CN106496764B - 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 PDF

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CN106496764B
CN106496764B CN201611145101.3A CN201611145101A CN106496764B CN 106496764 B CN106496764 B CN 106496764B CN 201611145101 A CN201611145101 A CN 201611145101A CN 106496764 B CN106496764 B CN 106496764B
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density polyethylene
urea
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shrink films
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CN106496764A (en
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尹强
王震
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SHANDONG ZHONGSU TAIFU TECHNOLOGY Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • 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
    • 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
    • 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
    • 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
    • C08J2423/08—Copolymers of ethene
    • 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
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/16—Applications used for films
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/062—HDPE

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  • Engineering & Computer Science (AREA)
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  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
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Abstract

The invention discloses a kind of high-strength polyolefin heat shrink films, are made of the raw material below according to parts by weight: 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 poly(4-methyl-1-pentene), 2-5 parts of nanoscale vermiculite power, 4-8 parts of urea, 2.5-4 parts of butyl stearate, 1-3 parts of aliphatic ester, 2-3.5 parts of pentaerythrite, 1-2 parts of ultraviolet absorbing agent.The invention also discloses the production technologies of the high-strength polyolefin heat shrink films.Polyolefin Heat Shrinkable Film prepared by the present invention, intensity is high, and can satisfy use demand in terms of elongation at break and light transmittance, has a vast market foreground.

Description

A kind of high-strength polyolefin heat shrink films and its production technology
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 technique
Commodity packaging requires the effect of protection, commodity of guaranteeing the quality, beautify.There are humidity resistances for traditional packed in cases Difference, package goods are easy mildew, and pressure-resistant performance is poor, inconvenience transport and storage, the problems such as production cost is higher, and traditional tie up , also there is high labor cost and potential security risk in packaging.With people's living standard and to the continuous of material requisite level It improves, traditional packaging material is far from satisfying needs.Based on this situation, 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 stretched in the film, imitate by the memory that the form before the bi-directionally or uni-directionally stretching having using thermoplastic has It answers, the function of the form before stretching can be restored when encountering heat again to reach packaging purpose.Heat shrink films should have good Bright property, can allow customer to be immediately seen the commodity being packaged, and be convenient for customer's picking commodities.
Heat shrink films have obtained answering extensively because of its excellent stability and safety, in fields such as food, drug, beverages With.Polyolefin Heat Shrinkable Film is exactly wherein common one kind.But the existing generally existing intensity of Polyolefin Heat Shrinkable Film is inadequate Defect, it is difficult to meet the higher and higher performance requirement in market.
Summary of the invention
The purpose of the present invention is to provide a kind of high-strength polyolefin heat shrink films and its production technologies, to solve above-mentioned back The problem of being proposed in scape technology.
To achieve the above object, the invention provides the following technical scheme:
A kind of high-strength polyolefin heat shrink films, are made of: metallocene linear low density the raw material below according to parts by weight 60-65 parts of polyethylene, 23-27 parts of high density polyethylene (HDPE), 42-45 parts of ethylene-vinyl acetate copolymer, poly(4-methyl-1-pentene) 10-13 parts, 2-5 parts of nanoscale vermiculite power, 4-8 parts of urea, 2.5-4 parts of butyl stearate, 1-3 parts of aliphatic ester, pentaerythrite 2-3.5 parts, 1-2 parts of ultraviolet absorbing agent.
As a further solution of the present invention: be made of the raw material below according to parts by weight: metallocene linear low density is poly- 61-64 parts of ethylene, 24-26 parts of high density polyethylene (HDPE), 43-44 parts of ethylene-vinyl acetate copolymer, poly(4-methyl-1-pentene) 11- 12 parts, 3-4 parts of nanoscale vermiculite power, 5-7 parts of urea, 3-3.5 parts of butyl stearate, 1.5-2.7 parts of aliphatic ester, pentaerythrite 2.3-3.1 1.2-1.7 parts of part, ultraviolet absorbing agent.
As further scheme of the invention: being made of the raw material below according to parts by weight: 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 aliphatic ester, 2.6 parts of pentaerythrite, ultraviolet light 1.5 parts of absorbent.
As further scheme of the invention: the ultraviolet absorbing agent is ultraviolet absorbent UV-531.
The production technology of the high-strength polyolefin heat shrink films, steps are as follows:
1) urea and nanoscale vermiculite power are weighed, urea is warming up to 140-150 DEG C, after urea melts completely, investment Nanoscale vermiculite power is stirred 1-2h under the revolving speed of 150-180rpm, obtains additive package；
2) metallocene linear-low density polyethylene, high density polyethylene (HDPE), poly(4-methyl-1-pentene), butyl stearate are weighed And aliphatic ester, it puts into the reaction kettle that preheating extremely is 85-95 DEG C, 245-253 DEG C is warming up to, in the revolving speed of 100-120rpm Under be stirred 20-30min, obtain the first mixture；
3) reaction kettle is warming up to 262-265 DEG C, weighs and be added pentaerythrite, stirred under the revolving speed of 160-200rpm 50-60min is mixed, the second mixture is obtained；
4) reaction kettle is cooled to 150-160 DEG C, additive package, ultraviolet absorbing agent and ethene-vinyl acetate is added Copolymer is stirred 1-2h under the revolving speed of 130-150 rpm, obtains total melt；
5) total melt is first passed through screw extruder to squeeze out, then is squeezed out by single layer inflation film manufacturing machine, after dry, obtain pipe；
6) it after preheating pipe, is sent into and stretches in case, carry out biaxial tension processing, obtain the film with a thickness of 20-25 μm, , the temperature of the biaxial tension is 99-103 DEG C.
Compared with prior art, the beneficial effects of the present invention are:
1, Polyolefin Heat Shrinkable Film prepared by the present invention, intensity is high, and tensile strength has reached 53.2Mpa or more, and disconnected It can satisfy use demand in terms of splitting elongation and light transmittance, have a vast market foreground.2, the present invention passes through addition urine Element and nanoscale vermiculite power, and production technology of the invention is used, it can be improved thermal contraction film strength, meet market and heat is received The higher and higher performance requirement of contracting film.
Specific embodiment
Technical solution of the present invention is described in more detail With reference to embodiment.
Embodiment 1
A kind of high-strength polyolefin heat shrink films, are made of: metallocene linear low density the raw material below according to parts by weight 60 parts of polyethylene, 23 parts of high density polyethylene (HDPE), 42 parts of ethylene-vinyl acetate copolymer, poly(4-methyl-1-pentene) 10 part, nanometer Grade 2 parts of vermiculite power, 4 parts of urea, 2.5 parts of butyl stearate, 1 part of aliphatic ester, 2 parts of pentaerythrite, 1 part of ultraviolet absorbing agent； Wherein, the ultraviolet absorbing agent is ultraviolet absorbent UV-531.
The production technology of high-strength polyolefin heat shrink films described in the present embodiment, steps are as follows:
1) urea and nanoscale vermiculite power are weighed, urea is warming up to 140 DEG C, after urea melts completely, puts into nanometer Grade vermiculite power, is stirred 1h under the revolving speed of 150rpm, obtains additive package；
2) metallocene linear-low density polyethylene, high density polyethylene (HDPE), poly(4-methyl-1-pentene), butyl stearate are weighed And aliphatic ester, it puts into the reaction kettle that preheating extremely is 85 DEG C, is warming up to 245 DEG C, is stirred under the revolving speed of 100rpm 20min obtains the first mixture；
3) reaction kettle is warming up to 262 DEG C, weighs and be added pentaerythrite, be stirred under the revolving speed of 160rpm 50min obtains the second mixture；
4) reaction kettle is cooled to 150 DEG C, additive package, ultraviolet absorbing agent and ethene-vinyl acetate copolymerization is added Object is stirred 1h under the revolving speed of 130rpm, obtains total melt；
5) total melt is first passed through screw extruder to squeeze out, then is squeezed out by single layer inflation film manufacturing machine, after dry, obtain pipe；
6) it after preheating pipe, is sent into and stretches in case, carry out biaxial tension processing, obtain the film with a thickness of 20 μm, i.e., Can, the temperature of the biaxial tension is 99 DEG C.
Embodiment 2
A kind of high-strength polyolefin heat shrink films, are made of: metallocene linear low density the raw material below according to parts by weight 61 parts of polyethylene, 24 parts of high density polyethylene (HDPE), 45 parts of ethylene-vinyl acetate copolymer, poly(4-methyl-1-pentene) 11 part, nanometer Grade 2 parts of vermiculite power, 5 parts of urea, 3 parts of butyl stearate, 1.5 parts of aliphatic ester, 2 parts of pentaerythrite, ultraviolet absorbing agent 1.3 Part；Wherein, the ultraviolet absorbing agent is ultraviolet absorbent UV-531.
The production technology of high-strength polyolefin heat shrink films described in the present embodiment, steps are as follows:
1) urea and nanoscale vermiculite power are weighed, urea is warming up to 143 DEG C, after urea melts completely, puts into nanometer Grade vermiculite power, is stirred 1h under the revolving speed of 160rpm, obtains additive package；
2) metallocene linear-low density polyethylene, high density polyethylene (HDPE), poly(4-methyl-1-pentene), butyl stearate are weighed And aliphatic ester, it puts into the reaction kettle that preheating extremely is 87 DEG C, is warming up to 245 DEG C, is stirred under the revolving speed of 100rpm 20min obtains the first mixture；
3) reaction kettle is warming up to 265 DEG C, weighs and be added pentaerythrite, be stirred under the revolving speed of 170rpm 55min obtains the second mixture；
4) reaction kettle is cooled to 150 DEG C, additive package, ultraviolet absorbing agent and ethene-vinyl acetate copolymerization is added Object is stirred 1h under the revolving speed of 140 rpm, obtains total melt；
5) total melt is first passed through screw extruder to squeeze out, then is squeezed out by single layer inflation film manufacturing machine, after dry, obtain pipe；
6) it after preheating pipe, is sent into and stretches in case, carry out biaxial tension processing, obtain the film with a thickness of 22 μm, i.e., Can, the temperature of the biaxial tension is 100 DEG C.
Embodiment 3
A kind of high-strength polyolefin heat shrink films, are made of: metallocene linear low density the raw material below according to parts by weight 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 aliphatic ester, 2.6 parts of pentaerythrite, ultraviolet light 1.5 parts of absorbent；Wherein, the ultraviolet absorbing agent is ultraviolet absorbent UV-531.
The production technology of high-strength polyolefin heat shrink films described in the present embodiment, steps are as follows:
1) urea and nanoscale vermiculite power are weighed, urea is warming up to 145 DEG C, after urea melts completely, puts into nanometer Grade vermiculite power, is stirred 1.5h under the revolving speed of 160rpm, obtains additive package；
2) metallocene linear-low density polyethylene, high density polyethylene (HDPE), poly(4-methyl-1-pentene), butyl stearate are weighed And aliphatic ester, it puts into the reaction kettle that preheating extremely is 90 DEG C, is warming up to 248 DEG C, is stirred under the revolving speed of 110rpm 25min obtains the first mixture；
3) reaction kettle is warming up to 264 DEG C, weighs and be added pentaerythrite, be stirred under the revolving speed of 180rpm 55min obtains the second mixture；
4) reaction kettle is cooled to 155 DEG C, additive package, ultraviolet absorbing agent and ethene-vinyl acetate copolymerization is added Object is stirred 1.5h under the revolving speed of 140 rpm, obtains total melt；
5) total melt is first passed through screw extruder to squeeze out, then is squeezed out by single layer inflation film manufacturing machine, after dry, obtain pipe；
6) it after preheating pipe, is sent into and stretches in case, carry out biaxial tension processing, obtain the film with a thickness of 23 μm, i.e., Can, the temperature of the biaxial tension is 101 DEG C.
Embodiment 4
A kind of high-strength polyolefin heat shrink films, are made of: metallocene linear low density the raw material below according to parts by weight 64 parts of polyethylene, 25 parts of high density polyethylene (HDPE), 42 parts of ethylene-vinyl acetate copolymer, poly(4-methyl-1-pentene) 12 part, nanometer Grade 4 parts of vermiculite power, 4 parts of urea, 3 parts of butyl stearate, 1.5 parts of aliphatic ester, 3.5 parts of pentaerythrite, ultraviolet absorbing agent 1.6 Part；Wherein, the ultraviolet absorbing agent is ultraviolet absorbent UV-531.
The production technology of high-strength polyolefin heat shrink films described in the present embodiment, steps are as follows:
1) urea and nanoscale vermiculite power are weighed, urea is warming up to 147 DEG C, after urea melts completely, puts into nanometer Grade vermiculite power, is stirred 2h under the revolving speed of 170rpm, obtains additive package；
2) metallocene linear-low density polyethylene, high density polyethylene (HDPE), poly(4-methyl-1-pentene), butyl stearate are weighed And aliphatic ester, it puts into the reaction kettle that preheating extremely is 95 DEG C, is warming up to 250 DEG C, is stirred under the revolving speed of 110rpm 25min obtains the first mixture；
3) reaction kettle is warming up to 264 DEG C, weighs and be added pentaerythrite, be stirred under the revolving speed of 180rpm 56min obtains the second mixture；
4) reaction kettle is cooled to 156 DEG C, additive package, ultraviolet absorbing agent and ethene-vinyl acetate copolymerization is added Object is stirred 1.5h under the revolving speed of 142 rpm, obtains total melt；
5) total melt is first passed through screw extruder to squeeze out, then is squeezed out by single layer inflation film manufacturing machine, after dry, obtain pipe；
6) it after preheating pipe, is sent into and stretches in case, carry out biaxial tension processing, obtain the film with a thickness of 22 μm, i.e., Can, the temperature of the biaxial tension is 103 DEG C.
Embodiment 5
A kind of high-strength polyolefin heat shrink films, are made of: metallocene linear low density the raw material below according to parts by weight 65 parts of polyethylene, 27 parts of high density polyethylene (HDPE), 45 parts of ethylene-vinyl acetate copolymer, poly(4-methyl-1-pentene) 13 part, nanometer Grade 5 parts of vermiculite power, 8 parts of urea, 4 parts of butyl stearate, 3 parts of aliphatic ester, 3.5 parts of pentaerythrite, 2 parts of ultraviolet absorbing agent； Wherein, the ultraviolet absorbing agent is ultraviolet absorbent UV-531.
The production technology of high-strength polyolefin heat shrink films described in the present embodiment, steps are as follows:
1) urea and nanoscale vermiculite power are weighed, urea is warming up to 150 DEG C, after urea melts completely, puts into nanometer Grade vermiculite power, is stirred 2h under the revolving speed of 180rpm, obtains additive package；
2) metallocene linear-low density polyethylene, high density polyethylene (HDPE), poly(4-methyl-1-pentene), butyl stearate are weighed And aliphatic ester, it puts into the reaction kettle that preheating extremely is 95 DEG C, is warming up to 253 DEG C, is stirred under the revolving speed of 120rpm 30min obtains the first mixture；
3) reaction kettle is warming up to 265 DEG C, weighs and be added pentaerythrite, be stirred under the revolving speed of 200rpm 60min obtains the second mixture；
4) reaction kettle is cooled to 160 DEG C, additive package, ultraviolet absorbing agent and ethene-vinyl acetate copolymerization is added Object is stirred 2h under the revolving speed of 150 rpm, obtains total melt；
5) total melt is first passed through screw extruder to squeeze out, then is squeezed out by single layer inflation film manufacturing machine, after dry, obtain pipe；
6) it after preheating pipe, is sent into and stretches in case, carry out biaxial tension processing, obtain the film with a thickness of 25 μm, i.e., Can, the temperature of the biaxial tension is 103 DEG C.
Comparative example
Compared with Example 3, urea and nanoscale vermiculite power are free of, other are same as Example 3.
Heat shrink films prepared by embodiment 1-5 and comparative example are tested for the property, 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, Polyolefin Heat Shrinkable Film prepared by the present invention, intensity is high, and tensile strength reaches 53.2Mpa or more, and can satisfy use demand in terms of elongation at break and light transmittance, it has a vast market foreground.
Embodiment 3 is compared with comparative example, and in terms of tensile strength, embodiment 3 is better than comparative example, in elongation at break and thoroughly In terms of light rate, without apparent difference between embodiment 3 and comparative example.Compared with Example 3 due to comparative example, without urea and Nanoscale vermiculite power, other are same as Example 3, therefore, it can be seen that the present invention passes through addition urea and nanoscale vermiculite power, It can be improved thermal contraction film strength.
Better embodiment of the invention is explained in detail above, but the present invention is not limited to above-mentioned embodiment party Formula within the knowledge of one of ordinary skill in the art can also be without departing from the purpose of the present invention Various changes can be made.

Claims (4)

1. a kind of high-strength polyolefin heat shrink films, which is characterized in that be made of the raw material below according to parts by weight: metallocene line Property 60-65 parts of low density polyethylene (LDPE), 23-27 parts of high density polyethylene (HDPE), 42-45 parts of ethylene-vinyl acetate copolymer, poly- 4- first 10-13 parts of base -1- amylene, 2-5 parts of nanoscale vermiculite power, 4-8 parts of urea, 2.5-4 parts of butyl stearate, 1-3 parts of aliphatic ester, 2-3.5 parts of pentaerythrite, 1-2 parts of ultraviolet absorbing agent；
The production technology of the high-strength polyolefin heat shrink films, steps are as follows:
1) urea and nanoscale vermiculite power are weighed, urea is warming up to 140-150 DEG C, after urea melts completely, puts into nanometer Grade vermiculite power, is stirred 1-2h under the revolving speed of 150-180rpm, obtains additive package；
2) metallocene linear-low density polyethylene, high density polyethylene (HDPE), poly(4-methyl-1-pentene), butyl stearate and rouge are weighed Fat acid esters puts into the reaction kettle that preheating extremely is 85-95 DEG C, is warming up to 245-253 DEG C, stirs under the revolving speed of 100-120rpm Mixing 20-30min is mixed, the first mixture is obtained；
3) reaction kettle is warming up to 262-265 DEG C, weighs and be added pentaerythrite, be stirred under the revolving speed of 160-200rpm 50-60min obtains the second mixture；
4) reaction kettle is cooled to 150-160 DEG C, additive package, ultraviolet absorbing agent and ethene-vinyl acetate copolymerization is added Object is stirred 1-2h under the revolving speed of 130-150 rpm, obtains total melt；
5) total melt is first passed through screw extruder to squeeze out, then is squeezed out by single layer inflation film manufacturing machine, after dry, obtain pipe；
6) it after preheating pipe, is sent into and stretches in case, carry out biaxial tension processing, obtain the film with a thickness of 20-25 μm, i.e., Can, the temperature of the biaxial tension is 99-103 DEG C.
2. high-strength polyolefin heat shrink films according to claim 1, which is characterized in that by below according to the original of parts by weight Material composition: 61-64 parts of metallocene linear-low density polyethylene, 24-26 parts of high density polyethylene (HDPE), ethylene-vinyl acetate copolymer 43-44 parts, 11-12 parts of poly(4-methyl-1-pentene), 3-4 parts of nanoscale vermiculite power, 5-7 parts of urea, 3-3.5 parts of butyl stearate, 1.5-2.7 parts of aliphatic ester, 2.3-3.1 parts of pentaerythrite, 1.2-1.7 parts of ultraviolet absorbing agent.
3. high-strength polyolefin heat shrink films according to claim 2, which is characterized in that by below according to the original of parts by weight 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, aliphatic ester 2.1 Part, 2.6 parts of pentaerythrite, 1.5 parts of ultraviolet absorbing agent.
4. high-strength polyolefin heat shrink films according to claim 3, which is characterized in that the ultraviolet absorbing agent is purple Ultraviolet absorbers UV-531.
CN201611145101.3A 2016-12-13 2016-12-13 A kind of high-strength polyolefin heat shrink films and its production technology Active CN106496764B (en)

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