CN104017331B - A kind of insulating and heat-conducting plastics and its preparation method - Google Patents
A kind of insulating and heat-conducting plastics and its preparation method Download PDFInfo
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- CN104017331B CN104017331B CN201410221717.9A CN201410221717A CN104017331B CN 104017331 B CN104017331 B CN 104017331B CN 201410221717 A CN201410221717 A CN 201410221717A CN 104017331 B CN104017331 B CN 104017331B
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Abstract
The present invention relates to a kind of novel insulating and heat-conducting plastics and its preparation method, described plastics comprise base-material, modified Nano alumina particle, modified graphene, hollow glass micro-ball, barium stearate, distearyl oxygen sec.-propyl aluminic acid ester, stablizer and toughner. Described preparation method adds modified Nano alumina particle and modified graphene by two-part, thus can obtain the above-mentioned insulating and heat-conducting plastics with excellent properties. The described plastics of the present invention and preparation method have good industrial applications prospect and marketable value.
Description
Technical field
The present invention relates to a kind of plastics and its preparation method, relate more specifically to a kind of insulating and heat-conducting plastics its preparation method, belong to engineering plastics technical field.
Background technology
It is a kind of purposes macromolecular material widely that plastics (are also called resin), it has extremely important effect in multiple field is such as numerous areas such as coating, dyestuff, tackiness agent, weavings, thus application quantity is huge in the world, becoming affects at present us and lives one of essential material.
Among plastics of a great variety, insulativity heat-conducting plastic owing to overcoming many defects of metallic substance, such as poor insulativity, easy to use etc., and popular, such as can be used in the field such as power industry, electronic industry, thus prospect in an increasingly wide range of applications and potentiality.
On the other hand, along with the fast development of electronic industry, particularly owing to the integrated level of microelectronics is more and more higher, density, the volume of electronic devices and components and circuit more and more less, thus for having good insulation properties, the engineering plastics of thermal conductivity have urgent demand. Except electronic industry, in power industry, owing to the voltage of delivery circuit is more and more higher, in the embody rule such as transformation station, for having high-insulativity, the engineering plastics of thermal conductive resin have increasing demand equally.
Just due to the purposes like this of insulating and heat-conducting plastics, thus arouse great concern, and carried out a large amount of further investigations, also achieve certain achievement.
CN101899209A discloses a kind of heat-conducting insulation material and its preparation method, and described material is made up of plastic substrate, heat-conductive insulation filling A, heat-conductive insulation filling B, mineral fibre C, coupling agent and lubricant, has good heat conductive insulating performance.
CN103602060A discloses a kind of heat conduction abrasion-proof insulating nylon 6 composite material and its preparation method, and described material comprises the composition such as PA6, threadiness heat conductive filler, insulating heat-conductive powder A, insulating heat-conductive powder B, heat conduction abrasion-resistant powder, coupling agent, compatilizer, oxidation inhibitor, lubricant.
CN103524995A discloses a kind of high heat conductive insulating plastics, described plastics mainly comprise plastic insulation matrix and heat-conductive insulation filling, and its consumption is plastic insulation matrix 100-200 part, heat-conductive insulation filling 200-800 part, coupling agent 2-50 part, oxidation inhibitor 1-5 part, dispersion agent 1-10 part, toughener 20-50 part and processing aid 0.5-5 part.
CN103483809A discloses a kind of high-fluidity polyamide base halogen-free flame-retarded heat-conducting matrix material and its preparation method, described material comprises nylon resin, heat conductive filler, halogen-free flame retardants, oxidation inhibitor and coupling agent, and described material has many performances such as thermal conductivity height, fluidity of molten height, environmental protection flame retardant.
CN103524836A discloses a kind of antibacterial heat-conducting plastic, described plastics are made up of HDPE, formaldehyde, aluminium hydroxide, clorafin, triethylene tetramine, zirconium white, methyl alcohol and dicumyl peroxide, described plastics have good antimicrobial property, and it is powerful and have good insulating property not affect machinery.
CN103554900A discloses a kind of moulded heat-conductive insulated plastics containing special construction carbon nanotube filler and its preparation method, and described plastics are made up of fluoropolymer resin, inorganic powder, special construction carbon nanotube, coupling agent, lubricant and oxidation inhibitor.
CN103665850A discloses a kind of heat conductive insulating resin combination, and described composition comprises the compositions such as polymeric amide, filler, coupling agent, toughner, hydrolysis agent, stablizer, lubricant, nucleator.
CN103665741A discloses a kind of Insulation type heat conductive composite plastic cement, described plastic cement comprises ABS, carbon dust, BPS, magnesium hypophosphite, tetramethylolmethane, melamine cyanurate salt, diatomite, sepiolite, polyolefin plastics, dioxane, sodium salicylate, alum and kaolin, and this material can increase substantially heat transfer efficiency.
CN103554907A discloses a kind of heat-conducting plastic, and described plastics comprise thermoplastic resin, steel fiber, halogen-free flame retardants, dispersion agent, lubricant and oxidation inhibitor.
CN103571185A discloses a kind of engineering plastics and its preparation method with high thermal conductivity, described plastics comprise matrix resin, mica powder, insulating heat-conductive filler, fire retardant and processing aid, it has excellent heat conductivility and excellent mechanical property, it is possible to meet the requirement of high heat conduction and high flame retardant.
CN103483817A discloses a kind of insulating and heat-conducting plastics and its preparation method, described plastics comprise polyphenylene sulfide, epoxy resin, PVC, dione compounds, naphthoic acid cobalt, talcum powder, Vinyl Acetate Copolymer, resorcinol formaldehyde resin, trioxymethylene, dibutyl phthalate, and it has good heat conductivility and insulating property.
As mentioned above, although prior art discloses the multiple plastics with thermal conductive resin and insulating property, but the research and development for this material still also exist the demand proceeding to improve, this is also one of research focus and emphasis in this field current, the power place that the present invention is accomplished especially, the present invention is intended to a kind of novel insulating and heat-conducting plastics of development, it is by the suitable screening of component and particular combination, make gained plastics surprisingly show excellent thermal conductivity and insulativity, there is industrial applications prospect and marketable value widely.
Summary of the invention
In order to obtain novel insulating and heat-conducting plastics and its preparation method, the present inventor, to this has been further investigation, is paying a large amount of creative works and after going deep into experimental exploring, thus is completing the present invention.
Specifically, the present invention relates generally to two aspects.
First aspect, the present invention relates to a kind of novel insulating and heat-conducting plastics, described insulating and heat-conducting plastics comprises base-material, modified Nano alumina particle, modified graphene, hollow glass micro-ball, barium stearate, distearyl oxygen sec.-propyl aluminic acid ester, stablizer and toughner.
In the described insulating and heat-conducting plastics of the present invention, with parts by weight, its concrete component concentration is as follows:
In the described insulating and heat-conducting plastics of the present invention, described base-material is the mixture of bisphenol A type epoxy resin, polyphthalamide and ABS resin. Wherein, the weight ratio of bisphenol A type epoxy resin, polyphthalamide and ABS resin is 1:1-3:2-4, such as, can be 1:1:2,1:1:3,1:1:4,1:2:2,1:2:3,1:2:4,1:3:2,1:3:3,1:3:4.
In the described insulating and heat-conducting plastics of the present invention, the weight part of described modified Nano aluminum oxide is 1-3 part, such as, can be 1 part, 2 parts or 3 parts.
Wherein, described modified Nano aluminum oxide obtains according to following preparation method, or says, the preparation method of described modified Nano aluminum oxide is as follows:
Step (1): by aluminum chloride (AlCl3) or aluminum nitrate (Al (NO3)3) join in triethylene glycol, stir and evenly obtain reaction precursor liquid, then the NaOH aqueous solution is joined in this reaction precursor liquid, and at room temperature stir 1-2 hour, then to 180-220 DEG C and 2-3 hour is reacted with the temperature rise rate raised temperature of 40-50 DEG C/min, naturally cooling is precipitated, and centrifugation obtains solid; The mixture of this solid acetoneand ethyl acetate, ethanol, deionized water are washed in turn, dry, obtain a nanometer Al2O3Particle;
Step (2): under ultrasound condition, nanometer Al obtained by step (1)2O3Granular composite is in dehydrated alcohol, the ethanol solution of positive isopropyl silicate is added wherein after being uniformly dispersed, then ammonium bicarbonate aqueous solution is added, at room temperature stirring reaction 2-3 hour, centrifugation obtains solid, by gained solid successively with acetone, dehydrated alcohol and deionized water wash, and vacuum-drying, obtain modified Nano alumina particle, namely silica modified nano alumina particles.
In described step (1), the mass percentage concentration of the NaOH aqueous solution can be 10-30%, such as, can be 10%, 20% or 30%.
Wherein, AlCl3With NaOH or Al (NO3)3It is 1:3-5 with the mol ratio of NaOH, such as, can be 1:3,1:4 or 1:5.
In described step (2), nanometer Al of step (1)2O3The weight ratio of particle and positive isopropyl silicate is 1:1-3, such as, can be 1:1,1:1.5,1:2,1:2.5 or 1:3.
Wherein, the amount of the ammonium bicarbonate aqueous solution added is not particularly limited, as long as it can make reaction system keep alkalescence, the pH of such as reaction system can be 7-9, can be 7,7.5,8,8.5 or 9 in non-limiting manner.
In the described insulating and heat-conducting plastics of the present invention, the weight part of described modified graphene is 0.5-1.5 part, such as, can be 0.5 part, 1 part or 1.5 parts.
Wherein, described modified graphene obtains according to following preparation method, or says, the preparation method of described modified graphene is as follows:
Step S1, Graphene is added to the water so that it is concentration is 1-1.5mg/mL (namely adding 1-1.5mg graphene oxide in every 1mL water), stirs, obtains graphene solution;
Step S2, by the ethanol solution of tetraethyl orthosilicate, slowly it is added drop-wise in the graphene solution obtained in step S1, ultrasonic disperse 10-30 minute, then adds the ammonia soln that mass concentration is 15-25%, stirred at ambient temperature reaction 1-1.5 hour, centrifugation obtains solid; By this solid in turn with deionized water, absolute ethanol washing, then vacuum-drying, obtain modified graphene, also namely silica modified Graphene.
In described step S2, the mass ratio of Graphene and tetraethyl orthosilicate is 1:20-70, such as, can be 1:20,1:30,1:40,1:50,1:60 or 1:70.
In described step S2, NH contained by Graphene and ammonia soln3Mass ratio be 1:5-10, such as can be 1:5,1:6,1:7,1:8,1:9 or 1:10.
In the described insulating and heat-conducting plastics of the present invention, the weight part of described hollow glass micro-ball is 2-4 part, such as, can be 2 parts, 2.5 parts, 3 parts, 3.5 parts or 4 parts, and its diameter (i.e. granularity) is 10-20 ��m.
Hollow glass micro-ball is a kind of application inorganic raw material widely, sells source simple, and those skilled in the art obtain the hollow glass micro-ball of all size by business purchase, and this is no longer going to repeat them for its access approaches.
In the described insulating and heat-conducting plastics of the present invention, the weight part of described barium stearate is 2.5-5.5 part, such as, can be 2.5 parts, 3 parts, 3.5 parts, 4.5 parts, 5 parts or 5.5 parts.
In the described insulating and heat-conducting plastics of the present invention, the weight part of described distearyl oxygen sec.-propyl aluminic acid ester is 1-4 part, such as, can be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts or 4 parts.
In the described insulating and heat-conducting plastics of the present invention, the weight part of described stablizer is 1-3 part, such as, can be 1 part, 1.5 parts, 2 parts, 2.5 parts or 3 parts.
Wherein, described stablizer is selected from di-n-butyltin dilaurate, Sorbitol Powder, trisnonyl phenyl phosphite, two (2,2,6,6-tetramethyl--3-piperidines amino) any one in isophthaloyl amine, it is most preferred that it is two (2,2,6,6-tetramethyl--3-piperidines amino) isophthaloyl amine.
In the described insulating and heat-conducting plastics of the present invention, the weight part of described toughner is 2-5 part, such as, can be 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts.
Described toughner is any one in polyethers, polysulfones, polyimide, polyphenylene oxide ketone, polyethersulfone, polyvinyl alcohol, poly-acetic acid ethene, MBS terpolymer (MBS), chlorinatedpolyethylene, vinyl-vinyl acetate copolymer (EVA), it is most preferred that be vinyl-vinyl acetate copolymer (EVA).
2nd aspect, the present invention also relates to the preparation method of above-mentioned insulating and heat-conducting plastics, and described method comprises the steps:
Step a: take bisphenol A type epoxy resin, polyphthalamide and ABS resin that weight ratio is 1:1-3:2-4, then join in high-speed mixer and fully mix, obtain base-material;
Step b: add the barium stearate of 2.5-5.5 weight part, the distearyl oxygen sec.-propyl aluminic acid ester of 1-4 weight part, the stablizer of 1-3 weight part, the toughner of 2-5 weight part, the modified Nano alumina particle accounting for total consumption 40-60% in the base-material that step a obtains and account for the modified graphene of total consumption 70-80%, then fully mix in high-speed mixer, until evenly, obtain compound, and join and twin screw extruder carries out mixing shearing dispersion, temperature is 130-150 DEG C, obtains mixing masterbatch;
Step c: after the modified graphene of the mixing masterbatch, the modified Nano alumina particle of residual content and the residual content that are obtained by step b mixes 10-20 minute in static mixer, add the hollow glass micro-ball of 2-4 weight part again, after continuing to mix, extruding pelletization, obtains described insulating and heat-conducting plastics.
In the preparation method of the described insulating and heat-conducting plastics of the present invention, the implication of " accounting for the modified Nano alumina particle of total consumption 40-60% " in described step b refers in this step, adds the amount of the 40-60% of modified Nano alumina particle institute's requirement and 1-3 weight part. Same, " accounting for the modified graphene of total consumption 70-80% " also has same implication, namely adds the 70-80% that modification is model institute's requirement and 0.5-1.5 weight part.
And in described step c, add the modified Nano alumina particle of residual content and the modified graphene of residual content. So far, in step b and c, add altogether all modified Nano alumina particles and the modified graphene of institute's requirement.
The described insulating and heat-conducting plastics of the present invention and described preparation method, achieve following excellent effect:
1, adding and the selection of suitable amounts by modified Nano alumina particle and modified graphene, gained plastics are made to have excellent insulativity and thermal conductivity, and in the art, Graphene has good electroconductibility and naked, but by the modification of the inventive method, while there is thermal conductive resin, unexpectedly achieve excellent insulativity.
2, test data proves, the method for the present invention is added by the two-part of modified Nano alumina particle and modified graphene, optimizes insulativity and the thermal conductivity of gained plastics further, by process so, has best synergy.
3, compared with prior art, the insulating and heat-conducting plastics of the present invention is by the suitable selection of these components or combination, and unexpectedly achieve excellent synergy, there is excellent heat conduction, insulation function, meet the demand of the numerous areas such as electronic industry, power industry for such plastics, there is good prospects for commercial application and actual value.
Accompanying drawing explanation
Accompanying drawing 1 is the scanning electron microscope (SEM) photograph of the modified Nano alumina particle obtained by preparation example 1 of the present invention.
Embodiment
Below by specific embodiment, the present invention is described in detail; but the purposes of these exemplary enforcement modes and object are only used for enumerating the present invention; not the real protection scope of the present invention is formed any type of any restriction, more non-protection scope of the present invention is confined to this.
Preparation example 1: the preparation of modified Nano alumina particle
Step (1): by 1mol aluminum chloride (AlCl3) join in 400ml triethylene glycol, stir and evenly obtain reaction precursor liquid, then the NaOH aqueous solution that mass percentage concentration is 20% is joined (mol ratio making aluminum chloride and NaOH is 1:4) in this reaction precursor liquid, and at room temperature stir 1.5 hours, then with the temperature rise rate raised temperature to 200 DEG C of 40 DEG C/min and react 2.5 hours, naturally cooling is precipitated, and centrifugation obtains solid; The mixture of this solid acetoneand ethyl acetate, ethanol, deionized water are washed in turn, dry, obtain a nanometer Al2O3Particle;
Step (2): under ultrasound condition, nanometer Al obtained by step (1)2O3Granular composite, in dehydrated alcohol, adds ethanol solution (nanometer Al of positive isopropyl silicate wherein after being uniformly dispersed2O3The weight ratio of particle and positive isopropyl silicate is 1:2), then add ammonium bicarbonate aqueous solution so that the pH of reaction system is 8.0; By this reaction system at room temperature stirring reaction 2 hours, centrifugation obtains solid, by gained solid successively with acetone, dehydrated alcohol and deionized water wash, and vacuum-drying, obtain modified Nano alumina particle, namely silica modified nano alumina particles.
The scanning electron microscope (SEM) photograph of the modified Nano alumina particle obtained is shown in accompanying drawing 1, and as seen from the figure, gained grain diameter is even, and regular shape, granularity is about 7-9nm.
Preparation example 2: the preparation of modified graphene
Step S1, Graphene is added to the water so that it is concentration is 1-1.5mg/mL, stirs, and obtains graphene solution;
Step S2, by the ethanol solution of tetraethyl orthosilicate, slowly it is added drop-wise in the graphene solution obtained in step S1, the mass ratio making Graphene and tetraethyl orthosilicate is 1:40, then ultrasonic disperse 20 minutes, adding the ammonia soln that mass concentration is 20%, its amount should make Graphene and NH wherein3Mass ratio be 1:8. Stirred at ambient temperature reacts 1 hour, and centrifugation obtains solid; By this solid in turn with deionized water, absolute ethanol washing, then vacuum-drying, obtain modified graphene, also namely silica modified Graphene.
Embodiment 1
Step a: take bisphenol A type epoxy resin, polyphthalamide and ABS resin that weight ratio is 1:2:3, then join in high-speed mixer and fully mix, obtain base-material;
Step b: the barium stearate adding 2.5 weight parts in the base-material that step a obtains, the distearyl oxygen sec.-propyl aluminic acid ester of 1 weight part, the stablizer two (2 of 1 weight part, 2, 6, 6-tetramethyl--3-piperidines amino) isophthaloyl amine, the toughner EVA of 2 weight parts, the above-mentioned obtained modified Nano alumina particle of 0.4 weight part and the above-mentioned obtained modified graphene of 0.35 weight part, then fully mix in high-speed mixer, until evenly, obtain compound, and join and twin screw extruder carries out mixing shearing dispersion, temperature is 130 DEG C, obtain mixing masterbatch,
Step c: after the above-mentioned obtained modified graphene of the mixing masterbatch, the above-mentioned obtained modified Nano alumina particle of 0.6 weight part and 0.15 weight part that are obtained by step b mixes 10 minutes in static mixer, add the hollow glass micro-ball that 2 weight part granularities are 10 ��m again, after continuing to mix, extruding pelletization, obtain described insulating heat-conductive sample, called after SL-1.
Embodiment 2
Step a: take bisphenol A type epoxy resin, polyphthalamide and ABS resin that weight ratio is 1:2:3, then join in high-speed mixer and fully mix, obtain base-material;
Step b: the barium stearate adding 4 weight parts in the base-material that step a obtains, the distearyl oxygen sec.-propyl aluminic acid ester of 3 weight parts, the stablizer two (2 of 2 weight parts, 2, 6, 6-tetramethyl--3-piperidines amino) isophthaloyl amine, the toughner EVA of 3 weight parts, the above-mentioned obtained modified Nano alumina particle of 1 weight part and the above-mentioned obtained modified graphene of 0.7 weight part, then fully mix in high-speed mixer, until evenly, obtain compound, and join and twin screw extruder carries out mixing shearing dispersion, temperature is 140 DEG C, obtain mixing masterbatch,
Step c: after the above-mentioned obtained modified graphene of the mixing masterbatch, the above-mentioned obtained modified Nano alumina particle of 1 weight part and 0.3 weight part that are obtained by step b mixes 15 minutes in static mixer, add the hollow glass micro-ball that 3 weight part granularities are 15 ��m again, after continuing to mix, extruding pelletization, obtain described insulating heat-conductive sample, called after SL-2.
Embodiment 3
Step a: take bisphenol A type epoxy resin, polyphthalamide and ABS resin that weight ratio is 1:2:3, then join in high-speed mixer and fully mix, obtain base-material;
Step b: the barium stearate adding 5.5 weight parts in the base-material that step a obtains, the distearyl oxygen sec.-propyl aluminic acid ester of 4 weight parts, the stablizer two (2 of 3 weight parts, 2, 6, 6-tetramethyl--3-piperidines amino) isophthaloyl amine, the toughner EVA of 5 weight parts, the above-mentioned obtained modified Nano alumina particle of 1.8 weight parts and the above-mentioned obtained modified graphene of 1.2 weight parts, then fully mix in high-speed mixer, until evenly, obtain compound, and join and twin screw extruder carries out mixing shearing dispersion, temperature is 150 DEG C, obtain mixing masterbatch,
Step c: the above-mentioned obtained modified graphene of mixing masterbatch, the above-mentioned obtained modified Nano alumina particle of 1.2 weight parts and 0.3 weight part that step b is obtained, after static mixer mixes 20 minutes, add the hollow glass micro-ball that 4 weight part granularities are 20 ��m again, after continuing to mix, extruding pelletization, obtain described insulating heat-conductive sample, called after SL-3.
Comparative example 1-3
(nano alumina particles of identical weight part is namely only added) except modification except not carried out by aluminum oxide nanoparticle, comparative example 1-3 is implemented respectively with the same procedure with embodiment 1-3, namely comparative example 1 implemented according to the method for embodiment 1, implement comparative example 2 according to the method for embodiment 2 and implements comparative example 3 according to the method for embodiment 3 that (following comparative example has same corresponding relation, list no longer one by one below), obtain sample D1-D3 respectively.
Comparative example 4-6
Except Graphene not carried out implementing comparative example 4-6 respectively with the same procedure with embodiment 1-3, obtain sample D4-D6 respectively except modification (namely only adding the Graphene of identical weight part).
Comparative example 7-9
Except not adding above-mentioned obtained modified oxidized aluminum nanoparticles, implement comparative example 7-9 respectively with the same procedure with embodiment 1-3, obtain plastics D7-D9 respectively.
Comparative example 10-12
Except not adding above-mentioned obtained modified graphene, implement comparative example 10-12 respectively with the same procedure with embodiment 1-3, obtain sample D10-D12 respectively.
Comparative example 13-15
Except respectively in stepb disposable add required total amount modified oxidized aluminum nanoparticles and the disposable modified graphene adding required total amount except (in step c, namely not adding modified oxidized aluminum nanoparticles and modified graphene), implement comparative example 13-15 respectively with the same way with embodiment 1-3 respectively, obtain sample D13-D15 respectively.
Comparative example 16-18
Except respectively in step c disposable add required total amount modified oxidized aluminum nanoparticles and the disposable modified graphene adding required total amount except (namely not adding modified oxidized aluminum nanoparticles and modified graphene in stepb), implement comparative example 16-18 respectively with the same way with embodiment 1-3 respectively, obtain sample D16-D18 respectively.
Comparative example 19-21
Except not adding hollow glass micro-ball, implement comparative example 19-21 respectively with the same way with embodiment 1-3 respectively, obtain sample D19-D21 respectively.
Performance test
Sample injection moulding above-described embodiment and comparative example obtained respectively, obtains test plastic sample.
(1) mensuration of thermal conductivity
According to ASTME1461 standard, it may also be useful to the thermal conductivity of each plastic sample measured by Hot-diskTPS1500 thermal conductance survey meter.
(2) mensuration of volume specific resistance
With reference to IEC60093 standard, measure the volume specific resistance of each plastic sample.
(3) mensuration of tensile strength
According to GB1040 standard, it may also be useful to the tensile strength of each plastic sample measured by stretching strength measurement instrument.
The test result of all embodiments and comparative example is as shown in the table:
The tensile strength that note: " 180-187MPa " involved by * is D1-D9 is interval.
It thus is seen that when using the Graphene of the aluminum oxide nanoparticle of modification and modification simultaneously, it is possible to obtain excellent heat conduction and the synergy of insulation. And when any one does not carry out modification, then insulating property have and significantly reduce.
Can also finding out, the two-part of modified oxidized aluminum nanoparticles and modified graphene adds can significantly improve heat conduction and insulating property simultaneously. And all add fashionable when disposable, then cause heat conduction and insulating property to have and significantly reduce.
In addition, for tensile strength, it has been found that when not adding modified graphene, intensity has remarkable reduction, and this proves that the reticulated structure of Graphene can improve intensity significantly.
Summary, the present invention adopts described base-material, modified Nano aluminum oxide, modified graphene, hollow glass micro-ball, barium stearate, distearyl oxygen sec.-propyl aluminic acid ester, stablizer and toughner, and adopt specific two-part Adding Way and obtain the insulating and heat-conducting plastics of excellent performance, there is industrial applications prospect and marketable value very widely.
It is to be understood that the purposes of these embodiments only is not intended to for illustration of the present invention limit the scope of the invention. In addition; also should understand; after the technology contents having read the present invention, the present invention can be made various change, amendment and/or modification by those skilled in the art, and these all equivalent form of values fall within the protection domain that the application's appended claims limits equally.
Claims (6)
1. an insulating and heat-conducting plastics, described insulating and heat-conducting plastics comprises base-material, modified Nano alumina particle, modified graphene, hollow glass micro-ball, barium stearate, distearyl oxygen sec.-propyl aluminic acid ester, stablizer and toughner;
With parts by weight, its concrete component concentration is as follows:
Described base-material is the mixture of bisphenol A type epoxy resin, polyphthalamide and ABS resin, and wherein, the weight ratio of bisphenol A type epoxy resin, polyphthalamide and ABS resin is 1:1-3:2-4;
The preparation method of described modified Nano aluminum oxide is as follows:
Step (1): by aluminum chloride (AlCl3) or aluminum nitrate (Al (NO3)3) join in triethylene glycol, stir and evenly obtain reaction precursor liquid, then the NaOH aqueous solution is joined in this reaction precursor liquid, and at room temperature stir 1-2 hour, then to 180-220 DEG C and 2-3 hour is reacted with the temperature rise rate raised temperature of 40-50 DEG C/min, naturally cooling is precipitated, and centrifugation obtains solid; The mixture of this solid acetoneand ethyl acetate, ethanol, deionized water are washed in turn, dry, obtain a nanometer Al2O3Particle;
Step (2): under ultrasound condition, nanometer Al obtained by step (1)2O3Granular composite is in dehydrated alcohol, the ethanol solution of positive isopropyl silicate is added wherein after being uniformly dispersed, then ammonium bicarbonate aqueous solution is added, at room temperature stirring reaction 2-3 hour, centrifugation obtains solid, by gained solid successively with acetone, dehydrated alcohol and deionized water wash, and vacuum-drying, obtain modified Nano alumina particle, namely silica modified nano alumina particles;
The preparation method of described modified graphene is as follows:
Step S1, Graphene is added to the water so that it is concentration is 1-1.5mg/mL, stirs, and obtains graphene solution;
Step S2, by the ethanol solution of tetraethyl orthosilicate, slowly it is added drop-wise in the graphene solution obtained in step S1, ultrasonic disperse 10-30 minute, then adds the ammonia soln that mass concentration is 15-25%, stirred at ambient temperature reaction 1-1.5 hour, centrifugation obtains solid; By this solid in turn with deionized water, absolute ethanol washing, then vacuum-drying, obtain modified graphene.
2. insulating and heat-conducting plastics as claimed in claim 1, it is characterised in that: in described step (1), AlCl3With NaOH or Al (NO3)3It is 1:3-5 with the mol ratio of NaOH.
3. insulating and heat-conducting plastics as claimed in claim 1, it is characterised in that: in described step (2), nanometer Al of step (1)2O3The weight ratio of particle and positive isopropyl silicate is 1:1-3.
4. insulating and heat-conducting plastics as claimed in claim 1, it is characterised in that: in described step S2, the mass ratio of Graphene and tetraethyl orthosilicate is 1:20-70.
5. insulating and heat-conducting plastics as claimed in claim 1, it is characterised in that: in described step S2, NH contained by Graphene and ammonia soln3Mass ratio be 1:5-10.
6. the preparation method of the described insulating and heat-conducting plastics of the arbitrary item of claim 1-5, described method comprises the steps:
Step a: take bisphenol A type epoxy resin, polyphthalamide and ABS resin that weight ratio is 1:1-3:2-4, then join in high-speed mixer and fully mix, obtain base-material;
Step b: add the barium stearate of 2.5-5.5 weight part, the distearyl oxygen sec.-propyl aluminic acid ester of 1-4 weight part, the stablizer of 1-3 weight part, the toughner of 2-5 weight part, the modified Nano alumina particle accounting for total consumption 40-60% in the base-material that step a obtains and account for the modified graphene of total consumption 70-80%, then fully mix in high-speed mixer, until evenly, obtain compound, and join and twin screw extruder carries out mixing shearing dispersion, temperature is 130-150 DEG C, obtains mixing masterbatch;
Step c: after the modified graphene of the mixing masterbatch, the modified Nano alumina particle of residual content and the residual content that are obtained by step b mixes 10-20 minute in static mixer, add the hollow glass micro-ball of 2-4 weight part again, after continuing to mix, extruding pelletization, obtains described insulating and heat-conducting plastics.
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