CN104212136A - Polylactic acid anti-bacterial-activity packaging material and preparation method thereof - Google Patents
Polylactic acid anti-bacterial-activity packaging material and preparation method thereof Download PDFInfo
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- CN104212136A CN104212136A CN201410352621.6A CN201410352621A CN104212136A CN 104212136 A CN104212136 A CN 104212136A CN 201410352621 A CN201410352621 A CN 201410352621A CN 104212136 A CN104212136 A CN 104212136A
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- 229920000747 poly(lactic acid) Polymers 0.000 title claims abstract description 68
- 230000000844 anti-bacterial effect Effects 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000005022 packaging material Substances 0.000 title abstract description 7
- 239000004626 polylactic acid Substances 0.000 title abstract 5
- 239000000463 material Substances 0.000 claims abstract description 60
- 239000000341 volatile oil Substances 0.000 claims abstract description 43
- 241000196324 Embryophyta Species 0.000 claims abstract description 20
- 244000223760 Cinnamomum zeylanicum Species 0.000 claims abstract description 8
- 240000004784 Cymbopogon citratus Species 0.000 claims abstract description 8
- 235000017897 Cymbopogon citratus Nutrition 0.000 claims abstract description 8
- 235000017803 cinnamon Nutrition 0.000 claims abstract description 8
- 239000011159 matrix material Substances 0.000 claims abstract description 8
- 239000011347 resin Substances 0.000 claims abstract description 7
- 229920005989 resin Polymers 0.000 claims abstract description 7
- 240000006927 Foeniculum vulgare Species 0.000 claims abstract description 6
- 235000004204 Foeniculum vulgare Nutrition 0.000 claims abstract description 6
- -1 poly(lactic acid) Polymers 0.000 claims description 128
- 230000000845 anti-microbial effect Effects 0.000 claims description 36
- 238000010438 heat treatment Methods 0.000 claims description 24
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000003921 oil Substances 0.000 claims description 7
- 239000010678 thyme oil Substances 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 239000010634 clove oil Substances 0.000 claims description 6
- 238000005469 granulation Methods 0.000 claims description 6
- 230000003179 granulation Effects 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000001291 vacuum drying Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 abstract description 4
- 229920002521 macromolecule Polymers 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 abstract description 2
- 229920000166 polytrimethylene carbonate Polymers 0.000 abstract 2
- 235000010677 Origanum vulgare Nutrition 0.000 abstract 1
- 240000007673 Origanum vulgare Species 0.000 abstract 1
- 244000223014 Syzygium aromaticum Species 0.000 abstract 1
- 235000016639 Syzygium aromaticum Nutrition 0.000 abstract 1
- 240000002657 Thymus vulgaris Species 0.000 abstract 1
- 235000007303 Thymus vulgaris Nutrition 0.000 abstract 1
- 238000010096 film blowing Methods 0.000 abstract 1
- 239000004615 ingredient Substances 0.000 abstract 1
- 239000001585 thymus vulgaris Substances 0.000 abstract 1
- 235000013305 food Nutrition 0.000 description 10
- 229920006381 polylactic acid film Polymers 0.000 description 8
- 229920003023 plastic Polymers 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 241000191967 Staphylococcus aureus Species 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
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- 235000014655 lactic acid Nutrition 0.000 description 2
- 239000004310 lactic acid Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007151 ring opening polymerisation reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 240000003183 Manihot esculenta Species 0.000 description 1
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 244000098338 Triticum aestivum Species 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
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- 238000000605 extraction Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000000968 intestinal effect Effects 0.000 description 1
- JJTUDXZGHPGLLC-UHFFFAOYSA-N lactide Chemical group CC1OC(=O)C(C)OC1=O JJTUDXZGHPGLLC-UHFFFAOYSA-N 0.000 description 1
- 239000012567 medical material Substances 0.000 description 1
- 238000002074 melt spinning Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 239000000622 polydioxanone Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- YFHICDDUDORKJB-UHFFFAOYSA-N trimethylene carbonate Chemical compound O=C1OCCCO1 YFHICDDUDORKJB-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Biological Depolymerization Polymers (AREA)
Abstract
The invention discloses a polylactic acid anti-bacterial-activity packaging material and a preparation method thereof and belongs to the technical field of macromolecule. The anti-bacterial-activity packaging material includes, in a blending manner, a matrix resin and natural anti-bacterial plant essential oil, wherein the matrix resin accounts 100 parts by weight and the natural anti-bacterial plant essential oil accounts 2-10 parts by weight. The matrix resin is blended by polylactic acid and polytrimethylenecarbonate with a weight ratio of the polylactic acid to the polytrimethylenecarbonate being (60-90):(40-10). The natural anti-bacterial plant essential oil includes clove essential oil, cinnamon essential oil, fennel essential oil and lemongrass essential oil, thyme essential oil or origanum vulgare essential oil. The ingredients are blended in a double-screw extruder and are prepared into the novel polylactic acid anti-bacterial-activity packaging material through a film blowing machine. The material has a certain tensile strength and a certain elongation at break, can be biologically degraded completely, has an excellent anti-bacterial activity and can be widely applied in the field of packaging.
Description
Technical field
The present invention relates to a kind of poly(lactic acid) anti-microbial activity wrapping material and preparation method thereof, belong to technical field of macromolecules.
Background technology
Current, in food-processing industry at home and abroad, most food is all the form circulation market by packaging.At present, chemosynthesis plastics are widely used in food product pack and fresh-keeping with its low price, stable in properties, excellent barrier, thermotolerance etc.But, the fast development of plastics industry and product amount increase considerably with serving serious problem: one is great majority all can not environment degradable for the material of food product pack, result in day by day serious problem of environmental pollution; Two are raw materials (as polyethylene, polypropylene, polyvinyl chloride, polystyrene etc.) of existing plastics is Nonrenewable resources---oil, its whole world reserves will face exhaustion greatly after 40 years, be that the plastics industry of raw material also will face the situation of shortage of raw materials with oil.
Several Biodegradable material in prior art, comprises the materials such as poly(lactic acid), PTMC and poly-dioxanone.Poly(lactic acid) is a kind of biodegradable new polyester material, it mainly with starch such as corn, wheat, cassavas for raw material, after lactobacillus-fermented, become lactic acid, then through being polymerized.In addition, poly(lactic acid) has optical activity, tacticity is good, certain degree of crystallinity and higher fusing point, the advantages such as mechanical strength is better.Poly(lactic acid) is a kind of thermoplastic polymer, can carry out extruding in traditional plastics machinery, injection moulding, bottle blowing, the forming process such as thermoforming and melt-spinning, produce heat product and the injecting products such as film, sheet material, bottle.Poly(lactic acid) has extraordinary mechanical property, and main manifestations is for firm and crisp, but its fragility limits the subject matter of poly(lactic acid) in food packaging industry widespread use at present.The second-order transition temperature of PTMC and melt temperature, far below poly(lactic acid), have excellent kindliness, processibility, biocompatibility and biological degradability, are widely used in totally biodegradable environment-friendly materials and medical material at present.Poly(lactic acid)/PTMC blend effectively can improve the mechanical property of poly(lactic acid) packing film.
Traditional high obstructing performance Freshkeeping Packaging form, although blocked the impact of external environment on product, cannot delay the biochemical change of internal product.Along with people are to food safety, the improving constantly of organoleptic property and Food Quality, the active packing of food arises at the historic moment.Wherein, anti-bacterial packaging film is the one of Active Packaging Materials, it mainly with natural macromolecular material for carrier, add certain antiseptic-germicide and the film made.Plants essential oil is the distinctive aromatoising substance of extraction plant, is taken from herbaceous plant and extract with distillation, squeezing mode.Wherein, clove oil, cinnamon essential oil, fennel essential oil, lemongrass essential oil, thyme oil or Herba Origani Vulgaris quintessence oil have good anti-microbial activity, are natural antibacterial agents.
Although domestic and international many scholars describe the preparation about poly(lactic acid) anti-microbial activity wrapping material, but do not mention with poly(lactic acid)/PTMC intermingling material as base material, add natural antibacterial plants essential oil, preparation has the research of the food anti-microbial activity wrapping material of anti-microbial activity and excellent mechanical property.
Summary of the invention
In order to solve the weak point of current anti-microbial activity wrapping material, the object of the present invention is to provide that a kind of anti-microbial activity is high, good mechanical performance, can the novel poly(lactic acid) anti-microbial activity wrapping material of complete biodegradable, described poly(lactic acid) anti-microbial activity wrapping material prepare by following component is blended: matrix resin 100 weight part, natural antibacterial plants essential oil 2 ~ 10 weight part.
Matrix resin of the present invention is the blend of poly(lactic acid) and PTMC, and the weight ratio of poly(lactic acid) and PTMC is 6:4 ~ 9:1.
Antibacterial plant essential oil of the present invention is the one in clove oil, cinnamon essential oil, fennel essential oil, lemongrass essential oil, thyme oil, Herba Origani Vulgaris quintessence oil.
Another object of the present invention is to the preparation method that described poly(lactic acid) anti-microbial activity wrapping material are provided, specifically comprise the following steps:
(1) 0.02% is less than to water content after poly(lactic acid) and PTMC being dried, for subsequent use;
(2) from first material mouth charging of twin screw extruder after the poly(lactic acid) obtained in step (1), PTMC being mixed, carry through screw rod transmission section, after poly(lactic acid), PTMC preheating temperature reach 150 DEG C, add antibacterial plant essential oil from next one material mouth;
(3) be cut into tablets press the particle that length is 0.20 ~ 0.25cm after cooling, after 50 ~ 70 DEG C of vacuum-dryings, for subsequent use;
(4) poly(lactic acid) anti-microbial activity wrapping material are obtained by after the particle inflation film manufacturing machine blown film after granulation.
Twin screw extruder described in step of the present invention (2) adopts the mode of multistage temperature control, first Heating Zone Temperature is 150 ~ 155 DEG C, second Heating Zone Temperature is 160 ~ 165 DEG C, 3rd Heating Zone Temperature is 170 ~ 175 DEG C, 4th Heating Zone Temperature is 160 ~ 165 DEG C, and it is 160 ~ 165 DEG C that antibacterial plant essential oil adds temperature.
Described in step of the present invention (4), the temperature of inflation film manufacturing machine controls at 160 ~ 165 DEG C, and wind chill temperatures is 20 ~ 25 DEG C, and blow-up ratio is 2:1 ~ 4:1, and draw ratio controls as 5:1 ~ 10:1, and the thickness of poly(lactic acid) anti-microbial activity wrapping material is 20 ~ 200 μm.
Poly(lactic acid) of the present invention is commercially available or is obtained through polycondensation or rac-Lactide ring-opening polymerization by lactic acid, and its weight-average molecular weight is 10 ~ 300,000, and water content is less than 0.02%.
PTMC of the present invention is commercially available or is prepared by ring-opening polymerization by trimethylene carbonate, and its weight-average molecular weight is 10 ~ 200,000, and water content is less than 0.02%.
Compared with prior art, tool has the following advantages in the present invention:
(1) material that the present invention obtains has good processing characteristics, can carry out extruding, blown film in traditional plastics machinery;
(2) present invention improves over the complete processing of poly(lactic acid)/PTMC intermingling material, the temperature of antibacterial plant essential oil adition process is made to control at 160 ~ 165 DEG C, effectively prevent the too high impact on antiseptic-germicide activity of processing temperature, ensure the anti-microbial activity of material;
(3) the anti-microbial activity wrapping material that prepared by the present invention have good tensile strength, elongation at break, found by test, tensile strength of material is 11 ~ 27MPa, elongation at break is 120 ~ 200%, wherein, adding of antibacterial plant essential oil, play good plastification, greatly improve the mechanical property of wrapping material; Compared with poly(lactic acid)/PTMC intermingling material, the tensile strength adding the matrix material of plants essential oil reduces 20-60%, and elongation at break improves 25-50%, and can meet the requirement of some packaging materials for food, range of application is more extensive;
(4) the anti-microbial activity wrapping material that prepared by the present invention have certain anti-microbial property, found by test, the antibacterial plant essential oil that the present invention selects comprises clove oil, cinnamon essential oil, fennel essential oil, lemongrass essential oil, thyme oil or Herba Origani Vulgaris quintessence oil, after adding polymer blending material, there is good restraining effect to intestinal bacteria and streptococcus aureus;
(5) this preparation method technique is simple, easy to operate, used poly(lactic acid) and PTMC are Biodegradable material, antibacterial plant essential oil comprises clove oil, cinnamon essential oil, fennel essential oil, lemongrass essential oil, thyme oil or Herba Origani Vulgaris quintessence oil are that crude substance processing comes, this Active Packaging Materials has certain antibacterial effect, and the preservation of food can be directly used in, can biological degradation, environmental protection, fundamentally solve petroleum resources shortage and the environmental problem that causes of white pollution, in particular to a kind of, there is certain tensile strength, elongation at break, there is anti-microbial activity, the novel poly(lactic acid) anti-microbial activity wrapping material of complete biodegradable.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but scope is not limited to described content.
Embodiment 1
(1) in mass ratio for the ratio of 9:1 poly(lactic acid) and PTMC are mixed after in vacuum drying oven dry 10 hours;
(2) get obtain in step (1) poly(lactic acid), PTMC 100 weight part is from the charging of first of twin screw extruder material mouth, carry through screw rod transmission section, after poly(lactic acid), PTMC preheating temperature reach 150 DEG C, the clove oil of 2 weight parts is added from next one material mouth, wherein, twin screw extruder condition is: the first Heating Zone Temperature is 150 DEG C, second Heating Zone Temperature is 160 DEG C, 3rd Heating Zone Temperature is 170 DEG C, and the 4th Heating Zone Temperature is 160 DEG C;
(3), after granulation, add the poly(lactic acid) anti-microbial activity wrapping material that inflation film manufacturing machine blown film is obtained, blown film at 160 DEG C, blow-up ratio 2:1, draw ratio is 5:1, and wind chill temperatures is 20 DEG C;
The poly(lactic acid) anti-microbial activity wrapping material tensile strength that the present embodiment prepares is 27MPa, elongation at break is 120%, obtained antibacterial polylactic acid film is carried out antibacterial experiment, result shows, this antibacterial polylactic acid film for colibacillary bacteriostasis rate more than 80%, for the bacteriostasis rate of streptococcus aureus more than 70%.
Embodiment 2:
(1) in mass ratio for the ratio of 8:2 poly(lactic acid) and PTMC are mixed after in vacuum drying oven dry 10 hours;
(2) get obtain in step (1) poly(lactic acid), PTMC 100 weight part is from the charging of first of twin screw extruder material mouth, carry through screw rod transmission section, after poly(lactic acid), PTMC preheating temperature reach 150 DEG C, the cinnamon essential oil of 5 weight parts is added from next one material mouth, cinnamon essential oil and polymeric blends are disperseed under shear action, wherein, first Heating Zone Temperature is 152 DEG C, second Heating Zone Temperature is 162 DEG C, 3rd Heating Zone Temperature is 172 DEG C, and the 4th Heating Zone Temperature is 162 DEG C;
(2), after granulation, add the poly(lactic acid) anti-microbial activity wrapping material that inflation film manufacturing machine blown film is obtained, blown film at 162 DEG C, blow-up ratio 3:1, draw ratio is 7:1, and wind chill temperatures is 22 DEG C.
The poly(lactic acid) anti-microbial activity wrapping material tensile strength that the present embodiment prepares is 22MPa, elongation at break is 170%, obtained antibacterial polylactic acid film is carried out antibacterial experiment, result shows, this antibacterial polylactic acid film for colibacillary bacteriostasis rate more than 90%, for the bacteriostasis rate of streptococcus aureus more than 70%.
Embodiment 3:
(1) in mass ratio for the ratio of 7:3 poly(lactic acid) and PTMC are mixed after in vacuum drying oven dry 10 hours;
(2) poly(lactic acid) obtained in step (1) is got, PTMC 100 weight part is from first material mouth charging of twin screw extruder, carry through screw rod transmission section, treat poly(lactic acid), after PTMC preheating temperature reaches 150 DEG C, the lemongrass essential oil of 10 weight parts is added from next one material mouth, lemongrass essential oil and polymeric blends are disperseed under shear action, wherein, twin screw extruder condition is: the first Heating Zone Temperature is 150 DEG C, second Heating Zone Temperature is 160 DEG C, 3rd Heating Zone Temperature is 170 DEG C, 4th Heating Zone Temperature is 160 DEG C,
(3), after granulation, add the poly(lactic acid) anti-microbial activity wrapping material that inflation film manufacturing machine blown film is obtained, blown film at 160 DEG C, blow-up ratio 4:1, draw ratio is 5:1, and wind chill temperatures is 25 DEG C.
The poly(lactic acid) anti-microbial activity wrapping material tensile strength that the present embodiment prepares is 15MPa, elongation at break is 160%, obtained antibacterial polylactic acid film is carried out antibacterial experiment, result shows, this antibacterial polylactic acid film for colibacillary bacteriostasis rate more than 95%, for the bacteriostasis rate of streptococcus aureus more than 90%.
Embodiment 4
(1) in mass ratio for the ratio of 6:4 poly(lactic acid) and PTMC are mixed after in vacuum drying oven dry 10 hours;
(2) poly(lactic acid) obtained in step (1) is got, PTMC 100 weight part is from first material mouth charging of twin screw extruder, carry through screw rod transmission section, treat poly(lactic acid), after PTMC preheating temperature reaches 150 DEG C, the thyme oil of 2 weight parts is added from next one material mouth, thyme oil and polymeric blends are disperseed under shear action, wherein, twin screw extruder condition is: the first Heating Zone Temperature is 155 DEG C, second Heating Zone Temperature is 165 DEG C, 3rd Heating Zone Temperature is 175 DEG C, 4th Heating Zone Temperature is 165 DEG C,
(3), after granulation, add the poly(lactic acid) anti-microbial activity wrapping material that inflation film manufacturing machine blown film is obtained, blown film at 165 DEG C, blow-up ratio 4:1, draw ratio is 10:1, and wind chill temperatures is 25 DEG C.
The poly(lactic acid) anti-microbial activity wrapping material tensile strength that the present embodiment prepares is 11MPa, and elongation at break is 200%.Obtained antibacterial polylactic acid film is carried out antibacterial experiment, and result shows, this antibacterial polylactic acid film for colibacillary bacteriostasis rate more than 95%, for the bacteriostasis rate of streptococcus aureus more than 85%.
Claims (6)
1. poly(lactic acid) anti-microbial activity wrapping material, is characterized in that: these poly(lactic acid) anti-microbial activity wrapping material prepare by following component is blended: matrix resin 100 weight part, natural antibacterial plants essential oil 2 ~ 10 weight part.
2. poly(lactic acid) anti-microbial activity wrapping material according to claim 1, it is characterized in that: described matrix resin is the blend of poly(lactic acid) and PTMC, the weight ratio of poly(lactic acid) and PTMC is 6:4 ~ 9:1, and wherein, the weight-average molecular weight of poly(lactic acid) is 10 ~ 300,000; The weight-average molecular weight of PTMC is 10 ~ 200,000.
3. poly(lactic acid) anti-microbial activity wrapping material according to claim 1, is characterized in that: described antibacterial plant essential oil is the one in clove oil, cinnamon essential oil, fennel essential oil, lemongrass essential oil, thyme oil, Herba Origani Vulgaris quintessence oil.
4. the preparation method of poly(lactic acid) anti-microbial activity wrapping material according to claim 1, is characterized in that, specifically comprise the following steps:
(1) 0.02% is less than to water content after poly(lactic acid) and PTMC being dried, for subsequent use;
(2) from first material mouth charging of twin screw extruder after the poly(lactic acid) obtained in step (1), PTMC being mixed, carry through screw rod transmission section, after poly(lactic acid), PTMC preheating temperature reach 150 DEG C, add antibacterial plant essential oil from next one material mouth;
(3) be cut into tablets press the particle that length is 0.20 ~ 0.25cm after cooling, after 50 ~ 70 DEG C of vacuum-dryings, for subsequent use;
(4) poly(lactic acid) anti-microbial activity wrapping material are obtained by after the particle inflation film manufacturing machine blown film after granulation.
5. the preparation method of poly(lactic acid) anti-microbial activity wrapping material according to claim 4, it is characterized in that: twin screw extruder described in step (2) adopts the mode of multistage temperature control, first Heating Zone Temperature is 150 ~ 155 DEG C, second Heating Zone Temperature is 160 ~ 165 DEG C, 3rd Heating Zone Temperature is 170 ~ 175 DEG C, 4th Heating Zone Temperature is 160 ~ 165 DEG C, and it is 160 ~ 165 DEG C that antibacterial plant essential oil adds temperature.
6. the preparation method of poly(lactic acid) anti-microbial activity wrapping material according to claim 4, it is characterized in that: described in step (4), the temperature of inflation film manufacturing machine controls at 160 ~ 165 DEG C, wind chill temperatures is 20 ~ 25 DEG C, blow-up ratio is 2:1 ~ 4:1, draw ratio is 5:1 ~ 10:1, and obtained poly(lactic acid) anti-microbial activity wrapping material thickness is 20 ~ 200 μm.
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| CN104859127A (en) * | 2015-04-27 | 2015-08-26 | 安徽松泰包装材料有限公司 | Antibacterial packaging film preparation process |
| CN106336633A (en) * | 2016-08-19 | 2017-01-18 | 王胜利 | Mushroom package bag |
| CN106750811A (en) * | 2016-12-27 | 2017-05-31 | 广西中烟工业有限责任公司 | A kind of antibacterial, anti-oxidant, metal-chelating multifunctional plastic and preparation method thereof |
| CN107627706A (en) * | 2017-09-18 | 2018-01-26 | 上海海洋大学 | Degradable high-barrier active fresh-keeping film and preparation method thereof |
| CN109666282A (en) * | 2019-01-15 | 2019-04-23 | 南通大学 | A kind of antibacterial degradable lactic acid composite material and its disposable syringe of preparation |
| CN110591314A (en) * | 2019-09-23 | 2019-12-20 | 昆明理工大学 | Preparation method of controlled-release antibacterial active polylactic acid packaging film |
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| CN113956505A (en) * | 2021-11-03 | 2022-01-21 | 海南赛诺实业有限公司 | Polylactic acid emulsion, preparation method and application thereof |
| CN113956633A (en) * | 2020-07-21 | 2022-01-21 | 中国农业大学 | Degradable active packaging material based on ginger essential oil and polylactic acid and preparation method thereof |
| CN115726052A (en) * | 2022-11-26 | 2023-03-03 | 上海工程技术大学 | Biodegradable antibacterial fiber, preparation method thereof and fabric prepared from biodegradable antibacterial fiber |
| CN115960446A (en) * | 2022-12-27 | 2023-04-14 | 浙江农林大学 | Preparation method of essential oil/carboxylated nanocellulose/polylactic acid packaging film |
| CN116285274A (en) * | 2023-04-19 | 2023-06-23 | 广州市艾美塑胶软管有限公司 | Double-layer packaging hose for paste cosmetics and preparation method thereof |
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