CN112898674A - Steaming-resistant composite film and production method thereof - Google Patents
Steaming-resistant composite film and production method thereof Download PDFInfo
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Abstract
The invention relates to a steaming-resistant composite film and a production method thereof, belonging to the technical field of steaming films. The random copolymerization polypropylene is adopted, the polypropylene molecular distribution produced by the random copolymerization polypropylene catalyst is smaller than the polypropylene molecular particle size produced by a common catalyst, the content of micromolecules is small, the odor is favorably reduced, meanwhile, the zeolite is added into the raw materials, the property that the zeolite has large specific surface area is utilized, the digestion membrane is favorable for absorbing micromolecule substances such as antioxidant, heat stabilizer, low molecular polymer and the like which are migrated out of the membrane when being cooked at high temperature, the use performance of the high-temperature digestion resistant membrane cannot be influenced, after food packaged in the digestion resistant composite membrane is cooked at high temperature, the digestion resistant composite membrane absorbs a large amount of micromolecule substances, and therefore the micromolecule substances entering the food are lower than the micromolecule substances absorbed by the common digestion membrane.
Description
Technical Field
The invention belongs to the technical field of cooking films, and particularly relates to a cooking-resistant composite film and a production method thereof.
Background
At present, plastic films used in the food packaging industry, such as films made of polyvinyl chloride, polyethylene, polypropylene, polystyrene and other resins, are steamed at high temperature, and the auxiliary agents in the raw materials are as follows: small molecular substances such as an antioxidant, a heat stabilizer, a low molecular polymer, a slipping agent and the like can migrate to generate odor, and the small molecular substances can permeate into food when the food is steamed and cooked, so that certain harm is generated to the health of a human body after the food is eaten by the human body.
For example, the Chinese patent with application number 20101012958.0 discloses a method for producing a cooking film for beverage packaging, which is mainly characterized in that the formula of the main raw material for preparing the conventional cooking film for beverage packaging is improved, high-density polyethylene, medium-density polyethylene, linear low-density polyethylene and metallocene low-density polyethylene in certain weight percentage are adopted, three layers of targeting positioning materials are divided according to certain weight percentage and are mixed with the conventional auxiliary materials, and a three-screw extruder is utilized to prepare the cooking film material for beverage packaging of a composite layer according to the conventional process steps. Although the cooking film for packaging the beverage is not melted and adhered under the conditions of 120-126 ℃ and 0.012Mpa and has strong strength, toughness and puncture resistance, in practical application, the beverage belongs to liquid, and in the process of high-temperature cooking, small molecular substances such as antioxidants, heat stabilizers and the like can overflow from the cooking film for packaging the beverage in the process of high-temperature cooking, and the small molecular substances can enter the beverage, so that a human body can be injured to a certain extent after drinking the beverage, and the beverage cannot be drunk in large quantities.
The environment-friendly steam-resistant composite film is designed, so that the steam-resistant composite film can absorb toxic gas, antioxidant and other small-molecule toxic substances after high-temperature cooking, and meanwhile, the environment-friendly steam-resistant composite film can not affect the food during cooking.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a cooking-resistant composite film which can absorb toxic gas, antioxidant and other small-molecule toxic substances after high-temperature cooking and can not affect the cooked food and a production method thereof.
The invention is realized by the following technical scheme:
the steam-resistant composite film sequentially comprises a composite layer, an intermediate layer and a heat sealing layer from top to bottom, wherein the composite layer, the intermediate layer and the heat sealing layer are formed by co-extrusion, and the composite layer comprises the following components in parts by mass: 90-100 parts of polypropylene resin and 1-10 parts of zeolite master batch; the intermediate layer comprises the following components in parts by mass: 90-100 parts of random copolymerization polypropylene resin and 1-10 parts of zeolite master batch, wherein the heat sealing layer comprises the following components in parts by mass: 90-100 parts of random copolymerization polypropylene resin and 1-10 parts of zeolite.
Further, the composite layer comprises the following components in parts by weight: 95 parts of polypropylene resin and 5 parts of zeolite master batch; the intermediate layer comprises the following components in parts by mass: 95 parts of random copolymerization polypropylene resin and 5 parts of zeolite master batch, wherein the heat sealing layer comprises the following components in parts by mass: 95 parts of random copolymerization polypropylene resin and 5 parts of zeolite.
Further, the zeolite master batch comprises the following components in parts by mass: 1-10 parts of zeolite, 0.2-2 parts of distearoyl isopropoxy aluminate coupling agent, 1-5 parts of lubricant and 1-5 parts of dispersant.
Further, the zeolite master batch comprises the following components in parts by mass: 5 parts of zeolite, 1 part of distearoyl isopropoxy aluminate coupling agent, 3 parts of lubricant and 3 parts of dispersant.
Further, the lubricant is zinc stearate, and the dispersing agent is polyethylene wax.
The production method of the steaming-resistant composite film comprises the following steps:
step one, preparing a zeolite master batch:
1) grinding and sieving:
according to the mass ratio, putting the zeolite into a ball mill, and mixing the zeolite: grinding balls: ball milling is carried out on water in a ratio of 1:2:0.6 to obtain ball-milled zeolite material, the obtained ball-milled zeolite material is sieved by a 500-mesh sieve to obtain first sieved zeolite material, and the obtained ball-milled zeolite material is sieved by a 800-mesh sieve to obtain second sieved zeolite material;
2) mixing:
a. placing half of the first sieved zeolite material obtained in the step 1), the dispersant, the lubricant and the distearoyl isopropoxy aluminate coupling agent in a high-speed mixer according to the mass ratio, and uniformly mixing to obtain a premix, wherein the mixing temperature of the high-speed mixer is 30-40 ℃, the mixing time of the high-speed mixer is 9-11 min, and the rotating speed of the high-speed mixer is 300-400 r/min;
b. adding the residual second sieved zeolite obtained in the step 1) into the obtained premix, and uniformly mixing to obtain a primary mixed material, wherein the mixing temperature of a high-speed mixer is 30-40 ℃, the mixing time of the high-speed mixer is 4-6 min, and the rotating speed of the high-speed mixer is 500-700 r/min;
c. and (2) adding the second sieved zeolite material obtained in the step one 1) into the primary mixed material, uniformly mixing, filtering and drying to obtain the modified zeolite material, wherein the mixing temperature of a high-speed mixer is 30-40 ℃, the mixing time of the high-speed mixer is 9-11 min, the rotating speed of the high-speed mixer is 500-700 r/min, the drying temperature is 50-55 ℃, and the drying time is 2-4 h.
3) And (3) granulation: putting the modified zeolite material obtained in the step one 2) into a double-screw granulator for extrusion granulation to obtain a zeolite master batch, wherein the temperature during extrusion granulation is as follows: the first heating area is 100-180 ℃, the second heating area is 180-230 ℃, the third heating area is 180-230 ℃, the fourth heating area is 180-230 ℃, the fifth heating area is 180-230 ℃, the sixth heating area is 180-230 ℃, and the temperature of cooling water is 29-32 ℃;
step two, film extrusion molding:
1) uniformly mixing the zeolite master batch obtained in the step one 3), the polypropylene resin, the dispersant and the lubricant according to the mass ratio to obtain a composite layer mixture;
uniformly mixing the zeolite master batch obtained in the step one 3), the polypropylene random copolymer resin, the dispersant and the lubricant to obtain an intermediate layer mixture;
uniformly mixing the zeolite, the random copolymer polypropylene resin, the dispersant and the lubricant to obtain a heat seal layer mixture;
2) respectively putting the composite layer mixture obtained in the step two 1), the intermediate layer mixture and the heat sealing layer mixture into each screw of a multi-layer extruder, performing film extrusion, and then rolling and slitting to obtain a steaming-resistant composite film;
the temperature of a first heating area of a screw of a multi-layer extruder in which the composite layer mixture is located is 100-180 ℃, the temperature of a second heating area is 180-230 ℃, the temperature of a third heating area is 180-230 ℃, the temperature of a fourth heating area is 180-230 ℃, the temperature of a fifth heating area is 180-230 ℃, the temperature of a sixth heating area is 180-230 ℃, and the thickness of the extruded composite layer accounts for 5-50% of the total thickness of the steaming-resistant composite film;
wherein the temperature of a first heating area of a screw rod of a multi-layer extruder in which the mixture of the middle layer is located is 90-180 ℃, the temperature of a second heating area is 160-230 ℃, the temperature of a third heating area is 180-230 ℃, the temperature of a fourth heating area is 180-230 ℃, the temperature of a fifth heating area is 180-230 ℃, the temperature of a sixth heating area is 180-230 ℃, and the thickness of the extruded middle layer accounts for 5-50% of the total thickness of the steaming-resistant composite film;
the temperature of a first heating area of a screw of a multi-layer extruder where the heat-seal layer mixture is located is 90-180 ℃, the temperature of a second heating area is 160-230 ℃, the temperature of a third heating area is 180-230 ℃, the temperature of a fourth heating area is 180-230 ℃, the temperature of a fifth heating area is 180-230 ℃, the temperature of a sixth heating area is 180-230 ℃, and the thickness of the extruded heat-seal layer accounts for 5-50% of the total thickness of the steaming-resistant composite film;
further, in the step one 2), the mixing temperature of the high-speed mixer is 35 ℃, the mixing time of the high-speed mixer is 10min, and the rotating speed of the high-speed mixer is 350 r/min;
in the step one 2) b), the mixing temperature of the high-speed mixer is 35 ℃, the mixing time of the high-speed mixer is 5min, and the rotating speed of the high-speed mixer is 600 r/min;
in the step one 2) c, the mixing temperature of the high-speed mixer is 35 ℃, the mixing time of the high-speed mixer is 10min, and the rotating speed of the high-speed mixer is 600 r/min.
Further, the temperature range during extrusion granulation in the step one 3) is as follows: heating the first zone at 150 ℃, the second zone at 200 ℃, the third zone at 200 ℃, the fourth zone at 200 ℃, the fifth zone at 200 ℃, the sixth zone at 200 ℃ and the cooling water at 30 ℃;
further, the temperature of a first heating area of the screw of the multi-layer extruder in which the composite layer mixture is located in the second step 2) is 150 ℃, the temperature of a second heating area is 200 ℃, the temperature of a third heating area is 200 ℃, the temperature of a fourth heating area is 200 ℃, the temperature of a fifth heating area is 200 ℃, the temperature of a sixth heating area is 200 ℃, and the thickness of the extruded composite layer accounts for 5% of the total thickness of the steaming and boiling resistant composite film;
the temperature of a first heating area of a screw rod of a multi-layer extruder in which the intermediate layer mixture is positioned in the step 2) is 150 ℃, the temperature of a second heating area is 200 ℃, the temperature of a third heating area is 200 ℃, the temperature of a fourth heating area is 200 ℃, the temperature of a fifth heating area is 200 ℃, the temperature of a sixth heating area is 200 ℃, and the thickness of the extruded intermediate layer accounts for 50% of the total thickness of the steaming and boiling resistant composite film;
in the step 2), the temperature of a first heating area of a screw of a multi-layer extruder in which the heat seal layer mixture is located is 150 ℃, the temperature of a second heating area is 200 ℃, the temperature of a third heating area is 200 ℃, the temperature of a fourth heating area is 200 ℃, the temperature of a fifth heating area is 200 ℃, the temperature of a sixth heating area is 200 ℃, and the thickness of the extruded heat seal layer accounts for 45% of the total thickness of the steaming and boiling resistant composite film.
The invention has the beneficial effects that:
compared with the prior art, when the zeolite master batch is prepared, the distearoyl isopropoxy aluminate coupling agent is used for modifying zeolite, low-temperature and low-speed premixing is carried out in the modification process, the distearoyl isopropoxy aluminate coupling agent is favorably and uniformly pre-dispersed in the zeolite, the zeolite is not agglomerated and the coupling agent is not volatilized at low temperature, then the speed is increased, the added zeolite uniformly adsorbs the distearoyl isopropoxy aluminate coupling agent, partial added zeolite is more favorable for dispersion than one-time addition, the problem of local dispersion unevenness is avoided, the dispersion effect is optimal, and finally, the zeolite with smaller particle size is added for final mixing modification, so that the adsorption effect of the steaming-resistant composite membrane is improved.
The random copolymerization polypropylene is adopted, the polypropylene molecular distribution produced by the random copolymerization polypropylene catalyst is smaller than the polypropylene molecular particle size produced by the common catalyst, the small molecular content is less, the odor is favorably reduced, meanwhile, the zeolite is added into the raw materials, the property of large specific surface area of the zeolite is utilized, the small molecular substances such as antioxidant, heat stabilizer, low molecular polymer and the like which are migrated out of the film are favorably absorbed by the cooking film when the cooking film is cooked at high temperature, the use performance of the high temperature cooking resistant film is not influenced, after food packaged in the cooking resistant composite film is cooked at high temperature, the cooking resistant composite film absorbs a large amount of small molecular substances, so that the small molecular substances entering the food are less than the small molecular substance content absorbed by the common cooking film, and the detection data shows that the cooking resistant composite film of the invention has twice of the small molecular substance content compared with the common cooking film, the cooking-resistant composite film of the invention is proved to absorb a large part of small molecular substances, thereby ensuring that the food is not secondarily polluted.
Detailed Description
The present invention is described in further detail below by way of specific embodiments, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
Wherein, the distearoyl isopropoxy aluminate coupling agent is produced by Nanjing Yopu chemical Co., Ltd, and the model is UP-801;
the random copolymer polypropylene may be obtained from the following company
Polymirae, model HM 2089;
taiwan plastic industry ltd, model number F4008;
japanese JPE, model MR2007 or MF 650Y;
the zeolite may be obtained from the following companies:
the model of the river south sea charm environmental protection technology limited company is UB 1061;
ningbo Jia and New Material science and technology, Inc., No. 0001;
the polyethylene wax can be obtained from the following companies:
yiyao Yi plastication Co Ltd, type PE wax YJ 2108;
qianconheng trade company of Wuxi city, model number is H-110;
guangzhou, a Wang high chemical Co., Ltd, model number HEX-F.
Example 1
The steam-resistant composite film sequentially comprises a composite layer, an intermediate layer and a heat sealing layer from top to bottom, wherein the composite layer, the intermediate layer and the heat sealing layer are formed by co-extrusion, and the composite layer comprises the following components in parts by mass: 90 parts of polypropylene resin and 1 part of zeolite master batch; the intermediate layer comprises the following components in parts by mass: 90 parts of random copolymerization polypropylene resin and 1 part of zeolite master batch, wherein the heat sealing layer comprises the following components in parts by mass: 90 parts of random copolymerization polypropylene resin and 1 part of zeolite.
The zeolite master batch comprises the following components in parts by mass: 1 part of zeolite, 0.2 part of distearoyl isopropoxy aluminate coupling agent, 1 part of lubricant and 1 part of dispersant.
Wherein the lubricant is zinc stearate, and the dispersing agent is polyethylene wax.
The production method of the steaming-resistant composite film comprises the following steps:
step one, preparing a zeolite master batch:
1) grinding and sieving:
according to the mass ratio, putting the zeolite into a ball mill, and mixing the zeolite: grinding balls: ball milling is carried out on water in a ratio of 1:2:0.6 to obtain ball-milled zeolite material, the obtained ball-milled zeolite material is sieved by a 500-mesh sieve to obtain first sieved zeolite material, and the obtained ball-milled zeolite material is sieved by a 800-mesh sieve to obtain second sieved zeolite material;
2) mixing:
a. according to the mass ratio, putting half of the first sieving zeolite material obtained in the step 1), the dispersant, the lubricant and the distearoyl isopropoxy aluminate coupling agent in a high-speed mixer at the same time, and uniformly mixing to obtain a premix, wherein the mixing temperature of the high-speed mixer is 30 ℃, the mixing time of the high-speed mixer is 9min, and the rotating speed of the high-speed mixer is 300 r/min;
b. adding the rest second sieved zeolite obtained in the step 1) into the obtained premix, and uniformly mixing to obtain a primary mixed material, wherein the mixing temperature of a high-speed mixer is 30 ℃, the mixing time of the high-speed mixer is 4min, and the rotating speed of the high-speed mixer is 500 r/min;
c. and (2) adding the second sieved zeolite material obtained in the step one 1) into the obtained primary mixed material, uniformly mixing, filtering and drying to obtain the modified zeolite material, wherein the mixing temperature of a high-speed mixer is 30 ℃, the mixing time of the high-speed mixer is 9min, the rotating speed of the high-speed mixer is 500r/min, the drying temperature is 50 ℃, and the drying time is 2 h.
3) And (3) granulation: putting the modified zeolite material obtained in the step one 2) into a double-screw granulator for extrusion granulation to obtain a zeolite master batch, wherein the temperature during extrusion granulation is as follows: heating a first area at 100 ℃, a second area at 180 ℃, a third area at 180 ℃, a fourth area at 180 ℃, a fifth area at 180 ℃, a sixth area at 180 ℃, and a cooling water temperature at 29 ℃;
step two, film extrusion molding:
1) uniformly mixing the zeolite master batch obtained in the step one 3), the polypropylene resin, the dispersant and the lubricant according to the mass ratio to obtain a composite layer mixture;
uniformly mixing the zeolite master batch obtained in the step one 3), the polypropylene random copolymer resin, the dispersant and the lubricant to obtain an intermediate layer mixture;
uniformly mixing the zeolite, the random copolymer polypropylene resin, the dispersant and the lubricant to obtain a heat seal layer mixture;
2) respectively putting the composite layer mixture obtained in the step two 1), the intermediate layer mixture and the heat sealing layer mixture into each screw of a multi-layer extruder, performing film extrusion, and then rolling and slitting to obtain a steaming-resistant composite film;
wherein the temperature of a first heating area of a screw rod of a multi-layer extruder in which the composite layer mixture is positioned is 100 ℃, the temperature of a second heating area is 180 ℃, the temperature of a third heating area is 180 ℃, the temperature of a fourth heating area is 180 ℃, the temperature of a fifth heating area is 180 ℃, the temperature of a sixth heating area is 180 ℃, and the thickness of the extruded composite layer accounts for 45% of the total thickness of the steaming-resistant composite film;
wherein the temperature of a first heating area of a screw rod of a multi-layer extruder in which the mixture of the middle layer is positioned is 90 ℃, the temperature of a second heating area is 160 ℃, the temperature of a third heating area is 180 ℃, the temperature of a fourth heating area is 180 ℃, the temperature of a fifth heating area is 180 ℃, the temperature of a sixth heating area is 180 ℃, and the thickness of the extruded middle layer accounts for 5% of the total thickness of the steaming-resistant composite film;
wherein the temperature of a first heating area of a screw of a multi-layer extruder in which the heat seal layer mixture is positioned is 90 ℃, the temperature of a second heating area is 160 ℃, the temperature of a third heating area is 180 ℃, the temperature of a fourth heating area is 180 ℃, the temperature of a fifth heating area is 180 ℃, the temperature of a sixth heating area is 180 ℃, and the thickness of the extruded heat seal layer accounts for 50% of the total thickness of the steaming-resistant composite film.
Example 2
The steam-resistant composite film sequentially comprises a composite layer, an intermediate layer and a heat sealing layer from top to bottom, wherein the composite layer, the intermediate layer and the heat sealing layer are formed by co-extrusion, and the composite layer comprises the following components in parts by mass: 95 parts of polypropylene resin and 5 parts of zeolite master batch; the intermediate layer comprises the following components in parts by mass: 95 parts of random copolymerization polypropylene resin and 5 parts of zeolite master batch, wherein the heat sealing layer comprises the following components in parts by mass: 95 parts of random copolymerization polypropylene resin and 5 parts of zeolite.
The zeolite master batch comprises the following components in parts by mass: 5 parts of zeolite, 1 part of distearoyl isopropoxy aluminate coupling agent, 3 parts of lubricant and 3 parts of dispersant.
Wherein the lubricant is zinc stearate, and the dispersing agent is polyethylene wax.
The production method of the steaming-resistant composite film comprises the following steps:
step one, preparing a zeolite master batch:
1) grinding and sieving:
according to the mass ratio, putting the zeolite into a ball mill, and mixing the zeolite: grinding balls: ball milling is carried out on water in a ratio of 1:2:0.6 to obtain ball-milled zeolite material, the obtained ball-milled zeolite material is sieved by a 500-mesh sieve to obtain first sieved zeolite material, and the obtained ball-milled zeolite material is sieved by a 800-mesh sieve to obtain second sieved zeolite material;
2) mixing:
a. according to the mass ratio, putting half of the first sieving zeolite material obtained in the step 1), the dispersant, the lubricant and the distearoyl isopropoxy aluminate coupling agent in a high-speed mixer at the same time, and uniformly mixing to obtain a premix, wherein the mixing temperature of the high-speed mixer is 35 ℃, the mixing time of the high-speed mixer is 10min, and the rotating speed of the high-speed mixer is 350 r/min;
b. adding the rest second sieved zeolite obtained in the step 1) into the obtained premix, and uniformly mixing to obtain a primary mixed material, wherein the mixing temperature of a high-speed mixer is 35 ℃, the mixing time of the high-speed mixer is 5min, and the rotating speed of the high-speed mixer is 600 r/min;
c. and (2) adding the second sieved zeolite material obtained in the step one 1) into the primary mixed material, uniformly mixing, filtering and drying to obtain the modified zeolite material, wherein the mixing temperature of a high-speed mixer is 35 ℃, the mixing time of the high-speed mixer is 10min, the rotating speed of the high-speed mixer is 600r/min, the drying temperature is 53 ℃, and the drying time is 3 h.
3) And (3) granulation: putting the modified zeolite material obtained in the step one 2) into a double-screw granulator for extrusion granulation to obtain a zeolite master batch, wherein the temperature during extrusion granulation is as follows: heating the first zone at 150 ℃, the second zone at 200 ℃, the third zone at 200 ℃, the fourth zone at 200 ℃, the fifth zone at 200 ℃, the sixth zone at 200 ℃ and the cooling water at 30 ℃;
step two, film extrusion molding:
1) uniformly mixing the zeolite master batch obtained in the step one 3), the polypropylene resin, the dispersant and the lubricant according to the mass ratio to obtain a composite layer mixture;
uniformly mixing the zeolite master batch obtained in the step one 3), the polypropylene random copolymer resin, the dispersant and the lubricant to obtain an intermediate layer mixture;
uniformly mixing the zeolite, the random copolymer polypropylene resin, the dispersant and the lubricant to obtain a heat seal layer mixture;
2) respectively putting the composite layer mixture obtained in the step two 1), the intermediate layer mixture and the heat sealing layer mixture into each screw of a multi-layer extruder, performing film extrusion, and then rolling and slitting to obtain a steaming-resistant composite film;
wherein the temperature of a first heating area of a screw rod of a multi-layer extruder in which the composite layer mixture is positioned is 150 ℃, the temperature of a second heating area is 200 ℃, the temperature of a third heating area is 200 ℃, the temperature of a fourth heating area is 200 ℃, the temperature of a fifth heating area is 200 ℃, the temperature of a sixth heating area is 200 ℃, and the thickness of the extruded composite layer accounts for 5% of the total thickness of the steaming-resistant composite film;
wherein the temperature of a first heating area of a screw rod of a multi-layer extruder in which the mixture of the middle layer is positioned is 150 ℃, the temperature of a second heating area is 200 ℃, the temperature of a third heating area is 200 ℃, the temperature of a fourth heating area is 200 ℃, the temperature of a fifth heating area is 200 ℃, the temperature of a sixth heating area is 200 ℃, and the thickness of the extruded middle layer accounts for 50% of the total thickness of the steaming-resistant composite film;
the temperature of a first heating area of a screw of a multi-layer extruder where the heat-seal layer mixture is located is 150 ℃, the temperature of a second heating area is 200 ℃, the temperature of a third heating area is 200 ℃, the temperature of a fourth heating area is 200 ℃, the temperature of a fifth heating area is 200 ℃, the temperature of a sixth heating area is 200 ℃, and the thickness of an extruded heat-seal layer accounts for 45% of the total thickness of the steaming-resistant composite film.
Example 3
The steam-resistant composite film sequentially comprises a composite layer, an intermediate layer and a heat sealing layer from top to bottom, wherein the composite layer, the intermediate layer and the heat sealing layer are formed by co-extrusion, and the composite layer comprises the following components in parts by mass: 100 parts of polypropylene resin and 10 parts of zeolite master batch; the intermediate layer comprises the following components in parts by mass: 100 parts of random copolymerization polypropylene resin and 10 parts of zeolite master batch, wherein the heat sealing layer comprises the following components in parts by mass: 100 parts of random copolymerization polypropylene resin and 10 parts of zeolite.
The zeolite master batch comprises the following components in parts by mass: 10 parts of zeolite, 2 parts of distearoyl isopropoxy aluminate coupling agent, 5 parts of lubricant and 5 parts of dispersant.
Wherein the lubricant is zinc stearate, and the dispersing agent is polyethylene wax.
The production method of the steaming-resistant composite film comprises the following steps:
step one, preparing a zeolite master batch:
1) grinding and sieving:
according to the mass ratio, putting the zeolite into a ball mill, and mixing the zeolite: grinding balls: ball milling is carried out on water in a ratio of 1:2:0.6 to obtain ball-milled zeolite material, the obtained ball-milled zeolite material is sieved by a 500-mesh sieve to obtain first sieved zeolite material, and the obtained ball-milled zeolite material is sieved by a 800-mesh sieve to obtain second sieved zeolite material;
2) mixing:
a. placing half of the first sieved zeolite material obtained in the step 1), the dispersant, the lubricant and the distearoyl isopropoxy aluminate coupling agent in a high-speed mixer according to the mass ratio, and uniformly mixing to obtain a premix, wherein the mixing temperature of the high-speed mixer is 40 ℃, the mixing time of the high-speed mixer is 11min, and the rotating speed of the high-speed mixer is 400 r/min;
b. adding the rest second sieved zeolite obtained in the step 1) into the obtained premix, and uniformly mixing to obtain a primary mixed material, wherein the mixing temperature of a high-speed mixer is 40 ℃, the mixing time of the high-speed mixer is 6min, and the rotating speed of the high-speed mixer is 700 r/min;
c. and (2) adding the second sieved zeolite material obtained in the step one 1) into the primary mixed material, uniformly mixing, filtering and drying to obtain the modified zeolite material, wherein the mixing temperature of a high-speed mixer is 40 ℃, the mixing time of the high-speed mixer is 11min, the rotating speed of the high-speed mixer is 700r/min, the drying temperature is 55 ℃, and the drying time is 4 h.
3) And (3) granulation: putting the modified zeolite material obtained in the step one 2) into a double-screw granulator for extrusion granulation to obtain a zeolite master batch, wherein the temperature during extrusion granulation is as follows: heating a first area at 180 ℃, a second area at 230 ℃, a third area at 230 ℃, a fourth area at 230 ℃, a fifth area at 230 ℃, a sixth area at 230 ℃ and cooling water at 32 ℃;
step two, film extrusion molding:
1) uniformly mixing the zeolite master batch obtained in the step one 3), the polypropylene resin, the dispersant and the lubricant according to the mass ratio to obtain a composite layer mixture;
uniformly mixing the zeolite master batch obtained in the step one 3), the polypropylene random copolymer resin, the dispersant and the lubricant to obtain an intermediate layer mixture;
uniformly mixing the zeolite, the random copolymer polypropylene resin, the dispersant and the lubricant to obtain a heat seal layer mixture;
2) respectively putting the composite layer mixture obtained in the step two 1), the intermediate layer mixture and the heat sealing layer mixture into each screw of a multi-layer extruder, performing film extrusion, and then rolling and slitting to obtain a steaming-resistant composite film;
wherein the temperature of a first heating area of a screw rod of a multi-layer extruder in which the composite layer mixture is positioned is 180 ℃, the temperature of a second heating area is 230 ℃, the temperature of a third heating area is 230 ℃, the temperature of a fourth heating area is 230 ℃, the temperature of a fifth heating area is 230 ℃, the temperature of a sixth heating area is 230 ℃, and the thickness of the extruded composite layer accounts for 50% of the total thickness of the steaming-resistant composite film;
wherein the temperature of a first heating area of a screw rod of a multi-layer extruder in which the mixture of the middle layer is positioned is 180 ℃, the temperature of a second heating area is 230 ℃, the temperature of a third heating area is 230 ℃, the temperature of a fourth heating area is 230 ℃, the temperature of a fifth heating area is 230 ℃, the temperature of a sixth heating area is 230 ℃, and the thickness of the extruded middle layer accounts for 45% of the total thickness of the steaming-resistant composite film;
the temperature of a first heating area of a screw of a multi-layer extruder where the heat-sealing layer mixture is located is 180 ℃, the temperature of a second heating area is 230 ℃, the temperature of a third heating area is 230 ℃, the temperature of a fourth heating area is 230 ℃, the temperature of a fifth heating area is 230 ℃, the temperature of a sixth heating area is 230 ℃, and the thickness of an extruded heat-sealing layer accounts for 5% of the total thickness of the steaming-resistant composite film.
After the composite membrane is cooked at high temperature, the phenomenon that micromolecule substances such as antioxidants and the like contained in the composite membrane and a common cooking membrane overflow when the composite membrane and the common cooking membrane are cooked at high temperature can be caused, but the composite membrane can absorb most micromolecule substances such as antioxidants and the like overflowing when the composite membrane is cooked at high temperature due to the material composition and the structural characteristics of the composite membrane, so that the content of micromolecule substances such as oxidants and the like entering food in the composite membrane is reduced, and the eating health of people is guaranteed; after the common cooking film is cooked at high temperature, the common cooking film cannot absorb most of small molecular substances such as antioxidants and the like overflowing during the high-temperature cooking, so that the small molecular substances such as the oxidants and the like overflowing during the high-temperature cooking enter food in the common cooking film, and great health potential safety hazards can be caused after people eat the common cooking film.
Claims (3)
1. A boiling-resistant composite film is characterized in that: the composite steaming and boiling resistant film is sequentially composed of a composite layer, an intermediate layer and a heat sealing layer from top to bottom, wherein the composite layer, the intermediate layer and the heat sealing layer are formed by co-extrusion, and the composite layer comprises the following components in parts by mass: 95 parts of polypropylene resin and 5 parts of zeolite master batch; the intermediate layer comprises the following components in parts by mass: 95 parts of random copolymerization polypropylene resin and 5 parts of zeolite master batch, wherein the heat sealing layer comprises the following components in parts by mass: 95 parts of random copolymerization polypropylene resin and 5 parts of zeolite; the zeolite master batch comprises the following components in parts by mass: 5 parts of zeolite, 1 part of distearoyl isopropoxy aluminate coupling agent, 3 parts of lubricant and 3 parts of dispersant; the lubricant is zinc stearate, and the dispersing agent is polyethylene wax.
2. A method for producing a retortable composite film according to claim 1, characterized in that: the method comprises the following steps:
step one, preparing a zeolite master batch:
1) grinding and sieving: according to the mass ratio, putting the zeolite into a ball mill, and mixing the zeolite: grinding balls: ball milling is carried out on water in a ratio of 1:2:0.6 to obtain ball-milled zeolite material, the obtained ball-milled zeolite material is sieved by a 500-mesh sieve to obtain first sieved zeolite material, the obtained ball-milled zeolite material is sieved by a 800-mesh sieve, and the second sieved zeolite material is obtained;
2) mixing: a. placing half of the first sieved zeolite material obtained in the step 1), the dispersant, the lubricant and the distearoyl isopropoxy aluminate coupling agent in a high-speed mixer according to the mass ratio, and uniformly mixing to obtain a premix, wherein the mixing temperature of the high-speed mixer is 35 ℃, the mixing time of the high-speed mixer is 10min, and the rotating speed of the high-speed mixer is 350 r/min; b. adding the rest first sieved zeolite material obtained in the step 1) into the obtained premix, and uniformly mixing to obtain a primary mixed material, wherein the mixing temperature of a high-speed mixer is 35 ℃, the mixing time of the high-speed mixer is 5min, and the rotating speed of the high-speed mixer is 600 r/min; c. adding the second sieved zeolite material obtained in the step one 1) into the primary mixed material, uniformly mixing, and filtering and drying to obtain modified zeolite material, wherein the mixing temperature of a high-speed mixer is 35 ℃, the mixing time of the high-speed mixer is 10min, the rotating speed of the high-speed mixer is 600r/min, the drying temperature is 53 ℃, and the drying time is 3 h;
3) and (3) granulation: putting the modified zeolite material obtained in the step one 2) into a double-screw granulator for extrusion granulation to obtain a zeolite master batch, wherein the temperature during extrusion granulation is as follows: heating the first zone at 150 ℃, the second zone at 200 ℃, the third zone at 200 ℃, the fourth zone at 200 ℃, the fifth zone at 200 ℃, the sixth zone at 200 ℃ and the cooling water at 30 ℃;
step two, film extrusion molding:
1) uniformly mixing the zeolite master batch obtained in the step one 3), the polypropylene resin, the dispersant and the lubricant according to the mass ratio to obtain a composite layer mixture; uniformly mixing the zeolite master batch obtained in the step one 3), the polypropylene random copolymer resin, the dispersant and the lubricant to obtain an intermediate layer mixture; uniformly mixing the zeolite, the random copolymer polypropylene resin, the dispersant and the lubricant to obtain a heat seal layer mixture;
2) and (2) respectively putting the composite layer mixture obtained in the step two 1), the intermediate layer mixture and the heat sealing layer mixture into each screw of a multilayer extruder, extruding the films, and then rolling and slitting to obtain the steaming-resistant composite film.
3. A method for producing a retortable composite film according to claim 1, characterized in that: the temperature of a first heating area of a screw rod of a multi-layer extruder in which the composite layer mixture is positioned is 150 ℃, the temperature of a second heating area is 200 ℃, the temperature of a third heating area is 200 ℃, the temperature of a fourth heating area is 200 ℃, the temperature of a fifth heating area is 200 ℃, the temperature of a sixth heating area is 200 ℃, and the thickness of the extruded composite layer accounts for 5% of the total thickness of the steaming-resistant composite film; wherein the temperature of a first heating area of a screw rod of a multi-layer extruder in which the mixture of the middle layer is positioned is 150 ℃, the temperature of a second heating area is 200 ℃, the temperature of a third heating area is 200 ℃, the temperature of a fourth heating area is 200 ℃, the temperature of a fifth heating area is 200 ℃, the temperature of a sixth heating area is 200 ℃, and the thickness of the extruded middle layer accounts for 50% of the total thickness of the steaming-resistant composite film; the temperature of a first heating area of a screw of a multi-layer extruder where the heat-seal layer mixture is located is 150 ℃, the temperature of a second heating area is 200 ℃, the temperature of a third heating area is 200 ℃, the temperature of a fourth heating area is 200 ℃, the temperature of a fifth heating area is 200 ℃, the temperature of a sixth heating area is 200 ℃, and the thickness of an extruded heat-seal layer accounts for 45% of the total thickness of the steaming-resistant composite film.
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