CN112194839A - High-strength PE cast film and preparation method thereof - Google Patents
High-strength PE cast film and preparation method thereof Download PDFInfo
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- CN112194839A CN112194839A CN202010985940.6A CN202010985940A CN112194839A CN 112194839 A CN112194839 A CN 112194839A CN 202010985940 A CN202010985940 A CN 202010985940A CN 112194839 A CN112194839 A CN 112194839A
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- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000004698 Polyethylene Substances 0.000 claims abstract description 60
- 239000002994 raw material Substances 0.000 claims abstract description 38
- 239000004712 Metallocene polyethylene (PE-MC) Substances 0.000 claims abstract description 14
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 11
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 11
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 11
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 11
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 11
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 11
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 claims abstract description 11
- QZCLKYGREBVARF-UHFFFAOYSA-N Acetyl tributyl citrate Chemical compound CCCCOC(=O)CC(C(=O)OCCCC)(OC(C)=O)CC(=O)OCCCC QZCLKYGREBVARF-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 10
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 10
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 9
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 10
- 238000004049 embossing Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 7
- 238000007774 anilox coating Methods 0.000 claims description 6
- 238000003851 corona treatment Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 229920000570 polyether Polymers 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 239000012856 weighed raw material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- OXDXXMDEEFOVHR-CLFAGFIQSA-N (z)-n-[2-[[(z)-octadec-9-enoyl]amino]ethyl]octadec-9-enamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)NCCNC(=O)CCCCCCC\C=C/CCCCCCCC OXDXXMDEEFOVHR-CLFAGFIQSA-N 0.000 claims description 3
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims description 3
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 claims description 3
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 claims description 3
- FATBGEAMYMYZAF-UHFFFAOYSA-N oleicacidamide-heptaglycolether Natural products CCCCCCCCC=CCCCCCCCC(N)=O FATBGEAMYMYZAF-UHFFFAOYSA-N 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000741 silica gel Substances 0.000 claims description 2
- 229910002027 silica gel Inorganic materials 0.000 claims description 2
- CINROOONPHQHPO-UHFFFAOYSA-N tolpropamine Chemical compound C=1C=C(C)C=CC=1C(CCN(C)C)C1=CC=CC=C1 CINROOONPHQHPO-UHFFFAOYSA-N 0.000 claims description 2
- 229960000737 tolpropamine Drugs 0.000 claims description 2
- 238000009966 trimming Methods 0.000 claims description 2
- 210000002469 basement membrane Anatomy 0.000 abstract 1
- 238000007766 curtain coating Methods 0.000 abstract 1
- 210000004379 membrane Anatomy 0.000 abstract 1
- 239000012528 membrane Substances 0.000 abstract 1
- 239000002861 polymer material Substances 0.000 abstract 1
- 238000005266 casting Methods 0.000 description 26
- 239000000853 adhesive Substances 0.000 description 11
- 230000001070 adhesive effect Effects 0.000 description 11
- 238000005520 cutting process Methods 0.000 description 3
- 239000013530 defoamer Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920013716 polyethylene resin Polymers 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005411 Van der Waals force Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- FACXGONDLDSNOE-UHFFFAOYSA-N buta-1,3-diene;styrene Chemical compound C=CC=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 FACXGONDLDSNOE-UHFFFAOYSA-N 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- -1 polyethylenes Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007348 radical reaction Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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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
- 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
- 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
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
-
- 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
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
-
- 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
- C08J2453/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2453/02—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers of vinyl aromatic monomers and conjugated dienes
-
- 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
- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/10—Block- or graft-copolymers containing polysiloxane sequences
- C08J2483/12—Block- or graft-copolymers containing polysiloxane sequences containing polyether sequences
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/11—Esters; Ether-esters of acyclic polycarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/20—Carboxylic acid amides
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- Chemical & Material Sciences (AREA)
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- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of high polymer materials, and provides a high-strength PE cast film and a preparation method thereof, wherein the high-strength PE cast film comprises the following raw materials in parts by weight: 15-25 parts of high-pressure low-density polyethylene, 40-60 parts of low-pressure high-density polyethylene, 65-85 parts of linear low-density polyethylene, 10-15 parts of metallocene polyethylene, 9-18 parts of white master batch, 0.5-2 parts of defoaming agent, 0.1-0.8 part of slipping agent, 1-3 parts of antioxidant, 2-4 parts of acetyl tributyl citrate and 8-15 parts of styrene-butadiene-styrene block copolymer. It solves the problem that prior art leak protection basement membrane tensile strength and elongation at break are not enough, PE curtain coating membrane still has good adhesion and peel off nature, can directly with about sticky type paste the bonding, need not to use preceding waist to paste, has simplified panty-shape diapers's production processes, has improved the suitability of product.
Description
Technical Field
The invention relates to the technical field of cast films, in particular to a high-strength PE cast film and a preparation method thereof.
Background
The prior paper diaper is generally formed by compounding a surface layer, an absorption core body, a leakage-proof bottom film, a leakage-proof separation edge, a leg-surrounding rubber band, a protective rubber band, an elastic waistline, a left paste and a right paste and a front waist paste, and the left paste and the right paste are stuck on the front waist paste when in use, so that the front side and the rear side of the paper diaper are connected into a whole to form a 'trousers' shape. The left and right stickers can be bonded with the front waist sticker in a mode of matching magic buckles and magic tapes, and the left and right stickers can also be glued to directly bond with the front waist sticker made of non-woven fabrics to realize fixed bonding. The PE casting film is commonly used as a leakage-proof bottom film, but the tensile strength and the elongation at break of the PE casting film are insufficient, and if the PE casting film is directly bonded with the adhesive left and right stickers, the bottom film is easy to tear when being torn, so that the front waist sticker needs to be compounded on the outer surface of the leakage-proof bottom film; in addition, the insufficiency of mechanical property also causes the PE cast film to be easy to rub with equipment in the production process to generate broken holes, and the PE cast film has the risk of leakage after being applied to paper diapers.
Disclosure of Invention
Therefore, aiming at the content, the invention provides the high-strength PE casting film and the preparation method thereof, the prepared PE casting film has excellent performance, and is applied to the leakproof bottom film of the paper diaper to solve the problem that the prior leakproof bottom film has insufficient tensile strength and elongation at break.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a high-strength PE cast film comprises the following raw materials in parts by weight: 15-25 parts of high-pressure low-density polyethylene, 40-60 parts of low-pressure high-density polyethylene, 65-85 parts of linear low-density polyethylene, 10-15 parts of metallocene polyethylene, 9-18 parts of white master batch, 0.5-2 parts of defoaming agent, 0.1-0.8 part of slipping agent, 1-3 parts of antioxidant, 2-4 parts of acetyl tributyl citrate and 8-15 parts of styrene-butadiene-styrene block copolymer.
The further improvement is that: the feed comprises the following raw materials in parts by weight: 20 parts of high-pressure low-density polyethylene, 50 parts of low-pressure high-density polyethylene, 75 parts of linear low-density polyethylene, 12.5 parts of metallocene polyethylene, 9 parts of white master batch, 1 part of defoaming agent, 0.4 part of slipping agent, 2 parts of antioxidant, 4 parts of acetyl tributyl citrate and 8 parts of styrene-butadiene-styrene block copolymer.
The further improvement is that: the metallocene polyethylene is Exxon Mobil exposedTM1018HA or pragman SP 1520.
The further improvement is that: the slipping agent is any one of oleamide, ethylene bisoleamide and erucamide, and the defoaming agent is a polyether modified silicon defoaming agent.
The invention also provides a preparation method of the high-strength PE casting film, which comprises the following steps:
(1) weighing the raw materials according to the predetermined weight part for later use;
(2) uniformly stirring and mixing the weighed raw materials by a stirrer, then sending the raw materials into a double-screw extruder for melting and plasticizing, extruding the raw materials from a flat seam die orifice of a T-shaped die head, and cooling the raw materials by a cooling roller to form a film;
(3) and (3) stretching, corona and embossing the film obtained in the step (2), and finally trimming and rolling to obtain the PE cast film.
The further improvement is that: drying the raw materials in the step (1) before weighing, wherein the drying temperature is controlled to be 85-95 ℃.
The further improvement is that: in the step (2), the temperature of the T-shaped die is 200-210 ℃, the temperature of each section in the double-screw extruder is 175-185 ℃, 185-195 ℃, 200-210 ℃ and 190-200 ℃, and the temperature of the cooling roll is 18-25 ℃.
The further improvement is that: and (4) in the step (3), the dyne value of the film after corona treatment is 36-38.
The further improvement is that: in the step (3), the stretching temperature is 90-100 ℃, the stretching ratio is 1.6-2.0, and the stretching speed is 150-200 mm/min.
The further improvement is that: and (3) embossing is formed by passing the film through a gap between an anilox roller and a silica gel roller, wherein the mesh number of the anilox roller is 120-170 meshes.
By adopting the technical scheme, the invention has the beneficial effects that:
the invention optimizes the weight proportion of each raw material, takes polyethylene resins with different structures as main raw materials, adds a plurality of additives in an auxiliary way, and prepares the PE casting film with high strength through the procedures of casting film forming, stretching, corona, embossing and the like. The PE casting film comprises the following raw materials in parts by weight: 15-25 parts of high-pressure low-density polyethylene, 40-60 parts of low-pressure high-density polyethylene, 65-85 parts of linear low-density polyethylene, 10-15 parts of metallocene polyethylene, 9-18 parts of white master batch, 0.5-2 parts of defoaming agent, 0.1-0.8 part of slipping agent, 1-3 parts of antioxidant, 2-4 parts of acetyl tributyl citrate and 8-15 parts of styrene-butadiene-styrene block copolymer. The left and right adhesive stickers in the paper diaper have good adhesive holding force and lower 90-degree peel strength on the surface of the PE cast film prepared by the invention, and the large adhesive holding force means that the left and right adhesive stickers can be adhered to the surface of the PE cast film for a long time and are not easy to separate; the lower 90-degree peel strength can ensure that the left and right pastes can be easily separated from the PE cast film after use. The prepared PE casting film has good tensile strength and elongation at break, the problem that the surface of the PE casting film is scratched due to friction with equipment even in high-speed production is solved, and the PE casting film cannot be torn when the adhesive type left and right stickers are torn off. Therefore, when the PE casting film prepared by the invention is applied to the leakage-proof bottom film, a closed system is not needed to be formed by bonding the front waist tape and the left and right tapes as in the prior art, and the left and right tapes are directly bonded on the PE casting film, so that the production process of the paper diaper is simplified, and the production cost is reduced. Meanwhile, the left and right stickers can be bonded at any position of the PE cast film, and are not limited by the size of the front waist sticker, so that the applicability of the product is improved, and the requirements of different users can be met.
The high-pressure low-density polyethylene, the low-pressure high-density polyethylene, the linear low-density polyethylene and the metallocene polyethylene have different molecular chain configurations and different performances, and by utilizing the respective advantages of the high-pressure low-density polyethylene, the low-pressure high-density polyethylene, the linear low-density polyethylene and the metallocene polyethylene to carry out blending modification, a casting film with excellent comprehensive performance can be obtained, and meanwhile, the defects of the material when the material is used alone can be overcome. The addition of acetyl tributyl citrate in the raw material can weaken the Van der Waals force between polymer molecules and increase the phase between the polymer moleculesFor the motion capability, the crystallinity is reduced, and the flexibility of the PE casting film is enhanced. The styrene-butadiene-styrene segmented copolymer has excellent tensile strength and elasticity, and can be added into raw materials to modify polyethylene resin, reduce the crystallinity of the PE film and improve the flexibility of the PE film; the styrene-butadiene-styrene block copolymer can also promote the dispersibility of the white master batch in a system. The metallocene polyethylene is preferably Exxon Mobil exposedTM1018HA or Priman SP1520, cast PE films made with these two metallocene polyethylenes have excellent tensile strength, elongation at break.
Corona discharge is carried out on the surface of the film by high frequency and high voltage, so that free radical reaction is generated on the surface of the film, the polymer is crosslinked, molecules on the surface of the film are oxidized and polarized, a polar surface layer is formed, and the adhesive force between the film and the left and right pastes is improved. Preferably, the dyne value of the film after corona treatment is 36-38, and if the dyne value is too low, the adhesion is insufficient, and the film is easy to fall off in use; if the dyne value is too high, peeling after use is difficult. The film is embossed, certain lines are formed on the surface of the prepared PE casting film, and the stripping property of the PE casting film can be improved.
Detailed Description
The following detailed description will be provided for the embodiments of the present invention with reference to specific embodiments, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.
Unless otherwise indicated, the techniques employed in the examples are conventional and well known to those skilled in the art, and the reagents and products employed are also commercially available. The source, trade name and if necessary the constituents of the reagents used are indicated at the first appearance.
Example one
A high-strength PE cast film comprises the following raw materials in parts by weight: 20 parts of high-pressure low-density polyethylene, 50 parts of low-pressure high-density polyethylene, 75 parts of linear low-density polyethylene and 12.5 parts of metallocene polyethylene (Exxon Exceed)TM1018HA), 9 parts of white master batch (Dongguan gold plastic pigment)Produced by science and technology limited company, the mark is 10217), 1 part of polyether modified silicon defoamer, 0.4 part of oleamide, 1682 parts of antioxidant, 4 parts of acetyl tributyl citrate and 8 parts of styrene-butadiene-styrene block copolymer.
A preparation method of a high-strength PE casting film comprises the following steps:
(1) drying each raw material for 1h, controlling the drying temperature at 85 ℃, and then weighing each raw material according to the predetermined weight part for later use;
(2) uniformly stirring and mixing the weighed raw materials by a stirrer, then sending the raw materials into a double-screw extruder for melting and plasticizing, extruding the raw materials from a flat seam die orifice of a T-shaped die head, and cooling the raw materials by a cooling roller to form a film; wherein the temperature of each section in the double-screw extruder is 175 ℃, 185 ℃, 200 ℃, 190 ℃, the temperature of the T-shaped die head is 200 ℃, and the temperature of the cooling roller is 18 ℃.
(3) And (3) sequentially carrying out longitudinal stretching, corona and embossing treatment on the film obtained in the step (2), and finally cutting edges and rolling to obtain the PE cast film. Wherein the stretching temperature is 90 ℃, the stretching ratio is 1.6, the stretching speed is 150mm/min, the dyne value of the film after corona treatment is 36, and the mesh number of the anilox roller is 120 meshes.
Example two
A high-strength PE cast film comprises the following raw materials in parts by weight: 15 parts of high-pressure low-density polyethylene, 40 parts of low-pressure high-density polyethylene, 65 parts of linear low-density polyethylene, 15 parts of metallocene polyethylene (Priman SP1520), 13 parts of white master batch, 0.5 part of polyether modified silicon defoamer, 0.1 part of ethylene bis-oleamide, 10101 part of antioxidant, 2 parts of acetyl tributyl citrate and 15 parts of styrene-butadiene-styrene block copolymer.
A preparation method of a high-strength PE casting film comprises the following steps:
(1) drying each raw material for 1.5h, controlling the drying temperature at 90 ℃, and then weighing each raw material according to the predetermined weight part for later use;
(2) uniformly stirring and mixing the weighed raw materials by a stirrer, then sending the raw materials into a double-screw extruder for melting and plasticizing, extruding the raw materials from a flat seam die orifice of a T-shaped die head, and cooling the raw materials by a cooling roller to form a film; wherein the T-die temperature is 205 deg.C, the temperatures of the zones in the twin-screw extruder are 180 deg.C, 190 deg.C, 205 deg.C, 195 deg.C, and the temperature of the cooling roll is 20 deg.C
(3) And (3) sequentially carrying out longitudinal stretching, corona and embossing treatment on the film obtained in the step (2), and finally cutting edges and rolling to obtain the PE cast film. Wherein the stretching temperature is 95 ℃, the stretching ratio is 1.8, the stretching speed is 180mm/min, the dyne value of the film after corona treatment is 37, and the mesh number of the anilox roll is 140 meshes.
EXAMPLE III
A high-strength PE cast film comprises the following raw materials in parts by weight: 25 parts of high-pressure low-density polyethylene, 60 parts of low-pressure high-density polyethylene, 85 parts of linear low-density polyethylene and 10 parts of metallocene polyethylene (Exxon Mobil exposed)TM1018HA), 18 parts of white master batch, 2 parts of polyether modified silicon defoamer, 0.8 part of erucamide, 6263 parts of antioxidant, 3 parts of acetyl tributyl citrate and 12 parts of styrene-butadiene-styrene block copolymer.
A preparation method of a high-strength PE casting film comprises the following steps:
(1) drying each raw material for 2 hours at the drying temperature of 95 ℃, and then weighing each raw material according to the preset weight part for later use;
(2) uniformly stirring and mixing the weighed raw materials by a stirrer, then sending the raw materials into a double-screw extruder for melting and plasticizing, extruding the raw materials from a flat seam die orifice of a T-shaped die head, and cooling the raw materials by a cooling roller to form a film; wherein the temperature of the T-shaped die head is 210 ℃, the temperature of each interval in the double-screw extruder is 185 ℃, 195 ℃, 210 ℃ and 200 ℃, and the temperature of the cooling roller is 25 ℃;
(3) and (3) sequentially carrying out longitudinal stretching, corona and embossing treatment on the film obtained in the step (2), and finally cutting edges and rolling to obtain the PE cast film. Wherein the stretching temperature is 100 ℃, the stretching ratio is 2.0, the stretching speed is 200mm/min, the dyne value of the film after corona treatment is 38, and the mesh number of the anilox roll is 170 meshes.
Performance testing
The high strength PE cast films prepared in the first to third examples were tested for tensile strength and elongation at break, and the 90 ° peel strength and the holding power of the tape type left and right tape to the PE cast film surface, and the test results are shown in table 1, and the PE cast film used in the prior diaper was used as a control group. Wherein the tensile strength and elongation at break are tested according to GB/T13022-.
TABLE 1
As can be seen from Table 1, the 90-degree peel strength of the PE casting film prepared by the invention is controlled within the range of 2.5-4.5N/25 mm after the PE casting film is bonded with the adhesive left and right stickers, and the PE casting film and the adhesive left and right stickers are easily separated; the permanent adhesive force is more than 3.5N/mm, and the continuous adhesive time is long. Meanwhile, the prepared PE casting film has good tensile strength and elongation at break, and the PE casting film cannot be torn when the left and right stickers are torn.
The above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.
Claims (9)
1. A high strength PE cast film characterized in that: the feed comprises the following raw materials in parts by weight: 15-25 parts of high-pressure low-density polyethylene, 40-60 parts of low-pressure high-density polyethylene, 65-85 parts of linear low-density polyethylene, 10-15 parts of metallocene polyethylene, 9-18 parts of white master batch, 0.5-2 parts of defoaming agent, 0.1-0.8 part of slipping agent, 1-3 parts of antioxidant, 2-4 parts of acetyl tributyl citrate and 8-15 parts of styrene-butadiene-styrene block copolymer.
2. A high strength cast PE film according to claim 1, wherein: the feed comprises the following raw materials in parts by weight: 20 parts of high-pressure low-density polyethylene, 50 parts of low-pressure high-density polyethylene, 75 parts of linear low-density polyethylene, 12.5 parts of metallocene polyethylene, 9 parts of white master batch, 1 part of defoaming agent, 0.4 part of slipping agent, 2 parts of antioxidant, 4 parts of acetyl tributyl citrate and 8 parts of styrene-butadiene-styrene block copolymer.
3. A high strength cast PE film according to claim 1, wherein: the metallocene polyethylene is Exxon Mobil exposedTM1018HA or pragman SP 1520.
4. A high strength cast PE film according to claim 1, wherein: the slipping agent is any one of oleamide, ethylene bisoleamide and erucamide, and the defoaming agent is a polyether modified silicon defoaming agent.
5. A method of producing a high strength cast PE film according to claim 1, characterized in that: the method comprises the following steps:
(1) weighing the raw materials according to the predetermined weight part for later use;
(2) uniformly stirring and mixing the weighed raw materials by a stirrer, then sending the raw materials into a double-screw extruder for melting and plasticizing, extruding the raw materials from a flat seam die orifice of a T-shaped die head, and cooling the raw materials by a cooling roller to form a film;
(3) and (3) stretching, corona and embossing the film obtained in the step (2), and finally trimming and rolling to obtain the PE cast film.
6. The production method of a high-strength PE cast film according to claim 5, characterized in that: drying the raw materials in the step (1) before weighing, wherein the drying temperature is controlled to be 85-95 ℃.
7. The production method of a high-strength PE cast film according to claim 5, characterized in that: the temperature of the T-shaped die in the step (2) is 200-210 ℃.
8. The production method of a high-strength PE cast film according to claim 5, characterized in that: and (4) in the step (3), the dyne value of the film after corona treatment is 36-38.
9. The production method of a high-strength PE cast film according to claim 5, characterized in that: and (3) embossing treatment is carried out by enabling the film to pass through a gap between the anilox roller and the silica gel roller.
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