CN107415270B - A kind of preparation method of ultrahigh molecular weight polyethylene abrasion-proof film - Google Patents
A kind of preparation method of ultrahigh molecular weight polyethylene abrasion-proof film Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
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- B29C48/001—Combinations of extrusion moulding with other shaping operations
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- C08J5/18—Manufacture of films or sheets
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- 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
- C08L23/06—Polyethene
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- B29C2948/00—Indexing scheme relating to extrusion moulding
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- B29C2948/92504—Controlled parameter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
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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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92923—Calibration, after-treatment or cooling zone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
- B29K2023/0658—PE, i.e. polyethylene characterised by its molecular weight
- B29K2023/0683—UHMWPE, i.e. ultra high molecular weight polyethylene
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29L2007/00—Flat articles, e.g. films or sheets
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- 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
- C08J2323/06—Polyethene
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- C08L2203/16—Applications used for films
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/068—Ultra high molecular weight polyethylene
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Abstract
The invention discloses a kind of preparation methods of ultrahigh molecular weight polyethylene abrasion-proof film, include the following steps: S1. pre-mixing step: ultra-high molecular weight polyethylene, solvent and additive that average weight-average molecular weight is 3,000,000 or more being mixed and carry out predissolve；S2. the product in step S1 extrusion operation: is cooled to gel film through chill roll after double screw extruder squeezes out；S3. gel film obtained in step S2 stretching process: is drawn into drawing sheet through biaxial orientation stretching machine；S4. extraction process: microporous membrane is obtained with the solvent in extractant removal drawing sheet；S5. drying process: the extractant on removal microporous membrane surface；S6. closed pore process: microporous membrane dry obtained in step S5, which is carried out heat treatment, makes micropore closed pore on film.The invention has the advantages that: the preparation methods for applying for described according to the present invention can prepare uniform, ultra-thin, the big wide cut of thickness, can quantity-produced ultrahigh molecular weight polyethylene abrasion-proof film.
Description
Technical field
The present invention relates to polyethylene film manufacturing technology fields, it particularly relates to which a kind of ultra-high molecular weight polyethylene is resistance to
The preparation method of wear down film.
Background technique
Ultra-high molecular weight polyethylene refers to straight linear polyethylene of the average molecular weight 3,000,000 or more, at present superelevation in the world
The highest average molecule amount of molecular weight polyethylene is 12,000,000.Since ultra-high molecular weight polyethylene has high molecular weight, amount
Change causes qualitative change, performance and common low density polyethylene (LDPE) and high density polyethylene (HDPE) a great difference, and special property is presented
Can, most outstanding is exactly that ultra-high molecular weight polyethylene has fabulous wearability, under specific abrasive conditions, super high molecular weight
The wearability of polyethylene is 2 times of steel.In addition ultra-high molecular weight polyethylene also has the impact all higher than all engineering plastics strong
Degree, brilliant resistance to ultralow temperature characteristics and self-lubrication.
Since ultra-high molecular weight polyethylene has some special excellent performances, so it has wide range of applications.Utilize it
Fabulous antiwear characteristic and low density characteristic, ultra-high molecular weight polyethylene are widely used in wear resistance lining under the conditions of certain,
Liner plate, instead of metal material, to mould Dai Gang, such as coal bunker liner plate, guide rail on package packing machine, conducting bar etc..Super high molecular weight is poly-
Ethylene wear-resistance thin film equally has the characteristic of ultra-high molecular weight polyethylene, but since its thickness is thin, malleable shape is being worn
Little environmental condition is measured, ultra-high molecular weight polyethylene can be replaced to be molded wearable plate, and convenient for construction, is substantially reduced into
This.
Domestic patent CN202498672 U and CN202498745 U discloses that prepare ultrahigh molecular weight polyethylene abrasion-proof thin
The technology and equipment that film uses is: ultra-high molecular weight polyethylene powder being placed in mold, mould under conditions of heating pressurization
It is pressed into the ultra-high molecular weight polyethylene molding cylindrical body of certain altitude and diameter or the super high molecular weight of certain length and wall thickness
Polyvinyl piping materials, then by molding cylindrical body, perhaps tubing is placed in cylindrical body or tubing on cutter with cutter along perimeter
Direction cuts into certain thickness wear-resistance thin film, and wear-resistance thin film is then carried out internal stress heat treatment.The advantages of this method is
Processing cost is low, and equipment investment is small, and the ultrahigh molecular weight polyethylene abrasion-proof film of any molecular weight can be processed, but also has by mould
The limitation of productive prospecting is pressed, the breadth of the wear-resistance thin film of cutting is smaller, it is limited by machine cut equipment, wear-resistance thin film
It is in uneven thickness, it is not capable of processing thickness less than 20 microns of wear-resistance thin films once, the disadvantages such as production efficiency is low.Domestic patent
CN103724758A discloses the preparation method and device of another ultra-high molecular weight polyethylene film: using melting extrusion
Modified ultra-high molecular weight polyethylene is extruded into sheet material by technique, then in biaxial tension or simple tension at film, this side
The ultra-high molecular weight polyethylene film that method the obtains although bigger film of available breadth, but due to necessary in its raw material
The a large amount of additive for improving Flow Properties of Uhmwpe of incorporation, certainly will damage the property of ultra-high molecular weight polyethylene significantly
Can, in addition there is also obtained film gauge uniformity is poor for this dry process, it is difficult to prepare ultra-thin film, in addition control is drawn
Extend through journey occur film breaks requirement it is also high.
For the problems in the relevant technologies, currently no effective solution has been proposed.
Summary of the invention
For above-mentioned technical problem in the related technology, the present invention proposes the pure ultra-high molecular that a kind of thickness is uniform, ultra-thin
Weight northylen wear-resistance thin film and preparation method thereof, preparation method described in the present patent application be suitable for it is continuous, produce in large quantities, process
Thickness can achieve 20 microns hereinafter, and the performance of ultra-high molecular weight polyethylene will not be damaged, obtained film wear-resisting property is good
It is good.
To realize the above-mentioned technical purpose, the technical scheme of the present invention is realized as follows:
A kind of preparation method of ultrahigh molecular weight polyethylene abrasion-proof film, includes the following steps:
S1. pre-mixing step: by average weight-average molecular weight be 3,000,000 or more ultra-high molecular weight polyethylene, solvent and
Additive is mixed and carries out predissolve；
S2. the product in step S1 extrusion operation: is cooled to gel film through chill roll after double screw extruder squeezes out；
S3. gel film obtained in step S2 stretching process: is drawn into drawing sheet through biaxial orientation stretching machine；
S4. extraction process: microporous membrane is obtained with the solvent in extractant removal drawing sheet；
S5. drying process: the extractant on removal microporous membrane surface；
S6. closed pore process: microporous membrane dry obtained in step S5, which is carried out heat treatment, closes the micropore on film
Hole.
Further, the temperature being heat-treated in the step S6 is 135 DEG C or more, and the processing time is greater than 1 minute.
Further, by weight calculating, ultra-high molecular weight polyethylene is 10 ~ 30% in the step S1, the additive
It is 0.02 ~ 0.06%, surplus is solvent.
Further, the solvent is nonvolatile solvent.
Further, the barrel heat temperature setting of double screw extruder is described cold at 150 ~ 230 DEG C in the step S2
But the temperature setting of roller is at 20 ~ 50 DEG C.
Further, in the step S3 gel film in 100 ~ 140 DEG C of progress biaxial tensiones.
Further, the extractant in the step S4 be can be carried out at normal temperature with the solvent miscible hydro carbons or
Halogenated hydrocarbons.
Further, the drying process carries out under the conditions of heat blowing, and the heating temperature is arranged in the extraction
It is more than the boiling point of agent.
Further, the thickness of the polyethylene wearproof film is at 20 μm or less.
The invention has the advantages that: preparation process of the present invention to traditional ultrahigh molecular weight polyethylene abrasion-proof film to carry out
Improve, apply for that the preparation method can prepare uniform, ultra-thin, the big wide cut of thickness according to the present invention, can quantity-produced it is super
High molecular weight polyethylene wear-resistance thin film.
Detailed description of the invention
Fig. 1 is a kind of technique of the preparation method of ultrahigh molecular weight polyethylene abrasion-proof film according to inventive embodiments
Flow chart.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, following embodiment for explaining only the invention, are not used in the limitation present invention, the various former materials mentioned in embodiment
Material, reagent and machinery are commercially obtained without specified otherwise.
The average Weight-average molecular of the raw material ultra-high molecular weight polyethylene of ultrahigh molecular weight polyethylene abrasion-proof film of the invention
Amount at least wants 3,000,000, and (according to ISO 1628-3, measurement the 3rd of plastics viscosity number and Limiting Viscosity is to ultra-high molecular weight polyethylene
Definition) more than, there is no limit but actual production is set in 7,000,000 hereinafter, flat in the upper-bound theory of average weight-average molecular weight
Equal weight average molecular weight is too big, and the Viscosity of Polymer Solutions of formation is too big, it is not easy to squeeze out from double screw extruder.
As shown in Figure 1, the manufacturing method each process to ultrahigh molecular weight polyethylene abrasion-proof film is described in detail below.
A kind of preparation method of ultrahigh molecular weight polyethylene abrasion-proof film, includes the following steps:
S1. pre-mixing step: being that 3,000,000 (according to ISO 1628-3, plastics viscosity number and the limit are viscous by average weight-average molecular weight
Several measurements the 3rd definition to ultra-high molecular weight polyethylene) more than ultra-high molecular weight polyethylene, solvent and additive into
Row mixes and carries out predissolve；
S2. the product in step S1 extrusion operation: is cooled to gel film through chill roll after double screw extruder squeezes out；
S3. gel film obtained in step S2 stretching process: is drawn into drawing sheet through biaxial orientation stretching machine；
S4. extraction process: microporous membrane is obtained with the solvent in extractant removal drawing sheet；
S5. drying process: the extractant on removal microporous membrane surface；
S6. closed pore process: microporous membrane dry obtained in step S5, which is carried out heat treatment, closes the micropore on film
Hole.
In step S1, all solvents that can sufficiently dissolve ultra-high molecular weight polyethylene can be used, and not limited especially
System, such as: heptane, nonane, hendecane, dodecane, the aliphatic hydrocarbons such as decahydronaphthalene or cycloalkane or boiling point are corresponding with above-mentioned solvent
Mineral oil fractions, wherein nonvolatile solvent as white oil (such as No. 50 white oils) has safety good, the gel of formation
The advantages that solvent content is stablized, is therefore preferred solvent.
The proportion of solvent and ultra-high molecular weight polyethylene should be according to the average weight-average molecular weight of ultra-high molecular weight polyethylene
Different corresponding adjustment, if being 100% according to the total weight of ultra-high molecular weight polyethylene, additive and solvent, supra polymer
The content (weight) of weight northylen should be controlled 10 ~ 30%, and solvent content is excessively high, and the intensity for obtaining gel film is not enough and unstable
Fixed, the too high levels of ultra-high molecular weight polyethylene, dissolution is difficult, and the viscosity of Polymer Solution is big, so that twin-screw extrusion is difficult.
It is lower that the small ultra-high molecular weight polyethylene of average weight-average molecular weight can choose solvent content, on the contrary, the Weight-average molecular that is averaged
Measuring big ultra-high molecular weight polyethylene, to can choose solvent content higher.
Ultra-high molecular weight polyethylene is easy to oxidize at high temperature due to straight chain long chain, in order to prevent super high molecular weight
Polyethylene is oxidized chain rupture in process, it is necessary to add antioxidant, experiment shows Hinered phenols antioxidant in superelevation
Molecular weight polyethylene wear-resistance thin film prepares a possibility that each process exudation very little, therefore is preferred antioxidant, such as: antioxidant
1010, antioxidant 1076, antioxidant 1098, preferably antioxidant 1010.The additive amount 0.02 ~ 0.06% of antioxidant, preferably 0.04%.
The specific operation method is as follows by step S1: being first dissolved in antioxidant in 25 ~ 30 DEG C of solvent, then proportionally adds
Enter ultra-high molecular weight polyethylene and be distributed in predissolve and dispersion tank, mixture is pumped by twin-screw by measurement gear pump and is squeezed
The feed inlet of machine out.
In step S2, double screw extruder is the place that super high molecular polyethylene solution sufficiently dissolves and disperses, due to
Super high molecular weight is straight chain long-chain, to shear-sensitive, therefore it is required that the threaded block combination of double screw extruder is high dispersive and low
The combination of shearing, and double screw extruder be long enough that ultra-high molecular weight polyethylene can have time enough in machine barrel
Dissolution, the draw ratio of double screw extruder (draw ratio of double screw extruder refers to the ratio between effective length and outer screw diameter of screw rod)
45 ~ 55, preferably draw ratio is 50.Double screw extruder barrel heat temperature is set in 150 ~ 230 DEG C, and preferably setting temperature is
180℃。
Super high molecular polyethylene solution is squeezed out through double screw extruder, is in melt state, is extruded by extrusion die
Gel sheet, extrusion die is the sheet die for the rectangle Oral incision that bilateral symmetry is distributed in mold heating zone, so that squeezing
The thickness of gel sheet out is at 0.5 ~ 4.5 millimeter, and the temperature setting of mold heating zone is at 150 ~ 240 DEG C.
The cooling of gel film squeezed out from mold carries out on chill roll, the temperature setting range of chill roll at 20 ~ 50 DEG C,
So that the cooling velocity of gel film is at 50 DEG C/min or more.40 ~ 60 centimetres of breadth are obtained after chill roll is cooling, thickness exists
0.5 ~ 2 millimeter of gel film.
In step S3, obtained gel film is drawn into the drawing sheet that face multiple is 5 times or more, face by biaxial orientation stretching machine
The selection of multiple depends on the thickness of the film finally obtained, also determines horizontal and vertical draw ratio.Gel film is existed
Biaxial tension is carried out under heated condition, the temperature of heating zone is set in 100 ~ 140 DEG C.Obtained after biaxial tension thickness 30 ~
80 microns of drawing sheet.
In step S4, it will be immersed in extraction tank under drawing sheet room temperature, solvent therein removed.Extraction tank can by multiple groups
With the roller group that interlocks with the rotation at drawing sheet is wound in rotating roller and is back and forth immersed in extractant, until the solvent in drawing sheet is low
In 1%.Extractant can choose hydro carbons and halogenated hydrocarbons that can be miscible with room temperature and solvent, such as heptane, hexane, methylene chloride, and three
Chloromethanes and carbon tetrachloride etc..
In step S5, by the dry evaporation of the micropore wear-resistance thin film being obtained by extraction extractant remained on surface.Drying process exists
It is carried out under the conditions of heat blowing, the boiling point of the extractant or more is arranged in the heating temperature, in this way in micropore wear-resistance thin film
On extractant residual quantity will be greatly reduced.
In step S6, by the ultrahigh molecular weight polyethylene abrasion-proof film after drying at 140 ~ 200 DEG C of temperature, heat treatment time
The micropore on film is subjected to closed pore heat treatment under conditions of 1 minute or more so that film become one it is continuous whole wear-resisting
Film finally obtains 20 microns of wear-resistance thin films below of thickness.Since the fusing point of ultra-high molecular weight polyethylene is 135 DEG C, closed pore
Heat treatment should carry out more than its fusing point.The ultrahigh molecular weight polyethylene abrasion-proof film wear-resisting property obtained through closed pore process will
There is further promotion.
It will be illustrated below by specific embodiment technical solution described in the present patent application.
Firstly, for the ultrahigh molecular weight polyethylene abrasion-proof film for taking Wet technique to prepare, last closed pore is heat-treated work
Sequence is critically important, therefore, to assure that all micropores complete closed pore under heat treatment can be characterized with air permeability and porosity.
Porosity measurement method is as follows: the square-like of certain length is cut from ultrahigh molecular weight polyethylene abrasion-proof film
This, measures sample volume (cm3) and weight (g), it is calculated according to the following formula: porosity (%)=(1- sample weight/(supra polymer
Weight northylen density × sample volume)) × 100.
Air permeability can be detected by permeating degree tester.
Embodiment one:
0.04% antioxidant (deriving from Ciba Irganox1010, obtain through commercial sources) is added the 80 of 25 DEG C
The 50# white oil (deriving from Hangzhou Refinery, obtain through commercial sources) of parts by weight, dispersing and dissolving is complete, and 20 weight are then added
The ultra-high molecular weight polyethylene (deriving from DSM Stamylan UH034, obtain through commercial sources) of part, average weight-average molecular weight
For 3,280,000, (according to ISO 1628-3, measurement the 3rd of plastics viscosity number and Limiting Viscosity determines ultra-high molecular weight polyethylene
Justice), dispersion stirs evenly predissolve 60 minutes.The mixed liquor of predissolve is squeezed into double screw extruder by measurement gear pump
Feed opening, the draw ratio of double screw extruder are 50:1, and revolving speed is 100rmp, and the temperature of each heating zone of double screw extruder is set
180 DEG C are set to, the gel sheet squeezed out by the sheet die of rectangle Oral incision is 50 DEG C, 25 DEG C and 25 DEG C in temperature
Thickness 1.35mm, the gel film of wide 50cm are formed under the cooling of three groups of chill rolls.The gel film biaxial orientation stretching machine is being heated
At 116 DEG C of temperature, cross directional stretch ratio is 5 times, and longitudinal stretching ratio is that biaxial tension is carried out under conditions of 4 times, forms breadth
200cm, the drawing sheet that 50 μm of thickness.The extraction tank that drawing sheet is passed sequentially through to up-down rollers is extractant using methylene chloride,
The white oil in drawing sheet is removed by extraction tank in 3 minutes at normal temperature, forms the film with micropore.By the film with micropore
It is 50 DEG C of the drying room with air blast by a temperature, by extractant evaporation drying remaining on film.By dry with micro-
The film in hole is 145 DEG C by a temperature, and between having the closed pore of multiple groups rotating roller to be heat-treated, microporous membrane is heat-treated by closed pore
Between time be 10 minutes.Wear-resistance thin film rolling after cooling packaging by closed pore heat treatment.The physical property of obtained wear-resistance thin film
The wear-resistance thin film 1 of test result such as table 1.
Embodiment two:
0.04% antioxidant (deriving from Ciba Irganox1010, obtain through commercial sources) is added the 85 of 30 DEG C
The 50# white oil (deriving from Hangzhou Refinery, obtain through commercial sources) of parts by weight, dispersing and dissolving is complete, and 15 weight are then added
The ultra-high molecular weight polyethylene (deriving from Celanese GUR4022, obtain through commercial sources) of part, average weight-average molecular weight 525
Ten thousand (according to ISO 1628-3, measurement the 3rd definition to ultra-high molecular weight polyethylene of plastics viscosity number and Limiting Viscosity), dispersion
Stir evenly predissolve 90 minutes.The mixed liquor of predissolve is squeezed into the feed opening of double screw extruder by measurement gear pump,
The draw ratio of double screw extruder is 50:1, and revolving speed is 100rmp, and the temperature setting of each heating zone of double screw extruder is 185
DEG C, the gel sheet squeezed out by the sheet die of rectangle Oral incision is three groups of 50 DEG C, 25 DEG C and 25 DEG C cold in temperature
But thickness 1.35mm, the gel film of wide 50cm are formed under the cooling of roller.The gel film biaxial orientation stretching machine is existed in heating temperature
At 118 DEG C, cross directional stretch ratio is 5 times, and longitudinal stretching ratio is that biaxial tension is carried out under the conditions of 4 times, forms breadth 200cm, thickness
50 μm of drawing sheet.The extraction tank that drawing sheet is passed sequentially through to up-down rollers is extractant using methylene chloride, at normal temperature 3
By extraction tank in minute, remove the white oil in drawing sheet, forms the film with micropore.Film with micropore is passed through into a temperature
Degree is 50 DEG C of the drying room with air blast, by extractant evaporation drying remaining on film.By the dry film warp with micropore
Crossing a temperature is 145 DEG C, and between having the closed pore of multiple groups rotating roller to be heat-treated, microporous membrane is by the time between closed pore is heat-treated
10 minutes.Wear-resistance thin film rolling after cooling packaging by closed pore heat treatment.The physical property measurement result of obtained wear-resistance thin film is such as
The wear-resistance thin film 2 of table 1.
Embodiment three:
0.04% antioxidant (deriving from Ciba Irganox1010, obtain through commercial sources) is added the 88 of 30 DEG C
The 50# white oil (deriving from Hangzhou Refinery, obtain through commercial sources) of parts by weight, dispersing and dissolving is complete, and 12 weight are then added
The ultra-high molecular weight polyethylene (deriving from Braskem UTEC_5040, obtain through commercial sources) of part, average weight-average molecular weight
6000000 (according to ISO 1628-3, measurement the 3rd definition to ultra-high molecular weight polyethylene of plastics viscosity number and Limiting Viscosity),
Dispersion stirs evenly predissolve 90 minutes.The mixed liquor of predissolve is squeezed into the charging of double screw extruder by measurement gear pump
Mouthful, the draw ratio of double screw extruder is 50:1, and revolving speed is 100rmp, and the temperature setting of each heating zone of double screw extruder is
190 DEG C, be three groups of 50 DEG C, 25 DEG C and 25 DEG C in temperature by the gel sheet that the sheet die of rectangle Oral incision squeezes out
Thickness 1.35mm, the gel film of wide 50cm are formed under the cooling of chill roll.By the gel film biaxial orientation stretching machine in heating temperature
At 120 DEG C, cross directional stretch ratio is 5 times, and longitudinal stretching ratio is that biaxial tension is carried out under the conditions of 4 times, forms breadth 200cm, thick
The drawing sheet of 50 μm of degree.The extraction tank that drawing sheet is passed sequentially through to up-down rollers is extractant using methylene chloride, at normal temperature
By extraction tank in 3 minutes, remove the white oil in drawing sheet, forms the film with micropore.Film with micropore is passed through one
Temperature is 50 DEG C of the drying room with air blast, by extractant evaporation drying remaining on film.By the dry film with micropore
It is 145 DEG C by a temperature, between having the closed pore of multiple groups rotating roller to be heat-treated, microporous membrane passes through the time between closed pore heat treatment
It is 10 minutes.Wear-resistance thin film rolling after cooling packaging by closed pore heat treatment.The physical property measurement result of obtained wear-resistance thin film
Such as the wear-resistance thin film 3 of table 1.
Example IV:
The difference is that only micropore of ultrahigh molecular weight polyethylene abrasion-proof film prepared with the method for embodiment one is thin
Film is 130 DEG C in the temperature that closed pore is heat-treated, and obtains the ultrahigh molecular weight polyethylene abrasion-proof film 4 in table 1.
Embodiment five:
The difference is that only micropore of ultrahigh molecular weight polyethylene abrasion-proof film prepared with the method for embodiment one is thin
Film is 135 DEG C in the temperature that closed pore is heat-treated, and obtains the ultrahigh molecular weight polyethylene abrasion-proof film 5 in table 1.
Embodiment six
The difference is that only micropore of ultrahigh molecular weight polyethylene abrasion-proof film prepared with the method for embodiment one is thin
Film is 140 DEG C in the temperature that closed pore is heat-treated, and obtains the ultrahigh molecular weight polyethylene abrasion-proof film 6 in table 1.
It can clearly be obtained by table 1 and need to make the temperature of heat treatment can guarantee in closed pore process at 135 DEG C or more
Full closed pore.
1. ultrahigh molecular weight polyethylene abrasion-proof film 1-6 of table measures parameter
| 1 | 2 | 3 | 4 | 5 | 6 | |
| Film thickness (μm) | 20 | 16 | 12 | 19 | 20 | 20 |
| Porosity (%) | 0 | 0 | 0 | 40 | 5 | 0 |
| Air permeability (s) | It is airtight | It is airtight | It is airtight | 300 | 2800 | It is airtight |
Claims (2)
1. a kind of preparation method of ultrahigh molecular weight polyethylene abrasion-proof film, which comprises the steps of: by 0.04%
Antioxidant be added 30 DEG C 85 parts by weight 50# white oil, dispersing and dissolving is complete, and the super high molecular weight of 15 parts by weight is then added
Polyethylene, average weight-average molecular weight 5,250,000, dispersion stir evenly predissolve 90 minutes, the mixed liquor of predissolve are passed through metering
Gear pump squeezes into the feed opening of double screw extruder, and the draw ratio of double screw extruder is 50:1, and revolving speed is 100rmp, twin-screw
The temperature setting of each heating zone of extruder is 185 DEG C, the gel sheet squeezed out by the sheet die of rectangle Oral incision
Thickness 1.35mm, the gel film of wide 50cm, by this are formed in the case where temperature is the cooling of 50 DEG C, 25 DEG C and 25 DEG C of three groups of chill rolls
For gel film biaxial orientation stretching machine in heating temperature at 118 DEG C, cross directional stretch ratio is 5 times, longitudinal stretching ratio be under the conditions of 4 times into
Row biaxial tension, forms breadth 200cm, and drawing sheet is passed sequentially through the extraction tank of up-down rollers, made by the drawing sheet that 50 μm of thickness
It is extractant with methylene chloride, the white oil in drawing sheet is removed by extraction tank in 3 minutes at normal temperature, is formed with micropore
Film with micropore is passed through the drying room with air blast that a temperature is 50 DEG C, extractant remaining on film is steamed by film
Dry dry, it is 145 DEG C that the dry film with micropore, which is passed through a temperature, micro- between having the closed pore of multiple groups rotating roller to be heat-treated
Hole film is 10 minutes by the time between closed pore heat treatment, and the wear-resistance thin film rolling after cooling by closed pore heat treatment is packed,
Obtain wear-resistance thin film.
2. a kind of preparation method of ultrahigh molecular weight polyethylene abrasion-proof film according to claim 1, which is characterized in that institute
The thickness of polyethylene wearproof film is stated at 20 μm or less.
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| WO1993012920A1 (en) * | 1991-12-27 | 1993-07-08 | Mitsui Petrochemical Industries, Ltd. | Biaxially oriented high-molecular polyethylene film and production thereof, and surface-modified, biaxially oriented high-molecular polyethylene film and production thereof |
| EP0896793A1 (en) * | 1997-08-12 | 1999-02-17 | Viskase Corporation | Method of making a cellulose food casing including solvent recovery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993012920A1 (en) * | 1991-12-27 | 1993-07-08 | Mitsui Petrochemical Industries, Ltd. | Biaxially oriented high-molecular polyethylene film and production thereof, and surface-modified, biaxially oriented high-molecular polyethylene film and production thereof |
| EP0896793A1 (en) * | 1997-08-12 | 1999-02-17 | Viskase Corporation | Method of making a cellulose food casing including solvent recovery |
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