CN117779355B - Flash spinning membrane material and manufacturing method thereof - Google Patents
Flash spinning membrane material and manufacturing method thereof Download PDFInfo
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- CN117779355B CN117779355B CN202410217760.1A CN202410217760A CN117779355B CN 117779355 B CN117779355 B CN 117779355B CN 202410217760 A CN202410217760 A CN 202410217760A CN 117779355 B CN117779355 B CN 117779355B
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- 238000009987 spinning Methods 0.000 title claims abstract description 67
- 239000000463 material Substances 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000012528 membrane Substances 0.000 title description 6
- 238000004049 embossing Methods 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 239000004698 Polyethylene Substances 0.000 claims abstract description 22
- -1 polyethylene Polymers 0.000 claims abstract description 22
- 229920000573 polyethylene Polymers 0.000 claims abstract description 22
- 239000002904 solvent Substances 0.000 claims abstract description 17
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical group ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229920000642 polymer Polymers 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 6
- 238000007731 hot pressing Methods 0.000 claims abstract description 6
- 239000004751 flashspun nonwoven Substances 0.000 claims description 41
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 33
- 238000002156 mixing Methods 0.000 claims description 20
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 claims description 14
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims description 13
- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 claims description 12
- SBASXUCJHJRPEV-UHFFFAOYSA-N 2-(2-methoxyethoxy)ethanol Chemical compound COCCOCCO SBASXUCJHJRPEV-UHFFFAOYSA-N 0.000 claims description 11
- 229920002907 Guar gum Polymers 0.000 claims description 11
- 239000008367 deionised water Substances 0.000 claims description 11
- 229910021641 deionized water Inorganic materials 0.000 claims description 11
- AMTWCFIAVKBGOD-UHFFFAOYSA-N dioxosilane;methoxy-dimethyl-trimethylsilyloxysilane Chemical compound O=[Si]=O.CO[Si](C)(C)O[Si](C)(C)C AMTWCFIAVKBGOD-UHFFFAOYSA-N 0.000 claims description 11
- 229960002154 guar gum Drugs 0.000 claims description 11
- 235000010417 guar gum Nutrition 0.000 claims description 11
- 239000000665 guar gum Substances 0.000 claims description 11
- 229940083037 simethicone Drugs 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000003607 modifier Substances 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 229940116224 behenate Drugs 0.000 claims description 7
- UKMSUNONTOPOIO-UHFFFAOYSA-M behenate Chemical compound CCCCCCCCCCCCCCCCCCCCCC([O-])=O UKMSUNONTOPOIO-UHFFFAOYSA-M 0.000 claims description 7
- 235000021357 Behenic acid Nutrition 0.000 claims description 6
- 229940116226 behenic acid Drugs 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 description 14
- 230000003746 surface roughness Effects 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 9
- 238000005259 measurement Methods 0.000 description 9
- 239000000835 fiber Substances 0.000 description 8
- 238000011056 performance test Methods 0.000 description 7
- 229920001474 Flashspun fabric Polymers 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 238000003672 processing method Methods 0.000 description 4
- 239000005662 Paraffin oil Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000000578 dry spinning Methods 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010960 commercial process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- AGDANEVFLMAYGL-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O.CCCCCCCCCCCCCCCCCCCCCC(O)=O AGDANEVFLMAYGL-UHFFFAOYSA-N 0.000 description 1
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000012456 homogeneous solution Substances 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000004557 technical material Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The application relates to a flash spinning film material and a manufacturing method thereof, comprising the following steps: (1) A spinning step in which a spinning solution is discharged from a nozzle at high temperature and high pressure, a solvent in the spinning solution is evaporated, and a polymer solute in the spinning solution is cooled and solidified into a continuous filament bundle, wherein the spinning solution contains polyethylene, a toughness improver and a spinning solvent, and the spinning solvent is chloroform; (2) A lapping process in which continuous filament bundles are evenly laid on a lapping unit on a conveyor belt that runs under the condition of blowing by a blower; (3) And forming, wherein the web forming area is conveyed to an embossing roller through a conveyor belt for hot pressing to obtain the polyethylene flash spinning film, the conveying speed of the conveyor belt is 5 cm/s-20 cm/s, the linear pressure of the embossing roller is 100-550N/cm, and the heating temperature of the embossing roller is 60-110 ℃.
Description
Technical Field
The invention relates to the technical field of flash evaporation, in particular to a flash spinning membrane material and a manufacturing method thereof.
Background
Flash spinning (also known as solution flash spinning) refers to a spinning process in which a high polymer solution is extruded at a high pressure above its solvent boiling point, and solvent flash causes the polymer to cool and solidify to form fibers. Flash spinning requires that the polymer and solvent do not decompose above the boiling point of the solvent, which is easily evaporated. The extruded solution trickles, causing the solvent to flash off when the pressure suddenly drops, solidifying the polymer into fibers. The most prominent technical characteristics of flash spinning are: phase separation, such as the conversion of polymer and solvent to a homogeneous solution during dissolution with stirring at high temperature and pressure; in the low-pressure chamber, slightly reducing the pressure of the solution to enable the solution to undergo phase separation to a certain extent to form a two-liquid-phase solution, wherein the first phase is a polymer-rich phase, and the second phase is a solvent-rich phase; finally, when the solution enters the air at normal temperature and normal pressure through the spinneret holes, the solvent is converted into steam to be rapidly separated from the polymer.
However, the conventional flash-evaporated sheet has a problem that if the toughness of the flash-spun film is insufficient or the hardness is too high, the flash-spun film is easily broken during the embossing treatment, and the flash-spun film is sometimes not broken, but after the embossing treatment, the tensile strength, the breaking strength and the surface strength of the flash-spun film are significantly reduced, and the flash-spun film is not suitable for the corresponding application. The application improves toughness by adding behenate, erucamide and paraffin oil into spinning solution, and solves the technical problems of reduced tensile strength, breaking strength and surface strength by controlling transmission speed in an embossing process, line pressure of an embossing roller, heating temperature of the embossing roller and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a processing method of a flash-spun sheet.
The aim of the invention is realized by the following technical scheme:
in a first aspect, the present invention provides a method for manufacturing a flash spun film material, comprising the steps of:
(1) A spinning step in which a spinning solution is discharged from a nozzle at high temperature and high pressure, a solvent in the spinning solution is evaporated, and a polymer solute in the spinning solution is cooled and solidified into a continuous filament bundle, wherein the spinning solution contains polyethylene, a toughness improver and a spinning solvent, and the spinning solvent is chloroform;
The toughness improver comprises the following components in parts by weight: 2-6 parts of simethicone, 1-5 parts of behenic acid behenester, 1-5 parts of erucamide, 0.2-0.6 part of guar gum, 0.3-0.7 part of acetic acid, 1-5 parts of diethylene glycol monomethyl ether and 60 parts of deionized water;
The toughness modifier is prepared by mixing ① deionized water, acetic acid and guar gum, heating to 45 ℃, and standing for later use; ② Mixing simethicone, behenate and erucamide, heating to 45 ℃, mixing with the product obtained in the step ①, stirring for 30 minutes, and standing for 30 minutes; ③ And cooling the product obtained in the step ② to 35 ℃, mixing with diethylene glycol monomethyl ether, and stirring for 20 minutes to obtain the toughness improver.
(2) And a lapping process in which the continuous filament bundles are uniformly laid on a lapping unit on a conveyor belt that is running under the condition of blowing by a blower.
(3) A forming process, wherein the web forming area is conveyed to an embossing roller through a conveying belt for hot pressing to obtain a polyethylene flash spinning film material, the conveying speed of the conveying belt is 5 cm/s to 20 cm/s, preferably 10 cm/s to 20 cm/s, more preferably 10 cm/s, 15 cm/s and 20 cm/s, the linear pressure of the embossing roller is 100 to 550N/cm, preferably 300 to 550N/cm, more preferably 100N/cm, 300N/cm and 550N/cm, the heating temperature of the embossing roller is 60 to 110 ℃, preferably 90 to 110 ℃, more preferably 90 ℃ and 100 ℃ and 110 ℃;
The embossing roller is formed by a convex roller and a concave roller, a plurality of convex parts are arranged on the peripheral surface of the convex roller, a plurality of concave parts are arranged on the peripheral surface of the concave roller, the convex parts are meshed with the concave parts, the convex parts are uniformly arranged in the rotating shaft direction and the circumferential direction of the convex roller, and the concave parts are uniformly arranged in the rotating shaft direction and the circumferential direction of the concave roller.
In a preferred embodiment, the content of the toughness improver is 0.10 to 0.50 parts by mass relative to 100 parts by mass of the spinning solution.
In a preferred embodiment, the toughness modifier comprises the following components in parts by weight: 4 parts of simethicone, 3 parts of behenic acid, 3 parts of erucamide, 0.4 part of guar gum, 0.5 part of acetic acid, 3 parts of diethylene glycol monomethyl ether and 60 parts of deionized water.
In a preferred embodiment, the temperature of the dope is 165℃to 240 ℃.
In a preferred embodiment, the height from the peripheral surface of the convex roller to the apex of the convex portion is 3 to 6mm, preferably 4 to 6mm, more preferably 3mm, 4mm, 5mm, 6mm, the distance between adjacent convex portions in the rotation axis direction, that is, the pitch is 0.5 to 10mm, preferably 4 to 6mm, more preferably 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, and the distance between adjacent convex portions in the circumferential direction, that is, the pitch is 0.5 to 10mm, preferably 4 to 6mm, more preferably 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm.
In a preferred embodiment, the top surface of the protrusion has a shape of a circle, a polygon, an ellipse.
In a preferred embodiment, the depth of engagement between the convex portion and the concave portion is 1 to 5mm, preferably 1 to 3mm, more preferably 1mm, 2mm, 3mm.
In a preferred embodiment, the number of the convex rollers is more than one, and the number of the concave rollers is more than one.
In a preferred embodiment, the polyethylene flash-spun film has a thickness of 0.1mm to 0.3mm.
In a preferred embodiment, the polyethylene flash-spun film has a weight per unit area of greater than 60g/m 2, preferably 65 to 75g/m 2, more preferably 75 to 85g/m 2.
In a second aspect, the present invention provides a flash-spun film produced by the method for producing a flash-spun film according to any one of the above.
Compared with the prior art, the invention has the following positive effects: according to the invention, the behenic acid behenate, the erucic acid amide and the paraffin oil serving as the softener are added into the spinning solution to improve toughness, the transmission speed in an embossing process is controlled, the line pressure of the embossing roller, the heating temperature of the embossing roller and the like are controlled, so that the damage of the flash spinning film material in the embossing process can be reduced, the reduction of the tensile strength, the breaking strength and the surface strength caused by the embossing process can be reduced, and finally the flash spinning film material with excellent flexibility, the tensile strength, the breaking strength and the surface strength is obtained.
Detailed Description
I. Definition of the definition
In the present invention, unless otherwise indicated, scientific and technical terms used herein have the meanings commonly understood by one of ordinary skill in the art. Also, the relative terms and laboratory procedures used herein are terms and conventional procedures that are widely used in the corresponding arts. Meanwhile, in order to better understand the present invention, definitions and explanations of related terms are provided below.
As used herein and unless otherwise indicated, the term "about" or "approximately" means within plus or minus 10% of a given value or range. Where integers are required, the term refers to rounding up or down to the nearest integer within plus or minus 10% of a given value or range.
In the description herein, reference is made to "some embodiments," "some implementations," or "some implementations," which describe a subset of all possible embodiments, but it is to be understood that "some embodiments" may be the same subset or different subsets of all possible embodiments and may be combined with one another without conflict.
As used herein and unless otherwise indicated, the terms "comprising," "including," "having," "containing," and their grammatical equivalents are generally understood to be open-ended and not to be limiting, e.g., not to exclude other, unrecited elements or steps.
The term "flash spinning" is a novel method of producing nonwoven fabrics developed by dupont in the united states in the early 90 s of the 20 th century, and is then widely used in commercial processes. The flash evaporation method adopts a dry spinning technology, and is different from the traditional dry spinning technology in that the flash evaporation technology adopts lower concentration of spinning solution, and the spinning solution is sprayed out of a spinneret orifice at extremely high pressure and speed, and because the solution has low viscosity and good fluidity, liquid silk is solidified in high-speed movement to form extremely fine fiber silk, and the extremely fine fiber silk is adsorbed on a net-forming curtain to directly form a fiber net.
The term "flash-spun sheet" refers to a paper-like technical material made from 100% high density polyethylene spun-bonded by flash evaporation. Which combines the material properties of paper, cloth and film.
Examples II
The present invention will be described in further detail below for the purpose of making the objects, technical solutions and advantages of the present invention more apparent, and the described embodiments should not be construed as limiting the present invention, and all other embodiments obtained by those skilled in the art without making any inventive effort are within the scope of the present invention.
Before describing embodiments of the present invention in further detail, the terms and terminology involved in the embodiments of the present invention will be described, and the terms and terminology involved in the embodiments of the present invention will be used in the following explanation.
The materials and equipment used in the embodiments of the present invention are all known products and are obtained by purchasing commercially available products.
The test methods of the respective evaluation indexes of the samples prepared in the present application are as follows.
(1) Determination of breaking Strength (Unit: cN)
The flash-spun film was cut into a rectangular test piece having a longitudinal direction (MD direction) of 200mm and a transverse direction (CD direction) orthogonal to the longitudinal direction of 50mm at 22℃and 65% RH. The cut measurement piece was used as a measurement sample. The measurement sample was mounted on a chuck of a tensile testing machine (for example, tensilon tensile testing machine "RTA-100" manufactured by Orientec Co., ltd.) so that the MD direction became the tensile direction. Furthermore, the space between the chucks was set to 150mm. Then, the measurement sample was stretched at a speed of 300 mm/min, and the maximum load point until the measurement sample broke was set as the breaking strength in the machine direction (MD direction). In the present application, a direction corresponding to a conveying direction of a conveyor belt is referred to as a longitudinal direction, and a direction orthogonal to the conveying direction of the conveyor belt is referred to as a transverse direction.
The flash spinning film material according to the present invention has a breaking strength of 7.0N/50mm to 30.0N/50mm, preferably 8.0N/50mm to 25.0N/50mm, more preferably 10.0N/50mm to 20.0N/50mm.
(2) Tensile Strength (Unit: cN)
The flash-spun film was cut into a width of 25mm to form a test piece, both ends of the test piece were sandwiched by chucks of a tensile tester (TENSIRONRTG. RTM. 1210 manufactured by A & D corporation), and the maximum load point at which the sheets of raw paper sheets P at the respective bonded positions were peeled off from each other was measured under conditions of a chuck pitch of 50mm and a speed of 500 mm/min. Each wet sheet was subjected to such a test 4 times, and the average tensile strength was calculated.
The flash-spun film material according to the present invention has a breaking strength of 200cN to 500cN, preferably 275cN to 450cN, and more preferably 300cN to 400cN.
(3) Surface Strength (Unit: secondary)
The test piece cut out in a width of 75mm by a length of 240mm was folded into 3 folds so that the end regions in the width direction overlap, and the measurement portion was rubbed by a vibration type rubbing fastness tester, and the number of rubbing times when damage such as fuzzing and breakage was visually confirmed on the paper surface of the test piece was measured.
The flash spun film material according to the present invention preferably has a surface roughness (Ra) of 400 or more times, preferably 400 to 800 times, more preferably 500 to 800 times, and even more preferably 700 to 800 times.
(4) Surface roughness (Ra) (unit: μm)
The surface roughness (Ra) is based on ISO 25178-2:2012 measured surface roughness. In an artificial weather chamber controlled to JIS P8111 (1998), i.e., at a room temperature of 23℃and a relative humidity of 50%, an arithmetic average roughness Ra (surface roughness, μm) of a flash-spun film cut to a square of 10cm was calculated according to ISO 25178 using a laser microscope VR-3200 manufactured by KEYENCE corporation and an equivalent thereof. As software for observation, measurement, and image analysis of laser microscope images, "VR-H1A" manufactured by KEYENCE corporation may be used. The measurement conditions were measured under conditions of a magnification of 12 times and a field area of 24mm×18 mm. The measurement magnification and the field area can be appropriately changed.
The flash spun film material of the present invention has a surface roughness (Ra) of 10.0 μm to 50.0. Mu.m, preferably 20.0 μm to 40.0. Mu.m, more preferably 30.0 μm to 40.0. Mu.m.
(5) Weight per unit area (unit: g/m 2):
The weight per unit area means "mass per unit area" measured by the method described in JIS L1913 (2010 edition), specifically, 30cm×50cm test pieces were collected at equal intervals in the width direction so as to be 3 pieces per 1m, the respective masses (g) in the standard state were measured, and the decimal point of the average value was rounded off to the first place, and the result was expressed as mass per 1m 2 (g/m 2).
The weight per unit area of the flash spun film material according to the present invention is more than 60g/m 2, preferably 65 to 75g/m 2, more preferably 75 to 85g/m 2.
Example 1
The processing method of the flash spinning membrane material comprises the following steps:
① A spinning step of dissolving polyethylene and a toughness modifier in chloroform according to the contents shown in table 1 to obtain a spinning solution, wherein the mass fraction of the polyethylene in the spinning solution is 10%; then pressurizing and heating the spinning solution, and performing flash spinning at the spinning temperature of 165 ℃ to obtain flash-spun fibers;
The toughness improver comprises the following components in parts by weight: 4 parts of simethicone, 3 parts of behenic acid, 3 parts of erucamide, 0.4 part of guar gum, 0.5 part of acetic acid, 3 parts of diethylene glycol monomethyl ether and 60 parts of deionized water.
The toughness modifier is prepared by mixing ① deionized water, acetic acid and guar gum, heating to 45 ℃, and standing for later use; ② Mixing simethicone, behenate and erucamide, heating to 45 ℃, mixing with the product obtained in the step ①, stirring for 30 minutes, and standing for 30 minutes; ③ And cooling the product obtained in the step ② to 35 ℃, mixing with diethylene glycol monomethyl ether, and stirring for 20 minutes to obtain the toughness improver.
② And a lapping process in which the continuous filament bundles are uniformly laid on a lapping unit on a conveyor belt that is running under the condition of blowing by a blower.
③ A forming process, wherein a forming unit is conveyed by a conveyor belt, the forming area is conveyed by the conveyor belt to an embossing roller for hot pressing to obtain a polyethylene flash spinning film material, the conveying speed of the conveyor belt is 5 cm/s, the linear pressure of the embossing roller is 100N/cm, and the heating temperature of the embossing roller is 90 ℃;
In the embossing roller, the height of the convex portion from the peripheral surface of the convex roller to the apex of the convex portion is preferably 3mm, the distance between the convex portions adjacent in the rotation axis direction, that is, the pitch is 0.5mm, and the distance between the convex portions adjacent in the circumferential direction, that is, the pitch is 0.5mm.
The polyethylene flash-spun film obtained as described above was subjected to performance test according to the evaluation method of each index described above, and the data of the test are shown in table 1.
Example 2
The processing method of the flash spinning membrane material comprises the following steps:
① A spinning step of dissolving polyethylene and a toughness modifier in chloroform according to the content shown in table 1 to obtain a spinning solution, wherein the mass fraction of the polyethylene in the spinning solution is 15%; then pressurizing and heating the spinning solution, and performing flash spinning at 175 ℃ to obtain flash-spun fibers;
The toughness improver comprises the following components in parts by weight: 4 parts of simethicone, 3 parts of behenic acid, 3 parts of erucamide, 0.4 part of guar gum, 0.5 part of acetic acid, 3 parts of diethylene glycol monomethyl ether and 60 parts of deionized water.
The toughness modifier is prepared by mixing ① deionized water, acetic acid and guar gum, heating to 45 ℃, and standing for later use; ② Mixing simethicone, behenate and erucamide, heating to 45 ℃, mixing with the product obtained in the step ①, stirring for 30 minutes, and standing for 30 minutes; ③ And cooling the product obtained in the step ② to 35 ℃, mixing with diethylene glycol monomethyl ether, and stirring for 20 minutes to obtain the toughness improver.
② And a lapping process in which the continuous filament bundles are uniformly laid on a lapping unit on a conveyor belt that is running under the condition of blowing by a blower.
③ A forming process, wherein a forming unit is conveyed by a conveyor belt, the forming area is conveyed by the conveyor belt to an embossing roller for hot pressing to obtain a polyethylene flash spinning film material, the conveying speed of the conveyor belt is 10 cm/s, the linear pressure of the embossing roller is 300N/cm, and the heating temperature of the embossing roller is 100 ℃;
In the embossing roller, the height of the convex parts from the peripheral surface of the convex roller to the top point of the convex parts is 5mm, the distance between the adjacent convex parts in the rotation axis direction is 3mm, and the distance between the adjacent convex parts in the circumferential direction is 3mm.
The polyethylene flash-spun film obtained as described above was subjected to performance test according to the evaluation method of each index described above, and the data of the test are shown in table 1.
Example 3
The processing method of the flash spinning membrane material comprises the following steps:
① A spinning step of dissolving polyethylene and a toughness modifier in chloroform according to the contents shown in table 1 to obtain a spinning solution, wherein the mass fraction of the polyethylene in the spinning solution is 20%; then pressurizing and heating the spinning solution, and carrying out flash spinning at 185 ℃ to obtain flash-spun fibers;
The toughness improver comprises the following components in parts by weight: 4 parts of simethicone, 3 parts of behenic acid, 3 parts of erucamide, 0.4 part of guar gum, 0.5 part of acetic acid, 3 parts of diethylene glycol monomethyl ether and 60 parts of deionized water.
The toughness modifier is prepared by mixing ① deionized water, acetic acid and guar gum, heating to 45 ℃, and standing for later use; ② Mixing simethicone, behenate and erucamide, heating to 45 ℃, mixing with the product obtained in the step ①, stirring for 30 minutes, and standing for 30 minutes; ③ And cooling the product obtained in the step ② to 35 ℃, mixing with diethylene glycol monomethyl ether, and stirring for 20 minutes to obtain the toughness improver.
② And a lapping process in which the continuous filament bundles are uniformly laid on a lapping unit on a conveyor belt that is running under the condition of blowing by a blower.
③ A forming process, wherein a forming unit is conveyed by a conveyor belt, the forming area is conveyed by the conveyor belt to an embossing roller for hot pressing to obtain a polyethylene flash spinning film material, the conveying speed of the conveyor belt is 20 cm/s, the pipeline pressure of the embossing roller is 550N/cm, and the heating temperature of the embossing roller is 110 ℃;
In the embossing roller, the height from the peripheral surface of the embossing roller to the apex of the convex portion is 6mm, the distance between adjacent convex portions in the rotation axis direction is 8mm, and the distance between adjacent convex portions in the circumferential direction is 8mm.
The polyethylene flash-spun film obtained as described above was subjected to performance test according to the evaluation method of each index described above, and the data of the test are shown in table 1.
Comparative examples 1 to 3
Sheets were obtained in the same manner as in example 1 to example 3 except that the toughness modifiers in example 1 to example 3 were used. The performance test was performed as described above and the data of the test are shown in table 1.
Comparative examples 4 to 6
Sheets were obtained in the same manner as in example 1 except that the transport speeds in examples 1 to 3 were changed to 4 cm/sec or 25 cm/sec, respectively. The performance test was performed as described above and the data of the test are shown in table 1.
Comparative examples 7 to 9
Sheets were obtained in the same manner as in example 1 except that the line pressure of the embossing rolls in examples 1 to 3 was changed to 80N/cm or 600N/cm, respectively. The performance test was performed as described above and the data of the test are shown in table 1.
Comparative examples 10 to 12
Sheets were obtained in the same manner as in example 1, except that the heating temperatures of the embossing rolls in examples 1 to 3 were changed to 50 ℃ or 120 ℃, respectively. The performance test was performed as described above and the data of the test are shown in table 1.
Table 1 experimental data for examples and comparative examples
As can be seen from the above data, by using the composition of the present application and controlling the transfer speed in the embossing process, the line pressure of the embossing roll, the heating temperature of the embossing roll, etc. within the scope of the present application as shown in examples 1 to 3, the obtained flash spun film material can be given excellent tensile strength, breaking strength, surface roughness. In contrast, as shown in comparative examples 1 to 3, in the case where behenate, erucamide and paraffin oil were not contained, the obtained flash-spun film was poor in tensile strength, breaking strength, surface roughness; as shown in comparative examples 4 to 6, in the case where the transport speed deviates from the scope of the present application, tensile strength, breaking strength, surface roughness are poor; as shown in comparative examples 7 to 9, in the case where the line pressure deviates from the scope of the present application, the obtained flash spun film material has poor tensile strength, breaking strength, surface roughness; as shown in comparative examples 10 to 12, in the case where the heating temperature of the embossing roll deviates from the scope of the present application, the obtained flash-spun film material is poor in tensile strength, breaking strength, surface roughness.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The manufacturing method of the flash spinning film material is characterized by comprising the following steps of:
(1) A spinning step in which a spinning solution is discharged from a nozzle at high temperature and high pressure, a solvent in the spinning solution is evaporated, and a polymer solute in the spinning solution is cooled and solidified into a continuous filament bundle, wherein the spinning solution contains polyethylene, a toughness improver and a spinning solvent, and the spinning solvent is chloroform;
The toughness improver comprises the following components in parts by weight: 2-6 parts of simethicone, 1-5 parts of behenic acid behenester, 1-5 parts of erucamide, 0.2-0.6 part of guar gum, 0.3-0.7 part of acetic acid, 1-5 parts of diethylene glycol monomethyl ether and 60 parts of deionized water;
The toughness modifier is prepared by mixing ① deionized water, acetic acid and guar gum, heating to 45 ℃, and standing for later use; ② Mixing simethicone, behenate and erucamide, heating to 45 ℃, mixing with the product obtained in the step ①, stirring for 30 minutes, and standing for 30 minutes; ③ Cooling the product obtained in the step ② to 35 ℃, mixing with diethylene glycol monomethyl ether, and stirring for 20 minutes to obtain a toughness improver;
(2) A lapping process in which continuous filament bundles are evenly laid on a lapping unit on a conveyor belt that runs under the condition of blowing by a blower;
(3) A forming process, wherein a web forming area is conveyed to an embossing roller through a conveyor belt for hot pressing to obtain a polyethylene flash spinning film, the conveying speed of the conveyor belt is 5 cm/s-20 cm/s, the linear pressure of the embossing roller is 100-550N/cm, and the heating temperature of the embossing roller is 60-110 ℃;
The embossing roller is formed by a convex roller and a concave roller, a plurality of convex parts are arranged on the peripheral surface of the convex roller, a plurality of concave parts are arranged on the peripheral surface of the concave roller, the convex parts are meshed with the concave parts, the convex parts are uniformly arranged in the rotating shaft direction and the circumferential direction of the convex roller, and the concave parts are uniformly arranged in the rotating shaft direction and the circumferential direction of the concave roller.
2. The method for producing a flash-spun film according to claim 1, wherein the content of the toughness improver is 0.10 to 0.50 parts by mass per 100 parts by mass of the spinning solution.
3. The method for producing a flash-spun film according to claim 1 or 2, wherein the temperature of the spinning solution is 165 ℃ to 240 ℃.
4. The method of producing a flash-spun film according to claim 1 or 2, wherein the height of the convex portion from the peripheral surface of the convex roller to the apex of the convex portion is preferably 3 to 6mm, the distance between the convex portions adjacent in the rotation axis direction, that is, the pitch, is 0.5 to 10mm, and the distance between the convex portions adjacent in the circumferential direction, that is, the pitch, is 0.5 to 10mm.
5. The method of manufacturing a flash-spun film of claim 1 or 2, wherein the top surface of the protrusion has a shape of a circle, a polygon, an oval.
6. The method of producing a flash-spun film according to claim 1 or 2, wherein the depth of engagement between the convex portion and the concave portion is 1 to 5mm.
7. The method of producing a flash-spun film according to claim 1 or 2, wherein the number of the convex rolls is one or more, and the number of the concave rolls is one or more.
8. The method of producing a flash-spun film according to claim 1 or 2, wherein the polyethylene flash-spun film has a thickness of 0.1mm to 0.3mm.
9. The method of producing a flash-spun film according to claim 1 or 2, wherein the polyethylene flash-spun film has a weight per unit area of more than 60g/m 2.
10. A flash-spun film material produced by the method for producing a flash-spun film material according to any one of claims 1 to 9.
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