CN105603812A - Preparation method for polylactic acid composite paper plastic package material - Google Patents
Preparation method for polylactic acid composite paper plastic package material Download PDFInfo
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- CN105603812A CN105603812A CN201510987431.6A CN201510987431A CN105603812A CN 105603812 A CN105603812 A CN 105603812A CN 201510987431 A CN201510987431 A CN 201510987431A CN 105603812 A CN105603812 A CN 105603812A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
-
- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/28—Treatment by wave energy or particle radiation
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/46—Non-macromolecular organic compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/005—Mechanical treatment
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Paper (AREA)
- Wrappers (AREA)
Abstract
The invention discloses a preparation method for a polylactic acid composite paper plastic package material, and belongs to the field of package materials. The preparation method comprises the steps of modifying polylactic acid particles, dissolving modified polylactic acid in a dichloromethane solvent, and adding nano-montmorillonite to obtain polylactic acid emulsion; mixing the polylactic acid emulsion with polyvinyl alcohol, pouring a mixture into an ozone reaction tower, and adding an additive to perform mixing to obtain a coating liquid; coating a paper-based material with the coating liquid by a bar; and performing hot-press treatment to obtain the composite paper plastic package material. According to the preparation method, a preparation process is environment-friendly; and the prepared material is safe, nontoxic, excellent in mechanical property and biodegradable, has excellent transparency and bacterial resistance, and is to become a new-generation environment-friendly and novel macromolecular package material instead of a conventional package material.
Description
Technical field
The invention discloses the preparation method of the compound paper packaging material of a kind of PLA, belong to packaging material field.
Background technology
The synthetic of PLA is taking starch such as corn, wheat or cassavas as raw material, decomposes and obtains glucose through enzyme, and glucose is transformed into lactic acid after lactobacillus-fermented, and last lactic acid obtains high-purity PLA through chemical synthesis. Oneself becomes the part of people's consumption demand packaging material. Plastics package on market now, common used material mostly is PE, PP, PS and PET etc. First, their raw material all come from petroleum base material, can not biodegradation at occurring in nature, and this not only causes a large amount of sanitary fills, and has caused serious environmental pollution. Poly-lactic acid material, its raw material is the carbohydrate obtaining via the Starch Hydrolysis of green plants extraction, further ferments, and is prepared via polymerisation; Meanwhile, PLA has the multiple degraded modes such as enzyme degraded, microbial degradation and chemical degradation, and post processing can be carried out under field conditions (factors).
As packaging material, paper and cardboard have following characteristics: raw material sources are abundant, price is low; Suitable solidness, resistance to impact and rub resistance; Health, safety; Good folding, formability, is convenient to machining; Good printability; Deep processing; Discarded object is easily processed, biodegradable and recuperability. Therefore,, in environmental problem increasingly serious today, paper and cardboard become first-selected packaging material. But also there are some shortcomings in paper and cardboard: hygroscopicity, strength decreased after making moist; Porous, poor to the barrier of steam, gas and smell; Be difficult to sealing; Not puncture-resistant; The transparency is poor etc. These drawbacks limit paper material application on the packaging, the especially application on some packagings for foodstuff, barrier packaging.
Summary of the invention
The technical problem that the present invention mainly solves: crisp frangible for current poly-lactic acid material matter, elongation is low and impact resistance is poor, and traditional paper wrapper make moist after strength decreased, to steam, the barrier of gas and smell is poor, be difficult to sealing, the problem of pollution degradation environment voluntarily, the preparation method of the compound paper packaging material of a kind of PLA is provided, PLA particle is carried out modification by the present invention, PLA after modification is dissolved in dichloromethane solvent, and add nano imvite to obtain PLA emulsion, after mixing with polyvinyl alcohol again, pour ozone reaction tower into, add auxiliary agent to be mixed to get coating liquid, coat on paper base material with bar type, carry out hot-pressing processing and obtain compound paper packaging material, preparation process environmental protection of the present invention, the material safety non-toxic of preparing, mechanical performance is good, biodegradable, but also there is the excellent transparency and antibiotic property, by eco-friendly a new generation that becomes replacement Traditional Packing material, novel green packaging macromolecular material.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
(1) get 300～500g PLA pellet and put into vacuum drying chamber, dry 10～12h at 50～70 DEG C, again 20～30g trimethylolpropane triacrylate is dissolved in 1～1.5L acetone, stir with the rotating speed of 400～600r/min with magnetic stirrer, under stirring, add above-mentioned dried PLA pellet, put into fume hood acetone is volatilized completely;
(2) the PLA pellet obtaining after above-mentioned processing is put into torque rheometer melt blending 5～10min, blending temperature is 150～180 DEG C, melting PLA after blend is sealed in glass tube, and suction reaches 900～1000Pa, glass tube level is placed on cobalt source radiation platform, carries out radiation treatment with the close rate of 2～2.5kGy/h;
(3) reach and set after dosage until radiation, take out and put into baking oven immediately, at the temperature of 70～90 DEG C, anneal after 25～35min, continue to be warming up to 100～110 DEG C of insulation reaction 30～40min, make remaining free radical complete deactivation, obtain the PLA after modification;
(4) PLA taking after 20～30g modification is dissolved in 400～500mL carrene, is placed in ultrasonic separating apparatus, adds 3～5g nano imvite, disperses 1～2h with the power ultrasonic of 200～300W, makes PLA emulsion;
(5) 10～20g polyvinyl alcohol is added in 800～900mL distilled water, normal temperature stirs and makes it fully swelling with glass bar after infiltrating 15～25min, be heated to again 80～90 DEG C, continuing to stir dissolves it completely, in fume hood, the above-mentioned PLA emulsion making is slowly dripped in poly-vinyl alcohol solution, stir until carrene volatilizees completely with glass bar, obtain mixed liquor;
(6) above-mentioned mixed liquor is poured in ozone reaction tower, flow velocity with 1L/min passes into ozone, 10～15min after confined reaction, discharging, be in 10% chitosan solution for 2:3 is dissolved in mass concentration by volume, add 0.5～1mL barium stearate and 1～2mL dimethyl silicone polymer, put into the ultrasonic dispersion 10～20min of sonic oscillation instrument, make coating liquid;
(7) coating liquid making is packed in bar type coating machine, be uniformly coated on brown paper surface with the application rate of 3m/min, repeatedly be coated with on the tetrafluoroethene backing plate that is placed on hot press after 3～5 times, carry out after hot-pressing processing 5～10min, obtain the compound paper packaging material of a kind of PLA.
Described hot press parameter is: upper plate temperature is 160～180 DEG C, and lower plate temperature is 130～140 DEG C, and hot pressing pressure is 2～5MPa.
Application process of the present invention: the compound paper packaging material of PLA that the present invention is made can be applied in the packaging of food, when packaging, to check cleannes and the aridity of connection with wrapping of piece, when high pressure steam sterilization, instrument cleaning is not exclusively dry, residual oil and moisture easily soak paper and cause wet bag, the necessary suitable cutting of paper plastic bag, so that removal air, the poisture-penetrability of paper-plastic package material is 101.46～121.12g/m224h, the oxygen permeability of material is 30.54～31.04cm3/m224h0.1MPa, to the good barrier property of steam, gas and smell.
The invention has the beneficial effects as follows:
(1) preparation process environmental protection of the present invention, material safety non-toxic, the mechanical performance prepared are good, biodegradable;
(2) packaging material that prepared by the present invention have the excellent transparency and antibiotic property, will become eco-friendly, the novel green package macromolecular material of a new generation that replaces Traditional Packing material.
Detailed description of the invention
First get 300～500g PLA pellet and put into vacuum drying chamber, dry 10～12h at 50～70 DEG C, again 20～30g trimethylolpropane triacrylate is dissolved in 1～1.5L acetone, stir with the rotating speed of 400～600r/min with magnetic stirrer, under stirring, add above-mentioned dried PLA pellet, put into fume hood acetone is volatilized completely; The PLA pellet obtaining after processing is put into torque rheometer melt blending 5～10min, blending temperature is 150～180 DEG C, melting PLA after blend is sealed in glass tube, and suction reaches 900～1000Pa, glass tube level is placed on cobalt source radiation platform, carries out radiation treatment with the close rate of 2～2.5kGy/h; Reach and set after dosage until radiation, take out and put into baking oven immediately, at the temperature of 70～90 DEG C, anneal after 25～35min, continue to be warming up to 100～110 DEG C of insulation reaction 30～40min, make remaining free radical complete deactivation, obtain the PLA after modification; The PLA taking after 20～30g modification is dissolved in 400～500mL carrene, is placed in ultrasonic separating apparatus, adds 3～5g nano imvite, disperses 1～2h with the power ultrasonic of 200～300W, makes PLA emulsion; 10～20g polyvinyl alcohol is added in 800～900mL distilled water, normal temperature stirs and makes it fully swelling with glass bar after infiltrating 15～25min, be heated to again 80～90 DEG C, continuing to stir dissolves it completely, in fume hood, the above-mentioned PLA emulsion making is slowly dripped in poly-vinyl alcohol solution, stir until carrene volatilizees completely with glass bar, obtain mixed liquor; Mixed liquor is poured in ozone reaction tower, flow velocity with 1L/min passes into ozone, 10～15min after confined reaction, discharging, be in 10% chitosan solution for 2:3 is dissolved in mass concentration by volume, add 0.5～1mL barium stearate and 1～2mL dimethyl silicone polymer, put into the ultrasonic dispersion 10～20min of sonic oscillation instrument, make coating liquid; The coating liquid making is packed in bar type coating machine, be uniformly coated on brown paper surface with the application rate of 3m/min, repeatedly be coated with on the tetrafluoroethene backing plate that is placed on hot press after 3～5 times, carry out after hot-pressing processing 5～10min, obtain the compound paper packaging material of a kind of PLA.
Described hot press parameter is: upper plate temperature is 160～180 DEG C, and lower plate temperature is 130～140 DEG C, and hot pressing pressure is 2～5MPa.
Example 1
First get 300g PLA pellet and put into vacuum drying chamber, dry 10h at 50 DEG C, again 20g trimethylolpropane triacrylate is dissolved in 1L acetone, stir with the rotating speed of 400r/min with magnetic stirrer, under stirring, add above-mentioned dried PLA pellet, put into fume hood acetone is volatilized completely; The PLA pellet obtaining after processing is put into torque rheometer melt blending 5min, blending temperature is 150 DEG C, melting PLA after blend is sealed in glass tube, and suction reaches 900Pa, glass tube level is placed on cobalt source radiation platform, carries out radiation treatment with the close rate of 2kGy/h; Reach and set after dosage until radiation, take out and put into baking oven immediately, at the temperature of 70 DEG C, anneal after 25min, continue to be warming up to 100 DEG C of insulation reaction 30min, make remaining free radical complete deactivation, obtain the PLA after modification; The PLA taking after 20g modification is dissolved in 400mL carrene, is placed in ultrasonic separating apparatus, adds 3g nano imvite, disperses 1h with the power ultrasonic of 200W, makes PLA emulsion; 10g polyvinyl alcohol is added in 800mL distilled water, normal temperature stirs and makes it fully swelling with glass bar after infiltrating 15min, be heated to again 80 DEG C, continuing to stir dissolves it completely, in fume hood, the above-mentioned PLA emulsion making is slowly dripped in poly-vinyl alcohol solution, stir until carrene volatilizees completely with glass bar, obtain mixed liquor; Mixed liquor is poured in ozone reaction tower, flow velocity with 1L/min passes into ozone, 10min after confined reaction, discharging, be in 10% chitosan solution for 2:3 is dissolved in mass concentration by volume, add 0.5mL barium stearate and 1mL dimethyl silicone polymer, put into the ultrasonic dispersion of sonic oscillation instrument 10min, make coating liquid; The coating liquid making is packed in bar type coating machine, be uniformly coated on brown paper surface with the application rate of 3m/min, repeatedly be coated with on the tetrafluoroethene backing plate that is placed on hot press after 3 times, carry out after hot-pressing processing 5min, obtain the compound paper packaging material of a kind of PLA.
Described hot press parameter is: upper plate temperature is 160 DEG C, and lower plate temperature is 130 DEG C, and hot pressing pressure is 2MPa.
The compound paper packaging material of PLA that the present invention is made can be applied in the packaging of food, when packaging, to check cleannes and the aridity of connection with wrapping of piece, when high pressure steam sterilization, instrument cleaning is not exclusively dry, residual oil and moisture easily soak paper and cause wet bag, the necessary suitable cutting of paper plastic bag, so that removal air, the poisture-penetrability of paper-plastic package material is 101.46g/m224h, the oxygen permeability of material is 30.54cm3/m224h0.1MPa, to the good barrier property of steam, gas and smell.
Example 2
First get 400g PLA pellet and put into vacuum drying chamber, dry 11h at 60 DEG C, again 25g trimethylolpropane triacrylate is dissolved in 1.3L acetone, stir with the rotating speed of 500r/min with magnetic stirrer, under stirring, add above-mentioned dried PLA pellet, put into fume hood acetone is volatilized completely; The PLA pellet obtaining after processing is put into torque rheometer melt blending 8min, blending temperature is 175 DEG C, melting PLA after blend is sealed in glass tube, and suction reaches 950Pa, glass tube level is placed on cobalt source radiation platform, carries out radiation treatment with the close rate of 2.3kGy/h; Reach and set after dosage until radiation, take out and put into baking oven immediately, at the temperature of 80 DEG C, anneal after 30min, continue to be warming up to 105 DEG C of insulation reaction 35min, make remaining free radical complete deactivation, obtain the PLA after modification; The PLA taking after 25g modification is dissolved in 450mL carrene, is placed in ultrasonic separating apparatus, adds 4g nano imvite, disperses 1.5h with the power ultrasonic of 250W, makes PLA emulsion; 15g polyvinyl alcohol is added in 850mL distilled water, normal temperature stirs and makes it fully swelling with glass bar after infiltrating 20min, be heated to again 85 DEG C, continuing to stir dissolves it completely, in fume hood, the above-mentioned PLA emulsion making is slowly dripped in poly-vinyl alcohol solution, stir until carrene volatilizees completely with glass bar, obtain mixed liquor; Mixed liquor is poured in ozone reaction tower, flow velocity with 1L/min passes into ozone, 13min after confined reaction, discharging, be in 10% chitosan solution for 2:3 is dissolved in mass concentration by volume, add 0.8mL barium stearate and 1.5mL dimethyl silicone polymer, put into the ultrasonic dispersion of sonic oscillation instrument 15min, make coating liquid; The coating liquid making is packed in bar type coating machine, be uniformly coated on brown paper surface with the application rate of 3m/min, repeatedly be coated with on the tetrafluoroethene backing plate that is placed on hot press after 4 times, carry out after hot-pressing processing 8min, obtain the compound paper packaging material of a kind of PLA.
Described hot press parameter is: upper plate temperature is 170 DEG C, and lower plate temperature is 135 DEG C, and hot pressing pressure is 3.5MPa.
The compound paper packaging material of PLA that the present invention is made can be applied in the packaging of food, when packaging, to check cleannes and the aridity of connection with wrapping of piece, when high pressure steam sterilization, instrument cleaning is not exclusively dry, residual oil and moisture easily soak paper and cause wet bag, the necessary suitable cutting of paper plastic bag, so that removal air, the poisture-penetrability of paper-plastic package material is 116.35g/m224h, the oxygen permeability of material is 30.89cm3/m224h0.1MPa, to the good barrier property of steam, gas and smell.
Example 3
First get 500g PLA pellet and put into vacuum drying chamber, dry 12h at 70 DEG C, again 30g trimethylolpropane triacrylate is dissolved in 1.5L acetone, stir with the rotating speed of 600r/min with magnetic stirrer, under stirring, add above-mentioned dried PLA pellet, put into fume hood acetone is volatilized completely; The PLA pellet obtaining after processing is put into torque rheometer melt blending 10min, blending temperature is 180 DEG C, melting PLA after blend is sealed in glass tube, and suction reaches 1000Pa, glass tube level is placed on cobalt source radiation platform, carries out radiation treatment with the close rate of 2.5kGy/h; Reach and set after dosage until radiation, take out and put into baking oven immediately, at the temperature of 90 DEG C, anneal after 35min, continue to be warming up to 110 DEG C of insulation reaction 40min, make remaining free radical complete deactivation, obtain the PLA after modification; The PLA taking after 30g modification is dissolved in 500mL carrene, is placed in ultrasonic separating apparatus, adds 5g nano imvite, disperses 2h with the power ultrasonic of 300W, makes PLA emulsion; 20g polyvinyl alcohol is added in 900mL distilled water, normal temperature stirs and makes it fully swelling with glass bar after infiltrating 25min, be heated to again 90 DEG C, continuing to stir dissolves it completely, in fume hood, the above-mentioned PLA emulsion making is slowly dripped in poly-vinyl alcohol solution, stir until carrene volatilizees completely with glass bar, obtain mixed liquor; Mixed liquor is poured in ozone reaction tower, flow velocity with 1L/min passes into ozone, 15min after confined reaction, discharging, be in 10% chitosan solution for 2:3 is dissolved in mass concentration by volume, add 1mL barium stearate and 2mL dimethyl silicone polymer, put into the ultrasonic dispersion of sonic oscillation instrument 20min, make coating liquid; The coating liquid making is packed in bar type coating machine, be uniformly coated on brown paper surface with the application rate of 3m/min, repeatedly be coated with on the tetrafluoroethene backing plate that is placed on hot press after 5 times, carry out after hot-pressing processing 10min, obtain the compound paper packaging material of a kind of PLA.
Described hot press parameter is: upper plate temperature is 180 DEG C, and lower plate temperature is 140 DEG C, and hot pressing pressure is 5MPa.
The compound paper packaging material of PLA that the present invention is made can be applied in the packaging of food, when packaging, to check cleannes and the aridity of connection with wrapping of piece, when high pressure steam sterilization, instrument cleaning is not exclusively dry, residual oil and moisture easily soak paper and cause wet bag, the necessary suitable cutting of paper plastic bag, so that removal air, the poisture-penetrability of paper-plastic package material is 121.12g/m224h, the oxygen permeability of material is 31.04cm3/m224h0.1MPa, to the good barrier property of steam, gas and smell.
Claims (2)
1. a preparation method for the compound paper packaging material of PLA, is characterized in that concrete preparation process is:
(1) get 300～500g PLA pellet and put into vacuum drying chamber, dry 10～12h at 50～70 DEG C, again 20～30g trimethylolpropane triacrylate is dissolved in 1～1.5L acetone, stir with the rotating speed of 400～600r/min with magnetic stirrer, under stirring, add above-mentioned dried PLA pellet, put into fume hood acetone is volatilized completely;
(2) the PLA pellet obtaining after above-mentioned processing is put into torque rheometer melt blending 5～10min, blending temperature is 150～180 DEG C, melting PLA after blend is sealed in glass tube, and suction reaches 900～1000Pa, glass tube level is placed on cobalt source radiation platform, carries out radiation treatment with the close rate of 2～2.5kGy/h;
(3) reach and set after dosage until radiation, take out and put into baking oven immediately, at the temperature of 70～90 DEG C, anneal after 25～35min, continue to be warming up to 100～110 DEG C of insulation reaction 30～40min, make remaining free radical complete deactivation, obtain the PLA after modification;
(4) PLA taking after 20～30g modification is dissolved in 400～500mL carrene, is placed in ultrasonic separating apparatus, adds 3～5g nano imvite, disperses 1～2h with the power ultrasonic of 200～300W, makes PLA emulsion;
(5) 10～20g polyvinyl alcohol is added in 800～900mL distilled water, normal temperature stirs and makes it fully swelling with glass bar after infiltrating 15～25min, be heated to again 80～90 DEG C, continuing to stir dissolves it completely, in fume hood, the above-mentioned PLA emulsion making is slowly dripped in poly-vinyl alcohol solution, stir until carrene volatilizees completely with glass bar, obtain mixed liquor;
(6) above-mentioned mixed liquor is poured in ozone reaction tower, flow velocity with 1L/min passes into ozone, 10～15min discharging after confined reaction, be in 10% chitosan solution for 2:3 is dissolved in mass concentration by volume, add 0.5～1mL barium stearate and 1～2mL dimethyl silicone polymer, put into the ultrasonic dispersion 10～20min of sonic oscillation instrument, make coating liquid;
(7) coating liquid making is packed in bar type coating machine, be uniformly coated on brown paper surface with the application rate of 3m/min, repeatedly be coated with on the tetrafluoroethene backing plate that is placed on hot press after 3～5 times, carry out after hot-pressing processing 5～10min, obtain the compound paper packaging material of a kind of PLA.
2. the preparation method of the compound paper packaging material of a kind of PLA according to claim 1, is characterized in that: described hot press parameter is: upper plate temperature is 160～180 DEG C, and lower plate temperature is 130～140 DEG C, and hot pressing pressure is 2～5MPa.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106120394A (en) * | 2016-07-10 | 2016-11-16 | 李金平 | A kind of printing coatings adhesive |
| CN106221160A (en) * | 2016-08-18 | 2016-12-14 | 华南理工大学 | A kind of chitin crystal bar base polylactic acid compound package material of antibiotic property and preparation method thereof |
| CN107698811A (en) * | 2017-10-19 | 2018-02-16 | 桐城市人和包装有限公司 | A kind of degradable composite paper-plastic material |
| CN108912631A (en) * | 2018-06-06 | 2018-11-30 | 安徽顺科包装制品有限公司 | A kind of high leakproofness method for manufacturing thin film for paper and plastics compound bag |
| CN109385057A (en) * | 2018-09-05 | 2019-02-26 | 安徽新翔包装材料有限公司 | A kind of enviroment protective degradable wrapping paper |
| CN113774722A (en) * | 2021-09-06 | 2021-12-10 | 陕西科技大学 | Degradable high-molecular composite paper prepared from pickering emulsion and preparation method thereof |
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| CN106120394A (en) * | 2016-07-10 | 2016-11-16 | 李金平 | A kind of printing coatings adhesive |
| CN106221160A (en) * | 2016-08-18 | 2016-12-14 | 华南理工大学 | A kind of chitin crystal bar base polylactic acid compound package material of antibiotic property and preparation method thereof |
| CN106221160B (en) * | 2016-08-18 | 2018-04-13 | 华南理工大学 | A kind of chitin crystal bar base polylactic acid compound package material of antibiotic property and preparation method thereof |
| CN107698811A (en) * | 2017-10-19 | 2018-02-16 | 桐城市人和包装有限公司 | A kind of degradable composite paper-plastic material |
| CN108912631A (en) * | 2018-06-06 | 2018-11-30 | 安徽顺科包装制品有限公司 | A kind of high leakproofness method for manufacturing thin film for paper and plastics compound bag |
| CN109385057A (en) * | 2018-09-05 | 2019-02-26 | 安徽新翔包装材料有限公司 | A kind of enviroment protective degradable wrapping paper |
| CN113774722A (en) * | 2021-09-06 | 2021-12-10 | 陕西科技大学 | Degradable high-molecular composite paper prepared from pickering emulsion and preparation method thereof |
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