CN108314820A - Stretched film and preparation method thereof - Google Patents
Stretched film and preparation method thereof Download PDFInfo
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- CN108314820A CN108314820A CN201810130490.5A CN201810130490A CN108314820A CN 108314820 A CN108314820 A CN 108314820A CN 201810130490 A CN201810130490 A CN 201810130490A CN 108314820 A CN108314820 A CN 108314820A
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- 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
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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
- 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
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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
- 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
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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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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
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Abstract
The invention discloses a kind of stretched films and preparation method thereof, belong to field of packaging material, its key points of the technical solution are that a kind of stretched film, by the material composition of following parts by weight：15 25 parts of low density polyethylene (LDPE), 58 parts of polypropylene, 49 parts of very low density polyethylene, 25 parts of high density polyethylene (HDPE), 1.1 1.5 parts of toluene di-isocyanate(TDI), 0.2 0.5 parts of polybutadiene, 5 7.5 parts of metallocene, 1.2 1.7 parts of halogen-free flame retardants, 0.3 0.8 parts of plasticizer, modified 0.6 1.1 parts of polyisobutene, the melting means of the low density polyethylene (LDPE) is 3.5g/10min, density 0.926g/cm3, the melting means of the very low density polyethylene is 2g/10min, density 0.891g/cm3, the melting means of high density polyethylene (HDPE) is 6.3g/10min, density 0.953g/cm3；The preparation method of the stretched film includes the following steps：(1) mold is cleared up；(2) it feeds；(3) it squeezes out；(4) it is cast：(5) it winds.Stretched film prepared by the present invention has higher tensile strength and tearing toughness.
Description
Technical field
The present invention relates to field of packaging material, more specifically, it is related to a kind of stretched film and preparation method thereof.
Background technology
The packaged form of product is varied, and it is also one of them more commonly used packaged form to stretch membrane material.It can
Protection is formed with the periphery in product, can make that product is moisture-proof, dust-proof, waterproof.Membrane material is stretched to pack compared to traditional papery
Its cost is more cheap, has very high application value.Stretched film commonly used material is low density polyethylene (LDPE), through overcurrent
Prolong or stretched film that film-blowing process is prepared.Stretched film packing method is simple, especially suitable in logistic industry, stretching at present
The speedup in film market is very fast, and annual growth rate has boundless market 20% or more.
But conventional stretching membrane material stretches the tensile strength and tear-proof of membrane material due to the unicity of its ingredient
Intensity is relatively low, is easily broken when encountering sharppointed article, cannot preferably be applied in packaging product, it is therefore desirable to prepare a kind of
Stretched film with good stretch-proof and tear resistance.
Invention content
In view of the deficiencies of the prior art, the present invention intends to provide a kind of stretched film, with good anti-
Stretching and tear resistance.
To achieve the above object, the present invention provides following technical solutions：A kind of stretched film, by the substance of following parts by weight
Composition：15-25 parts of low density polyethylene (LDPE), 5-8 parts of polypropylene, 4-9 parts of very low density polyethylene, 2-5 parts of high density polyethylene (HDPE), first
1.1-1.5 parts of phenylene diisocyanate, 5-7.5 parts of metallocene, 1.2-1.7 parts of halogen-free flame retardants, increases 0.2-0.5 parts of polybutadiene
0.3-0.8 parts of agent, modified 0.6-1.1 parts of polyisobutene are moulded, the melting means of the low density polyethylene (LDPE) is 3.5g/10min, and density is
0.926g/cm3, the melting means of the very low density polyethylene is 2g/10min, density 0.891g/cm3, high density polyethylene (HDPE)
Melting means is 6.3g/10min, density 0.953g/cm3。
By using above-mentioned technical proposal, it is blended using very low density polyethylene and polypropylene, high density polyethylene (HDPE), it can
The tearing strength for improving stretched film improves its toughness, environmental stress crack resistance and flexibility, and toluene di-isocyanate(TDI) is added,
The shock resistance degree, penetration-resistant, anti-weight that stretched film can be improved pound falling property and flexibility, modified polyisobutene are added, as increasing
Viscous master batch, can make stretched film have preferable extensibility and good resilience, and it is good that stretched film can be made to have
Mechanical strength.
The present invention is further arranged to：The modified polyisobutene is prepared by following methods：It is 3 to weigh mass ratio：
1：1：2:1 isobutene, bis- (2- chloro isopropyls) benzene of Isosorbide-5-Nitrae-, vanadium tetrachloride, 2- picolines and triphenyl allyl silicane, will
Bis- (2- chloro isopropyls) benzene of isobutene, Isosorbide-5-Nitrae-, vanadium tetrachloride and 2- picolines be placed in blender stirring bring it about it is poly-
Reaction is closed, modified polyisobutene is made triphenyl allyl silicane is added into blender.
By using above-mentioned technical proposal, bis- (2- chloro isopropyls) benzene of isobutene, Isosorbide-5-Nitrae-, vanadium tetrachloride and 2- methyl are utilized
Pyridine polymerization generates polyisobutene, is modified polyisobutene end-allyl group is made using triphenyl allyl silicane, can improve
The activity of polyisobutene, convenient for polyisobutene and other substance reactions.
The present invention is further arranged to：By the material composition of following parts by weight：20 parts of low density polyethylene (LDPE), polypropylene 6.5
Part, 6.5 parts of very low density polyethylene, 3.5 parts of high density polyethylene (HDPE), 1.3 parts of toluene di-isocyanate(TDI), 0.35 part of polybutadiene,
6 parts of metallocene, 1.55 parts of halogen-free flame retardants, 0.55 part of plasticizer, modified 0.85 part of polyisobutene, the low density polyethylene (LDPE)
Melting means is 3.5g/10min, density 0.926g/cm3, the melting means of the very low density polyethylene is 2g/10min, and density is
0.891g/cm3, the melting means of high density polyethylene (HDPE) is 6.3g/10min, density 0.953g/cm3。
By using above-mentioned technical proposal, using the proportioning of the parts by weight, stretched film obtained has preferable stretch-proof
Performance and tear resistance.
The present invention is further arranged to：Plasticizer refers to dioctyl phthalate, repefral, adjacent benzene two
One or more of formic acid dicyclohexyl maleate.
It can enhance the flexibility of stretched film using plasticizer by using above-mentioned technical proposal, stretched film is made to encounter
When sharp object, there is preferable degree of drawing, be not easy to be pierced through by sharp object.
The present invention is further arranged to：The halogen-free flame retardants is by melamine, ammonium polyphosphate, pentaerythrite and organic
Montmorillonite is 3 in mass ratio:1:1:2 compositions.
By using above-mentioned technical proposal, melamine releases CO when heated2、NH3、N2Gas and H2O reduces sky
The concentration of the fuel gas generated when oxygen and high polymer are thermally decomposed in gas, and the non-flammable gases generated, have taken away a part
Heat reduces the temperature of polymer surfaces, the N of generation2Free radical can be captured, the chain reaction of high polymer is inhibited, to hinder
It only burns, but melamine is used alone that effect is not so good and polyphosphoric acid amine, pentaerythrite and organo montmorillonite is compound makes
With effect is more preferable.
In view of the deficienciess of the prior art, it is another object of the present invention to provide a kind of preparation sides of stretched film
Method, the stretched film prepared have good stretch-proof and tear resistance, include the following steps：
(1) mold is cleared up：Go deep into die orifice 2-3cm with soft cutter and remove material residue 3 times, replaces strainer, reaction temperature is set in 80
DEG C, 2-5 parts of 5-8 parts of polypropylene, 4-9 parts of very low density polyethylene and high density polyethylene (HDPE) are weighed according to weight ratio, is sufficiently stirred
Uniformly and keep the temperature 20 minutes at 80 DEG C；
(2) it feeds：Reaction temperature is risen to 95 DEG C, sequentially added into the raw material stirred evenly 15-25 parts of low density polyethylene (LDPE),
1.1-1.5 parts of toluene di-isocyanate(TDI), 0.2-0.5 parts of polybutadiene, 5-7.5 parts of metallocene, 1.2-1.7 parts of halogen-free flame retardants,
0.3-0.8 parts of plasticizer, modified 0.6-1.1 parts of polyisobutene, are sufficiently stirred, and keep the temperature 2 hours at 95 DEG C；
(3) it squeezes out：Raw material in step (2) is subjected to Couble screw rod high-temp extruding；
(4) it is cast：Casting temperature by raw material after extrusion casting machine casting film-forming, the firstth area to the 9th area is 220 DEG C, stream
It delays to obtain stretched film；
(5) it winds：Stretched film is subjected to volume packet with winder, is stretched film finished product after volume packet.
By using above-mentioned technical proposal, mold is first cleared up, can prevent drop point caused by material lagging from scratching and stretch
Film surface influences product quality；First low density polyethylene (LDPE), polypropylene, very low density polyethylene and high density polyethylene (HDPE) are stirred
Uniformly, other dispensings are added, are again stirring for uniformly, stirring using gradation, can be convenient for stirring evenly raw material；Utilize strainer
Impurity in raw material can be removed, ensure that the stretched film prepared has higher transparency and flatness, without black material residue；It will
Casting temperature is set as 220 DEG C, can ensure that stretched film uniformly flows out, and consistency of thickness, prepares the higher stretched film of mass.
The present invention is further arranged to：The mesh number of strainer is 100 mesh in the step (1), and is arranged two layers.
By using above-mentioned technical proposal, the impurity that the strainer for being 100 using mesh number can be in filter stock makes to have prepared
At stretched film there is preferable transparency and flatness, quality is higher.
The present invention is further arranged to：The screw diameter of double screw extruder is 55mm in the step (3), and draw ratio is
15:1。
By using above-mentioned technical proposal, screw diameter 55mm, draw ratio 15:1, the length of screw rod is then 8.25m,
Longer spiro rod plasticizing effect is good.
The present invention is further arranged to：Step (3) the high temperature extruding is divided into 4 stages, first stage temperature range
It it is 154-166 DEG C, second stage temperature range is 174-181 DEG C, and phase III temperature range is 186-198 DEG C, fourth stage
Temperature range is 200-210 DEG C.
It by using above-mentioned technical proposal, is squeezed stage by stage during high temperature extrusion, because of the surface of particle
Product is little, although viscous dissipation heat is very big, receives the restriction of heat transfer area, the practical energy for coming in and going out solid particle is limited
, so that temperature is increased at staged, particle surface and particle inner homogeneous can be made heated, the material quality of extrusion can be made more
It is good.
The present invention is further arranged to：Stir speed (S.S.) is 900-1200 revs/min in the step (1) and step (2),
Mixing time is 30-50min.
Can be uniform by material stirring using 900-1200 revs/min of rotating speed by using above-mentioned technical proposal, and
Mixing time is long, it is ensured that is mixed between each component abundant.
In conclusion the invention has the advantages that：
(1) present invention is blended by using very low density polyethylene and polypropylene, high density polyethylene (HDPE) and is used as raw material, can improve
The tearing strength of stretched film improves its toughness, environmental stress crack resistance and flexibility；
(2) present invention can improve the shock resistance degree, penetration-resistant, anti-weight of stretched film by the way that toluene di-isocyanate(TDI) is added
Pound falling property and flexibility；
(3) present invention is by the modified polyisobutene of addition, as thickening master batch, can make stretched film have preferable extensibility and
Good resilience, and can make stretched film that there is good mechanical strength；
(4) present invention makes temperature rise at staged using being squeezed stage by stage during high temperature extrusion, can make
Grain surface and particle inner homogeneous are heated, and the material quality of extrusion can be made more preferable.
Specific implementation mode
With reference to embodiment, invention is further described in detail.
Embodiment 1：A kind of stretched film, by the material composition of following parts by weight：15 parts of low density polyethylene (LDPE), 5 parts of polypropylene,
4 parts of very low density polyethylene, 2 parts of high density polyethylene (HDPE), 1.1 parts of toluene di-isocyanate(TDI), 0.2 part of polybutadiene, metallocene 5
Part is 3 in mass ratio by melamine, ammonium polyphosphate, pentaerythrite and organo montmorillonite:1:1:The halogen-free flame retardants of 2 compositions
1.2 parts, 0.3 part of dioctyl phthalate, modified 0.6 part of polyisobutene, the wherein melting means of low density polyethylene (LDPE) is 3.5g/
10min, density 0.926g/cm3, very low density polyethylene melting means be 2g/10min, density 0.891g/cm3, high density
The melting means of polyethylene is 6.3g/10min, density 0.953g/cm3；Modified polyisobutene is prepared by following methods：It weighs
Mass ratio is 3：1：1：2:1 isobutene, bis- (2- chloro isopropyls) benzene of Isosorbide-5-Nitrae-, vanadium tetrachloride, 2- picolines and triphenyl alkene
Bis- (2- chloro isopropyls) benzene of isobutene, Isosorbide-5-Nitrae-, vanadium tetrachloride and 2- picolines are placed in blender and are stirred by propyl silane
Polymerisation is brought it about, modified polyisobutene is made triphenyl allyl silicane is added into blender；The stretched film
Preparation method includes the following steps：
(1) mold is cleared up：Go deep into die orifice 2-3cm with soft cutter and remove material residue 3 times, replacement mesh number is 100 purpose, two layers of strainer, will
Reaction temperature is set in 80 DEG C, and 5 parts of polypropylene, 4 parts of very low density polyethylene and high density polyethylene (HDPE) 2 are weighed according to weight ratio
Part, it stirs and keeps the temperature 20 minutes at 80 DEG C；
(2) it feeds：Reaction temperature is risen to 95 DEG C, 15 parts of low density polyethylene (LDPE), first are sequentially added into the raw material stirred evenly
1.1 parts of phenylene diisocyanate, 0.2 part of polybutadiene, 5 parts of metallocene, by melamine, ammonium polyphosphate, pentaerythrite and organic
Montmorillonite is 3 in mass ratio:1:1:1.2 parts of halogen-free flame retardants, 0.3 part of dioctyl phthalate, the modified poly- isobutyl of 2 compositions
0.6 part of alkene, is sufficiently stirred, and stir speed (S.S.) is 900 revs/min, and mixing time is 50min, and keeps the temperature 2 at 95 DEG C
Hour；
(3) it squeezes out：By the raw material in step (2) a diameter of 50mm, draw ratio 15:1 twin-screw carries out high temperature extrusion, high
Warm Extrusion is divided into 4 stages, and first stage temperature range is 154 DEG C, and second stage temperature range is 174 DEG C, phase III temperature
It is 186 DEG C to spend section, and fourth stage temperature range is 200 DEG C；
(4) it is cast：Casting temperature by raw material after extrusion casting machine casting film-forming, the firstth area to the 9th area is 220 DEG C, stream
It delays to obtain stretched film；
(5) it winds：Stretched film is subjected to volume packet with winder, is stretched film finished product after volume packet.
Embodiment 2：A kind of stretched film, by the material composition of following parts by weight：20 parts of low density polyethylene (LDPE), polypropylene 6.5
Part, 6.5 parts of very low density polyethylene, 3.5 parts of high density polyethylene (HDPE), 1.3 parts of toluene di-isocyanate(TDI), 0.35 part of polybutadiene,
6 parts of metallocene is 3 in mass ratio by melamine, ammonium polyphosphate, pentaerythrite and organo montmorillonite:1:1:The Halogen of 2 compositions
1.55 parts of fire retardant, 0.55 part of repefral, modified 0.85 part of polyisobutene, the wherein melting means of low density polyethylene (LDPE)
For 3.5g/10min, density 0.926g/cm3, very low density polyethylene melting means be 2g/10min, density 0.891g/cm3、
The melting means of high density polyethylene (HDPE) is 6.3g/10min, density 0.953g/cm3；Modified polyisobutene prepared by following methods and
At：It is 3 to weigh mass ratio：1：1：2:1 isobutene, bis- (2- chloro isopropyls) benzene of Isosorbide-5-Nitrae-, vanadium tetrachloride, 2- picolines and three
Bis- (2- chloro isopropyls) benzene of isobutene, Isosorbide-5-Nitrae-, vanadium tetrachloride and 2- picolines are placed on blender by allyl base silane
Middle stirring brings it about polymerisation, and modified polyisobutene is made triphenyl allyl silicane is added into blender；The drawing
The preparation method for stretching film includes the following steps：
(1) mold is cleared up：Go deep into die orifice 2-3cm with soft cutter and remove material residue 3 times, replacement mesh number is 100 purpose, two layers of strainer, will
Reaction temperature is set in 80 DEG C, and 6.5 parts of polypropylene, 6.5 parts of very low density polyethylene and high-density polyethylene are weighed according to weight ratio
3.5 parts of alkene, stirs, and stir speed (S.S.) is 1050 revs/min, and mixing time is 40min, and is kept the temperature at 80 DEG C
20 minutes；
(2) it feeds：Reaction temperature is risen to 95 DEG C, 20 parts of low density polyethylene (LDPE), first are sequentially added into the raw material stirred evenly
1.3 parts of phenylene diisocyanate, 0.35 part of polybutadiene, 6 parts of metallocene, by melamine, ammonium polyphosphate, pentaerythrite and organic
Montmorillonite is 3 in mass ratio:1:1:1.55 parts of the halogen-free flame retardants of 2 compositions, 0.55 part of repefral, modification are poly- different
0.85 part of butylene, is sufficiently stirred, and stir speed (S.S.) is 1050 revs/min, and mixing time is 40min, and at 95 DEG C
Heat preservation 2 hours；
(3) it squeezes out：By the raw material in step (2) a diameter of 50mm, draw ratio 15:1 twin-screw carries out high temperature extrusion, high
Warm Extrusion is divided into 4 stages, and first stage temperature range is 154-166 DEG C, and second stage temperature range is 174-181 DEG C, the
Three phase temperature sections are 186-198 DEG C, and fourth stage temperature range is 200-210 DEG C；
(4) it is cast：Casting temperature by raw material after extrusion casting machine casting film-forming, the firstth area to the 9th area is 220 DEG C, stream
It delays to obtain stretched film；
(5) it winds：Stretched film is subjected to volume packet with winder, is stretched film finished product after volume packet.
Embodiment 3：A kind of stretched film, by the material composition of following parts by weight：25 parts of low density polyethylene (LDPE), 8 parts of polypropylene,
9 parts of very low density polyethylene, 5 parts of high density polyethylene (HDPE), 1.5 parts of toluene di-isocyanate(TDI), 0.5 part of polybutadiene, metallocene 7.5
Part is 3 in mass ratio by melamine, ammonium polyphosphate, pentaerythrite and organo montmorillonite:1:1:The halogen-free flame retardants of 2 compositions
1.7 parts, 0.8 part of dicyclohexyl phthalate, modified 1.1 parts of polyisobutene, the wherein melting means of low density polyethylene (LDPE) is 3.5g/
10min, density 0.926g/cm3, very low density polyethylene melting means be 2g/10min, density 0.891g/cm3, high density
The melting means of polyethylene is 6.3g/10min, density 0.953g/cm3；Modified polyisobutene is prepared by following methods：It weighs
Mass ratio is 3：1：1：2:1 isobutene, bis- (2- chloro isopropyls) benzene of Isosorbide-5-Nitrae-, vanadium tetrachloride, 2- picolines and triphenyl alkene
Bis- (2- chloro isopropyls) benzene of isobutene, Isosorbide-5-Nitrae-, vanadium tetrachloride and 2- picolines are placed in blender and are stirred by propyl silane
Polymerisation is brought it about, modified polyisobutene is made triphenyl allyl silicane is added into blender；The stretched film
Preparation method includes the following steps：
(1) mold is cleared up：Go deep into die orifice 2-3cm with soft cutter and remove material residue 3 times, replacement mesh number is 100 purpose, two layers of strainer, will
Reaction temperature is set in 80 DEG C, and 8 parts of polypropylene, 9 parts of very low density polyethylene and high density polyethylene (HDPE) 5 are weighed according to weight ratio
Part, it stirs, stir speed (S.S.) is 1200 revs/min, and mixing time is 30min, and 20 points are kept the temperature at 80 DEG C
Clock；
(2) it feeds：Reaction temperature is risen to 95 DEG C, 25 parts of low density polyethylene (LDPE), first are sequentially added into the raw material stirred evenly
1.5 parts of phenylene diisocyanate, 7.5 parts of metallocene, by melamine, ammonium polyphosphate, pentaerythrite and has 0.5 part of polybutadiene
Machine montmorillonite is 3 in mass ratio:1:1:1.7 parts of the halogen-free flame retardants of 2 compositions, is modified and gathers 0.8 part of dicyclohexyl phthalate
1.1 parts of isobutene, is sufficiently stirred, and stir speed (S.S.) is 1200 revs/min, and mixing time is 30min, and at 95 DEG C
Heat preservation 2 hours；
(3) it squeezes out：By the raw material in step (2) a diameter of 50mm, draw ratio 15:1 twin-screw carries out high temperature extrusion, high
Warm Extrusion is divided into 4 stages, and first stage temperature range is 154-166 DEG C, and second stage temperature range is 174-181 DEG C, the
Three phase temperature sections are 186-198 DEG C, and fourth stage temperature range is 200-210 DEG C；
(4) it is cast：Casting temperature by raw material after extrusion casting machine casting film-forming, the firstth area to the 9th area is 220 DEG C, stream
It delays to obtain stretched film；
(5) it winds：Stretched film is subjected to volume packet with winder, is stretched film finished product after volume packet.
Comparative example：A kind of stretched film, by the material composition of following parts by weight：20 parts of low density polyethylene (LDPE), toluene diisocyanate
1.3 parts of acid esters, 6 parts of metallocene, is pressed by melamine, ammonium polyphosphate, pentaerythrite and organo montmorillonite 0.35 part of polybutadiene
Mass ratio is 3:1:1:1.55 parts of halogen-free flame retardants, 0.55 part of repefral, the modified polyisobutene 0.85 of 2 compositions
Part, wherein the melting means of low density polyethylene (LDPE) is 3.5g/10min, density 0.926g/cm3, very low density polyethylene melting means be
2g/10min, density 0.891g/cm3, high density polyethylene (HDPE) melting means be 6.3g/10min, density 0.953g/cm3；It is modified
Polyisobutene is prepared by following methods：It is 3 to weigh mass ratio：1：1：2:1 isobutene, Isosorbide-5-Nitrae-are bis- (2- chloro isopropyls)
Benzene, vanadium tetrachloride, 2- picolines and triphenyl allyl silicane, by bis- (2- chloro isopropyls) benzene of isobutene, Isosorbide-5-Nitrae-, four chlorinations
Vanadium and 2- picolines are placed on stirring in blender and bring it about polymerisation, and triphenyl allyl is being added into blender
Modified polyisobutene is made in silane；The preparation method of the stretched film includes the following steps：
(1) mold is cleared up：Go deep into die orifice 2-3cm with soft cutter and remove material residue 3 times, replacement mesh number is 100 purpose, two layers of strainer；
(2) it feeds：Reaction temperature is risen to 95 DEG C, 20 parts of low density polyethylene (LDPE), first are sequentially added into the raw material stirred evenly
1.3 parts of phenylene diisocyanate, 0.35 part of polybutadiene, 6 parts of metallocene, by melamine, ammonium polyphosphate, pentaerythrite and organic
Montmorillonite is 3 in mass ratio:1:1:1.55 parts of the halogen-free flame retardants of 2 compositions, 0.55 part of repefral, modification are poly- different
0.85 part of butylene, is sufficiently stirred, and stir speed (S.S.) is 1050 revs/min, and mixing time is 40min, and at 95 DEG C
Heat preservation 2 hours；
(3) it squeezes out：By the raw material in step (2) a diameter of 50mm, draw ratio 15:1 twin-screw carries out high temperature extrusion, high
Warm Extrusion is divided into 4 stages, and first stage temperature range is 154-166 DEG C, and second stage temperature range is 174-181 DEG C, the
Three phase temperature sections are 186-198 DEG C, and fourth stage temperature range is 200-210 DEG C；
(4) it is cast：Casting temperature by raw material after extrusion casting machine casting film-forming, the firstth area to the 9th area is 220 DEG C, stream
It delays to obtain stretched film；
(5) it winds：Stretched film is subjected to volume packet with winder, is stretched film finished product after volume packet.
Comparative example 2：A kind of stretched film, by the material composition of following parts by weight：20 parts of low density polyethylene (LDPE), polypropylene 6.5
Part, 6.5 parts of very low density polyethylene, 3.5 parts of high density polyethylene (HDPE), 1.3 parts of toluene di-isocyanate(TDI), 0.35 part of polybutadiene,
6 parts of metallocene is 3 in mass ratio by melamine, ammonium polyphosphate, pentaerythrite and organo montmorillonite:1:1:The Halogen of 2 compositions
1.55 parts of fire retardant, 0.55 part of repefral, the wherein melting means of low density polyethylene (LDPE) are 3.5g/10min, and density is
0.926g/cm3, very low density polyethylene melting means be 2g/10min, density 0.891g/cm3, high density polyethylene (HDPE) melting means
For 6.3g/10min, density 0.953g/cm3；The preparation method of the stretched film includes the following steps：
(1) mold is cleared up：Go deep into die orifice 2-3cm with soft cutter and remove material residue 3 times, replacement mesh number is 100 purpose, two layers of strainer, will
Reaction temperature is set in 80 DEG C, and 6.5 parts of polypropylene, 6.5 parts of very low density polyethylene and high-density polyethylene are weighed according to weight ratio
3.5 parts of alkene, stirs, and stir speed (S.S.) is 1050 revs/min, and mixing time is 40min, and is kept the temperature at 80 DEG C
20 minutes；
(2) it feeds：Reaction temperature is risen to 95 DEG C, 20 parts of low density polyethylene (LDPE), first are sequentially added into the raw material stirred evenly
1.3 parts of phenylene diisocyanate, 0.35 part of polybutadiene, 6 parts of metallocene, by melamine, ammonium polyphosphate, pentaerythrite and organic
Montmorillonite is 3 in mass ratio:1:1:1.55 parts of halogen-free flame retardants, 0.55 part of repefral, the polyisobutene of 2 compositions
It 0.85 part, is sufficiently stirred, stir speed (S.S.) is 1050 revs/min, and mixing time is 40min, and keeps the temperature 2 at 95 DEG C
Hour；
(3) it squeezes out：By the raw material in step (2) a diameter of 50mm, draw ratio 15:1 twin-screw carries out high temperature extrusion, high
Warm Extrusion is divided into 4 stages, and first stage temperature range is 154-166 DEG C, and second stage temperature range is 174-181 DEG C, the
Three phase temperature sections are 186-198 DEG C, and fourth stage temperature range is 200-210 DEG C；
(4) it is cast：Casting temperature by raw material after extrusion casting machine casting film-forming, the firstth area to the 9th area is 220 DEG C, stream
It delays to obtain stretched film；
(5) it winds：Stretched film is subjected to volume packet with winder, is stretched film finished product after volume packet.
Comparative example 3：Embodiment 2：A kind of stretched film, by the material composition of following parts by weight：20 parts of low density polyethylene (LDPE), first
1.3 parts of phenylene diisocyanate, 0.35 part of polybutadiene, 6 parts of metallocene, by melamine, ammonium polyphosphate, pentaerythrite and organic
Montmorillonite is 3 in mass ratio:1:1:1.55 parts of halogen-free flame retardants, 0.55 part of the repefral of 2 compositions, wherein low close
The melting means for spending polyethylene is 3.5g/10min, density 0.926g/cm3, very low density polyethylene melting means be 2g/10min, it is close
Degree is 0.891g/cm3, high density polyethylene (HDPE) melting means be 6.3g/10min, density 0.953g/cm3；The preparation of the stretched film
Method includes the following steps：
(1) mold is cleared up：Go deep into die orifice 2-3cm with soft cutter and remove material residue 3 times, replacement mesh number is 100 purpose, two layers of strainer；
(2) it feeds：Reaction temperature is risen to 95 DEG C, 20 parts of low density polyethylene (LDPE), first are sequentially added into the raw material stirred evenly
1.3 parts of phenylene diisocyanate, 0.35 part of polybutadiene, 6 parts of metallocene, by melamine, ammonium polyphosphate, pentaerythrite and organic
Montmorillonite is 3 in mass ratio:1:1:1.55 parts of halogen-free flame retardants, 0.55 part of the repefral of 2 compositions carry out abundant
Stirring, stir speed (S.S.) is 1050 revs/min, and mixing time is 40min, and keeps the temperature 2 hours at 95 DEG C；
(3) it squeezes out：By the raw material in step (2) a diameter of 50mm, draw ratio 15:1 twin-screw carries out high temperature extrusion, high
Warm Extrusion is divided into 4 stages, and first stage temperature range is 154-166 DEG C, and second stage temperature range is 174-181 DEG C, the
Three phase temperature sections are 186-198 DEG C, and fourth stage temperature range is 200-210 DEG C；
(4) it is cast：Casting temperature by raw material after extrusion casting machine casting film-forming, the firstth area to the 9th area is 220 DEG C, stream
It delays to obtain stretched film；
(5) it winds：Stretched film is subjected to volume packet with winder, is stretched film finished product after volume packet.
The tensile strength of stretched film and tearing toughness made from embodiment 1-3 and comparative example 1-3 are detected, detected
The results are shown in Table 1：
The testing result of stretched film made from table 1 embodiment 1-3 and comparative example 1-3
As shown in Table 1, various embodiments of the present invention are by being added polypropylene part, very low density polyethylene part and high density polyethylene (HDPE)
The tensile strength of stretched film and tearing toughness made from blend and the modified polyisobutene of addition are above in comparative example 1 and make
With the tensile strength and tearing toughness of the stretched film that conventional low density polyethylene (LDPE) is fabricated to, and modified poly- isobutyl is only added
The comparative example 1 of alkene and be only added polypropylene part, very low density polyethylene, high density polyethylene (HDPE) the comparative example 2 of blend be made
Stretched film, although tensile strength and tearing toughness all increase, that polypropylene is not added simultaneously in each embodiment
The effect that stretched film is made in part, the blend of very low density polyethylene part and high density polyethylene (HDPE) and modified polyisobutene is good.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of stretched film, it is characterised in that：By the material composition of following parts by weight：15-25 parts of low density polyethylene (LDPE), polypropylene
5-8 parts, 4-9 parts of very low density polyethylene, 2-5 parts of high density polyethylene (HDPE), 1.1-1.5 parts of toluene di-isocyanate(TDI), polybutadiene
0.2-0.5 parts, 5-7.5 parts of metallocene, 1.2-1.7 parts of halogen-free flame retardants, 0.3-0.8 parts of plasticizer, modified polyisobutene 0.6-
1.1 parts, the melting means of the low density polyethylene (LDPE) is 3.5g/10min, density 0.926g/cm3, the very low density polyethylene
Melting means be 2g/10min, density 0.891g/cm3, the melting means of high density polyethylene (HDPE) is 6.3g/10min, and density is
0.953g/cm3。
2. the stretched film according to claim 1, it is characterised in that：The modified polyisobutene is prepared by following methods
It forms：It is 3 to weigh mass ratio：1：1：2:1 isobutene, bis- (2- chloro isopropyls) benzene of Isosorbide-5-Nitrae-, vanadium tetrachloride, 2- picolines and
Bis- (2- chloro isopropyls) benzene of isobutene, Isosorbide-5-Nitrae-, vanadium tetrachloride and 2- picolines are placed on stirring by triphenyl allyl silicane
Stirring brings it about polymerisation in device, and modified polyisobutene is made triphenyl allyl silicane is added into blender.
3. stretched film according to claim 1, it is characterised in that：By the material composition of following parts by weight：Low density polyethylene
20 parts of alkene, 6.5 parts of polypropylene, 6.5 parts of very low density polyethylene, 3.5 parts of high density polyethylene (HDPE), 1.3 parts of toluene di-isocyanate(TDI),
0.35 part of polybutadiene, 6 parts of metallocene, 1.55 parts of halogen-free flame retardants, 0.55 part of plasticizer, modified 0.85 part of polyisobutene, institute
The melting means for stating low density polyethylene (LDPE) is 3.5g/10min, density 0.926g/cm3, the melting means of the very low density polyethylene is
2g/10min, density 0.891g/cm3, the melting means of high density polyethylene (HDPE) is 6.3g/10min, density 0.953g/cm3。
4. stretched film according to claim 1, it is characterised in that：Plasticizer refers to dioctyl phthalate, adjacent benzene two
One or more of formic acid dimethyl ester, dicyclohexyl phthalate.
5. stretched film according to claim 1, it is characterised in that：The halogen-free flame retardants is by melamine, polyphosphoric acid
Ammonium, pentaerythrite and organo montmorillonite are 3 in mass ratio:1:1:2 compositions.
6. the method for preparing the stretched film as described in claim 1-5 any one, it is characterised in that：Include the following steps：
(1) mold is cleared up：Go deep into die orifice 2-3cm with soft cutter and remove material residue 3 times, replaces strainer, reaction temperature is set in 80
DEG C, 2-5 parts of 5-8 parts of polypropylene, 4-9 parts of very low density polyethylene and high density polyethylene (HDPE) are weighed according to weight ratio, is sufficiently stirred
Uniformly and keep the temperature 20 minutes at 80 DEG C；
(2) it feeds：Reaction temperature is risen to 95 DEG C, sequentially added into the raw material stirred evenly 15-25 parts of low density polyethylene (LDPE),
1.1-1.5 parts of toluene di-isocyanate(TDI), 0.2-0.5 parts of polybutadiene, 5-7.5 parts of metallocene, 1.2-1.7 parts of halogen-free flame retardants,
0.3-0.8 parts of plasticizer, modified 0.6-1.1 parts of polyisobutene, are sufficiently stirred, and keep the temperature 2 hours at 95 DEG C；
(3) it squeezes out：Raw material in step (2) is subjected to Couble screw rod high-temp extruding；
(4) it is cast：Casting temperature by raw material after extrusion casting machine casting film-forming, the firstth area to the 9th area is 220 DEG C, stream
It delays to obtain stretched film；
(5) it winds：Stretched film is subjected to volume packet with winder, is stretched film finished product after volume packet.
7. the preparation method of stretched film according to claim 6, it is characterised in that：The mesh number of strainer in the step (1)
For 100 mesh, and it is arranged two layers.
8. the preparation method of stretched film according to claim 6, it is characterised in that：Twin-screw extrusion in the step (3)
The screw diameter of machine is 55mm, draw ratio 15:1.
9. the preparation method of stretched film according to claim 6, it is characterised in that：Step (3) high temperature, which squeezes, divides
For 4 stages, first stage temperature range is 154-166 DEG C, and second stage temperature range is 174-181 DEG C, phase III temperature
It is 186-198 DEG C to spend section, and fourth stage temperature range is 200-210 DEG C.
10. the preparation method of stretched film according to claim 6, it is characterised in that：In the step (1) and step (2)
Stir speed (S.S.) is 900-1200 revs/min, and mixing time is 30-50min.
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| CN108976772A (en) * | 2018-07-25 | 2018-12-11 | 苏州清之绿新材料有限公司 | A kind of wear-resisting antistatic composite sheet and preparation method thereof |
| CN110685032A (en) * | 2019-08-19 | 2020-01-14 | 浙江海洋大学 | Preparation method of polyethylene mesh wire monofilament with marine fouling prevention characteristic |
| CN111573000A (en) * | 2020-05-29 | 2020-08-25 | 佛山市驰力科技有限公司 | Wrapping film applied to PE mattress and preparation method |
| CN111592708A (en) * | 2020-06-16 | 2020-08-28 | 潍坊众合安美包装科技有限公司 | Metal nano stretching and winding film and preparation method thereof |
| CN112406238A (en) * | 2020-12-01 | 2021-02-26 | 昆山金盟塑料薄膜有限公司 | Green environment-friendly cold-stretched film and preparation method thereof |
| CN114085449A (en) * | 2021-11-11 | 2022-02-25 | 宁波市鄞州冰雨塑料制品有限公司 | High-tensile winding film and processing technology |
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| CN114316424A (en) * | 2021-11-22 | 2022-04-12 | 金发科技股份有限公司 | Transparent weather-resistant PP/PS composite material and preparation method thereof |
| CN114316424B (en) * | 2021-11-22 | 2023-08-25 | 金发科技股份有限公司 | Transparent weather-proof PP/PS composite material and preparation method thereof |
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