CN109553945A - A kind of environment protection type heat insulating plastic film and its preparation process - Google Patents
A kind of environment protection type heat insulating plastic film and its preparation process Download PDFInfo
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Abstract
The invention discloses a kind of environment protection type heat insulating plastic films, are made of the raw material of following parts by weight: 30-40 parts of polylactic acid, 20-30 parts of poly terephthalic acid tetramethylene adipate, 4-6 parts of glycerol, 8-12 parts of modified plant fibers, 1-2 parts of antibacterial agent, 60-80 parts of chloroform；The invention also discloses the preparation processes of the environment protection type heat insulating plastic film.The present invention using polylactic acid and poly terephthalic acid tetramethylene adipate as plastic film matrix, both for biodegradable high polymer, poly terephthalic acid tetramethylene adipate can effective plasticizing polylactic acid, overcome the weakness that polylactic acid is brittle；By the enhancing of modified plant fibers, so that PLA material bending modulus increases substantially, enhance Compound Material Engineering characteristic；By the addition of micro antibacterial agent, make film that there is bacteriostasis property；Processing obtains a kind of biodegradable green, excellent in mechanical performance and heatpiston's film with bacteriostasis property.
Description
Technical field
The invention belongs to plastic film technical fields, and in particular, to a kind of environment protection type heat insulating plastic film and its preparation
Technique.
Background technique
Scientific and technological level continue to develop today, plastic membrane product at people life in institute it is common and can not or
Scarce thing, the plastic films such as disposable plastic bag, express packaging bag are seen everywhere.The raw material of conventional plastic film article is mostly
The various derivatives of petroleum, and it is well known that petroleum belongs to non-renewable resources, so finding before petroleum resources are exhausted
The suitable even better plastic-substitute of performance is very urgent.On the other hand, it with the enhancing of people's environmental consciousness, chases after merely
Ask the epoch of properties of product to pass by, nowadays people with greater need for be the environment friendly of plastic product itself, so can give birth to
Object Devlopment of Degradable Plastics product comes into being.Biodegradable plastics refers to such as bacterium, mould of the microorganism as existing for nature
The effect of bacterium (fungi) and algae and cause degradation plastics.Existing biodegradable plastic film is mostly by natural polymer
Material and various polyester blends or copolymerization are come what is prepared, and although material obtained is biodegradable to some of them, but it is made
Standby process will use poisonous and hazardous catalyst, crosslinking agent etc..
Many existing Biodegradable plastic films, can't widely meet the requirements in service performance, such as China
Patent CN101235156 discloses a kind of using polylactic acid as full-biodegradable plastic film of matrix and preparation method thereof.However
Due to polylactic acid glass transition temperature is low, under room temperature it is also more crisp, the poor toughness of product, tearing toughness are low, product using temperature
Degree is also by larger limitation.For another example CN200810051415.6 discloses a kind of using poly (propylene carbonate) as the complete biodegradable of base
Plastic film and preparation method thereof, the flexibility and tearing toughness of poly (propylene carbonate) are high, but glass transition temperature is than poly- cream
Acid is also low, and only 35-40 DEG C, prepared full-biodegradable plastic film is only used for low temperature place.
Summary of the invention
The purpose of the present invention is to provide a kind of environment protection type heat insulating plastic film and its preparation processes, using polylactic acid
(PLA) and poly terephthalic acid tetramethylene adipate (PBAT) is used as plastic film matrix, both for biodegradable
High polymer, poly terephthalic acid tetramethylene adipate can effective plasticizing polylactic acid, overcome the weakness that polylactic acid is brittle；Pass through
The enhancing of modified plant fibers enhances Compound Material Engineering characteristic and heat-insulated so that PLA material bending modulus increases substantially
Performance；By the addition of micro antibacterial agent, antibacterial agent includes nano-titanium dioxide and tea polyphenols, and nano-titania particle can be from
It is slowly released in film, plays anti-microbial property, film makes film be provided with good anti-oxidant energy by combining tea polyphenols
Power enhances fungistatic effect in terms of anti-oxidant；Processing obtains a kind of biodegradable green, excellent in mechanical performance and has suppression
Heatpiston's film of bacterium performance.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of environment protection type heat insulating plastic film, is made of the raw material of following parts by weight: 30-40 parts of polylactic acid is gathered to benzene two
20-30 parts of formic acid tetramethylene adipate, 4-6 parts of glycerol, 8-12 parts of modified plant fibers, 1-2 parts of antibacterial agent, chloroform
60-80 parts；
The environment protection type heat insulating plastic film is made of following steps:
Step S1, first that polylactic acid and poly terephthalic acid tetramethylene adipate is dry in 60 DEG C of vacuum drying oven
8h, drying are placed in double screw extruder, and glycerol is added, and using double screw extruder extruding pelletization, are squeezed out in 190 DEG C, into
Material speed is 100g/min；
Step S2, plastics basal granule obtained above is put into 70 DEG C of vacuum drying oven dry 6-7h, 2/3 trichlorine is added
In methane, magnetic agitation obtains plastics basal granule solution to being completely dissolved at room temperature；
Step S3, modified plant fibers are added into remaining 1/3 chloroform, homogeneous 15min, obtain modified plant
Fibres suspension；
Step S4, modified plant fibers suspension and antibacterial agent are slowly added in plastics basal granule solution, first magnetic agitation
10h is mixed them thoroughly, then is placed in ultrasound 30min in ice-water bath and is made each mutually evenly dispersed, and mixed liquor is obtained；
Step S5, mixed liquor is poured into glass culture dish, volatilization for 24 hours, is then placed in 60 DEG C of vacuum and dries naturally at room temperature
Dry 12h takes off film to completely remove solvent to get the plastic film for being 55-65um to average thickness in case after taking-up.
Further, the antibacterial agent is prepared by the following method:
1) it weighs 1.5g tea polyphenols to be added in 200mL dehydrated alcohol, stirring makes it completely dissolved；
2) 3.6g polyethylene glycol is added into above-mentioned solution again, continues after stirring 15-20min, 0.8g nano-silica is added
Change titanium, antibacterial agent is made in room temperature ultrasound 30min.
Further, the modified plant fibers are prepared by the following method:
1) plant fiber is chopped as 8-12cm segment, being soaked in concentration according to solid-to-liquid ratio 1g:20-30mL is 15g/L's
In NaOH solution, 48h is impregnated at room temperature, is washed to filtrate pH to neutrality, 80 DEG C of drying with a large amount of deionized waters after taking-up；
2) item for being 85s in moisture content 12%, steam explosion pressure 1.85MPa, dimension pressure time by above-mentioned processed fiber
Steam explosion under part is then washed with deionized to filtrate pH to neutrality, and 80 DEG C dry；
3) will be fiber bleached after above-mentioned steam explosion, solid-to-liquid ratio 1:15, bleaching liquid contains 1% Na2SiO3, 2% NaOH,
1% H2O2, 60 DEG C are washed to neutrality after processing 3 hours, 80 DEG C of drying；
4) fiber after drying is heat-treated at 145 DEG C 14min, then will be heat-treated according to solid-liquid ratio 1g:10-13mL
Fiber afterwards is added in deionized water, and ice-water bath ultrasonic disperse 3 times, each 10min obtains fiber water slurry；
5) polyethylene glycol is dissolved in deionized water, is configured to the Aqueous Solutions of Polyethylene Glycol that mass fraction is 20%, according to
Fiber water slurry is poured slowly into Aqueous Solutions of Polyethylene Glycol by volume ratio 1:5, and magnetic force Jiao mixes 2h at room temperature, then at 90 DEG C of water-baths
Aqueous solvent is evaporated in middle stirring, reduces 2/3-5/6 to solvent, is transferred to 60 DEG C of vacuum ovens and stays overnight, improved plant is made
Fiber；
Wherein, plant fiber is ramie, hemp, sisal hemp, abaca, kapok or cocoanut fiber.
A kind of preparation process of environment protection type heat insulating plastic film, includes the following steps:
Step S1, first that polylactic acid and poly terephthalic acid tetramethylene adipate is dry in 60 DEG C of vacuum drying oven
8h, drying are placed in double screw extruder, and glycerol is added, and using double screw extruder extruding pelletization, are squeezed out in 190 DEG C, into
Material speed is 100g/min；
Step S2, plastics basal granule obtained above is put into 70 DEG C of vacuum drying oven dry 6-7h, 2/3 trichlorine is added
In methane, magnetic agitation obtains plastics basal granule solution to being completely dissolved at room temperature；
Step S3, modified plant fibers are added into remaining 1/3 chloroform, homogeneous 15min, obtain modified plant
Fibres suspension；
Step S4, modified plant fibers suspension and antibacterial agent are slowly added in plastics basal granule solution, first magnetic agitation
10h is mixed them thoroughly, then is placed in ultrasound 30min in ice-water bath and is made each mutually evenly dispersed, and mixed liquor is obtained；
Step S5, mixed liquor is poured into glass culture dish, volatilization for 24 hours, is then placed in 60 DEG C of vacuum and dries naturally at room temperature
Dry 12h takes off film to completely remove solvent to get the plastic film for being 55-65um to average thickness in case after taking-up.
Further, the draw ratio of double screw extruder described in step S1 is 32:1, screw diameter 20mm, and revolving speed is
100rpm。
Beneficial effects of the present invention:
The present invention, which is gathered by polylactic acid with poly terephthalic acid tetramethylene adipate, to be blended, terephthalic acid (TPA) adipic acid fourth
Diol ester (PBAT) is petroleum base polyester but has the copolymer of complete biocompatibility, has high ductibility, low elasticity
Modulus, can effective plasticizing polylactic acid (PLA)；Glycerol serves as the effect of chain extender, and glycerol is blended with PLA and PBAT, can
Improve the compatibility of blend polymer and increase the interface adhesiveness between matrix and dispersed phase, makes PLA, the macromolecule of PBAT
Chemically reacted between chain and glycerol, form cavity, the gap between the layer as caused by Voiding show PLA and PBAT it
Between good Interface Adhesion, so that plastic film obtained is shown good toughness；
The present invention uses modified plant fibers enhanced film, and heat treatment can reduce the polarity of plant fiber, improve fiber with
The interfacial adhesion performance of basis material is modified the fiber after heat treatment by polyethylene glycol, polyethylene glycol energy and fiber
The hydroxyl isoreactivity group on surface reacts, and is coated on fiber surface, and polyethylene glycol can be fully compatible with polylactic acid, is coated with
The fiber of polyethylene glycol can be better dispersed in polylactic acid, and when composite material generates bending deformation, plant fiber is excellent to be resisted
Characteristic is drawn to slow down the elongation strain of composite material lower, the addition of plant fiber is so that PLA material bending modulus significantly mentions
It is high；By modified, composite material section defect is reduced plant fiber, the enhancing of two-phase compatibility, and obtained plastic film is fine and close
Property enhancing, the heat-proof quality of plastic film can be effectively improved；
The present invention joined antibacterial agent in thin-film material, and antibacterial agent includes nano-titanium dioxide and tea polyphenols, poly- second two
Alcohol can be attached to nano-titania particle surface, make nano-TiO2It is dispersed in thin-film material, nano-titanium dioxide
With excellent chemical stability, also with the anti-microbial property of spectrum, nano-TiO2It is added in thin-film material, on the one hand, nanometer
TiO 2 particles can be slowly released from film, played anti-microbial property and on the other hand mixed nano-TiO into film2
Can effectively blocking oxygen from film side through the other side, nano-TiO2Addition assign film excellent oxygen barrier property,
The growth of aerobic class bacterium can greatly be inhibited；Film makes film be provided with good anti-oxidant energy by combining tea polyphenols
Power enhances fungistatic effect in terms of anti-oxidant；
The present invention is used as plastic film base using polylactic acid (PLA) and poly terephthalic acid tetramethylene adipate (PBAT)
Body, both for biodegradable high polymer, poly terephthalic acid tetramethylene adipate can effective plasticizing polylactic acid, gram
Take the brittle weakness of polylactic acid；By the enhancing of modified plant fibers, so that PLA material bending modulus increases substantially, enhancing
Compound Material Engineering characteristic and heat-proof quality；By the addition of micro antibacterial agent, antibacterial agent includes nano-titanium dioxide and tea
Polyphenol, nano-titania particle can be slowly released from film, play anti-microbial property, film by combine tea polyphenols,
So that film is provided with good oxidation resistance, enhances fungistatic effect in terms of anti-oxidant；Processing technology of the invention is simple, former
Expect it is environmentally protective, process be a kind of biodegradable green, excellent in mechanical performance and with bacteriostasis property every
Thermal plastic film has extensive market application prospect.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with embodiment, it is clear that described reality
Applying example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is general
Logical technical staff all other embodiment obtained without creative efforts belongs to what the present invention protected
Range.
A kind of environment protection type heat insulating plastic film, is made of the raw material of following parts by weight: 30-40 parts of polylactic acid (PLA), poly- pair
20-30 parts of phthalic acid tetramethylene adipate (PBAT), 4-6 parts of glycerol, 8-12 parts of modified plant fibers, 1-2 parts of antibacterial agent,
60-80 parts of chloroform；
The antibacterial agent is prepared by the following method:
1) it weighs 1.5g tea polyphenols to be added in 200mL dehydrated alcohol, stirring makes it completely dissolved；
2) 3.6g polyethylene glycol is added into above-mentioned solution again, continues after stirring 15-20min, 0.8g nano-silica is added
Change titanium, antibacterial agent is made in room temperature ultrasound 30min；
Polyethylene glycol can be attached to nano-titania particle surface, make nano-TiO2It is dispersed in thin-film material
In, nano-titanium dioxide has excellent chemical stability, also with the anti-microbial property of spectrum, nano-TiO2Thin-film material is added
In, on the one hand, nano-titania particle can be slowly released from film, anti-microbial property be played, on the other hand, to film
Middle incorporation nano-TiO2Can effectively blocking oxygen from film side through the other side, nano-TiO2Addition assign film it is excellent
Oxygen barrier property can greatly inhibit the growth of aerobic class bacterium；Film is provided with film good by combining tea polyphenols
Good oxidation resistance enhances fungistatic effect in terms of anti-oxidant；
The modified plant fibers are prepared by the following method:
1) plant fiber is chopped as 8-12cm segment, being soaked in concentration according to solid-to-liquid ratio 1g:20-30mL is 15g/L's
In NaOH solution, 48h is impregnated at room temperature, is washed to filtrate pH to neutrality, 80 DEG C of drying with a large amount of deionized waters after taking-up；
2) item for being 85s in moisture content 12%, steam explosion pressure 1.85MPa, dimension pressure time by above-mentioned processed fiber
Steam explosion under part is then washed with deionized to filtrate pH to neutrality, and 80 DEG C dry；
3) will be fiber bleached after above-mentioned steam explosion, solid-to-liquid ratio 1:15, bleaching liquid contains 1% Na2SiO3, 2% NaOH,
1% H2O2, 60 DEG C are washed to neutrality after processing 3 hours, 80 DEG C of drying；
4) fiber after drying is heat-treated at 145 DEG C 14min, then will be heat-treated according to solid-liquid ratio 1g:10-13mL
Fiber afterwards is added in deionized water, and ice-water bath ultrasonic disperse 3 times, each 10min obtains fiber water slurry；
5) polyethylene glycol is dissolved in deionized water, is configured to the Aqueous Solutions of Polyethylene Glycol that mass fraction is 20%, according to
Fiber water slurry is poured slowly into Aqueous Solutions of Polyethylene Glycol by volume ratio 1:5, and magnetic force Jiao mixes 2h at room temperature, then at 90 DEG C of water-baths
Aqueous solvent is evaporated in middle stirring, reduces 2/3-5/6 to solvent, is transferred to 60 DEG C of vacuum ovens and stays overnight, improved plant is made
Fiber；
Wherein, plant fiber is ramie, hemp, sisal hemp, abaca, kapok or cocoanut fiber；
Pre- alkali process is good to the degumming effect of plant fiber, and during dipping by lye, hemicellulose can be in the presence of alkali
Deacetylate, and then generate sodium acetate and dissolve, cause cell wall and intercellular layer surface to gradually form hole, increases hydration and make
With, be conducive to improve steam blasting treatment effect；For plant fiber after steam-explosion, steam explosion processing makes hemicellulose and wooden
Element hydrolysis, residual gum content and residual lignin are minimum, respectively 3.62%-3.88% and 5.25%-5.64%, fibre crystallinity and heat
Stability increases, and fibre bundle is disintegrated and separated after degumming, and fragment occurs in fiber surface, while fiber-reactive region increases,
Improve the subsequent modification performance of fiber；Heat treatment can reduce the polarity of plant fiber, improve fiber and basis material
Interfacial adhesion performance is modified the fiber after heat treatment by polyethylene glycol, and polyethylene glycol can be with the hydroxyl of fiber surface
Isoreactivity group reacts, and is coated on fiber surface, and polyethylene glycol can be fully compatible with polylactic acid, is coated with polyethylene glycol
Fiber can be better dispersed in polylactic acid, and when composite material generates bending deformation, the excellent tensile characteristics of plant fiber slow down
The elongation strain of composite material lower, the addition of plant fiber is so that PLA material bending modulus increases substantially；Plant fiber
By modified, composite material section defect is reduced, the enhancing of two-phase compatibility, and obtained plastic film compactness enhancing can have
Effect improves the heat-proof quality of plastic film；
The processing technology of the environment protection type heat insulating plastic film, includes the following steps:
Step S1, first that polylactic acid and poly terephthalic acid tetramethylene adipate is dry in 60 DEG C of vacuum drying oven
8h (in order to avoid hydrolytic degradation), drying are placed in double screw extruder, and glycerol is added, uses double screw extruder (major diameter
Than being squeezed out in 190 DEG C, charging rate 100g/min for 32:1, screw diameter 20mm, revolving speed 100rpm) extruding pelletization；
Step S2, plastics basal granule obtained above is put into 70 DEG C of vacuum drying oven dry 6-7h, 2/3 trichlorine is added
In methane, magnetic agitation obtains plastics basal granule solution to being completely dissolved at room temperature；
Step S3, modified plant fibers are added into remaining 1/3 chloroform, homogeneous 15min, obtain modified plant
Fibres suspension；
Step S4, modified plant fibers suspension and antibacterial agent are slowly added in plastics basal granule solution, first magnetic agitation
10h is mixed them thoroughly, then is placed in ultrasound 30min in ice-water bath and is made each mutually evenly dispersed, and mixed liquor is obtained；
Step S5, mixed liquor is poured into glass culture dish, volatilization for 24 hours, is then placed in 60 DEG C of vacuum and dries naturally at room temperature
Dry 12h takes off film to completely remove solvent to get the plastic film for being 55-65um to average thickness in case after taking-up；
Poly terephthalic acid tetramethylene adipate (PBAT) is petroleum base polyester but has complete biocompatibility
Copolymer has high ductibility, and low elasticity modulus can effective plasticizing polylactic acid (PLA)；Glycerol serves as the work of chain extender
With glycerol is blended with PLA and PBAT, the compatibility of blend polymer can be improved and increased between matrix and dispersed phase
Interface adhesiveness makes PLA, chemically reacts between the macromolecular chain and glycerol of PBAT, cavity is formed, as caused by Voiding
Gap between layer shows good Interface Adhesion between PLA and PBAT, shows plastic film obtained good tough
Property.
Embodiment 1
A kind of environment protection type heat insulating plastic film, is made of the raw material of following parts by weight: 30 parts of polylactic acid (PLA) is gathered to benzene
20 parts of dioctyl phthalate tetramethylene adipate (PBAT), 4 parts of glycerol, 8 parts of modified plant fibers, 1 part of antibacterial agent, chloroform 60
Part；
The environment protection type heat insulating plastic film is process by following steps:
Step S1, first that polylactic acid and poly terephthalic acid tetramethylene adipate is dry in 60 DEG C of vacuum drying oven
8h (in order to avoid hydrolytic degradation), drying are placed in double screw extruder, and glycerol is added, uses double screw extruder (major diameter
Than being squeezed out in 190 DEG C, charging rate 100g/min for 32:1, screw diameter 20mm, revolving speed 100rpm) extruding pelletization；
Step S2, plastics basal granule obtained above is put into 70 DEG C of vacuum drying oven dry 6h, 2/3 three chloromethanes is added
In alkane, magnetic agitation obtains plastics basal granule solution to being completely dissolved at room temperature；
Step S3, modified plant fibers are added into remaining 1/3 chloroform, homogeneous 15min, obtain modified plant
Fibres suspension；
Step S4, modified plant fibers suspension and antibacterial agent are slowly added in plastics basal granule solution, first magnetic agitation
10h is mixed them thoroughly, then is placed in ultrasound 30min in ice-water bath and is made each mutually evenly dispersed, and mixed liquor is obtained；
Step S5, mixed liquor is poured into glass culture dish, volatilization for 24 hours, is then placed in 60 DEG C of vacuum and dries naturally at room temperature
Dry 12h takes off film to completely remove solvent to get the plastic film for being 55-65um to average thickness in case after taking-up.
Embodiment 2
A kind of environment protection type heat insulating plastic film, is made of the raw material of following parts by weight: 35 parts of polylactic acid (PLA) is gathered to benzene
25 parts of dioctyl phthalate tetramethylene adipate (PBAT), 5 parts of glycerol, 10 parts of modified plant fibers, 1.5 parts of antibacterial agent, chloroform
70 parts；
The environment protection type heat insulating plastic film is process by following steps:
Step S1, first that polylactic acid and poly terephthalic acid tetramethylene adipate is dry in 60 DEG C of vacuum drying oven
8h (in order to avoid hydrolytic degradation), drying are placed in double screw extruder, and glycerol is added, uses double screw extruder (major diameter
Than being squeezed out in 190 DEG C, charging rate 100g/min for 32:1, screw diameter 20mm, revolving speed 100rpm) extruding pelletization；
Step S2, plastics basal granule obtained above is put into 70 DEG C of vacuum drying oven dry 6.5h, 2/3 trichlorine is added
In methane, magnetic agitation obtains plastics basal granule solution to being completely dissolved at room temperature；
Step S3, modified plant fibers are added into remaining 1/3 chloroform, homogeneous 15min, obtain modified plant
Fibres suspension；
Step S4, modified plant fibers suspension and antibacterial agent are slowly added in plastics basal granule solution, first magnetic agitation
10h is mixed them thoroughly, then is placed in ultrasound 30min in ice-water bath and is made each mutually evenly dispersed, and mixed liquor is obtained；
Step S5, mixed liquor is poured into glass culture dish, volatilization for 24 hours, is then placed in 60 DEG C of vacuum and dries naturally at room temperature
Dry 12h takes off film to completely remove solvent to get the plastic film for being 55-65um to average thickness in case after taking-up.
Embodiment 3
A kind of environment protection type heat insulating plastic film, is made of the raw material of following parts by weight: 40 parts of polylactic acid (PLA) is gathered to benzene
30 parts of dioctyl phthalate tetramethylene adipate (PBAT), 6 parts of glycerol, 8-12 parts of modified plant fibers, 2 parts of antibacterial agent, chloroform
80 parts；
The environment protection type heat insulating plastic film is process by following steps:
Step S1, first that polylactic acid and poly terephthalic acid tetramethylene adipate is dry in 60 DEG C of vacuum drying oven
8h (in order to avoid hydrolytic degradation), drying are placed in double screw extruder, and glycerol is added, uses double screw extruder (major diameter
Than being squeezed out in 190 DEG C, charging rate 100g/min for 32:1, screw diameter 20mm, revolving speed 100rpm) extruding pelletization；
Step S2, plastics basal granule obtained above is put into 70 DEG C of vacuum drying oven dry 7h, 2/3 three chloromethanes is added
In alkane, magnetic agitation obtains plastics basal granule solution to being completely dissolved at room temperature；
Step S3, modified plant fibers are added into remaining 1/3 chloroform, homogeneous 15min, obtain modified plant
Fibres suspension；
Step S4, modified plant fibers suspension and antibacterial agent are slowly added in plastics basal granule solution, first magnetic agitation
10h is mixed them thoroughly, then is placed in ultrasound 30min in ice-water bath and is made each mutually evenly dispersed, and mixed liquor is obtained；
Step S5, mixed liquor is poured into glass culture dish, volatilization for 24 hours, is then placed in 60 DEG C of vacuum and dries naturally at room temperature
Dry 12h takes off film to completely remove solvent to get the plastic film for being 55-65um to average thickness in case after taking-up.
Following performance test is done to the embodiment 1-3 plastic film being prepared and PLA film:
(1) mechanical property: tensile strength and elongation at break test are according to GB/T1040.3-2006 standard, using electronics
Universal testing machine is tested, test result is as follows table:
| Embodiment 1 | Embodiment 2 | Embodiment 3 | PLA film | |
| Tensile strength/MPa | 43.2 | 43.1 | 43.4 | 31.1 |
| Elongation at break/% | 5.1 | 5.2 | 5.2 | 3.0 |
It is found that the tensile strength for the plastic film that the present invention is prepared is 43.1-43.4MPa, elongation at break is
5.1-5.2%, compared to PLA film, the plastic film that the present invention is prepared has good mechanical property；
(2) biological degradability: according to GB/T19811-2005, " in the case where defining Composting pilot plant conditions, plastic material is disintegrated journey
The measurement of degree " standard, simulation soil buries degradation experiment and tested, and tests the weight-loss ratio (%) of different time, test result is as follows
Table:
| Embodiment 1 | Embodiment 2 | Embodiment 3 | PLA film | |
| 10d | 5.1 | 5.2 | 5.0 | 2.6 |
| 20d | 14.8 | 15.3 | 15.2 | 4.1 |
| 40d | 30.5 | 30.4 | 30.6 | 10.2 |
| 80d | 65.3 | 65.6 | 65.5 | 20.5 |
It is found that the plastic film that the present invention is prepared reaches 5.0% or more, 20d in the degradation rate of 10d and reaches 14.8%
More than, 80d reaches 65.3% or more；Compared to PLA film, the degradation of plastic film speed that the present invention is prepared is fast, has
Good biodegradable.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment
All details are described, are not limited the invention to the specific embodiments described.Obviously, according to the content of this specification,
It can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to better explain the present invention
Principle and practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention is only
It is limited by claims and its full scope and equivalent.
Claims (5)
1. a kind of environment protection type heat insulating plastic film, which is characterized in that be made of the raw material of following parts by weight: 30-40 parts of polylactic acid,
20-30 parts of poly terephthalic acid tetramethylene adipate, 4-6 parts of glycerol, 8-12 parts of modified plant fibers, 1-2 parts of antibacterial agent, three
60-80 parts of chloromethanes；
The environment protection type heat insulating plastic film is made of following steps:
Step S1, polylactic acid and poly terephthalic acid tetramethylene adipate are dried to 8h in 60 DEG C of vacuum drying oven first,
Drying is placed in double screw extruder, and glycerol is added, and using double screw extruder extruding pelletization, is squeezed out in 190 DEG C, charging speed
Degree is 100g/min；
Step S2, plastics basal granule obtained above is put into 70 DEG C of vacuum drying oven dry 6-7h, 2/3 chloroform is added
In, magnetic agitation obtains plastics basal granule solution to being completely dissolved at room temperature；
Step S3, modified plant fibers are added into remaining 1/3 chloroform, homogeneous 15min, obtain improved plant fibre
Tie up suspension；
Step S4, modified plant fibers suspension and antibacterial agent are slowly added in plastics basal granule solution, first magnetic agitation 10h makes
It is sufficiently mixed, then is placed in ultrasound 30min in ice-water bath and makes each mutually evenly dispersed, obtains mixed liquor；
Step S5, mixed liquor is poured into glass culture dish, volatilization for 24 hours, is then placed in 60 DEG C of vacuum drying ovens naturally at room temperature
Dry 12h takes off film to completely remove solvent to get the plastic film for being 55-65um to average thickness after taking-up.
2. a kind of environment protection type heat insulating plastic film according to claim 1, which is characterized in that the antibacterial agent is by such as lower section
Method preparation:
1) it weighs 1.5g tea polyphenols to be added in 200mL dehydrated alcohol, stirring makes it completely dissolved；
2) 3.6g polyethylene glycol is added into above-mentioned solution again, continues after stirring 15-20min, 0.8g nano-titanium dioxide is added,
Antibacterial agent is made in room temperature ultrasound 30min.
3. a kind of environmentally friendly heatpiston's film according to claim 1, which is characterized in that the modified plant fibers are by such as
The preparation of lower section method:
1) plant fiber is chopped as 8-12cm segment, is soaked in the NaOH that concentration is 15g/L according to solid-to-liquid ratio 1g:20-30mL
In solution, 48h is impregnated at room temperature, is washed to filtrate pH to neutrality, 80 DEG C of drying with a large amount of deionized waters after taking-up；
2) by above-mentioned processed fiber under conditions of moisture content 12%, steam explosion pressure 1.85MPa, dimension pressure time are 85s
Steam explosion is then washed with deionized to filtrate pH to neutrality, and 80 DEG C dry；
3) will be fiber bleached after above-mentioned steam explosion, solid-to-liquid ratio 1:15, bleaching liquid contains 1% Na2S iO3, 2% NaOH, 1%
H2O2, 60 DEG C are washed to neutrality after processing 3 hours, 80 DEG C of drying；
4) fiber after drying is heat-treated 14min at 145 DEG C, it then will be after heat treatment according to solid-liquid ratio 1g:10-13mL
Fiber is added in deionized water, and ice-water bath ultrasonic disperse 3 times, each 10min obtains fiber water slurry；
5) polyethylene glycol is dissolved in deionized water, the Aqueous Solutions of Polyethylene Glycol that mass fraction is 20% is configured to, according to volume
Fiber water slurry is poured slowly into Aqueous Solutions of Polyethylene Glycol than 1:5, magnetic force Jiao mixes 2h at room temperature, stirs in 90 DEG C of water-baths
Evaporation aqueous solvent is mixed, reduces 2/3-5/6 to solvent, 60 DEG C of vacuum ovens is transferred to and stays overnight, modified plant fibers are made；
Wherein, plant fiber is ramie, hemp, sisal hemp, abaca, kapok or cocoanut fiber.
4. a kind of preparation process of environment protection type heat insulating plastic film, which comprises the steps of:
Step S1, polylactic acid and poly terephthalic acid tetramethylene adipate are dried to 8h in 60 DEG C of vacuum drying oven first,
Drying is placed in double screw extruder, and glycerol is added, and using double screw extruder extruding pelletization, is squeezed out in 190 DEG C, charging speed
Degree is 100g/min；
Step S2, plastics basal granule obtained above is put into 70 DEG C of vacuum drying oven dry 6-7h, 2/3 chloroform is added
In, magnetic agitation obtains plastics basal granule solution to being completely dissolved at room temperature；
Step S3, modified plant fibers are added into remaining 1/3 chloroform, homogeneous 15min, obtain improved plant fibre
Tie up suspension；
Step S4, modified plant fibers suspension and antibacterial agent are slowly added in plastics basal granule solution, first magnetic agitation 10h makes
It is sufficiently mixed, then is placed in ultrasound 30min in ice-water bath and makes each mutually evenly dispersed, obtains mixed liquor；
Step S5, mixed liquor is poured into glass culture dish, volatilization for 24 hours, is then placed in 60 DEG C of vacuum drying ovens naturally at room temperature
Dry 12h takes off film to completely remove solvent to get the plastic film for being 55-65um to average thickness after taking-up.
5. a kind of preparation process of environment protection type heat insulating plastic film according to claim 4, which is characterized in that in step S1
The draw ratio of the double screw extruder is 32:1, screw diameter 20mm, revolving speed 100rpm.
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