CN103802424A - Polyethylene strong cross laminated composite film and production process thereof - Google Patents
Polyethylene strong cross laminated composite film and production process thereof Download PDFInfo
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Abstract
The invention discloses a production process of polyethylene strong cross laminated composite film. The production process is characterized by comprising the following steps: A, placing materials of an outer layer, a middle layer and an inner layer in a three-layer co-extrusion film blowing machine in formula proportion to perform co-extrusion film blowing so as to form a first blowing tube film with the thickness of 0.12-0.18 mm; B, performing secondary heating stretching on the first blowing tube film on a stretcher to form a second blowing tube film with the thickness of 0.04-0.06 mm; C, spirally slitting the second blowing tube film stretched twice, and beveling at the angle of 40-50 DEG C to obtain sheet films; and D, crossing and compounding. The production process has the advantages that the produced film is high in stretching strength, good in heat resistance, basically consistent in transverse and longitudinal strength and extension, and free of the phenomena of empty drum, water-expelling and leaking.
Description
Technical field
The present invention relates to the powerful crossed composite membrane manufacture field of polyethylene, relate in particular to the powerful crossed composite membrane of a kind of polyethylene and production technology thereof.
Background technology
Waterproof roll manufacturing enterprise produces the powerful mode of intersecting film waterproof roll of polyethylene both at home and abroad larger difference.External waterproof roll manufacturing enterprise first exceedes the modified pitch self-adhesive blade coating of high temperature on 170 degree high temperature PET barrier films can tolerate, then be covered with the powerful film that intersects of polyethylene through supercooling, such asynchronous method mode of production does not have resistant to elevated temperatures service condition to the powerful film that intersects of polyethylene again.And domestic waterproof roll manufacturing enterprise mostly adopts barrier film and the powerful film same footwork mode of production of overlay film simultaneously of intersecting of polyethylene, the powerful film that intersects of polyethylene needs directly contact 150 to spend the modified pitch self-adhesive of above high temperature.Therefore the powerful heat-resisting quantity of intersecting film of polyethylene is had relatively high expectations.
Common HDPE film inflation for once in process of production, ubiquity longitudinal tensile strength is greater than laterally, and laterally extending rate is greater than longitudinally, i.e. anisotropy.Complete waterproof construction at waterproof roll, through the heat of Exposure to Sunlight on daytime rise and the shrinkage of night cooling after, face can produce a large amount of deformational stresses, and due to anisotropy, longitudinally ability of anti-deformation is strong, laterally a little less than ability of anti-deformation, cause the vertical transverse deformation of face inconsistent, produce a large amount of folds, even hollowing, waterproof roll is departed from from formation level, cause channeling water, leak.
Summary of the invention
The object of the present invention is to provide the powerful crossed composite membrane of polyethylene that a kind of heat-resisting quantity is good.
For achieving the above object, technical scheme of the present invention is as follows: the powerful crossed composite membrane of a kind of polyethylene, it is characterized in that described composite membrane is made up of skin, middle level and internal layer, in weight ratio, described outer field formula is: HDPE:LDPE:LLDPE:TPE: look mother: antioxidant: MDPE=100:4.5 ~ 5.5:5 ~ 6:10 ~ 15:3 ~ 4:0.8 ~ 1:26 ~ 29; The formula in middle level is: HDPE:LDPE:TPE: look mother: antioxidant: MDPE=100:13 ~ 16:10 ~ 15:2.5 ~ 3:1 ~ 1.3:15 ~ 19; The formula of internal layer is HDPE:LDPE:EVA: look mother: antioxidant: MDPE=100:4 ~ 5:20 ~ 15:8 ~ 10:2 ~ 3:20 ~ 24.Wherein HDPE is high density polyethylene (HDPE), and LDPE is low density polyethylene (LDPE), and LLDPE is LLDPE, and MDPE is medium density polyethylene.Antioxidant is Hinered phenols, and EVA is ethane-acetic acid ethyenyl (vinyl acetate) ester copolymer.Look female is take low density polyethylene (LDPE) as carrier master batch, and outer black agglomerate, the middle level of adopting adopts white master batch, and internal layer adopts green master batch.
Another object of the present invention is to provide the production technology of the powerful crossed composite membrane of a kind of polyethylene, the powerful crossed composite membrane hot strength of polyethylene and the ability of anti-deformation of production are good.
To achieve these goals, technical scheme of the present invention is as follows: the production technology of the powerful crossed composite membrane of a kind of polyethylene, it is characterized in that described production technology comprises the following steps: the material of A, skin, middle level and internal layer is put into three-layer co-extruded inflation film manufacturing machine coextrusion film blowing, form first and blow a film, the first thickness that blows a film is 0.12～0.18mm; B, on stretching-machine, described the first blown film is carried out to post bake stretching, form second and blow a film, the second thickness that blows a film is 0.04～0.06mm; C, by second blowing a film and carry out spiral cutting after succeeding stretch, with the angles of 30 ~ 60 degree film in blocks of cutting sth. askew; D, intersect compound.
The present invention utilizes post bake drawing process and multiple film hot composition process, can effectively reduce the thickness of film and significantly improve hot strength, and common HDPE film is 0.14 ~ 0.16mm, and pulling force is 150N ~ 200N/50mm, and hot strength is 25 ~ 30MPa; And the thickness of the powerful crossed composite membrane of polyethylene of the present invention is only 0.08 ~ 0.12mm, pulling force can reach 350 N/50mm, and hot strength can be made a call to 50 ~ 65MPa.Non-deformability, considerably beyond common HDPE film, under same external condition impact, needs a very large power just can make it produce distortion.After tested, contrast Wei Luolang strong, thin films, affected by same pulling force, during as 135N/25mm, the displacement of the powerful crossed composite membrane of polyethylene of the present invention is approximately 30mm, and percentage elongation is about 60%, and the displacement of Wei Luolang strong, thin films is approximately 200mm, percentage elongation is about 400%, so the non-deformability of the powerful crossed composite membrane of polyethylene of the present invention is better than Wei Luolang strong, thin films.The present invention adopts the angle spirals of 40 ~ 50 degree to cut sth. askew and intersects the mode of laminating production, its transverse and longitudinal intensity, extend basically identical, i.e. isotropic.The vertical transverse deformation of face is basically identical, avoids occurring hollowing, channeling water, the phenomenon of leaking.Therefore, the invention has the advantages that the film hot strength of production is high, heat resistance is good, its transverse and longitudinal intensity, extends basically identically, avoids occurring hollowing, channeling water, the phenomenon of leaking.
Accompanying drawing explanation
Fig. 1 is spiral cutting schematic diagram in the present invention.
The specific embodiment
The production technology of the powerful crossed composite membrane of a kind of polyethylene, it is characterized in that described production technology comprises the following steps: A, by formula rate, the material of above-mentioned skin, middle level and internal layer is put into three-layer co-extruded inflation film manufacturing machine coextrusion film blowing, form first and blow a film, the first thickness that blows a film is 0.12 ~ 0.18mm; B, on stretching-machine, described the first blown film is carried out to post bake stretching, form second and blow a film, the second thickness that blows a film is 0.04 ~ 0.06mm; C, by second blowing a film and carry out spiral cutting after succeeding stretch, with the angles of 30 ~ 60 degree film in blocks of cutting sth. askew; D, intersect compound.
Wherein intersect compound can being undertaken by following three kinds of methods.The first, by the compound intersection membrane structure of patent 201220535891.7(heat), film crossing two-layer above-mentioned C orientation is carried out to heat compound; The film one side of the second, two-layer above-mentioned C orientation being intersected coats or aqueous acrylamide ester gum is coated on two sides, carries out pressing after predrying, then carry out slaking at the temperature of 40-50 degree; Three, after spiro rod plasticizing, become line style to extrude by flat-mould head die orifice hp-ldpe, after stretching, be attached to spiral cutting sheet film surface, by a slice stretched film and apply the stretched film of low density polyethylene (LDPE) and make it be along draw direction that to intersect each other situation moment under cooling press bonding roller effect cold formed compound.Cross angle 60 ~ 120 degree between the compound two membranes of described intersection.Adopt the first hot complex method, its advantage is to fuse into one mutually, can layering, and fastness is high, and leftover pieces reclaim well; But because there being hot sealing layer, other two kinds lower relatively of intensity; Adopt the second aqueous acrylamide ester gum complex method, its advantage is environmental protection, but compound fastness is hotter compound compound lower with film, and will dry through longer drying tunnel, also slaking again, and the production cycle is long, and output is relatively low; Adopt the third complex method, fastness is moderate, and speed of production is fast, and leftover pieces also reclaim well, and overall appearance is good, and laterally thickness uniformity does not have compound good of water-base cement.
According to a preferred embodiment of the invention, described composite membrane is made up of skin, middle level and internal layer, in weight ratio, described outer field formula is: HDPE:LDPE:LLDPE:TPE: look mother: antioxidant: MDPE=100:4.5 ~ 5.5:5 ~ 6:10 ~ 15:3 ~ 4:0.8 ~ 1:26 ~ 29; The formula in middle level is: HDPE:LDPE:TPE: look mother: antioxidant: MDPE=100:13 ~ 16:10 ~ 15:2.5 ~ 3:1 ~ 1.3:15 ~ 19; The formula of internal layer is HDPE:LDPE:EVA: look mother: antioxidant: MDPE=100:4 ~ 5:15 ~ 20:8 ~ 10:2 ~ 3:20 ~ 24.Wherein HDPE is high density polyethylene (HDPE), and LDPE is low density polyethylene (LDPE), and LLDPE is LLDPE, and MDPE is medium density polyethylene.Antioxidant is hindered phenol anti-oxidants (as adopted hydroquinones antioxidant, model is AY-03), and EVA is ethane-acetic acid ethyenyl (vinyl acetate) ester copolymer.Look female to be added paint to make for take low density polyethylene (LDPE) as carrier master batch, and its ectomesoderm adopts black agglomerate, middle level to adopt white master batch, and internal layer adopts green master batch.
The three-layer co-extruded blown film technology of the present invention, has given independently physical characteristic of three layers of films of cylinder, allows skin have good heatproof and thinks and longitudinal strength, heavily to pack HDPE as main, adds look mother; Allow middle level there is preferably laterally inflation type, make it to be difficult for holes gas leakage in succeeding stretch process, take metallocene as main, and add white master batch that certain covering power of setting off by contrast is provided; Allow nexine there is good cohesive and longitudinal strength, take bimodal HDPE as main, take LLDPE, EVA as auxiliary, then add look mother.Elastomer and TPE add, and have increased the toughness of film, after stretching, while cutting, so easily do not collapse out, but addition is too much unsuitable, otherwise pre-heat-shrinkable strengthen.
According to the first embodiment of the present invention, in weight ratio, described outer field formula is: HDPE:LDPE:LLDPE:TPE: black agglomerate: antioxidant: MDPE=100:4.5:5:10:3:0.8:26; The formula in middle level is: HDPE:LDPE:TPE: white master batch: antioxidant: MDPE=100:13:10:2.5:1:15; The formula of internal layer is HDPE:LDPE:EVA: green master batch: antioxidant: MDPE=100:4:20:8:2:20.
According to a second embodiment of the present invention, in weight ratio, described outer field formula is: HDPE:LDPE:LLDPE:TPE: black agglomerate: antioxidant: MDPE=100:5.5:6:15:4:1:29; The formula in middle level is: HDPE:LDPE:TPE: white master batch: antioxidant: MDPE=100:16:15:3:1.3:19; The formula of internal layer is HDPE:LDPE:EVA: green master batch: antioxidant: MDPE=100:5:15:10:3:24.
A third embodiment in accordance with the invention, in weight ratio, described outer field formula is: HDPE:LDPE:LLDPE:TPE: black agglomerate: antioxidant: MDPE=100:5:5.5:12:3.5:0.9:27; The formula in middle level is: HDPE:LDPE:TPE: white master batch: antioxidant: MDPE=100:15:12:2.8:1.2:17; The formula of internal layer is HDPE:LDPE:EVA: green master batch: antioxidant: MDPE=100:4.5:18:9:2.5:22.
Blow a film by second and carry out after the stretching of secondary inflation, extending longitudinally being removed before yield limit, thus reach the percentage elongation that reduces the powerful crossed composite membrane of final polyethylene, make it be difficult for producing the object of deformation; Thickness is stretched to 1/3rd of former cylinder film, and after molecularly oriented, longitudinal tensile strength has improved approximately 3 times.Control the degree stretching well, i.e. draw ratio, just becomes the key of secondary inflation drawing process.If draw ratio is too low, thickness is partially thick, and hot strength is on the low side, and percentage elongation is higher; If draw ratio is too high, cylinder film is stretched to and exceedes yield limit, molecularly oriented is excessive, can cause that the rate extending longitudinally of film is on the low side, even cannot carry out next process.
In the present invention, utilizing heating and traction, speed ratio is poor that cylinder film is carried out to succeeding stretch, and the setting of temperature and traction speed ratio is just called the key problem in technology point of succeeding stretch technique.In the present invention, utilizing heating and traction, speed ratio is poor that cylinder film is carried out to succeeding stretch, and the setting of temperature and traction speed ratio is just called the key problem in technology point of succeeding stretch technique.In succeeding stretch technique, after the heating of preheating zone, the thermal treatment zone, stretch at drawing zone, then successively through cooling zone, refined zone and air-cooled district cooling.Cylinder film is arranged between drive roll and driven roll, adopts the poor drawing effect of realizing a film of hauling speed between drive roll and driven roll, the roll surface speed that wherein the first hauling speed is drive roll, the roll surface speed that the second hauling speed is driven roll.
According to a preferred embodiment of the invention, in described succeeding stretch technique, for black cylinder film, preheating zone temperature is 285 degree, and Heating Zone Temperature is 340 degree, and drawing zone temperature is 350 degree, cooling zone temperature is 180 degree, and refined zone temperature is 240 degree, and air-cooled district temperature is 40 degree; For green cylinder film, preheating zone temperature is 305 degree, and Heating Zone Temperature is 350 degree, and drawing zone temperature is 373 degree, and cooling zone temperature is 190 degree, and refined zone temperature is 230 degree, and air-cooled district temperature is 40 degree; For black cylinder film, the traction speed ratio of the first hauling speed and the second hauling speed is 4.2 the bests, and for green cylinder film, and the traction speed ratio of the first hauling speed and the second hauling speed is 4.17 for best.
By second blowing a film and carry out spiral cutting after succeeding stretch, cut sth. askew and be SD sheet film with the angle of 45 degree, the stretching force of SD sheet film, percentage elongation are reached unanimity on transverse and longitudinal.As shown be spiral cutting schematic diagram.As shown in the figure, described cylinder film 2 is wound in a rotating shaft 1, described rotating shaft 1 can horizontally rotate and vertical rotary simultaneously, the subdivision end of described cylinder film 2 is enclosed within outside a subdivision sizing cylinder 5, the external diameter of subdivision sizing cylinder 5 is slightly less than the diameter of a film, cylinder film was through the cylinder of subdivision sizing cylinder 3 o'clock, tube head supports into tubular, cut-off knife is along a miter angle degree direction film of cutting sth. askew, horizontally rotating of rotating shaft 1 makes to discharge cylinder film, vertical rotary makes a film follow the rotation of subdivision sizing cylinder, so that cut-off knife carries out spiral cutting, forms oblique section film 6.Can not complete stability due to the diameter of cylinder film, so require subdivision sizing cylinder to possess certain adaptivity, in the time that cylinder film is bigger than normal, it is large that cylinder head also becomes thereupon, to strut a film completely, gives a film certain tension force, prevents that the angle of cutting is unstable or cut uneven; In the time that cylinder film is less than normal, cylinder head is also corresponding to diminish thereupon, prevents from bursting a film.A spiral cutting machine for a patent 201220536317.3(variable oval center of circle focal length of applicant's previous application is specifically shown in by the subdivision sizing cylinder of this reducing ellipse) and the device of 201220535860.1(multiple films of can simultaneously cutting sth. askew).
Above content is in conjunction with concrete preferred embodiment further description made for the present invention, can not assert that the concrete enforcement of the present invention is confined to above-mentioned these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (3)
1. the production technology of the powerful crossed composite membrane of polyethylene, it is characterized in that described production technology comprises the following steps: A, the material of outer, middle level and internal layer is put into three-layer co-extruded inflation film manufacturing machine coextrusion film blowing, form first and blow a film, the first thickness that blows a film is 0.12 ~ 0.18mm; B, on stretching-machine, described the first blown film is carried out to post bake stretching, form second and blow a film, the second thickness that blows a film is 0.04 ~ 0.06mm; C, by second blowing a film and carry out spiral cutting after succeeding stretch, with the angles of 40 ~ 50 degree film in blocks of cutting sth. askew; D, intersect compound.
2. the powerful crossed composite membrane of polyethylene, it is characterized in that described composite membrane is made up of skin, middle level and internal layer, by weight percentage, described outer field formula is: HDPE:LDPE:LLDPE:TPE: look mother: antioxidant: MDPE=100:4.5 ~ 5.5:5 ~ 6:10 ~ 15:3 ~ 4:0.8 ~ 1:26 ~ 29; The formula in middle level is: HDPE:LDPE:TPE: look mother: antioxidant: MDPE=100:13 ~ 16:10 ~ 15:2.5 ~ 3:1 ~ 1.3:15 ~ 19; The formula of internal layer is HDPE:LDPE:EVA: look mother: antioxidant: MDPE=100:4 ~ 5:20 ~ 15:8 ~ 10:2 ~ 3:20 ~ 24.
3. the powerful crossed composite membrane of polyethylene as claimed in claim 1, is characterized in that antioxidant adopts hindered phenol anti-oxidants.
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| CN105150565A (en) * | 2015-07-07 | 2015-12-16 | 浙江新高包装有限公司 | High-density polyethylene (HDPE) composite packing film |
| CN105644091A (en) * | 2015-12-29 | 2016-06-08 | 秦皇岛市地维建材有限公司 | Preparation method of TPO crossed compound sheet self-adhesion waterproof coiled material |
| CN109016716A (en) * | 2018-08-16 | 2018-12-18 | 江苏优珀斯材料科技有限公司 | High-barrier strength intersects film |
| CN112208114A (en) * | 2020-09-14 | 2021-01-12 | 与时高分子科技(湖北)有限公司 | Preparation method of high-density polyethylene cross membrane |
| CN114083856A (en) * | 2021-12-07 | 2022-02-25 | 江门市华龙膜材股份有限公司 | High-temperature-resistant self-adhesive pure polyethylene protective film and preparation method thereof |
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| CN104859948A (en) * | 2015-06-12 | 2015-08-26 | 成都市益诚包装有限公司 | High impact force-resistant polyethylene heat shrink film and film blowing process |
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| CN114083856A (en) * | 2021-12-07 | 2022-02-25 | 江门市华龙膜材股份有限公司 | High-temperature-resistant self-adhesive pure polyethylene protective film and preparation method thereof |
| CN114083856B (en) * | 2021-12-07 | 2023-08-11 | 江门市华龙膜材股份有限公司 | High-temperature-resistant self-adhesive pure polyethylene protective film and preparation method thereof |
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Effective date of registration: 20201201 Address after: Room 301, office building, electronic information industrial park, shigaitang Industrial Park, Beihu District, Chenzhou City, Hunan Province Patentee after: Hunan youperth New Material Technology Co.,Ltd. Address before: Huaxin Town, Shanghai city Qingpu District Jiasong road 201708 Lane 1299 No. 88 building second Patentee before: UPASS MATERIAL TECHNOLOGY (SHANGHAI) Co.,Ltd. |