CN109401251A - A kind of polylactic acid heat-conductive composite material and preparation method thereof - Google Patents
A kind of polylactic acid heat-conductive composite material and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to polymeric material fields more particularly to a kind of polylactic acid heat-conductive composite material and preparation method thereof.Polylactic acid heat-conductive composite material provided by the invention is by including that the raw material melt blending of following parts by weight of component is made: 100 parts of Poly L-lactic acid；5~25 parts of poly- L-lactic acid；20~50 parts of heat filling；The heat filling includes at least three kinds in boron nitride, aluminium oxide, silicon carbide, aluminium nitride, aluminium vanadine, silicon powder and alusil alloy powder；The temperature of the melt blending is higher than the fusing point of Poly L-lactic acid and poly- L-lactic acid, lower than the fusing point of Stereocomplex type polylactic acid.The experimental results showed that polylactic acid heat-conductive composite material provided by the invention has good heating conduction and crystal property, thermal coefficient is lower than 1.6min in 1.0W/mK or more, (Tc=100 DEG C) of crystallization half-life.
Description
Technical field
The invention belongs to polymeric material fields more particularly to a kind of polylactic acid heat-conductive composite material and preparation method thereof.
Background technique
Polylactic acid (PLA) is further polymerize by that can become lactic acid with the amylofermentation that regenerated plant resources extract
Made of aliphatic polyester, be that more active one of kind is studied in aliphatic polyester.Polylactic acid glass transition temperature and
Fusing point is respectively 60 DEG C and 175 DEG C or so, is a kind of hard macromolecule in glassy state, hot property and polyphenyl at room temperature
Ethylene is similar.Polylactic acid has thermoplasticity, can be as the synthesis macromolecule such as PP, PS and PET on general process equipment
Carry out processing and forming.
Poly-lactic acid material belongs to Biodegradable material, buries after use in the soil, will by certain time
Natural decomposition is water and carbon dioxide, not will cause environmental pollution.Therefore, along with currently increasingly severeer Environmental Protection Situation,
Poly-lactic acid material starts the favor increasingly by market.
Since the heating conduction of poly-lactic acid material itself is poor, its application field is caused to be greatly limited.Therefore, in order to
The application field of poly-lactic acid material is expanded, heat filling can be blended and be doped in polylactic acid, promote the thermally conductive of poly-lactic acid material
Performance.But the heating conduction for the lactic acid composite material being prepared at present using aforesaid way is also unsatisfactory, simultaneously
There is also the problems that crystal property is poor.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of polylactic acid heat-conductive composite material and preparation method thereof, this hair
The polylactic acid heat-conductive composite material of bright offer has good heating conduction and crystal property.
The present invention provides a kind of polylactic acid heat-conductive composite materials, by the raw material melt blending including following parts by weight of component
It is made:
100 parts of Poly L-lactic acid；
5~25 parts of poly- L-lactic acid；
20~50 parts of heat filling；
The heat filling includes boron nitride, aluminium oxide, silicon carbide, aluminium nitride, aluminium vanadine, silicon powder and alusil alloy powder
In at least three kinds；
The temperature of the melt blending is higher than the fusing point of Poly L-lactic acid and poly- L-lactic acid, lower than the poly- cream of Stereocomplex type
The fusing point of acid.
Preferably, the partial size of the heat filling is 20~200 nanometers.
Preferably, the heat filling includes boron nitride, aluminium oxide and alusil alloy powder.
Preferably, the heat filling includes aluminium nitride, silicon powder and boron nitride.
Preferably, the heat filling includes aluminium vanadine, silicon powder and alusil alloy powder.
Preferably, the heat filling includes aluminium nitride, aluminium oxide and boron nitride.
Preferably, the weight average molecular weight of the Poly L-lactic acid is 1~200,000；The weight average molecular weight of the poly- L-lactic acid
It is 1~200,000.
The present invention provides a kind of preparation method of polylactic acid heat-conductive composite material described in above-mentioned technical proposal, including it is following
Step:
A) by Poly L-lactic acid, poly- L-lactic acid and heat filling melt blending, polylactic acid heat-conductive composite material is obtained；
The temperature of the melt blending is higher than the fusing point of Poly L-lactic acid and poly- L-lactic acid, lower than the poly- cream of Stereocomplex type
The fusing point of acid.
Preferably, the temperature of the melt blending is 160~180 DEG C.
Preferably, the time of the melt blending is 5~15min.
Compared with prior art, the present invention provides a kind of polylactic acid heat-conductive composite materials and preparation method thereof.The present invention
The polylactic acid heat-conductive composite material of offer is by including that the raw material melt blending of following parts by weight of component is made: Poly L-lactic acid 100
Part；5~25 parts of poly- L-lactic acid；20~50 parts of heat filling；The heat filling includes boron nitride, aluminium oxide, silicon carbide, nitrogen
Change at least three kinds in aluminium, aluminium vanadine, silicon powder and alusil alloy powder；The temperature of the melt blending be higher than Poly L-lactic acid and
The fusing point of poly- L-lactic acid, lower than the fusing point of Stereocomplex type polylactic acid.Scheme provided by the invention is processed using watery fusion
Polylactic acid heat-conductive composite material is prepared, in such processing temperature section, Poly L-lactic acid and poly- L-lactic acid can be complete
Melting, only Stereocomplex type polylactic acid crystal can be grown, once being formed Stereocomplex type polylactic acid crystal, will be with solid phase
Form be dispersed in polylactic resin, the Stereocomplex type polylactic acid crystal being formed in situ and be added in polylactic resin
Specific heat filling collision, is dispersed in these heat fillings in polylactic resin, not only forms effective thermally conductive logical
Road improves the heating conduction of composite material, has also speeded up Poly L-lactic acid crystallization, improves the crystal property of composite material.
The experimental results showed that the thermal coefficient of polylactic acid heat-conductive composite material provided by the invention is in 1.0W/mK or more, crystallization half-life
(Tc=100 DEG C) is lower than 1.6min.
Specific embodiment
The following is a clear and complete description of the technical scheme in the embodiments of the invention, it is clear that described embodiment
Only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
Art personnel every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
The present invention provides a kind of polylactic acid heat-conductive composite materials, by the raw material melt blending including following parts by weight of component
It is made:
100 parts of Poly L-lactic acid；
5~25 parts of poly- L-lactic acid；
0.5~15 part of heat filling；
The heat filling includes boron nitride, aluminium oxide, silicon carbide, aluminium nitride, aluminium vanadine, silicon powder and alusil alloy powder
In at least three kinds；
The temperature of the melt blending is higher than the fusing point of Poly L-lactic acid and poly- L-lactic acid, lower than the poly- cream of Stereocomplex type
The fusing point of acid.
Polylactic acid heat-conductive composite material provided by the invention is made of raw material melt blending, wherein the raw material includes poly-
D-lactic acid, poly- L-lactic acid and heat filling.In the present invention, the weight average molecular weight of the Poly L-lactic acid be preferably 1~
200000, concretely 10,000,20,000,30,000,40,000,50,000,60,000,70,000,80,000,90,000,100,000,110,000,120,000,130,000,140,000,15
Ten thousand, 160,000,170,000,180,000,190,000 or 200,000.
In the present invention, the weight average molecular weight of the poly- L-lactic acid is preferably 1~200,000, and concretely 10,000,20,000,3
Ten thousand, 40,000,50,000,60,000,70,000,80,000,90,000,100,000,110,000,120,000,130,000,140,000,150,000,160,000,170,000,180,000,190,000
Or 200,000.It in the present invention, is in terms of 100 parts by weight by the content of Poly L-lactic acid in the feed, the poly- L-lactic acid is in original
Content in material is 5~25 parts by weight, concretely 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 weights
Measure part, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight,
19 parts by weight, 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight or 25 parts by weight.
In the present invention, the heat filling includes boron nitride, aluminium oxide, silicon carbide, aluminium nitride, aluminium vanadine, silicon powder
With at least three kinds in alusil alloy powder, preferably three kinds；The partial size of the heat filling is preferably 20~200 nanometers, specifically
Can for 20 nanometers, 30 nanometers, 40 nanometers, 50 nanometers, 60 nanometers, 70 nanometers, 80 nanometers, 90 nanometers, 100 nanometers, 110 nanometers,
120 nanometers, 130 nanometers, 140 nanometers, 150 nanometers, 160 nanometers, 170 nanometers, 180 nanometers, 190 nanometers or 200 nanometers；It is described
The silica alumina ratio of aluminium vanadine is preferably 4~12, and concretely 4,5,6,7,8,9,10,11 or 12；The sial of the alusil alloy powder
Than being preferably 1~8, concretely 1,2,3,4,5,6,7 or 8.In one embodiment provided by the invention, the heat filling
Including boron nitride, aluminium oxide and alusil alloy powder, the mass ratio of the boron nitride, aluminium oxide and alusil alloy powder is preferably 5:(3
~15): (5~20), more preferably 5:(5~10): (8~15), most preferably 5:8:10.In another reality provided by the invention
Apply in example, the heat filling includes aluminium nitride, silicon powder and boron nitride, the heat filling include aluminium nitride, silicon powder and
The mass ratio of boron nitride is preferably 7:(3~15): (2~12), more preferably 7:(5~10): (4~8), most preferably 7:7:6.
In other embodiments provided by the invention, the heat filling includes aluminium vanadine, silicon powder and alusil alloy powder, the aluminium vanadium
The mass ratio of soil, silicon powder and alusil alloy powder is preferably 8:(3~15): (1~10), more preferably 8:(5~10): (3~
7), most preferably 8:7:5.In other embodiments provided by the invention, the heat filling includes aluminium nitride, aluminium oxide and nitrogen
Change boron, the mass ratio of the aluminium nitride, aluminium oxide and boron nitride is preferably 11:(0.5~5): (5~20), more preferably 11:(1
~3): (8~15), most preferably 11:2:12.
It in the present invention, is in terms of 100 parts by weight by the content of Poly L-lactic acid in the feed, the heat filling is in raw material
In content be 20~50 parts by weight, concretely 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight,
25 parts by weight, 26 parts by weight, 27 parts by weight, 28 parts by weight, 29 parts by weight, 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 weights
Measure part, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight, 40 parts by weight, 41 parts by weight,
42 parts by weight, 43 parts by weight, 44 parts by weight, 45 parts by weight, 46 parts by weight, 47 parts by weight, 48 parts by weight, 49 parts by weight or 50 weights
Measure part.
In the present invention, the temperature of the melt blending is higher than the fusing point of Poly L-lactic acid and poly- L-lactic acid, lower than vertical
The fusing point of the compound polylactic acid of structure, preferably 160~180 DEG C, concretely 160 DEG C, 165 DEG C, 170 DEG C, 175 DEG C or 180 DEG C.
The present invention also provides a kind of preparation methods of polylactic acid heat-conductive composite material described in above-mentioned technical proposal, including with
Lower step:
A) by Poly L-lactic acid, poly- L-lactic acid and heat filling melt blending, polylactic acid heat-conductive composite material is obtained；
The temperature of the melt blending is higher than the fusing point of Poly L-lactic acid and poly- L-lactic acid, lower than the poly- cream of Stereocomplex type
The fusing point of acid.
In preparation method provided by the invention, first in proportion by Poly L-lactic acid, poly- L-lactic acid and heat filling
Melt blending.Wherein, the Poly L-lactic acid, poly- L-lactic acid and heat filling are advanced preferably before carrying out melting mixing
Row drying；The temperature of the drying is preferably 70~120 DEG C, be specifically as follows 70 DEG C, 75 DEG C, 80 DEG C, 85 DEG C, 90 DEG C, 95 DEG C,
100 DEG C, 105 DEG C, 110 DEG C, 115 DEG C or 120 DEG C；The time of the drying is preferably 3~6h, concretely 3h, 4h, 5h or
6h.In the present invention, the temperature of the melt blending is higher than the fusing point of Poly L-lactic acid and poly- L-lactic acid, is lower than Stereocomplex
The fusing point of type polylactic acid, preferably 160~180 DEG C, concretely 160 DEG C, 165 DEG C, 170 DEG C, 175 DEG C or 180 DEG C；It is described molten
To melt blending preferably to carry out under agitation, the rate of the stirring is preferably 60~100 revs/min, concretely 60 revs/min,
70 revs/min, 80 revs/min, 90 revs/min or 100 revs/min；The time of the melt blending is preferably 5~15min, concretely
5min, 6min, 7min, 8min, 9min, 10min, 11min, 12min, 13min, 14min or 15min.After melt blending,
Blend melt is cooled down, and polylactic acid heat-conductive composite material provided by the invention is obtained.
Scheme provided by the invention is using watery fusion processing preparation polylactic acid heat-conductive composite material, in such processing temperature
Section is spent, Poly L-lactic acid and poly- L-lactic acid can melt completely, and only Stereocomplex type polylactic acid crystal can be grown,
Stereocomplex type polylactic acid crystal once being formed will be dispersed in polylactic resin in the form of solid phase, and what is be formed in situ is vertical
The compound polylactic acid crystal of structure is collided with the specific heat filling being added in polylactic resin, divides these heat fillings uniformly
It dissipates in polylactic resin, not only forms effective thermal conducting path, improve the heating conduction of composite material, also speeded up poly-
D-lactic acid crystallization, improves the crystal property of composite material.The experimental results showed that polylactic acid provided by the invention is thermally conductive compound
For the thermal coefficient of material in 1.0W/mK or more, (Tc=100 DEG C) of crystallization half-life is lower than 1.6min.
For the sake of becoming apparent from, it is described in detail below by following embodiment.
The raw material (Poly L-lactic acid, poly- L-lactic acid, heat filling) used in the following embodiment and comparative examples of the present invention
Before carrying out melting mixing, it is firstly placed in 80 DEG C of vacuum oven and is dried, dry 3h.
In the following embodiment and comparative examples of the present invention, the heating conduction of composite material uses heat-pole method Determination of conductive coefficients
Instrument is tested, and test temperature is room temperature, and each sample takes its average value leading as the composite material at indoor temperature measurement five times
Hot coefficient, the size of test sample are 40 × 10 × 1mm3。
In the following embodiment and comparative examples of the present invention, the crystal property of composite material is measured in accordance with the following methods:
The composite material being prepared is taken, fritter is cut into as sample to be tested and carries out isothermal crystal measurement, specific continuous mode are as follows: is first
Under nitrogen protection by sample to be tested first, 190 DEG C are raised to from room temperature with 50 DEG C/min, stop 2min and eliminate thermal history, then with
10 DEG C/min is cooled to 0 DEG C, later by 10 DEG C/min of sample be warming up to 190 DEG C melting 2 minutes to ensure complete amorphous state,
Required crystallization temperature (Tc) is finally quickly cooled to 45 DEG C/min of cooling rate, crystallization half-life t can be obtained by test1/2。
Embodiment 1
Weigh 100 parts by weight of polylactic acid that weight average molecular weight is 100,000, boron nitride (20 nanometers of partial size) 5 parts by weight, oxidation
Aluminium (30 nanometers of partial size) 8 parts by weight, alusil alloy powder (alumina silica ratio 6,80 nanometers of partial size) 10 parts by weight, weight average molecular weight are 100,000
20 parts by weight of poly- L-lactic acid；Above-mentioned raw materials are mixed into 10min under conditions of 180 DEG C, 80 revs/min, it is cooling after blending
To room temperature, polylactic acid heat-conductive composite material is obtained.
Heating conduction and crystal property measurement to above-mentioned polylactic acid heat-conductive composite material, as a result are as follows: thermal coefficient
1.43W/mK, crystallization half-life (Tc=100 DEG C) 0.9min.
Embodiment 2
Weigh 100 parts by weight of polylactic acid that weight average molecular weight is 50,000, aluminium nitride (50 nanometers of partial size) 7 parts by weight, silicon powder
(20 nanometers of partial size) 7 parts by weight, boron nitride (150 nanometers of partial size) 6 parts by weight, the poly- L-lactic acid 15 that weight average molecular weight is 50,000
Parts by weight；Above-mentioned raw materials are mixed into 10min under conditions of 180 DEG C, 80 revs/min, are cooled to room temperature after blending, poly- cream is obtained
Sour heat-conductive composite material.
Heating conduction and crystal property measurement to above-mentioned polylactic acid heat-conductive composite material, as a result are as follows: thermal coefficient
1.23W/mK, crystallization half-life (Tc=100 DEG C) 1.2min.
Embodiment 3
Weigh 100 parts by weight of polylactic acid that weight average molecular weight is 150,000, aluminium vanadine (alumina silica ratio 9,200 nanometers of partial size) 8 weights
Part, silicon powder (100 nanometers of partial size) 7 parts by weight, alusil alloy powder (alumina silica ratio 5,50 nanometers of partial size) 5 parts by weight are measured, is divided equally again
25 parts by weight of poly- L-lactic acid that son amount is 150,000；Above-mentioned raw materials are mixed into 5min under conditions of 170 DEG C, 80 revs/min, altogether
It is cooled to room temperature after mixed, obtains polylactic acid heat-conductive composite material.
Heating conduction and crystal property measurement to above-mentioned polylactic acid heat-conductive composite material, as a result are as follows: thermal coefficient
1.59W/mK, crystallization half-life (Tc=100 DEG C) 0.9min.
Embodiment 4
Weigh 100 parts by weight of polylactic acid that weight average molecular weight is 200,000, aluminium nitride (100 nanometers of partial size) 11 parts by weight, oxygen
Change aluminium (80 nanometers of partial size) 2 parts by weight, boron nitride (50 nanometers of partial size) 12 parts by weight, the poly- dextrorotation cream that weight average molecular weight is 50,000
Sour 5 parts by weight；Above-mentioned raw materials are mixed into 5min under conditions of 170 DEG C, 80 revs/min, is cooled to room temperature, is gathered after blending
Lactic acid heat-conductive composite material.
Heating conduction and crystal property measurement to above-mentioned polylactic acid heat-conductive composite material, as a result are as follows: thermal coefficient
1.01W/mK, crystallization half-life (Tc=100 DEG C) 1.6min.
Comparative example 1
Weigh 100 parts by weight of Poly L-lactic acid that weight average molecular weight is 100,000, boron nitride (150 nanometers of partial size) 50 weight
Part；Above-mentioned raw materials are mixed into 15min under conditions of 180 DEG C, 80 revs/min, is cooled to room temperature after blending, is obtained polylactic acid and lead
Hot composite material.
Heating conduction and crystal property measurement to above-mentioned polylactic acid heat-conductive composite material, as a result are as follows: thermal coefficient
0.21W/mK, crystallization half-life (Tc=100 DEG C) it is lower than 11.2min
Comparative example 2
Weigh 100 parts by weight of polylactic acid that weight average molecular weight is 100,000, boron nitride (100 nanometers of partial size) 20 parts by weight, oxygen
Change aluminium (150 nanometers of partial size) 30 parts by weight；Above-mentioned raw materials are mixed into 10min under conditions of 180 DEG C, 80 revs/min, after blending
It is cooled to room temperature, obtains polylactic acid heat-conductive composite material.
Heating conduction and crystal property measurement to above-mentioned polylactic acid heat-conductive composite material, as a result are as follows: thermal coefficient
0.19W/mK, crystallization half-life (Tc=100 DEG C) 12.1min.
Comparative example 3
Weigh 100 parts by weight of polylactic acid that weight average molecular weight is 100,000, aluminium vanadine (alumina silica ratio 4,200 nanometers of partial size) 20 weights
Measure part, silicon carbide (80 nanometers of partial size) 20 parts by weight；Above-mentioned raw materials are mixed into 5min under conditions of 180 DEG C, 80 revs/min,
It is cooled to room temperature after blending, obtains polylactic acid heat-conductive composite material.
Heating conduction and crystal property measurement to above-mentioned polylactic acid heat-conductive composite material, as a result are as follows: thermal coefficient
0.17W/mK.Crystallization half-life (Tc=100 DEG C) 13.8min.
Comparative example 4
Weigh 100 parts by weight of polylactic acid that weight average molecular weight is 150,000, aluminium vanadine (alumina silica ratio 9,200 nanometers of partial size) 22 weights
Measure part, 25 parts by weight of poly- L-lactic acid that weight average molecular weight is 150,000；By above-mentioned raw materials under conditions of 170 DEG C, 80 revs/min
5min is mixed, is cooled to room temperature after blending, obtains polylactic acid heat-conductive composite material.
Heating conduction and crystal property measurement to above-mentioned polylactic acid heat-conductive composite material, as a result are as follows: thermal coefficient
1.04W/mK, crystallization half-life (Tc=100 DEG C) 3.1min.
Comparative example 5
Weigh 100 parts by weight of polylactic acid that weight average molecular weight is 150,000, silicon powder (100 nanometers of partial size) 22 parts by weight, weight
25 parts by weight of poly- L-lactic acid that average molecular weight is 150,000；Above-mentioned raw materials are mixed under conditions of 170 DEG C, 80 revs/min
5min is cooled to room temperature after blending, obtains polylactic acid heat-conductive composite material.
Heating conduction and crystal property measurement to above-mentioned polylactic acid heat-conductive composite material, as a result are as follows: thermal coefficient
0.99W/mK, crystallization half-life (Tc=100 DEG C) 2.7min.
Comparative example 6
Weigh 100 parts by weight of polylactic acid that weight average molecular weight is 150,000, alusil alloy powder (alumina silica ratio 5,50 nanometers of partial size)
22 parts by weight, 25 parts by weight of poly- L-lactic acid that weight average molecular weight is 150,000；By above-mentioned raw materials in 170 DEG C, 80 revs/min of item
5min is mixed under part, is cooled to room temperature after blending, and polylactic acid heat-conductive composite material is obtained.
Heating conduction and crystal property measurement to above-mentioned polylactic acid heat-conductive composite material, as a result are as follows: thermal coefficient
1.14W/mK, crystallization half-life (Tc=100 DEG C) 1.9min.
Comparative example 7
Weigh 100 parts by weight of polylactic acid that weight average molecular weight is 200,000, aluminium nitride (100 nanometers of partial size) 27 parts by weight, weight
5 parts by weight of poly- L-lactic acid that average molecular weight is 50,000；Above-mentioned raw materials are mixed into 5min under conditions of 170 DEG C, 80 revs/min,
It is cooled to room temperature after blending, obtains polylactic acid heat-conductive composite material.
Heating conduction and crystal property measurement to above-mentioned polylactic acid heat-conductive composite material, as a result are as follows: thermal coefficient
0.97W/mK, crystallization half-life (Tc=100 DEG C) 2.1min.
Comparative example 8
100 parts by weight of polylactic acid that weight average molecular weight is 200,000 are weighed, aluminium oxide (80 nanometers of partial size) 27 parts by weight, weight is
5 parts by weight of poly- L-lactic acid that molecular weight is 50,000；Above-mentioned raw materials are mixed into 5min under conditions of 170 DEG C, 80 revs/min, altogether
It is cooled to room temperature after mixed, obtains polylactic acid heat-conductive composite material.
Heating conduction and crystal property measurement to above-mentioned polylactic acid heat-conductive composite material, as a result are as follows:: thermal coefficient
0.81W/mK, crystallization half-life (Tc=100 DEG C) 3.2min.
Comparative example 9
100 parts by weight of polylactic acid that weight average molecular weight is 200,000 are weighed, boron nitride (50 nanometers of partial size) 27 parts by weight, weight is
5 parts by weight of poly- L-lactic acid that molecular weight is 50,000；Above-mentioned raw materials are mixed into 5min under conditions of 170 DEG C, 80 revs/min, altogether
It is cooled to room temperature after mixed, obtains polylactic acid heat-conductive composite material.
Heating conduction and crystal property measurement to above-mentioned polylactic acid heat-conductive composite material, as a result are as follows:: thermal coefficient
0.77W/mK, crystallization half-life (Tc=100 DEG C) 4.3min.
Comparative example 10
Weigh 100 parts by weight of polylactic acid that weight average molecular weight is 200,000, aluminium nitride (100 nanometers of partial size) 11 parts by weight, oxygen
Change aluminium (80 nanometers of partial size) 2 parts by weight, boron nitride (50 nanometers of partial size) 12 parts by weight, the poly- dextrorotation cream that weight average molecular weight is 50,000
Sour 5 parts by weight；Above-mentioned raw materials are mixed into 5min under conditions of 200 DEG C, 80 revs/min, is cooled to room temperature, is gathered after blending
Lactic acid heat-conductive composite material.
Heating conduction and crystal property measurement to above-mentioned polylactic acid heat-conductive composite material, as a result are as follows: thermal coefficient
1.00W/mK, crystallization half-life (Tc=100 DEG C) 10min.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of polylactic acid heat-conductive composite material is made of the raw material melt blending for including following parts by weight of component:
100 parts of Poly L-lactic acid；
5~25 parts of poly- L-lactic acid；
20~50 parts of heat filling；
The heat filling includes in boron nitride, aluminium oxide, silicon carbide, aluminium nitride, aluminium vanadine, silicon powder and alusil alloy powder
At least three kinds；
The temperature of the melt blending is higher than the fusing point of Poly L-lactic acid and poly- L-lactic acid, lower than Stereocomplex type polylactic acid
Fusing point.
2. composite material according to claim 1, which is characterized in that the partial size of the heat filling is 20~200 nanometers.
3. composite material according to claim 1, which is characterized in that the heat filling include boron nitride, aluminium oxide and
Alusil alloy powder.
4. composite material according to claim 1, which is characterized in that the heat filling include aluminium nitride, silicon powder and
Boron nitride.
5. composite material according to claim 1, which is characterized in that the heat filling include aluminium vanadine, silicon powder and
Alusil alloy powder.
6. composite material according to claim 1, which is characterized in that the heat filling include aluminium nitride, aluminium oxide and
Boron nitride.
7. composite material according to claim 1, which is characterized in that the weight average molecular weight of the Poly L-lactic acid be 1~
200000；The weight average molecular weight of the poly- L-lactic acid is 1~200,000.
8. a kind of preparation method of any one of claim 1~7 polylactic acid heat-conductive composite material, comprising the following steps:
A) by Poly L-lactic acid, poly- L-lactic acid and heat filling melt blending, polylactic acid heat-conductive composite material is obtained；
The temperature of the melt blending is higher than the fusing point of Poly L-lactic acid and poly- L-lactic acid, lower than Stereocomplex type polylactic acid
Fusing point.
9. preparation method according to claim 8, which is characterized in that the temperature of the melt blending is 160~180 DEG C.
10. preparation method according to claim 9, which is characterized in that the time of the melt blending is 5~15min.
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