121s, 45 parts of talcum powder, 35 parts of ethylene-vinyl acetate copolymers, after 100 parts of Low Density Polyethylenes add homogenizer fully to mix, utilize that twin screw extruder is extruded, granulation; Extrusion temperature is 140～145 ℃, and screw speed is 40r/min;
(2) prepare base-material: by 90 parts of polypropylene, 65 parts, thermoplastic styrene class elastomerics (TPS), 4 parts of 4 parts, mica and talcum powder, 4,1.0 parts of 4 '-sulfo-s (6-tertiary butyl-3-methylphenol), 18 parts of ethylene-vinyl acetate copolymers, 0.8 part of stearic acid adds stirrer high speed to be uniformly mixed 8min, then joins twin screw extruder and carries out granulation; Rotating speed is 180r/min, and Temperature Setting is 185～190 ℃, and water cooling bracing pelletizing becomes base-material;
(3) injection foaming: get above-mentioned gained base-material, then add 10 parts of foaming master batchs and be mixed to join injector hopper injection foaming and obtain product.
Twin screw extruder diameter 76mm described above, length-to-diameter ratio 40; Injector drying temperature is 80～90 ℃, and injection pressure is 55MPa, and be 2 seconds inject time, and barrel zone temperature is respectively 185～190 ℃, 195～200 ℃, 180～185 ℃, and nozzle temperature is 190～195 ℃, and die temperature is 25～30 ℃.Its properties test sees attached list 1.
Embodiment 3
Being prepared as follows of the micro-foamed damping material of thermoplasticity in the present embodiment:
(1) prepare foaming master batch: by 20 parts of Cellmic C 121s, 60 parts of talcum powder, 45 parts of ethylene-vinyl acetate copolymers, after 100 parts of Low Density Polyethylenes add homogenizer fully to mix, utilize that twin screw extruder is extruded, granulation; Extrusion temperature is 145～150 ℃, and screw speed is 40r/min;
(2) prepare base-material: by 80 parts of polypropylene, 70 parts of thermoplastic polyester elastomers (TPEE), 12 parts of titanium dioxides, [β-(3,5 di-t-butyl 4-hydroxyl-phenyl) propionic acid] 1.5 parts of pentaerythritol esters, 20 parts of ethylene-vinyl acetate copolymers, 1.2 parts of polyethylene waxs add stirrer high speed to be uniformly mixed 6min, then join twin screw extruder and carry out granulation; Rotating speed is 240r/min, and Temperature Setting is 185～190 ℃, and water cooling bracing pelletizing becomes base-material;
(3) injection foaming: get above-mentioned gained base-material, then add 18 parts of foaming master batchs and be mixed to join injector hopper injection foaming and obtain product.
Twin screw extruder diameter 76mm described above, length-to-diameter ratio 40; Injector drying temperature is 80～90 ℃, and injection pressure is 65MPa, and be 1 second inject time, and barrel zone temperature is respectively 190～195 ℃, 190～195 ℃, 180～185 ℃, and nozzle temperature is 185～190 ℃, and die temperature is 25～30 ℃.Its properties test sees attached list 1.
Embodiment 4
Being prepared as follows of the micro-foamed damping material of thermoplasticity in the present embodiment:
(1) prepare foaming master batch: by 25 parts of Cellmic C 121s, 55 parts of talcum powder, 40 parts of ethylene-vinyl acetate copolymers, after 100 parts of Low Density Polyethylenes add homogenizer fully to mix, utilize that twin screw extruder is extruded, granulation; Extrusion temperature is 145～150 ℃, and screw speed is 40r/min;
(2) prepare base-material: by 90 parts of polypropylene, 80 parts of thermoplastic polyester elastomers (TPEE), 0 part of silica 1,4,1.2 parts of 4 '-sulfo-s (6-tertiary butyl-3-methylphenol), 25 parts of Low Density Polyethylenes, 1.5 parts of stearic acid add stirrer high speed to be uniformly mixed 8min, then join twin screw extruder and carry out granulation; Rotating speed is 210r/min, and Temperature Setting is 180～185 ℃, and water cooling bracing pelletizing becomes base-material;
(3) injection foaming: get above-mentioned gained base-material, then add 15 parts of foaming master batchs and be mixed to join injector hopper injection foaming and obtain product.
Twin screw extruder diameter 76mm described above, length-to-diameter ratio 40; Injector drying temperature is 80～90 ℃, and injection pressure is 62MPa, and be 1.5 seconds inject time, and barrel zone temperature is respectively 185～190 ℃, 190～195 ℃, 175～180 ℃, and nozzle temperature is 185～190 ℃, and die temperature is 20～25 ℃.Its properties test sees attached list 1.
Comparative example 1
Being prepared as follows of the micro-foamed damping material of thermoplasticity (do not add thermoplastic elastomer, all the other steps are with embodiment 3) in the present embodiment:
(1) prepare foaming master batch: by 20 parts of Cellmic C 121s, 60 parts of talcum powder, 45 parts of ethylene-vinyl acetate copolymers, after 100 parts of Low Density Polyethylenes add homogenizer fully to mix, utilize that twin screw extruder is extruded, granulation; Extrusion temperature is 145～150 ℃, and screw speed is 40r/min;
(2) prepare base-material: by 80 parts of polypropylene, 12 parts of titanium dioxides, [β-(3,5 di-t-butyl 4-hydroxyl-phenyl) propionic acid] 1.5 parts of pentaerythritol esters, 20 parts of ethylene-vinyl acetate copolymers, 1.2 parts of polyethylene waxs add stirrer high speed to be uniformly mixed 6min, then join twin screw extruder and carry out granulation; Rotating speed is 240r/min, and Temperature Setting is 185～190 ℃, and water cooling bracing pelletizing becomes base-material;
(3) injection foaming: get above-mentioned gained base-material, then add 18 parts of foaming master batchs and be mixed to join injector hopper injection foaming and obtain product.
Twin screw extruder diameter 76mm described above, length-to-diameter ratio 40; Injector drying temperature is 80～90 ℃, and injection pressure is 65MPa, and be 1 second inject time, and barrel zone temperature is respectively 190～195 ℃, 190～195 ℃, 180～185 ℃, and nozzle temperature is 185～190 ℃, and die temperature is 25～30 ℃.Its properties test sees attached list 1.
Comparative example 2
Being prepared as follows of the micro-foamed damping material of thermoplasticity (do not prepare foaming master batch, all the other steps are with embodiment 4) in the present embodiment:
(1) prepare base-material: by 90 parts of polypropylene, 80 parts of thermoplastic polyester elastomers (TPEE), 0 part of silica 1,4,1.2 parts of 4 '-sulfo-s (6-tertiary butyl-3-methylphenol), 25 parts of Low Density Polyethylenes, 1.5 parts of stearic acid add stirrer high speed to be uniformly mixed 8min, then join twin screw extruder and carry out granulation; Rotating speed is 210r/min, and Temperature Setting is 180～185 ℃, and water cooling bracing pelletizing becomes base-material;
(2) injection foaming: get above-mentioned gained base-material, then add 15 parts of whipping agent Cellmic C 121s and be mixed to join injector hopper injection foaming and obtain product.
Twin screw extruder diameter 76mm described above, length-to-diameter ratio 40; Injector drying temperature is 80～90 ℃, and injection pressure is 62MPa, and be 1.5 seconds inject time, and barrel zone temperature is respectively 185～190 ℃, 190～195 ℃, 175～180 ℃, and nozzle temperature is 185～190 ℃, and die temperature is 20～25 ℃.Its properties test sees attached list 1.
Table 1
By every data in table 1, can be found out, the over-all properties of embodiment 3,4 is better, embodiment 1～4 is along with the variation of thermoplastic elastomer and viscosity modifier, and the obviously increase such as elongation at break and shock strength, compression set and oil-proofness cubical expansivity diminish, and tensile strength changes very little; By the contrast of comparative example 1 and embodiment 3, find that micro-its shock strength of foamed damping material of thermoplasticity and the elongation at break that do not add thermoplastic elastomer decline a lot, compression set is variation also; By the contrast of comparative example 2 and embodiment 4, find that micro-its compression set of foamed damping material of thermoplasticity and the oil-proofness cubical expansivity that do not add foaming master batch become large, shock strength also diminishes, and performance reduces.
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.Person skilled in the art obviously can easily make various modifications to these embodiment, and General Principle described herein is applied in other embodiment and needn't passes through performing creative labour.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not departing from the improvement that category of the present invention makes and revise all should be within protection scope of the present invention.
Claims (10)
1. the micro-foamed damping material of thermoplasticity, is characterized in that: by the component that comprises following weight part, made:
2. the micro-foamed damping material of thermoplasticity according to claim 1, is characterized in that: described polypropylene is selected from Co-polypropylene, and its melting index is 1.5～3g/10min.
3. the micro-foamed damping material of thermoplasticity according to claim 1, is characterized in that: described thermoplastic elastomer is selected from one or more in thermoplastic polyester elastomer, thermoplasticity Ethylene Propylene Terpolymer dynamic vulcanization elastomerics or thermoplastic styrene class elastomerics; Wherein, thermoplastic polyester elastomer is by terephthalic acid 1,4 butyleneglycols and poly-butanols copolymerization form, thermoplasticity Ethylene Propylene Terpolymer dynamic vulcanization elastomerics is formed in acrylic plastering matrix by terpolymer EP rubber microparticulate, and thermoplastic styrene class elastomerics is the multipolymer of divinyl or isoprene and styrene block type.
4. the micro-foamed damping material of thermoplasticity according to claim 1, is characterized in that: described filler is selected from one or more in titanium dioxide, mica, talcum powder or silicon-dioxide;
Or described oxidation inhibitor is selected from thio-2 acid octadecyl ester, [β-(3,5 di-t-butyl 4-hydroxyl-phenyl) propionic acid] pentaerythritol ester, Tyox B or 4, one or more in 4 '-sulfo-(6-tertiary butyl-3-methylphenol).
5. the micro-foamed damping material of thermoplasticity according to claim 1, is characterized in that: described viscosity modifier is selected from one or more in Low Density Polyethylene, acrylonitrile-butadiene-styrene terpolymer or ethylene-vinyl acetate copolymer;
Or described dispersion agent is selected from one or more in oleic acid, polyethylene wax or stearic acid.
6. the micro-foamed damping material of thermoplasticity according to claim 1, is characterized in that: described foaming master batch is made by the component that comprises following weight part:
7. the micro-foamed damping material of thermoplasticity according to claim 6, is characterized in that: described whipping agent is Cellmic C 121;
Or described nucleator is talcum powder;
Or described cladding is ethylene-vinyl acetate copolymer;
Or described foaming master batch vector resin is Low Density Polyethylene.
8. a preparation method for arbitrary described micro-foamed damping material of thermoplasticity in claim 1-7, is characterized in that: comprise the following steps:
(1) prepare foaming master batch: by 15～25 parts of whipping agents, 45～60 parts of nucleators, 30～45 parts of claddings, after 100 parts of foaming master batch vector resins add homogenizer fully to mix, utilize that twin screw extruder is extruded, granulation; Extrusion temperature is 140～150 ℃, and screw speed is 40r/min;
(2) prepare base-material: by 80～100 parts of polypropylene, 50～80 parts of thermoplastic elastomers, 8～15 parts of fillers, 1～2 part, oxidation inhibitor, 12～25 parts of viscosity modifiers, 0.8～1.5 part of dispersion agent adds stirrer high speed to be uniformly mixed 5～8min, then joins twin screw extruder and carries out granulation; Rotating speed is 180～240r/min, and Temperature Setting is 180～190 ℃, and water cooling bracing pelletizing becomes base-material;
(3) injection foaming: get in step 2 base-material of preparation, then add 10～18 parts of foaming master batchs and be mixed to join injector hopper injection foaming and obtain product.
9. preparation method according to claim 8, is characterized in that: twin screw extruder diameter 76mm in described step (1), length-to-diameter ratio 40.
10. preparation method according to claim 8, it is characterized in that: in described step (3), the concrete technology of injection foaming is: injector drying temperature is 80～90 ℃, injection pressure is 55～65MPa, be 1～2 second inject time, barrel zone temperature is respectively 185～195 ℃, 190～200 ℃, 175～185 ℃, nozzle temperature is 185～195 ℃, and die temperature is 20～30 ℃.
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