CN113788973A - PET easy-to-tear film and preparation method thereof - Google Patents

PET easy-to-tear film and preparation method thereof Download PDF

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CN113788973A
CN113788973A CN202111092309.4A CN202111092309A CN113788973A CN 113788973 A CN113788973 A CN 113788973A CN 202111092309 A CN202111092309 A CN 202111092309A CN 113788973 A CN113788973 A CN 113788973A
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coating
pet
film
drying
base layer
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李朝辉
黎坛
王俊峰
邢青涛
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Hainan Shiner Industrial Co Ltd
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Hainan Shiner Industrial Co Ltd
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    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/052—Forming heat-sealable coatings
    • 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
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
    • 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
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
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    • C08J7/048—Forming gas barrier coatings
    • 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
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
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    • C—CHEMISTRY; METALLURGY
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    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
    • C09D123/02—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D123/04—Homopolymers or copolymers of ethene
    • C09D123/08—Copolymers of ethene
    • C09D123/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
    • C09D123/0869—Acids or derivatives thereof
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    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
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    • C08J2367/00—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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    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
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Abstract

The invention provides a PET easy-to-tear film which comprises a PET base layer and an acrylic coating compounded on the surface of the PET base layer. The PET easy-uncovering film provided by the invention has the following advantages: 1. the heat-seal strength is moderate, the sealing capability of the box cover can be guaranteed, the cover can be easily opened when the cover is opened, and the effect of easily uncovering the cover is achieved. 2. Excellent barrier effect ensures that the fresh fruits in the bag can not taint with each other when being stored together. 3. The cold antifogging effect can achieve the effect that water mist and water drops are not condensed on the film surface, and the problem that the packaged fresh vegetables and fresh vegetables are placed in a freezer for refrigeration due to the fact that the temperature difference between the cold temperature and the hot temperature leads to the fogging phenomenon of the packaging box is solved. When the packing box is purchased, a consumer can easily see the state of the real object in the packing box, and the purchasing desire of the consumer is enhanced. 4. Meets the requirement of recycling the same material according to the requirement of environmental protection.

Description

PET easy-to-tear film and preparation method thereof
Technical Field
The invention relates to the technical field of food packaging, in particular to a PET easy-to-tear film and a preparation method thereof.
Background
The traditional food box package sealing for fresh food is realized by laminating a film on the surface of a film or compounding the film and then performing heat sealing with a PET box. However, the laminating method has some disadvantages: one is as follows: when the film is uncovered, the film is not uncovered easily due to overlarge heat seal, and the fluctuation of heat seal strength is large due to uneven film spraying; the second step is as follows: the thickness of the laminating layer is thicker and is generally 10-70 mu m, and the base material of the laminating layer is more common paper, so that the transparency is poor or the laminating layer is completely opaque; and thirdly: not conform to the same material requirement of environmental protection requirement because the box that is used for splendid attire fresh fruit generally all adopts the PET material, but is used for drenching the membrane substrate and is the paper and drench the material of membrane and be PP, consequently does not conform to the requirement of the unified material recycle of environmental protection. Therefore, the market urgently needs a sealing film which can be applied to sealing of the fresh packaging box to replace the existing film spraying mode.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a PET easy-to-tear film and a preparation method thereof, wherein the coating is coated on the PET film by a coating method, so that the PET easy-to-tear film can be heat-sealed with an APET box, and a seal is easy to tear.
In order to achieve the purpose, the invention provides a PET easy-to-tear film which comprises a PET base layer and an acrylic coating compounded on the surface of the PET base layer.
The coating is coated on the PET film in a coating mode, so that the advantages of heat sealing with a PET box, easy opening of a seal, high transparency, low cost, simple process and good cold anti-fog effect can be achieved.
Preferably, the PET substrate is BOPET.
Preferably, the thickness of the PET base layer is 20-30 μm. More preferably 25 μm.
Preferably, the acrylic coating comprises, by weight:
Figure BDA0003267823850000011
Figure BDA0003267823850000021
the first palm wax has a lower molecular weight than the second palm wax.
In the invention, the content of the soft water is preferably 66-82%; more preferably 66%.
In the invention, the content of the ethylene-acrylic acid copolymer is preferably 12-16%; more preferably 16%.
Preferably, the amino resin is selected from AA-9077 aqueous amino resin.
The content of the amino resin is preferably 5 to 7 percent; more preferably 7%.
The content of the maleic anhydride tackifier is preferably 0.5-1.5%; more preferably 1.5%.
Preferably, the nonionic surfactant is selected from polyethylene glycol-based nonionic surfactants.
The content of the mixed emulsifier is preferably 1.2-3.5%; more preferably 3.0%.
The mass ratio of the secondary alkane sulfonic acid sodium to the nonionic surfactant is preferably 2-3: 1, and more preferably 2: 1.
Preferably, the initiator is selected from sodium persulfate.
The content of the initiator is preferably 0.1-1.0%; more preferably 1.0%.
Preferably, the defoaming agent is selected from polyether defoaming agents, and is more preferably GP type glycerol polyether defoaming agent.
The content of the defoaming agent is preferably 0.3% -0.5%; more preferably 0.5%.
Preferably, the pH adjuster is selected from multifunctional amine pH adjusters, more preferably amine vancatadeventex pH adjusters.
The content of the pH regulator is preferably 0.2-0.3%; more preferably 0.3%.
The content of the silicon dioxide separant is preferably 0.2 to 0.5 percent; more preferably 0.5%.
The content of the first palm wax is preferably 0.5-1.5%; more preferably 1.5%.
The second palm wax is preferably an ML-180 wax emulsion.
The content of the second palm wax is preferably 2.5-3.5%; more preferably 3.0%.
The total amount of the components meets 100 percent.
The molecular weight of the second palm wax is larger than that of the first palm wax, two kinds of palm waxes with different molecular weights are adopted, and in the using process, the wax with the small molecular weight is preferentially separated out of the film surface to play the roles of protection, lubrication and isolation; the wax with large molecular weight slowly separates out of the surface in the processes of later storage and use, and the two waxes can play a synergistic effect when used simultaneously, so that the performance of the material is improved.
In the invention, the thickness of the acrylic coating is preferably 0.5-1.5 μm, and more preferably 1.0 μm.
In the invention, the acrylic coating is compounded on the surface of one side of the PET base layer in a coating mode, and can be contacted and heat-sealed with a food packaging box made of PET materials after being dried and cured.
In the invention, the PET easy-to-tear film also comprises an anti-fog layer compounded on the surface of the acrylic coating.
The structural schematic diagram of the PET easy-to-tear film is shown in figure 1. Wherein, 1 is a BOPET film layer; 2 is an acrylic coating layer; and 3, an antifogging layer.
The antifogging agent of the antifogging layer of the present invention is not particularly limited, and any antifogging agent known to those skilled in the art may be used.
Preferably, the antifogging layer comprises the following components:
Figure BDA0003267823850000031
more preferably, the antifogging layer comprises the following components:
Figure BDA0003267823850000032
Figure BDA0003267823850000041
the diisocyanate is preferably hexamethylene diisocyanate.
The initiator is preferably a pivaloyl peroxypivalate initiator.
The catalyst is preferably a triethylenediamine catalyst.
The defoaming agent is preferably a DU-368 polyether defoaming agent.
In the invention, the thickness of the antifogging layer is preferably 0.3-1.0 μm, and more preferably 0.5 μm.
The invention provides a preparation method of the PET easy-uncovering film, which comprises the following steps:
s1) unwinding: unfolding the PET base layer film;
s2) acrylic coating: coating the acrylic coating on the surface of the PET base layer film through a coating roller;
s3) drying acrylic acid.
The tension of the unfolded PET base layer film is preferably 50-120N.
The unreeling process is preferably as follows: the PET base layer film roll is unfolded under the tension of 50-120N, the film roll continuously moves forwards through a plurality of guide rollers, two same stations are adopted to work alternately, automatic splicing and quick film changing are adopted, and the purpose of continuously unreeling and changing rolls is achieved.
Then, the acrylic coating is preferably applied to the surface of the PET base film by a reverse roll kiss coating method.
In the invention, the preferable coating weight of the acrylic acid is 2.0-4.0 g/m2。
In the invention, the coating speed of the acrylic acid is preferably 150-500 m/min.
And then drying the acrylic coating.
In the drying process, the film needs to have certain tension control, and the principle of the tension is to meet the requirement of straightening and leveling the film. Preferably, the tension is 40-120N.
Preferably, the acrylic acid drying is divided into a plurality of stages.
Preferably, the first stage is infrared drying. The temperature of infrared drying is preferably 110-140 ℃; the time is preferably 1.0 to 2.0 s.
The second stage and thereafter are preferably dried in an electric oven. The drying temperature is preferably 110-120 ℃; the time is preferably 3 to 8 seconds.
Preferably, the method further includes, after step S3):
s4) antifogging agent coating: coating the antifogging agent on the surface of the acrylic coating through a coating roller;
s5) drying the antifogging agent.
Specifically, the antifogging agent is coated on the surface of the acrylic coating by a reverse roll kiss coating roll.
The coating weight of the antifogging agent is preferably 1.0-3.0 g/m2(ii) a The coating speed is preferably 150 to 500 m/min.
In the drying process, the film needs to have certain tension control, and the principle of the tension is to meet the requirement of straightening and leveling the film. Preferably, the tension is 40-120N.
Preferably, the drying step of the antifogging agent is divided into a plurality of sections.
The first stage is preferably infrared drying. The temperature of infrared drying is preferably 110-130 ℃; the time is preferably 2.0 to 5.0 s.
The second stage and thereafter are preferably dried in an electric oven. The drying temperature is preferably 100-120 ℃, and more preferably 110 ℃; the time is preferably 7 to 20 s.
Preferably, the drying of the electric heating oven is divided into 3-5 sections, and the temperature is preferably set in a descending manner.
In one embodiment of the invention, the temperature of the second stage drying is 110-120 ℃, the temperature of the third stage drying is 100-110 ℃, and the total drying time is preferably 7-20 seconds.
Preferably, the method further includes, after step S5):
and (4) online detection, rolling and curing.
The online detection is preferably as follows: the method is characterized in that the working principle of on-line image scanning of a camera is adopted, when the production line is in high-speed production, a light source is adopted to irradiate the surface of a product, meanwhile, the camera scans and collects the image of the product irradiated by the light source in real time, the collected image is processed and segmented, and a mark is recorded, the camera is preferably a CCD industrial camera, and the light source is preferably a high-brightness LED linear light-gathering light source and is used for judging the quality and the drying condition of the product.
The rolling is preferably as follows: the coated product is rolled, the rolling tension and the pressure of a compression roller are required to be controlled during rolling, the tension and the pressure applied during rolling are reduced from small to large, an optimal attenuation rate is obtained during the process, and the process needs to be finely set according to a base material film, the coating amount, the film width, the film thickness and the like. Preferably, the winding tension is 50-110N, and the pressure of the compression roller is 3.0 +/-2 kg.
The curing is preferably specifically: and (5) curing at normal temperature. The curing time is preferably 2 days.
The PET easy-to-uncover film provided by the invention does not need high-temperature curing, and the phenomenon that the film is easy to be bonded or has other appearance defects at high temperature is avoided.
According to the invention, the PET film is coated with acrylic acid and then coated with the antifogging agent to form the blocking and antifogging PET film, so that various defects of the PET box sealing cover manufactured by a film coating mode are overcome.
Compared with the prior art, the invention provides a PET easy-to-tear film which comprises a PET base layer and an acrylic coating compounded on the surface of the PET base layer.
The PET easy-uncovering film provided by the invention has the following advantages:
1. the heat sealing strength is moderate; the PET easy-release film provided by the invention is used for heat sealing with a PET box under the heat sealing condition of 160 ℃ at 0.14MPa at 1S, and the coating weight of coating acrylic acid is controlled (the coating weight is 2.0-4.0 g/m)2) The heat-seal strength is controlled within the range of 2.0-4.0N, the heat-seal strength within the range can guarantee the sealing capacity of the box cover, opening of the box cover can be easily achieved when the cover is opened, and the cover is easy to uncover. Experimental results show that the heat sealing strength of the PET easy-to-tear film and the PET box provided by the invention is more than or equal to 2.5N/15 mm.
2. Excellent barrier effect, acrylic acid have excellent barrier smell function, have guaranteed that the fresh fruit of splendid attire is kept in together and can not taint with the smell each other.
3. The transparency is high, the cold antifogging effect is good, and the experimental result shows that the haze is as follows: 5.43%, gloss: 89.9 percent. The cold antifogging effect can achieve the effect that water mist and water drops are not condensed on the film surface completely, and the problem that the packaged fresh vegetables and fresh vegetables are frozen in a freezer, and the temperature difference between the cold temperature and the hot temperature leads to the fogging phenomenon of the packaging box is solved. When the packing box is purchased, a consumer can easily see the state of the real object in the packing box, and the purchasing desire of the consumer is enhanced.
4. The base material of the film is PET, and the material of the box is also PET, so that the film meets the requirement of recycling the same material according to the environmental protection requirement.
Drawings
Fig. 1 is a schematic structural diagram of a PET easy-release film provided by the invention.
Detailed Description
In order to further illustrate the present invention, the following will describe the PET release film and the method for manufacturing the same in detail with reference to examples.
Example 1
1) Preparing acrylic emulsion:
Figure BDA0003267823850000071
in the mixed emulsifier, the mass ratio of the secondary alkane sulfonic acid sodium to the polyethylene glycol nonionic surfactant is 2: 1.
2) The antifogging agent coating is prepared from the following raw materials:
Figure BDA0003267823850000072
Figure BDA0003267823850000081
1. preparation of raw materials:
(1) adding 6kg of soft water into a mixing tank, adding the weighed emulsifier, starting the stirring function, fully stirring, dissolving and mixing to prepare an emulsifier mixed solution.
(2) Adding 3kg of soft water into a material preparation tank, adding the weighed initiator, starting a stirring function, fully stirring, dissolving and mixing to prepare an initiator mixed solution.
(3) Adding the rest soft water into a reaction kettle, adding the weighed ethylene-acrylic acid copolymer, amino resin and maleic anhydride tackifier, closing each inlet and outlet valve of the reaction kettle, starting a vacuum pump to vacuumize the reaction kettle, and starting a stirring and heating device when the vacuum pumping reaches-0.01 MPa, wherein the stirring speed is 130r/min and the temperature is 85 ℃. After preserving the heat for one hour, continuously dropwise adding the prepared emulsifier and initiator by a metering pump, and controlling the dropwise adding within 3 hours.
(4) After the addition, the mixture is kept at the temperature of 85 ℃ for 1 hour, and then the antifoaming agent, the PH regulator and the SiO are added2Release agent, palm wax and ML-180 wax emulsion. Then cooling, standing and filtering to obtain the acrylic emulsion of the invention.
2. Production of coating film:
(1) unreeling: unfolding a PET substrate film;
(2) corona treatment: the PET substrate is subjected to corona treatment by a corona treatment machine with the power of 8.2 KW.
(3) Coating on acrylic acid: in unwindingThe acrylic emulsion is coated on the corona surface of a PET substrate by a reverse kiss roll mode at the speed of 202m/min and the tension of 80N, and the theoretical coating weight is 2.8g/m2。
(4) And (4) drying acrylic acid, namely drying the acrylic acid emulsion through a multi-section drying oven.
The first stage is infrared drying, the temperature of the infrared drying is 140 ℃, and the time is 2.0 s;
and drying in a second section of electric heating oven at 120 ℃ for 3.0 s.
And drying in a third section of electric heating oven at the temperature of 110 ℃ for 2.0 s.
(5) Coating an antifogging agent: the antifog agents were also applied to the acrylic coating surface by means of a kiss roll. The theoretical coating weight of the antifogging agent is 0.5g/m2The speed of the coating roller was 230 m/min.
(6) And (5) drying the antifogging agent.
The drying step of the antifogging agent is divided into a plurality of sections:
a first stage: infrared drying, wherein the temperature of the infrared drying is 130 ℃, and the time is 2 s;
and a second stage: drying in an electric heating oven at 120 ℃ for 3 s;
a third stage: drying in an electric heating oven at the temperature of 110 ℃ for 2 s;
a third stage: drying in an electric heating oven at 100 ℃ for 2 s;
(7) the subsequent steps comprise online detection, rolling, rewinding and curing.
And detecting to obtain: the coating weight was 3.2g/m2The heat sealing strength of the coating film and a PET box is 3.8N/15mm, and the cold-hot antifogging effect is excellent.
Example 2
1) Preparing acrylic emulsion:
Figure BDA0003267823850000091
in the mixed emulsifier, the mass ratio of the secondary alkane sulfonic acid sodium to the polyethylene glycol nonionic surfactant is 2: 1.
2) the antifogging agent coating is prepared from the following raw materials:
Figure BDA0003267823850000092
Figure BDA0003267823850000101
1. preparation of raw materials:
(1) adding 6.0kg of soft water into a mixing tank, adding the weighed emulsifier, starting the stirring function, and fully stirring, dissolving and mixing to prepare an emulsifier mixed solution.
(2) Adding 3.8kg of soft water into a batching tank, adding weighed initiator, starting stirring function, fully stirring, dissolving and mixing to prepare initiator mixed solution.
(3) Adding the rest soft water into a reaction kettle, adding the weighed ethylene-acrylic acid copolymer, amino resin and maleic anhydride tackifier, closing each inlet and outlet valve of the reaction kettle, starting a vacuum pump to vacuumize the reaction kettle, and starting a stirring and heating device when the vacuum is pumped to-0.01 MPa, wherein the stirring speed is 130r/min and the temperature is 85 ℃. After preserving the heat for one hour, continuously dropwise adding the prepared emulsifier and initiator by a metering pump, and controlling the dropwise adding within 3 hours.
(4) After the addition, the mixture is kept at the temperature of 85 ℃ for 1 hour, and then the antifoaming agent, the PH regulator and the SiO are added2Release agent, palm wax and ML-180 wax emulsion. Then cooling, standing and filtering to obtain the acrylic emulsion of the invention.
2. Production of coating film:
(1) unreeling: unfolding a PET substrate film;
(2) corona treatment: and (3) carrying out corona treatment on the PET substrate by a corona treatment machine with the power of 8.3 KW.
(3) Acrylic acid coating: speed of unwindingCoating the acrylic emulsion on the corona surface of a PET substrate by a reverse kiss roll mode at a tension of 85N under 201m/min, wherein the theoretical coating weight is 2.2g/m2。
(4) Drying the acrylic acid emulsion by a multi-stage drying oven.
The first stage is infrared drying, the temperature of the infrared drying is 140 ℃, and the time is 2.0 s;
and drying in a second section of electric heating oven at 120 ℃ for 3.0 s.
And drying in a third section of electric heating oven at the temperature of 110 ℃ for 2.0 s.
(5) Coating an antifogging agent: the antifog agents were also applied to the acrylic coating surface by means of a kiss roll. The coating weight of the theoretical antifogging agent is 0.5g/m2The speed of the coating roller was 225 m/min.
(6) And (5) drying the antifogging agent.
The drying step of the antifogging agent is divided into a plurality of sections:
a first stage: infrared drying, wherein the temperature of the infrared drying is 130 ℃, and the time is 2 s;
and a second stage: drying in an electric heating oven at 115 ℃ for 4 s;
a third stage: drying in an electric heating oven at 115 ℃ for 3 s;
a third stage: drying in an electric heating oven at 105 ℃ for 2 s;
(7) the subsequent steps comprise online detection, rolling, rewinding and curing.
And detecting to obtain: the coating weight was 2.6g/m2The heat sealing strength of the coating film and a PET box is 3.2N/15mm, and the cold-hot antifogging effect is excellent.
Example 3
1) Preparing acrylic emulsion:
Figure BDA0003267823850000111
Figure BDA0003267823850000121
in the mixed emulsifier, the mass ratio of the secondary alkane sulfonic acid sodium to the polyethylene glycol nonionic surfactant is 2: 1.
2) The antifogging agent coating is prepared from the following raw materials:
Figure BDA0003267823850000122
1. preparation of raw materials:
(1) adding 7.2kg of soft water into a mixing tank, adding the weighed emulsifier, starting the stirring function, and fully stirring, dissolving and mixing to prepare an emulsifier mixed solution.
(2) Adding 4.2kg of soft water into a batching tank, adding weighed initiator, starting stirring function, fully stirring, dissolving and mixing to prepare initiator mixed solution.
(3) Adding the rest soft water into a reaction kettle, adding the weighed ethylene-acrylic acid copolymer, amino resin and maleic anhydride tackifier, closing each inlet and outlet valve of the reaction kettle, starting a vacuum pump to vacuumize the reaction kettle, and starting a stirring and heating device when the vacuum is pumped to-0.01 MPa, wherein the stirring speed is 130r/min and the temperature is 85 ℃. After preserving the heat for one hour, continuously dropwise adding the prepared emulsifier and initiator by a metering pump, and controlling the dropwise adding within 3 hours.
(4) After the addition, the mixture is kept at the temperature of 85 ℃ for 1 hour, and then the antifoaming agent, the PH regulator and the SiO are added2Release agent, palm wax and ML-180 wax emulsion. Then cooling, standing and filtering to obtain the acrylic emulsion of the invention.
2. Production of coating film:
(1) unreeling: unfolding a PET substrate film;
(2) corona treatment: and (4) carrying out corona treatment on the PET substrate by a corona treatment machine with the power of 8 KW.
(3) Acrylic acid coating: at an unwinding speed of 200Coating the acrylic emulsion on the corona surface of a PET substrate in a reverse kiss roll mode under the tension of 80N at m/min, wherein the theoretical coating weight is 2.3g/m2。
(4) Drying the acrylic acid emulsion by a multi-stage drying oven.
The first stage is infrared drying, the temperature of the infrared drying is 140 ℃, and the time is 2.0 s;
and drying in a second section of electric heating oven at 120 ℃ for 3.0 s.
And drying in a third section of electric heating oven at 115 ℃ for 2.0 s.
(5) Coating an antifogging agent: the antifog agents were also applied to the acrylic coating surface by means of a kiss roll. The coating weight of the antifogging agent is 0.5g/m2The speed of the coating roller was 220 m/min.
(6) And (5) drying the antifogging agent.
The drying step of the antifogging agent is divided into a plurality of sections:
a first stage: infrared drying, wherein the temperature of the infrared drying is 130 ℃, and the time is 2 s;
and a second stage: drying in an electric heating oven at 120 ℃ for 3 s;
a third stage: drying in an electric heating oven at 115 ℃ for 2 s;
a third stage: drying in an electric heating oven at the temperature of 110 ℃ for 2 s;
(7) the subsequent steps comprise online detection, rolling, rewinding and curing.
And detecting to obtain: the coating weight was 2.9g/m2The heat sealing strength of the coating film and a PET box is 3.4N/15mm, and the cold-hot antifogging effect is excellent.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (10)

1. A PET easy-to-tear film comprises a PET base layer and an acrylic coating compounded on the surface of the PET base layer.
2. The PET release film of claim 1, wherein the PET base layer is BOPET.
3. The PET release film of claim 1, wherein the acrylic coating comprises, in weight percent:
Figure FDA0003267823840000011
the first palm wax has a lower molecular weight than the second palm wax.
4. A PET release film according to claim 3, wherein the initiator is selected from sodium persulfate;
the defoaming agent is selected from polyether defoaming agents;
the pH regulator is selected from multifunctional amine pH regulators.
5. The PET release film of claim 1, further comprising an anti-fog layer compounded on the surface of the acrylic coating.
6. The PET release film of claim 5, wherein the antifogging layer comprises:
Figure FDA0003267823840000012
Figure FDA0003267823840000021
7. the method for preparing the PET release film of any one of claims 1 to 6, comprising the steps of:
s1) unwinding: unfolding the PET base layer film;
s2) acrylic coating: coating the acrylic coating on the surface of the PET base layer film through a coating roller;
s3) drying acrylic acid.
8. The production method according to claim 7, wherein the tension of the developed PET base layer film is 50 to 120N;
in the step S2), the coating weight of acrylic acid is 2.0-4.0 g/m2The coating speed is 150-500 m/min;
the acrylic acid drying is divided into a plurality of sections;
the first stage is infrared drying, wherein the temperature of the infrared drying is 110-140 ℃, and the time is 1.0-2.0 s;
and the second section and the subsequent second section are dried by an electric heating oven at the temperature of 110-120 ℃ for 3-8 s.
9. The method according to claim 7, further comprising, after step S3):
s4) antifogging agent coating: coating the antifogging agent on the surface of the acrylic coating through a coating roller;
s5) drying the antifogging agent.
10. The method according to claim 9, wherein the amount of the antifogging agent applied in step S4) is 1.0 to 3.0g/m2The coating speed is 150-500 m/min;
the drying step of the antifogging agent is divided into a plurality of sections;
the first stage is infrared drying, wherein the temperature of the infrared drying is 110-130 ℃, and the time is 2.0-5.0 s;
and the second section and the subsequent second section are dried by an electric heating oven at the temperature of 100-120 ℃ for 7-20 s.
CN202111092309.4A 2021-09-17 2021-09-17 PET easy-to-tear film and preparation method thereof Pending CN113788973A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
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JP2020104944A (en) * 2018-12-25 2020-07-09 南亞塑膠工業股▲分▼有限公司 Antifogging packing bag for fruits and vegetables
CN113265195A (en) * 2021-05-21 2021-08-17 海南赛诺实业有限公司 PET heat-sealing film coating antifogging agent, PET antifogging easy-to-uncover film and preparation method and application thereof

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CN108176573A (en) * 2017-12-21 2018-06-19 海南赛诺实业有限公司 A kind of low-temperature heat-sealing coated film and its manufacturing method
JP2020104944A (en) * 2018-12-25 2020-07-09 南亞塑膠工業股▲分▼有限公司 Antifogging packing bag for fruits and vegetables
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Application publication date: 20211214