CN118144387A - Low-static extinction film product and preparation method thereof - Google Patents
Low-static extinction film product and preparation method thereof Download PDFInfo
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- CN118144387A CN118144387A CN202410200044.2A CN202410200044A CN118144387A CN 118144387 A CN118144387 A CN 118144387A CN 202410200044 A CN202410200044 A CN 202410200044A CN 118144387 A CN118144387 A CN 118144387A
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- film
- stretching
- surface layer
- polypropylene
- extinction
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- 230000008033 biological extinction Effects 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000002344 surface layer Substances 0.000 claims abstract description 44
- 238000001816 cooling Methods 0.000 claims abstract description 33
- 239000004743 Polypropylene Substances 0.000 claims abstract description 29
- -1 polypropylene Polymers 0.000 claims abstract description 29
- 229920001155 polypropylene Polymers 0.000 claims abstract description 29
- 239000012792 core layer Substances 0.000 claims abstract description 23
- 230000003068 static effect Effects 0.000 claims abstract description 23
- 239000002216 antistatic agent Substances 0.000 claims abstract description 14
- 238000003851 corona treatment Methods 0.000 claims abstract description 12
- 238000009998 heat setting Methods 0.000 claims abstract description 11
- 239000010410 layer Substances 0.000 claims abstract description 11
- 230000005012 migration Effects 0.000 claims abstract description 11
- 238000013508 migration Methods 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 10
- 238000010791 quenching Methods 0.000 claims abstract description 5
- 230000000171 quenching effect Effects 0.000 claims abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 4
- 238000001125 extrusion Methods 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 238000005096 rolling process Methods 0.000 claims description 10
- 239000006224 matting agent Substances 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 90
- 238000002425 crystallisation Methods 0.000 description 5
- 230000008025 crystallization Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000002421 anti-septic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000009791 electrochemical migration reaction Methods 0.000 description 1
- 125000001183 hydrocarbyl group Chemical group 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention relates to the technical field of films, and provides a low-static extinction film product, which comprises an extinction film body, wherein the extinction film body sequentially comprises an upper surface layer, a core layer and a lower surface layer from top to bottom, the upper surface layer and the lower surface layer are both made of extinction agents, the core layer is a main extrusion layer, and the core layer is made of polypropylene. The invention also provides a preparation method of the low-static extinction film product, which comprises the following steps: s1, chilling treatment: quenching the cast sheet by a chilled roll to extrude polypropylene into a film; s2, longitudinal stretching; s3, transversely stretching; s4, heat setting treatment; s5, cooling treatment; s6, pulling a cooling roller; s7, stretching and flattening; s8, corona treatment, namely corona treatment is carried out on the film by using a corona roller so as to activate the surface of the film; s9, film pulling and winding. The invention can reduce the static resistance of the upper surface layer to 10-9.5 omega; the lower surface layer and the core layer are not added with migration type antistatic agent, and the oxygen for breaking the polypropylene molecular chain forms a high static electrode group by strong corona treatment, so that an asymmetric static effect is achieved.
Description
Technical Field
The invention relates to a low-static extinction film product and a preparation method thereof, belonging to the technical field of films.
Background
The extinction film needs to be die-cut in the use process, a process of stacking is carried out on a die-cut finished product in the processing process, adhesion is not easy to separate due to electrostatic adsorption in the use process, and excessive static electricity needs to be prevented when the extinction film is partially used for packaging or labeling electronic products, so that electrostatic damage of the electronic products is caused; meanwhile, the film needs to be adsorbed by static electricity during the molding process, so that good molding effect and efficiency can be ensured. The utility model patent No. CN201710909526.5 discloses a biaxially oriented polyester extinction film and a preparation method thereof, the biaxially oriented polyester extinction film prepared by the method adopts a double-layer extinction structure, the prepared biaxially oriented polyester extinction film is uniform and fine, the haze is more than 80 percent, the biaxially oriented polyester extinction film can be suitable for manufacturing special high-grade labels of household appliances, computer precision instruments and equipment, and the like, and is a printing package of indoor matte decorative materials, high-grade cigarettes, wine and the like, and a film of high-grade books; the Chinese patent No. CN201320151402.2 discloses a corona extinction film with an antiseptic and antibacterial layer, which can solve the problems of high haze fluctuation and low yield of the existing corona extinction film
The inventors of the present patent found that the prior art had the following problems: some products require asymmetric electrostatic properties with large static electrodes and minimal static. The conventional antistatic agent is an ionic migration additive, and the migration amount and the migration speed of the antistatic agent to the two sides of the film after processing are equivalent, so that the effect of asymmetric static electricity cannot be achieved, and therefore, improvement is needed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a low-static extinction film product and a preparation method thereof, and the preparation method of the low-static extinction film product develops an asymmetric static double-matte extinction film aiming at market demands, so that an asymmetric static effect can be achieved.
The invention is realized by the following technical scheme.
The invention provides a low-static extinction film product, which comprises an extinction film body, wherein the extinction film body sequentially comprises an upper surface layer, a core layer and a lower surface layer from top to bottom, the upper surface layer and the lower surface layer are both made of extinction agents, the core layer is a main extrusion layer, the core layer is made of polypropylene, a non-migration type permanent antistatic agent is added to the upper surface layer, and the core layer and the lower surface layer are obtained through corona treatment.
The thickness of the upper surface layer is 2.7-2.8 mu m, the thickness of the core layer is 44.5 mu m, and the thickness of the lower surface layer is 2.7-2.8 mu m.
The weight ratio of the upper surface layer to the core layer to the lower surface layer is 100 parts of matting agent: 100 parts of polypropylene: 100 parts of matting agent, wherein 1.2 parts of antistatic agent is uniformly mixed with 100 parts of polypropylene; 20% of non-migration type permanent antistatic agent is added into the matting agent of the upper surface layer.
The longitudinal elastic modulus of the extinction film body is 1600Pa, the transverse elastic modulus is 3200Pa, the longitudinal tensile strength is 122Mpa, and the transverse tensile strength is 260Mpa.
The extinction film body has an inner friction coefficient of 0.23/0.21, an outer friction coefficient of 0.24/0.2, a longitudinal thermal shrinkage of 3.0%, a transverse thermal shrinkage of 0.5%, a haze of 93.1%, a glossiness of 4.8gu, a longitudinal fracture nominal strain of 180 and a transverse fracture nominal strain of 53.
The invention also provides a preparation method of the low-static extinction film product, which is used for preparing the low-static extinction film product and comprises the following steps of:
S1, chilling treatment: quenching the cast sheet by a chilled roll to extrude polypropylene into a film;
s2, longitudinal stretching: softening and stretching the polypropylene film by using a preheating roller and a stretching roller in sequence, wherein the temperature of the stretching roller is lower than that of the preheating roller;
s3, transversely stretching: transversely stretching the film-formed polypropylene at a stretching temperature at least 10 ℃ higher than the stretching temperature in step S2;
S4, heat setting treatment: performing heat setting treatment on the film-formed polypropylene at a temperature of not higher than 167 ℃;
S5, cooling treatment: cooling the film-formed polypropylene to a film at a temperature of not more than 60 ℃;
s6, drawing a cooling roller: pulling the cooling roller to enable the cooling roller to travel along the surface of the film so as to reduce the surface temperature of the film;
S7, stretching and flattening: adjusting the tensile stress to eliminate longitudinal stripes of the film;
s8, corona treatment: corona treating the film with a corona roller to activate the film surface;
S9, film drawing and rolling: and (3) taking out the film by using a film drawing machine and rolling, wherein a speed difference exists between the speed of the film drawing machine and the linear speed of the surface of the winding core, and the surface of the winding core is pressed down in the rolling process to remove air.
The transverse stretching temperature in the step S3 is 15-25 ℃ higher than the stretching temperature in the step S2.
In the step S4, the heat setting treatment is carried out at 145-165 ℃ for 3-6 seconds.
In the step S5, the cooling residence time is 1 to 4 seconds.
In the step S6, the temperature of the drawn cooling roll is 30 ℃.
The invention has the beneficial effects that: the static resistance of the upper surface layer is reduced to 10-9.5 omega by adding 20% of non-migration type permanent antistatic agent to the upper surface layer; the lower surface layer and the core layer are not added with migration type antistatic agent, and the polypropylene molecular chain is subjected to strong corona treatment to form high static electrode groups by oxygen for breaking the polypropylene molecular chain, so that an asymmetric static effect is achieved.
Drawings
FIG. 1 is a flow chart of at least one embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the above.
The first embodiment of the invention relates to a low-static extinction film product shown in fig. 1, which comprises an extinction film body, wherein the extinction film body sequentially comprises an upper surface layer, a core layer and a lower surface layer from top to bottom, the upper surface layer and the lower surface layer are both made of extinction agents, the core layer is a main extrusion layer, the core layer is made of polypropylene, a non-migration type permanent antistatic agent is added to the upper surface layer, and the core layer and the lower surface layer are obtained through corona treatment. The upper surface layer is an auxiliary layer, the core layer is a main layer, the lower surface layer is an auxiliary two layers, and the three layers are in close contact connection.
The thickness of the upper surface layer is 2.7-2.8 mu m, the thickness of the core layer is 44.5 mu m, and the thickness of the lower surface layer is 2.7-2.8 mu m. In order to obtain a uniform roughened surface, the surface layer of the matting film must be maintained at a suitable thickness.
The weight ratio of the upper surface layer, the core layer and the lower surface layer is 100 parts of matting agent: 100 parts of polypropylene: 100 parts of matting agent, wherein 1.2 parts of antistatic agent is uniformly mixed with 100 parts of polypropylene; 20% of non-migration type permanent antistatic agent is added into the matting agent of the upper surface layer. Different kinds of films can be produced by different material proportions, and films with the same kind but different properties can be produced by the same material proportion.
The longitudinal elastic modulus of the extinction film body is 1600Pa, the transverse elastic modulus is 3200Pa, the longitudinal tensile strength is 122Mpa, and the transverse tensile strength is 260Mpa. The elastic modulus is a measure of the ability of an object to resist elastic deformation; tensile strength is an important measure of the durability and strength of a material.
The extinction film body has an inner friction coefficient of 0.23/0.21, an outer friction coefficient of 0.24/0.2, a longitudinal heat shrinkage of 3.0%, a transverse heat shrinkage of 0.5%, a haze of 93.1%, a glossiness of 4.8gu, a longitudinal fracture nominal strain of 180, and a transverse fracture nominal strain of 53. The haze, gloss and other performance indexes of the matt film are excellent when the heat shrinkage is low. The extinction curtain with the haze of more than 70 percent has the advantages of comfortable hand feeling, calm and elegant appearance and vivid printing color.
A second embodiment of the present invention relates to a method for preparing a low static electricity matting film product for preparing the first embodiment described above, comprising the steps of:
S1, chilling treatment: quenching the cast sheet by a chilled roll to extrude polypropylene into a film; the problem of different cooling speeds of the two sides can exist in the quenching process of the chilling roller, so that huge crystalline state difference and density difference can occur on the two sides; the sheet is also subject to warping, uneven cooling or preheating, so that stretching is difficult;
S2, longitudinal stretching: softening and stretching the polypropylene film by using a preheating roller and a stretching roller in sequence, wherein the temperature of the stretching roller is lower than that of the preheating roller; the greater the draw ratio, the greater the degree of molecular orientation of the film; the stretching ratio is too high, so that the probability of rupture of the film during transverse stretching of the film is increased; too low a draw ratio, in addition to affecting the mechanical properties of the film, can also give rise to increased longitudinal thickness tolerance fluctuations;
s3, transversely stretching: transversely stretching the film-formed polypropylene at a stretching temperature at least 10 ℃ higher than the stretching temperature in step S2; the temperature depends on the thickness of the raw materials and the products, and is also related to the stretching ratio and the stretching setting, and the preheating, stretching area and transverse heating temperature are uniform and stable;
S4, heat setting treatment: performing heat setting treatment on the film-formed polypropylene at a temperature of not higher than 167 ℃; the heat treatment accelerates the secondary crystallization or crystallization process of the polymer;
S5, cooling treatment: cooling the film-formed polypropylene to a film at a temperature of not more than 60 ℃; the cooling process mainly refers to cooling temperature, cooling time, cooling air purification and the like;
s6, drawing a cooling roller: pulling the cooling roller to enable the cooling roller to travel along the surface of the film so as to reduce the surface temperature of the film;
S7, stretching and flattening: adjusting the tensile stress to eliminate longitudinal stripes of the film; eliminating longitudinal stripes generated by the film before traction, thickness gauge, trimming, corona treatment and rolling under tensile stress;
S8, corona treatment: corona treating the film with a corona roller to activate the film surface; the high-energy electrons and ions bombard the surface of the film to break chain molecules on the surface of the film, free radicals generated during chain breaking react with corona products in the air in an oxidation and crosslinking way to enable corona on the surface of the film to generate polar groups, the surface of the film is activated, part of ions are implanted into the film to coarsen the surface, and the surface tension of the film is increased. The surface of the film after corona treatment becomes a polar substance completely different from the original hydrocarbon structure, and the free energy of the surface is greatly improved;
S9, film drawing and rolling: and (3) taking out the film by using a film drawing machine and rolling, wherein a speed difference exists between the speed of the film drawing machine and the linear speed of the surface of the winding core, and the surface of the winding core is pressed down in the rolling process to remove air. The tension is the force that tightens the film, and its magnitude depends on the difference between the linear speed of the winding core surface and the film-out speed of the film pulling machine. The pressure is essentially such that excess air trapped during the winding process is removed to maintain a proper space between the film layers so that the film has a shrink margin during the aging process. Too much pressure will cause the film to stick together and unfavorably slit with large, too little pressure, too much air is taken up by the film roll, and film roll unwinding and longitudinal streaking tend to occur.
The third embodiment of the present invention is substantially identical to the second embodiment, mainly consisting in a further optimization of the details of the steps. The transverse stretching temperature in the step S3 is 15-25 ℃ higher than the stretching temperature in the step S2. The temperature is too low, and the phenomena of clamping removal and membrane rupture easily occur in the production process. The film can have larger thickness fluctuation and increased haze when the temperature is too high, and can also have film rupture phenomenon when the film is serious. The temperature depends on the thickness of the raw material and the product, and also depends on the stretching ratio and the stretching setting. The stretching temperature of the thin film is lower than that of the thin film with a larger thickness, the stretching speed is high, and the stretching temperature is correspondingly increased. The temperature distribution of the stretching area is also important, the temperature of the preheating and stretching area is preheated, and the transverse heating temperature is required to be uniform and stable. The temperature of the stretch zone is typically increased by a number of increments.
In the step S4, the heat setting treatment is carried out at 145-165 ℃ for 3-6 seconds. The purposes of heat setting of different materials are different, and for crystalline polymers, the heat treatment accelerates the secondary crystallization or crystallization process of the polymer, so that the molecular chain orientation is converted into the crystallization orientation, the internal stress of the film is eliminated, the crystallinity is improved, the crystal structure tends to be perfect, and the heat shrinkage rate of the film is reduced.
In step S5, the cooling residence time is 1 to 4 seconds. Cooling is to prevent the film from accelerating creep at high temperatures, which would affect the film's performance. The thicker the thickness, the longer the film residence time. The film is forcedly cooled, and low molecular substances sublimated from the film are condensed, so that greasy dirt on a cooling section appears.
In step S6, the temperature of the drawn cooling roll is 30 ℃. The surface temperature of the film after the cooling stage is still 50 degrees or more, and if the film is wound on the winding core, the product may be deformed or stuck together, and the surface temperature of the film needs to be taken away by pulling each cooling roller.
Claims (10)
1. The low-static extinction film product comprises an extinction film body and is characterized in that the extinction film body sequentially comprises an upper surface layer, a core layer and a lower surface layer from top to bottom, wherein the upper surface layer and the lower surface layer are both made of extinction agents, the core layer is a main extrusion layer, the core layer is made of polypropylene, a non-migration type permanent antistatic agent is added to the upper surface layer, and the core layer and the lower surface layer are obtained through corona treatment.
2. A low static electricity matt film product according to claim 1, characterized in that: the thickness of the upper surface layer is 2.7-2.8 mu m, the thickness of the core layer is 44.5 mu m, and the thickness of the lower surface layer is 2.7-2.8 mu m.
3. A low static electricity matting film product according to claim 1 wherein the parts ratio of the upper, core and lower surface layers is 100 parts matting agent: 100 parts of polypropylene: 100 parts of matting agent, wherein 1.2 parts of antistatic agent is uniformly mixed with 100 parts of polypropylene; 20% of non-migration type permanent antistatic agent is added into the matting agent of the upper surface layer.
4. A low static electricity matted film product according to claim 1, wherein said matted film body has a longitudinal elastic modulus of 1600Pa, a transverse elastic modulus of 3200Pa, a longitudinal tensile strength of 122Mpa and a transverse tensile strength of 260Mpa.
5. A low static electricity matt film product according to claim 1, wherein said matt film body has an internal coefficient of friction of 0.23/0.21, an external coefficient of friction of 0.24/0.2, a machine direction heat shrinkage of 3.0%, a transverse direction heat shrinkage of 0.5%, a haze of 93.1%, a gloss of 4.8gu, a machine direction fracture nominal strain of 180, and a transverse direction fracture nominal strain of 53.
6. A process for preparing a low static electricity matting film product as defined in any one of claims 1 to 5 comprising the steps of:
S1, chilling treatment: quenching the cast sheet by a chilled roll to extrude polypropylene into a film;
s2, longitudinal stretching: softening and stretching the polypropylene film by using a preheating roller and a stretching roller in sequence, wherein the temperature of the stretching roller is lower than that of the preheating roller;
s3, transversely stretching: transversely stretching the film-formed polypropylene at a stretching temperature at least 10 ℃ higher than the stretching temperature in step S2;
S4, heat setting treatment: performing heat setting treatment on the film-formed polypropylene at a temperature of not higher than 167 ℃;
S5, cooling treatment: cooling the film-formed polypropylene to a film at a temperature of not more than 60 ℃;
s6, drawing a cooling roller: pulling the cooling roller to enable the cooling roller to travel along the surface of the film so as to reduce the surface temperature of the film;
S7, stretching and flattening: adjusting the tensile stress to eliminate longitudinal stripes of the film;
s8, corona treatment: corona treating the film with a corona roller to activate the film surface;
S9, film drawing and rolling: and (3) taking out the film by using a film drawing machine and rolling, wherein a speed difference exists between the speed of the film drawing machine and the linear speed of the surface of the winding core, and the surface of the winding core is pressed down in the rolling process to remove air.
7. A method of producing a low static electricity matted film product according to claim 6, wherein the transverse stretching temperature in step S3 is 15 to 25 ℃ higher than the stretching temperature in step S2.
8. The method for producing a low static electricity matting film according to claim 6 characterized in that in step S4, the heat setting treatment is carried out at 145 to 165 ℃ for 3 to 6 seconds.
9. A method for producing a low static electricity matting film product according to claim 6 characterised in that in step S5 the cooling residence time is in the range 1 to 4 seconds.
10. A method for producing a low static electricity matting film product according to claim 6 characterised in that in step S6 the temperature of the drawing cooling roller is 30 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410200044.2A CN118144387A (en) | 2024-02-23 | 2024-02-23 | Low-static extinction film product and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410200044.2A CN118144387A (en) | 2024-02-23 | 2024-02-23 | Low-static extinction film product and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN118144387A true CN118144387A (en) | 2024-06-07 |
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ID=91291161
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410200044.2A Pending CN118144387A (en) | 2024-02-23 | 2024-02-23 | Low-static extinction film product and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118144387A (en) |
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- 2024-02-23 CN CN202410200044.2A patent/CN118144387A/en active Pending
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