CN106496764A - A kind of high-strength polyolefin heat shrink films and its production technology - Google Patents
A kind of high-strength polyolefin heat shrink films and its production technology Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
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- 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
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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
- 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
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- 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
- C08J2423/08—Copolymers of ethene
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- C08L2203/00—Applications
- C08L2203/16—Applications used for films
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
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Abstract
The invention discloses a kind of high-strength polyolefin heat shrink films, are made up of the following raw material according to weight portion：60 65 parts of metallocene linear-low density polyethylene, 23 27 parts of high density polyethylene (HDPE), 42 45 parts of ethylene-vinyl acetate copolymer, 10 13 parts of 1 amylene of poly- 4 methyl, 25 parts of nanoscale vermiculite power, 48 parts of urea, 2.5 4 parts of butyl stearate, 13 parts of fatty acid ester, 2 3.5 parts of pentaerythrite, 12 parts of ultra-violet absorber.The invention also discloses the production technology of the high-strength polyolefin heat shrink films.Polyolefin Heat Shrinkable Film prepared by the present invention, intensity are high, and disclosure satisfy that use demand in terms of elongation at break and light transmittance, with wide market prospects.
Description
Technical field
The present invention relates to heat-shrinkable film technology field, specifically a kind of high-strength polyolefin heat shrink films and its production work
Skill.
Background technology
Commodity packaging requires that there is the effect of protecting, guarantee the quality, beautifying commodity.There is humidity resistance in traditional packed in cases
Difference, package goods easily go mouldy, pressure poor performance, inconvenience transport and store, and the problems such as production cost is higher, and traditional tie up
, also there is the high and potential potential safety hazard of cost of labor in packaging.With people's living standard and to the continuous of material requisite level
Improve, traditional packaging material far can not meet needs.This situation is based on, researcher develops heat shrink films packaging and comes
Substitute packed in cases and enlacement packaging.
Heat shrink films are a kind of good film packing materials, are longitudinally and/or laterally drawn under elastomeric state using film
The energy storage that has stretched in the film, imitate by the memory that the form before the bi-directionally or uni-directionally stretching having using thermoplastic has
Should, the function of the form before recovering to stretch when heat is run into again is reaching packaging purpose.Heat shrink films should have good saturating
Bright property, the commodity that customer can be allowed to be immediately seen packaged are easy to customer's picking commodities.
Heat shrink films have obtained extensively should in fields such as food, medicine, beverages because of its excellent stability and security
With.Polyolefin Heat Shrinkable Film is exactly wherein common one kind.But existing Polyolefin Heat Shrinkable Film generally existing insufficient strength
Defect, it is difficult to meet the higher and higher performance requirement in market.
Content of the invention
It is an object of the invention to provide a kind of high-strength polyolefin heat shrink films and its production technology, to solve the above-mentioned back of the body
The problem proposed in scape technology.
For achieving the above object, the present invention provides following technical scheme：
A kind of high-strength polyolefin heat shrink films, are made up of the following raw material according to weight portion：The poly- second of metallocene linear low density
Alkene 60-65 parts, high density polyethylene (HDPE) 23-27 parts, ethylene-vinyl acetate copolymer 42-45 parts, poly(4-methyl-1-pentene) 10-13
Part, nanoscale vermiculite power 2-5 parts, urea 4-8 parts, butyl stearate 2.5-4 parts, fatty acid ester 1-3 parts, pentaerythrite 2-3.5
Part, ultra-violet absorber 1-2 parts.
As further scheme of the invention：It is made up of the following raw material according to weight portion：Metallocene linear low density gathers
Ethene 61-64 parts, high density polyethylene (HDPE) 24-26 parts, ethylene-vinyl acetate copolymer 43-44 parts, poly(4-methyl-1-pentene) 11-
12 parts, nanoscale vermiculite power 3-4 parts, urea 5-7 parts, butyl stearate 3-3.5 parts, fatty acid ester 1.5-2.7 parts, pentaerythrite
2.3-3.1 part, ultra-violet absorber 1.2-1.7 parts.
As further scheme of the invention：It is made up of the following raw material according to weight portion：Metallocene linear low density
62 parts of polyethylene, 25 parts of high density polyethylene (HDPE), 43.5 parts of ethylene-vinyl acetate copolymer, 11.8 parts of poly(4-methyl-1-pentene),
3.4 parts of nanoscale vermiculite power, 6 parts of urea, 3.3 parts of butyl stearate, 2.1 parts of fatty acid ester, 2.6 parts of pentaerythrite, ultraviolet
1.5 parts of absorbent.
As further scheme of the invention：The ultra-violet absorber is ultraviolet absorbent UV-531.
The production technology of the high-strength polyolefin heat shrink films, step are as follows：
1）Urea and nanoscale vermiculite power is weighed, urea is warming up to 140-150 DEG C, after urea is melted completely, put into nanometer
Level vermiculite power, under the rotating speed of 150-180rpm, stirring mixing 1-2h, obtains additive package；
2）Weigh metallocene linear-low density polyethylene, high density polyethylene (HDPE), poly(4-methyl-1-pentene), butyl stearate and fat
Fat acid esters, the preheating for putting into extremely are in 85-95 DEG C of reactor, are warming up to 245-253 DEG C, stir under the rotating speed of 100-120rpm
Mixing 20-30min is mixed, the first mixture is obtained；
3）Reactor is warming up to 262-265 DEG C, is weighed and is added pentaerythrite, stirring mixing under the rotating speed of 160-200rpm
50-60min, obtains the second mixture；
4）Reactor is cooled to 150-160 DEG C, additive package, ultra-violet absorber and ethene-vinyl acetate copolymerization is added
Thing, under the rotating speed of 130-150 rpm, stirring mixing 1-2h, obtains total melt；
5）Total melt is first passed through screw extruder extrusion, then is extruded by individual layer inflation film manufacturing machine, after drying, obtain pipe；
6）After pipe is preheated, send in stretching case, carry out biaxial tension process, obtain the film that thickness is for 20-25 μm, i.e.,
Can, the temperature of the biaxial tension is 99-103 DEG C.
Compared with prior art, the invention has the beneficial effects as follows：
1st, Polyolefin Heat Shrinkable Film prepared by the present invention, intensity are high, and tensile strength has reached more than 53.2Mpa, and stretches in fracture
Use demand disclosure satisfy that in terms of long rate and light transmittance, with wide market prospects.2nd, the present invention by add urea and
Nanoscale vermiculite power, and using the production technology of the present invention, it is possible to increase thermal contraction film strength, market is met to heat shrink films
Higher and higher performance requirement.
Specific embodiment
Technical scheme is described in more detail with reference to specific embodiment.
Embodiment 1
A kind of high-strength polyolefin heat shrink films, are made up of the following raw material according to weight portion：The poly- second of metallocene linear low density
60 parts of alkene, 23 parts of high density polyethylene (HDPE), 42 parts of ethylene-vinyl acetate copolymer, 10 parts of poly(4-methyl-1-pentene), nanoscale leech
2 parts of stone flour, 4 parts of urea, 2.5 parts of butyl stearate, 1 part of fatty acid ester, 2 parts of pentaerythrite, 1 part of ultra-violet absorber；Wherein,
The ultra-violet absorber is ultraviolet absorbent UV-531.
The production technology of high-strength polyolefin heat shrink films described in the present embodiment, step are as follows：
1）Urea and nanoscale vermiculite power is weighed, urea is warming up to 140 DEG C, after urea is melted completely, put into nanoscale leech
Stone flour, under the rotating speed of 150rpm, stirring mixing 1h, obtains additive package；
2）Weigh metallocene linear-low density polyethylene, high density polyethylene (HDPE), poly(4-methyl-1-pentene), butyl stearate and fat
Fat acid esters, puts into preheating extremely for, in 85 DEG C of reactor, being warming up to 245 DEG C, stirring mixing under the rotating speed of 100rpm
20min, obtains the first mixture；
3）Reactor is warming up to 262 DEG C, is weighed and is added pentaerythrite, stirring mixing 50min, obtains under the rotating speed of 160rpm
Obtain the second mixture；
4）Reactor is cooled to 150 DEG C, additive package, ultra-violet absorber and ethylene-vinyl acetate copolymer is added,
Under the rotating speed of 130rpm, stirring mixing 1h, obtains total melt；
5）Total melt is first passed through screw extruder extrusion, then is extruded by individual layer inflation film manufacturing machine, after drying, obtain pipe；
6）After pipe is preheated, send in stretching case, carry out biaxial tension process, obtain the film that thickness is 20 μm, you can, institute
The temperature for stating biaxial tension is 99 DEG C.
Embodiment 2
A kind of high-strength polyolefin heat shrink films, are made up of the following raw material according to weight portion：The poly- second of metallocene linear low density
61 parts of alkene, 24 parts of high density polyethylene (HDPE), 45 parts of ethylene-vinyl acetate copolymer, 11 parts of poly(4-methyl-1-pentene), nanoscale leech
2 parts of stone flour, 5 parts of urea, 3 parts of butyl stearate, 1.5 parts of fatty acid ester, 2 parts of pentaerythrite, 1.3 parts of ultra-violet absorber；Its
In, the ultra-violet absorber is ultraviolet absorbent UV-531.
The production technology of high-strength polyolefin heat shrink films described in the present embodiment, step are as follows：
1）Urea and nanoscale vermiculite power is weighed, urea is warming up to 143 DEG C, after urea is melted completely, put into nanoscale leech
Stone flour, under the rotating speed of 160rpm, stirring mixing 1h, obtains additive package；
2）Weigh metallocene linear-low density polyethylene, high density polyethylene (HDPE), poly(4-methyl-1-pentene), butyl stearate and fat
Fat acid esters, puts into preheating extremely for, in 87 DEG C of reactor, being warming up to 245 DEG C, stirring mixing under the rotating speed of 100rpm
20min, obtains the first mixture；
3）Reactor is warming up to 265 DEG C, is weighed and is added pentaerythrite, stirring mixing 55min, obtains under the rotating speed of 170rpm
Obtain the second mixture；
4）Reactor is cooled to 150 DEG C, additive package, ultra-violet absorber and ethylene-vinyl acetate copolymer is added,
Under the rotating speed of 140 rpm, stirring mixing 1h, obtains total melt；
5）Total melt is first passed through screw extruder extrusion, then is extruded by individual layer inflation film manufacturing machine, after drying, obtain pipe；
6）After pipe is preheated, send in stretching case, carry out biaxial tension process, obtain the film that thickness is 22 μm, you can, institute
The temperature for stating biaxial tension is 100 DEG C.
Embodiment 3
A kind of high-strength polyolefin heat shrink films, are made up of the following raw material according to weight portion：The poly- second of metallocene linear low density
62 parts of alkene, 25 parts of high density polyethylene (HDPE), 43.5 parts of ethylene-vinyl acetate copolymer, poly(4-methyl-1-pentene) 11.8 part, nanometer
3.4 parts of vermiculite power of level, 6 parts of urea, 3.3 parts of butyl stearate, 2.1 parts of fatty acid ester, 2.6 parts of pentaerythrite, ultraviolet radiation absorption
1.5 parts of agent；Wherein, the ultra-violet absorber is ultraviolet absorbent UV-531.
The production technology of high-strength polyolefin heat shrink films described in the present embodiment, step are as follows：
1）Urea and nanoscale vermiculite power is weighed, urea is warming up to 145 DEG C, after urea is melted completely, put into nanoscale leech
Stone flour, under the rotating speed of 160rpm, stirring mixing 1.5h, obtains additive package；
2）Weigh metallocene linear-low density polyethylene, high density polyethylene (HDPE), poly(4-methyl-1-pentene), butyl stearate and fat
Fat acid esters, puts into preheating extremely for, in 90 DEG C of reactor, being warming up to 248 DEG C, stirring mixing under the rotating speed of 110rpm
25min, obtains the first mixture；
3）Reactor is warming up to 264 DEG C, is weighed and is added pentaerythrite, stirring mixing 55min, obtains under the rotating speed of 180rpm
Obtain the second mixture；
4）Reactor is cooled to 155 DEG C, additive package, ultra-violet absorber and ethylene-vinyl acetate copolymer is added,
Under the rotating speed of 140 rpm, stirring mixing 1.5h, obtains total melt；
5）Total melt is first passed through screw extruder extrusion, then is extruded by individual layer inflation film manufacturing machine, after drying, obtain pipe；
6）After pipe is preheated, send in stretching case, carry out biaxial tension process, obtain the film that thickness is 23 μm, you can, institute
The temperature for stating biaxial tension is 101 DEG C.
Embodiment 4
A kind of high-strength polyolefin heat shrink films, are made up of the following raw material according to weight portion：The poly- second of metallocene linear low density
64 parts of alkene, 25 parts of high density polyethylene (HDPE), 42 parts of ethylene-vinyl acetate copolymer, 12 parts of poly(4-methyl-1-pentene), nanoscale leech
4 parts of stone flour, 4 parts of urea, 3 parts of butyl stearate, 1.5 parts of fatty acid ester, 3.5 parts of pentaerythrite, 1.6 parts of ultra-violet absorber；
Wherein, the ultra-violet absorber is ultraviolet absorbent UV-531.
The production technology of high-strength polyolefin heat shrink films described in the present embodiment, step are as follows：
1）Urea and nanoscale vermiculite power is weighed, urea is warming up to 147 DEG C, after urea is melted completely, put into nanoscale leech
Stone flour, under the rotating speed of 170rpm, stirring mixing 2h, obtains additive package；
2）Weigh metallocene linear-low density polyethylene, high density polyethylene (HDPE), poly(4-methyl-1-pentene), butyl stearate and fat
Fat acid esters, puts into preheating extremely for, in 95 DEG C of reactor, being warming up to 250 DEG C, stirring mixing under the rotating speed of 110rpm
25min, obtains the first mixture；
3）Reactor is warming up to 264 DEG C, is weighed and is added pentaerythrite, stirring mixing 56min, obtains under the rotating speed of 180rpm
Obtain the second mixture；
4）Reactor is cooled to 156 DEG C, additive package, ultra-violet absorber and ethylene-vinyl acetate copolymer is added,
Under the rotating speed of 142 rpm, stirring mixing 1.5h, obtains total melt；
5）Total melt is first passed through screw extruder extrusion, then is extruded by individual layer inflation film manufacturing machine, after drying, obtain pipe；
6）After pipe is preheated, send in stretching case, carry out biaxial tension process, obtain the film that thickness is 22 μm, you can, institute
The temperature for stating biaxial tension is 103 DEG C.
Embodiment 5
A kind of high-strength polyolefin heat shrink films, are made up of the following raw material according to weight portion：The poly- second of metallocene linear low density
65 parts of alkene, 27 parts of high density polyethylene (HDPE), 45 parts of ethylene-vinyl acetate copolymer, 13 parts of poly(4-methyl-1-pentene), nanoscale leech
5 parts of stone flour, 8 parts of urea, 4 parts of butyl stearate, 3 parts of fatty acid ester, 3.5 parts of pentaerythrite, 2 parts of ultra-violet absorber；Wherein,
The ultra-violet absorber is ultraviolet absorbent UV-531.
The production technology of high-strength polyolefin heat shrink films described in the present embodiment, step are as follows：
1）Urea and nanoscale vermiculite power is weighed, urea is warming up to 150 DEG C, after urea is melted completely, put into nanoscale leech
Stone flour, under the rotating speed of 180rpm, stirring mixing 2h, obtains additive package；
2）Weigh metallocene linear-low density polyethylene, high density polyethylene (HDPE), poly(4-methyl-1-pentene), butyl stearate and fat
Fat acid esters, puts into preheating extremely for, in 95 DEG C of reactor, being warming up to 253 DEG C, stirring mixing under the rotating speed of 120rpm
30min, obtains the first mixture；
3）Reactor is warming up to 265 DEG C, is weighed and is added pentaerythrite, stirring mixing 60min, obtains under the rotating speed of 200rpm
Obtain the second mixture；
4）Reactor is cooled to 160 DEG C, additive package, ultra-violet absorber and ethylene-vinyl acetate copolymer is added,
Under the rotating speed of 150 rpm, stirring mixing 2h, obtains total melt；
5）Total melt is first passed through screw extruder extrusion, then is extruded by individual layer inflation film manufacturing machine, after drying, obtain pipe；
6）After pipe is preheated, send in stretching case, carry out biaxial tension process, obtain the film that thickness is 25 μm, you can, institute
The temperature for stating biaxial tension is 103 DEG C.
Comparative example
Compared with Example 3, without urea and nanoscale vermiculite power, other are same as Example 3.
Performance test is carried out to the heat shrink films prepared by embodiment 1-5 and comparative example, test result is as shown in table 1.
1 performance test table of table
| Group | Tensile strength（MPa） | Elongation at break（%） | Light transmittance（%） |
| Embodiment 1 | 53.2 | 457 | 86.5 |
| Embodiment 2 | 54.6 | 436 | 86.4 |
| Embodiment 3 | 55.7 | 441 | 87.3 |
| Embodiment 4 | 55.3 | 428 | 87.5 |
| Embodiment 5 | 53.5 | 473 | 86.7 |
| Comparative example | 41.8 | 456 | 87.1 |
As can be seen from the above table, the Polyolefin Heat Shrinkable Film that prepared by the present invention, intensity are high, tensile strength reached 53.2Mpa with
On, and use demand is disclosure satisfy that in terms of elongation at break and light transmittance, with wide market prospects.
Compared with comparative example, in terms of tensile strength, embodiment 3 is better than comparative example to embodiment 3, in elongation at break and thoroughly
In terms of light rate, without obvious difference between embodiment 3 and comparative example.Due to comparative example compared with Example 3, without urea and
Nanoscale vermiculite power, other are same as Example 3, it can therefore be seen that the present invention is by adding urea and nanoscale vermiculite power,
Thermal contraction film strength can be improved.
Above the better embodiment of the present invention is explained in detail, but the present invention is not limited to above-mentioned embodiment party
Formula, in the ken that one skilled in the relevant art possesses, can be with the premise of without departing from present inventive concept
Various changes can be made.
Claims (5)
1. a kind of high-strength polyolefin heat shrink films, it is characterised in that be made up of the following raw material according to weight portion：Metallocene line
Property low density polyethylene (LDPE) 60-65 parts, high density polyethylene (HDPE) 23-27 parts, ethylene-vinyl acetate copolymer 42-45 parts, poly- 4- first
Base -1- amylene 10-13 parts, nanoscale vermiculite power 2-5 parts, urea 4-8 parts, butyl stearate 2.5-4 parts, fatty acid ester 1-3 parts,
Pentaerythrite 2-3.5 parts, ultra-violet absorber 1-2 parts.
2. high-strength polyolefin heat shrink films according to claim 1, it is characterised in that by the following original according to weight portion
Material composition：Metallocene linear-low density polyethylene 61-64 parts, high density polyethylene (HDPE) 24-26 parts, ethylene-vinyl acetate copolymer
43-44 parts, poly(4-methyl-1-pentene) 11-12 parts, nanoscale vermiculite power 3-4 parts, urea 5-7 parts, butyl stearate 3-3.5 parts,
Fatty acid ester 1.5-2.7 parts, pentaerythrite 2.3-3.1 parts, ultra-violet absorber 1.2-1.7 parts.
3. high-strength polyolefin heat shrink films according to claim 2, it is characterised in that by the following original according to weight portion
Material composition：62 parts of metallocene linear-low density polyethylene, 25 parts of high density polyethylene (HDPE), 43.5 parts of ethylene-vinyl acetate copolymer,
11.8 parts of poly(4-methyl-1-pentene), 3.4 parts of nanoscale vermiculite power, 6 parts of urea, 3.3 parts of butyl stearate, fatty acid ester 2.1
Part, 2.6 parts of pentaerythrite, 1.5 parts of ultra-violet absorber.
4. high-strength polyolefin heat shrink films according to claim 3, it is characterised in that the ultra-violet absorber is purple
Ultraviolet absorbers UV-531.
5. a kind of production technology of the high-strength polyolefin heat shrink films as described in claim 1-4 is arbitrary, it is characterised in that step
Rapid as follows：
1）Urea and nanoscale vermiculite power is weighed, urea is warming up to 140-150 DEG C, after urea is melted completely, put into nanometer
Level vermiculite power, under the rotating speed of 150-180rpm, stirring mixing 1-2h, obtains additive package；
2）Weigh metallocene linear-low density polyethylene, high density polyethylene (HDPE), poly(4-methyl-1-pentene), butyl stearate and fat
Fat acid esters, the preheating for putting into extremely are in 85-95 DEG C of reactor, are warming up to 245-253 DEG C, stir under the rotating speed of 100-120rpm
Mixing 20-30min is mixed, the first mixture is obtained；
3）Reactor is warming up to 262-265 DEG C, is weighed and is added pentaerythrite, stirring mixing under the rotating speed of 160-200rpm
50-60min, obtains the second mixture；
4）Reactor is cooled to 150-160 DEG C, additive package, ultra-violet absorber and ethene-vinyl acetate copolymerization is added
Thing, under the rotating speed of 130-150 rpm, stirring mixing 1-2h, obtains total melt；
5）Total melt is first passed through screw extruder extrusion, then is extruded by individual layer inflation film manufacturing machine, after drying, obtain pipe；
6）After pipe is preheated, send in stretching case, carry out biaxial tension process, obtain the film that thickness is for 20-25 μm, i.e.,
Can, the temperature of the biaxial tension is 99-103 DEG C.
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| CN201611145101.3A CN106496764B (en) | 2016-12-13 | 2016-12-13 | A kind of high-strength polyolefin heat shrink films and its production technology |
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| CN201611145101.3A CN106496764B (en) | 2016-12-13 | 2016-12-13 | A kind of high-strength polyolefin heat shrink films and its production technology |
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