CN107603004A - It is electromagnetically shielded polymeric foamable material and preparation method thereof - Google Patents
It is electromagnetically shielded polymeric foamable material and preparation method thereof Download PDFInfo
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- CN107603004A CN107603004A CN201610555699.7A CN201610555699A CN107603004A CN 107603004 A CN107603004 A CN 107603004A CN 201610555699 A CN201610555699 A CN 201610555699A CN 107603004 A CN107603004 A CN 107603004A
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Abstract
The present invention relates to one kind to be electromagnetically shielded polymeric foamable material, and it includes polymer, nucleator and electro-magnetic screen function auxiliary agent.In addition, the present invention also provides a kind of preparation method for being electromagnetically shielded polymeric foamable material, it comprises the following steps:The constituent for being electromagnetically shielded polymeric foamable material is blended to form blend, is granulated by extruded type, obtains polymer particle, the constituent of the electromagnetic shielding polymeric foamable material includes polymer, nucleator and electro-magnetic screen function auxiliary agent；The polymer particle and appropriate water and co-foaming agent or foaming agent are put into autoclave, the temperature of autoclave is increased to predetermined temperature under agitation, constant temperature and pressure saturation, foaming agent is penetrated into the polymer particle, obtain the polymer pre-preg particle containing moisture and foaming agent；By autoclave fast pressure relief, polymer pre-preg particle rapid expanding is into polymer foaming particle；Processing is dried in polymer foaming particle.
Description
Technical field
The present invention relates to a kind of electromagnetic shielding material and preparation method thereof, more particularly to a kind of electromagnetic shielding polymer foaming
Material and preparation method thereof.
Background technology
Electromagnetic shielding (EMI shielding) refers to interference (the EMI Electromagnetic to the external world to electronic component
Interference shielding).Electromagnetic wave can be limited within the specific limits and be suppressed or decay by shielding action, from
And interference of the electromagnetic wave to electronic component is reduced, the Electro Magnetic Compatibility of lifting means is so as to improving product quality.It can realize
Electromagnetic shielding material can be referred to as by stating the material of function.Traditional electromagnetic shielding material includes metal and its composite.Gold
The category general density of material it is higher so as to it is overweight, its be easy to corrode easy oxidation, electric conductivity declines very fast.Also there are some tables in recent years
Face coats the electromagnetic shielding material of conductive carbon material, such as conductive black layer is adsorbed in open-celled polyurethane foam, in metal watch
Face deposited graphite alkene layer, in expanded polystyrene particle surface coating graphite etc..
Traditional metal and its composite electromagnetic shielding material weight weight, it is more difficult to be molded complicated product；Open-cell polyurethane
Foam (sponge) adsorbs conductive black or carries out surface covering metal, and metal, which is easy to oxidation, to make capability of electromagnetic shielding decline, easily
In the moisture absorption, adsorbent charcoal clandestine meeting dry linting causes hydraulic performance decline；Expanded polystyrene (EPS) surface coats electrically conductive graphite layer, and material is more crisp, table
The easy defect of layer so that hydraulic performance decline.
The content of the invention
In view of this, there is preferable capability of electromagnetic shielding it is necessory to provide one kind, and possesses light, easily prepared
Into it is various special-shaped, durable the advantages that electromagnetic shielding polymeric foamable material and preparation method thereof.
One kind electromagnetic shielding polymeric foamable material, it includes：Polymer, nucleator and electro-magnetic screen function auxiliary agent.
A kind of preparation method for being electromagnetically shielded polymeric foamable material, it comprises the following steps:Polymer will be electromagnetically shielded
The constituent of expanded material is blended to form blend, is granulated by extruded type, obtains polymer particle, the electromagnetic shielding polymerization
The constituent of thing expanded material includes polymer, nucleator and electro-magnetic screen function auxiliary agent；By the polymer particle with fitting
The water and co-foaming agent or foaming agent of amount are put into autoclave, are increased to make a reservation for by the temperature of autoclave under agitation
Temperature, constant temperature and pressure saturation, foaming agent is penetrated into the polymer particle, obtain the polymerization containing moisture and foaming agent
Thing pre-preg particle；By autoclave fast pressure relief, polymer pre-preg particle rapid expanding is into polymer foaming particle；Will polymerization
Processing is dried in thing expanded particle.
Compared with prior art, electromagnetic shielding polymeric foamable material provided by the invention has preferably electromagnetic shielding
Performance, and possess it is light, easily prepared into it is various special-shaped, durable the advantages that, have being electromagnetically shielded and inhaling the field such as ripple
It is widely applied prospect.Also, the preparation method for being electromagnetically shielded polymeric foamable material is simple, easy, and cost is relatively low.
Brief description of the drawings
Fig. 1 be polymer foaming particle in the embodiment of the present invention one expansion ratio (expansion ratio) be 15 times when
Electromicroscopic photograph.
Main element symbol description
Nothing
Following embodiment will combine above-mentioned accompanying drawing and further illustrate the present invention.
Embodiment
Below in conjunction with the accompanying drawings and the specific embodiments, to electromagnetic shielding polymeric foamable material provided by the invention and its system
Preparation Method is described in further detail.
The present invention provides a kind of electromagnetic shielding polymeric foamable material, and the electromagnetic shielding polymeric foamable material includes polymerization
Thing, nucleator and electro-magnetic screen function auxiliary agent.
The polymer is polypropylene, polyethylene, ethylene propylene copolymer, POE (OBC, POE), thermoplastic
The arbitrary composition of the polymer such as property polyurethane, polyimides, PLA and above polymer.
The nucleator is the silica of different meshes, talcum powder, calcium carbonate, clay, carbon black, inorganic oxide and
One or more than one kinds of combinations in inorganic salts including sodium carbonate sodium acid carbonate.
The electro-magnetic screen function auxiliary agent be carbon black, conductive black, graphene, graphite oxide, CNT, carbon fiber,
One or several kinds of combinations in metallic fiber.
It is appreciated that the electromagnetic shielding polymeric foamable material can also be any including antioxidant, filler, colouring agent etc.
Component or its combination.
The antioxidant be antioxidant 1010, antioxidant 1076, irgasfos 168, antioxidant DSTP, anti-oxidant DLTP etc. its
In it is a kind of or at least two compounding.
The filler is the one or several kinds in calcium carbonate, kaolin, glass fibre, talcum powder.
The preparation method of the electromagnetic shielding polymeric foamable material comprises the following steps:
Step 1：The constituent for being electromagnetically shielded polymeric foamable material is blended to form blend, is granulated by extruded type,
Polymer particle is obtained, the constituent of the electromagnetic shielding polymeric foamable material includes polymer, nucleator and electromagnetic screen
Cover function additive.
Step 2：The polymer particle and appropriate water and co-foaming agent or foaming agent are put into autoclave,
The temperature of autoclave is increased to predetermined temperature under stirring condition, constant temperature and pressure saturation, foaming agent is penetrated into the polymer
In particle, the polymer pre-preg particle containing moisture and foaming agent is obtained；
Step 3：By autoclave fast pressure relief, polymer pre-preg particle rapid expanding is into polymer foaming particle；
Step 4：Processing is dried in polymer foaming particle.
In the step 1, according to mass percent meter, in the blend, the content of the polymer for 68%~
94.9%, the content of nucleator is 0.1%~2%, and the content of electro-magnetic screen function auxiliary agent is 5~30%.
The constituent of the electromagnetic shielding polymeric foamable material may further include antioxidant, filler, colouring agent etc.
Any component or its combination.The content of the antioxidant is less than or equal to 2%, and the content of the filler is less than or equal to 20%, institute
The content for stating colouring agent is less than or equal to 5%.
The polymer can be polypropylene, polyethylene, ethylene propylene copolymer, POE (OBC, POE)
Deng the polymer such as olefin polymer, thermoplastic polyurethane, polyimides, PLA and the arbitrary composition of above polymer.
The nucleator can be silica, talcum powder, calcium carbonate, clay, carbon black, the inorganic oxide of different meshes
And one or more than one kinds of combinations in the inorganic salts including sodium carbonate sodium acid carbonate.The nucleator preferably compares
Example is 0.3%~2%.
The electro-magnetic screen function auxiliary agent can be carbon black, conductive black, graphene, graphite oxide, CNT, carbon fibre
One or several kinds of combinations in dimension, metallic fiber.
Described colouring agent wherein coloring components can be that organic dyestuff can also be inorganic pigment or share.
In the step 2, foaming agent and co-foaming agent can be carbon dioxide, nitrogen, propane, butane, pentane and
One or more kinds of mixtures in fluoric ether, content used are the 3~25% of polymer particle weight.It is described
Fluoric ether includes but is not limited to HFC-134a, HFC-245fa, HFC-152a, HFC-1234ze.
The saturation temperature is 70 DEG C~170 DEG C, saturation pressure is 0.1MPa~4.5MPa, saturation time is 0.5 hour
~8 hours.When organic foaming agent is used alone, its saturation temperature is 70~135 DEG C；When exclusive use inorganic foaming agent
When, its saturation temperature is 120~170 DEG C；When using inorganic and organic co-foaming agent, its saturation temperature scope is 80~165
℃；Saturation pressure is 0.1MPa~4.5MPa, preferably 0.3~4.0MPa of saturation pressure position, more preferably saturation pressure position 0.5~
3.5MPa；It is preferred that saturation time is 0.5 hour~6 hours.
In the step 4, the drying temperature of polymer foaming particle is 50 DEG C~95 DEG C, drying time be 10 minutes~
24 hours.
The electromagnetic screen polymer foaming particulate material prepared according to above-mentioned steps, its expansion multiplying power are 2 times~45 times；
According to above-mentioned steps prepare electromagnetic screen polymer foaming particulate material, its electromagnetic wave shielding energy range be 5dB~
35dB。
Embodiment one：
Polypropylene, antioxidant 1010, conductive black, talcum powder blending are added in double screw extruder, by weight percentage
Passed through than meter, polypropylene 84%, antioxidant 1010 0.2%, conductive black 15%, talcum powder 0.8%, blend at 200 DEG C
Twin-screw extrusion is transported to head, by 6 a diameter of 1.2mm of the head water cooled pelletizing of die extrusion, the polymerization obtained
Thing particle diameter is 0.8~1.5mm, and draw ratio is controlled 1：1 to 2：Between 1.
2 kilograms of polymer particles, 10 kilograms of water, 0.1 kilogram of pentane are added in autoclave, and add carbon dioxide,
Heat under agitation and be warming up to 133 DEG C, 137 DEG C, 142 DEG C respectively, keep autoclave pressure to be protected in 2.0MPa, constant temperature and pressure
Hold 1 hour so that pentane and carbon dioxide are sufficiently impregnated in polymer particle.Then by the autoclave in 15 seconds it is quick
Release, material in autoclave is sprayed by relief port, polymer particle in the process rapid expanding into possess electromagnetic shielding
The polymer foaming particle of performance.Prepared polymer foaming particle is dried 3 hours in 50 DEG C of baking ovens afterwards.
At three temperature the expansion ratio (expansion ratio) of prepared polymer foaming particle be respectively 5 times, 15
Again, 25 times, Fig. 1 show electromicroscopic photograph at 15 times.Capability of electromagnetic shielding is tested with above-mentioned particle respectively, the results showed that, its
Capability of electromagnetic shielding is respectively 25dB, 22dB, 20dB.
Embodiment two：
Polyethylene, conductive black, talcum powder blending are added in double screw extruder, by weight percentage, polyethylene
79.5%, conductive black 20%, talcum powder 0.5%, blend is transported to head through twin-screw extrusion at 190 DEG C, passes through machine
The first 6 a diameter of 1.2mm water cooled pelletizing of die extrusion, a diameter of 0.8~1.5mm of polymer particle obtained, major diameter
Than controlling 1：1 to 2：Between 1.
2 kilograms of polymer particles, 10 kilograms of water are added in autoclave, and add carbon dioxide, under agitation
Heating is warming up to 120 DEG C, 124 DEG C, 128 DEG C respectively, keeps autoclave pressure to be kept for 1 hour in 2.5MPa, constant temperature and pressure so that
Carbon dioxide is sufficiently impregnated in polymer particle.Then by the autoclave in 15 seconds fast pressure relief, make material in autoclave
Sprayed by relief port, polymer particle in the process rapid expanding into the polymer foaming grain for possessing capability of electromagnetic shielding
Son.Prepared polymer foaming particle is dried 3 hours in 50 DEG C of baking ovens afterwards.
The expansion ratio of prepared polymer foaming particle is respectively 5 times, 8 times, 12 times at three temperature, respectively with above-mentioned
Particle tests capability of electromagnetic shielding, the results showed that, its capability of electromagnetic shielding is respectively 30dB, 25dB, 22dB.
Embodiment three：
POE (OBC), conductive black, talcum powder blending are added in double screw extruder, by weight hundred
Divide and be transported to head through twin-screw extrusion at 190 DEG C than meter, OBC84%, conductive black 15%, talcum powder 1%, blend,
By 6 a diameter of 1.2mm of the head water cooled pelletizing of die extrusion, the polymer particle a diameter of 0.8 obtained~
1.5mm, draw ratio are controlled 1：1 to 2：Between 1.
2 kilograms of polymer particles, 10 kilograms of water are added in autoclave, and add carbon dioxide, under agitation
Heating is warming up to 118 DEG C, 123 DEG C, 128 DEG C respectively, keeps autoclave pressure to be kept for 1 hour in 2.5MPa, constant temperature and pressure so that
Carbon dioxide is sufficiently impregnated in polymer particle.Then by the autoclave in 15 seconds fast pressure relief, make material in autoclave
Sprayed by relief port, polymer particle in the process rapid expanding into the polymer foaming grain for possessing capability of electromagnetic shielding
Son.Prepared polymer foaming particle is dried 3 hours in 50 DEG C of baking ovens afterwards.
The expansion ratio of prepared polymer foaming particle is respectively 4 times, 7 times, 11 times at three temperature, respectively with above-mentioned
Particle tests capability of electromagnetic shielding, the results showed that, its capability of electromagnetic shielding is respectively 28dB, 24dB, 20dB.
Example IV：
Polyethylene, POE (OBC), conductive black, talcum powder blending are added in double screw extruder, pressed
Percentage by weight meter, polyethylene 70%, OBC14%, conductive black 15%, talcum powder 1%, blend is at 190 DEG C through double spiral shells
Bar extrusion is transported to head, by 6 a diameter of 1.2mm of the head water cooled pelletizing of die extrusion, the polymer beads obtained
A diameter of 0.8~the 1.5mm of son, draw ratio are controlled 1：1 to 2：Between 1.
2 kilograms of polymer particles, 10 kilograms of water are added in autoclave, and add carbon dioxide, under agitation
Heating is warming up to 119 DEG C, 122 DEG C, 125 DEG C respectively, keeps autoclave pressure to be kept for 1 hour in 2.5MPa, constant temperature and pressure so that
Carbon dioxide is sufficiently impregnated in polymer particle.Then by the autoclave in 15 seconds fast pressure relief, make material in autoclave
Sprayed by relief port, polymer particle in the process rapid expanding into the polymer foaming grain for possessing capability of electromagnetic shielding
Son.Prepared polymer foaming particle is dried 3 hours in 50 DEG C of baking ovens afterwards.
The expansion ratio of prepared polymer foaming particle is respectively 5 times, 8 times, 12 times at three temperature, respectively with above-mentioned
Particle tests capability of electromagnetic shielding, the results showed that, its capability of electromagnetic shielding is respectively 28dB, 24dB, 20dB.
Embodiment five：
Polypropylene, POE (OBC), conductive black, talcum powder blending are added in double screw extruder, pressed
Percentage by weight meter, polypropylene 60%, OBC20%, conductive black 19.5%, talcum powder 0.5%, blend pass through at 200 DEG C
Twin-screw extrusion is transported to head, by 6 a diameter of 1.2mm of the head water cooled pelletizing of die extrusion, the polymerization obtained
Thing particle diameter is 0.8~1.5mm, and draw ratio is controlled 1：1 to 2：Between 1.
2 kilograms of polymer particles, 10 kilograms of water are added in autoclave, and add carbon dioxide, under agitation
Heating is warming up to 130 DEG C, 134 DEG C, 139 DEG C respectively, keeps autoclave pressure to be kept for 1 hour in 2.5MPa, constant temperature and pressure so that
Carbon dioxide is sufficiently impregnated in polymer particle.Then by the autoclave in 15 seconds fast pressure relief, make material in autoclave
Sprayed by relief port, polymer particle in the process rapid expanding into the polymer foaming grain for possessing capability of electromagnetic shielding
Son.Prepared polymer foaming particle is dried 3 hours in 50 DEG C of baking ovens afterwards.
The expansion ratio of prepared polymer foaming particle is respectively 8 times, 15 times, 20 times at three temperature, more than difference
State particle test capability of electromagnetic shielding, the results showed that, its capability of electromagnetic shielding is respectively 32dB, 28dB, 25dB.
Embodiment six：
Polypropylene, POE (POE), conductive black, talcum powder blending are added in double screw extruder, pressed
Percentage by weight meter, polypropylene 60%, POE20%, conductive black 19.5%, talcum powder 0.5%, blend pass through at 200 DEG C
Twin-screw extrusion is transported to head, by 6 a diameter of 1.2mm of the head water cooled pelletizing of die extrusion, the polymerization obtained
Thing particle diameter is 0.8~1.5mm, and draw ratio is controlled 1：1 to 2：Between 1.
2 kilograms of polymer particles, 10 kilograms of water are added in autoclave, and add carbon dioxide, under agitation
Heating is warming up to 131 DEG C, 135 DEG C, 140 DEG C respectively, keeps autoclave pressure to be kept for 1 hour in 2.5MPa, constant temperature and pressure so that
Carbon dioxide is sufficiently impregnated in polymer particle.Then by the autoclave in 15 seconds fast pressure relief, make material in autoclave
Sprayed by relief port, polymer particle in the process rapid expanding into the polymer foaming grain for possessing capability of electromagnetic shielding
Son.Prepared expanded particle is dried 3 hours in 50 DEG C of baking ovens afterwards.
The expansion ratio of prepared polymer foaming particle is respectively 8 times, 15 times, 20 times at three temperature, more than difference
State particle test capability of electromagnetic shielding, the results showed that, its capability of electromagnetic shielding is respectively 32dB, 28dB, 25dB.
Embodiment seven：
Polypropylene, antioxidant 1010, conductive black, graphene, talcum powder blending are added in double screw extruder, by weight
Percentages are measured, polypropylene 84.8%, antioxidant 1010 0.2%, conductive black 10%, graphene 3%, talcum powder 2% are common
Mixed thing is transported to head at 200 DEG C through twin-screw extrusion, is cut by the way that 6 a diameter of 1.2mm of head die extrusion is water cooled
Grain, a diameter of 0.8~1.5mm of polymer particle obtained, draw ratio are controlled 1：1 to 2：Between 1.
2 kilograms of polymer particles, 10 kilograms of water, 0.1 kilogram of pentane are added in autoclave, and add carbon dioxide,
Heat under agitation and be warming up to 133 DEG C, 137 DEG C, 142 DEG C respectively, keep autoclave pressure to be protected in 2.0MPa, constant temperature and pressure
Hold 1 hour so that pentane and carbon dioxide are sufficiently impregnated in polymer particle.Then by the autoclave in 15 seconds it is quick
Release, material in autoclave is sprayed by relief port, polymer particle in the process rapid expanding into possess electromagnetic shielding
The polymer foaming particle of performance.Prepared polymer foaming particle is dried 3 hours in 50 DEG C of baking ovens afterwards.
The expansion ratio of prepared polymer foaming particle is respectively 6 times, 17 times, 25 times at three temperature, respectively to upper
State particle test capability of electromagnetic shielding, the results showed that, its capability of electromagnetic shielding is respectively 30dB, 27dB, 24dB.
Embodiment eight：
Polypropylene, graphene, talcum powder blending are added in double screw extruder, by weight percentage, polypropylene
92%, graphene 6%, talcum powder 2%, blend are transported to head at 200 DEG C through twin-screw extrusion, straight by head 6
Footpath is the 1.2mm water cooled pelletizing of die extrusion, and a diameter of 0.8~1.5mm of polymer particle obtained, draw ratio, which controls, to exist
1：1 to 2：Between 1.
2 kilograms of polymer particles, 10 kilograms of water, 0.1 kilogram of pentane are added in autoclave, and add carbon dioxide,
Heat under agitation and be warming up to 133 DEG C, 137 DEG C, 142 DEG C respectively, keep autoclave pressure to be protected in 2.5MPa, constant temperature and pressure
Hold 1 hour so that pentane and carbon dioxide are sufficiently impregnated in polymer particle.Then by the autoclave in 15 seconds it is quick
Release, material in autoclave is sprayed by relief port, polymer particle in the process rapid expanding into possess electromagnetic shielding
The polymer foaming particle of performance.Prepared polymer foaming particle is dried 3 hours in 50 DEG C of baking ovens afterwards.
The expansion ratio of prepared polymer foaming particle is respectively 8 times, 18 times, 25 times at three temperature, respectively to upper
State particle test capability of electromagnetic shielding, the results showed that, its capability of electromagnetic shielding is respectively 28dB, 24dB, 20dB.
Embodiment nine：
Polypropylene, CNT, talcum powder blending are added in double screw extruder, by weight percentage, polypropylene
89%, CNT 10%, talcum powder 1%, blend are transported to head at 200 DEG C through twin-screw extrusion, by head 6
The a diameter of 1.2mm water cooled pelletizing of die extrusion, a diameter of 0.8~1.5mm of polymer particle obtained, draw ratio control
1：1 to 2：Between 1.
2 kilograms of polymer particles, 10 kilograms of water are added in autoclave, and add carbon dioxide, under agitation
Heating is warming up to 137 DEG C, 139 DEG C, 143 DEG C respectively, keeps autoclave pressure to be kept for 1 hour in 2.5MPa, constant temperature and pressure so that
Carbon dioxide is sufficiently impregnated in polymer particle.Then by the autoclave in 15 seconds fast pressure relief, make material in autoclave
Sprayed by relief port, polymer particle in the process rapid expanding into the polymer foaming grain for possessing capability of electromagnetic shielding
Son.Prepared polymer foaming particle is dried 3 hours in 50 DEG C of baking ovens.
The expansion ratio of prepared polymer foaming particle is respectively 5 times, 12 times, 20 times at three temperature, respectively to upper
State particle test capability of electromagnetic shielding, the results showed that, its capability of electromagnetic shielding is respectively 29dB, 25dB, 21dB.
Embodiment ten：
Polypropylene, carbon fiber, talcum powder blending are added in double screw extruder, by weight percentage, polypropylene
83%, carbon fiber 6%, talcum powder 1%, blend are transported to head at 200 DEG C through twin-screw extrusion, straight by head 6
Footpath is the 1.2mm water cooled pelletizing of die extrusion, and a diameter of 0.8~1.5mm of polymer particle obtained, draw ratio, which controls, to exist
1：1 to 2：Between 1.
2 kilograms of polymer particles, 10 kilograms of water, 0.1 kilogram of pentane are added in autoclave, and add carbon dioxide,
Heat under agitation and be warming up to 135 DEG C, 139 DEG C, 143 DEG C respectively, keep autoclave pressure to be protected in 2.5MPa, constant temperature and pressure
Hold 1 hour so that pentane and carbon dioxide are sufficiently impregnated in polymer particle.Then by the autoclave in 15 seconds it is quick
Release, material in autoclave is sprayed by relief port, polymer particle in the process rapid expanding into possess electromagnetic shielding
The expanded particle of performance.Prepared polymer foaming particle is dried 3 hours in 50 DEG C of baking ovens afterwards.
The expansion ratio of prepared polymer foaming particle is respectively 6 times, 15 times, 20 times at three temperature, respectively to upper
State particle test capability of electromagnetic shielding, the results showed that, its capability of electromagnetic shielding is respectively 30dB, 25dB, 20dB.
Embodiment 11：
Polypropylene, PLA, conductive black, CNT, talcum powder blending are added in double screw extruder, by weight
Percentages, polypropylene 75%, PLA 10%, conductive black 10%, CNT 4%, talcum powder 1%, blend is 200
Head is transported to through twin-screw extrusion at DEG C, by 6 a diameter of 1.2mm of the head water cooled pelletizing of die extrusion, is obtained
The a diameter of 0.8~1.5mm of polymer particle, draw ratio control 1：1 to 2：Between 1.
2 kilograms of polymer particles, 10 kilograms of water, 0.1 kilogram of pentane are added in autoclave, and add carbon dioxide,
Heat under agitation and be warming up to 135 DEG C, 139 DEG C, 143 DEG C respectively, keep autoclave pressure to be protected in 2.0MPa, constant temperature and pressure
Hold 1 hour so that pentane and carbon dioxide are sufficiently impregnated in polymer particle.Then by the autoclave in 15 seconds it is quick
Release, material in autoclave is sprayed by relief port, polymer particle in the process rapid expanding into possess electromagnetic shielding
The polymer foaming particle of performance.Prepared polymer foaming particle is dried 3 hours in 50 DEG C of baking ovens.
The expansion ratio of prepared polymer foaming particle is respectively 6 times, 15 times, 20 times at three temperature, respectively to upper
State particle test capability of electromagnetic shielding, the results showed that, its capability of electromagnetic shielding is respectively 30dB, 25dB, 20dB.
Embodiment 12：
Thermoplastic polyurethane, conductive black, talcum powder blending are added in double screw extruder, by weight percentage,
Thermoplastic polyurethane 79%, conductive black 20%, talcum powder 1%, blend are transported to machine at 200 DEG C through twin-screw extrusion
Head, polymer particle is obtained by granulation underwater, the polymer particle particle diameter obtained is 2~5mm.
2 kilograms of polymer particles, 10 kilograms of water, 0.4 kilogram of pentane are added in autoclave, and add carbon dioxide,
Heat under agitation and be warming up to 145 DEG C, 149 DEG C, 152 DEG C respectively, keep autoclave pressure to be protected in 4.0MPa, constant temperature and pressure
Hold 1 hour so that pentane and carbon dioxide are sufficiently impregnated in polymer particle.Then by the autoclave in 15 seconds it is quick
Release, material in autoclave is sprayed by relief port, polymer particle in the process rapid expanding into possess electromagnetic shielding
The polymer foaming particle of performance.Prepared polymer foaming particle is dried 3 hours in 50 DEG C of baking ovens afterwards.
The expansion ratio of prepared polymer foaming particle is respectively 4 times, 6 times, 8 times at three temperature, respectively to above-mentioned
Particle tests capability of electromagnetic shielding, the results showed that, its capability of electromagnetic shielding is respectively 32dB, 28dB, 24dB.
Embodiment 13：
The blendings such as thermoplastic polyurethane, conductive black, graphene talcum powder are added in double screw extruder, by weight hundred
Divide than meter, thermoplastic polyurethane 86%, conductive black 10%, graphene 3%, talcum powder 1%, blend is at 200 DEG C through double
Screw Extrusion is transported to head, obtains polymer particle by granulation underwater, the polymer particle particle diameter obtained is 2~5mm.
2 kilograms of polymer particles, 10 kilograms of water are added in autoclave, and add carbon dioxide, under agitation
Heating is warming up to 145 DEG C, 149 DEG C, 152 DEG C respectively, keeps autoclave pressure to be kept for 1 hour in 4.5MPa, constant temperature and pressure so that
Carbon dioxide is sufficiently impregnated in polymer particle.Then by the autoclave in 15 seconds fast pressure relief, make material in autoclave
Sprayed by relief port, polymer particle in the process rapid expanding into the polymer foaming grain for possessing capability of electromagnetic shielding
Son.Prepared polymer foaming particle is dried 3 hours in 50 DEG C of baking ovens.
The expansion ratio of prepared polymer foaming particle is respectively 3 times, 5 times, 7 times at three temperature, respectively to above-mentioned
Particle tests capability of electromagnetic shielding, the results showed that, its capability of electromagnetic shielding is respectively 32dB, 28dB, 24dB.
Embodiment 14：
Polypropylene, polyethylene, antioxidant 1010, conductive black, talcum powder blending are added in double screw extruder, by weight
Amount percentages, polypropylene 60%, polyethylene 10%, antioxidant 1010 0.2%, conductive black 29%, talcum powder 0.8%,
Blend is transported to head at 200 DEG C through twin-screw extrusion, and the die extrusion by 6 a diameter of 1.2mm of head is water cooled
Pelletizing, a diameter of 0.8~1.5mm of polymer particle obtained, draw ratio are controlled 1：1 to 2：Between 1.
2 kilograms of polymer particles, 10 kilograms of water are added in autoclave, and add carbon dioxide, under agitation
Heating is warming up to 133 DEG C, 137 DEG C, 142 DEG C respectively, keeps autoclave pressure to be kept for 1 hour in 2.0MPa, constant temperature and pressure so that
Carbon dioxide is sufficiently impregnated in polymer particle.Then by the autoclave in 15 seconds fast pressure relief, make material in autoclave
Sprayed by relief port, polymer particle in the process rapid expanding into the polymer foaming grain for possessing capability of electromagnetic shielding
Son.Prepared polymer foaming particle is dried 3 hours in 50 DEG C of baking ovens afterwards.
The expansion ratio of prepared polymer foaming particle is respectively 8 times, 16 times, 25 times at three temperature.More than respectively
State particle test capability of electromagnetic shielding, the results showed that, its capability of electromagnetic shielding is respectively 35dB, 32dB, 28dB.
Embodiment 15：
The blendings such as polypropylene, conductive black, talcum powder are added in double screw extruder, by weight percentage, poly- third
Alkene 89.2%, conductive black 10%, talcum powder 0.8%, blend are transported to head through twin-screw extrusion at 200 DEG C, passed through
6 a diameter of 1.2mm of the head water cooled pelletizing of die extrusion, a diameter of 0.8~1.5mm of polymer particle obtained are long
Footpath is than control 1：1 to 2：Between 1.
2 kilograms of polymer particles, 10 kilograms of water are added in autoclave, and add carbon dioxide, under agitation
Heating is warming up to 135 DEG C, 139 DEG C, 144 DEG C respectively, keeps autoclave pressure to be kept for 1 hour in 2.5MPa, constant temperature and pressure so that
Carbon dioxide is sufficiently impregnated in polymer particle.Then by the autoclave in 15 seconds fast pressure relief, make material in autoclave
Sprayed by relief port, polymer particle in the process rapid expanding into the polymer foaming grain for possessing capability of electromagnetic shielding
Son.Prepared polymer foaming particle is dried 3 hours in 50 DEG C of baking ovens afterwards.
The expansion ratio of prepared polymer foaming particle is respectively 5 times, 16 times, 25 times at three temperature.More than respectively
State particle test capability of electromagnetic shielding, the results showed that, its capability of electromagnetic shielding is respectively 12dB, 8dB, 6dB.
According to above-mentioned steps prepare the polymer foaming particle for possessing capability of electromagnetic shielding, its expansion multiplying power be 2 times~
45 times；Its electromagnetic wave shielding energy range is 5dB~35dB.
The electromagnetic shielding polymeric foamable material that the present embodiment provides has preferable capability of electromagnetic shielding, and possesses matter
Gently, it is easily prepared into it is various special-shaped, durable the advantages that, be with a wide range of applications being electromagnetically shielded and inhaling the field such as ripple.
Also, the preparation method for being electromagnetically shielded polymeric foamable material is simple, easy, and cost is relatively low.
In addition, those skilled in the art can also do other changes in spirit of the invention, these are according to present invention spirit
The change done, it should all be included in scope of the present invention.
Claims (10)
1. one kind electromagnetic shielding polymeric foamable material, it includes：Polymer, nucleator and electro-magnetic screen function auxiliary agent.
2. electromagnetic shielding polymeric foamable material as claimed in claim 1, it is characterised in that：Further comprise antioxidant, fill out
Material, one kind in colouring agent or at least two combination.
3. electromagnetic shielding polymeric foamable material as claimed in claim 1, it is characterised in that：The polymer be polypropylene,
One in polyethylene, ethylene propylene copolymer, POE, thermoplastic polyurethane, polyimides, polylactic acid polymer
Kind or at least two composition；The electro-magnetic screen function auxiliary agent is carbon black, conductive black, graphene, graphite oxide, nanometer
A kind of in carbon pipe, carbon fiber, metallic fiber or at least two combination.
4. electromagnetic shielding polymeric foamable material as claimed in claim 1, it is characterised in that：The nucleator is titanium dioxide
One kind or at least two combination in silicon, talcum powder, calcium carbonate, clay, carbon black, inorganic oxide either include sodium carbonate
One kind in inorganic salts or at least two combination including sodium acid carbonate.
5. a kind of preparation method for being electromagnetically shielded polymeric foamable material, it comprises the following steps:
The constituent for being electromagnetically shielded polymeric foamable material is blended to form blend, is granulated by extruded type, obtains polymer
Particle, the constituent of the electromagnetic shielding polymeric foamable material include polymer, nucleator and electro-magnetic screen function auxiliary agent；
The polymer particle and appropriate water and co-foaming agent or foaming agent are put into autoclave, under agitation
The temperature of autoclave is increased to predetermined temperature, constant temperature and pressure saturation, foaming agent is penetrated into the polymer particle, obtains
Polymer pre-preg particle containing moisture and foaming agent；
By autoclave fast pressure relief, polymer pre-preg particle rapid expanding is into polymer foaming particle；
Processing is dried in polymer foaming particle.
6. the preparation method of electromagnetic shielding polymeric foamable material as claimed in claim 5, it is characterised in that：The polymer
Content be 68%~94.9%, the content of the nucleator is 0.1%~2%, the content of the electro-magnetic screen function auxiliary agent
For 5~30%.
7. the preparation method of electromagnetic shielding polymeric foamable material as claimed in claim 5, it is characterised in that：The foaming agent
It is one or more kinds of mixed in carbon dioxide, nitrogen, propane, butane, pentane and fluoric ether with co-foaming agent
Compound.
8. the preparation method of electromagnetic shielding polymeric foamable material as claimed in claim 5, it is characterised in that：The saturation temperature
Spend for 70 DEG C~170 DEG C, saturation pressure be 0.1MPa~4.5MPa, saturation time be 0.5 hour~8 hours.
9. the preparation method of electromagnetic shielding polymeric foamable material as claimed in claim 5, it is characterised in that：Work as exclusive use
During organic foaming agent, the saturation temperature is 70~135 DEG C；When inorganic foaming agent is used alone, the saturation temperature is
120~170 DEG C；When using inorganic and organic co-foaming agent, the saturation temperature scope is 80~165 DEG C；Saturation pressure is
0.1MPa~4.5MPa；Saturation time is 0.5 hour~6 hours.
10. the preparation method of electromagnetic shielding polymeric foamable material as claimed in claim 5, it is characterised in that：By described
Electromagnetic shielding polymeric foamable material prepared by method, its expansion ratio are 2 times~45 times；Its electromagnetic wave shielding energy range is
5dB~35dB.
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| CN110791079A (en) * | 2019-10-18 | 2020-02-14 | 蔡娟 | Co3O4-composite electromagnetic shielding material of carbon nano tube modified polyurethane |
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| CN112251013A (en) * | 2020-11-05 | 2021-01-22 | 成都佳驰电子科技有限公司 | Low RCS test carrier of light broadband wave-absorbing composite material |
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| CN108948479A (en) * | 2018-04-27 | 2018-12-07 | 厦门谱睿科技有限公司 | A kind of antistatic packaging material |
| CN111171553A (en) * | 2018-11-13 | 2020-05-19 | 柴浣兰 | Electromagnetic wave shielding composite material |
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| CN113754954A (en) * | 2021-08-24 | 2021-12-07 | 无锡敬仁电子材料科技有限公司 | Foamed polymer wave-absorbing material with high porosity and high closed porosity and preparation method thereof |
| CN114633528A (en) * | 2022-03-22 | 2022-06-17 | 江苏万华拓谷新材料科技有限公司 | Composite material with wave-absorbing and electromagnetic shielding properties and preparation method thereof |
| CN115477813A (en) * | 2022-11-01 | 2022-12-16 | 飞荣达科技(江苏)有限公司 | PP-based composite material for electromagnetic shielding and preparation method thereof |
| CN115477813B (en) * | 2022-11-01 | 2024-02-20 | 飞荣达科技(江苏)有限公司 | PP-based composite material for electromagnetic shielding and preparation method thereof |
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