CN112457580B - Environment-friendly breathable anti-condensation PP/PLA/MCC (polypropylene/polylactic acid/MCC) casting fruit and vegetable packaging film and preparation method thereof - Google Patents
Environment-friendly breathable anti-condensation PP/PLA/MCC (polypropylene/polylactic acid/MCC) casting fruit and vegetable packaging film and preparation method thereof Download PDFInfo
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- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
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- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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Abstract
The invention discloses an environment-friendly breathable anti-condensation PP/PLA/MCC casting fruit and vegetable packaging film and a preparation method thereof, wherein the film comprises the following components in percentage by mass: 60-100 parts of PP, 0-40 parts of PLA, 2 parts of MCC, 1 part of polypropylene grafted maleic anhydride, 1-4 parts of polyethylene glycol, 1-2 parts of a coupling agent and 2.1-4.5 parts of an auxiliary agent. The degradable casting film has strong air permeability, high tensile strength and high flexibility, and can be used in the temperature range of-20 ℃ to 65 ℃. The product of the invention has partial degradability and good mechanical property, and can be widely used in the related fields of fruit and vegetable fresh-keeping packaging and the like.
Description
Technical Field
The invention relates to the technical field of cast film production, in particular to an environment-friendly air-permeable anti-condensation PP/PLA/MCC cast fruit and vegetable packaging film and a preparation method thereof.
Background
Fresh fruits are agricultural products with high moisture content, and are easy to continuously absorb moisture and desorb in a circulating environment, so that a dewing phenomenon is caused, nearby fruit tissues are browned and rotten, microbial proliferation is further caused, and the deterioration and the rotting of the fruits in the bag are accelerated. The high-permeability microporous packaging film can effectively improve or control the environmental atmosphere for storing the fruits and the vegetables, can effectively inhibit the condensation phenomenon, can greatly delay the physical and chemical deterioration of the fruits and the vegetables and ensure the quality of the fruits and the vegetables. In order to obtain a gas-permeable film material, this can generally be achieved by a combination of polymers with certain phase separation. On the other hand, with the increasing severity of environmental problems such as white pollution, the preparation of novel biodegradable materials becomes a hotspot of the research in the field of packaging, and the development of environment-friendly packaging materials not only meets the requirements of green and new administration, but also brings great economic and social benefits to national economy.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an environment-friendly breathable moisture condensation prevention PP/PLA/MCC casting fruit and vegetable packaging film with good degradation performance and good mechanical performance and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
an environment-friendly breathable anti-condensation PP/PLA/MCC casting fruit and vegetable packaging film comprises the following components in percentage by mass:
according to the preparation method of the environment-friendly breathable anti-condensation PP/PLA/MCC casting fruit and vegetable packaging film, the PP is HI828, the PLA is Natureworks4032D, the polypropylene grafted maleic anhydride is P613, the coupling agent is a titanate coupling agent, and the MCC is MCC with a nano-grade particle size of 50 nm. The PP-g-MA has the function of adjusting the compatibility of the plastic particles and the microcrystalline cellulose. The molecular weight of the polyethylene glycol is 300-8000Da, preferably 4000-8000Da, and the polyethylene glycol is used as a solubilizer of two plastics.
Preferably, in the environment-friendly breathable moisture condensation prevention PP/PLA/MCC casting fruit and vegetable packaging film, the auxiliary agents are a lubricant and a flexibilizer.
The preparation method of the environment-friendly breathable anti-condensation PP/PLA/MCC casting film comprises the following steps:
(1) Placing polypropylene grafted maleic anhydride, MCC, PP, polyethylene glycol and PLA plastic particles in an electrothermal blowing dryer to be dried for 4 hours at the temperature of 80 ℃;
(2) Adding polyethylene glycol crushed by a medicine crusher into the dried PP and PLA plastic particles, and inputting the mixture into an internal mixer for uniformly mixing;
(3) Inputting the dried MCC, the coupling agent and the PP-g-MA crushed by the medicine crusher into an internal mixer for uniform mixing;
(4) Finally, sequentially inputting the auxiliary agents into an internal mixer for uniform mixing, cooling the mixed materials, then extruding and molding the materials in a double-screw extruder, and carrying out underwater granulation; then putting the granules into an electric heating forced air drier to dry for 6 hours at the temperature of 80 ℃;
(5) And putting the dried granules into a double-screw tape casting extruder for tape casting to form a film.
Preferably, in the preparation method, the mixing temperature in the step (2) is 200-220 ℃, the mixing time is 6-8 min, and the mixing rotating speed is 300rpm; in the step (3), the mixing temperature is 180-200 ℃, the mixing time is 4-6 min, and the mixing speed is 200rpm; the mixing temperature of the step (4) is 140 ℃ to 160 ℃, the mixing time is 3 min to 5min, and the mixing rotating speed is 160rpm; screw length-diameter ratio 52 of twin-screw extruder: 1; output torque is 2X 3500 N.m; input rotation speed 1500rpm; the output rotating speed is 400rpm; transmission speed ratio 3:1, the processing conditions of the double-screw extruder are as follows: first zone 170 ℃: second zone 180 ℃: setting the temperature of the three zones at 190 ℃ and the temperature of the four zones below 190 ℃ to 200 ℃; the speed is 45rpm, melting, vacuum exhausting, plasticizing and extruding; setting parameters of temperature in the twin-screw casting extruder in the step (5) are that the temperature of a charging barrel is 170-200 ℃, the temperature of a die head is 200-220 ℃, and the drawing ratio is 5:1.
the obtained environment-friendly breathable moisture condensation prevention PP/PLA/MCC casting fruit and vegetable packaging film has the following characteristics: the yield strength is 4-7MPa; elongation at break of 275-320%; the Young modulus is 460-535MPa. The coulometric method is used for measuring the test conditions of a sample with the thickness of 30-100 μm, the relative humidity of 40-70% and the temperature of 23 ℃, and the oxygen transmission rate is 550-863cm 3 ·m 2 D, water vapor transmission rate of 480 to 740 g.m 2 D; the carbon dioxide transmission rate is 750-1120cm by pressure difference method under the test conditions of relative humidity of 0% and temperature of 5-23 deg.C 3 ·m 2 D, oxygen transmission rate of 592 to 1000cm 3 ·m 2 ·d。
Compared with the prior art, the invention has the following beneficial effects: the preparation method of the environment-friendly breathable anti-condensation cast packaging film comprises the steps of mixing PP and PLA in a banbury mixer according to a certain proportion, adding PP-g-MA with a certain mass, adding MCC into a proportion system of PP and PLA through a coupling agent, and casting to form the film. The degradable breathable packaging film prepared by the preparation method can be widely applied to the fields of fresh packaging of fruits and vegetables and the like. In the preparation method, the underwater granulator adopts a Siemens motor and is fed pneumatically, the highest rotating speed is 2840 revolutions per minute, and the maximum rotating speed can be matched with the amount of the extruder. The degradable casting film can be prepared into a film with the thickness of 30-80 mu m by sequentially carrying out melting, plasticizing, metering distribution, cooling, traction and rolling in the casting machine according to actual needs and market demands.
Drawings
FIG. 1 is a stress strain diagram of a degradable breathable cast PP/PLA/MCC composite film.
FIG. 2 is a graph of UV transmittance of a degradable breathable cast PP/PLA/MCC composite film.
Detailed Description
Example 1:
(1) 450.0g of PP plastic particles, 50.0g of PLA plastic particles and 5.0g of PEG are put into an internal mixer to be uniformly mixed, wherein the mixing temperature is 200 ℃, the mixing time is 8min, and the mixing speed is 350rpm.
(2) 10.0g of MCC and 5.0g of PP-g-MA are weighed and put into a beaker, two to three drops of butyl titanate coupling agent are dripped into the beaker, the mixture is stirred uniformly by a glass rod and then is input into an internal mixer for uniform mixing, wherein the mixing temperature is 180 ℃, the mixing time is 4min, and the mixing speed is 220rpm.
(3) And finally, sequentially inputting all the auxiliary agents into an internal mixer to be uniformly mixed, cooling the mixed materials, extruding and molding the cooled materials by a double-screw extruder, granulating the materials under water, and drying the granules in an electrothermal blowing dryer at 80 ℃. Wherein the mixing temperature is 140 ℃, the mixing time is 5min, and the mixing speed is 150rpm.
(4) And putting the dried granules into a double-screw casting extruder. Wherein the rotation speed of the main engine is set to be 20.0rpm, the rotation speed of the melt pump is set to be 10.0rpm, the temperature of a section 1 to 8 of the charging barrel is set to be 170-200 ℃, the temperature of a screen changing section, a section 1 to 3 of the transition body and a melt pump section is set to be 200-220 ℃, and the temperature of a section 1 to 3 of the die head is set to be 220 ℃. The linear velocity of each roller of the casting auxiliary machine was set to 2m/min. The temperature of the casting roller is set to 90 ℃, and after extrusion, casting, cooling and forming, trimming and winding are carried out.
The tensile strength of the composite film prepared by the embodiment is 20.80MPa, the elongation at break is 318.02%, and the yield strength is 6.78MPa.
Example 2:
(1) 400.0g of PP plastic particles, 100.0g of PLA plastic particles and 10.0g of PEG were introduced into an internal mixer and mixed uniformly.
(2) 10.0g of MCC and 5.0g of PP-g-MA are weighed and put into a beaker, two drops of butyl titanate coupling agent are added into the beaker, the mixture is stirred uniformly by a glass rod and then is put into an internal mixer to be mixed uniformly, wherein the mixing temperature is 180 ℃, the mixing time is 4min, and the mixing speed is 220rpm.
(3) And finally, sequentially inputting all the auxiliary agents into an internal mixer to be uniformly mixed, cooling the mixed materials, extruding and molding the cooled materials by a double-screw extruder, granulating the materials under water, and drying the granules in an electrothermal blowing dryer at 80 ℃. Wherein the mixing temperature is 150 ℃, the mixing time is 5min, and the mixing speed is 150rpm.
(4) And putting the dried granules into a double-screw casting extruder. Wherein the rotating speed of the main machine is set to be 20.0rpm, the rotating speed of the melt pump is set to be 10.0rpm, the temperature of the sections 1 to 8 of the charging barrel is set to be 170 ℃ to 200 ℃, the temperature of the screen changing section, the temperature of the sections 1 to 3 of the transition body and the temperature of the melt pump section are set to be 200 ℃ to 220 ℃, and the temperature of the sections 1 to 3 of the die head is set to be 220 ℃. The linear velocity of each roller of the casting auxiliary machine was set to 2m/min. The temperature of the casting roller is set to 90 ℃, and after extrusion, casting, cooling and forming, trimming and winding are carried out.
The tensile strength of the composite film prepared in the embodiment is 19.61MPa, the elongation at break is 287.40%, and the yield strength is 6.26MPa.
Example 3:
(1) 350.00g of PP plastic granules, 150.00g of PLA plastic granules and 15.0g of PEG were introduced into an internal mixer and mixed uniformly.
(2) 10.0g of MCC and 5.0g of PP-g-MA are weighed and put into a beaker, two drops of butyl titanate coupling agent are added into the beaker, the mixture is stirred uniformly by a glass rod and then is put into an internal mixer to be mixed uniformly, wherein the mixing temperature is 180 ℃, the mixing time is 4min, and the mixing speed is 220rpm.
(3) And finally, sequentially inputting all the auxiliary agents into an internal mixer to be uniformly mixed, cooling the mixed materials, extruding and molding the cooled materials by a double-screw extruder, granulating the materials under water, and drying the granules in an electrothermal blowing dryer at 80 ℃. Wherein the mixing temperature is 160 ℃, the mixing time is 5min, and the mixing rotation speed is 150rpm.
(4) And putting the dried granules into a double-screw casting extruder. Wherein the rotating speed of the main machine is set to be 20.0rpm, the rotating speed of the melt pump is set to be 10.0rpm, the temperature of the sections 1 to 8 of the charging barrel is set to be 170 ℃ to 200 ℃, the temperature of the screen changing section, the temperature of the sections 1 to 3 of the transition body and the temperature of the melt pump section are set to be 200 ℃ to 220 ℃, and the temperature of the sections 1 to 3 of the die head is set to be 220 ℃. The linear velocity of each roller of the casting auxiliary machine was set to 2m/min. The temperature of the casting roller is set to 90 ℃, and after extrusion, casting, cooling and forming, trimming and winding are carried out.
The tensile strength of the composite film prepared in the embodiment is 16.64MPa, the elongation at break is 281.29%, and the yield strength is 5.43MPa.
Example 4:
(1) 300.00g of PP plastic granules, 200.00g of PLA plastic granules and 20.0g of PEG were introduced into an internal mixer and mixed uniformly.
(2) 10.0g of MCC and 5.0g of PP-g-MA are weighed and put into a beaker, two to three drops of butyl titanate coupling agent are dripped into the beaker, the mixture is stirred uniformly by a glass rod and then is input into an internal mixer for uniform mixing, wherein the mixing temperature is 180 ℃, the mixing time is 4min, and the mixing speed is 220rpm.
(3) And finally, sequentially inputting all the auxiliaries into an internal mixer to be uniformly mixed, cooling the mixed materials, extruding and molding the cooled materials by a double-screw extruder, granulating the materials under water, and drying the granules in an electrothermal blowing dryer at 80 ℃. Wherein the mixing temperature is 140 ℃, the mixing time is 5min, and the mixing speed is 150rpm.
(4) And putting the dried granules into a double-screw casting extruder. Wherein the rotating speed of the main machine is set to be 20.0rpm, the rotating speed of the melt pump is set to be 10.0rpm, the temperature of the sections 1 to 8 of the charging barrel is set to be 170 ℃ to 200 ℃, the temperature of the screen changing section, the temperature of the sections 1 to 3 of the transition body and the temperature of the melt pump section are set to be 200 ℃ to 220 ℃, and the temperature of the sections 1 to 3 of the die head is set to be 220 ℃. The linear velocity of each roller of the casting auxiliary machine was set to 2m/min. The temperature of the casting roller is set to 90 ℃, and after extrusion, casting, cooling and forming, trimming and winding are carried out.
The tensile strength of the composite film prepared in the embodiment is 12.36MPa, the elongation at break is 276.42%, and the yield strength is 4.83MPa.
Table 1: oxygen permeability of different plastic films
The data in Table 1 show that the biological decomposition rate of the plastic film is gradually improved with the mass fraction of PLA, the maximum is 88.6 percent, and the oxygen transmission rate is 559cm 3 ·m 2 ·d；765cm 3 ·m 2 ·d；850cm 3 ·m 2 ·d；863cm 3 ·m 2 D, carbon dioxide transmission rates of 770cm 3 ·m 2 ·d；920cm 3 ·m 2 ·d；110cm 3 ·m 2 ·d；1120cm 3 ·m 2 D; the water vapor permeability is 480 g.m 2 ·d；550g·m 2 ·d；740g·m 2 ·d；740g·m 2 D; the added nano cellulose particles can not only increase the biological decomposition rate of the plastic film, but also form a microporous structure on the plastic film, so that the air permeability of the film is increased, and the air permeability of the plastic film is improved along with the increase of the mass fraction of PLA.
The stress-strain diagrams of the composite films obtained in examples 1 to 4 are shown in fig. 1, and example 1, example 2, example 3 and example 4 are sequentially arranged from top to bottom.
The ultraviolet transmittance of the composite films obtained in examples 1 to 4 is shown in FIG. 2, and examples 1, 2, 3 and 4 are shown from top to bottom.
Claims (1)
1. The environment-friendly breathable moisture condensation preventing PP/PLA/MCC casting fruit and vegetable packaging film is characterized by comprising the following steps:
(1) Inputting 300.00g of PP plastic particles, 200.00g of PLA plastic particles and 20.0g of PEG into an internal mixer for uniformly mixing;
(2) Measuring 10.0g of MCC and 5.0g of PP-g-MA in a beaker, dripping two to three drops of butyl titanate coupling agent, stirring uniformly by using a glass rod, and inputting the mixture into an internal mixer for mixing uniformly, wherein the mixing temperature is 180 ℃, the mixing time is 4min, and the mixing rotating speed is 220rpm;
(3) Finally, all the auxiliaries are sequentially input into an internal mixer to be uniformly mixed, the mixed materials are cooled and then extruded and molded through a double-screw extruder, underwater granulation is carried out, and then granulation is carried out and is placed into an electric heating blowing dryer to be dried at 80 ℃, wherein the mixing temperature is 140 ℃, the mixing time is 5min, and the mixing rotating speed is 150rpm;
(4) Putting the dried granules into a double-screw casting extruder; wherein the rotating speed of the main machine is set to be 20.0rpm, the rotating speed of the melt pump is set to be 10.0rpm, the temperature of a section 1-8 of the charging barrel is set to be 170-200 ℃, the temperature of a screen changing section, a section 1-3 of the transition body and a melt pump section is set to be 200-220 ℃, and the temperature of a section 1-3 of the die head is set to be 220 ℃; the linear velocity of each roller of the casting auxiliary machine is set to be 2m/min; the temperature of the casting roller is set to be 90 ℃, and after extrusion casting cooling molding, trimming and winding are carried out.
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| US8759446B2 (en) * | 2008-06-30 | 2014-06-24 | Fina Technology, Inc. | Compatibilized polypropylene and polylactic acid blends and methods of making and using same |
| US20130102695A1 (en) * | 2011-10-19 | 2013-04-25 | Chieh-Chun Chau | Poly(lactic acid) and polyolefin films containing porosity and sorbents |
| CN205033684U (en) * | 2015-07-08 | 2016-02-17 | 北京印刷学院 | Microcrystalline cellulose modified polypropylene composite films |
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| CA2973879A1 (en) * | 2016-07-19 | 2018-01-19 | University Of Guelph | Biocarbon and nylon based hybrrid carbonaceous biocomposites and methods of making those and using thereof |
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