CN107759990A - A kind of full biological poly lactic acid composite and preparation method thereof - Google Patents
A kind of full biological poly lactic acid composite and preparation method thereof Download PDFInfo
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- CN107759990A CN107759990A CN201711058047.3A CN201711058047A CN107759990A CN 107759990 A CN107759990 A CN 107759990A CN 201711058047 A CN201711058047 A CN 201711058047A CN 107759990 A CN107759990 A CN 107759990A
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/02—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polycarbonates or saturated polyesters
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
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Abstract
The invention discloses a kind of full biological poly lactic acid composite and preparation method thereof, the composite is made up of the raw material of following percentage by weight：PLA 55~89%, filler 10~40%, itaconic anhydride grafted polylactic acid 1~5%.The preparation method of full biological poly lactic acid composite includes：PLA, filler are added in mixer, drying process, and are well mixed；Then itaconic anhydride grafted polylactic acid copolymer is added, and is well mixed；Again, using double screw extruder melting extrusion, tie rod, air-cooled, granulation, full biological poly lactic acid composite is obtained.The present invention uses interface coupling agent of the itaconic anhydride grafted polylactic acid copolymer as composite, greatly enhances the adhesion of interface, can significantly improve the mechanical property of composite.
Description
Technical field
The present invention relates to lactic acid composite material technical field, and in particular to a kind of full biological poly lactic acid composite and
Its preparation method.
Background technology
Growing with high polymer material, the problem of it brings, also increasingly shows, and maximum of which problem is that it can
Continuation and caused environmental destruction.High polymer material is mainly derived from non-renewable fossil resources at present, high
Molecular material will face the huge challenge of sustainable development.In addition, most petroleum base high polymer materials belong to non-degradable
Material, bring " white pollution " of sternness, and heavy damage land ecological environment and the marine eco-environment.Polymeric scrap material
Heap buried processing, have a strong impact on soil permeability, destroy soil property, make plant and crops be difficult to grow.Also, waste high polymer
Burning disposal, be further exacerbated by " greenhouse gases " discharge, " haze " weather and " acid rain " weather.As people protect for environment
The consciousness of shield increasingly strengthens, and development environment friendly bio-based degradable high polymer material is also increasingly taken seriously.
PLA (PLA) be that current whole world production capacity is maximum, combination property is optimal and can close to the plastics of polystyrene,
Price is minimum relative to other biological plastics (such as PBS, PBAT, PHA), and can fully achieve a kind of biodegradable bio-based modeling
Material.But relative to the petroleum base general-purpose plastics such as PP and PS, PLA price is still higher, greatly limits PLA
Large-scale application.In recent years, in order to reduce the production cost of PLA and keep its biodegradable, using it is cheap, come
Source is extensive, the biodegradable and reproducible living resources such as filled composite PLA such as lignocellulose, bamboo powder and starch
Have become a direction with the fastest developing speed in environmentally-friendly plastic.However, directly PLA is filled using biomass filler
Modification will further increase PLA (PLA) fragility of itself, and fracture tensile strength, the impact for reducing PLA (PLA) are strong
Degree and tensile toughness.This mainly due to surface hydrophilic biomass filler and surface hydrophobicity PLA interface compatibility
Difference, cause the interface adhesion of the two poor.Therefore, the interface compatibility of biomass filler and PLA is only improved, could be thorough
Bottom improves the mechanical property of polylactic acid-base composite material, reaches and meets practical application request.
At this stage, people are mainly by adding plasticizer (polyethylene glycol, citrate and its derivative, lactic acid and its low
Polymers etc.), interfacial reaction coupling agent (diisocyanates MDI, TDI etc.), maleic anhydride grafted polylactic acid and methacrylic acid
Ethylene oxidic ester grafted polylactic acid etc. improves the mechanical performance of polylactic acid-base composite material.However, plasticizer causes PLA
Intensity and modulus reduces, and deposits the risk separated out after long times；Interfacial reaction coupling agent general toxicity is larger, is not suitable for very
To the field for forbidding contacting with food applied to disposable tableware and packaging for foodstuff etc.；Maleic anhydride grafted polylactic acid is typically grafted
Rate is relatively low, causes coupling effect relatively low；The epoxide group reactivity of glycidyl methacrylate graft PLA is relatively low,
Its application field is caused to be restricted.
The content of the invention
In order to overcome problems of the prior art, the invention provides a kind of full biological poly lactic acid composite and
Its preparation method, using interface coupling agent of the itaconic anhydride grafted polylactic acid copolymer as composite, greatly enhance interface
The adhesion at place, the mechanical property of composite can be significantly improved.
A kind of full biological poly lactic acid composite, is made up of the raw material of following percentage by weight：
PLA 55%~89%；
Filler 10%~40%；
Itaconic anhydride grafted polylactic acid 1%~5%；
Described PLA is one or more kinds of combinations in L-type PLA, D types PLA and LD mixed type PLAs；
Described filler include the biomass filler such as cornstarch, bamboo powder, cellulose, flaxen fiber and talcum powder, calcium carbonate,
More than one or both of inorganic fillers such as montmorillonite (including two kinds).I.e. described filler is cornstarch, bamboo powder, fiber
More than one or both of element, flaxen fiber, talcum powder, calcium carbonate, montmorillonite (including two kinds).
Further preferably, described full biological poly lactic acid composite, is made up of the raw material of following percentage by weight：
PLA 55%~79%；
Filler 15%~40%；
Itaconic anhydride grafted polylactic acid 1%~5%.
Still more preferably, described full biological poly lactic acid composite, is made up of the raw material of following percentage by weight：
Described biomass filler be cornstarch, bamboo powder, cellulose, it is more than one or both of flaxen fiber (including
Two kinds).
Described inorganic filler is more than one or both of talcum powder, calcium carbonate, montmorillonite (including two kinds).
A kind of itaconic anhydride grafted polylactic acid copolymer, by melt free radical grafting reaction itaconic anhydride is grafted to it is poly-
On the strand of lactic acid, it is made up of the raw material of following percentage by weight：
PLA 90%~99%；
Itaconic anhydride 0.5%~8%；
Initiator 0.1%~5%.
Preferably, described itaconic anhydride grafted polylactic acid copolymer, is made up of the raw material of following percentage by weight：
PLA 93%~99%；
Itaconic anhydride 0.7%~6%；
Initiator 0.3%~3%.
Further preferably, described itaconic anhydride grafted polylactic acid copolymer, by melting free radical grafting reaction by clothing
Health acid anhydrides is grafted on the strand of PLA, is made up of the raw material of following percentage by weight：
PLA 93.5%~98.7%；
Itaconic anhydride 1%~5%；
Initiator 0.3%~1.5%.
Described PLA is L-type PLA, D types PLA, it is one or more kinds of in LD mixed type PLAs (including
Two kinds)；
Described itaconic anhydride derives from citric acid, has recyclability, its purity >=99%；
Described initiator is organic peroxide, and mainly including cumyl peroxide, double (2- tert-butyl hydroperoxides are different
Propyl group) benzene, one kind or two in tert butyl peroxy benzoate and double (tert-butyl peroxide) hexanes of 2,5- dimethyl -2,5-
More than kind.I.e. described initiator is cumyl peroxide, double (2- t-butylperoxyisopropyls) benzene, tert-butyl hydroperoxide
More than one or both of double (tert-butyl peroxide) hexanes of benzoic ether, 2,5- dimethyl -2,5- (including two kinds).
The grafting efficiency of described itaconic anhydride grafted polylactic acid copolymer is 78%~92%.Higher grafting efficiency energy
Enough mechanical properties for further improving composite.
The preparation method of described itaconic anhydride grafted polylactic acid copolymer, comprises the following steps：
Dried PLA is cooled to 20-35 DEG C, itaconic anhydride and initiator is added and is well mixed, afterwards will be mixed
Uniform material is closed using double screw extruder melting extrusion, tie rod, air-cooled, granulation, itaconic anhydride grafted polylactic acid is obtained and is total to
Polymers.
The preparation of dried PLA includes：By PLA at 90~120 DEG C drying process 30-70min.Enter one
Step, the preparation of dried PLA include：By PLA at 100~110 DEG C drying process 30-60min, ensure PLA
Moisture content is less than 200ppm.
The screw slenderness ratio of described double screw extruder is 36:1~48:1, the temperature of described double screw extruder melting
Spend for 170 DEG C~190 DEG C.
In the preparation method, PLA, itaconic anhydride and initiator three pass through after twin-screw melting extrusion, obtain
Itaconic anhydride grafted polylactic acid copolymer, the reaction related generally to are as follows：
Wherein, n is 400-4000 integer, and m is 1-100 integer.
Described itaconic anhydride grafted polylactic acid copolymer, can be widely applied to field of high polymer material processing, is adapted to
Prepare in polyester based composites and polyester blend and be used as coupling agent.Particularly in lactic acid composite material and polylactic acid blend
In thing, the coupling effect of itaconic anhydride grafted polylactic acid copolymer is more effective.Itaconic anhydride grafted polylactic acid copolymer conduct
The interface coupling agent of polyester based composites, the adhesion of interface is greatly enhanced, significantly improve the mechanical property of composite.
The preparation method of described full biological poly lactic acid composite, comprises the following steps：
PLA, filler are added in mixer, drying process, and are well mixed；Then itaconic anhydride grafting is added
Copolymer of poly lactic acid, and be well mixed；Again, using double screw extruder melting extrusion, tie rod, air-cooled, granulation, given birth to entirely
Thing base polylactic acid composite material.
The condition of described drying process is：The drying process 20-80min at 95 DEG C~120 DEG C, further preferably,
Drying process 30-60min at 105 DEG C, ensure that PLA moisture content is less than 200ppm.
Compared with prior art, the invention has the advantages that：
Itaconic anhydride grafted polylactic acid copolymer in the present invention, its PLA and itaconic anhydride are entirely derived from biomass,
With recyclability, the dependence to oil is broken away from.Under initiator effect, itaconic anhydride is grafted to poly- breast by free radical mode
On acid molecule chain, there is high grafting rate, reactivity height, the simple advantage of preparation method, can be as a kind of new efficient idol
Join agent (interfacial compatibilizer), in polymer modification field.
In full biological poly lactic acid composite of the invention, using itaconic anhydride grafted polylactic acid copolymer, it can answer extensively
For field of high polymer material processing, particularly in lactic acid composite material and polylactic acid blend, itaconic anhydride grafting is poly-
The coupling effect of lactic acid copolymer is more effective.Interface of the itaconic anhydride grafted polylactic acid copolymer as polyester based composites
Coupling agent, the adhesion of interface is greatly enhanced, significantly improve the mechanical property of composite.Have broad application prospects.
Embodiment
In order that the technical problem to be solved in the present invention, technical scheme and effective effect are clearer, below by way of reality
Apply example and comparative example further describes the present invention, but the present invention is not limited to these embodiments.
Embodiment 1
A kind of itaconic anhydride grafted polylactic acid copolymer, using the formula of following parts by weight：
98.7 parts of PLA；
1 part of itaconic anhydride；
Double 0.3 part of (2- t-butylperoxyisopropyls) benzene；
Weigh the raw material of following weight：
PLA (4032D, U.S. Natureworks) 98.7Kg, (KD-13, Shouguang City's Coudé chemical industry are limited for itaconic anhydride
Company) 1Kg, double (2- t-butylperoxyisopropyls) benzene (Perkadox14, Akzo Nobel) 0.3Kg.
Preparation process is as follows：
PLA is added in high-speed mixer first, the drying process 45-50min at 105~110 DEG C, ensured poly-
Lactic acid moisture content is less than 200ppm；Then dried PLA is cooled to 25-30 DEG C；Itaconic anhydride and initiation are added again
Agent is simultaneously well mixed；Finally, using double screw extruder melting extrusion, tie rod, air-cooled, granulation, it is poly- to obtain itaconic anhydride grafting
Lactic acid copolymer, the screw slenderness ratio of double screw extruder is 40:1, the temperature of described double screw extruder melting is 170 DEG C
~190 DEG C.
Embodiment 2
A kind of itaconic anhydride grafted polylactic acid copolymer, using the formula of following parts by weight：
96 parts of PLA；
3 parts of itaconic anhydride；
Double 1 part of (2- t-butylperoxyisopropyls) benzene；
Weigh the raw material of following weight：
PLA (4032D, U.S. Natureworks) 96Kg, itaconic anhydride (KD-13, the limited public affairs of Shouguang City's Coudé chemical industry
Department) 3Kg, double (2- t-butylperoxyisopropyls) benzene (Perkadox14, Akzo Nobel) 1Kg.
Preparation process is as described in Example 1.
Embodiment 3
A kind of itaconic anhydride grafted polylactic acid copolymer, using the formula of following parts by weight：
93.5 parts of PLA；
5 parts of itaconic anhydride；
Double 1.5 parts of (2- t-butylperoxyisopropyls) benzene；
Weigh the raw material of following weight：
PLA (4032D, U.S. Natureworks) 93.5Kg, (KD-13, Shouguang City's Coudé chemical industry are limited for itaconic anhydride
Company) 5Kg, double (2- t-butylperoxyisopropyls) benzene (Perkadox14, Akzo Nobel) 1.5Kg.
Preparation process is as described in Example 1.
Embodiment 4
A kind of itaconic anhydride grafted polylactic acid copolymer, using the formula of following parts by weight：
96 parts of PLA；
3 parts of itaconic anhydride；
1 part of cumyl peroxide；
Weigh the raw material of following weight：
PLA (4032D, U.S. Natureworks) 96Kg, itaconic anhydride (KD-13, the limited public affairs of Shouguang City's Coudé chemical industry
Department) 3Kg, cumyl peroxide (Perkadox BC, Akzo Nobel) 1Kg.
Preparation process is as described in Example 1.
Embodiment 5
A kind of itaconic anhydride grafted polylactic acid copolymer, using the formula of following parts by weight：
96 parts of PLA；
3 parts of itaconic anhydride；
1 part of tert butyl peroxy benzoate；
Weigh the raw material of following weight：
PLA (4032D, U.S. Natureworks) 96Kg, itaconic anhydride (KD-13, the limited public affairs of Shouguang City's Coudé chemical industry
Department) 3Kg, tert butyl peroxy benzoate (Trigonox C, Akzo Nobel) 1Kg.
Preparation process is as described in Example 1.
Grafting rate calculating is carried out to embodiment 1-5, specific method is as follows：
Weigh the grain products w of melting extrusion preparation1(generally 10g or so), sample is placed in round-bottomed flask, is added
300ml chloroforms, lasting stirring, sample dissolving, continuation at the uniform velocity stir 15min, the chloroformic solution dissolved with sample are poured into 500ml
In ethanol, separate out sample.Above step 3 times, to remove remaining monomer, initiator, itaconic anhydride and its homopolymer.Most
Afterwards, the sample of purifying is placed in 60 DEG C of dry 24h in vacuum drying oven, weighs weight w after purification2.Grafting efficiency calculation formula
It is as follows：Wherein w1For the initial weight of sample, w2For sample weight after purification
Amount, ωPLAIt is as shown in table 1 for the weight fraction of PLA, concrete outcome.
The itaconic anhydride grafted polylactic acid copolymer grafted rate of table 1
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | |
| Grafting efficiency (%) | 85.6 | 83.2 | 80.5 | 82.6 | 83.4 |
Application examples 1
A kind of full biological poly lactic acid composite, using the formula of following parts by weight：
69 parts of PLA；
30 parts of cornstarch；
1 part of itaconic anhydride grafted polylactic acid (embodiment 1)；
PLA (4032D, U.S. Natureworks) 69Kg, cornstarch (are dried to the weight percentage of moisture and are
4.1%, Xingmao Corn Development Co., Ltd., Zhucheng) 30Kg, itaconic anhydride grafted polylactic acid (embodiment 1) 1Kg.
Preparation process is as follows：
PLA and cornstarch are added in high-speed mixer first, the drying process 45min at 105 DEG C, and mixed
Close uniformly, ensure that PLA moisture content is less than 200ppm；Then itaconic anhydride grafted polylactic acid copolymer is added, and is mixed equal
It is even；Again, using double screw extruder melting extrusion, tie rod, air-cooled, granulation, full biological poly lactic acid composite is obtained.
Application examples 2
A kind of full biological poly lactic acid composite, using the formula of following parts by weight：
69 parts of PLA；
30 parts of cornstarch；
1 part of itaconic anhydride grafted polylactic acid (embodiment 2)；
PLA (4032D, U.S. Natureworks) 69Kg, cornstarch (are dried to the weight percentage of moisture and are
4.1%, Xingmao Corn Development Co., Ltd., Zhucheng) 30Kg, itaconic anhydride grafted polylactic acid (embodiment 2) 1Kg.
Preparation process is as described in application examples 1.
Application examples 3
A kind of full biological poly lactic acid composite, using the formula of following parts by weight：
69 parts of PLA；
30 parts of cornstarch；
1 part of itaconic anhydride grafted polylactic acid (embodiment 3)；
PLA (4032D, U.S. Natureworks) 69Kg, cornstarch (are dried to the weight percentage of moisture and are
4.1%, Xingmao Corn Development Co., Ltd., Zhucheng) 30Kg, itaconic anhydride grafted polylactic acid (embodiment 3) 1Kg.
Preparation process is as described in application examples 1.
Application examples 4
A kind of full biological poly lactic acid composite, using the formula of following parts by weight：
69 parts of PLA；
30 parts of cornstarch；
1 part of itaconic anhydride grafted polylactic acid (embodiment 4)；
PLA (4032D, U.S. Natureworks) 69Kg, cornstarch (are dried to the weight percentage of moisture and are
4.1%, Xingmao Corn Development Co., Ltd., Zhucheng) 30Kg, itaconic anhydride grafted polylactic acid (embodiment 4) 1Kg.
Preparation process is as described in application examples 1.
Application examples 5
A kind of full biological poly lactic acid composite, using the formula of following parts by weight：
69 parts of PLA；
30 parts of cornstarch；
1 part of itaconic anhydride grafted polylactic acid (embodiment 5)；
PLA (4032D, U.S. Natureworks) 69Kg, cornstarch (are dried to the weight percentage of moisture and are
4.1%, Xingmao Corn Development Co., Ltd., Zhucheng) 30Kg, itaconic anhydride grafted polylactic acid (embodiment 5) 1Kg.
Preparation process is as described in application examples 1.
Application examples 6
A kind of full biological poly lactic acid composite, using the formula of following parts by weight：
PLA (4032D, U.S. Natureworks) 69Kg, cornstarch (are dried to the weight percentage of moisture and are
4.1%, Xingmao Corn Development Co., Ltd., Zhucheng) 15Kg, talcum powder 15Kg, itaconic anhydride grafted polylactic acid (embodiment 5)
1Kg。
Preparation process is as described in application examples 1.
Application examples 7
A kind of full biological poly lactic acid composite, using the formula of following parts by weight：
PLA (4032D, U.S. Natureworks) 79Kg, cornstarch (are dried to the weight percentage of moisture and are
4.1%, Xingmao Corn Development Co., Ltd., Zhucheng) 10Kg, talcum powder 10Kg, itaconic anhydride grafted polylactic acid (embodiment 5)
1Kg。
Preparation process is as described in application examples 1.
Application examples 8
A kind of full biological poly lactic acid composite, using the formula of following parts by weight：
PLA (4032D, U.S. Natureworks) 57Kg, cornstarch (are dried to the weight percentage of moisture and are
4.1%, Xingmao Corn Development Co., Ltd., Zhucheng) 20Kg, talcum powder 20Kg, itaconic anhydride grafted polylactic acid (embodiment 5)
3Kg。
Preparation process is as described in application examples 1.
Comparative example 1
A kind of full biological poly lactic acid composite, using the formula of following parts by weight：
70 parts of PLA；
30 parts of cornstarch；
PLA (4032D, U.S. Natureworks) 70Kg, cornstarch (are dried to the weight percentage of moisture and are
4.1%, Xingmao Corn Development Co., Ltd., Zhucheng) 30Kg.
Preparation process is as described in application examples 1.
Comparative example 2
A kind of full biological poly lactic acid composite, using the formula of following parts by weight：
69 parts of PLA；
30 parts of cornstarch；
1 part of methyl diphenylene diisocyanate；
PLA (4032D, U.S. Natureworks) 69Kg, cornstarch (are dried to the weight percentage of moisture and are
4.1%, Xingmao Corn Development Co., Ltd., Zhucheng) 30Kg, methyl diphenylene diisocyanate (MDI, Yantai Wanhua) 1Kg.
Preparation process is as described in application examples 1.
Comparative example 3
A kind of full biological poly lactic acid composite, using the formula of following parts by weight：
69 parts of PLA；
30 parts of cornstarch；
1 part of maleic anhydride grafted polylactic acid；
PLA (4032D, U.S. Natureworks) 69Kg, cornstarch (are dried to the weight percentage of moisture and are
4.1%, Xingmao Corn Development Co., Ltd., Zhucheng) 30Kg, maleic anhydride grafted polylactic acid 1Kg.The preparation process such as institute of application examples 1
State.
Application examples 1~8 and comparative example 1~2 are molded into behavioral standard batten respectively, and carry out tensile property test (GB/
T1040-92), bending property test (GB/T9341-2008) and Chalpy impact performance test (GB/1843-1996), as a result
As shown in table 2.
The mechanical property of the application examples of table 2 and comparative example contrasts
Application examples 1~8 with the addition of itaconic anhydride grafted polylactic acid copolymer prepared by the present invention, be a kind of High Efficient Bonding Agents
(interfacial compatibilizer), compared to the comparative example 1 for not adding compatilizer, add the contrast of compatilizer methyl diphenylene diisocyanate
Example 2, and the comparative example 3 of addition compatilizer maleic anhydride grafted polylactic acid, itaconic anhydride grafted polylactic acid of the invention copolymerization
Interface coupling agent of the thing as polyester based composites, the adhesion of interface is greatly enhanced, significantly improve the power of composite
Learn performance.Application examples 6~8 is compound using two kinds of biomass filler and inorganic filler, can further improve the power of composite
Learn performance.
The above embodiments are understood that for ease of those skilled in the art and using the present invention.This area
Technical staff being made to above-described embodiment and be modified and applied to other field without creativeness, therefore, the present invention
Above-described embodiment is not limited only to, the improvement and modification that those skilled in the art is made by the enlightenment of the present invention are at this
Within the protection domain of invention.
Claims (10)
1. a kind of full biological poly lactic acid composite, it is characterised in that be made up of the raw material of following percentage by weight：
PLA 55%~89%；
Filler 10%~40%；
Itaconic anhydride grafted polylactic acid 1%~5%.
2. full biological poly lactic acid composite according to claim 1, it is characterised in that by following percentage by weight
Raw material is made：
PLA 55%~79%；
Filler 15%~40%；
Itaconic anhydride grafted polylactic acid 1%~5%.
3. full biological poly lactic acid composite according to claim 1 or 2, it is characterised in that described filler is jade
It is more than one or both of rice starch, bamboo powder, cellulose, flaxen fiber, talcum powder, calcium carbonate, montmorillonite.
4. full biological poly lactic acid composite according to claim 1 or 2, it is characterised in that described itaconic anhydride
Grafted polylactic acid copolymer, itaconic anhydride is grafted on the strand of PLA by melting free radical grafting reaction, by with
The raw material of lower percentage by weight is made：
PLA 90%~99%；
Itaconic anhydride 0.5%~8%；
Initiator 0.1%~5%.
5. full biological poly lactic acid composite according to claim 4, it is characterised in that by following percentage by weight
Raw material is made：
PLA 93%~99%；
Itaconic anhydride 0.7%~6%；
Initiator 0.3%~3%.
6. full biological poly lactic acid composite according to claim 4, it is characterised in that described initiator is peroxide
It is double to change diisopropylbenzene (DIPB), double (2- t-butylperoxyisopropyls) benzene, tert butyl peroxy benzoate, 2,5- dimethyl -2,5-
It is more than one or both of (tert-butyl peroxide) hexane.
7. full biological poly lactic acid composite according to claim 4, it is characterised in that described itaconic anhydride grafting
The grafting efficiency of copolymer of poly lactic acid is 78%~92%.
8. the preparation method of the full biological poly lactic acid composite according to any one of claim 1~7, its feature exist
In comprising the following steps：
1) dried PLA is cooled to 20-35 DEG C, adds itaconic anhydride and initiator and be well mixed, afterwards will mixing
Uniform material obtains the copolymerization of itaconic anhydride grafted polylactic acid using double screw extruder melting extrusion, tie rod, air-cooled, granulation
Thing；
2) PLA, filler are added in mixer, drying process, and are well mixed；Then it is poly- to add itaconic anhydride grafting
Lactic acid copolymer, and be well mixed；Again, using double screw extruder melting extrusion, tie rod, air-cooled, granulation, full biology is obtained
Base polylactic acid composite material.
9. the preparation method of full biological poly lactic acid composite according to claim 8, it is characterised in that step 1)
In, the preparation of dried PLA includes：By PLA at 90~120 DEG C drying process 30-70min；
The screw slenderness ratio of described double screw extruder is 36:1~48:1, described double screw extruder melting temperature be
170 DEG C~190 DEG C.
10. the preparation method of full biological poly lactic acid composite according to claim 8, it is characterised in that step 2)
In, the condition of described drying process is：The drying process 20-80min at 95 DEG C~120 DEG C.
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| CN201711058047.3A Active CN107759990B (en) | 2017-11-01 | 2017-11-01 | Full-bio-based polylactic acid composite material and preparation method thereof |
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| CN110903491A (en) * | 2019-12-12 | 2020-03-24 | 湖南绿燊环保科技有限公司 | Flame retardant, modified polylactic acid and preparation method thereof |
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