CN109486083A - A kind of biodegradable blend film and preparation method thereof - Google Patents
A kind of biodegradable blend film and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2351/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2351/02—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to polysaccharides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2451/02—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to polysaccharides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
Abstract
The present invention relates to a kind of biodegradable blend films and preparation method thereof, belong to polymeric material field.It is made of raw material from the following weight: 10~50 parts of polylactic acid, 40 parts of poly- (terephthalic acid (TPA) butanediol-co- adipate ester), 10~50 parts of maleic anhydride graft thermoplastic starch, 1~2 part of expanding material, 0.2~0.5 part of dispersing agent, 0.10~0.15 part of chain extender, 1.0~1.5 parts of lubricant, 0.5~1 part of opening agent.Advantage is: being used in blown film resin after low-cost starch is modified, film degradation rate can be improved while reducing cost again, value is had important application for alleviation " white pollution ", for high-content polylactic acid film, with lower cost, degradation rate is faster.
Description
Technical field
The present invention relates to polymeric material fields, and in particular to a kind of biodegradable blend film and preparation method thereof.
Background technique
Recent decades, biodegradable polymers are agricultural thin since it is in food packaging, biological medicine and medical usage
The extensive use in the fields such as film and disposable product and receive significant attention.Currently, researcher to Biodegradable material and
The exploitation of the consumer product area of recyclable materials is very interested.Polylactic acid (PLA) is taking the lead in race for emerging biological plastics market
Person, the structure with optimal availability and most attraction.PLA is a kind of biodegradable thermoplastic macromolecule material,
With excellent processing performance, while having similar to the rigid of polystyrene (PS) and polyethylene terephthalate (PET)
Property and transparency, can be reabsorbed under industrial composting conditions with it is biodegradable.But polylactic acid has the defect of its own, such as matter
Hard and crisp, shock resistance and tensile deformation ability are poor, and thermal stability is poor and expensive etc..These are insufficient seriously to limit poly- cream
The large-scale development of acid and application.
There are many report of the plasticization and modification of polylactic acid, such as epoxidized soybean oil, polyethylene glycol, polypropylene glycol, polyesters plasticising
Agent can plasticization and modification polylactic acid, citric acid ester plasticizer be effectively the environment-friendly plasticizers for generally acknowledging that effect is best.Polylactic acid increases
There are many method of tough modification, and most effective environment-friendly degradable toughener mainly has PBAT, poly-succinic fourth diester (PBS) He Juding
Diacid adipic acid butanediol copolyester (PBSA).Currently, PBAT price is lower than PBS and PBSA, thus it is widely used.
Jeff Schneider et al. has delivered polylactic acid and PBAT and has expanded in the Joncryl 4368C with epoxy-functional
Modified research (the Journal of Application Polymer for preparing inflation film of reactive blending under the action of chain agent
Science, 2016,133:43310), chain extender improves polylactic acid and the compatibility of PBAT, and physical and mechanical properties have been made
Extraordinary inflation film.
Starch due to its with it is cheap, renewable, inexhausted and can be degradable etc. advantages, be that current use is most wide
General a kind of polysaccharide natural materials.It is formed through light action by water and carbon dioxide by green plants, is mainly enriched in
In the plant organs such as seed, root tuber, stem tuber, abundance is usually present in corn, wheat, rice and soil in granular form
In the plants such as beans.By the way that starch to be blended with PLA, PBAT, product cost can be greatly reduced, while improving the biology drop of product
Solve performance.But common starch strand interacts to form intermolecular and intramolecular hydrogen bond by hydroxyl, does not have when directly heating
There is melting process, 300 DEG C or more are decomposed, and do not have processing performance, it is difficult to obtain that there is good object by simple be directly blended
The material of rationality energy.The method for generalling use starch plasticizing at present improves the compatibility of blend.
Wang Huizhen et al. is prepared for heat with single step reaction extrusion molding in single screw extrusion machine using maleic anhydride as expanding material
Plasticity dried starch, lactic acid composite material.Test result shows that the compatible of material can be improved using maleic anhydride as expanding material
Property.Extension test data show, increase-volume thermoplasticity dried starch, lactic acid composite material tensile strength than original composite material
The high 40.5MPa of tensile strength.
Lu Xiuling et al. is first added small molecule plasticizer glycerol and is become TPS, then adds Acetylated potato starch again, raw
Has hydrophobicity completely at AS, AS, ester group can be more effectively dispersed in PLA matrix instead of hydroxyl, than TPS.
10% polyethylene-polypropylene ethylene glycol plasticizer and 1% 2 hydrocyanic ester salt (MDI) expanding material is added in Xu Yuqiong et al.
Compatibility it is better than being individually added into MDI, elongation at break can reach 870%, be that current to improve PLA/ starch composite material tough
One of property most efficient method.
Application No. is 20151034780.3 Chinese invention patents to disclose a kind of whole degrading film and preparation method thereof.
The film is with polylactic acid, poly (propylene carbonate), and polyadipate, butylene terephthalate and heat stabilizer composition, this is thin
Film has excellent toughness and complete biodegradable.
Application No. is 201410647194.4 Chinese invention patents to disclose a kind of transparent tear-proof polylactic acid biology drop
Degrading film and preparation method thereof.PLA and PBC, the auxiliary agents such as plasticizer polyadipate 1,2-PD ester through mixed at high speed, make by extrusion
PLA Biodegradable film, film tensile strength with higher and transparency are processed into through blown film after grain drying.
Application No. is the Chinese invention patents of 201410662335.X to disclose the transparent polylactic acid film of high tenacity and its system
Preparation Method.Include raw material: 97-85 parts of polylactic acid, 3-15 parts of toughener and 0.1-0.6 parts of heat stabilizer group
At the film has higher part toughness and the good transparency.
Application No. is 20141022528.6 Chinese patents to disclose a kind of biodegradable flexible and transparent polylactic acid film
And preparation method thereof, which includes raw material: 30-90 polylactic acid, toughener 1-50, compatilizer 0.1-10, plasticizer
1-30.The toughener that the film uses is biodegradable class material, and compatilizer compatibility used is good, used plasticising
Agent is high-efficient, safe and non-toxic.The Biodegradable polylactic acids film not only has good mechanical property, but also shows very well
The transparency and flexibility.
Zhang Huiliang et al. discloses a kind of transparent tear-proof in the Chinese invention patent application No. is 201410647194.4
Polylactic acid Biodegradable film and preparation method thereof, by polylactic acid, toughener, plasticizer, lubricant, opening agent mixture
Composition.The tensile strength of polylactic acid film is up to 43.2MPa, and up to 48%, angle tear strength reaches tension fracture elongation rate
127KN/m。
Summary of the invention
The present invention provides a kind of biodegradable blend film and preparation method thereof, at high cost, the market that solves polylactic acid
The problems such as competitiveness is poor.
The present invention takes the technical solution to be: it is made of raw material from the following weight:
10~50 parts of polylactic acid PLA, 40 parts of PBAT of poly- (terephthalic acid (TPA) butanediol-co- adipate ester), maleic anhydride
10~50 parts of graft thermoplastic starch MTPS, 1~2 part of expanding material, 0.2~0.5 part of dispersing agent, 0.10~0.15 part of chain extender,
1.0~1.5 parts of lubricant, 0.5~1 part of opening agent.
The expanding material is methylenediphenyl diisocyanates (MDI), acyl group sour (AA) and metering system acid glycerol
One of the copolymer (PLA-GMA) of ester (GMA) grafting.
The dispersing agent is one of polyethylene wax, ethylene double oleamide, alkoxy-functional siloxanes.
The chain extender is Styrene And Chloroalkyl Acrylates-glycidyl methacrylate copolymer.
The lubricant is ethylene bis stearic acid amide, zinc stearate, aluminum stearate, at least one in calcium stearate
Kind.
The opening agent is erucyl amide.
The maleic anhydride graft thermoplastic starch MTPS's the preparation method is as follows:
(1) preplasticizing of starch: starch is 4 hours dry at 100 DEG C, and starch and glycerol that mass ratio is 75:25 are mixed
The speed of object 1800rad/min under conditions of 120 DEG C in high-speed mixer stirs 30min；
(2) maleic anhydride that mass fraction is 1wt% is added in the resulting preplasticizing starch of step (1), is squeezed out, wind
Cold, pelletizing obtains maleic anhydride graft thermoplastic starch, and wherein each area's temperature of extruder is successively are as follows: 130 DEG C, 145 DEG C, 155 DEG C,
160℃、160℃、165℃、165℃、165℃、165℃。
A kind of preparation method of biodegradable blend film: include the following steps:
(1) polylactic acid PLA, poly- (terephthalic acid (TPA) butanediol-co- adipate ester) PBAT, maleic anhydride graft thermoplastic
Starch MTPS blending extrusion: weighing PLA10~50 part, PBAT40 parts, MTPS10~50 part, 1~2 part of expanding material by weight, point
0.2~0.5 part of powder, 0.10~0.15 part of chain extender, 1.0~1.5 parts of lubricant, 0.5~1 part of opening agent；
It squeezes out that batten is water cooled, air-dried, pelletizing in double screw extruder, PLA/PBAT/MTPS pellet is obtained, at 60 DEG C
Lower freeze-day with constant temperature is for 24 hours；Wherein each area's temperature of extruder is successively are as follows: 140 DEG C, 155 DEG C, 170 DEG C, 175 DEG C, 175 DEG C, 175 DEG C,
175 DEG C, 175 DEG C, 170 DEG C, screw speed 200-230rpm；
(2) blown film: squeezing out inflation film manufacturing machine with single screw rod for the PLA/PBAT/MTPS pellet of step (1) preparation and be blow molded into film,
The temperature in each area of inflation film manufacturing machine is successively are as follows: 150 DEG C, 153 DEG C, 156 DEG C, 158 DEG C, 160 DEG C, screw speed 65rpm, blow-up ratio are
6:1, draw ratio 5:1, hauling speed 5.8m/min, mist line height are 140mm.
The invention has the advantages that: it is used in blown film resin after low-cost starch is modified, again may be used while reducing cost
To improve film degradation rate, value is had important application for alleviation " white pollution ", it is thin relative to high-content polylactic acid
For film, there is lower cost, degradation rate is faster.
Specific embodiment
In following embodiment, the preparation method of maleic anhydride graft thermoplastic starch MTPS is:
(1) preplasticizing of starch: starch is 4 hours dry at 100 DEG C, and starch and glycerol that mass ratio is 75:25 are mixed
The speed of object 1800rad/min under conditions of 120 DEG C in high-speed mixer stirs 30min；
(2) maleic anhydride that mass fraction is 1wt% is added in the resulting preplasticizing starch of step (1), is squeezed out, wind
Cold, pelletizing obtains maleic anhydride graft thermoplastic starch, and wherein each area's temperature of extruder is successively are as follows: 130 DEG C, 145 DEG C, 155 DEG C,
160℃、160℃、165℃、165℃、165℃、165℃。
Embodiment 1
(1) weigh by weight 10 parts of polylactic acid PLA, PBAT40 parts of poly- (terephthalic acid (TPA) butanediol-co- adipate ester),
50 parts of maleic anhydride graft thermoplastic starch MTPS, 1 part of methylenediphenyl diisocyanates (MDI), 0.2 part of polyethylene wax,
0.10 part of Styrene And Chloroalkyl Acrylates-glycidyl methacrylate copolymer, 1 part of ethylene bis stearic acid amide, erucyl amide
0.5 part；
It squeezes out that batten is water cooled, air-dried, pelletizing in double screw extruder, PLA/PBAT/MTPS pellet is obtained, at 60 DEG C
Lower freeze-day with constant temperature is for 24 hours；Wherein each area's temperature of extruder is successively are as follows: 140 DEG C, 155 DEG C, 170 DEG C, 175 DEG C, 175 DEG C, 175 DEG C,
175 DEG C, 175 DEG C, 170 DEG C, screw speed 200rpm；
(2) blown film: squeezing out inflation film manufacturing machine with single screw rod for the PLA/PBAT/MTPS pellet of step (1) preparation and be blow molded into film,
The temperature in each area of inflation film manufacturing machine is successively are as follows: 150 DEG C, 153 DEG C, 156 DEG C, 158 DEG C, 160 DEG C, screw speed 65rpm, blow-up ratio are
6:1, draw ratio 5:1, hauling speed 5.8m/min, mist line height are 140mm.
Embodiment 2
(1) weigh by weight 20 parts of polylactic acid PLA, PBAT40 parts of poly- (terephthalic acid (TPA) butanediol-co- adipate ester),
40 parts of maleic anhydride graft thermoplastic starch MTPS, 1 part of methylenediphenyl diisocyanates (MDI), 0.3 part of polyethylene wax,
0.12 part of Styrene And Chloroalkyl Acrylates-glycidyl methacrylate copolymer, 1.3 parts of ethylene bis stearic acid amide, erucyl amide
0.8 part；
It squeezes out that batten is water cooled, air-dried, pelletizing in double screw extruder, PLA/PBAT/MTPS pellet is obtained, at 60 DEG C
Lower freeze-day with constant temperature is for 24 hours；Wherein each area's temperature of extruder is successively are as follows: 140 DEG C, 155 DEG C, 170 DEG C, 175 DEG C, 175 DEG C, 175 DEG C,
175 DEG C, 175 DEG C, 170 DEG C, screw speed 215rpm；
(2) blown film: squeezing out inflation film manufacturing machine with single screw rod for the PLA/PBAT/MTPS pellet of step (1) preparation and be blow molded into film,
The temperature in each area of inflation film manufacturing machine is successively are as follows: 150 DEG C, 153 DEG C, 156 DEG C, 158 DEG C, 160 DEG C, screw speed 65rpm, blow-up ratio are
6:1, draw ratio 5:1, hauling speed 5.8m/min, mist line height are 140mm.
Embodiment 3
(1) weigh by weight 30 parts of polylactic acid PLA, PBAT40 parts of poly- (terephthalic acid (TPA) butanediol-co- adipate ester),
1.5 parts of 30 parts of maleic anhydride graft thermoplastic starch MTPS, acyl group sour (AA), ethylene double 0.3 part of oleamides, styrene-the third
0.13 part of olefin(e) acid-glycidyl methacrylate copolymer, 1.5 parts of zinc stearate, 1 part of erucyl amide；
It squeezes out that batten is water cooled, air-dried, pelletizing in double screw extruder, PLA/PBAT/MTPS pellet is obtained, at 60 DEG C
Lower freeze-day with constant temperature is for 24 hours；Wherein each area's temperature of extruder is successively are as follows: 140 DEG C, 155 DEG C, 170 DEG C, 175 DEG C, 175 DEG C, 175 DEG C,
175 DEG C, 175 DEG C, 170 DEG C, screw speed 220rpm；
(2) blown film: squeezing out inflation film manufacturing machine with single screw rod for the PLA/PBAT/MTPS pellet of step (1) preparation and be blow molded into film,
The temperature in each area of inflation film manufacturing machine is successively are as follows: 150 DEG C, 153 DEG C, 156 DEG C, 158 DEG C, 160 DEG C, screw speed 65rpm, blow-up ratio are
6:1, draw ratio 5:1, hauling speed 5.8m/min, mist line height are 140mm.
Embodiment 4
(1) weigh by weight 40 parts of polylactic acid PLA, PBAT40 parts of poly- (terephthalic acid (TPA) butanediol-co- adipate ester),
The copolymer (PLA-GMA) 1.7 that 20 parts of maleic anhydride graft thermoplastic starch MTPS, glyceral methacrylate (GMA) are grafted
It is part, 0.3 part of alkoxy-functional siloxanes, 0.15 part of Styrene And Chloroalkyl Acrylates-glycidyl methacrylate copolymer, hard
0.5 part of resin acid aluminium, 1 part of calcium stearate, 1 part of erucyl amide；
It squeezes out that batten is water cooled, air-dried, pelletizing in double screw extruder, PLA/PBAT/MTPS pellet is obtained, at 60 DEG C
Lower freeze-day with constant temperature is for 24 hours；Wherein each area's temperature of extruder is successively are as follows: 140 DEG C, 155 DEG C, 170 DEG C, 175 DEG C, 175 DEG C, 175 DEG C,
175 DEG C, 175 DEG C, 170 DEG C, screw speed 210rpm；
(2) blown film: squeezing out inflation film manufacturing machine with single screw rod for the PLA/PBAT/MTPS pellet of step (1) preparation and be blow molded into film,
The temperature in each area of inflation film manufacturing machine is successively are as follows: 150 DEG C, 153 DEG C, 156 DEG C, 158 DEG C, 160 DEG C, screw speed 65rpm, blow-up ratio are
6:1, draw ratio 5:1, hauling speed 5.8m/min, mist line height are 140mm.
Embodiment 5
50 parts of polylactic acid PLA, poly- (terephthalic acid (TPA) butanediol-co- adipate ester) PBAT40 parts, Malaysia are weighed by weight
10 parts of acid anhydrides graft thermoplastic starch MTPS, 2 parts of methylenediphenyl diisocyanates (MDI), 0.5 part of polyethylene wax, benzene second
0.15 part of alkene-acrylic acid-methacrylic acid polyglycidyl copolymer, 1.5 parts of ethylene bis stearic acid amide, 1 part of erucyl amide；
It squeezes out that batten is water cooled, air-dried, pelletizing in double screw extruder, PLA/PBAT/MTPS pellet is obtained, at 60 DEG C
Lower freeze-day with constant temperature is for 24 hours；Wherein each area's temperature of extruder is successively are as follows: 140 DEG C, 155 DEG C, 170 DEG C, 175 DEG C, 175 DEG C, 175 DEG C,
175 DEG C, 175 DEG C, 170 DEG C, screw speed 230rpm；
(2) blown film: squeezing out inflation film manufacturing machine with single screw rod for the PLA/PBAT/MTPS pellet of step (1) preparation and be blow molded into film,
The temperature in each area of inflation film manufacturing machine is successively are as follows: 150 DEG C, 153 DEG C, 156 DEG C, 158 DEG C, 160 DEG C, screw speed 65rpm, blow-up ratio are
6:1, draw ratio 5:1, hauling speed 5.8m/min, mist line height are 140mm.
The film that Examples 1 to 5 is obtained, tensile strength according to GB/T 1040.2-2006 test, tearing strength according to
GB/T529-2008 test, data are as shown in table 1；Permeability test is tested according to GB/T1038-2000, data such as table 2
It is shown.
The mechanical property of 1 Examples 1 to 5 film of table
| Test index | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 |
| Longitudinal tensile strength/MPa | 12.4 | 13.6 | 16.2 | 18.3 | 20.7 |
| Transverse tensile strength/MPa | 10.9 | 11.6 | 13.9 | 15.6 | 17.6 |
| Machine direction tear/(KN/m) | 46.3 | 51.9 | 58.4 | 65.9 | 72.9 |
| Cross direction tear strength/(KN/m) | 59.7 | 64.7 | 69.9 | 72.9 | 78.5 |
The permeability of 2 Examples 1 to 5 film of table
By table 1 and data it is found that with PLA content increase, the reduction of MTPS content, the tensile strength of blend film and
Tearing strength gradually increases.From the data in table 2, it can be seen that MTPS content is higher, the oxygen resistance of film is better.Because in MTPS
Containing hydrogen bond, hydrogen bond action results in the formation of physical cross-linked network structure in composite system, and hydrogen bond action is stronger, makes thin
Each component is more evenly dispersed in film, to improve the barrier property of film.
Claims (8)
1. a kind of biodegradable blend film, which is characterized in that be made of raw material from the following weight:
10~50 parts of polylactic acid PLA, 40 parts of PBAT of poly- (terephthalic acid (TPA) butanediol-co- adipate ester), maleic anhydride grafting
10~50 parts of thermoplastic starch MTPS, 1~2 part of expanding material, 0.2~0.5 part of dispersing agent, 0.10~0.15 part of chain extender, lubrication
1.0~1.5 parts of agent, 0.5~1 part of opening agent.
2. a kind of biodegradable blend film according to claim 1, which is characterized in that the expanding material is methylene
Copolymer (the PLA- of base diphenyl diisocyanate (MDI), acyl group sour (AA) and glyceral methacrylate (GMA) grafting
One of GMA).
3. a kind of biodegradable blend film according to claim 1, which is characterized in that the dispersing agent is poly- second
One of alkene wax, ethylene double oleamide, alkoxy-functional siloxanes.
4. a kind of biodegradable blend film according to claim 1, which is characterized in that the chain extender is benzene second
Alkene-acrylic acid-methacrylic acid polyglycidyl copolymer.
5. a kind of biodegradable blend film according to claim 1, which is characterized in that the lubricant is ethylene
At least one of double stearic amides, zinc stearate, aluminum stearate, calcium stearate.
6. a kind of biodegradable blend film according to claim 1, which is characterized in that the opening agent is erucic acid
Amide.
7. a kind of biodegradable blend film according to claim 1, which is characterized in that the maleic anhydride grafting
Thermoplastic starch MTPS's the preparation method is as follows:
(1) preplasticizing of starch: starch is 4 hours dry at 100 DEG C, and starch and glycerol mixture that mass ratio is 75:25 are existed
The speed of 1800rad/min stirs 30min under conditions of 120 DEG C in high-speed mixer；
(2) maleic anhydride that mass fraction is 1wt% is added in the resulting preplasticizing starch of step (1), is squeezed out, it is air-cooled,
Pelletizing obtains maleic anhydride graft thermoplastic starch, and wherein each area's temperature of extruder is successively are as follows: 130 DEG C, 145 DEG C, 155 DEG C, 160
℃、160℃、165℃、165℃、165℃、165℃。
8. a kind of preparation method of biodegradable blend film, characterized in that it comprises the following steps:
(1) polylactic acid PLA, poly- (terephthalic acid (TPA) butanediol-co- adipate ester) PBAT, maleic anhydride graft thermoplastic starch
MTPS blending extrusion:
PLA10~50 part, PBAT40 parts, MTPS10~50 part, 1~2 part of expanding material, dispersing agent 0.2~0.5 are weighed by weight
Part, 0.10~0.15 part of chain extender, 1.0~1.5 parts of lubricant, 0.5~1 part of opening agent；Sample is squeezed out in double screw extruder
Item is water cooled, air-dried, pelletizing, obtains PLA/PBAT/MTPS pellet, and freeze-day with constant temperature is for 24 hours at 60 DEG C；Wherein each area's temperature of extruder
Degree is successively are as follows: 140 DEG C, 155 DEG C, 170 DEG C, 175 DEG C, 175 DEG C, 175 DEG C, 175 DEG C, 175 DEG C, 170 DEG C, screw speed 200-
230rpm；
(2) blown film: the PLA/PBAT/MTPS pellet of step (1) preparation is squeezed out into inflation film manufacturing machine with single screw rod and is blow molded into film, blown film
The temperature in the area Ji Ge is successively are as follows: 150 DEG C, 153 DEG C, 156 DEG C, 158 DEG C, 160 DEG C, screw speed 65rpm, blow-up ratio 6:1,
Draw ratio is 5:1, and hauling speed 5.8m/min, mist line height is 140mm.
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Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109929228A (en) * | 2019-04-17 | 2019-06-25 | 谷水英 | Green biodegradable plastics film and its processing technology |
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| CN111718566A (en) * | 2019-03-22 | 2020-09-29 | 汉达精密电子(昆山)有限公司 | PLA/PBAT biodegradable composite material and product thereof |
| CN109929228A (en) * | 2019-04-17 | 2019-06-25 | 谷水英 | Green biodegradable plastics film and its processing technology |
| CN110283438A (en) * | 2019-07-22 | 2019-09-27 | 中国科学院长春应用化学研究所 | A kind of base resin and blow molding degradable films of blow molding degradable films |
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