CN112300426A - Preparation method of polypropylene film layer capable of eliminating stress residue - Google Patents
Preparation method of polypropylene film layer capable of eliminating stress residue Download PDFInfo
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- CN112300426A CN112300426A CN202011156587.7A CN202011156587A CN112300426A CN 112300426 A CN112300426 A CN 112300426A CN 202011156587 A CN202011156587 A CN 202011156587A CN 112300426 A CN112300426 A CN 112300426A
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- -1 polypropylene Polymers 0.000 title claims abstract description 102
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 86
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 84
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000011347 resin Substances 0.000 claims abstract description 35
- 229920005989 resin Polymers 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 30
- 239000000203 mixture Substances 0.000 claims abstract description 27
- 238000000137 annealing Methods 0.000 claims abstract description 26
- 238000001035 drying Methods 0.000 claims abstract description 26
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 18
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 18
- 238000005520 cutting process Methods 0.000 claims abstract description 16
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 15
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 15
- 239000000314 lubricant Substances 0.000 claims abstract description 15
- 239000004014 plasticizer Substances 0.000 claims abstract description 15
- 238000003851 corona treatment Methods 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 238000007493 shaping process Methods 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 238000005266 casting Methods 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 7
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
- C08J7/08—Heat treatment
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- 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
- C08J7/12—Chemical modification
- C08J7/123—Treatment by wave energy or particle radiation
-
- 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
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
-
- 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
- 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
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/12—Polypropene
-
- 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
- C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2427/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2427/18—Homopolymers or copolymers of tetrafluoroethylene
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- Chemical & Material Sciences (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses a preparation method of a polypropylene film layer for eliminating stress residue, which comprises the following specific steps: s1, crushing the leftover materials of the polypropylene film, adding polypropylene resin and a plasticizer, and drying; s2, putting the mixture into a high-speed mixer, adding polytetrafluoroethylene resin, an antioxidant and a lubricant, and uniformly stirring; s3, extruding and casting the mixture into sheets; s4, cooling, shaping and carrying out biaxial tension; s5, annealing, drying and cutting edges; and S6, carrying out double-sided corona treatment, rolling and cutting to obtain a finished product. The invention eliminates the internal stress of the polypropylene film layer through annealing treatment, can also improve the strength and toughness of the polypropylene film layer, and recycles the waste polypropylene film leftover materials.
Description
Technical Field
The invention relates to the field of preparation of high polymer material polypropylene films, in particular to a preparation method of a polypropylene film layer capable of eliminating stress residues.
Background
Polypropylene PP is a polymer, an organic substance, formed by the polyaddition of propylene. Is white wax-like material, and has transparent and light appearance. The chemical formula is (C3H6) x, the density is 0.89-0.91 g/cm3, the material is flammable, the melting point is 165 ℃, the material is softened at about 155 ℃, and the use temperature range is-30-140 ℃. Can resist corrosion of acid, alkali, salt solution and various organic solvents at the temperature of below 80 ℃, and can be decomposed at high temperature and under the action of oxidation. The polypropylene is widely applied to the production of fiber products such as clothes, blankets and the like, medical instruments, automobiles, bicycles, parts, conveying pipelines, chemical containers and the like, and is also used for packaging foods and medicines.
The PP film prepared from the polypropylene as one of general plastics is transparent, light in weight, one of the lightest resin varieties, can float on water, is reinforced by glass fibers or minerals, can obtain higher strength and rigidity, has good dimensional stability, is convenient to machine and form, and has the advantages that in the processing process of the polypropylene material, on one hand, the internal stress is not easy to eliminate, and a large amount of waste polypropylene film leftover materials cannot be well recycled, on the other hand, the requirements on the performance of the polypropylene material are increasingly enhanced, and particularly the requirements on the strength and the toughness are met.
The mechanical properties of the material refer to the properties of deformation, flow and damage of the material under the action of external force, and the quantity of basic mechanical properties of the reaction material mainly comprises two types; one is the amount of deformation of the reactive material, such as modulus or softness, Poisson's ratio; another category is the amount of reactive material failure process, such as the effects of rate limiting, tensile strength, tensile yield, tensile failure, and the like. The dependence of stress on the action time is one of the main characteristics of polymer materials, and the stress relaxation behavior of the polymer with shorter action time at higher temperature is consistent with the stress relaxation behavior with longer action time at lower temperature. Because the composite film layer is not plasticized uniformly in the forming process or has different cooling speeds in a die cavity, the product has internal stress, and the product with the internal stress is often reduced in mechanical property, deteriorated in optical property and even deformed and cracked in storage and use.
Therefore, in combination with the above problems, it is an urgent need to solve the above problems by those skilled in the art to provide a method for preparing a polypropylene film layer capable of eliminating stress residue.
Disclosure of Invention
In view of the above, the invention provides a preparation method of a polypropylene film layer for eliminating stress residue, which eliminates the internal stress of the polypropylene film layer through annealing treatment, adds polytetrafluoroethylene resin and polypropylene film leftover materials, improves the strength and toughness of the polypropylene film layer, and recycles the waste polypropylene film leftover materials.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of a polypropylene film layer for eliminating stress residue comprises the following specific steps:
s1, crushing the leftover materials of the polypropylene film into particles with the particle size less than or equal to 1cm, adding the particles into a polypropylene resin and plasticizer dryer for drying treatment, setting the temperature at 100 ℃ and 105 ℃, and drying for 6-7 h;
s2, weighing the mixture, placing the mixture into a high-speed mixer, adding polytetrafluoroethylene resin, an antioxidant and a lubricant, stirring and mixing, setting the temperature to be 60-80 ℃, and uniformly mixing for 4-5 min;
s3, putting the mixture obtained in the step S2 into a double-screw extruder, setting the temperature for melting and plasticizing to be 270-285 ℃, and extruding casting sheets;
s4, the cast sheet obtained in the step S3 enters a cold roll for shaping, the cooling temperature is 50 ℃, and the obtained cast sheet is put into a biaxial stretching machine for longitudinal stretching and transverse stretching, wherein the longitudinal stretching is 3.5-3.8 times, and the transverse stretching is 4-5 times;
s5, annealing the film obtained in the step S4 for 10-30min at the annealing temperature of 140-150 ℃, finishing the annealing, placing the film into an oven to dry for 2-3h, cutting edges of the film after drying, and removing thick edges which are not uniformly stretched;
and S6, performing double-sided corona treatment on the film obtained in the step S5, rolling the film to obtain a mother roll of the polypropylene film, and cutting the mother roll according to the required specification to obtain the finished polypropylene film.
Preferably, the rotation speed is set to 110-120rpm in the step S2.
Preferably, the temperature of the twin-screw extruder set in the step S3 is 180-220 ℃, and the screw rotation speed is 420-460 rpm.
Preferably, the longitudinal stretching temperature is set to be 80-90 ℃ and the transverse stretching temperature is set to be 100-110 ℃ in the step S4.
Preferably, the surface energy of the film is 52 dynes through the corona treatment in step S6.
Preferably, the corona treatment is performed by using a high-frequency high-voltage power supply to generate corona, and the corona treatment is set to be 380 volts and 20 kHz.
The polypropylene film layer capable of eliminating stress residue is prepared according to the preparation method, and comprises the following components in parts by weight: polypropylene resin: 80-95 parts of polypropylene film leftover material: 10-15 parts of polytetrafluoroethylene resin: 0.8-1.2 parts of plasticizer: 0.5-1.5 parts of antioxidant: 0.8-1.3 parts of lubricant: 0.8 to 1.3 portions.
Preferably, the molecular weight of the polytetrafluoroethylene resin is 400-500 ten thousand.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the invention takes polypropylene as raw material, the leftover material obtained in the processes of starting, breaking and trimming the polypropylene film is recycled, the new polypropylene resin is crushed and added, a small amount of polytetrafluoroethylene resin is added, the strength and toughness of the polypropylene film are improved, the performance is excellent, the whole process is simple to operate, the production cost is reduced, the internal stress is eliminated by an annealing process, the stress-eliminating heating temperature is low, no structure transformation exists in the annealing process, the annealing treatment can relax the molecular chain which is forcedly frozen, and the solidified macromolecular chain segment turns to a random position, so that the internal stress of the part is eliminated, and the elongation at break is reduced. The residual stress in the polypropylene film layer can be eliminated, the film rolling phenomenon is reduced, and the use efficiency is improved.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment 1 of the invention discloses a preparation method of a polypropylene film layer for eliminating stress residue, which adopts the following technical scheme:
the polypropylene film layer comprises the following components in parts by weight: polypropylene resin: 80 parts of polypropylene film leftover material: 10 parts of polytetrafluoroethylene resin: 0.8 part of plasticizer: 0.5 part of antioxidant: 0.8 part of lubricant: 0.8 part.
S1, crushing the leftover materials of the polypropylene film into particles with the particle size less than or equal to 1cm, adding the particles into a polypropylene resin and plasticizer dryer for drying treatment, setting the temperature at 100 ℃ and 105 ℃, and drying for 6-7 h;
s2, weighing the mixture, placing the mixture into a high-speed mixer, adding polytetrafluoroethylene resin, an antioxidant and a lubricant, stirring and mixing the mixture, setting the temperature at 60 ℃ and the rotating speed at 110rpm, and uniformly mixing the mixture for 5 min;
s3, putting the mixture obtained in the step S2 into a double-screw extruder, setting the temperature of melting and plasticizing to be 270 ℃, the temperature of the double-screw extruder to be 180 ℃, the rotating speed of a screw to be 420rpm, and extruding cast pieces;
s4, the cast sheet obtained in the step S3 enters a cold roll for shaping, the cooling temperature is 50 ℃, the obtained cast sheet is put into a biaxial stretching machine for longitudinal stretching and transverse stretching, the longitudinal stretching is 3.5 times, the longitudinal stretching temperature is 80 ℃, the transverse stretching is 4 times, and the transverse stretching temperature is 100 ℃;
s5, annealing the film obtained in the step S4 for 10min at the annealing temperature of 150 ℃, finishing annealing, putting the film into an oven for drying for 2h, cutting edges of the film after drying, and removing uneven stretched thick edges;
and S6, carrying out double-sided corona treatment on the film obtained in the step S5, wherein the surface energy of the film is 52 dynes, rolling the film to obtain a mother roll of the polypropylene film layer, and cutting the mother roll according to the required specification to obtain the finished polypropylene film.
Example 2
The embodiment 2 of the invention discloses a preparation method of a polypropylene film layer for eliminating stress residue, which adopts the following technical scheme:
the polypropylene film layer comprises the following components in parts by weight: polypropylene resin: 95 parts of polypropylene film leftover material: 15 parts of polytetrafluoroethylene resin: 1.2 parts of plasticizer: 1.5 parts of antioxidant: 1.3 parts of lubricant: 1.3 parts.
S1, crushing the leftover materials of the polypropylene film into particles with the particle size less than or equal to 1cm, adding the particles into a polypropylene resin and plasticizer dryer for drying treatment, setting the temperature at 100 ℃ and 105 ℃, and drying for 6-7 h;
s2, weighing the mixture, placing the mixture into a high-speed mixer, adding polytetrafluoroethylene resin, an antioxidant and a lubricant, stirring and mixing, setting the temperature at 80 ℃ and the rotating speed at 120rpm, and uniformly mixing for 4 min;
s3, putting the mixture obtained in the step S2 into a double-screw extruder, setting the melting and plasticizing temperature to be 285 ℃, the temperature of the double-screw extruder to be 220 ℃, the screw rotating speed to be 460rpm, and extruding cast sheets;
s4, the cast sheet obtained in the step S3 enters a cold roll for shaping, the cooling temperature is 50 ℃, the obtained cast sheet is put into a biaxial stretching machine for longitudinal stretching and transverse stretching, the longitudinal stretching is 3.8 times, the longitudinal stretching temperature is 90 ℃, the transverse stretching is 5 times, and the transverse stretching temperature is 110 ℃;
s5, annealing the film obtained in the step S4 for 30min at the annealing temperature of 140 ℃, finishing annealing, putting the film into an oven for drying for 3h, cutting edges of the film after drying, and removing uneven stretched thick edges;
and S6, carrying out double-sided corona treatment on the film obtained in the step S5, wherein the surface energy of the film is 52 dynes, rolling the film to obtain a mother roll of the polypropylene film layer, and cutting the mother roll according to the required specification to obtain the finished polypropylene film.
Example 3
The embodiment 3 of the invention discloses a preparation method of a polypropylene film layer for eliminating stress residue, which adopts the following technical scheme:
the polypropylene film layer comprises the following components in parts by weight: polypropylene resin: 86 parts of polypropylene film leftover material: 12 parts of polytetrafluoroethylene resin: 0.9 part of plasticizer: 0.7 part of antioxidant: 0.9 part of lubricant: 0.9 part.
S1, crushing the leftover materials of the polypropylene film into particles with the particle size less than or equal to 1cm, adding the particles into a polypropylene resin and plasticizer dryer for drying treatment, setting the temperature at 100 ℃ and 105 ℃, and drying for 6-7 h;
s2, weighing the mixture, placing the mixture into a high-speed mixer, adding polytetrafluoroethylene resin, an antioxidant and a lubricant, stirring and mixing, setting the temperature to be 65 ℃ and the rotating speed to be 113rpm, and uniformly mixing for 4 min;
s3, putting the mixture obtained in the step S2 into a double-screw extruder, setting the temperature for melting and plasticizing to 275 ℃, the temperature of the double-screw extruder to 190 ℃, and the rotating speed of a screw to 440rpm, and extruding cast pieces;
s4, the cast sheet obtained in the step S3 enters a cold roll for shaping, the cooling temperature is 50 ℃, the obtained cast sheet is put into a biaxial stretching machine for longitudinal stretching and transverse stretching, the longitudinal stretching is 3.6 times, the longitudinal stretching temperature is 82 ℃, the transverse stretching is 4.3 times, and the transverse stretching temperature is 102 ℃;
s5, annealing the film obtained in the step S4 for 15min at the annealing temperature of 145 ℃, finishing annealing, placing the film into an oven to dry for 2h, cutting edges of the film after drying, and removing uneven stretched thick edges;
and S6, carrying out double-sided corona treatment on the film obtained in the step S5, wherein the surface energy of the film is 52 dynes, rolling the film to obtain a mother roll of the polypropylene film layer, and cutting the mother roll according to the required specification to obtain the finished polypropylene film.
Example 4
The embodiment 4 of the invention discloses a preparation method of a polypropylene film layer for eliminating stress residue, which adopts the following technical scheme:
the polypropylene film layer comprises the following components in parts by weight: polypropylene resin: 90 parts of polypropylene film leftover material: 13 parts of polytetrafluoroethylene resin: 1.0 part of plasticizer: 1.1 parts of antioxidant: 1.0 part of lubricant: 1.0 part.
S1, crushing the leftover materials of the polypropylene film into particles with the particle size less than or equal to 1cm, adding the particles into a polypropylene resin and plasticizer dryer for drying treatment, setting the temperature at 100 ℃ and 105 ℃, and drying for 6-7 h;
s2, weighing the mixture, placing the mixture into a high-speed mixer, adding polytetrafluoroethylene resin, an antioxidant and a lubricant, stirring and mixing, setting the temperature at 70 ℃ and the rotating speed at 115rpm, and uniformly mixing for 4.5 min;
s3, putting the mixture obtained in the step S2 into a double-screw extruder, setting the temperature of melting and plasticizing to be 280 ℃, the temperature of the double-screw extruder to be 200 ℃, the rotating speed of a screw to be 430rpm, and extruding cast pieces;
s4, the cast sheet obtained in the step S3 enters a cold roll for shaping, the cooling temperature is 50 ℃, the obtained cast sheet is put into a biaxial stretching machine for longitudinal stretching and transverse stretching, the longitudinal stretching is 3.7 times, the longitudinal stretching temperature is 85 ℃, the transverse stretching is 4.5 times, and the transverse stretching temperature is 105 ℃;
s5, annealing the film obtained in the step S4 for 20min at the annealing temperature of 143 ℃, finishing annealing, placing the film into an oven to dry for 2h, cutting edges of the film after drying, and removing thick edges which are not uniformly stretched;
and S6, carrying out double-sided corona treatment on the film obtained in the step S5, wherein the surface energy of the film is 52 dynes, rolling the film to obtain a mother roll of the polypropylene film layer, and cutting the mother roll according to the required specification to obtain the finished polypropylene film.
Example 5
The embodiment 5 of the invention discloses a preparation method of a polypropylene film layer for eliminating stress residue, which adopts the following technical scheme:
the polypropylene film layer comprises the following components in parts by weight: polypropylene resin: 92 parts of polypropylene film leftover material: 14 parts of polytetrafluoroethylene resin: 1.1 parts of plasticizer: 1.3 parts of antioxidant: 1.1 parts of lubricant: 1.1 parts.
S1, crushing the leftover materials of the polypropylene film into particles with the particle size less than or equal to 1cm, adding the particles into a polypropylene resin and plasticizer dryer for drying treatment, setting the temperature at 100 ℃ and 105 ℃, and drying for 6-7 h;
s2, weighing the mixture, placing the mixture into a high-speed mixer, adding polytetrafluoroethylene resin, an antioxidant and a lubricant, stirring and mixing the mixture, setting the temperature at 75 ℃ and the rotating speed at 118rpm, and uniformly mixing the mixture for 5 min;
s3, putting the mixture obtained in the step S2 into a double-screw extruder, setting the melting and plasticizing temperature to be 282 ℃, the temperature of the double-screw extruder to be 210 ℃, and the screw rotating speed to be 450rpm, and extruding cast sheets;
s4, the cast sheet obtained in the step S3 enters a cold roll for shaping, the cooling temperature is 50 ℃, the obtained cast sheet is put into a biaxial stretching machine for longitudinal stretching and transverse stretching, the longitudinal stretching temperature is 3.8 times, the longitudinal stretching temperature is 87 ℃, the transverse stretching temperature is 4.8 times, and the transverse stretching temperature is 106 ℃;
s5, annealing the film obtained in the step S4 for 25min at 147 ℃, drying the film in an oven for 3h after finishing annealing, cutting edges of the film after drying, and removing thick edges which are not uniformly stretched;
and S6, carrying out double-sided corona treatment on the film obtained in the step S5, wherein the surface energy of the film is 52 dynes, rolling the film to obtain a mother roll of the polypropylene film layer, and cutting the mother roll according to the required specification to obtain the finished polypropylene film.
Examples of the experiments
To further illustrate the beneficial effects of the technical scheme of the invention, the samples obtained in examples 1-5 were subjected to performance testing. The test results are shown in table 1 below.
TABLE 1
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Tensile strength MPa | 26.3 | 26.1 | 25.8 | 25.6 | 26.7 |
| Bending strength MPa | 33.1 | 33.2 | 32.9 | 32.7 | 33.3 |
| Flexural modulus MPa | 1127 | 1153 | 1131 | 1109 | 1146 |
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A preparation method of a polypropylene film layer for eliminating stress residue is characterized by comprising the following specific steps:
s1, crushing the leftover materials of the polypropylene film into particles with the particle size less than or equal to 1cm, adding the particles into a polypropylene resin and plasticizer dryer for drying treatment, setting the temperature at 100 ℃ and 105 ℃, and drying for 6-7 h;
s2, weighing the mixture, placing the mixture into a high-speed mixer, adding polytetrafluoroethylene resin, an antioxidant and a lubricant, stirring and mixing, setting the temperature to be 60-80 ℃, and uniformly mixing for 4-5 min;
s3, putting the mixture obtained in the step S2 into a double-screw extruder, setting the temperature for melting and plasticizing to be 270-285 ℃, and extruding casting sheets;
s4, the cast sheet obtained in the step S3 enters a cold roll for shaping, the cooling temperature is 50 ℃, and the obtained cast sheet is put into a biaxial stretching machine for longitudinal stretching and transverse stretching, wherein the longitudinal stretching is 3.5-3.8 times, and the transverse stretching is 4-5 times;
s5, annealing the film obtained in the step S4 for 10-30min at the annealing temperature of 140-150 ℃, finishing the annealing, placing the film into an oven to dry for 2-3h, cutting edges of the film after drying, and removing thick edges which are not uniformly stretched;
and S6, performing double-sided corona treatment on the film obtained in the step S5, rolling the film to obtain a mother roll of the polypropylene film, and cutting the mother roll according to the required specification to obtain the finished polypropylene film.
2. The method as claimed in claim 1, wherein the rotation speed of step S2 is set at 110-120 rpm.
3. The method as claimed in claim 1, wherein the temperature of the twin-screw extruder in step S3 is set to 180-220 ℃, and the screw speed is set to 420-460 rpm.
4. The method as claimed in claim 1, wherein the step S4 is performed at a longitudinal stretching temperature of 80-90 ℃ and a transverse stretching temperature of 100-110 ℃.
5. The method as claimed in claim 1, wherein the surface energy of the film is 52 dynes by performing corona treatment in step S6.
6. The polypropylene film layer for eliminating stress residue is characterized by being prepared according to the preparation method of claim 1, and the polypropylene film layer comprises the following components in parts by weight: polypropylene resin: 80-95 parts of polypropylene film leftover material: 10-15 parts of polytetrafluoroethylene resin: 0.8-1.2 parts of plasticizer: 0.5-1.5 parts of antioxidant: 0.8-1.3 parts of lubricant: 0.8 to 1.3 portions.
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