CN106432768A - Polypropylene composition used for BOPP film coating, and preparation method thereof - Google Patents
Polypropylene composition used for BOPP film coating, and preparation method thereof Download PDFInfo
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- CN106432768A CN106432768A CN201510486094.2A CN201510486094A CN106432768A CN 106432768 A CN106432768 A CN 106432768A CN 201510486094 A CN201510486094 A CN 201510486094A CN 106432768 A CN106432768 A CN 106432768A
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Abstract
The invention discloses a polypropylene composition used for BOPP film coating. The composition comprises, by weight, 85-95 parts of a polypropylene random copolymer and 5-15 parts of low density polyethylene, the melt index of the polypropylene random copolymer is 20-38g/10min, and the content of ethylene in the polypropylene random copolymer is 3.8-4.5% (wt %). The invention also provides a preparation method of the polypropylene composition used for BOPP film coating. The preparation method comprises the following steps: uniformly mixing the polypropylene random copolymer and the low density polyethylene in a high speed mixer, and carrying out melt blending extrusion on the obtained mixture in a double screw extruder, and granulating the extruded mixture to prepare the polypropylene composition used for BOPP film coating. The above polypropylene coating with low heat sealing temperature, high bonding strength, good low-temperature performances and good flexibility is prepared by using the polypropylene random copolymer and the LDPE as base raw materials through a blending modification technology, and is suitable for the field of coating of BOPP films.
Description
Technical field
The invention belongs to polymeric material field is and in particular to a kind of polypropene composition for BOPP film coating and preparation
Method.
Background technology
With the development of domestic packing business, the range and consumption of coating class polyolefin resin is progressively expanded, makes coating level
The market demand of vistanex increasingly increases, and expensive, and has the trend continuing to raise up.Coating grade polypropylene (PP)
Resin has good mobility, film property, adhesion, and processing characteristics is stable, glutinous as seam in the coating of braided packing industry
Close material deeply to be liked by user.
Polypropylene coating material generally requires and has the characteristics that：1) good flowing properties, melt index MFR value is general to be required
16-36g/10min, guarantee film forming coats；2) narrow molecular weight distribution, typically requires 5 about；3) melt strength is high.
Patent CN102268207A《A kind of polypropylene coating material and preparation method thereof》Disclose a kind of polypropylene coating material, will
HOPP passes through the method adding polypropylene chemical degradation agent, adds a small amount of Low Density Polyethylene (LDPE) and line simultaneously
Type Low Density Polyethylene (LLDPE) is preparing polypropylene coating material.Patent CN101161736A《A kind of polypropylene weight
Carry container bag special coating resin combination and preparation method thereof》Disclose a kind of special coated with resins of polypropylene heavy-load packaging bag
Compositionss, including：Polypropylene homopolymer 84.5～94.1%, Low Density Polyethylene 4.7～8.4%, Petropols 1～
2.5%, inorganic filler 0～4.2%, antioxidant 0.05～0.25%, degradation agent 0.1～0.17%, in parts by weight.This invention
Coating resin combination processing rheological property excellent, melt flow rate stable between 25～32g/10min, film is uniform；
Polyacrylic adhesive property is good with matrix material, and warp-wise and broadwise peel strength are kept at more than 3.5N, and film forming orientation
Weak, warp-wise and broadwise peel strength difference little.But above-mentioned 2 patents all add polypropylene with HOPP for matrix resin
Polypropylene coating material is prepared in chemical degradation agent, and it can cause MFR ripple because the dispersion of polypropylene chemical degradation agent is uneven
Dynamic, thus affecting the stability of coating processes, and HOPP degree of crystallinity is larger, and the transparency of product can be led to poor.Specially
Sharp CN1312342A《Block copolymerized polypropylene paint》Disclose a kind of block copolymerized polypropylene paint, mainly with propylene
It is raw material with ethylene, the feature of this coating material is that ethylene contents are high, toughness, low temperature performance well, long service life, processing
Process is simple, coating process is stable, and processing temperature is low, energy-conservation, but strong as the bonding of coating material using block copolymerization polypropylene
Degree is not high, and the product transparency is poor.For improving these shortcomings, adopting fibre-grade homopolymerization PP and coating level domestic manufacturer more
The method of LDPE blending.But the fluctuation of this method MFR is big, and coating processes are unstable, and bond strength is low, and the product transparency is poor.
Coat field in polypropylene film (BOPP), to the side such as the transparency of polypropylene coating material, contractility and heat-sealing temperature
There is higher requirement in face, needs that the polypropylene coating material transparency is good, contraction is little, heat-sealing temperature is low, bond strength is high, existing
Some polypropylene coating materials can not meet the demand that polypropylene film (BOPP) coats field.
Content of the invention
Goal of the invention：The invention aims in solution prior art, polypropylene coating material flexibility is poor, MFR fluctuation is big,
Coating processes are unstable, and bond strength is low, the problems such as product transparency difference, provide that a kind of transparency is good, shrink little, heat-sealing
Temperature is low, bond strength the is high polypropene composition for BOPP film coating and preparation method.
Technical scheme：A kind of polypropene composition for BOPP film coating of the present invention, in parts by weight, by such as
The following group is grouped into：Polypropylene random copolymer 85-95 part, Low Density Polyethylene 5-15 part, described polypropylene random copolymer
Melt index be 20-38g/10min, in described polypropylene random copolymer ethylene contents be 3.8-4.5wt%.
Further, the described Low Density Polyethylene trade mark is coating level, and melt index is 6-16g/10min.
The present invention also provides a kind of polypropene composition for BOPP film coating, in parts by weight, is grouped into by following group：
Ene-propylene-butene random copolymer 85-95 part, Low Density Polyethylene 5-15 part, the melting of described polypropylene random copolymer
Index is 20-38g/10min, and in described ene-propylene-butene random copolymer, ethylene contents are 3.8-4.5wt%.Described low close
The degree polyethylene trade mark is coating level, and melt index is 6-16g/10min.
The present invention also provides a kind of preparation method of the polypropene composition for BOPP film coating, by polypropylene random copolymerization
Thing and Low Density Polyethylene in high-speed mixer and mixing uniformly, then carry out melt blending extrusion, finally in double screw extruder
Carry out pelletize and polypropene composition for BOPP film coating is obtained.
Further, the temperature of described granulation process is 150-170-190-200-210-210-210-190-180 DEG C, Screw Extrusion
Machine pelletize design temperature typically will exceed 30-50 DEG C of resin raw material melting peak temperature, and acrylic resin used in the present invention melts
Peak temperature is typically between 145-165 DEG C.
It is characterized in that, want evacuation during melt blending in double screw extruder.
Beneficial effect：The present invention adopts blend modification technology, raw material based on polypropylene random copolymer and LDPE, system
Standby heat-sealing temperature is low, bond strength is high, have good low temperature properties and flexible polypropylene coating material, and it is applied to BOPP
Film laminated etc. coats field.
Specific embodiment
In order to deepen the understanding of the present invention, below in conjunction with embodiment, the invention will be further described, and these embodiments are only
For explaining the present invention, do not constitute limiting the scope of the present invention.
According to GB/T3682-2000 standard testing, test condition is 230 DEG C, 2.160Kg to melt index of the present invention.Institute
State ash according to GB/T 9345.1-2008 standard testing, test temperature is 850 ± 50 DEG C.Described tensile property is according to GB/T
1040.2-2006 standard testing, draw speed 50mm/min.Described bending moduluses are according to GB/T 9341-2008 standard testing.
Described simple beam impact strength is according to GB/T 1043.1-2008 standard testing.Described melt temperature passes through differential scanning calorimeter
Tested.
Embodiment 1
By ethylene-propylene random copolymer (melt index is 35g/10min, ethylene contents are 3.8wt%) 88wt%, LDPE
(trade mark 1C7A) 12wt% in high-speed mixer and mixing uniformly, then carries out melt blending extrusion in double screw extruder, takes out
Vacuum, prilling temperature is 150-170-190-200-210-210-210-190-180 DEG C, and pelletize obtains coating grade polypropylene.
The coating grade polypropylene melt index of gained is 31.3g/10min, ash 189ppm, tensile yield strength 19.9MPa,
Bending moduluses 652MPa, room temperature simple beam impact strength 5.36kJ/m2, the first 104.2 DEG C of melting peak temperature, the second melting peak
143.6 DEG C of temperature.
Embodiment 2
By ethylene-propylene random copolymer (melt index is 35g/10min, ethylene contents are 3.8wt%) 90wt%, LDPE
(trade mark 1C7A) 10wt% in high-speed mixer and mixing uniformly, then carries out melt blending extrusion in double screw extruder, takes out
Vacuum, prilling temperature is 150-170-190-200-210-210-210-190-180 DEG C, and pelletize obtains coating grade polypropylene.
The coating grade polypropylene melt index of gained is 32.0g/10min, ash 176ppm, tensile yield strength 21.2MPa,
Bending moduluses 679MPa, room temperature simple beam impact strength 5.03kJ/m2, the first 104.6 DEG C of melting peak temperature, the second melting peak
143.2 DEG C of temperature.
Embodiment 3
By ethylene-propylene random copolymer (melt index is 35g/10min, ethylene contents are 3.8wt%) 92wt%, LDPE
(trade mark 1C7A) 8wt% in high-speed mixer and mixing uniformly, then carries out melt blending extrusion in double screw extruder, takes out
Vacuum, prilling temperature is 150-170-190-200-210-210-210-190-180 DEG C, and pelletize obtains coating grade polypropylene.
The coating grade polypropylene melt index of gained is 32.8g/10min, ash 172ppm, tensile yield strength 22.5MPa,
Bending moduluses 682MPa, room temperature simple beam impact strength 4.62kJ/m2, the first 104.0 DEG C of melting peak temperature, the second melting peak
143.3 DEG C of temperature.
Embodiment 4
By ene-propylene-butene random copolymer (melt index is 30g/10min) 90wt%, LDPE (trade mark 1C7A)
10wt% in high-speed mixer and mixing uniformly, then carries out melt blending extrusion, evacuation, pelletize temperature in double screw extruder
Spend for 150-170-190-200-210-210-210-190-180 DEG C, pelletize obtains coating grade polypropylene.
The coating grade polypropylene melt index of gained is 28.0g/10min, ash 159ppm, tensile yield strength 22.8MPa,
Bending moduluses 568MPa, room temperature simple beam impact strength 5.62kJ/m2, the first 103.8 DEG C of melting peak temperature, the second melting peak
138.6 DEG C of temperature.
Embodiment 5
By ethylene-propylene random copolymer (melt index is 35g/10min, ethylene contents are 3.8wt%) 90wt%, LDPE
(trade mark 1C7A) 10% (wt%) in high-speed mixer and mixing uniformly, then carries out melt blending in double screw extruder and squeezes
Go out, not evacuation, prilling temperature is 150-170-190-200-210-210-210-190-180 DEG C, pelletize obtains coating level poly- third
Alkene.
The coating grade polypropylene melt index of gained is 33.2g/10min, ash 216ppm, tensile yield strength 20.6MPa,
Bending moduluses 656MPa, room temperature simple beam impact strength 4.82kJ/m2, the first 104.8 DEG C of melting peak temperature, the second melting peak
143.5 DEG C of temperature.
Embodiment 6
By ethylene-propylene random copolymer (melt index is 24g/10min, ethylene contents are 4.1wt%) 90wt%, LDPE
(trade mark 1C7A) 10wt% in high-speed mixer and mixing uniformly, then carries out melt blending extrusion in double screw extruder, takes out
Vacuum, prilling temperature is 150-170-190-200-210-210-210-190-180 DEG C, and pelletize obtains coating grade polypropylene.
The coating grade polypropylene melt index of gained is 22.2g/10min, ash 196ppm, tensile yield strength 20.6MPa,
Bending moduluses 682MPa, room temperature simple beam impact strength 5.12kJ/m2, the first 104.3 DEG C of melting peak temperature, the second melting peak
142.6 DEG C of temperature.
Embodiment 7
By ethylene-propylene random copolymer (melt index is 24g/10min, ethylene contents are 4.1wt%) 90wt%, LDPE
(trade mark XL700) 10wt% in high-speed mixer and mixing uniformly, then carries out melt blending extrusion in double screw extruder,
Evacuation, prilling temperature is 150-170-190-200-210-210-210-190-180 DEG C, and pelletize obtains coating grade polypropylene.
The coating grade polypropylene melt index of gained is 22.8g/10min, ash 208ppm, tensile yield strength 21.0MPa,
Bending moduluses 693MPa, room temperature simple beam impact strength 4.96kJ/m2, the first 105.2 DEG C of melting peak temperature, the second melting peak
142.8 DEG C of temperature.
Embodiment 8
By ethylene-propylene random copolymer (melt index is 35g/10min, ethylene contents are 3.8wt%) 90wt%, LDPE
(trade mark XL700) 10wt% in high-speed mixer and mixing uniformly, then carries out melt blending extrusion in double screw extruder,
Evacuation, prilling temperature is 150-170-190-200-210-210-210-190-180 DEG C, and pelletize obtains coating grade polypropylene.
The coating grade polypropylene melt index of gained is 33.8g/10min, ash 177ppm, tensile yield strength 21.3MPa,
Bending moduluses 702MPa, room temperature simple beam impact strength 5.25kJ/m2, the first 104.8 DEG C of melting peak temperature, the second melting peak
143.2 DEG C of temperature.
Embodiment 9
By ethylene-propylene random copolymer (melt index is 35g/10min, ethylene contents are 3.8wt%) 90wt%, LDPE
(trade mark L705) 10wt% in high-speed mixer and mixing uniformly, then carries out melt blending extrusion in double screw extruder, takes out
Vacuum, prilling temperature is 150-170-190-200-210-210-210-190-180 DEG C, and pelletize obtains coating grade polypropylene.
The coating grade polypropylene melt index of gained is 31.2g/10min, ash 169ppm, tensile yield strength 21.8MPa,
Bending moduluses 687MPa, room temperature simple beam impact strength 4.86kJ/m2, the first 104.5 DEG C of melting peak temperature, the second melting peak
143.1 DEG C of temperature.
Summarized from above example, the melt index general control of polypropylene coating material is in 26.0-35.0g/10min, ash
Control less than 200ppm, tensile yield strength typically in 20.0-22.0MPa, bending moduluses typically in 650MPa,
Room temperature simple beam impact strength is typically in 4.6-5.6kJ/m2, the first melting peak temperature at 104 DEG C about, the second melting peak temperature
Between general 138-144 DEG C.
Above-described embodiment only technology design to illustrate the invention and feature, its object is to allow person skilled in the art's energy
Solution present disclosure much of that is simultaneously implemented according to this, can not be limited the scope of the invention with this, all spiritual according to the present invention
Equivalence changes or modification that essence is made, all should be included within the scope of the present invention.
Claims (6)
1. a kind of polypropene composition for BOPP film coating it is characterised in that in parts by weight, is grouped into by following group：
Polypropylene random copolymer 85-95 part, Low Density Polyethylene 5-15 part, the melt index of described polypropylene random copolymer is
20-38g/10min, in described polypropylene random copolymer, ethylene contents are 3.8-4.5wt%.
2. a kind of polypropene composition for BOPP film coating it is characterised in that in parts by weight, is grouped by following group
Become：Ene-propylene-butene random copolymer 85-95 part, Low Density Polyethylene 5-15 part, described polypropylene random copolymer
Melt index is 20-38g/10min, and in described ene-propylene-butene random copolymer, ethylene contents are 3.8-4.5wt%.
3. the polypropene composition for BOPP film coating according to claim 1 and 2 is it is characterised in that described low
The density polyethylene trade mark is coating level, and melt index is 6-16g/10min.
4. a kind of preparation method of the polypropene composition for BOPP film coating is it is characterised in that by polypropylene random copolymerization
Thing and Low Density Polyethylene in high-speed mixer and mixing uniformly, then carry out melt blending extrusion, finally in double screw extruder
Carry out pelletize and polypropene composition for BOPP film coating is obtained.
5. the polypropene composition for BOPP film coating according to claim 4 preparation method it is characterised in that
The temperature of described granulation process is 150-170-190-200-210-210-210-190-180 DEG C.
6. the preparation method of the polypropene composition for BOPP film coating according to claim 4 or 5, its feature exists
In wanting evacuation during melt blending in double screw extruder.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112239580A (en) * | 2019-07-17 | 2021-01-19 | 中国石油化工股份有限公司 | Polypropylene composition, polypropylene material, application thereof and milk powder cover |
| CN112961440A (en) * | 2019-11-28 | 2021-06-15 | 中国石油化工股份有限公司 | Polypropylene resin composition, preparation method thereof, film and preparation method thereof |
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| EP0564636B1 (en) * | 1991-10-29 | 2000-01-12 | Huntsman Corporation | Polypropylene extrusion coating resins and process for the production thereof |
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| CN104350071A (en) * | 2012-05-31 | 2015-02-11 | 博里利斯股份公司 | Ethylene polymers for extrusion coating |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112239580A (en) * | 2019-07-17 | 2021-01-19 | 中国石油化工股份有限公司 | Polypropylene composition, polypropylene material, application thereof and milk powder cover |
| CN112239580B (en) * | 2019-07-17 | 2022-09-20 | 中国石油化工股份有限公司 | Polypropylene composition, polypropylene material, application of polypropylene composition and polypropylene material and milk powder cover |
| CN112961440A (en) * | 2019-11-28 | 2021-06-15 | 中国石油化工股份有限公司 | Polypropylene resin composition, preparation method thereof, film and preparation method thereof |
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